View.java revision 4380f9542fcb4a452332ecbea6a2036a2b159ab3
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)} or {@link #setPaddingRelative(int, int, int, int)} 344 * method and queried by calling {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 345 * {@link #getPaddingRight()}, {@link #getPaddingBottom()}, {@link #getPaddingStart()}, 346 * {@link #getPaddingEnd()}. 347 * </p> 348 * 349 * <p> 350 * Even though a view can define a padding, it does not provide any support for 351 * margins. However, view groups provide such a support. Refer to 352 * {@link android.view.ViewGroup} and 353 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 354 * </p> 355 * 356 * <a name="Layout"></a> 357 * <h3>Layout</h3> 358 * <p> 359 * Layout is a two pass process: a measure pass and a layout pass. The measuring 360 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 361 * of the view tree. Each view pushes dimension specifications down the tree 362 * during the recursion. At the end of the measure pass, every view has stored 363 * its measurements. The second pass happens in 364 * {@link #layout(int,int,int,int)} and is also top-down. During 365 * this pass each parent is responsible for positioning all of its children 366 * using the sizes computed in the measure pass. 367 * </p> 368 * 369 * <p> 370 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 371 * {@link #getMeasuredHeight()} values must be set, along with those for all of 372 * that view's descendants. A view's measured width and measured height values 373 * must respect the constraints imposed by the view's parents. This guarantees 374 * that at the end of the measure pass, all parents accept all of their 375 * children's measurements. A parent view may call measure() more than once on 376 * its children. For example, the parent may measure each child once with 377 * unspecified dimensions to find out how big they want to be, then call 378 * measure() on them again with actual numbers if the sum of all the children's 379 * unconstrained sizes is too big or too small. 380 * </p> 381 * 382 * <p> 383 * The measure pass uses two classes to communicate dimensions. The 384 * {@link MeasureSpec} class is used by views to tell their parents how they 385 * want to be measured and positioned. The base LayoutParams class just 386 * describes how big the view wants to be for both width and height. For each 387 * dimension, it can specify one of: 388 * <ul> 389 * <li> an exact number 390 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 391 * (minus padding) 392 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 393 * enclose its content (plus padding). 394 * </ul> 395 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 396 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 397 * an X and Y value. 398 * </p> 399 * 400 * <p> 401 * MeasureSpecs are used to push requirements down the tree from parent to 402 * child. A MeasureSpec can be in one of three modes: 403 * <ul> 404 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 405 * of a child view. For example, a LinearLayout may call measure() on its child 406 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 407 * tall the child view wants to be given a width of 240 pixels. 408 * <li>EXACTLY: This is used by the parent to impose an exact size on the 409 * child. The child must use this size, and guarantee that all of its 410 * descendants will fit within this size. 411 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 412 * child. The child must gurantee that it and all of its descendants will fit 413 * within this size. 414 * </ul> 415 * </p> 416 * 417 * <p> 418 * To intiate a layout, call {@link #requestLayout}. This method is typically 419 * called by a view on itself when it believes that is can no longer fit within 420 * its current bounds. 421 * </p> 422 * 423 * <a name="Drawing"></a> 424 * <h3>Drawing</h3> 425 * <p> 426 * Drawing is handled by walking the tree and rendering each view that 427 * intersects the invalid region. Because the tree is traversed in-order, 428 * this means that parents will draw before (i.e., behind) their children, with 429 * siblings drawn in the order they appear in the tree. 430 * If you set a background drawable for a View, then the View will draw it for you 431 * before calling back to its <code>onDraw()</code> method. 432 * </p> 433 * 434 * <p> 435 * Note that the framework will not draw views that are not in the invalid region. 436 * </p> 437 * 438 * <p> 439 * To force a view to draw, call {@link #invalidate()}. 440 * </p> 441 * 442 * <a name="EventHandlingThreading"></a> 443 * <h3>Event Handling and Threading</h3> 444 * <p> 445 * The basic cycle of a view is as follows: 446 * <ol> 447 * <li>An event comes in and is dispatched to the appropriate view. The view 448 * handles the event and notifies any listeners.</li> 449 * <li>If in the course of processing the event, the view's bounds may need 450 * to be changed, the view will call {@link #requestLayout()}.</li> 451 * <li>Similarly, if in the course of processing the event the view's appearance 452 * may need to be changed, the view will call {@link #invalidate()}.</li> 453 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 454 * the framework will take care of measuring, laying out, and drawing the tree 455 * as appropriate.</li> 456 * </ol> 457 * </p> 458 * 459 * <p><em>Note: The entire view tree is single threaded. You must always be on 460 * the UI thread when calling any method on any view.</em> 461 * If you are doing work on other threads and want to update the state of a view 462 * from that thread, you should use a {@link Handler}. 463 * </p> 464 * 465 * <a name="FocusHandling"></a> 466 * <h3>Focus Handling</h3> 467 * <p> 468 * The framework will handle routine focus movement in response to user input. 469 * This includes changing the focus as views are removed or hidden, or as new 470 * views become available. Views indicate their willingness to take focus 471 * through the {@link #isFocusable} method. To change whether a view can take 472 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 473 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 474 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 475 * </p> 476 * <p> 477 * Focus movement is based on an algorithm which finds the nearest neighbor in a 478 * given direction. In rare cases, the default algorithm may not match the 479 * intended behavior of the developer. In these situations, you can provide 480 * explicit overrides by using these XML attributes in the layout file: 481 * <pre> 482 * nextFocusDown 483 * nextFocusLeft 484 * nextFocusRight 485 * nextFocusUp 486 * </pre> 487 * </p> 488 * 489 * 490 * <p> 491 * To get a particular view to take focus, call {@link #requestFocus()}. 492 * </p> 493 * 494 * <a name="TouchMode"></a> 495 * <h3>Touch Mode</h3> 496 * <p> 497 * When a user is navigating a user interface via directional keys such as a D-pad, it is 498 * necessary to give focus to actionable items such as buttons so the user can see 499 * what will take input. If the device has touch capabilities, however, and the user 500 * begins interacting with the interface by touching it, it is no longer necessary to 501 * always highlight, or give focus to, a particular view. This motivates a mode 502 * for interaction named 'touch mode'. 503 * </p> 504 * <p> 505 * For a touch capable device, once the user touches the screen, the device 506 * will enter touch mode. From this point onward, only views for which 507 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 508 * Other views that are touchable, like buttons, will not take focus when touched; they will 509 * only fire the on click listeners. 510 * </p> 511 * <p> 512 * Any time a user hits a directional key, such as a D-pad direction, the view device will 513 * exit touch mode, and find a view to take focus, so that the user may resume interacting 514 * with the user interface without touching the screen again. 515 * </p> 516 * <p> 517 * The touch mode state is maintained across {@link android.app.Activity}s. Call 518 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 519 * </p> 520 * 521 * <a name="Scrolling"></a> 522 * <h3>Scrolling</h3> 523 * <p> 524 * The framework provides basic support for views that wish to internally 525 * scroll their content. This includes keeping track of the X and Y scroll 526 * offset as well as mechanisms for drawing scrollbars. See 527 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 528 * {@link #awakenScrollBars()} for more details. 529 * </p> 530 * 531 * <a name="Tags"></a> 532 * <h3>Tags</h3> 533 * <p> 534 * Unlike IDs, tags are not used to identify views. Tags are essentially an 535 * extra piece of information that can be associated with a view. They are most 536 * often used as a convenience to store data related to views in the views 537 * themselves rather than by putting them in a separate structure. 538 * </p> 539 * 540 * <a name="Properties"></a> 541 * <h3>Properties</h3> 542 * <p> 543 * The View class exposes an {@link #ALPHA} property, as well as several transform-related 544 * properties, such as {@link #TRANSLATION_X} and {@link #TRANSLATION_Y}. These properties are 545 * available both in the {@link Property} form as well as in similarly-named setter/getter 546 * methods (such as {@link #setAlpha(float)} for {@link #ALPHA}). These properties can 547 * be used to set persistent state associated with these rendering-related properties on the view. 548 * The properties and methods can also be used in conjunction with 549 * {@link android.animation.Animator Animator}-based animations, described more in the 550 * <a href="#Animation">Animation</a> section. 551 * </p> 552 * 553 * <a name="Animation"></a> 554 * <h3>Animation</h3> 555 * <p> 556 * Starting with Android 3.0, the preferred way of animating views is to use the 557 * {@link android.animation} package APIs. These {@link android.animation.Animator Animator}-based 558 * classes change actual properties of the View object, such as {@link #setAlpha(float) alpha} and 559 * {@link #setTranslationX(float) translationX}. This behavior is contrasted to that of the pre-3.0 560 * {@link android.view.animation.Animation Animation}-based classes, which instead animate only 561 * how the view is drawn on the display. In particular, the {@link ViewPropertyAnimator} class 562 * makes animating these View properties particularly easy and efficient. 563 * </p> 564 * <p> 565 * Alternatively, you can use the pre-3.0 animation classes to animate how Views are rendered. 566 * You can attach an {@link Animation} object to a view using 567 * {@link #setAnimation(Animation)} or 568 * {@link #startAnimation(Animation)}. The animation can alter the scale, 569 * rotation, translation and alpha of a view over time. If the animation is 570 * attached to a view that has children, the animation will affect the entire 571 * subtree rooted by that node. When an animation is started, the framework will 572 * take care of redrawing the appropriate views until the animation completes. 573 * </p> 574 * 575 * <a name="Security"></a> 576 * <h3>Security</h3> 577 * <p> 578 * Sometimes it is essential that an application be able to verify that an action 579 * is being performed with the full knowledge and consent of the user, such as 580 * granting a permission request, making a purchase or clicking on an advertisement. 581 * Unfortunately, a malicious application could try to spoof the user into 582 * performing these actions, unaware, by concealing the intended purpose of the view. 583 * As a remedy, the framework offers a touch filtering mechanism that can be used to 584 * improve the security of views that provide access to sensitive functionality. 585 * </p><p> 586 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured(boolean)} or set the 587 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 588 * will discard touches that are received whenever the view's window is obscured by 589 * another visible window. As a result, the view will not receive touches whenever a 590 * toast, dialog or other window appears above the view's window. 591 * </p><p> 592 * For more fine-grained control over security, consider overriding the 593 * {@link #onFilterTouchEventForSecurity(MotionEvent)} method to implement your own 594 * security policy. See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 595 * </p> 596 * 597 * @attr ref android.R.styleable#View_alpha 598 * @attr ref android.R.styleable#View_background 599 * @attr ref android.R.styleable#View_clickable 600 * @attr ref android.R.styleable#View_contentDescription 601 * @attr ref android.R.styleable#View_drawingCacheQuality 602 * @attr ref android.R.styleable#View_duplicateParentState 603 * @attr ref android.R.styleable#View_id 604 * @attr ref android.R.styleable#View_requiresFadingEdge 605 * @attr ref android.R.styleable#View_fadeScrollbars 606 * @attr ref android.R.styleable#View_fadingEdgeLength 607 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 608 * @attr ref android.R.styleable#View_fitsSystemWindows 609 * @attr ref android.R.styleable#View_isScrollContainer 610 * @attr ref android.R.styleable#View_focusable 611 * @attr ref android.R.styleable#View_focusableInTouchMode 612 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 613 * @attr ref android.R.styleable#View_keepScreenOn 614 * @attr ref android.R.styleable#View_layerType 615 * @attr ref android.R.styleable#View_longClickable 616 * @attr ref android.R.styleable#View_minHeight 617 * @attr ref android.R.styleable#View_minWidth 618 * @attr ref android.R.styleable#View_nextFocusDown 619 * @attr ref android.R.styleable#View_nextFocusLeft 620 * @attr ref android.R.styleable#View_nextFocusRight 621 * @attr ref android.R.styleable#View_nextFocusUp 622 * @attr ref android.R.styleable#View_onClick 623 * @attr ref android.R.styleable#View_padding 624 * @attr ref android.R.styleable#View_paddingBottom 625 * @attr ref android.R.styleable#View_paddingLeft 626 * @attr ref android.R.styleable#View_paddingRight 627 * @attr ref android.R.styleable#View_paddingTop 628 * @attr ref android.R.styleable#View_paddingStart 629 * @attr ref android.R.styleable#View_paddingEnd 630 * @attr ref android.R.styleable#View_saveEnabled 631 * @attr ref android.R.styleable#View_rotation 632 * @attr ref android.R.styleable#View_rotationX 633 * @attr ref android.R.styleable#View_rotationY 634 * @attr ref android.R.styleable#View_scaleX 635 * @attr ref android.R.styleable#View_scaleY 636 * @attr ref android.R.styleable#View_scrollX 637 * @attr ref android.R.styleable#View_scrollY 638 * @attr ref android.R.styleable#View_scrollbarSize 639 * @attr ref android.R.styleable#View_scrollbarStyle 640 * @attr ref android.R.styleable#View_scrollbars 641 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 642 * @attr ref android.R.styleable#View_scrollbarFadeDuration 643 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 644 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 645 * @attr ref android.R.styleable#View_scrollbarThumbVertical 646 * @attr ref android.R.styleable#View_scrollbarTrackVertical 647 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 648 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 649 * @attr ref android.R.styleable#View_soundEffectsEnabled 650 * @attr ref android.R.styleable#View_tag 651 * @attr ref android.R.styleable#View_textAlignment 652 * @attr ref android.R.styleable#View_transformPivotX 653 * @attr ref android.R.styleable#View_transformPivotY 654 * @attr ref android.R.styleable#View_translationX 655 * @attr ref android.R.styleable#View_translationY 656 * @attr ref android.R.styleable#View_visibility 657 * 658 * @see android.view.ViewGroup 659 */ 660public class View implements Drawable.Callback, Drawable.Callback2, KeyEvent.Callback, 661 AccessibilityEventSource { 662 private static final boolean DBG = false; 663 664 /** 665 * The logging tag used by this class with android.util.Log. 666 */ 667 protected static final String VIEW_LOG_TAG = "View"; 668 669 /** 670 * When set to true, apps will draw debugging information about their layouts. 671 * 672 * @hide 673 */ 674 public static final String DEBUG_LAYOUT_PROPERTY = "debug.layout"; 675 676 /** 677 * Used to mark a View that has no ID. 678 */ 679 public static final int NO_ID = -1; 680 681 /** 682 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 683 * calling setFlags. 684 */ 685 private static final int NOT_FOCUSABLE = 0x00000000; 686 687 /** 688 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 689 * setFlags. 690 */ 691 private static final int FOCUSABLE = 0x00000001; 692 693 /** 694 * Mask for use with setFlags indicating bits used for focus. 695 */ 696 private static final int FOCUSABLE_MASK = 0x00000001; 697 698 /** 699 * This view will adjust its padding to fit sytem windows (e.g. status bar) 700 */ 701 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 702 703 /** 704 * This view is visible. 705 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 706 * android:visibility}. 707 */ 708 public static final int VISIBLE = 0x00000000; 709 710 /** 711 * This view is invisible, but it still takes up space for layout purposes. 712 * Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 713 * android:visibility}. 714 */ 715 public static final int INVISIBLE = 0x00000004; 716 717 /** 718 * This view is invisible, and it doesn't take any space for layout 719 * purposes. Use with {@link #setVisibility} and <a href="#attr_android:visibility">{@code 720 * android:visibility}. 721 */ 722 public static final int GONE = 0x00000008; 723 724 /** 725 * Mask for use with setFlags indicating bits used for visibility. 726 * {@hide} 727 */ 728 static final int VISIBILITY_MASK = 0x0000000C; 729 730 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 731 732 /** 733 * This view is enabled. Interpretation varies by subclass. 734 * Use with ENABLED_MASK when calling setFlags. 735 * {@hide} 736 */ 737 static final int ENABLED = 0x00000000; 738 739 /** 740 * This view is disabled. Interpretation varies by subclass. 741 * Use with ENABLED_MASK when calling setFlags. 742 * {@hide} 743 */ 744 static final int DISABLED = 0x00000020; 745 746 /** 747 * Mask for use with setFlags indicating bits used for indicating whether 748 * this view is enabled 749 * {@hide} 750 */ 751 static final int ENABLED_MASK = 0x00000020; 752 753 /** 754 * This view won't draw. {@link #onDraw(android.graphics.Canvas)} won't be 755 * called and further optimizations will be performed. It is okay to have 756 * this flag set and a background. Use with DRAW_MASK when calling setFlags. 757 * {@hide} 758 */ 759 static final int WILL_NOT_DRAW = 0x00000080; 760 761 /** 762 * Mask for use with setFlags indicating bits used for indicating whether 763 * this view is will draw 764 * {@hide} 765 */ 766 static final int DRAW_MASK = 0x00000080; 767 768 /** 769 * <p>This view doesn't show scrollbars.</p> 770 * {@hide} 771 */ 772 static final int SCROLLBARS_NONE = 0x00000000; 773 774 /** 775 * <p>This view shows horizontal scrollbars.</p> 776 * {@hide} 777 */ 778 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 779 780 /** 781 * <p>This view shows vertical scrollbars.</p> 782 * {@hide} 783 */ 784 static final int SCROLLBARS_VERTICAL = 0x00000200; 785 786 /** 787 * <p>Mask for use with setFlags indicating bits used for indicating which 788 * scrollbars are enabled.</p> 789 * {@hide} 790 */ 791 static final int SCROLLBARS_MASK = 0x00000300; 792 793 /** 794 * Indicates that the view should filter touches when its window is obscured. 795 * Refer to the class comments for more information about this security feature. 796 * {@hide} 797 */ 798 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 799 800 /** 801 * Set for framework elements that use FITS_SYSTEM_WINDOWS, to indicate 802 * that they are optional and should be skipped if the window has 803 * requested system UI flags that ignore those insets for layout. 804 */ 805 static final int OPTIONAL_FITS_SYSTEM_WINDOWS = 0x00000800; 806 807 /** 808 * <p>This view doesn't show fading edges.</p> 809 * {@hide} 810 */ 811 static final int FADING_EDGE_NONE = 0x00000000; 812 813 /** 814 * <p>This view shows horizontal fading edges.</p> 815 * {@hide} 816 */ 817 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 818 819 /** 820 * <p>This view shows vertical fading edges.</p> 821 * {@hide} 822 */ 823 static final int FADING_EDGE_VERTICAL = 0x00002000; 824 825 /** 826 * <p>Mask for use with setFlags indicating bits used for indicating which 827 * fading edges are enabled.</p> 828 * {@hide} 829 */ 830 static final int FADING_EDGE_MASK = 0x00003000; 831 832 /** 833 * <p>Indicates this view can be clicked. When clickable, a View reacts 834 * to clicks by notifying the OnClickListener.<p> 835 * {@hide} 836 */ 837 static final int CLICKABLE = 0x00004000; 838 839 /** 840 * <p>Indicates this view is caching its drawing into a bitmap.</p> 841 * {@hide} 842 */ 843 static final int DRAWING_CACHE_ENABLED = 0x00008000; 844 845 /** 846 * <p>Indicates that no icicle should be saved for this view.<p> 847 * {@hide} 848 */ 849 static final int SAVE_DISABLED = 0x000010000; 850 851 /** 852 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 853 * property.</p> 854 * {@hide} 855 */ 856 static final int SAVE_DISABLED_MASK = 0x000010000; 857 858 /** 859 * <p>Indicates that no drawing cache should ever be created for this view.<p> 860 * {@hide} 861 */ 862 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 863 864 /** 865 * <p>Indicates this view can take / keep focus when int touch mode.</p> 866 * {@hide} 867 */ 868 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 869 870 /** 871 * <p>Enables low quality mode for the drawing cache.</p> 872 */ 873 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 874 875 /** 876 * <p>Enables high quality mode for the drawing cache.</p> 877 */ 878 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 879 880 /** 881 * <p>Enables automatic quality mode for the drawing cache.</p> 882 */ 883 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 884 885 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 886 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 887 }; 888 889 /** 890 * <p>Mask for use with setFlags indicating bits used for the cache 891 * quality property.</p> 892 * {@hide} 893 */ 894 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 895 896 /** 897 * <p> 898 * Indicates this view can be long clicked. When long clickable, a View 899 * reacts to long clicks by notifying the OnLongClickListener or showing a 900 * context menu. 901 * </p> 902 * {@hide} 903 */ 904 static final int LONG_CLICKABLE = 0x00200000; 905 906 /** 907 * <p>Indicates that this view gets its drawable states from its direct parent 908 * and ignores its original internal states.</p> 909 * 910 * @hide 911 */ 912 static final int DUPLICATE_PARENT_STATE = 0x00400000; 913 914 /** 915 * The scrollbar style to display the scrollbars inside the content area, 916 * without increasing the padding. The scrollbars will be overlaid with 917 * translucency on the view's content. 918 */ 919 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 920 921 /** 922 * The scrollbar style to display the scrollbars inside the padded area, 923 * increasing the padding of the view. The scrollbars will not overlap the 924 * content area of the view. 925 */ 926 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 927 928 /** 929 * The scrollbar style to display the scrollbars at the edge of the view, 930 * without increasing the padding. The scrollbars will be overlaid with 931 * translucency. 932 */ 933 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 934 935 /** 936 * The scrollbar style to display the scrollbars at the edge of the view, 937 * increasing the padding of the view. The scrollbars will only overlap the 938 * background, if any. 939 */ 940 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 941 942 /** 943 * Mask to check if the scrollbar style is overlay or inset. 944 * {@hide} 945 */ 946 static final int SCROLLBARS_INSET_MASK = 0x01000000; 947 948 /** 949 * Mask to check if the scrollbar style is inside or outside. 950 * {@hide} 951 */ 952 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 953 954 /** 955 * Mask for scrollbar style. 956 * {@hide} 957 */ 958 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 959 960 /** 961 * View flag indicating that the screen should remain on while the 962 * window containing this view is visible to the user. This effectively 963 * takes care of automatically setting the WindowManager's 964 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 965 */ 966 public static final int KEEP_SCREEN_ON = 0x04000000; 967 968 /** 969 * View flag indicating whether this view should have sound effects enabled 970 * for events such as clicking and touching. 971 */ 972 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 973 974 /** 975 * View flag indicating whether this view should have haptic feedback 976 * enabled for events such as long presses. 977 */ 978 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 979 980 /** 981 * <p>Indicates that the view hierarchy should stop saving state when 982 * it reaches this view. If state saving is initiated immediately at 983 * the view, it will be allowed. 984 * {@hide} 985 */ 986 static final int PARENT_SAVE_DISABLED = 0x20000000; 987 988 /** 989 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 990 * {@hide} 991 */ 992 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 993 994 /** 995 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 996 * should add all focusable Views regardless if they are focusable in touch mode. 997 */ 998 public static final int FOCUSABLES_ALL = 0x00000000; 999 1000 /** 1001 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1002 * should add only Views focusable in touch mode. 1003 */ 1004 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 1005 1006 /** 1007 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 1008 * should add only accessibility focusable Views. 1009 * 1010 * @hide 1011 */ 1012 public static final int FOCUSABLES_ACCESSIBILITY = 0x00000002; 1013 1014 /** 1015 * Use with {@link #focusSearch(int)}. Move focus to the previous selectable 1016 * item. 1017 */ 1018 public static final int FOCUS_BACKWARD = 0x00000001; 1019 1020 /** 1021 * Use with {@link #focusSearch(int)}. Move focus to the next selectable 1022 * item. 1023 */ 1024 public static final int FOCUS_FORWARD = 0x00000002; 1025 1026 /** 1027 * Use with {@link #focusSearch(int)}. Move focus to the left. 1028 */ 1029 public static final int FOCUS_LEFT = 0x00000011; 1030 1031 /** 1032 * Use with {@link #focusSearch(int)}. Move focus up. 1033 */ 1034 public static final int FOCUS_UP = 0x00000021; 1035 1036 /** 1037 * Use with {@link #focusSearch(int)}. Move focus to the right. 1038 */ 1039 public static final int FOCUS_RIGHT = 0x00000042; 1040 1041 /** 1042 * Use with {@link #focusSearch(int)}. Move focus down. 1043 */ 1044 public static final int FOCUS_DOWN = 0x00000082; 1045 1046 // Accessibility focus directions. 1047 1048 /** 1049 * The accessibility focus which is the current user position when 1050 * interacting with the accessibility framework. 1051 */ 1052 public static final int FOCUS_ACCESSIBILITY = 0x00001000; 1053 1054 /** 1055 * Use with {@link #focusSearch(int)}. Move acessibility focus left. 1056 */ 1057 public static final int ACCESSIBILITY_FOCUS_LEFT = FOCUS_LEFT | FOCUS_ACCESSIBILITY; 1058 1059 /** 1060 * Use with {@link #focusSearch(int)}. Move acessibility focus up. 1061 */ 1062 public static final int ACCESSIBILITY_FOCUS_UP = FOCUS_UP | FOCUS_ACCESSIBILITY; 1063 1064 /** 1065 * Use with {@link #focusSearch(int)}. Move acessibility focus right. 1066 */ 1067 public static final int ACCESSIBILITY_FOCUS_RIGHT = FOCUS_RIGHT | FOCUS_ACCESSIBILITY; 1068 1069 /** 1070 * Use with {@link #focusSearch(int)}. Move acessibility focus down. 1071 */ 1072 public static final int ACCESSIBILITY_FOCUS_DOWN = FOCUS_DOWN | FOCUS_ACCESSIBILITY; 1073 1074 /** 1075 * Use with {@link #focusSearch(int)}. Move acessibility focus forward. 1076 */ 1077 public static final int ACCESSIBILITY_FOCUS_FORWARD = FOCUS_FORWARD | FOCUS_ACCESSIBILITY; 1078 1079 /** 1080 * Use with {@link #focusSearch(int)}. Move acessibility focus backward. 1081 */ 1082 public static final int ACCESSIBILITY_FOCUS_BACKWARD = FOCUS_BACKWARD | FOCUS_ACCESSIBILITY; 1083 1084 /** 1085 * Bits of {@link #getMeasuredWidthAndState()} and 1086 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1087 */ 1088 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1089 1090 /** 1091 * Bits of {@link #getMeasuredWidthAndState()} and 1092 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1093 */ 1094 public static final int MEASURED_STATE_MASK = 0xff000000; 1095 1096 /** 1097 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1098 * for functions that combine both width and height into a single int, 1099 * such as {@link #getMeasuredState()} and the childState argument of 1100 * {@link #resolveSizeAndState(int, int, int)}. 1101 */ 1102 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1103 1104 /** 1105 * Bit of {@link #getMeasuredWidthAndState()} and 1106 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1107 * is smaller that the space the view would like to have. 1108 */ 1109 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1110 1111 /** 1112 * Base View state sets 1113 */ 1114 // Singles 1115 /** 1116 * Indicates the view has no states set. States are used with 1117 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1118 * view depending on its state. 1119 * 1120 * @see android.graphics.drawable.Drawable 1121 * @see #getDrawableState() 1122 */ 1123 protected static final int[] EMPTY_STATE_SET; 1124 /** 1125 * Indicates the view is enabled. States are used with 1126 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1127 * view depending on its state. 1128 * 1129 * @see android.graphics.drawable.Drawable 1130 * @see #getDrawableState() 1131 */ 1132 protected static final int[] ENABLED_STATE_SET; 1133 /** 1134 * Indicates the view is focused. States are used with 1135 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1136 * view depending on its state. 1137 * 1138 * @see android.graphics.drawable.Drawable 1139 * @see #getDrawableState() 1140 */ 1141 protected static final int[] FOCUSED_STATE_SET; 1142 /** 1143 * Indicates the view is selected. States are used with 1144 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1145 * view depending on its state. 1146 * 1147 * @see android.graphics.drawable.Drawable 1148 * @see #getDrawableState() 1149 */ 1150 protected static final int[] SELECTED_STATE_SET; 1151 /** 1152 * Indicates the view is pressed. States are used with 1153 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1154 * view depending on its state. 1155 * 1156 * @see android.graphics.drawable.Drawable 1157 * @see #getDrawableState() 1158 * @hide 1159 */ 1160 protected static final int[] PRESSED_STATE_SET; 1161 /** 1162 * Indicates the view's window has focus. States are used with 1163 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1164 * view depending on its state. 1165 * 1166 * @see android.graphics.drawable.Drawable 1167 * @see #getDrawableState() 1168 */ 1169 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1170 // Doubles 1171 /** 1172 * Indicates the view is enabled and has the focus. 1173 * 1174 * @see #ENABLED_STATE_SET 1175 * @see #FOCUSED_STATE_SET 1176 */ 1177 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1178 /** 1179 * Indicates the view is enabled and selected. 1180 * 1181 * @see #ENABLED_STATE_SET 1182 * @see #SELECTED_STATE_SET 1183 */ 1184 protected static final int[] ENABLED_SELECTED_STATE_SET; 1185 /** 1186 * Indicates the view is enabled and that its window has focus. 1187 * 1188 * @see #ENABLED_STATE_SET 1189 * @see #WINDOW_FOCUSED_STATE_SET 1190 */ 1191 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1192 /** 1193 * Indicates the view is focused and selected. 1194 * 1195 * @see #FOCUSED_STATE_SET 1196 * @see #SELECTED_STATE_SET 1197 */ 1198 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1199 /** 1200 * Indicates the view has the focus and that its window has the focus. 1201 * 1202 * @see #FOCUSED_STATE_SET 1203 * @see #WINDOW_FOCUSED_STATE_SET 1204 */ 1205 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1206 /** 1207 * Indicates the view is selected and that its window has the focus. 1208 * 1209 * @see #SELECTED_STATE_SET 1210 * @see #WINDOW_FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1213 // Triples 1214 /** 1215 * Indicates the view is enabled, focused and selected. 1216 * 1217 * @see #ENABLED_STATE_SET 1218 * @see #FOCUSED_STATE_SET 1219 * @see #SELECTED_STATE_SET 1220 */ 1221 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1222 /** 1223 * Indicates the view is enabled, focused and its window has the focus. 1224 * 1225 * @see #ENABLED_STATE_SET 1226 * @see #FOCUSED_STATE_SET 1227 * @see #WINDOW_FOCUSED_STATE_SET 1228 */ 1229 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1230 /** 1231 * Indicates the view is enabled, selected and its window has the focus. 1232 * 1233 * @see #ENABLED_STATE_SET 1234 * @see #SELECTED_STATE_SET 1235 * @see #WINDOW_FOCUSED_STATE_SET 1236 */ 1237 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1238 /** 1239 * Indicates the view is focused, selected and its window has the focus. 1240 * 1241 * @see #FOCUSED_STATE_SET 1242 * @see #SELECTED_STATE_SET 1243 * @see #WINDOW_FOCUSED_STATE_SET 1244 */ 1245 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1246 /** 1247 * Indicates the view is enabled, focused, selected and its window 1248 * has the focus. 1249 * 1250 * @see #ENABLED_STATE_SET 1251 * @see #FOCUSED_STATE_SET 1252 * @see #SELECTED_STATE_SET 1253 * @see #WINDOW_FOCUSED_STATE_SET 1254 */ 1255 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1256 /** 1257 * Indicates the view is pressed and its window has the focus. 1258 * 1259 * @see #PRESSED_STATE_SET 1260 * @see #WINDOW_FOCUSED_STATE_SET 1261 */ 1262 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1263 /** 1264 * Indicates the view is pressed and selected. 1265 * 1266 * @see #PRESSED_STATE_SET 1267 * @see #SELECTED_STATE_SET 1268 */ 1269 protected static final int[] PRESSED_SELECTED_STATE_SET; 1270 /** 1271 * Indicates the view is pressed, selected and its window has the focus. 1272 * 1273 * @see #PRESSED_STATE_SET 1274 * @see #SELECTED_STATE_SET 1275 * @see #WINDOW_FOCUSED_STATE_SET 1276 */ 1277 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1278 /** 1279 * Indicates the view is pressed and focused. 1280 * 1281 * @see #PRESSED_STATE_SET 1282 * @see #FOCUSED_STATE_SET 1283 */ 1284 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1285 /** 1286 * Indicates the view is pressed, focused and its window has the focus. 1287 * 1288 * @see #PRESSED_STATE_SET 1289 * @see #FOCUSED_STATE_SET 1290 * @see #WINDOW_FOCUSED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1293 /** 1294 * Indicates the view is pressed, focused and selected. 1295 * 1296 * @see #PRESSED_STATE_SET 1297 * @see #SELECTED_STATE_SET 1298 * @see #FOCUSED_STATE_SET 1299 */ 1300 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1301 /** 1302 * Indicates the view is pressed, focused, selected and its window has the focus. 1303 * 1304 * @see #PRESSED_STATE_SET 1305 * @see #FOCUSED_STATE_SET 1306 * @see #SELECTED_STATE_SET 1307 * @see #WINDOW_FOCUSED_STATE_SET 1308 */ 1309 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1310 /** 1311 * Indicates the view is pressed and enabled. 1312 * 1313 * @see #PRESSED_STATE_SET 1314 * @see #ENABLED_STATE_SET 1315 */ 1316 protected static final int[] PRESSED_ENABLED_STATE_SET; 1317 /** 1318 * Indicates the view is pressed, enabled and its window has the focus. 1319 * 1320 * @see #PRESSED_STATE_SET 1321 * @see #ENABLED_STATE_SET 1322 * @see #WINDOW_FOCUSED_STATE_SET 1323 */ 1324 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1325 /** 1326 * Indicates the view is pressed, enabled and selected. 1327 * 1328 * @see #PRESSED_STATE_SET 1329 * @see #ENABLED_STATE_SET 1330 * @see #SELECTED_STATE_SET 1331 */ 1332 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1333 /** 1334 * Indicates the view is pressed, enabled, selected and its window has the 1335 * focus. 1336 * 1337 * @see #PRESSED_STATE_SET 1338 * @see #ENABLED_STATE_SET 1339 * @see #SELECTED_STATE_SET 1340 * @see #WINDOW_FOCUSED_STATE_SET 1341 */ 1342 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1343 /** 1344 * Indicates the view is pressed, enabled and focused. 1345 * 1346 * @see #PRESSED_STATE_SET 1347 * @see #ENABLED_STATE_SET 1348 * @see #FOCUSED_STATE_SET 1349 */ 1350 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1351 /** 1352 * Indicates the view is pressed, enabled, focused and its window has the 1353 * focus. 1354 * 1355 * @see #PRESSED_STATE_SET 1356 * @see #ENABLED_STATE_SET 1357 * @see #FOCUSED_STATE_SET 1358 * @see #WINDOW_FOCUSED_STATE_SET 1359 */ 1360 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1361 /** 1362 * Indicates the view is pressed, enabled, focused and selected. 1363 * 1364 * @see #PRESSED_STATE_SET 1365 * @see #ENABLED_STATE_SET 1366 * @see #SELECTED_STATE_SET 1367 * @see #FOCUSED_STATE_SET 1368 */ 1369 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1370 /** 1371 * Indicates the view is pressed, enabled, focused, selected and its window 1372 * has the focus. 1373 * 1374 * @see #PRESSED_STATE_SET 1375 * @see #ENABLED_STATE_SET 1376 * @see #SELECTED_STATE_SET 1377 * @see #FOCUSED_STATE_SET 1378 * @see #WINDOW_FOCUSED_STATE_SET 1379 */ 1380 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1381 1382 /** 1383 * The order here is very important to {@link #getDrawableState()} 1384 */ 1385 private static final int[][] VIEW_STATE_SETS; 1386 1387 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1388 static final int VIEW_STATE_SELECTED = 1 << 1; 1389 static final int VIEW_STATE_FOCUSED = 1 << 2; 1390 static final int VIEW_STATE_ENABLED = 1 << 3; 1391 static final int VIEW_STATE_PRESSED = 1 << 4; 1392 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1393 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1394 static final int VIEW_STATE_HOVERED = 1 << 7; 1395 static final int VIEW_STATE_DRAG_CAN_ACCEPT = 1 << 8; 1396 static final int VIEW_STATE_DRAG_HOVERED = 1 << 9; 1397 1398 static final int[] VIEW_STATE_IDS = new int[] { 1399 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1400 R.attr.state_selected, VIEW_STATE_SELECTED, 1401 R.attr.state_focused, VIEW_STATE_FOCUSED, 1402 R.attr.state_enabled, VIEW_STATE_ENABLED, 1403 R.attr.state_pressed, VIEW_STATE_PRESSED, 1404 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1405 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1406 R.attr.state_hovered, VIEW_STATE_HOVERED, 1407 R.attr.state_drag_can_accept, VIEW_STATE_DRAG_CAN_ACCEPT, 1408 R.attr.state_drag_hovered, VIEW_STATE_DRAG_HOVERED 1409 }; 1410 1411 static { 1412 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1413 throw new IllegalStateException( 1414 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1415 } 1416 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1417 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1418 int viewState = R.styleable.ViewDrawableStates[i]; 1419 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1420 if (VIEW_STATE_IDS[j] == viewState) { 1421 orderedIds[i * 2] = viewState; 1422 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1423 } 1424 } 1425 } 1426 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1427 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1428 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1429 int numBits = Integer.bitCount(i); 1430 int[] set = new int[numBits]; 1431 int pos = 0; 1432 for (int j = 0; j < orderedIds.length; j += 2) { 1433 if ((i & orderedIds[j+1]) != 0) { 1434 set[pos++] = orderedIds[j]; 1435 } 1436 } 1437 VIEW_STATE_SETS[i] = set; 1438 } 1439 1440 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1441 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1442 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1443 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1444 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1445 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1446 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1447 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1448 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1449 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1450 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1451 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1452 | VIEW_STATE_FOCUSED]; 1453 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1454 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1455 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1456 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1457 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1458 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1459 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1460 | VIEW_STATE_ENABLED]; 1461 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1462 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1463 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1464 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1465 | VIEW_STATE_ENABLED]; 1466 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1467 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1468 | VIEW_STATE_ENABLED]; 1469 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1470 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1471 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1472 1473 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1474 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1475 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1476 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1477 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1478 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1479 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1480 | VIEW_STATE_PRESSED]; 1481 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1482 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1483 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1484 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1485 | VIEW_STATE_PRESSED]; 1486 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1487 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1488 | VIEW_STATE_PRESSED]; 1489 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1490 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1491 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1492 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1493 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1494 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1495 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1496 | VIEW_STATE_PRESSED]; 1497 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1498 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1499 | VIEW_STATE_PRESSED]; 1500 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1501 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1502 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1503 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1504 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1505 | VIEW_STATE_PRESSED]; 1506 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1507 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1508 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1509 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1510 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1511 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1512 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1513 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1514 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1515 | VIEW_STATE_PRESSED]; 1516 } 1517 1518 /** 1519 * Accessibility event types that are dispatched for text population. 1520 */ 1521 private static final int POPULATING_ACCESSIBILITY_EVENT_TYPES = 1522 AccessibilityEvent.TYPE_VIEW_CLICKED 1523 | AccessibilityEvent.TYPE_VIEW_LONG_CLICKED 1524 | AccessibilityEvent.TYPE_VIEW_SELECTED 1525 | AccessibilityEvent.TYPE_VIEW_FOCUSED 1526 | AccessibilityEvent.TYPE_WINDOW_STATE_CHANGED 1527 | AccessibilityEvent.TYPE_VIEW_HOVER_ENTER 1528 | AccessibilityEvent.TYPE_VIEW_HOVER_EXIT 1529 | AccessibilityEvent.TYPE_VIEW_TEXT_CHANGED 1530 | AccessibilityEvent.TYPE_VIEW_TEXT_SELECTION_CHANGED 1531 | AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED; 1532 1533 /** 1534 * Temporary Rect currently for use in setBackground(). This will probably 1535 * be extended in the future to hold our own class with more than just 1536 * a Rect. :) 1537 */ 1538 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1539 1540 /** 1541 * Map used to store views' tags. 1542 */ 1543 private SparseArray<Object> mKeyedTags; 1544 1545 /** 1546 * The next available accessiiblity id. 1547 */ 1548 private static int sNextAccessibilityViewId; 1549 1550 /** 1551 * The animation currently associated with this view. 1552 * @hide 1553 */ 1554 protected Animation mCurrentAnimation = null; 1555 1556 /** 1557 * Width as measured during measure pass. 1558 * {@hide} 1559 */ 1560 @ViewDebug.ExportedProperty(category = "measurement") 1561 int mMeasuredWidth; 1562 1563 /** 1564 * Height as measured during measure pass. 1565 * {@hide} 1566 */ 1567 @ViewDebug.ExportedProperty(category = "measurement") 1568 int mMeasuredHeight; 1569 1570 /** 1571 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1572 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1573 * its display list. This flag, used only when hw accelerated, allows us to clear the 1574 * flag while retaining this information until it's needed (at getDisplayList() time and 1575 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1576 * 1577 * {@hide} 1578 */ 1579 boolean mRecreateDisplayList = false; 1580 1581 /** 1582 * The view's identifier. 1583 * {@hide} 1584 * 1585 * @see #setId(int) 1586 * @see #getId() 1587 */ 1588 @ViewDebug.ExportedProperty(resolveId = true) 1589 int mID = NO_ID; 1590 1591 /** 1592 * The stable ID of this view for accessibility purposes. 1593 */ 1594 int mAccessibilityViewId = NO_ID; 1595 1596 /** 1597 * The view's tag. 1598 * {@hide} 1599 * 1600 * @see #setTag(Object) 1601 * @see #getTag() 1602 */ 1603 protected Object mTag; 1604 1605 // for mPrivateFlags: 1606 /** {@hide} */ 1607 static final int WANTS_FOCUS = 0x00000001; 1608 /** {@hide} */ 1609 static final int FOCUSED = 0x00000002; 1610 /** {@hide} */ 1611 static final int SELECTED = 0x00000004; 1612 /** {@hide} */ 1613 static final int IS_ROOT_NAMESPACE = 0x00000008; 1614 /** {@hide} */ 1615 static final int HAS_BOUNDS = 0x00000010; 1616 /** {@hide} */ 1617 static final int DRAWN = 0x00000020; 1618 /** 1619 * When this flag is set, this view is running an animation on behalf of its 1620 * children and should therefore not cancel invalidate requests, even if they 1621 * lie outside of this view's bounds. 1622 * 1623 * {@hide} 1624 */ 1625 static final int DRAW_ANIMATION = 0x00000040; 1626 /** {@hide} */ 1627 static final int SKIP_DRAW = 0x00000080; 1628 /** {@hide} */ 1629 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1630 /** {@hide} */ 1631 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1632 /** {@hide} */ 1633 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1634 /** {@hide} */ 1635 static final int MEASURED_DIMENSION_SET = 0x00000800; 1636 /** {@hide} */ 1637 static final int FORCE_LAYOUT = 0x00001000; 1638 /** {@hide} */ 1639 static final int LAYOUT_REQUIRED = 0x00002000; 1640 1641 private static final int PRESSED = 0x00004000; 1642 1643 /** {@hide} */ 1644 static final int DRAWING_CACHE_VALID = 0x00008000; 1645 /** 1646 * Flag used to indicate that this view should be drawn once more (and only once 1647 * more) after its animation has completed. 1648 * {@hide} 1649 */ 1650 static final int ANIMATION_STARTED = 0x00010000; 1651 1652 private static final int SAVE_STATE_CALLED = 0x00020000; 1653 1654 /** 1655 * Indicates that the View returned true when onSetAlpha() was called and that 1656 * the alpha must be restored. 1657 * {@hide} 1658 */ 1659 static final int ALPHA_SET = 0x00040000; 1660 1661 /** 1662 * Set by {@link #setScrollContainer(boolean)}. 1663 */ 1664 static final int SCROLL_CONTAINER = 0x00080000; 1665 1666 /** 1667 * Set by {@link #setScrollContainer(boolean)}. 1668 */ 1669 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1670 1671 /** 1672 * View flag indicating whether this view was invalidated (fully or partially.) 1673 * 1674 * @hide 1675 */ 1676 static final int DIRTY = 0x00200000; 1677 1678 /** 1679 * View flag indicating whether this view was invalidated by an opaque 1680 * invalidate request. 1681 * 1682 * @hide 1683 */ 1684 static final int DIRTY_OPAQUE = 0x00400000; 1685 1686 /** 1687 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1688 * 1689 * @hide 1690 */ 1691 static final int DIRTY_MASK = 0x00600000; 1692 1693 /** 1694 * Indicates whether the background is opaque. 1695 * 1696 * @hide 1697 */ 1698 static final int OPAQUE_BACKGROUND = 0x00800000; 1699 1700 /** 1701 * Indicates whether the scrollbars are opaque. 1702 * 1703 * @hide 1704 */ 1705 static final int OPAQUE_SCROLLBARS = 0x01000000; 1706 1707 /** 1708 * Indicates whether the view is opaque. 1709 * 1710 * @hide 1711 */ 1712 static final int OPAQUE_MASK = 0x01800000; 1713 1714 /** 1715 * Indicates a prepressed state; 1716 * the short time between ACTION_DOWN and recognizing 1717 * a 'real' press. Prepressed is used to recognize quick taps 1718 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1719 * 1720 * @hide 1721 */ 1722 private static final int PREPRESSED = 0x02000000; 1723 1724 /** 1725 * Indicates whether the view is temporarily detached. 1726 * 1727 * @hide 1728 */ 1729 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1730 1731 /** 1732 * Indicates that we should awaken scroll bars once attached 1733 * 1734 * @hide 1735 */ 1736 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1737 1738 /** 1739 * Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT. 1740 * @hide 1741 */ 1742 private static final int HOVERED = 0x10000000; 1743 1744 /** 1745 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1746 * for transform operations 1747 * 1748 * @hide 1749 */ 1750 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1751 1752 /** {@hide} */ 1753 static final int ACTIVATED = 0x40000000; 1754 1755 /** 1756 * Indicates that this view was specifically invalidated, not just dirtied because some 1757 * child view was invalidated. The flag is used to determine when we need to recreate 1758 * a view's display list (as opposed to just returning a reference to its existing 1759 * display list). 1760 * 1761 * @hide 1762 */ 1763 static final int INVALIDATED = 0x80000000; 1764 1765 /* Masks for mPrivateFlags2 */ 1766 1767 /** 1768 * Indicates that this view has reported that it can accept the current drag's content. 1769 * Cleared when the drag operation concludes. 1770 * @hide 1771 */ 1772 static final int DRAG_CAN_ACCEPT = 0x00000001; 1773 1774 /** 1775 * Indicates that this view is currently directly under the drag location in a 1776 * drag-and-drop operation involving content that it can accept. Cleared when 1777 * the drag exits the view, or when the drag operation concludes. 1778 * @hide 1779 */ 1780 static final int DRAG_HOVERED = 0x00000002; 1781 1782 /** 1783 * Horizontal layout direction of this view is from Left to Right. 1784 * Use with {@link #setLayoutDirection}. 1785 */ 1786 public static final int LAYOUT_DIRECTION_LTR = 0; 1787 1788 /** 1789 * Horizontal layout direction of this view is from Right to Left. 1790 * Use with {@link #setLayoutDirection}. 1791 */ 1792 public static final int LAYOUT_DIRECTION_RTL = 1; 1793 1794 /** 1795 * Horizontal layout direction of this view is inherited from its parent. 1796 * Use with {@link #setLayoutDirection}. 1797 */ 1798 public static final int LAYOUT_DIRECTION_INHERIT = 2; 1799 1800 /** 1801 * Horizontal layout direction of this view is from deduced from the default language 1802 * script for the locale. Use with {@link #setLayoutDirection}. 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 */ 1868 public static final int TEXT_DIRECTION_INHERIT = 0; 1869 1870 /** 1871 * Text direction is using "first strong algorithm". The first strong directional character 1872 * determines the paragraph direction. If there is no strong directional character, the 1873 * paragraph direction is the view's resolved layout direction. 1874 */ 1875 public static final int TEXT_DIRECTION_FIRST_STRONG = 1; 1876 1877 /** 1878 * Text direction is using "any-RTL" algorithm. The paragraph direction is RTL if it contains 1879 * any strong RTL character, otherwise it is LTR if it contains any strong LTR characters. 1880 * If there are neither, the paragraph direction is the view's resolved layout direction. 1881 */ 1882 public static final int TEXT_DIRECTION_ANY_RTL = 2; 1883 1884 /** 1885 * Text direction is forced to LTR. 1886 */ 1887 public static final int TEXT_DIRECTION_LTR = 3; 1888 1889 /** 1890 * Text direction is forced to RTL. 1891 */ 1892 public static final int TEXT_DIRECTION_RTL = 4; 1893 1894 /** 1895 * Text direction is coming from the system Locale. 1896 */ 1897 public static final int TEXT_DIRECTION_LOCALE = 5; 1898 1899 /** 1900 * Default text direction is inherited 1901 */ 1902 protected static int TEXT_DIRECTION_DEFAULT = TEXT_DIRECTION_INHERIT; 1903 1904 /** 1905 * Bit shift to get the horizontal layout direction. (bits after LAYOUT_DIRECTION_RESOLVED) 1906 * @hide 1907 */ 1908 static final int TEXT_DIRECTION_MASK_SHIFT = 6; 1909 1910 /** 1911 * Mask for use with private flags indicating bits used for text direction. 1912 * @hide 1913 */ 1914 static final int TEXT_DIRECTION_MASK = 0x00000007 << TEXT_DIRECTION_MASK_SHIFT; 1915 1916 /** 1917 * Array of text direction flags for mapping attribute "textDirection" to correct 1918 * flag value. 1919 * @hide 1920 */ 1921 private static final int[] TEXT_DIRECTION_FLAGS = { 1922 TEXT_DIRECTION_INHERIT << TEXT_DIRECTION_MASK_SHIFT, 1923 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_MASK_SHIFT, 1924 TEXT_DIRECTION_ANY_RTL << TEXT_DIRECTION_MASK_SHIFT, 1925 TEXT_DIRECTION_LTR << TEXT_DIRECTION_MASK_SHIFT, 1926 TEXT_DIRECTION_RTL << TEXT_DIRECTION_MASK_SHIFT, 1927 TEXT_DIRECTION_LOCALE << TEXT_DIRECTION_MASK_SHIFT 1928 }; 1929 1930 /** 1931 * Indicates whether the view text direction has been resolved. 1932 * @hide 1933 */ 1934 static final int TEXT_DIRECTION_RESOLVED = 0x00000008 << TEXT_DIRECTION_MASK_SHIFT; 1935 1936 /** 1937 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 1938 * @hide 1939 */ 1940 static final int TEXT_DIRECTION_RESOLVED_MASK_SHIFT = 10; 1941 1942 /** 1943 * Mask for use with private flags indicating bits used for resolved text direction. 1944 * @hide 1945 */ 1946 static final int TEXT_DIRECTION_RESOLVED_MASK = 0x00000007 << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1947 1948 /** 1949 * Indicates whether the view text direction has been resolved to the "first strong" heuristic. 1950 * @hide 1951 */ 1952 static final int TEXT_DIRECTION_RESOLVED_DEFAULT = 1953 TEXT_DIRECTION_FIRST_STRONG << TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 1954 1955 /* 1956 * Default text alignment. The text alignment of this View is inherited from its parent. 1957 * Use with {@link #setTextAlignment(int)} 1958 */ 1959 public static final int TEXT_ALIGNMENT_INHERIT = 0; 1960 1961 /** 1962 * Default for the root view. The gravity determines the text alignment, ALIGN_NORMAL, 1963 * ALIGN_CENTER, or ALIGN_OPPOSITE, which are relative to each paragraph’s text direction. 1964 * 1965 * Use with {@link #setTextAlignment(int)} 1966 */ 1967 public static final int TEXT_ALIGNMENT_GRAVITY = 1; 1968 1969 /** 1970 * Align to the start of the paragraph, e.g. ALIGN_NORMAL. 1971 * 1972 * Use with {@link #setTextAlignment(int)} 1973 */ 1974 public static final int TEXT_ALIGNMENT_TEXT_START = 2; 1975 1976 /** 1977 * Align to the end of the paragraph, e.g. ALIGN_OPPOSITE. 1978 * 1979 * Use with {@link #setTextAlignment(int)} 1980 */ 1981 public static final int TEXT_ALIGNMENT_TEXT_END = 3; 1982 1983 /** 1984 * Center the paragraph, e.g. ALIGN_CENTER. 1985 * 1986 * Use with {@link #setTextAlignment(int)} 1987 */ 1988 public static final int TEXT_ALIGNMENT_CENTER = 4; 1989 1990 /** 1991 * Align to the start of the view, which is ALIGN_LEFT if the view’s resolved 1992 * layoutDirection is LTR, and ALIGN_RIGHT otherwise. 1993 * 1994 * Use with {@link #setTextAlignment(int)} 1995 */ 1996 public static final int TEXT_ALIGNMENT_VIEW_START = 5; 1997 1998 /** 1999 * Align to the end of the view, which is ALIGN_RIGHT if the view’s resolved 2000 * layoutDirection is LTR, and ALIGN_LEFT otherwise. 2001 * 2002 * Use with {@link #setTextAlignment(int)} 2003 */ 2004 public static final int TEXT_ALIGNMENT_VIEW_END = 6; 2005 2006 /** 2007 * Default text alignment is inherited 2008 */ 2009 protected static int TEXT_ALIGNMENT_DEFAULT = TEXT_ALIGNMENT_GRAVITY; 2010 2011 /** 2012 * Bit shift to get the horizontal layout direction. (bits after DRAG_HOVERED) 2013 * @hide 2014 */ 2015 static final int TEXT_ALIGNMENT_MASK_SHIFT = 13; 2016 2017 /** 2018 * Mask for use with private flags indicating bits used for text alignment. 2019 * @hide 2020 */ 2021 static final int TEXT_ALIGNMENT_MASK = 0x00000007 << TEXT_ALIGNMENT_MASK_SHIFT; 2022 2023 /** 2024 * Array of text direction flags for mapping attribute "textAlignment" to correct 2025 * flag value. 2026 * @hide 2027 */ 2028 private static final int[] TEXT_ALIGNMENT_FLAGS = { 2029 TEXT_ALIGNMENT_INHERIT << TEXT_ALIGNMENT_MASK_SHIFT, 2030 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_MASK_SHIFT, 2031 TEXT_ALIGNMENT_TEXT_START << TEXT_ALIGNMENT_MASK_SHIFT, 2032 TEXT_ALIGNMENT_TEXT_END << TEXT_ALIGNMENT_MASK_SHIFT, 2033 TEXT_ALIGNMENT_CENTER << TEXT_ALIGNMENT_MASK_SHIFT, 2034 TEXT_ALIGNMENT_VIEW_START << TEXT_ALIGNMENT_MASK_SHIFT, 2035 TEXT_ALIGNMENT_VIEW_END << TEXT_ALIGNMENT_MASK_SHIFT 2036 }; 2037 2038 /** 2039 * Indicates whether the view text alignment has been resolved. 2040 * @hide 2041 */ 2042 static final int TEXT_ALIGNMENT_RESOLVED = 0x00000008 << TEXT_ALIGNMENT_MASK_SHIFT; 2043 2044 /** 2045 * Bit shift to get the resolved text alignment. 2046 * @hide 2047 */ 2048 static final int TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT = 17; 2049 2050 /** 2051 * Mask for use with private flags indicating bits used for text alignment. 2052 * @hide 2053 */ 2054 static final int TEXT_ALIGNMENT_RESOLVED_MASK = 0x00000007 << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2055 2056 /** 2057 * Indicates whether if the view text alignment has been resolved to gravity 2058 */ 2059 public static final int TEXT_ALIGNMENT_RESOLVED_DEFAULT = 2060 TEXT_ALIGNMENT_GRAVITY << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 2061 2062 // Accessiblity constants for mPrivateFlags2 2063 2064 /** 2065 * Shift for accessibility related bits in {@link #mPrivateFlags2}. 2066 */ 2067 static final int IMPORTANT_FOR_ACCESSIBILITY_SHIFT = 20; 2068 2069 /** 2070 * Automatically determine whether a view is important for accessibility. 2071 */ 2072 public static final int IMPORTANT_FOR_ACCESSIBILITY_AUTO = 0x00000000; 2073 2074 /** 2075 * The view is important for accessibility. 2076 */ 2077 public static final int IMPORTANT_FOR_ACCESSIBILITY_YES = 0x00000001; 2078 2079 /** 2080 * The view is not important for accessibility. 2081 */ 2082 public static final int IMPORTANT_FOR_ACCESSIBILITY_NO = 0x00000002; 2083 2084 /** 2085 * The default whether the view is important for accessiblity. 2086 */ 2087 static final int IMPORTANT_FOR_ACCESSIBILITY_DEFAULT = IMPORTANT_FOR_ACCESSIBILITY_AUTO; 2088 2089 /** 2090 * Mask for obtainig the bits which specify how to determine 2091 * whether a view is important for accessibility. 2092 */ 2093 static final int IMPORTANT_FOR_ACCESSIBILITY_MASK = (IMPORTANT_FOR_ACCESSIBILITY_AUTO 2094 | IMPORTANT_FOR_ACCESSIBILITY_YES | IMPORTANT_FOR_ACCESSIBILITY_NO) 2095 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2096 2097 /** 2098 * Flag indicating whether a view has accessibility focus. 2099 */ 2100 static final int ACCESSIBILITY_FOCUSED = 0x00000040 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2101 2102 /** 2103 * Flag indicating whether a view state for accessibility has changed. 2104 */ 2105 static final int ACCESSIBILITY_STATE_CHANGED = 0x00000080 << IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 2106 2107 /* End of masks for mPrivateFlags2 */ 2108 2109 static final int DRAG_MASK = DRAG_CAN_ACCEPT | DRAG_HOVERED; 2110 2111 /** 2112 * Always allow a user to over-scroll this view, provided it is a 2113 * view that can scroll. 2114 * 2115 * @see #getOverScrollMode() 2116 * @see #setOverScrollMode(int) 2117 */ 2118 public static final int OVER_SCROLL_ALWAYS = 0; 2119 2120 /** 2121 * Allow a user to over-scroll this view only if the content is large 2122 * enough to meaningfully scroll, provided it is a view that can scroll. 2123 * 2124 * @see #getOverScrollMode() 2125 * @see #setOverScrollMode(int) 2126 */ 2127 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 2128 2129 /** 2130 * Never allow a user to over-scroll this view. 2131 * 2132 * @see #getOverScrollMode() 2133 * @see #setOverScrollMode(int) 2134 */ 2135 public static final int OVER_SCROLL_NEVER = 2; 2136 2137 /** 2138 * Special constant for {@link #setSystemUiVisibility(int)}: View has 2139 * requested the system UI (status bar) to be visible (the default). 2140 * 2141 * @see #setSystemUiVisibility(int) 2142 */ 2143 public static final int SYSTEM_UI_FLAG_VISIBLE = 0; 2144 2145 /** 2146 * Flag for {@link #setSystemUiVisibility(int)}: View has requested the 2147 * system UI to enter an unobtrusive "low profile" mode. 2148 * 2149 * <p>This is for use in games, book readers, video players, or any other 2150 * "immersive" application where the usual system chrome is deemed too distracting. 2151 * 2152 * <p>In low profile mode, the status bar and/or navigation icons may dim. 2153 * 2154 * @see #setSystemUiVisibility(int) 2155 */ 2156 public static final int SYSTEM_UI_FLAG_LOW_PROFILE = 0x00000001; 2157 2158 /** 2159 * Flag for {@link #setSystemUiVisibility(int)}: View has requested that the 2160 * system navigation be temporarily hidden. 2161 * 2162 * <p>This is an even less obtrusive state than that called for by 2163 * {@link #SYSTEM_UI_FLAG_LOW_PROFILE}; on devices that draw essential navigation controls 2164 * (Home, Back, and the like) on screen, <code>SYSTEM_UI_FLAG_HIDE_NAVIGATION</code> will cause 2165 * those to disappear. This is useful (in conjunction with the 2166 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN FLAG_FULLSCREEN} and 2167 * {@link android.view.WindowManager.LayoutParams#FLAG_LAYOUT_IN_SCREEN FLAG_LAYOUT_IN_SCREEN} 2168 * window flags) for displaying content using every last pixel on the display. 2169 * 2170 * <p>There is a limitation: because navigation controls are so important, the least user 2171 * interaction will cause them to reappear immediately. When this happens, both 2172 * this flag and {@link #SYSTEM_UI_FLAG_FULLSCREEN} will be cleared automatically, 2173 * so that both elements reappear at the same time. 2174 * 2175 * @see #setSystemUiVisibility(int) 2176 */ 2177 public static final int SYSTEM_UI_FLAG_HIDE_NAVIGATION = 0x00000002; 2178 2179 /** 2180 * Flag for {@link #setSystemUiVisibility(int)}: View has requested to go 2181 * into the normal fullscreen mode so that its content can take over the screen 2182 * while still allowing the user to interact with the application. 2183 * 2184 * <p>This has the same visual effect as 2185 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN 2186 * WindowManager.LayoutParams.FLAG_FULLSCREEN}, 2187 * meaning that non-critical screen decorations (such as the status bar) will be 2188 * hidden while the user is in the View's window, focusing the experience on 2189 * that content. Unlike the window flag, if you are using ActionBar in 2190 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2191 * Window.FEATURE_ACTION_BAR_OVERLAY}, then enabling this flag will also 2192 * hide the action bar. 2193 * 2194 * <p>This approach to going fullscreen is best used over the window flag when 2195 * it is a transient state -- that is, the application does this at certain 2196 * points in its user interaction where it wants to allow the user to focus 2197 * on content, but not as a continuous state. For situations where the application 2198 * would like to simply stay full screen the entire time (such as a game that 2199 * wants to take over the screen), the 2200 * {@link android.view.WindowManager.LayoutParams#FLAG_FULLSCREEN window flag} 2201 * is usually a better approach. The state set here will be removed by the system 2202 * in various situations (such as the user moving to another application) like 2203 * the other system UI states. 2204 * 2205 * <p>When using this flag, the application should provide some easy facility 2206 * for the user to go out of it. A common example would be in an e-book 2207 * reader, where tapping on the screen brings back whatever screen and UI 2208 * decorations that had been hidden while the user was immersed in reading 2209 * the book. 2210 * 2211 * @see #setSystemUiVisibility(int) 2212 */ 2213 public static final int SYSTEM_UI_FLAG_FULLSCREEN = 0x00000004; 2214 2215 /** 2216 * Flag for {@link #setSystemUiVisibility(int)}: When using other layout 2217 * flags, we would like a stable view of the content insets given to 2218 * {@link #fitSystemWindows(Rect)}. This means that the insets seen there 2219 * will always represent the worst case that the application can expect 2220 * as a continue state. In practice this means with any of system bar, 2221 * nav bar, and status bar shown, but not the space that would be needed 2222 * for an input method. 2223 * 2224 * <p>If you are using ActionBar in 2225 * overlay mode with {@link Window#FEATURE_ACTION_BAR_OVERLAY 2226 * Window.FEATURE_ACTION_BAR_OVERLAY}, this flag will also impact the 2227 * insets it adds to those given to the application. 2228 */ 2229 public static final int SYSTEM_UI_FLAG_LAYOUT_STABLE = 0x00000100; 2230 2231 /** 2232 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2233 * to be layed out as if it has requested 2234 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, even if it currently hasn't. This 2235 * allows it to avoid artifacts when switching in and out of that mode, at 2236 * the expense that some of its user interface may be covered by screen 2237 * decorations when they are shown. You can perform layout of your inner 2238 * UI elements to account for the navagation system UI through the 2239 * {@link #fitSystemWindows(Rect)} method. 2240 */ 2241 public static final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 0x00000200; 2242 2243 /** 2244 * Flag for {@link #setSystemUiVisibility(int)}: View would like its window 2245 * to be layed out as if it has requested 2246 * {@link #SYSTEM_UI_FLAG_FULLSCREEN}, even if it currently hasn't. This 2247 * allows it to avoid artifacts when switching in and out of that mode, at 2248 * the expense that some of its user interface may be covered by screen 2249 * decorations when they are shown. You can perform layout of your inner 2250 * UI elements to account for non-fullscreen system UI through the 2251 * {@link #fitSystemWindows(Rect)} method. 2252 */ 2253 public static final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN = 0x00000400; 2254 2255 /** 2256 * @deprecated Use {@link #SYSTEM_UI_FLAG_LOW_PROFILE} instead. 2257 */ 2258 public static final int STATUS_BAR_HIDDEN = SYSTEM_UI_FLAG_LOW_PROFILE; 2259 2260 /** 2261 * @deprecated Use {@link #SYSTEM_UI_FLAG_VISIBLE} instead. 2262 */ 2263 public static final int STATUS_BAR_VISIBLE = SYSTEM_UI_FLAG_VISIBLE; 2264 2265 /** 2266 * @hide 2267 * 2268 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2269 * out of the public fields to keep the undefined bits out of the developer's way. 2270 * 2271 * Flag to make the status bar not expandable. Unless you also 2272 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 2273 */ 2274 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 2275 2276 /** 2277 * @hide 2278 * 2279 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2280 * out of the public fields to keep the undefined bits out of the developer's way. 2281 * 2282 * Flag to hide notification icons and scrolling ticker text. 2283 */ 2284 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 2285 2286 /** 2287 * @hide 2288 * 2289 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2290 * out of the public fields to keep the undefined bits out of the developer's way. 2291 * 2292 * Flag to disable incoming notification alerts. This will not block 2293 * icons, but it will block sound, vibrating and other visual or aural notifications. 2294 */ 2295 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 2296 2297 /** 2298 * @hide 2299 * 2300 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2301 * out of the public fields to keep the undefined bits out of the developer's way. 2302 * 2303 * Flag to hide only the scrolling ticker. Note that 2304 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 2305 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 2306 */ 2307 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 2308 2309 /** 2310 * @hide 2311 * 2312 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2313 * out of the public fields to keep the undefined bits out of the developer's way. 2314 * 2315 * Flag to hide the center system info area. 2316 */ 2317 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 2318 2319 /** 2320 * @hide 2321 * 2322 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2323 * out of the public fields to keep the undefined bits out of the developer's way. 2324 * 2325 * Flag to hide only the home button. Don't use this 2326 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2327 */ 2328 public static final int STATUS_BAR_DISABLE_HOME = 0x00200000; 2329 2330 /** 2331 * @hide 2332 * 2333 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2334 * out of the public fields to keep the undefined bits out of the developer's way. 2335 * 2336 * Flag to hide only the back button. Don't use this 2337 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2338 */ 2339 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 2340 2341 /** 2342 * @hide 2343 * 2344 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2345 * out of the public fields to keep the undefined bits out of the developer's way. 2346 * 2347 * Flag to hide only the clock. You might use this if your activity has 2348 * its own clock making the status bar's clock redundant. 2349 */ 2350 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 2351 2352 /** 2353 * @hide 2354 * 2355 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 2356 * out of the public fields to keep the undefined bits out of the developer's way. 2357 * 2358 * Flag to hide only the recent apps button. Don't use this 2359 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 2360 */ 2361 public static final int STATUS_BAR_DISABLE_RECENT = 0x01000000; 2362 2363 /** 2364 * @hide 2365 */ 2366 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = 0x0000FFFF; 2367 2368 /** 2369 * These are the system UI flags that can be cleared by events outside 2370 * of an application. Currently this is just the ability to tap on the 2371 * screen while hiding the navigation bar to have it return. 2372 * @hide 2373 */ 2374 public static final int SYSTEM_UI_CLEARABLE_FLAGS = 2375 SYSTEM_UI_FLAG_LOW_PROFILE | SYSTEM_UI_FLAG_HIDE_NAVIGATION 2376 | SYSTEM_UI_FLAG_FULLSCREEN; 2377 2378 /** 2379 * Flags that can impact the layout in relation to system UI. 2380 */ 2381 public static final int SYSTEM_UI_LAYOUT_FLAGS = 2382 SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION 2383 | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN; 2384 2385 /** 2386 * Find views that render the specified text. 2387 * 2388 * @see #findViewsWithText(ArrayList, CharSequence, int) 2389 */ 2390 public static final int FIND_VIEWS_WITH_TEXT = 0x00000001; 2391 2392 /** 2393 * Find find views that contain the specified content description. 2394 * 2395 * @see #findViewsWithText(ArrayList, CharSequence, int) 2396 */ 2397 public static final int FIND_VIEWS_WITH_CONTENT_DESCRIPTION = 0x00000002; 2398 2399 /** 2400 * Find views that contain {@link AccessibilityNodeProvider}. Such 2401 * a View is a root of virtual view hierarchy and may contain the searched 2402 * text. If this flag is set Views with providers are automatically 2403 * added and it is a responsibility of the client to call the APIs of 2404 * the provider to determine whether the virtual tree rooted at this View 2405 * contains the text, i.e. getting the list of {@link AccessibilityNodeInfo}s 2406 * represeting the virtual views with this text. 2407 * 2408 * @see #findViewsWithText(ArrayList, CharSequence, int) 2409 * 2410 * @hide 2411 */ 2412 public static final int FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS = 0x00000004; 2413 2414 /** 2415 * Indicates that the screen has changed state and is now off. 2416 * 2417 * @see #onScreenStateChanged(int) 2418 */ 2419 public static final int SCREEN_STATE_OFF = 0x0; 2420 2421 /** 2422 * Indicates that the screen has changed state and is now on. 2423 * 2424 * @see #onScreenStateChanged(int) 2425 */ 2426 public static final int SCREEN_STATE_ON = 0x1; 2427 2428 /** 2429 * Controls the over-scroll mode for this view. 2430 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 2431 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 2432 * and {@link #OVER_SCROLL_NEVER}. 2433 */ 2434 private int mOverScrollMode; 2435 2436 /** 2437 * The parent this view is attached to. 2438 * {@hide} 2439 * 2440 * @see #getParent() 2441 */ 2442 protected ViewParent mParent; 2443 2444 /** 2445 * {@hide} 2446 */ 2447 AttachInfo mAttachInfo; 2448 2449 /** 2450 * {@hide} 2451 */ 2452 @ViewDebug.ExportedProperty(flagMapping = { 2453 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 2454 name = "FORCE_LAYOUT"), 2455 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 2456 name = "LAYOUT_REQUIRED"), 2457 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 2458 name = "DRAWING_CACHE_INVALID", outputIf = false), 2459 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 2460 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 2461 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 2462 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 2463 }) 2464 int mPrivateFlags; 2465 int mPrivateFlags2; 2466 2467 /** 2468 * This view's request for the visibility of the status bar. 2469 * @hide 2470 */ 2471 @ViewDebug.ExportedProperty(flagMapping = { 2472 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_LOW_PROFILE, 2473 equals = SYSTEM_UI_FLAG_LOW_PROFILE, 2474 name = "SYSTEM_UI_FLAG_LOW_PROFILE", outputIf = true), 2475 @ViewDebug.FlagToString(mask = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2476 equals = SYSTEM_UI_FLAG_HIDE_NAVIGATION, 2477 name = "SYSTEM_UI_FLAG_HIDE_NAVIGATION", outputIf = true), 2478 @ViewDebug.FlagToString(mask = PUBLIC_STATUS_BAR_VISIBILITY_MASK, 2479 equals = SYSTEM_UI_FLAG_VISIBLE, 2480 name = "SYSTEM_UI_FLAG_VISIBLE", outputIf = true) 2481 }) 2482 int mSystemUiVisibility; 2483 2484 /** 2485 * Reference count for transient state. 2486 * @see #setHasTransientState(boolean) 2487 */ 2488 int mTransientStateCount = 0; 2489 2490 /** 2491 * Count of how many windows this view has been attached to. 2492 */ 2493 int mWindowAttachCount; 2494 2495 /** 2496 * The layout parameters associated with this view and used by the parent 2497 * {@link android.view.ViewGroup} to determine how this view should be 2498 * laid out. 2499 * {@hide} 2500 */ 2501 protected ViewGroup.LayoutParams mLayoutParams; 2502 2503 /** 2504 * The view flags hold various views states. 2505 * {@hide} 2506 */ 2507 @ViewDebug.ExportedProperty 2508 int mViewFlags; 2509 2510 static class TransformationInfo { 2511 /** 2512 * The transform matrix for the View. This transform is calculated internally 2513 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2514 * is used by default. Do *not* use this variable directly; instead call 2515 * getMatrix(), which will automatically recalculate the matrix if necessary 2516 * to get the correct matrix based on the latest rotation and scale properties. 2517 */ 2518 private final Matrix mMatrix = new Matrix(); 2519 2520 /** 2521 * The transform matrix for the View. This transform is calculated internally 2522 * based on the rotation, scaleX, and scaleY properties. The identity matrix 2523 * is used by default. Do *not* use this variable directly; instead call 2524 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 2525 * to get the correct matrix based on the latest rotation and scale properties. 2526 */ 2527 private Matrix mInverseMatrix; 2528 2529 /** 2530 * An internal variable that tracks whether we need to recalculate the 2531 * transform matrix, based on whether the rotation or scaleX/Y properties 2532 * have changed since the matrix was last calculated. 2533 */ 2534 boolean mMatrixDirty = false; 2535 2536 /** 2537 * An internal variable that tracks whether we need to recalculate the 2538 * transform matrix, based on whether the rotation or scaleX/Y properties 2539 * have changed since the matrix was last calculated. 2540 */ 2541 private boolean mInverseMatrixDirty = true; 2542 2543 /** 2544 * A variable that tracks whether we need to recalculate the 2545 * transform matrix, based on whether the rotation or scaleX/Y properties 2546 * have changed since the matrix was last calculated. This variable 2547 * is only valid after a call to updateMatrix() or to a function that 2548 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 2549 */ 2550 private boolean mMatrixIsIdentity = true; 2551 2552 /** 2553 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 2554 */ 2555 private Camera mCamera = null; 2556 2557 /** 2558 * This matrix is used when computing the matrix for 3D rotations. 2559 */ 2560 private Matrix matrix3D = null; 2561 2562 /** 2563 * These prev values are used to recalculate a centered pivot point when necessary. The 2564 * pivot point is only used in matrix operations (when rotation, scale, or translation are 2565 * set), so thes values are only used then as well. 2566 */ 2567 private int mPrevWidth = -1; 2568 private int mPrevHeight = -1; 2569 2570 /** 2571 * The degrees rotation around the vertical axis through the pivot point. 2572 */ 2573 @ViewDebug.ExportedProperty 2574 float mRotationY = 0f; 2575 2576 /** 2577 * The degrees rotation around the horizontal axis through the pivot point. 2578 */ 2579 @ViewDebug.ExportedProperty 2580 float mRotationX = 0f; 2581 2582 /** 2583 * The degrees rotation around the pivot point. 2584 */ 2585 @ViewDebug.ExportedProperty 2586 float mRotation = 0f; 2587 2588 /** 2589 * The amount of translation of the object away from its left property (post-layout). 2590 */ 2591 @ViewDebug.ExportedProperty 2592 float mTranslationX = 0f; 2593 2594 /** 2595 * The amount of translation of the object away from its top property (post-layout). 2596 */ 2597 @ViewDebug.ExportedProperty 2598 float mTranslationY = 0f; 2599 2600 /** 2601 * The amount of scale in the x direction around the pivot point. A 2602 * value of 1 means no scaling is applied. 2603 */ 2604 @ViewDebug.ExportedProperty 2605 float mScaleX = 1f; 2606 2607 /** 2608 * The amount of scale in the y direction around the pivot point. A 2609 * value of 1 means no scaling is applied. 2610 */ 2611 @ViewDebug.ExportedProperty 2612 float mScaleY = 1f; 2613 2614 /** 2615 * The x location of the point around which the view is rotated and scaled. 2616 */ 2617 @ViewDebug.ExportedProperty 2618 float mPivotX = 0f; 2619 2620 /** 2621 * The y location of the point around which the view is rotated and scaled. 2622 */ 2623 @ViewDebug.ExportedProperty 2624 float mPivotY = 0f; 2625 2626 /** 2627 * The opacity of the View. This is a value from 0 to 1, where 0 means 2628 * completely transparent and 1 means completely opaque. 2629 */ 2630 @ViewDebug.ExportedProperty 2631 float mAlpha = 1f; 2632 } 2633 2634 TransformationInfo mTransformationInfo; 2635 2636 private boolean mLastIsOpaque; 2637 2638 /** 2639 * Convenience value to check for float values that are close enough to zero to be considered 2640 * zero. 2641 */ 2642 private static final float NONZERO_EPSILON = .001f; 2643 2644 /** 2645 * The distance in pixels from the left edge of this view's parent 2646 * to the left edge of this view. 2647 * {@hide} 2648 */ 2649 @ViewDebug.ExportedProperty(category = "layout") 2650 protected int mLeft; 2651 /** 2652 * The distance in pixels from the left edge of this view's parent 2653 * to the right edge of this view. 2654 * {@hide} 2655 */ 2656 @ViewDebug.ExportedProperty(category = "layout") 2657 protected int mRight; 2658 /** 2659 * The distance in pixels from the top edge of this view's parent 2660 * to the top edge of this view. 2661 * {@hide} 2662 */ 2663 @ViewDebug.ExportedProperty(category = "layout") 2664 protected int mTop; 2665 /** 2666 * The distance in pixels from the top edge of this view's parent 2667 * to the bottom edge of this view. 2668 * {@hide} 2669 */ 2670 @ViewDebug.ExportedProperty(category = "layout") 2671 protected int mBottom; 2672 2673 /** 2674 * The offset, in pixels, by which the content of this view is scrolled 2675 * horizontally. 2676 * {@hide} 2677 */ 2678 @ViewDebug.ExportedProperty(category = "scrolling") 2679 protected int mScrollX; 2680 /** 2681 * The offset, in pixels, by which the content of this view is scrolled 2682 * vertically. 2683 * {@hide} 2684 */ 2685 @ViewDebug.ExportedProperty(category = "scrolling") 2686 protected int mScrollY; 2687 2688 /** 2689 * The left padding in pixels, that is the distance in pixels between the 2690 * left edge of this view and the left edge of its content. 2691 * {@hide} 2692 */ 2693 @ViewDebug.ExportedProperty(category = "padding") 2694 protected int mPaddingLeft; 2695 /** 2696 * The right padding in pixels, that is the distance in pixels between the 2697 * right edge of this view and the right edge of its content. 2698 * {@hide} 2699 */ 2700 @ViewDebug.ExportedProperty(category = "padding") 2701 protected int mPaddingRight; 2702 /** 2703 * The top padding in pixels, that is the distance in pixels between the 2704 * top edge of this view and the top edge of its content. 2705 * {@hide} 2706 */ 2707 @ViewDebug.ExportedProperty(category = "padding") 2708 protected int mPaddingTop; 2709 /** 2710 * The bottom padding in pixels, that is the distance in pixels between the 2711 * bottom edge of this view and the bottom edge of its content. 2712 * {@hide} 2713 */ 2714 @ViewDebug.ExportedProperty(category = "padding") 2715 protected int mPaddingBottom; 2716 2717 /** 2718 * The layout insets in pixels, that is the distance in pixels between the 2719 * visible edges of this view its bounds. 2720 */ 2721 private Insets mLayoutInsets; 2722 2723 /** 2724 * Briefly describes the view and is primarily used for accessibility support. 2725 */ 2726 private CharSequence mContentDescription; 2727 2728 /** 2729 * Cache the paddingRight set by the user to append to the scrollbar's size. 2730 * 2731 * @hide 2732 */ 2733 @ViewDebug.ExportedProperty(category = "padding") 2734 protected int mUserPaddingRight; 2735 2736 /** 2737 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2738 * 2739 * @hide 2740 */ 2741 @ViewDebug.ExportedProperty(category = "padding") 2742 protected int mUserPaddingBottom; 2743 2744 /** 2745 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2746 * 2747 * @hide 2748 */ 2749 @ViewDebug.ExportedProperty(category = "padding") 2750 protected int mUserPaddingLeft; 2751 2752 /** 2753 * Cache if the user padding is relative. 2754 * 2755 */ 2756 @ViewDebug.ExportedProperty(category = "padding") 2757 boolean mUserPaddingRelative; 2758 2759 /** 2760 * Cache the paddingStart set by the user to append to the scrollbar's size. 2761 * 2762 */ 2763 @ViewDebug.ExportedProperty(category = "padding") 2764 int mUserPaddingStart; 2765 2766 /** 2767 * Cache the paddingEnd set by the user to append to the scrollbar's size. 2768 * 2769 */ 2770 @ViewDebug.ExportedProperty(category = "padding") 2771 int mUserPaddingEnd; 2772 2773 /** 2774 * @hide 2775 */ 2776 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2777 /** 2778 * @hide 2779 */ 2780 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2781 2782 private Drawable mBackground; 2783 2784 private int mBackgroundResource; 2785 private boolean mBackgroundSizeChanged; 2786 2787 static class ListenerInfo { 2788 /** 2789 * Listener used to dispatch focus change events. 2790 * This field should be made private, so it is hidden from the SDK. 2791 * {@hide} 2792 */ 2793 protected OnFocusChangeListener mOnFocusChangeListener; 2794 2795 /** 2796 * Listeners for layout change events. 2797 */ 2798 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2799 2800 /** 2801 * Listeners for attach events. 2802 */ 2803 private CopyOnWriteArrayList<OnAttachStateChangeListener> mOnAttachStateChangeListeners; 2804 2805 /** 2806 * Listener used to dispatch click events. 2807 * This field should be made private, so it is hidden from the SDK. 2808 * {@hide} 2809 */ 2810 public OnClickListener mOnClickListener; 2811 2812 /** 2813 * Listener used to dispatch long click events. 2814 * This field should be made private, so it is hidden from the SDK. 2815 * {@hide} 2816 */ 2817 protected OnLongClickListener mOnLongClickListener; 2818 2819 /** 2820 * Listener used to build the context menu. 2821 * This field should be made private, so it is hidden from the SDK. 2822 * {@hide} 2823 */ 2824 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2825 2826 private OnKeyListener mOnKeyListener; 2827 2828 private OnTouchListener mOnTouchListener; 2829 2830 private OnHoverListener mOnHoverListener; 2831 2832 private OnGenericMotionListener mOnGenericMotionListener; 2833 2834 private OnDragListener mOnDragListener; 2835 2836 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2837 } 2838 2839 ListenerInfo mListenerInfo; 2840 2841 /** 2842 * The application environment this view lives in. 2843 * This field should be made private, so it is hidden from the SDK. 2844 * {@hide} 2845 */ 2846 protected Context mContext; 2847 2848 private final Resources mResources; 2849 2850 private ScrollabilityCache mScrollCache; 2851 2852 private int[] mDrawableState = null; 2853 2854 /** 2855 * Set to true when drawing cache is enabled and cannot be created. 2856 * 2857 * @hide 2858 */ 2859 public boolean mCachingFailed; 2860 2861 private Bitmap mDrawingCache; 2862 private Bitmap mUnscaledDrawingCache; 2863 private HardwareLayer mHardwareLayer; 2864 DisplayList mDisplayList; 2865 2866 /** 2867 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2868 * the user may specify which view to go to next. 2869 */ 2870 private int mNextFocusLeftId = View.NO_ID; 2871 2872 /** 2873 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2874 * the user may specify which view to go to next. 2875 */ 2876 private int mNextFocusRightId = View.NO_ID; 2877 2878 /** 2879 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2880 * the user may specify which view to go to next. 2881 */ 2882 private int mNextFocusUpId = View.NO_ID; 2883 2884 /** 2885 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2886 * the user may specify which view to go to next. 2887 */ 2888 private int mNextFocusDownId = View.NO_ID; 2889 2890 /** 2891 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2892 * the user may specify which view to go to next. 2893 */ 2894 int mNextFocusForwardId = View.NO_ID; 2895 2896 private CheckForLongPress mPendingCheckForLongPress; 2897 private CheckForTap mPendingCheckForTap = null; 2898 private PerformClick mPerformClick; 2899 private SendViewScrolledAccessibilityEvent mSendViewScrolledAccessibilityEvent; 2900 2901 private UnsetPressedState mUnsetPressedState; 2902 2903 /** 2904 * Whether the long press's action has been invoked. The tap's action is invoked on the 2905 * up event while a long press is invoked as soon as the long press duration is reached, so 2906 * a long press could be performed before the tap is checked, in which case the tap's action 2907 * should not be invoked. 2908 */ 2909 private boolean mHasPerformedLongPress; 2910 2911 /** 2912 * The minimum height of the view. We'll try our best to have the height 2913 * of this view to at least this amount. 2914 */ 2915 @ViewDebug.ExportedProperty(category = "measurement") 2916 private int mMinHeight; 2917 2918 /** 2919 * The minimum width of the view. We'll try our best to have the width 2920 * of this view to at least this amount. 2921 */ 2922 @ViewDebug.ExportedProperty(category = "measurement") 2923 private int mMinWidth; 2924 2925 /** 2926 * The delegate to handle touch events that are physically in this view 2927 * but should be handled by another view. 2928 */ 2929 private TouchDelegate mTouchDelegate = null; 2930 2931 /** 2932 * Solid color to use as a background when creating the drawing cache. Enables 2933 * the cache to use 16 bit bitmaps instead of 32 bit. 2934 */ 2935 private int mDrawingCacheBackgroundColor = 0; 2936 2937 /** 2938 * Special tree observer used when mAttachInfo is null. 2939 */ 2940 private ViewTreeObserver mFloatingTreeObserver; 2941 2942 /** 2943 * Cache the touch slop from the context that created the view. 2944 */ 2945 private int mTouchSlop; 2946 2947 /** 2948 * Object that handles automatic animation of view properties. 2949 */ 2950 private ViewPropertyAnimator mAnimator = null; 2951 2952 /** 2953 * Flag indicating that a drag can cross window boundaries. When 2954 * {@link #startDrag(ClipData, DragShadowBuilder, Object, int)} is called 2955 * with this flag set, all visible applications will be able to participate 2956 * in the drag operation and receive the dragged content. 2957 * 2958 * @hide 2959 */ 2960 public static final int DRAG_FLAG_GLOBAL = 1; 2961 2962 /** 2963 * Vertical scroll factor cached by {@link #getVerticalScrollFactor}. 2964 */ 2965 private float mVerticalScrollFactor; 2966 2967 /** 2968 * Position of the vertical scroll bar. 2969 */ 2970 private int mVerticalScrollbarPosition; 2971 2972 /** 2973 * Position the scroll bar at the default position as determined by the system. 2974 */ 2975 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2976 2977 /** 2978 * Position the scroll bar along the left edge. 2979 */ 2980 public static final int SCROLLBAR_POSITION_LEFT = 1; 2981 2982 /** 2983 * Position the scroll bar along the right edge. 2984 */ 2985 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2986 2987 /** 2988 * Indicates that the view does not have a layer. 2989 * 2990 * @see #getLayerType() 2991 * @see #setLayerType(int, android.graphics.Paint) 2992 * @see #LAYER_TYPE_SOFTWARE 2993 * @see #LAYER_TYPE_HARDWARE 2994 */ 2995 public static final int LAYER_TYPE_NONE = 0; 2996 2997 /** 2998 * <p>Indicates that the view has a software layer. A software layer is backed 2999 * by a bitmap and causes the view to be rendered using Android's software 3000 * rendering pipeline, even if hardware acceleration is enabled.</p> 3001 * 3002 * <p>Software layers have various usages:</p> 3003 * <p>When the application is not using hardware acceleration, a software layer 3004 * is useful to apply a specific color filter and/or blending mode and/or 3005 * translucency to a view and all its children.</p> 3006 * <p>When the application is using hardware acceleration, a software layer 3007 * is useful to render drawing primitives not supported by the hardware 3008 * accelerated pipeline. It can also be used to cache a complex view tree 3009 * into a texture and reduce the complexity of drawing operations. For instance, 3010 * when animating a complex view tree with a translation, a software layer can 3011 * be used to render the view tree only once.</p> 3012 * <p>Software layers should be avoided when the affected view tree updates 3013 * often. Every update will require to re-render the software layer, which can 3014 * potentially be slow (particularly when hardware acceleration is turned on 3015 * since the layer will have to be uploaded into a hardware texture after every 3016 * update.)</p> 3017 * 3018 * @see #getLayerType() 3019 * @see #setLayerType(int, android.graphics.Paint) 3020 * @see #LAYER_TYPE_NONE 3021 * @see #LAYER_TYPE_HARDWARE 3022 */ 3023 public static final int LAYER_TYPE_SOFTWARE = 1; 3024 3025 /** 3026 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 3027 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 3028 * OpenGL hardware) and causes the view to be rendered using Android's hardware 3029 * rendering pipeline, but only if hardware acceleration is turned on for the 3030 * view hierarchy. When hardware acceleration is turned off, hardware layers 3031 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 3032 * 3033 * <p>A hardware layer is useful to apply a specific color filter and/or 3034 * blending mode and/or translucency to a view and all its children.</p> 3035 * <p>A hardware layer can be used to cache a complex view tree into a 3036 * texture and reduce the complexity of drawing operations. For instance, 3037 * when animating a complex view tree with a translation, a hardware layer can 3038 * be used to render the view tree only once.</p> 3039 * <p>A hardware layer can also be used to increase the rendering quality when 3040 * rotation transformations are applied on a view. It can also be used to 3041 * prevent potential clipping issues when applying 3D transforms on a view.</p> 3042 * 3043 * @see #getLayerType() 3044 * @see #setLayerType(int, android.graphics.Paint) 3045 * @see #LAYER_TYPE_NONE 3046 * @see #LAYER_TYPE_SOFTWARE 3047 */ 3048 public static final int LAYER_TYPE_HARDWARE = 2; 3049 3050 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 3051 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 3052 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 3053 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 3054 }) 3055 int mLayerType = LAYER_TYPE_NONE; 3056 Paint mLayerPaint; 3057 Rect mLocalDirtyRect; 3058 3059 /** 3060 * Set to true when the view is sending hover accessibility events because it 3061 * is the innermost hovered view. 3062 */ 3063 private boolean mSendingHoverAccessibilityEvents; 3064 3065 /** 3066 * Simple constructor to use when creating a view from code. 3067 * 3068 * @param context The Context the view is running in, through which it can 3069 * access the current theme, resources, etc. 3070 */ 3071 public View(Context context) { 3072 mContext = context; 3073 mResources = context != null ? context.getResources() : null; 3074 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 3075 // Set layout and text direction defaults 3076 mPrivateFlags2 = (LAYOUT_DIRECTION_DEFAULT << LAYOUT_DIRECTION_MASK_SHIFT) | 3077 (TEXT_DIRECTION_DEFAULT << TEXT_DIRECTION_MASK_SHIFT) | 3078 (TEXT_ALIGNMENT_DEFAULT << TEXT_ALIGNMENT_MASK_SHIFT) | 3079 (IMPORTANT_FOR_ACCESSIBILITY_DEFAULT << IMPORTANT_FOR_ACCESSIBILITY_SHIFT); 3080 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 3081 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 3082 mUserPaddingStart = -1; 3083 mUserPaddingEnd = -1; 3084 mUserPaddingRelative = false; 3085 } 3086 3087 /** 3088 * Delegate for injecting accessiblity functionality. 3089 */ 3090 AccessibilityDelegate mAccessibilityDelegate; 3091 3092 /** 3093 * Consistency verifier for debugging purposes. 3094 * @hide 3095 */ 3096 protected final InputEventConsistencyVerifier mInputEventConsistencyVerifier = 3097 InputEventConsistencyVerifier.isInstrumentationEnabled() ? 3098 new InputEventConsistencyVerifier(this, 0) : null; 3099 3100 /** 3101 * Constructor that is called when inflating a view from XML. This is called 3102 * when a view is being constructed from an XML file, supplying attributes 3103 * that were specified in the XML file. This version uses a default style of 3104 * 0, so the only attribute values applied are those in the Context's Theme 3105 * and the given AttributeSet. 3106 * 3107 * <p> 3108 * The method onFinishInflate() will be called after all children have been 3109 * added. 3110 * 3111 * @param context The Context the view is running in, through which it can 3112 * access the current theme, resources, etc. 3113 * @param attrs The attributes of the XML tag that is inflating the view. 3114 * @see #View(Context, AttributeSet, int) 3115 */ 3116 public View(Context context, AttributeSet attrs) { 3117 this(context, attrs, 0); 3118 } 3119 3120 /** 3121 * Perform inflation from XML and apply a class-specific base style. This 3122 * constructor of View allows subclasses to use their own base style when 3123 * they are inflating. For example, a Button class's constructor would call 3124 * this version of the super class constructor and supply 3125 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 3126 * the theme's button style to modify all of the base view attributes (in 3127 * particular its background) as well as the Button class's attributes. 3128 * 3129 * @param context The Context the view is running in, through which it can 3130 * access the current theme, resources, etc. 3131 * @param attrs The attributes of the XML tag that is inflating the view. 3132 * @param defStyle The default style to apply to this view. If 0, no style 3133 * will be applied (beyond what is included in the theme). This may 3134 * either be an attribute resource, whose value will be retrieved 3135 * from the current theme, or an explicit style resource. 3136 * @see #View(Context, AttributeSet) 3137 */ 3138 public View(Context context, AttributeSet attrs, int defStyle) { 3139 this(context); 3140 3141 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 3142 defStyle, 0); 3143 3144 Drawable background = null; 3145 3146 int leftPadding = -1; 3147 int topPadding = -1; 3148 int rightPadding = -1; 3149 int bottomPadding = -1; 3150 int startPadding = -1; 3151 int endPadding = -1; 3152 3153 int padding = -1; 3154 3155 int viewFlagValues = 0; 3156 int viewFlagMasks = 0; 3157 3158 boolean setScrollContainer = false; 3159 3160 int x = 0; 3161 int y = 0; 3162 3163 float tx = 0; 3164 float ty = 0; 3165 float rotation = 0; 3166 float rotationX = 0; 3167 float rotationY = 0; 3168 float sx = 1f; 3169 float sy = 1f; 3170 boolean transformSet = false; 3171 3172 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 3173 3174 int overScrollMode = mOverScrollMode; 3175 final int N = a.getIndexCount(); 3176 for (int i = 0; i < N; i++) { 3177 int attr = a.getIndex(i); 3178 switch (attr) { 3179 case com.android.internal.R.styleable.View_background: 3180 background = a.getDrawable(attr); 3181 break; 3182 case com.android.internal.R.styleable.View_padding: 3183 padding = a.getDimensionPixelSize(attr, -1); 3184 break; 3185 case com.android.internal.R.styleable.View_paddingLeft: 3186 leftPadding = a.getDimensionPixelSize(attr, -1); 3187 break; 3188 case com.android.internal.R.styleable.View_paddingTop: 3189 topPadding = a.getDimensionPixelSize(attr, -1); 3190 break; 3191 case com.android.internal.R.styleable.View_paddingRight: 3192 rightPadding = a.getDimensionPixelSize(attr, -1); 3193 break; 3194 case com.android.internal.R.styleable.View_paddingBottom: 3195 bottomPadding = a.getDimensionPixelSize(attr, -1); 3196 break; 3197 case com.android.internal.R.styleable.View_paddingStart: 3198 startPadding = a.getDimensionPixelSize(attr, -1); 3199 break; 3200 case com.android.internal.R.styleable.View_paddingEnd: 3201 endPadding = a.getDimensionPixelSize(attr, -1); 3202 break; 3203 case com.android.internal.R.styleable.View_scrollX: 3204 x = a.getDimensionPixelOffset(attr, 0); 3205 break; 3206 case com.android.internal.R.styleable.View_scrollY: 3207 y = a.getDimensionPixelOffset(attr, 0); 3208 break; 3209 case com.android.internal.R.styleable.View_alpha: 3210 setAlpha(a.getFloat(attr, 1f)); 3211 break; 3212 case com.android.internal.R.styleable.View_transformPivotX: 3213 setPivotX(a.getDimensionPixelOffset(attr, 0)); 3214 break; 3215 case com.android.internal.R.styleable.View_transformPivotY: 3216 setPivotY(a.getDimensionPixelOffset(attr, 0)); 3217 break; 3218 case com.android.internal.R.styleable.View_translationX: 3219 tx = a.getDimensionPixelOffset(attr, 0); 3220 transformSet = true; 3221 break; 3222 case com.android.internal.R.styleable.View_translationY: 3223 ty = a.getDimensionPixelOffset(attr, 0); 3224 transformSet = true; 3225 break; 3226 case com.android.internal.R.styleable.View_rotation: 3227 rotation = a.getFloat(attr, 0); 3228 transformSet = true; 3229 break; 3230 case com.android.internal.R.styleable.View_rotationX: 3231 rotationX = a.getFloat(attr, 0); 3232 transformSet = true; 3233 break; 3234 case com.android.internal.R.styleable.View_rotationY: 3235 rotationY = a.getFloat(attr, 0); 3236 transformSet = true; 3237 break; 3238 case com.android.internal.R.styleable.View_scaleX: 3239 sx = a.getFloat(attr, 1f); 3240 transformSet = true; 3241 break; 3242 case com.android.internal.R.styleable.View_scaleY: 3243 sy = a.getFloat(attr, 1f); 3244 transformSet = true; 3245 break; 3246 case com.android.internal.R.styleable.View_id: 3247 mID = a.getResourceId(attr, NO_ID); 3248 break; 3249 case com.android.internal.R.styleable.View_tag: 3250 mTag = a.getText(attr); 3251 break; 3252 case com.android.internal.R.styleable.View_fitsSystemWindows: 3253 if (a.getBoolean(attr, false)) { 3254 viewFlagValues |= FITS_SYSTEM_WINDOWS; 3255 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 3256 } 3257 break; 3258 case com.android.internal.R.styleable.View_focusable: 3259 if (a.getBoolean(attr, false)) { 3260 viewFlagValues |= FOCUSABLE; 3261 viewFlagMasks |= FOCUSABLE_MASK; 3262 } 3263 break; 3264 case com.android.internal.R.styleable.View_focusableInTouchMode: 3265 if (a.getBoolean(attr, false)) { 3266 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 3267 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 3268 } 3269 break; 3270 case com.android.internal.R.styleable.View_clickable: 3271 if (a.getBoolean(attr, false)) { 3272 viewFlagValues |= CLICKABLE; 3273 viewFlagMasks |= CLICKABLE; 3274 } 3275 break; 3276 case com.android.internal.R.styleable.View_longClickable: 3277 if (a.getBoolean(attr, false)) { 3278 viewFlagValues |= LONG_CLICKABLE; 3279 viewFlagMasks |= LONG_CLICKABLE; 3280 } 3281 break; 3282 case com.android.internal.R.styleable.View_saveEnabled: 3283 if (!a.getBoolean(attr, true)) { 3284 viewFlagValues |= SAVE_DISABLED; 3285 viewFlagMasks |= SAVE_DISABLED_MASK; 3286 } 3287 break; 3288 case com.android.internal.R.styleable.View_duplicateParentState: 3289 if (a.getBoolean(attr, false)) { 3290 viewFlagValues |= DUPLICATE_PARENT_STATE; 3291 viewFlagMasks |= DUPLICATE_PARENT_STATE; 3292 } 3293 break; 3294 case com.android.internal.R.styleable.View_visibility: 3295 final int visibility = a.getInt(attr, 0); 3296 if (visibility != 0) { 3297 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 3298 viewFlagMasks |= VISIBILITY_MASK; 3299 } 3300 break; 3301 case com.android.internal.R.styleable.View_layoutDirection: 3302 // Clear any layout direction flags (included resolved bits) already set 3303 mPrivateFlags2 &= ~(LAYOUT_DIRECTION_MASK | LAYOUT_DIRECTION_RESOLVED_MASK); 3304 // Set the layout direction flags depending on the value of the attribute 3305 final int layoutDirection = a.getInt(attr, -1); 3306 final int value = (layoutDirection != -1) ? 3307 LAYOUT_DIRECTION_FLAGS[layoutDirection] : LAYOUT_DIRECTION_DEFAULT; 3308 mPrivateFlags2 |= (value << LAYOUT_DIRECTION_MASK_SHIFT); 3309 break; 3310 case com.android.internal.R.styleable.View_drawingCacheQuality: 3311 final int cacheQuality = a.getInt(attr, 0); 3312 if (cacheQuality != 0) { 3313 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 3314 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 3315 } 3316 break; 3317 case com.android.internal.R.styleable.View_contentDescription: 3318 mContentDescription = a.getString(attr); 3319 break; 3320 case com.android.internal.R.styleable.View_soundEffectsEnabled: 3321 if (!a.getBoolean(attr, true)) { 3322 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 3323 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 3324 } 3325 break; 3326 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 3327 if (!a.getBoolean(attr, true)) { 3328 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 3329 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 3330 } 3331 break; 3332 case R.styleable.View_scrollbars: 3333 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 3334 if (scrollbars != SCROLLBARS_NONE) { 3335 viewFlagValues |= scrollbars; 3336 viewFlagMasks |= SCROLLBARS_MASK; 3337 initializeScrollbars(a); 3338 } 3339 break; 3340 //noinspection deprecation 3341 case R.styleable.View_fadingEdge: 3342 if (context.getApplicationInfo().targetSdkVersion >= ICE_CREAM_SANDWICH) { 3343 // Ignore the attribute starting with ICS 3344 break; 3345 } 3346 // With builds < ICS, fall through and apply fading edges 3347 case R.styleable.View_requiresFadingEdge: 3348 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 3349 if (fadingEdge != FADING_EDGE_NONE) { 3350 viewFlagValues |= fadingEdge; 3351 viewFlagMasks |= FADING_EDGE_MASK; 3352 initializeFadingEdge(a); 3353 } 3354 break; 3355 case R.styleable.View_scrollbarStyle: 3356 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 3357 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3358 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 3359 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 3360 } 3361 break; 3362 case R.styleable.View_isScrollContainer: 3363 setScrollContainer = true; 3364 if (a.getBoolean(attr, false)) { 3365 setScrollContainer(true); 3366 } 3367 break; 3368 case com.android.internal.R.styleable.View_keepScreenOn: 3369 if (a.getBoolean(attr, false)) { 3370 viewFlagValues |= KEEP_SCREEN_ON; 3371 viewFlagMasks |= KEEP_SCREEN_ON; 3372 } 3373 break; 3374 case R.styleable.View_filterTouchesWhenObscured: 3375 if (a.getBoolean(attr, false)) { 3376 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 3377 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 3378 } 3379 break; 3380 case R.styleable.View_nextFocusLeft: 3381 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 3382 break; 3383 case R.styleable.View_nextFocusRight: 3384 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 3385 break; 3386 case R.styleable.View_nextFocusUp: 3387 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 3388 break; 3389 case R.styleable.View_nextFocusDown: 3390 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 3391 break; 3392 case R.styleable.View_nextFocusForward: 3393 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 3394 break; 3395 case R.styleable.View_minWidth: 3396 mMinWidth = a.getDimensionPixelSize(attr, 0); 3397 break; 3398 case R.styleable.View_minHeight: 3399 mMinHeight = a.getDimensionPixelSize(attr, 0); 3400 break; 3401 case R.styleable.View_onClick: 3402 if (context.isRestricted()) { 3403 throw new IllegalStateException("The android:onClick attribute cannot " 3404 + "be used within a restricted context"); 3405 } 3406 3407 final String handlerName = a.getString(attr); 3408 if (handlerName != null) { 3409 setOnClickListener(new OnClickListener() { 3410 private Method mHandler; 3411 3412 public void onClick(View v) { 3413 if (mHandler == null) { 3414 try { 3415 mHandler = getContext().getClass().getMethod(handlerName, 3416 View.class); 3417 } catch (NoSuchMethodException e) { 3418 int id = getId(); 3419 String idText = id == NO_ID ? "" : " with id '" 3420 + getContext().getResources().getResourceEntryName( 3421 id) + "'"; 3422 throw new IllegalStateException("Could not find a method " + 3423 handlerName + "(View) in the activity " 3424 + getContext().getClass() + " for onClick handler" 3425 + " on view " + View.this.getClass() + idText, e); 3426 } 3427 } 3428 3429 try { 3430 mHandler.invoke(getContext(), View.this); 3431 } catch (IllegalAccessException e) { 3432 throw new IllegalStateException("Could not execute non " 3433 + "public method of the activity", e); 3434 } catch (InvocationTargetException e) { 3435 throw new IllegalStateException("Could not execute " 3436 + "method of the activity", e); 3437 } 3438 } 3439 }); 3440 } 3441 break; 3442 case R.styleable.View_overScrollMode: 3443 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 3444 break; 3445 case R.styleable.View_verticalScrollbarPosition: 3446 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 3447 break; 3448 case R.styleable.View_layerType: 3449 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 3450 break; 3451 case R.styleable.View_textDirection: 3452 // Clear any text direction flag already set 3453 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 3454 // Set the text direction flags depending on the value of the attribute 3455 final int textDirection = a.getInt(attr, -1); 3456 if (textDirection != -1) { 3457 mPrivateFlags2 |= TEXT_DIRECTION_FLAGS[textDirection]; 3458 } 3459 break; 3460 case R.styleable.View_textAlignment: 3461 // Clear any text alignment flag already set 3462 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 3463 // Set the text alignment flag depending on the value of the attribute 3464 final int textAlignment = a.getInt(attr, TEXT_ALIGNMENT_DEFAULT); 3465 mPrivateFlags2 |= TEXT_ALIGNMENT_FLAGS[textAlignment]; 3466 break; 3467 case R.styleable.View_importantForAccessibility: 3468 setImportantForAccessibility(a.getInt(attr, 3469 IMPORTANT_FOR_ACCESSIBILITY_DEFAULT)); 3470 } 3471 } 3472 3473 a.recycle(); 3474 3475 setOverScrollMode(overScrollMode); 3476 3477 if (background != null) { 3478 setBackground(background); 3479 } 3480 3481 // Cache user padding as we cannot fully resolve padding here (we dont have yet the resolved 3482 // layout direction). Those cached values will be used later during padding resolution. 3483 mUserPaddingStart = startPadding; 3484 mUserPaddingEnd = endPadding; 3485 3486 updateUserPaddingRelative(); 3487 3488 if (padding >= 0) { 3489 leftPadding = padding; 3490 topPadding = padding; 3491 rightPadding = padding; 3492 bottomPadding = padding; 3493 } 3494 3495 // If the user specified the padding (either with android:padding or 3496 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 3497 // use the default padding or the padding from the background drawable 3498 // (stored at this point in mPadding*) 3499 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 3500 topPadding >= 0 ? topPadding : mPaddingTop, 3501 rightPadding >= 0 ? rightPadding : mPaddingRight, 3502 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 3503 3504 if (viewFlagMasks != 0) { 3505 setFlags(viewFlagValues, viewFlagMasks); 3506 } 3507 3508 // Needs to be called after mViewFlags is set 3509 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 3510 recomputePadding(); 3511 } 3512 3513 if (x != 0 || y != 0) { 3514 scrollTo(x, y); 3515 } 3516 3517 if (transformSet) { 3518 setTranslationX(tx); 3519 setTranslationY(ty); 3520 setRotation(rotation); 3521 setRotationX(rotationX); 3522 setRotationY(rotationY); 3523 setScaleX(sx); 3524 setScaleY(sy); 3525 } 3526 3527 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 3528 setScrollContainer(true); 3529 } 3530 3531 computeOpaqueFlags(); 3532 } 3533 3534 private void updateUserPaddingRelative() { 3535 mUserPaddingRelative = (mUserPaddingStart >= 0 || mUserPaddingEnd >= 0); 3536 } 3537 3538 /** 3539 * Non-public constructor for use in testing 3540 */ 3541 View() { 3542 mResources = null; 3543 } 3544 3545 /** 3546 * <p> 3547 * Initializes the fading edges from a given set of styled attributes. This 3548 * method should be called by subclasses that need fading edges and when an 3549 * instance of these subclasses is created programmatically rather than 3550 * being inflated from XML. This method is automatically called when the XML 3551 * is inflated. 3552 * </p> 3553 * 3554 * @param a the styled attributes set to initialize the fading edges from 3555 */ 3556 protected void initializeFadingEdge(TypedArray a) { 3557 initScrollCache(); 3558 3559 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 3560 R.styleable.View_fadingEdgeLength, 3561 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 3562 } 3563 3564 /** 3565 * Returns the size of the vertical faded edges used to indicate that more 3566 * content in this view is visible. 3567 * 3568 * @return The size in pixels of the vertical faded edge or 0 if vertical 3569 * faded edges are not enabled for this view. 3570 * @attr ref android.R.styleable#View_fadingEdgeLength 3571 */ 3572 public int getVerticalFadingEdgeLength() { 3573 if (isVerticalFadingEdgeEnabled()) { 3574 ScrollabilityCache cache = mScrollCache; 3575 if (cache != null) { 3576 return cache.fadingEdgeLength; 3577 } 3578 } 3579 return 0; 3580 } 3581 3582 /** 3583 * Set the size of the faded edge used to indicate that more content in this 3584 * view is available. Will not change whether the fading edge is enabled; use 3585 * {@link #setVerticalFadingEdgeEnabled(boolean)} or 3586 * {@link #setHorizontalFadingEdgeEnabled(boolean)} to enable the fading edge 3587 * for the vertical or horizontal fading edges. 3588 * 3589 * @param length The size in pixels of the faded edge used to indicate that more 3590 * content in this view is visible. 3591 */ 3592 public void setFadingEdgeLength(int length) { 3593 initScrollCache(); 3594 mScrollCache.fadingEdgeLength = length; 3595 } 3596 3597 /** 3598 * Returns the size of the horizontal faded edges used to indicate that more 3599 * content in this view is visible. 3600 * 3601 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 3602 * faded edges are not enabled for this view. 3603 * @attr ref android.R.styleable#View_fadingEdgeLength 3604 */ 3605 public int getHorizontalFadingEdgeLength() { 3606 if (isHorizontalFadingEdgeEnabled()) { 3607 ScrollabilityCache cache = mScrollCache; 3608 if (cache != null) { 3609 return cache.fadingEdgeLength; 3610 } 3611 } 3612 return 0; 3613 } 3614 3615 /** 3616 * Returns the width of the vertical scrollbar. 3617 * 3618 * @return The width in pixels of the vertical scrollbar or 0 if there 3619 * is no vertical scrollbar. 3620 */ 3621 public int getVerticalScrollbarWidth() { 3622 ScrollabilityCache cache = mScrollCache; 3623 if (cache != null) { 3624 ScrollBarDrawable scrollBar = cache.scrollBar; 3625 if (scrollBar != null) { 3626 int size = scrollBar.getSize(true); 3627 if (size <= 0) { 3628 size = cache.scrollBarSize; 3629 } 3630 return size; 3631 } 3632 return 0; 3633 } 3634 return 0; 3635 } 3636 3637 /** 3638 * Returns the height of the horizontal scrollbar. 3639 * 3640 * @return The height in pixels of the horizontal scrollbar or 0 if 3641 * there is no horizontal scrollbar. 3642 */ 3643 protected int getHorizontalScrollbarHeight() { 3644 ScrollabilityCache cache = mScrollCache; 3645 if (cache != null) { 3646 ScrollBarDrawable scrollBar = cache.scrollBar; 3647 if (scrollBar != null) { 3648 int size = scrollBar.getSize(false); 3649 if (size <= 0) { 3650 size = cache.scrollBarSize; 3651 } 3652 return size; 3653 } 3654 return 0; 3655 } 3656 return 0; 3657 } 3658 3659 /** 3660 * <p> 3661 * Initializes the scrollbars from a given set of styled attributes. This 3662 * method should be called by subclasses that need scrollbars and when an 3663 * instance of these subclasses is created programmatically rather than 3664 * being inflated from XML. This method is automatically called when the XML 3665 * is inflated. 3666 * </p> 3667 * 3668 * @param a the styled attributes set to initialize the scrollbars from 3669 */ 3670 protected void initializeScrollbars(TypedArray a) { 3671 initScrollCache(); 3672 3673 final ScrollabilityCache scrollabilityCache = mScrollCache; 3674 3675 if (scrollabilityCache.scrollBar == null) { 3676 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 3677 } 3678 3679 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 3680 3681 if (!fadeScrollbars) { 3682 scrollabilityCache.state = ScrollabilityCache.ON; 3683 } 3684 scrollabilityCache.fadeScrollBars = fadeScrollbars; 3685 3686 3687 scrollabilityCache.scrollBarFadeDuration = a.getInt( 3688 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 3689 .getScrollBarFadeDuration()); 3690 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 3691 R.styleable.View_scrollbarDefaultDelayBeforeFade, 3692 ViewConfiguration.getScrollDefaultDelay()); 3693 3694 3695 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 3696 com.android.internal.R.styleable.View_scrollbarSize, 3697 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 3698 3699 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 3700 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 3701 3702 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 3703 if (thumb != null) { 3704 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 3705 } 3706 3707 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 3708 false); 3709 if (alwaysDraw) { 3710 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 3711 } 3712 3713 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 3714 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 3715 3716 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 3717 if (thumb != null) { 3718 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 3719 } 3720 3721 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 3722 false); 3723 if (alwaysDraw) { 3724 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 3725 } 3726 3727 // Re-apply user/background padding so that scrollbar(s) get added 3728 resolvePadding(); 3729 } 3730 3731 /** 3732 * <p> 3733 * Initalizes the scrollability cache if necessary. 3734 * </p> 3735 */ 3736 private void initScrollCache() { 3737 if (mScrollCache == null) { 3738 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 3739 } 3740 } 3741 3742 private ScrollabilityCache getScrollCache() { 3743 initScrollCache(); 3744 return mScrollCache; 3745 } 3746 3747 /** 3748 * Set the position of the vertical scroll bar. Should be one of 3749 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 3750 * {@link #SCROLLBAR_POSITION_RIGHT}. 3751 * 3752 * @param position Where the vertical scroll bar should be positioned. 3753 */ 3754 public void setVerticalScrollbarPosition(int position) { 3755 if (mVerticalScrollbarPosition != position) { 3756 mVerticalScrollbarPosition = position; 3757 computeOpaqueFlags(); 3758 resolvePadding(); 3759 } 3760 } 3761 3762 /** 3763 * @return The position where the vertical scroll bar will show, if applicable. 3764 * @see #setVerticalScrollbarPosition(int) 3765 */ 3766 public int getVerticalScrollbarPosition() { 3767 return mVerticalScrollbarPosition; 3768 } 3769 3770 ListenerInfo getListenerInfo() { 3771 if (mListenerInfo != null) { 3772 return mListenerInfo; 3773 } 3774 mListenerInfo = new ListenerInfo(); 3775 return mListenerInfo; 3776 } 3777 3778 /** 3779 * Register a callback to be invoked when focus of this view changed. 3780 * 3781 * @param l The callback that will run. 3782 */ 3783 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3784 getListenerInfo().mOnFocusChangeListener = l; 3785 } 3786 3787 /** 3788 * Add a listener that will be called when the bounds of the view change due to 3789 * layout processing. 3790 * 3791 * @param listener The listener that will be called when layout bounds change. 3792 */ 3793 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3794 ListenerInfo li = getListenerInfo(); 3795 if (li.mOnLayoutChangeListeners == null) { 3796 li.mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3797 } 3798 if (!li.mOnLayoutChangeListeners.contains(listener)) { 3799 li.mOnLayoutChangeListeners.add(listener); 3800 } 3801 } 3802 3803 /** 3804 * Remove a listener for layout changes. 3805 * 3806 * @param listener The listener for layout bounds change. 3807 */ 3808 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3809 ListenerInfo li = mListenerInfo; 3810 if (li == null || li.mOnLayoutChangeListeners == null) { 3811 return; 3812 } 3813 li.mOnLayoutChangeListeners.remove(listener); 3814 } 3815 3816 /** 3817 * Add a listener for attach state changes. 3818 * 3819 * This listener will be called whenever this view is attached or detached 3820 * from a window. Remove the listener using 3821 * {@link #removeOnAttachStateChangeListener(OnAttachStateChangeListener)}. 3822 * 3823 * @param listener Listener to attach 3824 * @see #removeOnAttachStateChangeListener(OnAttachStateChangeListener) 3825 */ 3826 public void addOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3827 ListenerInfo li = getListenerInfo(); 3828 if (li.mOnAttachStateChangeListeners == null) { 3829 li.mOnAttachStateChangeListeners 3830 = new CopyOnWriteArrayList<OnAttachStateChangeListener>(); 3831 } 3832 li.mOnAttachStateChangeListeners.add(listener); 3833 } 3834 3835 /** 3836 * Remove a listener for attach state changes. The listener will receive no further 3837 * notification of window attach/detach events. 3838 * 3839 * @param listener Listener to remove 3840 * @see #addOnAttachStateChangeListener(OnAttachStateChangeListener) 3841 */ 3842 public void removeOnAttachStateChangeListener(OnAttachStateChangeListener listener) { 3843 ListenerInfo li = mListenerInfo; 3844 if (li == null || li.mOnAttachStateChangeListeners == null) { 3845 return; 3846 } 3847 li.mOnAttachStateChangeListeners.remove(listener); 3848 } 3849 3850 /** 3851 * Returns the focus-change callback registered for this view. 3852 * 3853 * @return The callback, or null if one is not registered. 3854 */ 3855 public OnFocusChangeListener getOnFocusChangeListener() { 3856 ListenerInfo li = mListenerInfo; 3857 return li != null ? li.mOnFocusChangeListener : null; 3858 } 3859 3860 /** 3861 * Register a callback to be invoked when this view is clicked. If this view is not 3862 * clickable, it becomes clickable. 3863 * 3864 * @param l The callback that will run 3865 * 3866 * @see #setClickable(boolean) 3867 */ 3868 public void setOnClickListener(OnClickListener l) { 3869 if (!isClickable()) { 3870 setClickable(true); 3871 } 3872 getListenerInfo().mOnClickListener = l; 3873 } 3874 3875 /** 3876 * Return whether this view has an attached OnClickListener. Returns 3877 * true if there is a listener, false if there is none. 3878 */ 3879 public boolean hasOnClickListeners() { 3880 ListenerInfo li = mListenerInfo; 3881 return (li != null && li.mOnClickListener != null); 3882 } 3883 3884 /** 3885 * Register a callback to be invoked when this view is clicked and held. If this view is not 3886 * long clickable, it becomes long clickable. 3887 * 3888 * @param l The callback that will run 3889 * 3890 * @see #setLongClickable(boolean) 3891 */ 3892 public void setOnLongClickListener(OnLongClickListener l) { 3893 if (!isLongClickable()) { 3894 setLongClickable(true); 3895 } 3896 getListenerInfo().mOnLongClickListener = l; 3897 } 3898 3899 /** 3900 * Register a callback to be invoked when the context menu for this view is 3901 * being built. If this view is not long clickable, it becomes long clickable. 3902 * 3903 * @param l The callback that will run 3904 * 3905 */ 3906 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3907 if (!isLongClickable()) { 3908 setLongClickable(true); 3909 } 3910 getListenerInfo().mOnCreateContextMenuListener = l; 3911 } 3912 3913 /** 3914 * Call this view's OnClickListener, if it is defined. Performs all normal 3915 * actions associated with clicking: reporting accessibility event, playing 3916 * a sound, etc. 3917 * 3918 * @return True there was an assigned OnClickListener that was called, false 3919 * otherwise is returned. 3920 */ 3921 public boolean performClick() { 3922 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3923 3924 ListenerInfo li = mListenerInfo; 3925 if (li != null && li.mOnClickListener != null) { 3926 playSoundEffect(SoundEffectConstants.CLICK); 3927 li.mOnClickListener.onClick(this); 3928 return true; 3929 } 3930 3931 return false; 3932 } 3933 3934 /** 3935 * Directly call any attached OnClickListener. Unlike {@link #performClick()}, 3936 * this only calls the listener, and does not do any associated clicking 3937 * actions like reporting an accessibility event. 3938 * 3939 * @return True there was an assigned OnClickListener that was called, false 3940 * otherwise is returned. 3941 */ 3942 public boolean callOnClick() { 3943 ListenerInfo li = mListenerInfo; 3944 if (li != null && li.mOnClickListener != null) { 3945 li.mOnClickListener.onClick(this); 3946 return true; 3947 } 3948 return false; 3949 } 3950 3951 /** 3952 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3953 * OnLongClickListener did not consume the event. 3954 * 3955 * @return True if one of the above receivers consumed the event, false otherwise. 3956 */ 3957 public boolean performLongClick() { 3958 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3959 3960 boolean handled = false; 3961 ListenerInfo li = mListenerInfo; 3962 if (li != null && li.mOnLongClickListener != null) { 3963 handled = li.mOnLongClickListener.onLongClick(View.this); 3964 } 3965 if (!handled) { 3966 handled = showContextMenu(); 3967 } 3968 if (handled) { 3969 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3970 } 3971 return handled; 3972 } 3973 3974 /** 3975 * Performs button-related actions during a touch down event. 3976 * 3977 * @param event The event. 3978 * @return True if the down was consumed. 3979 * 3980 * @hide 3981 */ 3982 protected boolean performButtonActionOnTouchDown(MotionEvent event) { 3983 if ((event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) { 3984 if (showContextMenu(event.getX(), event.getY(), event.getMetaState())) { 3985 return true; 3986 } 3987 } 3988 return false; 3989 } 3990 3991 /** 3992 * Bring up the context menu for this view. 3993 * 3994 * @return Whether a context menu was displayed. 3995 */ 3996 public boolean showContextMenu() { 3997 return getParent().showContextMenuForChild(this); 3998 } 3999 4000 /** 4001 * Bring up the context menu for this view, referring to the item under the specified point. 4002 * 4003 * @param x The referenced x coordinate. 4004 * @param y The referenced y coordinate. 4005 * @param metaState The keyboard modifiers that were pressed. 4006 * @return Whether a context menu was displayed. 4007 * 4008 * @hide 4009 */ 4010 public boolean showContextMenu(float x, float y, int metaState) { 4011 return showContextMenu(); 4012 } 4013 4014 /** 4015 * Start an action mode. 4016 * 4017 * @param callback Callback that will control the lifecycle of the action mode 4018 * @return The new action mode if it is started, null otherwise 4019 * 4020 * @see ActionMode 4021 */ 4022 public ActionMode startActionMode(ActionMode.Callback callback) { 4023 ViewParent parent = getParent(); 4024 if (parent == null) return null; 4025 return parent.startActionModeForChild(this, callback); 4026 } 4027 4028 /** 4029 * Register a callback to be invoked when a key is pressed in this view. 4030 * @param l the key listener to attach to this view 4031 */ 4032 public void setOnKeyListener(OnKeyListener l) { 4033 getListenerInfo().mOnKeyListener = l; 4034 } 4035 4036 /** 4037 * Register a callback to be invoked when a touch event is sent to this view. 4038 * @param l the touch listener to attach to this view 4039 */ 4040 public void setOnTouchListener(OnTouchListener l) { 4041 getListenerInfo().mOnTouchListener = l; 4042 } 4043 4044 /** 4045 * Register a callback to be invoked when a generic motion event is sent to this view. 4046 * @param l the generic motion listener to attach to this view 4047 */ 4048 public void setOnGenericMotionListener(OnGenericMotionListener l) { 4049 getListenerInfo().mOnGenericMotionListener = l; 4050 } 4051 4052 /** 4053 * Register a callback to be invoked when a hover event is sent to this view. 4054 * @param l the hover listener to attach to this view 4055 */ 4056 public void setOnHoverListener(OnHoverListener l) { 4057 getListenerInfo().mOnHoverListener = l; 4058 } 4059 4060 /** 4061 * Register a drag event listener callback object for this View. The parameter is 4062 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 4063 * View, the system calls the 4064 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 4065 * @param l An implementation of {@link android.view.View.OnDragListener}. 4066 */ 4067 public void setOnDragListener(OnDragListener l) { 4068 getListenerInfo().mOnDragListener = l; 4069 } 4070 4071 /** 4072 * Give this view focus. This will cause 4073 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} to be called. 4074 * 4075 * Note: this does not check whether this {@link View} should get focus, it just 4076 * gives it focus no matter what. It should only be called internally by framework 4077 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 4078 * 4079 * @param direction values are {@link View#FOCUS_UP}, {@link View#FOCUS_DOWN}, 4080 * {@link View#FOCUS_LEFT} or {@link View#FOCUS_RIGHT}. This is the direction which 4081 * focus moved when requestFocus() is called. It may not always 4082 * apply, in which case use the default View.FOCUS_DOWN. 4083 * @param previouslyFocusedRect The rectangle of the view that had focus 4084 * prior in this View's coordinate system. 4085 */ 4086 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 4087 if (DBG) { 4088 System.out.println(this + " requestFocus()"); 4089 } 4090 4091 if ((mPrivateFlags & FOCUSED) == 0) { 4092 mPrivateFlags |= FOCUSED; 4093 4094 if (mParent != null) { 4095 mParent.requestChildFocus(this, this); 4096 } 4097 4098 onFocusChanged(true, direction, previouslyFocusedRect); 4099 refreshDrawableState(); 4100 4101 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4102 notifyAccessibilityStateChanged(); 4103 } 4104 } 4105 } 4106 4107 /** 4108 * Request that a rectangle of this view be visible on the screen, 4109 * scrolling if necessary just enough. 4110 * 4111 * <p>A View should call this if it maintains some notion of which part 4112 * of its content is interesting. For example, a text editing view 4113 * should call this when its cursor moves. 4114 * 4115 * @param rectangle The rectangle. 4116 * @return Whether any parent scrolled. 4117 */ 4118 public boolean requestRectangleOnScreen(Rect rectangle) { 4119 return requestRectangleOnScreen(rectangle, false); 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 * <p>When <code>immediate</code> is set to true, scrolling will not be 4131 * animated. 4132 * 4133 * @param rectangle The rectangle. 4134 * @param immediate True to forbid animated scrolling, false otherwise 4135 * @return Whether any parent scrolled. 4136 */ 4137 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 4138 View child = this; 4139 ViewParent parent = mParent; 4140 boolean scrolled = false; 4141 while (parent != null) { 4142 scrolled |= parent.requestChildRectangleOnScreen(child, 4143 rectangle, immediate); 4144 4145 // offset rect so next call has the rectangle in the 4146 // coordinate system of its direct child. 4147 rectangle.offset(child.getLeft(), child.getTop()); 4148 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 4149 4150 if (!(parent instanceof View)) { 4151 break; 4152 } 4153 4154 child = (View) parent; 4155 parent = child.getParent(); 4156 } 4157 return scrolled; 4158 } 4159 4160 /** 4161 * Called when this view wants to give up focus. If focus is cleared 4162 * {@link #onFocusChanged(boolean, int, android.graphics.Rect)} is called. 4163 * <p> 4164 * <strong>Note:</strong> When a View clears focus the framework is trying 4165 * to give focus to the first focusable View from the top. Hence, if this 4166 * View is the first from the top that can take focus, then all callbacks 4167 * related to clearing focus will be invoked after wich the framework will 4168 * give focus to this view. 4169 * </p> 4170 */ 4171 public void clearFocus() { 4172 if (DBG) { 4173 System.out.println(this + " clearFocus()"); 4174 } 4175 4176 if ((mPrivateFlags & FOCUSED) != 0) { 4177 mPrivateFlags &= ~FOCUSED; 4178 4179 if (mParent != null) { 4180 mParent.clearChildFocus(this); 4181 } 4182 4183 onFocusChanged(false, 0, null); 4184 4185 refreshDrawableState(); 4186 4187 ensureInputFocusOnFirstFocusable(); 4188 4189 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4190 notifyAccessibilityStateChanged(); 4191 } 4192 } 4193 } 4194 4195 void ensureInputFocusOnFirstFocusable() { 4196 View root = getRootView(); 4197 if (root != null) { 4198 root.requestFocus(); 4199 } 4200 } 4201 4202 /** 4203 * Called internally by the view system when a new view is getting focus. 4204 * This is what clears the old focus. 4205 */ 4206 void unFocus() { 4207 if (DBG) { 4208 System.out.println(this + " unFocus()"); 4209 } 4210 4211 if ((mPrivateFlags & FOCUSED) != 0) { 4212 mPrivateFlags &= ~FOCUSED; 4213 4214 onFocusChanged(false, 0, null); 4215 refreshDrawableState(); 4216 4217 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4218 notifyAccessibilityStateChanged(); 4219 } 4220 } 4221 } 4222 4223 /** 4224 * Returns true if this view has focus iteself, or is the ancestor of the 4225 * view that has focus. 4226 * 4227 * @return True if this view has or contains focus, false otherwise. 4228 */ 4229 @ViewDebug.ExportedProperty(category = "focus") 4230 public boolean hasFocus() { 4231 return (mPrivateFlags & FOCUSED) != 0; 4232 } 4233 4234 /** 4235 * Returns true if this view is focusable or if it contains a reachable View 4236 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 4237 * is a View whose parents do not block descendants focus. 4238 * 4239 * Only {@link #VISIBLE} views are considered focusable. 4240 * 4241 * @return True if the view is focusable or if the view contains a focusable 4242 * View, false otherwise. 4243 * 4244 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 4245 */ 4246 public boolean hasFocusable() { 4247 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 4248 } 4249 4250 /** 4251 * Called by the view system when the focus state of this view changes. 4252 * When the focus change event is caused by directional navigation, direction 4253 * and previouslyFocusedRect provide insight into where the focus is coming from. 4254 * When overriding, be sure to call up through to the super class so that 4255 * the standard focus handling will occur. 4256 * 4257 * @param gainFocus True if the View has focus; false otherwise. 4258 * @param direction The direction focus has moved when requestFocus() 4259 * is called to give this view focus. Values are 4260 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 4261 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 4262 * It may not always apply, in which case use the default. 4263 * @param previouslyFocusedRect The rectangle, in this view's coordinate 4264 * system, of the previously focused view. If applicable, this will be 4265 * passed in as finer grained information about where the focus is coming 4266 * from (in addition to direction). Will be <code>null</code> otherwise. 4267 */ 4268 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 4269 if (gainFocus) { 4270 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4271 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 4272 requestAccessibilityFocus(); 4273 } 4274 } 4275 4276 InputMethodManager imm = InputMethodManager.peekInstance(); 4277 if (!gainFocus) { 4278 if (isPressed()) { 4279 setPressed(false); 4280 } 4281 if (imm != null && mAttachInfo != null 4282 && mAttachInfo.mHasWindowFocus) { 4283 imm.focusOut(this); 4284 } 4285 onFocusLost(); 4286 } else if (imm != null && mAttachInfo != null 4287 && mAttachInfo.mHasWindowFocus) { 4288 imm.focusIn(this); 4289 } 4290 4291 invalidate(true); 4292 ListenerInfo li = mListenerInfo; 4293 if (li != null && li.mOnFocusChangeListener != null) { 4294 li.mOnFocusChangeListener.onFocusChange(this, gainFocus); 4295 } 4296 4297 if (mAttachInfo != null) { 4298 mAttachInfo.mKeyDispatchState.reset(this); 4299 } 4300 } 4301 4302 /** 4303 * Sends an accessibility event of the given type. If accessiiblity is 4304 * not enabled this method has no effect. The default implementation calls 4305 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)} first 4306 * to populate information about the event source (this View), then calls 4307 * {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} to 4308 * populate the text content of the event source including its descendants, 4309 * and last calls 4310 * {@link ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent)} 4311 * on its parent to resuest sending of the event to interested parties. 4312 * <p> 4313 * If an {@link AccessibilityDelegate} has been specified via calling 4314 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4315 * {@link AccessibilityDelegate#sendAccessibilityEvent(View, int)} is 4316 * responsible for handling this call. 4317 * </p> 4318 * 4319 * @param eventType The type of the event to send, as defined by several types from 4320 * {@link android.view.accessibility.AccessibilityEvent}, such as 4321 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_CLICKED} or 4322 * {@link android.view.accessibility.AccessibilityEvent#TYPE_VIEW_HOVER_ENTER}. 4323 * 4324 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4325 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4326 * @see ViewParent#requestSendAccessibilityEvent(View, AccessibilityEvent) 4327 * @see AccessibilityDelegate 4328 */ 4329 public void sendAccessibilityEvent(int eventType) { 4330 if (mAccessibilityDelegate != null) { 4331 mAccessibilityDelegate.sendAccessibilityEvent(this, eventType); 4332 } else { 4333 sendAccessibilityEventInternal(eventType); 4334 } 4335 } 4336 4337 /** 4338 * Convenience method for sending a {@link AccessibilityEvent#TYPE_ANNOUNCEMENT} 4339 * {@link AccessibilityEvent} to make an announcement which is related to some 4340 * sort of a context change for which none of the events representing UI transitions 4341 * is a good fit. For example, announcing a new page in a book. If accessibility 4342 * is not enabled this method does nothing. 4343 * 4344 * @param text The announcement text. 4345 */ 4346 public void announceForAccessibility(CharSequence text) { 4347 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4348 AccessibilityEvent event = AccessibilityEvent.obtain( 4349 AccessibilityEvent.TYPE_ANNOUNCEMENT); 4350 event.getText().add(text); 4351 sendAccessibilityEventUnchecked(event); 4352 } 4353 } 4354 4355 /** 4356 * @see #sendAccessibilityEvent(int) 4357 * 4358 * Note: Called from the default {@link AccessibilityDelegate}. 4359 */ 4360 void sendAccessibilityEventInternal(int eventType) { 4361 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 4362 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 4363 } 4364 } 4365 4366 /** 4367 * This method behaves exactly as {@link #sendAccessibilityEvent(int)} but 4368 * takes as an argument an empty {@link AccessibilityEvent} and does not 4369 * perform a check whether accessibility is enabled. 4370 * <p> 4371 * If an {@link AccessibilityDelegate} has been specified via calling 4372 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4373 * {@link AccessibilityDelegate#sendAccessibilityEventUnchecked(View, AccessibilityEvent)} 4374 * is responsible for handling this call. 4375 * </p> 4376 * 4377 * @param event The event to send. 4378 * 4379 * @see #sendAccessibilityEvent(int) 4380 */ 4381 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 4382 if (mAccessibilityDelegate != null) { 4383 mAccessibilityDelegate.sendAccessibilityEventUnchecked(this, event); 4384 } else { 4385 sendAccessibilityEventUncheckedInternal(event); 4386 } 4387 } 4388 4389 /** 4390 * @see #sendAccessibilityEventUnchecked(AccessibilityEvent) 4391 * 4392 * Note: Called from the default {@link AccessibilityDelegate}. 4393 */ 4394 void sendAccessibilityEventUncheckedInternal(AccessibilityEvent event) { 4395 if (!isShown()) { 4396 return; 4397 } 4398 onInitializeAccessibilityEvent(event); 4399 // Only a subset of accessibility events populates text content. 4400 if ((event.getEventType() & POPULATING_ACCESSIBILITY_EVENT_TYPES) != 0) { 4401 dispatchPopulateAccessibilityEvent(event); 4402 } 4403 // Intercept accessibility focus events fired by virtual nodes to keep 4404 // track of accessibility focus position in such nodes. 4405 final int eventType = event.getEventType(); 4406 switch (eventType) { 4407 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED: { 4408 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4409 event.getSourceNodeId()); 4410 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4411 ViewRootImpl viewRootImpl = getViewRootImpl(); 4412 if (viewRootImpl != null) { 4413 viewRootImpl.setAccessibilityFocusedHost(this); 4414 } 4415 } 4416 } break; 4417 case AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED: { 4418 final long virtualNodeId = AccessibilityNodeInfo.getVirtualDescendantId( 4419 event.getSourceNodeId()); 4420 if (virtualNodeId != AccessibilityNodeInfo.UNDEFINED) { 4421 ViewRootImpl viewRootImpl = getViewRootImpl(); 4422 if (viewRootImpl != null) { 4423 viewRootImpl.setAccessibilityFocusedHost(null); 4424 } 4425 } 4426 } break; 4427 } 4428 // In the beginning we called #isShown(), so we know that getParent() is not null. 4429 getParent().requestSendAccessibilityEvent(this, event); 4430 } 4431 4432 /** 4433 * Dispatches an {@link AccessibilityEvent} to the {@link View} first and then 4434 * to its children for adding their text content to the event. Note that the 4435 * event text is populated in a separate dispatch path since we add to the 4436 * event not only the text of the source but also the text of all its descendants. 4437 * A typical implementation will call 4438 * {@link #onPopulateAccessibilityEvent(AccessibilityEvent)} on the this view 4439 * and then call the {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4440 * on each child. Override this method if custom population of the event text 4441 * content is required. 4442 * <p> 4443 * If an {@link AccessibilityDelegate} has been specified via calling 4444 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4445 * {@link AccessibilityDelegate#dispatchPopulateAccessibilityEvent(View, AccessibilityEvent)} 4446 * is responsible for handling this call. 4447 * </p> 4448 * <p> 4449 * <em>Note:</em> Accessibility events of certain types are not dispatched for 4450 * populating the event text via this method. For details refer to {@link AccessibilityEvent}. 4451 * </p> 4452 * 4453 * @param event The event. 4454 * 4455 * @return True if the event population was completed. 4456 */ 4457 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 4458 if (mAccessibilityDelegate != null) { 4459 return mAccessibilityDelegate.dispatchPopulateAccessibilityEvent(this, event); 4460 } else { 4461 return dispatchPopulateAccessibilityEventInternal(event); 4462 } 4463 } 4464 4465 /** 4466 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4467 * 4468 * Note: Called from the default {@link AccessibilityDelegate}. 4469 */ 4470 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4471 onPopulateAccessibilityEvent(event); 4472 return false; 4473 } 4474 4475 /** 4476 * Called from {@link #dispatchPopulateAccessibilityEvent(AccessibilityEvent)} 4477 * giving a chance to this View to populate the accessibility event with its 4478 * text content. While this method is free to modify event 4479 * attributes other than text content, doing so should normally be performed in 4480 * {@link #onInitializeAccessibilityEvent(AccessibilityEvent)}. 4481 * <p> 4482 * Example: Adding formatted date string to an accessibility event in addition 4483 * to the text added by the super implementation: 4484 * <pre> public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4485 * super.onPopulateAccessibilityEvent(event); 4486 * final int flags = DateUtils.FORMAT_SHOW_DATE | DateUtils.FORMAT_SHOW_WEEKDAY; 4487 * String selectedDateUtterance = DateUtils.formatDateTime(mContext, 4488 * mCurrentDate.getTimeInMillis(), flags); 4489 * event.getText().add(selectedDateUtterance); 4490 * }</pre> 4491 * <p> 4492 * If an {@link AccessibilityDelegate} has been specified via calling 4493 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4494 * {@link AccessibilityDelegate#onPopulateAccessibilityEvent(View, AccessibilityEvent)} 4495 * is responsible for handling this call. 4496 * </p> 4497 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4498 * information to the event, in case the default implementation has basic information to add. 4499 * </p> 4500 * 4501 * @param event The accessibility event which to populate. 4502 * 4503 * @see #sendAccessibilityEvent(int) 4504 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4505 */ 4506 public void onPopulateAccessibilityEvent(AccessibilityEvent event) { 4507 if (mAccessibilityDelegate != null) { 4508 mAccessibilityDelegate.onPopulateAccessibilityEvent(this, event); 4509 } else { 4510 onPopulateAccessibilityEventInternal(event); 4511 } 4512 } 4513 4514 /** 4515 * @see #onPopulateAccessibilityEvent(AccessibilityEvent) 4516 * 4517 * Note: Called from the default {@link AccessibilityDelegate}. 4518 */ 4519 void onPopulateAccessibilityEventInternal(AccessibilityEvent event) { 4520 4521 } 4522 4523 /** 4524 * Initializes an {@link AccessibilityEvent} with information about 4525 * this View which is the event source. In other words, the source of 4526 * an accessibility event is the view whose state change triggered firing 4527 * the event. 4528 * <p> 4529 * Example: Setting the password property of an event in addition 4530 * to properties set by the super implementation: 4531 * <pre> public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4532 * super.onInitializeAccessibilityEvent(event); 4533 * event.setPassword(true); 4534 * }</pre> 4535 * <p> 4536 * If an {@link AccessibilityDelegate} has been specified via calling 4537 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4538 * {@link AccessibilityDelegate#onInitializeAccessibilityEvent(View, AccessibilityEvent)} 4539 * is responsible for handling this call. 4540 * </p> 4541 * <p class="note"><strong>Note:</strong> Always call the super implementation before adding 4542 * information to the event, in case the default implementation has basic information to add. 4543 * </p> 4544 * @param event The event to initialize. 4545 * 4546 * @see #sendAccessibilityEvent(int) 4547 * @see #dispatchPopulateAccessibilityEvent(AccessibilityEvent) 4548 */ 4549 public void onInitializeAccessibilityEvent(AccessibilityEvent event) { 4550 if (mAccessibilityDelegate != null) { 4551 mAccessibilityDelegate.onInitializeAccessibilityEvent(this, event); 4552 } else { 4553 onInitializeAccessibilityEventInternal(event); 4554 } 4555 } 4556 4557 /** 4558 * @see #onInitializeAccessibilityEvent(AccessibilityEvent) 4559 * 4560 * Note: Called from the default {@link AccessibilityDelegate}. 4561 */ 4562 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 4563 event.setSource(this); 4564 event.setClassName(View.class.getName()); 4565 event.setPackageName(getContext().getPackageName()); 4566 event.setEnabled(isEnabled()); 4567 event.setContentDescription(mContentDescription); 4568 4569 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 4570 ArrayList<View> focusablesTempList = mAttachInfo.mTempArrayList; 4571 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, 4572 FOCUSABLES_ALL); 4573 event.setItemCount(focusablesTempList.size()); 4574 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 4575 focusablesTempList.clear(); 4576 } 4577 } 4578 4579 /** 4580 * Returns an {@link AccessibilityNodeInfo} representing this view from the 4581 * point of view of an {@link android.accessibilityservice.AccessibilityService}. 4582 * This method is responsible for obtaining an accessibility node info from a 4583 * pool of reusable instances and calling 4584 * {@link #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} on this view to 4585 * initialize the former. 4586 * <p> 4587 * Note: The client is responsible for recycling the obtained instance by calling 4588 * {@link AccessibilityNodeInfo#recycle()} to minimize object creation. 4589 * </p> 4590 * 4591 * @return A populated {@link AccessibilityNodeInfo}. 4592 * 4593 * @see AccessibilityNodeInfo 4594 */ 4595 public AccessibilityNodeInfo createAccessibilityNodeInfo() { 4596 AccessibilityNodeProvider provider = getAccessibilityNodeProvider(); 4597 if (provider != null) { 4598 return provider.createAccessibilityNodeInfo(View.NO_ID); 4599 } else { 4600 AccessibilityNodeInfo info = AccessibilityNodeInfo.obtain(this); 4601 onInitializeAccessibilityNodeInfo(info); 4602 return info; 4603 } 4604 } 4605 4606 /** 4607 * Initializes an {@link AccessibilityNodeInfo} with information about this view. 4608 * The base implementation sets: 4609 * <ul> 4610 * <li>{@link AccessibilityNodeInfo#setParent(View)},</li> 4611 * <li>{@link AccessibilityNodeInfo#setBoundsInParent(Rect)},</li> 4612 * <li>{@link AccessibilityNodeInfo#setBoundsInScreen(Rect)},</li> 4613 * <li>{@link AccessibilityNodeInfo#setPackageName(CharSequence)},</li> 4614 * <li>{@link AccessibilityNodeInfo#setClassName(CharSequence)},</li> 4615 * <li>{@link AccessibilityNodeInfo#setContentDescription(CharSequence)},</li> 4616 * <li>{@link AccessibilityNodeInfo#setEnabled(boolean)},</li> 4617 * <li>{@link AccessibilityNodeInfo#setClickable(boolean)},</li> 4618 * <li>{@link AccessibilityNodeInfo#setFocusable(boolean)},</li> 4619 * <li>{@link AccessibilityNodeInfo#setFocused(boolean)},</li> 4620 * <li>{@link AccessibilityNodeInfo#setLongClickable(boolean)},</li> 4621 * <li>{@link AccessibilityNodeInfo#setSelected(boolean)},</li> 4622 * </ul> 4623 * <p> 4624 * Subclasses should override this method, call the super implementation, 4625 * and set additional attributes. 4626 * </p> 4627 * <p> 4628 * If an {@link AccessibilityDelegate} has been specified via calling 4629 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4630 * {@link AccessibilityDelegate#onInitializeAccessibilityNodeInfo(View, AccessibilityNodeInfo)} 4631 * is responsible for handling this call. 4632 * </p> 4633 * 4634 * @param info The instance to initialize. 4635 */ 4636 public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) { 4637 if (mAccessibilityDelegate != null) { 4638 mAccessibilityDelegate.onInitializeAccessibilityNodeInfo(this, info); 4639 } else { 4640 onInitializeAccessibilityNodeInfoInternal(info); 4641 } 4642 } 4643 4644 /** 4645 * @see #onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 4646 * 4647 * Note: Called from the default {@link AccessibilityDelegate}. 4648 */ 4649 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 4650 Rect bounds = mAttachInfo.mTmpInvalRect; 4651 getDrawingRect(bounds); 4652 info.setBoundsInParent(bounds); 4653 4654 getGlobalVisibleRect(bounds); 4655 bounds.offset(mAttachInfo.mWindowLeft, mAttachInfo.mWindowTop); 4656 info.setBoundsInScreen(bounds); 4657 4658 if ((mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { 4659 ViewParent parent = getParentForAccessibility(); 4660 if (parent instanceof View) { 4661 info.setParent((View) parent); 4662 } 4663 } 4664 4665 info.setPackageName(mContext.getPackageName()); 4666 info.setClassName(View.class.getName()); 4667 info.setContentDescription(getContentDescription()); 4668 4669 info.setEnabled(isEnabled()); 4670 info.setClickable(isClickable()); 4671 info.setFocusable(isFocusable()); 4672 info.setFocused(isFocused()); 4673 info.setAccessibilityFocused(isAccessibilityFocused()); 4674 info.setSelected(isSelected()); 4675 info.setLongClickable(isLongClickable()); 4676 4677 // TODO: These make sense only if we are in an AdapterView but all 4678 // views can be selected. Maybe from accessiiblity perspective 4679 // we should report as selectable view in an AdapterView. 4680 info.addAction(AccessibilityNodeInfo.ACTION_SELECT); 4681 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_SELECTION); 4682 4683 if (isFocusable()) { 4684 if (isFocused()) { 4685 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_FOCUS); 4686 } else { 4687 info.addAction(AccessibilityNodeInfo.ACTION_FOCUS); 4688 } 4689 } 4690 4691 info.addAction(AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS); 4692 info.addAction(AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS); 4693 4694 if (isClickable()) { 4695 info.addAction(AccessibilityNodeInfo.ACTION_CLICK); 4696 } 4697 4698 if (isLongClickable()) { 4699 info.addAction(AccessibilityNodeInfo.ACTION_LONG_CLICK); 4700 } 4701 4702 if (getContentDescription() != null) { 4703 info.addAction(AccessibilityNodeInfo.ACTION_NEXT_AT_GRANULARITY); 4704 info.addAction(AccessibilityNodeInfo.ACTION_PREVIOUS_AT_GRANULARITY); 4705 info.setGranularities(AccessibilityNodeInfo.GRANULARITY_CHARACTER 4706 | AccessibilityNodeInfo.GRANULARITY_WORD); 4707 } 4708 } 4709 4710 /** 4711 * Computes whether this view is visible on the screen. 4712 * 4713 * @return Whether the view is visible on the screen. 4714 */ 4715 boolean isDisplayedOnScreen() { 4716 // The first two checks are made also made by isShown() which 4717 // however traverses the tree up to the parent to catch that. 4718 // Therefore, we do some fail fast check to minimize the up 4719 // tree traversal. 4720 return (mAttachInfo != null 4721 && mAttachInfo.mWindowVisibility == View.VISIBLE 4722 && getAlpha() > 0 4723 && isShown() 4724 && getGlobalVisibleRect(mAttachInfo.mTmpInvalRect)); 4725 } 4726 4727 /** 4728 * Sets a delegate for implementing accessibility support via compositon as 4729 * opposed to inheritance. The delegate's primary use is for implementing 4730 * backwards compatible widgets. For more details see {@link AccessibilityDelegate}. 4731 * 4732 * @param delegate The delegate instance. 4733 * 4734 * @see AccessibilityDelegate 4735 */ 4736 public void setAccessibilityDelegate(AccessibilityDelegate delegate) { 4737 mAccessibilityDelegate = delegate; 4738 } 4739 4740 /** 4741 * Gets the provider for managing a virtual view hierarchy rooted at this View 4742 * and reported to {@link android.accessibilityservice.AccessibilityService}s 4743 * that explore the window content. 4744 * <p> 4745 * If this method returns an instance, this instance is responsible for managing 4746 * {@link AccessibilityNodeInfo}s describing the virtual sub-tree rooted at this 4747 * View including the one representing the View itself. Similarly the returned 4748 * instance is responsible for performing accessibility actions on any virtual 4749 * view or the root view itself. 4750 * </p> 4751 * <p> 4752 * If an {@link AccessibilityDelegate} has been specified via calling 4753 * {@link #setAccessibilityDelegate(AccessibilityDelegate)} its 4754 * {@link AccessibilityDelegate#getAccessibilityNodeProvider(View)} 4755 * is responsible for handling this call. 4756 * </p> 4757 * 4758 * @return The provider. 4759 * 4760 * @see AccessibilityNodeProvider 4761 */ 4762 public AccessibilityNodeProvider getAccessibilityNodeProvider() { 4763 if (mAccessibilityDelegate != null) { 4764 return mAccessibilityDelegate.getAccessibilityNodeProvider(this); 4765 } else { 4766 return null; 4767 } 4768 } 4769 4770 /** 4771 * Gets the unique identifier of this view on the screen for accessibility purposes. 4772 * If this {@link View} is not attached to any window, {@value #NO_ID} is returned. 4773 * 4774 * @return The view accessibility id. 4775 * 4776 * @hide 4777 */ 4778 public int getAccessibilityViewId() { 4779 if (mAccessibilityViewId == NO_ID) { 4780 mAccessibilityViewId = sNextAccessibilityViewId++; 4781 } 4782 return mAccessibilityViewId; 4783 } 4784 4785 /** 4786 * Gets the unique identifier of the window in which this View reseides. 4787 * 4788 * @return The window accessibility id. 4789 * 4790 * @hide 4791 */ 4792 public int getAccessibilityWindowId() { 4793 return mAttachInfo != null ? mAttachInfo.mAccessibilityWindowId : NO_ID; 4794 } 4795 4796 /** 4797 * Gets the {@link View} description. It briefly describes the view and is 4798 * primarily used for accessibility support. Set this property to enable 4799 * better accessibility support for your application. This is especially 4800 * true for views that do not have textual representation (For example, 4801 * ImageButton). 4802 * 4803 * @return The content description. 4804 * 4805 * @attr ref android.R.styleable#View_contentDescription 4806 */ 4807 @ViewDebug.ExportedProperty(category = "accessibility") 4808 public CharSequence getContentDescription() { 4809 return mContentDescription; 4810 } 4811 4812 /** 4813 * Sets the {@link View} description. It briefly describes the view and is 4814 * primarily used for accessibility support. Set this property to enable 4815 * better accessibility support for your application. This is especially 4816 * true for views that do not have textual representation (For example, 4817 * ImageButton). 4818 * 4819 * @param contentDescription The content description. 4820 * 4821 * @attr ref android.R.styleable#View_contentDescription 4822 */ 4823 @RemotableViewMethod 4824 public void setContentDescription(CharSequence contentDescription) { 4825 mContentDescription = contentDescription; 4826 } 4827 4828 /** 4829 * Invoked whenever this view loses focus, either by losing window focus or by losing 4830 * focus within its window. This method can be used to clear any state tied to the 4831 * focus. For instance, if a button is held pressed with the trackball and the window 4832 * loses focus, this method can be used to cancel the press. 4833 * 4834 * Subclasses of View overriding this method should always call super.onFocusLost(). 4835 * 4836 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 4837 * @see #onWindowFocusChanged(boolean) 4838 * 4839 * @hide pending API council approval 4840 */ 4841 protected void onFocusLost() { 4842 resetPressedState(); 4843 } 4844 4845 private void resetPressedState() { 4846 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4847 return; 4848 } 4849 4850 if (isPressed()) { 4851 setPressed(false); 4852 4853 if (!mHasPerformedLongPress) { 4854 removeLongPressCallback(); 4855 } 4856 } 4857 } 4858 4859 /** 4860 * Returns true if this view has focus 4861 * 4862 * @return True if this view has focus, false otherwise. 4863 */ 4864 @ViewDebug.ExportedProperty(category = "focus") 4865 public boolean isFocused() { 4866 return (mPrivateFlags & FOCUSED) != 0; 4867 } 4868 4869 /** 4870 * Find the view in the hierarchy rooted at this view that currently has 4871 * focus. 4872 * 4873 * @return The view that currently has focus, or null if no focused view can 4874 * be found. 4875 */ 4876 public View findFocus() { 4877 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 4878 } 4879 4880 /** 4881 * Indicates whether this view is one of the set of scrollable containers in 4882 * its window. 4883 * 4884 * @return whether this view is one of the set of scrollable containers in 4885 * its window 4886 * 4887 * @attr ref android.R.styleable#View_isScrollContainer 4888 */ 4889 public boolean isScrollContainer() { 4890 return (mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0; 4891 } 4892 4893 /** 4894 * Change whether this view is one of the set of scrollable containers in 4895 * its window. This will be used to determine whether the window can 4896 * resize or must pan when a soft input area is open -- scrollable 4897 * containers allow the window to use resize mode since the container 4898 * will appropriately shrink. 4899 * 4900 * @attr ref android.R.styleable#View_isScrollContainer 4901 */ 4902 public void setScrollContainer(boolean isScrollContainer) { 4903 if (isScrollContainer) { 4904 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 4905 mAttachInfo.mScrollContainers.add(this); 4906 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 4907 } 4908 mPrivateFlags |= SCROLL_CONTAINER; 4909 } else { 4910 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 4911 mAttachInfo.mScrollContainers.remove(this); 4912 } 4913 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 4914 } 4915 } 4916 4917 /** 4918 * Returns the quality of the drawing cache. 4919 * 4920 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4921 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4922 * 4923 * @see #setDrawingCacheQuality(int) 4924 * @see #setDrawingCacheEnabled(boolean) 4925 * @see #isDrawingCacheEnabled() 4926 * 4927 * @attr ref android.R.styleable#View_drawingCacheQuality 4928 */ 4929 public int getDrawingCacheQuality() { 4930 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 4931 } 4932 4933 /** 4934 * Set the drawing cache quality of this view. This value is used only when the 4935 * drawing cache is enabled 4936 * 4937 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 4938 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 4939 * 4940 * @see #getDrawingCacheQuality() 4941 * @see #setDrawingCacheEnabled(boolean) 4942 * @see #isDrawingCacheEnabled() 4943 * 4944 * @attr ref android.R.styleable#View_drawingCacheQuality 4945 */ 4946 public void setDrawingCacheQuality(int quality) { 4947 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 4948 } 4949 4950 /** 4951 * Returns whether the screen should remain on, corresponding to the current 4952 * value of {@link #KEEP_SCREEN_ON}. 4953 * 4954 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 4955 * 4956 * @see #setKeepScreenOn(boolean) 4957 * 4958 * @attr ref android.R.styleable#View_keepScreenOn 4959 */ 4960 public boolean getKeepScreenOn() { 4961 return (mViewFlags & KEEP_SCREEN_ON) != 0; 4962 } 4963 4964 /** 4965 * Controls whether the screen should remain on, modifying the 4966 * value of {@link #KEEP_SCREEN_ON}. 4967 * 4968 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 4969 * 4970 * @see #getKeepScreenOn() 4971 * 4972 * @attr ref android.R.styleable#View_keepScreenOn 4973 */ 4974 public void setKeepScreenOn(boolean keepScreenOn) { 4975 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 4976 } 4977 4978 /** 4979 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4980 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 4981 * 4982 * @attr ref android.R.styleable#View_nextFocusLeft 4983 */ 4984 public int getNextFocusLeftId() { 4985 return mNextFocusLeftId; 4986 } 4987 4988 /** 4989 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 4990 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 4991 * decide automatically. 4992 * 4993 * @attr ref android.R.styleable#View_nextFocusLeft 4994 */ 4995 public void setNextFocusLeftId(int nextFocusLeftId) { 4996 mNextFocusLeftId = nextFocusLeftId; 4997 } 4998 4999 /** 5000 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5001 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5002 * 5003 * @attr ref android.R.styleable#View_nextFocusRight 5004 */ 5005 public int getNextFocusRightId() { 5006 return mNextFocusRightId; 5007 } 5008 5009 /** 5010 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 5011 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 5012 * decide automatically. 5013 * 5014 * @attr ref android.R.styleable#View_nextFocusRight 5015 */ 5016 public void setNextFocusRightId(int nextFocusRightId) { 5017 mNextFocusRightId = nextFocusRightId; 5018 } 5019 5020 /** 5021 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5022 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5023 * 5024 * @attr ref android.R.styleable#View_nextFocusUp 5025 */ 5026 public int getNextFocusUpId() { 5027 return mNextFocusUpId; 5028 } 5029 5030 /** 5031 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 5032 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 5033 * decide automatically. 5034 * 5035 * @attr ref android.R.styleable#View_nextFocusUp 5036 */ 5037 public void setNextFocusUpId(int nextFocusUpId) { 5038 mNextFocusUpId = nextFocusUpId; 5039 } 5040 5041 /** 5042 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5043 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5044 * 5045 * @attr ref android.R.styleable#View_nextFocusDown 5046 */ 5047 public int getNextFocusDownId() { 5048 return mNextFocusDownId; 5049 } 5050 5051 /** 5052 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 5053 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 5054 * decide automatically. 5055 * 5056 * @attr ref android.R.styleable#View_nextFocusDown 5057 */ 5058 public void setNextFocusDownId(int nextFocusDownId) { 5059 mNextFocusDownId = nextFocusDownId; 5060 } 5061 5062 /** 5063 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5064 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 5065 * 5066 * @attr ref android.R.styleable#View_nextFocusForward 5067 */ 5068 public int getNextFocusForwardId() { 5069 return mNextFocusForwardId; 5070 } 5071 5072 /** 5073 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 5074 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 5075 * decide automatically. 5076 * 5077 * @attr ref android.R.styleable#View_nextFocusForward 5078 */ 5079 public void setNextFocusForwardId(int nextFocusForwardId) { 5080 mNextFocusForwardId = nextFocusForwardId; 5081 } 5082 5083 /** 5084 * Returns the visibility of this view and all of its ancestors 5085 * 5086 * @return True if this view and all of its ancestors are {@link #VISIBLE} 5087 */ 5088 public boolean isShown() { 5089 View current = this; 5090 //noinspection ConstantConditions 5091 do { 5092 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5093 return false; 5094 } 5095 ViewParent parent = current.mParent; 5096 if (parent == null) { 5097 return false; // We are not attached to the view root 5098 } 5099 if (!(parent instanceof View)) { 5100 return true; 5101 } 5102 current = (View) parent; 5103 } while (current != null); 5104 5105 return false; 5106 } 5107 5108 /** 5109 * Called by the view hierarchy when the content insets for a window have 5110 * changed, to allow it to adjust its content to fit within those windows. 5111 * The content insets tell you the space that the status bar, input method, 5112 * and other system windows infringe on the application's window. 5113 * 5114 * <p>You do not normally need to deal with this function, since the default 5115 * window decoration given to applications takes care of applying it to the 5116 * content of the window. If you use {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN} 5117 * or {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION} this will not be the case, 5118 * and your content can be placed under those system elements. You can then 5119 * use this method within your view hierarchy if you have parts of your UI 5120 * which you would like to ensure are not being covered. 5121 * 5122 * <p>The default implementation of this method simply applies the content 5123 * inset's to the view's padding. This can be enabled through 5124 * {@link #setFitsSystemWindows(boolean)}. Alternatively, you can override 5125 * the method and handle the insets however you would like. Note that the 5126 * insets provided by the framework are always relative to the far edges 5127 * of the window, not accounting for the location of the called view within 5128 * that window. (In fact when this method is called you do not yet know 5129 * where the layout will place the view, as it is done before layout happens.) 5130 * 5131 * <p>Note: unlike many View methods, there is no dispatch phase to this 5132 * call. If you are overriding it in a ViewGroup and want to allow the 5133 * call to continue to your children, you must be sure to call the super 5134 * implementation. 5135 * 5136 * @param insets Current content insets of the window. Prior to 5137 * {@link android.os.Build.VERSION_CODES#JELLY_BEAN} you must not modify 5138 * the insets or else you and Android will be unhappy. 5139 * 5140 * @return Return true if this view applied the insets and it should not 5141 * continue propagating further down the hierarchy, false otherwise. 5142 */ 5143 protected boolean fitSystemWindows(Rect insets) { 5144 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 5145 mUserPaddingStart = -1; 5146 mUserPaddingEnd = -1; 5147 mUserPaddingRelative = false; 5148 if ((mViewFlags & OPTIONAL_FITS_SYSTEM_WINDOWS) == 0 5149 || mAttachInfo == null 5150 || (mAttachInfo.mSystemUiVisibility & SYSTEM_UI_LAYOUT_FLAGS) == 0) { 5151 internalSetPadding(insets.left, insets.top, insets.right, insets.bottom); 5152 return true; 5153 } else { 5154 internalSetPadding(0, 0, 0, 0); 5155 return false; 5156 } 5157 } 5158 return false; 5159 } 5160 5161 /** 5162 * Set whether or not this view should account for system screen decorations 5163 * such as the status bar and inset its content. This allows this view to be 5164 * positioned in absolute screen coordinates and remain visible to the user. 5165 * 5166 * <p>This should only be used by top-level window decor views. 5167 * 5168 * @param fitSystemWindows true to inset content for system screen decorations, false for 5169 * default behavior. 5170 * 5171 * @attr ref android.R.styleable#View_fitsSystemWindows 5172 */ 5173 public void setFitsSystemWindows(boolean fitSystemWindows) { 5174 setFlags(fitSystemWindows ? FITS_SYSTEM_WINDOWS : 0, FITS_SYSTEM_WINDOWS); 5175 } 5176 5177 /** 5178 * Check for the FITS_SYSTEM_WINDOWS flag. If this method returns true, this view 5179 * will account for system screen decorations such as the status bar and inset its 5180 * content. This allows the view to be positioned in absolute screen coordinates 5181 * and remain visible to the user. 5182 * 5183 * @return true if this view will adjust its content bounds for system screen decorations. 5184 * 5185 * @attr ref android.R.styleable#View_fitsSystemWindows 5186 */ 5187 public boolean fitsSystemWindows() { 5188 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 5189 } 5190 5191 /** 5192 * Ask that a new dispatch of {@link #fitSystemWindows(Rect)} be performed. 5193 */ 5194 public void requestFitSystemWindows() { 5195 if (mParent != null) { 5196 mParent.requestFitSystemWindows(); 5197 } 5198 } 5199 5200 /** 5201 * For use by PhoneWindow to make its own system window fitting optional. 5202 * @hide 5203 */ 5204 public void makeOptionalFitsSystemWindows() { 5205 setFlags(OPTIONAL_FITS_SYSTEM_WINDOWS, OPTIONAL_FITS_SYSTEM_WINDOWS); 5206 } 5207 5208 /** 5209 * Returns the visibility status for this view. 5210 * 5211 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5212 * @attr ref android.R.styleable#View_visibility 5213 */ 5214 @ViewDebug.ExportedProperty(mapping = { 5215 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 5216 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 5217 @ViewDebug.IntToString(from = GONE, to = "GONE") 5218 }) 5219 public int getVisibility() { 5220 return mViewFlags & VISIBILITY_MASK; 5221 } 5222 5223 /** 5224 * Set the enabled state of this view. 5225 * 5226 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 5227 * @attr ref android.R.styleable#View_visibility 5228 */ 5229 @RemotableViewMethod 5230 public void setVisibility(int visibility) { 5231 setFlags(visibility, VISIBILITY_MASK); 5232 if (mBackground != null) mBackground.setVisible(visibility == VISIBLE, false); 5233 } 5234 5235 /** 5236 * Returns the enabled status for this view. The interpretation of the 5237 * enabled state varies by subclass. 5238 * 5239 * @return True if this view is enabled, false otherwise. 5240 */ 5241 @ViewDebug.ExportedProperty 5242 public boolean isEnabled() { 5243 return (mViewFlags & ENABLED_MASK) == ENABLED; 5244 } 5245 5246 /** 5247 * Set the enabled state of this view. The interpretation of the enabled 5248 * state varies by subclass. 5249 * 5250 * @param enabled True if this view is enabled, false otherwise. 5251 */ 5252 @RemotableViewMethod 5253 public void setEnabled(boolean enabled) { 5254 if (enabled == isEnabled()) return; 5255 5256 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 5257 5258 /* 5259 * The View most likely has to change its appearance, so refresh 5260 * the drawable state. 5261 */ 5262 refreshDrawableState(); 5263 5264 // Invalidate too, since the default behavior for views is to be 5265 // be drawn at 50% alpha rather than to change the drawable. 5266 invalidate(true); 5267 } 5268 5269 /** 5270 * Set whether this view can receive the focus. 5271 * 5272 * Setting this to false will also ensure that this view is not focusable 5273 * in touch mode. 5274 * 5275 * @param focusable If true, this view can receive the focus. 5276 * 5277 * @see #setFocusableInTouchMode(boolean) 5278 * @attr ref android.R.styleable#View_focusable 5279 */ 5280 public void setFocusable(boolean focusable) { 5281 if (!focusable) { 5282 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 5283 } 5284 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 5285 } 5286 5287 /** 5288 * Set whether this view can receive focus while in touch mode. 5289 * 5290 * Setting this to true will also ensure that this view is focusable. 5291 * 5292 * @param focusableInTouchMode If true, this view can receive the focus while 5293 * in touch mode. 5294 * 5295 * @see #setFocusable(boolean) 5296 * @attr ref android.R.styleable#View_focusableInTouchMode 5297 */ 5298 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 5299 // Focusable in touch mode should always be set before the focusable flag 5300 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 5301 // which, in touch mode, will not successfully request focus on this view 5302 // because the focusable in touch mode flag is not set 5303 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 5304 if (focusableInTouchMode) { 5305 setFlags(FOCUSABLE, FOCUSABLE_MASK); 5306 } 5307 } 5308 5309 /** 5310 * Set whether this view should have sound effects enabled for events such as 5311 * clicking and touching. 5312 * 5313 * <p>You may wish to disable sound effects for a view if you already play sounds, 5314 * for instance, a dial key that plays dtmf tones. 5315 * 5316 * @param soundEffectsEnabled whether sound effects are enabled for this view. 5317 * @see #isSoundEffectsEnabled() 5318 * @see #playSoundEffect(int) 5319 * @attr ref android.R.styleable#View_soundEffectsEnabled 5320 */ 5321 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 5322 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 5323 } 5324 5325 /** 5326 * @return whether this view should have sound effects enabled for events such as 5327 * clicking and touching. 5328 * 5329 * @see #setSoundEffectsEnabled(boolean) 5330 * @see #playSoundEffect(int) 5331 * @attr ref android.R.styleable#View_soundEffectsEnabled 5332 */ 5333 @ViewDebug.ExportedProperty 5334 public boolean isSoundEffectsEnabled() { 5335 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 5336 } 5337 5338 /** 5339 * Set whether this view should have haptic feedback for events such as 5340 * long presses. 5341 * 5342 * <p>You may wish to disable haptic feedback if your view already controls 5343 * its own haptic feedback. 5344 * 5345 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 5346 * @see #isHapticFeedbackEnabled() 5347 * @see #performHapticFeedback(int) 5348 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5349 */ 5350 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 5351 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 5352 } 5353 5354 /** 5355 * @return whether this view should have haptic feedback enabled for events 5356 * long presses. 5357 * 5358 * @see #setHapticFeedbackEnabled(boolean) 5359 * @see #performHapticFeedback(int) 5360 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 5361 */ 5362 @ViewDebug.ExportedProperty 5363 public boolean isHapticFeedbackEnabled() { 5364 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 5365 } 5366 5367 /** 5368 * Returns the layout direction for this view. 5369 * 5370 * @return One of {@link #LAYOUT_DIRECTION_LTR}, 5371 * {@link #LAYOUT_DIRECTION_RTL}, 5372 * {@link #LAYOUT_DIRECTION_INHERIT} or 5373 * {@link #LAYOUT_DIRECTION_LOCALE}. 5374 * @attr ref android.R.styleable#View_layoutDirection 5375 */ 5376 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5377 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "LTR"), 5378 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RTL"), 5379 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_INHERIT, to = "INHERIT"), 5380 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LOCALE, to = "LOCALE") 5381 }) 5382 public int getLayoutDirection() { 5383 return (mPrivateFlags2 & LAYOUT_DIRECTION_MASK) >> LAYOUT_DIRECTION_MASK_SHIFT; 5384 } 5385 5386 /** 5387 * Set the layout direction for this view. This will propagate a reset of layout direction 5388 * resolution to the view's children and resolve layout direction for this view. 5389 * 5390 * @param layoutDirection One of {@link #LAYOUT_DIRECTION_LTR}, 5391 * {@link #LAYOUT_DIRECTION_RTL}, 5392 * {@link #LAYOUT_DIRECTION_INHERIT} or 5393 * {@link #LAYOUT_DIRECTION_LOCALE}. 5394 * 5395 * @attr ref android.R.styleable#View_layoutDirection 5396 */ 5397 @RemotableViewMethod 5398 public void setLayoutDirection(int layoutDirection) { 5399 if (getLayoutDirection() != layoutDirection) { 5400 // Reset the current layout direction and the resolved one 5401 mPrivateFlags2 &= ~LAYOUT_DIRECTION_MASK; 5402 resetResolvedLayoutDirection(); 5403 // Set the new layout direction (filtered) and ask for a layout pass 5404 mPrivateFlags2 |= 5405 ((layoutDirection << LAYOUT_DIRECTION_MASK_SHIFT) & LAYOUT_DIRECTION_MASK); 5406 requestLayout(); 5407 } 5408 } 5409 5410 /** 5411 * Returns the resolved layout direction for this view. 5412 * 5413 * @return {@link #LAYOUT_DIRECTION_RTL} if the layout direction is RTL or returns 5414 * {@link #LAYOUT_DIRECTION_LTR} if the layout direction is not RTL. 5415 */ 5416 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5417 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_LTR, to = "RESOLVED_DIRECTION_LTR"), 5418 @ViewDebug.IntToString(from = LAYOUT_DIRECTION_RTL, to = "RESOLVED_DIRECTION_RTL") 5419 }) 5420 public int getResolvedLayoutDirection() { 5421 // The layout diretion will be resolved only if needed 5422 if ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED) != LAYOUT_DIRECTION_RESOLVED) { 5423 resolveLayoutDirection(); 5424 } 5425 return ((mPrivateFlags2 & LAYOUT_DIRECTION_RESOLVED_RTL) == LAYOUT_DIRECTION_RESOLVED_RTL) ? 5426 LAYOUT_DIRECTION_RTL : LAYOUT_DIRECTION_LTR; 5427 } 5428 5429 /** 5430 * Indicates whether or not this view's layout is right-to-left. This is resolved from 5431 * layout attribute and/or the inherited value from the parent 5432 * 5433 * @return true if the layout is right-to-left. 5434 */ 5435 @ViewDebug.ExportedProperty(category = "layout") 5436 public boolean isLayoutRtl() { 5437 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL); 5438 } 5439 5440 /** 5441 * Indicates whether the view is currently tracking transient state that the 5442 * app should not need to concern itself with saving and restoring, but that 5443 * the framework should take special note to preserve when possible. 5444 * 5445 * <p>A view with transient state cannot be trivially rebound from an external 5446 * data source, such as an adapter binding item views in a list. This may be 5447 * because the view is performing an animation, tracking user selection 5448 * of content, or similar.</p> 5449 * 5450 * @return true if the view has transient state 5451 */ 5452 @ViewDebug.ExportedProperty(category = "layout") 5453 public boolean hasTransientState() { 5454 return (mPrivateFlags2 & HAS_TRANSIENT_STATE) == HAS_TRANSIENT_STATE; 5455 } 5456 5457 /** 5458 * Set whether this view is currently tracking transient state that the 5459 * framework should attempt to preserve when possible. This flag is reference counted, 5460 * so every call to setHasTransientState(true) should be paired with a later call 5461 * to setHasTransientState(false). 5462 * 5463 * <p>A view with transient state cannot be trivially rebound from an external 5464 * data source, such as an adapter binding item views in a list. This may be 5465 * because the view is performing an animation, tracking user selection 5466 * of content, or similar.</p> 5467 * 5468 * @param hasTransientState true if this view has transient state 5469 */ 5470 public void setHasTransientState(boolean hasTransientState) { 5471 mTransientStateCount = hasTransientState ? mTransientStateCount + 1 : 5472 mTransientStateCount - 1; 5473 if (mTransientStateCount < 0) { 5474 mTransientStateCount = 0; 5475 Log.e(VIEW_LOG_TAG, "hasTransientState decremented below 0: " + 5476 "unmatched pair of setHasTransientState calls"); 5477 } 5478 if ((hasTransientState && mTransientStateCount == 1) || 5479 (hasTransientState && mTransientStateCount == 0)) { 5480 // update flag if we've just incremented up from 0 or decremented down to 0 5481 mPrivateFlags2 = (mPrivateFlags2 & ~HAS_TRANSIENT_STATE) | 5482 (hasTransientState ? HAS_TRANSIENT_STATE : 0); 5483 if (mParent != null) { 5484 try { 5485 mParent.childHasTransientStateChanged(this, hasTransientState); 5486 } catch (AbstractMethodError e) { 5487 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 5488 " does not fully implement ViewParent", e); 5489 } 5490 } 5491 } 5492 } 5493 5494 /** 5495 * If this view doesn't do any drawing on its own, set this flag to 5496 * allow further optimizations. By default, this flag is not set on 5497 * View, but could be set on some View subclasses such as ViewGroup. 5498 * 5499 * Typically, if you override {@link #onDraw(android.graphics.Canvas)} 5500 * you should clear this flag. 5501 * 5502 * @param willNotDraw whether or not this View draw on its own 5503 */ 5504 public void setWillNotDraw(boolean willNotDraw) { 5505 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 5506 } 5507 5508 /** 5509 * Returns whether or not this View draws on its own. 5510 * 5511 * @return true if this view has nothing to draw, false otherwise 5512 */ 5513 @ViewDebug.ExportedProperty(category = "drawing") 5514 public boolean willNotDraw() { 5515 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 5516 } 5517 5518 /** 5519 * When a View's drawing cache is enabled, drawing is redirected to an 5520 * offscreen bitmap. Some views, like an ImageView, must be able to 5521 * bypass this mechanism if they already draw a single bitmap, to avoid 5522 * unnecessary usage of the memory. 5523 * 5524 * @param willNotCacheDrawing true if this view does not cache its 5525 * drawing, false otherwise 5526 */ 5527 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 5528 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 5529 } 5530 5531 /** 5532 * Returns whether or not this View can cache its drawing or not. 5533 * 5534 * @return true if this view does not cache its drawing, false otherwise 5535 */ 5536 @ViewDebug.ExportedProperty(category = "drawing") 5537 public boolean willNotCacheDrawing() { 5538 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 5539 } 5540 5541 /** 5542 * Indicates whether this view reacts to click events or not. 5543 * 5544 * @return true if the view is clickable, false otherwise 5545 * 5546 * @see #setClickable(boolean) 5547 * @attr ref android.R.styleable#View_clickable 5548 */ 5549 @ViewDebug.ExportedProperty 5550 public boolean isClickable() { 5551 return (mViewFlags & CLICKABLE) == CLICKABLE; 5552 } 5553 5554 /** 5555 * Enables or disables click events for this view. When a view 5556 * is clickable it will change its state to "pressed" on every click. 5557 * Subclasses should set the view clickable to visually react to 5558 * user's clicks. 5559 * 5560 * @param clickable true to make the view clickable, false otherwise 5561 * 5562 * @see #isClickable() 5563 * @attr ref android.R.styleable#View_clickable 5564 */ 5565 public void setClickable(boolean clickable) { 5566 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 5567 } 5568 5569 /** 5570 * Indicates whether this view reacts to long click events or not. 5571 * 5572 * @return true if the view is long clickable, false otherwise 5573 * 5574 * @see #setLongClickable(boolean) 5575 * @attr ref android.R.styleable#View_longClickable 5576 */ 5577 public boolean isLongClickable() { 5578 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 5579 } 5580 5581 /** 5582 * Enables or disables long click events for this view. When a view is long 5583 * clickable it reacts to the user holding down the button for a longer 5584 * duration than a tap. This event can either launch the listener or a 5585 * context menu. 5586 * 5587 * @param longClickable true to make the view long clickable, false otherwise 5588 * @see #isLongClickable() 5589 * @attr ref android.R.styleable#View_longClickable 5590 */ 5591 public void setLongClickable(boolean longClickable) { 5592 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 5593 } 5594 5595 /** 5596 * Sets the pressed state for this view. 5597 * 5598 * @see #isClickable() 5599 * @see #setClickable(boolean) 5600 * 5601 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 5602 * the View's internal state from a previously set "pressed" state. 5603 */ 5604 public void setPressed(boolean pressed) { 5605 final boolean needsRefresh = pressed != ((mPrivateFlags & PRESSED) == PRESSED); 5606 5607 if (pressed) { 5608 mPrivateFlags |= PRESSED; 5609 } else { 5610 mPrivateFlags &= ~PRESSED; 5611 } 5612 5613 if (needsRefresh) { 5614 refreshDrawableState(); 5615 } 5616 dispatchSetPressed(pressed); 5617 } 5618 5619 /** 5620 * Dispatch setPressed to all of this View's children. 5621 * 5622 * @see #setPressed(boolean) 5623 * 5624 * @param pressed The new pressed state 5625 */ 5626 protected void dispatchSetPressed(boolean pressed) { 5627 } 5628 5629 /** 5630 * Indicates whether the view is currently in pressed state. Unless 5631 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 5632 * the pressed state. 5633 * 5634 * @see #setPressed(boolean) 5635 * @see #isClickable() 5636 * @see #setClickable(boolean) 5637 * 5638 * @return true if the view is currently pressed, false otherwise 5639 */ 5640 public boolean isPressed() { 5641 return (mPrivateFlags & PRESSED) == PRESSED; 5642 } 5643 5644 /** 5645 * Indicates whether this view will save its state (that is, 5646 * whether its {@link #onSaveInstanceState} method will be called). 5647 * 5648 * @return Returns true if the view state saving is enabled, else false. 5649 * 5650 * @see #setSaveEnabled(boolean) 5651 * @attr ref android.R.styleable#View_saveEnabled 5652 */ 5653 public boolean isSaveEnabled() { 5654 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 5655 } 5656 5657 /** 5658 * Controls whether the saving of this view's state is 5659 * enabled (that is, whether its {@link #onSaveInstanceState} method 5660 * will be called). Note that even if freezing is enabled, the 5661 * view still must have an id assigned to it (via {@link #setId(int)}) 5662 * for its state to be saved. This flag can only disable the 5663 * saving of this view; any child views may still have their state saved. 5664 * 5665 * @param enabled Set to false to <em>disable</em> state saving, or true 5666 * (the default) to allow it. 5667 * 5668 * @see #isSaveEnabled() 5669 * @see #setId(int) 5670 * @see #onSaveInstanceState() 5671 * @attr ref android.R.styleable#View_saveEnabled 5672 */ 5673 public void setSaveEnabled(boolean enabled) { 5674 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 5675 } 5676 5677 /** 5678 * Gets whether the framework should discard touches when the view's 5679 * window is obscured by another visible window. 5680 * Refer to the {@link View} security documentation for more details. 5681 * 5682 * @return True if touch filtering is enabled. 5683 * 5684 * @see #setFilterTouchesWhenObscured(boolean) 5685 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5686 */ 5687 @ViewDebug.ExportedProperty 5688 public boolean getFilterTouchesWhenObscured() { 5689 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 5690 } 5691 5692 /** 5693 * Sets whether the framework should discard touches when the view's 5694 * window is obscured by another visible window. 5695 * Refer to the {@link View} security documentation for more details. 5696 * 5697 * @param enabled True if touch filtering should be enabled. 5698 * 5699 * @see #getFilterTouchesWhenObscured 5700 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 5701 */ 5702 public void setFilterTouchesWhenObscured(boolean enabled) { 5703 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 5704 FILTER_TOUCHES_WHEN_OBSCURED); 5705 } 5706 5707 /** 5708 * Indicates whether the entire hierarchy under this view will save its 5709 * state when a state saving traversal occurs from its parent. The default 5710 * is true; if false, these views will not be saved unless 5711 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5712 * 5713 * @return Returns true if the view state saving from parent is enabled, else false. 5714 * 5715 * @see #setSaveFromParentEnabled(boolean) 5716 */ 5717 public boolean isSaveFromParentEnabled() { 5718 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 5719 } 5720 5721 /** 5722 * Controls whether the entire hierarchy under this view will save its 5723 * state when a state saving traversal occurs from its parent. The default 5724 * is true; if false, these views will not be saved unless 5725 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 5726 * 5727 * @param enabled Set to false to <em>disable</em> state saving, or true 5728 * (the default) to allow it. 5729 * 5730 * @see #isSaveFromParentEnabled() 5731 * @see #setId(int) 5732 * @see #onSaveInstanceState() 5733 */ 5734 public void setSaveFromParentEnabled(boolean enabled) { 5735 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 5736 } 5737 5738 5739 /** 5740 * Returns whether this View is able to take focus. 5741 * 5742 * @return True if this view can take focus, or false otherwise. 5743 * @attr ref android.R.styleable#View_focusable 5744 */ 5745 @ViewDebug.ExportedProperty(category = "focus") 5746 public final boolean isFocusable() { 5747 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 5748 } 5749 5750 /** 5751 * When a view is focusable, it may not want to take focus when in touch mode. 5752 * For example, a button would like focus when the user is navigating via a D-pad 5753 * so that the user can click on it, but once the user starts touching the screen, 5754 * the button shouldn't take focus 5755 * @return Whether the view is focusable in touch mode. 5756 * @attr ref android.R.styleable#View_focusableInTouchMode 5757 */ 5758 @ViewDebug.ExportedProperty 5759 public final boolean isFocusableInTouchMode() { 5760 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 5761 } 5762 5763 /** 5764 * Find the nearest view in the specified direction that can take focus. 5765 * This does not actually give focus to that view. 5766 * 5767 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 5768 * 5769 * @return The nearest focusable in the specified direction, or null if none 5770 * can be found. 5771 */ 5772 public View focusSearch(int direction) { 5773 if (mParent != null) { 5774 return mParent.focusSearch(this, direction); 5775 } else { 5776 return null; 5777 } 5778 } 5779 5780 /** 5781 * This method is the last chance for the focused view and its ancestors to 5782 * respond to an arrow key. This is called when the focused view did not 5783 * consume the key internally, nor could the view system find a new view in 5784 * the requested direction to give focus to. 5785 * 5786 * @param focused The currently focused view. 5787 * @param direction The direction focus wants to move. One of FOCUS_UP, 5788 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 5789 * @return True if the this view consumed this unhandled move. 5790 */ 5791 public boolean dispatchUnhandledMove(View focused, int direction) { 5792 return false; 5793 } 5794 5795 /** 5796 * If a user manually specified the next view id for a particular direction, 5797 * use the root to look up the view. 5798 * @param root The root view of the hierarchy containing this view. 5799 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 5800 * or FOCUS_BACKWARD. 5801 * @return The user specified next view, or null if there is none. 5802 */ 5803 View findUserSetNextFocus(View root, int direction) { 5804 switch (direction) { 5805 case FOCUS_LEFT: 5806 if (mNextFocusLeftId == View.NO_ID) return null; 5807 return findViewInsideOutShouldExist(root, mNextFocusLeftId); 5808 case FOCUS_RIGHT: 5809 if (mNextFocusRightId == View.NO_ID) return null; 5810 return findViewInsideOutShouldExist(root, mNextFocusRightId); 5811 case FOCUS_UP: 5812 if (mNextFocusUpId == View.NO_ID) return null; 5813 return findViewInsideOutShouldExist(root, mNextFocusUpId); 5814 case FOCUS_DOWN: 5815 if (mNextFocusDownId == View.NO_ID) return null; 5816 return findViewInsideOutShouldExist(root, mNextFocusDownId); 5817 case FOCUS_FORWARD: 5818 if (mNextFocusForwardId == View.NO_ID) return null; 5819 return findViewInsideOutShouldExist(root, mNextFocusForwardId); 5820 case FOCUS_BACKWARD: { 5821 if (mID == View.NO_ID) return null; 5822 final int id = mID; 5823 return root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5824 @Override 5825 public boolean apply(View t) { 5826 return t.mNextFocusForwardId == id; 5827 } 5828 }); 5829 } 5830 } 5831 return null; 5832 } 5833 5834 private View findViewInsideOutShouldExist(View root, final int childViewId) { 5835 View result = root.findViewByPredicateInsideOut(this, new Predicate<View>() { 5836 @Override 5837 public boolean apply(View t) { 5838 return t.mID == childViewId; 5839 } 5840 }); 5841 5842 if (result == null) { 5843 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 5844 + "by user for id " + childViewId); 5845 } 5846 return result; 5847 } 5848 5849 /** 5850 * Find and return all focusable views that are descendants of this view, 5851 * possibly including this view if it is focusable itself. 5852 * 5853 * @param direction The direction of the focus 5854 * @return A list of focusable views 5855 */ 5856 public ArrayList<View> getFocusables(int direction) { 5857 ArrayList<View> result = new ArrayList<View>(24); 5858 addFocusables(result, direction); 5859 return result; 5860 } 5861 5862 /** 5863 * Add any focusable views that are descendants of this view (possibly 5864 * including this view if it is focusable itself) to views. If we are in touch mode, 5865 * only add views that are also focusable in touch mode. 5866 * 5867 * @param views Focusable views found so far 5868 * @param direction The direction of the focus 5869 */ 5870 public void addFocusables(ArrayList<View> views, int direction) { 5871 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 5872 } 5873 5874 /** 5875 * Adds any focusable views that are descendants of this view (possibly 5876 * including this view if it is focusable itself) to views. This method 5877 * adds all focusable views regardless if we are in touch mode or 5878 * only views focusable in touch mode if we are in touch mode or 5879 * only views that can take accessibility focus if accessibility is enabeld 5880 * depending on the focusable mode paramater. 5881 * 5882 * @param views Focusable views found so far or null if all we are interested is 5883 * the number of focusables. 5884 * @param direction The direction of the focus. 5885 * @param focusableMode The type of focusables to be added. 5886 * 5887 * @see #FOCUSABLES_ALL 5888 * @see #FOCUSABLES_TOUCH_MODE 5889 */ 5890 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 5891 if (views == null) { 5892 return; 5893 } 5894 if ((focusableMode & FOCUSABLES_ACCESSIBILITY) == FOCUSABLES_ACCESSIBILITY) { 5895 if (AccessibilityManager.getInstance(mContext).isEnabled() 5896 && includeForAccessibility()) { 5897 views.add(this); 5898 return; 5899 } 5900 } 5901 if (!isFocusable()) { 5902 return; 5903 } 5904 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE 5905 && isInTouchMode() && !isFocusableInTouchMode()) { 5906 return; 5907 } 5908 views.add(this); 5909 } 5910 5911 /** 5912 * Finds the Views that contain given text. The containment is case insensitive. 5913 * The search is performed by either the text that the View renders or the content 5914 * description that describes the view for accessibility purposes and the view does 5915 * not render or both. Clients can specify how the search is to be performed via 5916 * passing the {@link #FIND_VIEWS_WITH_TEXT} and 5917 * {@link #FIND_VIEWS_WITH_CONTENT_DESCRIPTION} flags. 5918 * 5919 * @param outViews The output list of matching Views. 5920 * @param searched The text to match against. 5921 * 5922 * @see #FIND_VIEWS_WITH_TEXT 5923 * @see #FIND_VIEWS_WITH_CONTENT_DESCRIPTION 5924 * @see #setContentDescription(CharSequence) 5925 */ 5926 public void findViewsWithText(ArrayList<View> outViews, CharSequence searched, int flags) { 5927 if (getAccessibilityNodeProvider() != null) { 5928 if ((flags & FIND_VIEWS_WITH_ACCESSIBILITY_NODE_PROVIDERS) != 0) { 5929 outViews.add(this); 5930 } 5931 } else if ((flags & FIND_VIEWS_WITH_CONTENT_DESCRIPTION) != 0 5932 && !TextUtils.isEmpty(searched) && !TextUtils.isEmpty(mContentDescription)) { 5933 String searchedLowerCase = searched.toString().toLowerCase(); 5934 String contentDescriptionLowerCase = mContentDescription.toString().toLowerCase(); 5935 if (contentDescriptionLowerCase.contains(searchedLowerCase)) { 5936 outViews.add(this); 5937 } 5938 } 5939 } 5940 5941 /** 5942 * Find and return all touchable views that are descendants of this view, 5943 * possibly including this view if it is touchable itself. 5944 * 5945 * @return A list of touchable views 5946 */ 5947 public ArrayList<View> getTouchables() { 5948 ArrayList<View> result = new ArrayList<View>(); 5949 addTouchables(result); 5950 return result; 5951 } 5952 5953 /** 5954 * Add any touchable views that are descendants of this view (possibly 5955 * including this view if it is touchable itself) to views. 5956 * 5957 * @param views Touchable views found so far 5958 */ 5959 public void addTouchables(ArrayList<View> views) { 5960 final int viewFlags = mViewFlags; 5961 5962 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 5963 && (viewFlags & ENABLED_MASK) == ENABLED) { 5964 views.add(this); 5965 } 5966 } 5967 5968 /** 5969 * Returns whether this View is accessibility focused. 5970 * 5971 * @return True if this View is accessibility focused. 5972 */ 5973 boolean isAccessibilityFocused() { 5974 return (mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0; 5975 } 5976 5977 /** 5978 * Call this to try to give accessibility focus to this view. 5979 * 5980 * A view will not actually take focus if {@link AccessibilityManager#isEnabled()} 5981 * returns false or the view is no visible or the view already has accessibility 5982 * focus. 5983 * 5984 * See also {@link #focusSearch(int)}, which is what you call to say that you 5985 * have focus, and you want your parent to look for the next one. 5986 * 5987 * @return Whether this view actually took accessibility focus. 5988 * 5989 * @hide 5990 */ 5991 public boolean requestAccessibilityFocus() { 5992 AccessibilityManager manager = AccessibilityManager.getInstance(mContext); 5993 if (!manager.isEnabled() || !manager.isTouchExplorationEnabled()) { 5994 return false; 5995 } 5996 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 5997 return false; 5998 } 5999 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) == 0) { 6000 mPrivateFlags2 |= ACCESSIBILITY_FOCUSED; 6001 ViewRootImpl viewRootImpl = getViewRootImpl(); 6002 if (viewRootImpl != null) { 6003 viewRootImpl.setAccessibilityFocusedHost(this); 6004 } 6005 invalidate(); 6006 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUSED); 6007 notifyAccessibilityStateChanged(); 6008 // Try to give input focus to this view - not a descendant. 6009 requestFocusNoSearch(View.FOCUS_DOWN, null); 6010 return true; 6011 } 6012 return false; 6013 } 6014 6015 /** 6016 * Call this to try to clear accessibility focus of this view. 6017 * 6018 * See also {@link #focusSearch(int)}, which is what you call to say that you 6019 * have focus, and you want your parent to look for the next one. 6020 * 6021 * @hide 6022 */ 6023 public void clearAccessibilityFocus() { 6024 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6025 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6026 ViewRootImpl viewRootImpl = getViewRootImpl(); 6027 if (viewRootImpl != null) { 6028 viewRootImpl.setAccessibilityFocusedHost(null); 6029 } 6030 invalidate(); 6031 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_ACCESSIBILITY_FOCUS_CLEARED); 6032 notifyAccessibilityStateChanged(); 6033 // Try to move accessibility focus to the input focus. 6034 View rootView = getRootView(); 6035 if (rootView != null) { 6036 View inputFocus = rootView.findFocus(); 6037 if (inputFocus != null) { 6038 inputFocus.requestAccessibilityFocus(); 6039 } 6040 } 6041 } 6042 } 6043 6044 /** 6045 * Find the best view to take accessibility focus from a hover. 6046 * This function finds the deepest actionable view and if that 6047 * fails ask the parent to take accessibility focus from hover. 6048 * 6049 * @param x The X hovered location in this view coorditantes. 6050 * @param y The Y hovered location in this view coorditantes. 6051 * @return Whether the request was handled. 6052 * 6053 * @hide 6054 */ 6055 public boolean requestAccessibilityFocusFromHover(float x, float y) { 6056 if (onRequestAccessibilityFocusFromHover(x, y)) { 6057 return true; 6058 } 6059 ViewParent parent = mParent; 6060 if (parent instanceof View) { 6061 View parentView = (View) parent; 6062 6063 float[] position = mAttachInfo.mTmpTransformLocation; 6064 position[0] = x; 6065 position[1] = y; 6066 6067 // Compensate for the transformation of the current matrix. 6068 if (!hasIdentityMatrix()) { 6069 getMatrix().mapPoints(position); 6070 } 6071 6072 // Compensate for the parent scroll and the offset 6073 // of this view stop from the parent top. 6074 position[0] += mLeft - parentView.mScrollX; 6075 position[1] += mTop - parentView.mScrollY; 6076 6077 return parentView.requestAccessibilityFocusFromHover(position[0], position[1]); 6078 } 6079 return false; 6080 } 6081 6082 /** 6083 * Requests to give this View focus from hover. 6084 * 6085 * @param x The X hovered location in this view coorditantes. 6086 * @param y The Y hovered location in this view coorditantes. 6087 * @return Whether the request was handled. 6088 * 6089 * @hide 6090 */ 6091 public boolean onRequestAccessibilityFocusFromHover(float x, float y) { 6092 if (includeForAccessibility() 6093 && (isActionableForAccessibility() || hasListenersForAccessibility())) { 6094 return requestAccessibilityFocus(); 6095 } 6096 return false; 6097 } 6098 6099 /** 6100 * Clears accessibility focus without calling any callback methods 6101 * normally invoked in {@link #clearAccessibilityFocus()}. This method 6102 * is used for clearing accessibility focus when giving this focus to 6103 * another view. 6104 */ 6105 void clearAccessibilityFocusNoCallbacks() { 6106 if ((mPrivateFlags2 & ACCESSIBILITY_FOCUSED) != 0) { 6107 mPrivateFlags2 &= ~ACCESSIBILITY_FOCUSED; 6108 invalidate(); 6109 } 6110 } 6111 6112 /** 6113 * Call this to try to give focus to a specific view or to one of its 6114 * descendants. 6115 * 6116 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6117 * false), or if it is focusable and it is not focusable in touch mode 6118 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6119 * 6120 * See also {@link #focusSearch(int)}, which is what you call to say that you 6121 * have focus, and you want your parent to look for the next one. 6122 * 6123 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 6124 * {@link #FOCUS_DOWN} and <code>null</code>. 6125 * 6126 * @return Whether this view or one of its descendants actually took focus. 6127 */ 6128 public final boolean requestFocus() { 6129 return requestFocus(View.FOCUS_DOWN); 6130 } 6131 6132 /** 6133 * Call this to try to give focus to a specific view or to one of its 6134 * descendants and give it a hint about what direction focus is heading. 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 6144 * <code>null</code> set for the previously focused rectangle. 6145 * 6146 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6147 * @return Whether this view or one of its descendants actually took focus. 6148 */ 6149 public final boolean requestFocus(int direction) { 6150 return requestFocus(direction, null); 6151 } 6152 6153 /** 6154 * Call this to try to give focus to a specific view or to one of its descendants 6155 * and give it hints about the direction and a specific rectangle that the focus 6156 * is coming from. The rectangle can help give larger views a finer grained hint 6157 * about where focus is coming from, and therefore, where to show selection, or 6158 * forward focus change internally. 6159 * 6160 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns 6161 * false), or if it is focusable and it is not focusable in touch mode 6162 * ({@link #isFocusableInTouchMode}) while the device is in touch mode. 6163 * 6164 * A View will not take focus if it is not visible. 6165 * 6166 * A View will not take focus if one of its parents has 6167 * {@link android.view.ViewGroup#getDescendantFocusability()} equal to 6168 * {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 6169 * 6170 * See also {@link #focusSearch(int)}, which is what you call to say that you 6171 * have focus, and you want your parent to look for the next one. 6172 * 6173 * You may wish to override this method if your custom {@link View} has an internal 6174 * {@link View} that it wishes to forward the request to. 6175 * 6176 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 6177 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 6178 * to give a finer grained hint about where focus is coming from. May be null 6179 * if there is no hint. 6180 * @return Whether this view or one of its descendants actually took focus. 6181 */ 6182 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 6183 return requestFocusNoSearch(direction, previouslyFocusedRect); 6184 } 6185 6186 private boolean requestFocusNoSearch(int direction, Rect previouslyFocusedRect) { 6187 // need to be focusable 6188 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 6189 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 6190 return false; 6191 } 6192 6193 // need to be focusable in touch mode if in touch mode 6194 if (isInTouchMode() && 6195 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 6196 return false; 6197 } 6198 6199 // need to not have any parents blocking us 6200 if (hasAncestorThatBlocksDescendantFocus()) { 6201 return false; 6202 } 6203 6204 handleFocusGainInternal(direction, previouslyFocusedRect); 6205 return true; 6206 } 6207 6208 /** 6209 * Call this to try to give focus to a specific view or to one of its descendants. This is a 6210 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 6211 * touch mode to request focus when they are touched. 6212 * 6213 * @return Whether this view or one of its descendants actually took focus. 6214 * 6215 * @see #isInTouchMode() 6216 * 6217 */ 6218 public final boolean requestFocusFromTouch() { 6219 // Leave touch mode if we need to 6220 if (isInTouchMode()) { 6221 ViewRootImpl viewRoot = getViewRootImpl(); 6222 if (viewRoot != null) { 6223 viewRoot.ensureTouchMode(false); 6224 } 6225 } 6226 return requestFocus(View.FOCUS_DOWN); 6227 } 6228 6229 /** 6230 * @return Whether any ancestor of this view blocks descendant focus. 6231 */ 6232 private boolean hasAncestorThatBlocksDescendantFocus() { 6233 ViewParent ancestor = mParent; 6234 while (ancestor instanceof ViewGroup) { 6235 final ViewGroup vgAncestor = (ViewGroup) ancestor; 6236 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 6237 return true; 6238 } else { 6239 ancestor = vgAncestor.getParent(); 6240 } 6241 } 6242 return false; 6243 } 6244 6245 /** 6246 * Gets the mode for determining whether this View is important for accessibility 6247 * which is if it fires accessibility events and if it is reported to 6248 * accessibility services that query the screen. 6249 * 6250 * @return The mode for determining whether a View is important for accessibility. 6251 * 6252 * @attr ref android.R.styleable#View_importantForAccessibility 6253 * 6254 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6255 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6256 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6257 */ 6258 @ViewDebug.ExportedProperty(category = "accessibility", mapping = { 6259 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_AUTO, 6260 to = "IMPORTANT_FOR_ACCESSIBILITY_AUTO"), 6261 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_YES, 6262 to = "IMPORTANT_FOR_ACCESSIBILITY_YES"), 6263 @ViewDebug.IntToString(from = IMPORTANT_FOR_ACCESSIBILITY_NO, 6264 to = "IMPORTANT_FOR_ACCESSIBILITY_NO") 6265 }) 6266 public int getImportantForAccessibility() { 6267 return (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6268 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6269 } 6270 6271 /** 6272 * Sets how to determine whether this view is important for accessibility 6273 * which is if it fires accessibility events and if it is reported to 6274 * accessibility services that query the screen. 6275 * 6276 * @param mode How to determine whether this view is important for accessibility. 6277 * 6278 * @attr ref android.R.styleable#View_importantForAccessibility 6279 * 6280 * @see #IMPORTANT_FOR_ACCESSIBILITY_YES 6281 * @see #IMPORTANT_FOR_ACCESSIBILITY_NO 6282 * @see #IMPORTANT_FOR_ACCESSIBILITY_AUTO 6283 */ 6284 public void setImportantForAccessibility(int mode) { 6285 if (mode != getImportantForAccessibility()) { 6286 mPrivateFlags2 &= ~IMPORTANT_FOR_ACCESSIBILITY_MASK; 6287 mPrivateFlags2 |= (mode << IMPORTANT_FOR_ACCESSIBILITY_SHIFT) 6288 & IMPORTANT_FOR_ACCESSIBILITY_MASK; 6289 notifyAccessibilityStateChanged(); 6290 } 6291 } 6292 6293 /** 6294 * Gets whether this view should be exposed for accessibility. 6295 * 6296 * @return Whether the view is exposed for accessibility. 6297 * 6298 * @hide 6299 */ 6300 public boolean isImportantForAccessibility() { 6301 final int mode = (mPrivateFlags2 & IMPORTANT_FOR_ACCESSIBILITY_MASK) 6302 >> IMPORTANT_FOR_ACCESSIBILITY_SHIFT; 6303 switch (mode) { 6304 case IMPORTANT_FOR_ACCESSIBILITY_YES: 6305 return true; 6306 case IMPORTANT_FOR_ACCESSIBILITY_NO: 6307 return false; 6308 case IMPORTANT_FOR_ACCESSIBILITY_AUTO: 6309 return isActionableForAccessibility() || hasListenersForAccessibility(); 6310 default: 6311 throw new IllegalArgumentException("Unknow important for accessibility mode: " 6312 + mode); 6313 } 6314 } 6315 6316 /** 6317 * Gets the parent for accessibility purposes. Note that the parent for 6318 * accessibility is not necessary the immediate parent. It is the first 6319 * predecessor that is important for accessibility. 6320 * 6321 * @return The parent for accessibility purposes. 6322 */ 6323 public ViewParent getParentForAccessibility() { 6324 if (mParent instanceof View) { 6325 View parentView = (View) mParent; 6326 if (parentView.includeForAccessibility()) { 6327 return mParent; 6328 } else { 6329 return mParent.getParentForAccessibility(); 6330 } 6331 } 6332 return null; 6333 } 6334 6335 /** 6336 * Adds the children of a given View for accessibility. Since some Views are 6337 * not important for accessibility the children for accessibility are not 6338 * necessarily direct children of the riew, rather they are the first level of 6339 * descendants important for accessibility. 6340 * 6341 * @param children The list of children for accessibility. 6342 */ 6343 public void addChildrenForAccessibility(ArrayList<View> children) { 6344 if (includeForAccessibility()) { 6345 children.add(this); 6346 } 6347 } 6348 6349 /** 6350 * Whether to regard this view for accessibility. A view is regarded for 6351 * accessibility if it is important for accessibility or the querying 6352 * accessibility service has explicitly requested that view not 6353 * important for accessibility are regarded. 6354 * 6355 * @return Whether to regard the view for accessibility. 6356 */ 6357 boolean includeForAccessibility() { 6358 if (mAttachInfo != null) { 6359 if (!mAttachInfo.mIncludeNotImportantViews) { 6360 return isImportantForAccessibility() && isDisplayedOnScreen(); 6361 } else { 6362 return isDisplayedOnScreen(); 6363 } 6364 } 6365 return false; 6366 } 6367 6368 /** 6369 * Returns whether the View is considered actionable from 6370 * accessibility perspective. Such view are important for 6371 * accessiiblity. 6372 * 6373 * @return True if the view is actionable for accessibility. 6374 */ 6375 private boolean isActionableForAccessibility() { 6376 return (isClickable() || isLongClickable() || isFocusable()); 6377 } 6378 6379 /** 6380 * Returns whether the View has registered callbacks wich makes it 6381 * important for accessiiblity. 6382 * 6383 * @return True if the view is actionable for accessibility. 6384 */ 6385 private boolean hasListenersForAccessibility() { 6386 ListenerInfo info = getListenerInfo(); 6387 return mTouchDelegate != null || info.mOnKeyListener != null 6388 || info.mOnTouchListener != null || info.mOnGenericMotionListener != null 6389 || info.mOnHoverListener != null || info.mOnDragListener != null; 6390 } 6391 6392 /** 6393 * Notifies accessibility services that some view's important for 6394 * accessibility state has changed. Note that such notifications 6395 * are made at most once every 6396 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()} 6397 * to avoid unnecessary load to the system. Also once a view has 6398 * made a notifucation this method is a NOP until the notification has 6399 * been sent to clients. 6400 * 6401 * @hide 6402 * 6403 * TODO: Makse sure this method is called for any view state change 6404 * that is interesting for accessilility purposes. 6405 */ 6406 public void notifyAccessibilityStateChanged() { 6407 if ((mPrivateFlags2 & ACCESSIBILITY_STATE_CHANGED) == 0) { 6408 mPrivateFlags2 |= ACCESSIBILITY_STATE_CHANGED; 6409 if (mParent != null) { 6410 mParent.childAccessibilityStateChanged(this); 6411 } 6412 } 6413 } 6414 6415 /** 6416 * Reset the state indicating the this view has requested clients 6417 * interested in its accessiblity state to be notified. 6418 * 6419 * @hide 6420 */ 6421 public void resetAccessibilityStateChanged() { 6422 mPrivateFlags2 &= ~ACCESSIBILITY_STATE_CHANGED; 6423 } 6424 6425 /** 6426 * Performs the specified accessibility action on the view. For 6427 * possible accessibility actions look at {@link AccessibilityNodeInfo}. 6428 * 6429 * @param action The action to perform. 6430 * @return Whether the action was performed. 6431 */ 6432 public boolean performAccessibilityAction(int action, Bundle args) { 6433 switch (action) { 6434 case AccessibilityNodeInfo.ACTION_CLICK: { 6435 if (isClickable()) { 6436 performClick(); 6437 } 6438 } break; 6439 case AccessibilityNodeInfo.ACTION_LONG_CLICK: { 6440 if (isLongClickable()) { 6441 performLongClick(); 6442 } 6443 } break; 6444 case AccessibilityNodeInfo.ACTION_FOCUS: { 6445 if (!hasFocus()) { 6446 // Get out of touch mode since accessibility 6447 // wants to move focus around. 6448 getViewRootImpl().ensureTouchMode(false); 6449 return requestFocus(); 6450 } 6451 } break; 6452 case AccessibilityNodeInfo.ACTION_CLEAR_FOCUS: { 6453 if (hasFocus()) { 6454 clearFocus(); 6455 return !isFocused(); 6456 } 6457 } break; 6458 case AccessibilityNodeInfo.ACTION_SELECT: { 6459 if (!isSelected()) { 6460 setSelected(true); 6461 return isSelected(); 6462 } 6463 } break; 6464 case AccessibilityNodeInfo.ACTION_CLEAR_SELECTION: { 6465 if (isSelected()) { 6466 setSelected(false); 6467 return !isSelected(); 6468 } 6469 } break; 6470 case AccessibilityNodeInfo.ACTION_ACCESSIBILITY_FOCUS: { 6471 if (!isAccessibilityFocused()) { 6472 return requestAccessibilityFocus(); 6473 } 6474 } break; 6475 case AccessibilityNodeInfo.ACTION_CLEAR_ACCESSIBILITY_FOCUS: { 6476 if (isAccessibilityFocused()) { 6477 clearAccessibilityFocus(); 6478 return true; 6479 } 6480 } break; 6481 } 6482 return false; 6483 } 6484 6485 /** 6486 * @hide 6487 */ 6488 public void dispatchStartTemporaryDetach() { 6489 onStartTemporaryDetach(); 6490 } 6491 6492 /** 6493 * This is called when a container is going to temporarily detach a child, with 6494 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 6495 * It will either be followed by {@link #onFinishTemporaryDetach()} or 6496 * {@link #onDetachedFromWindow()} when the container is done. 6497 */ 6498 public void onStartTemporaryDetach() { 6499 removeUnsetPressCallback(); 6500 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 6501 } 6502 6503 /** 6504 * @hide 6505 */ 6506 public void dispatchFinishTemporaryDetach() { 6507 onFinishTemporaryDetach(); 6508 } 6509 6510 /** 6511 * Called after {@link #onStartTemporaryDetach} when the container is done 6512 * changing the view. 6513 */ 6514 public void onFinishTemporaryDetach() { 6515 } 6516 6517 /** 6518 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 6519 * for this view's window. Returns null if the view is not currently attached 6520 * to the window. Normally you will not need to use this directly, but 6521 * just use the standard high-level event callbacks like 6522 * {@link #onKeyDown(int, KeyEvent)}. 6523 */ 6524 public KeyEvent.DispatcherState getKeyDispatcherState() { 6525 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 6526 } 6527 6528 /** 6529 * Dispatch a key event before it is processed by any input method 6530 * associated with the view hierarchy. This can be used to intercept 6531 * key events in special situations before the IME consumes them; a 6532 * typical example would be handling the BACK key to update the application's 6533 * UI instead of allowing the IME to see it and close itself. 6534 * 6535 * @param event The key event to be dispatched. 6536 * @return True if the event was handled, false otherwise. 6537 */ 6538 public boolean dispatchKeyEventPreIme(KeyEvent event) { 6539 return onKeyPreIme(event.getKeyCode(), event); 6540 } 6541 6542 /** 6543 * Dispatch a key event to the next view on the focus path. This path runs 6544 * from the top of the view tree down to the currently focused view. If this 6545 * view has focus, it will dispatch to itself. Otherwise it will dispatch 6546 * the next node down the focus path. This method also fires any key 6547 * listeners. 6548 * 6549 * @param event The key event to be dispatched. 6550 * @return True if the event was handled, false otherwise. 6551 */ 6552 public boolean dispatchKeyEvent(KeyEvent event) { 6553 if (mInputEventConsistencyVerifier != null) { 6554 mInputEventConsistencyVerifier.onKeyEvent(event, 0); 6555 } 6556 6557 // Give any attached key listener a first crack at the event. 6558 //noinspection SimplifiableIfStatement 6559 ListenerInfo li = mListenerInfo; 6560 if (li != null && li.mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6561 && li.mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 6562 return true; 6563 } 6564 6565 if (event.dispatch(this, mAttachInfo != null 6566 ? mAttachInfo.mKeyDispatchState : null, this)) { 6567 return true; 6568 } 6569 6570 if (mInputEventConsistencyVerifier != null) { 6571 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6572 } 6573 return false; 6574 } 6575 6576 /** 6577 * Dispatches a key shortcut event. 6578 * 6579 * @param event The key event to be dispatched. 6580 * @return True if the event was handled by the view, false otherwise. 6581 */ 6582 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 6583 return onKeyShortcut(event.getKeyCode(), event); 6584 } 6585 6586 /** 6587 * Pass the touch screen motion event down to the target view, or this 6588 * view if it is the target. 6589 * 6590 * @param event The motion event to be dispatched. 6591 * @return True if the event was handled by the view, false otherwise. 6592 */ 6593 public boolean dispatchTouchEvent(MotionEvent event) { 6594 if (mInputEventConsistencyVerifier != null) { 6595 mInputEventConsistencyVerifier.onTouchEvent(event, 0); 6596 } 6597 6598 if (onFilterTouchEventForSecurity(event)) { 6599 //noinspection SimplifiableIfStatement 6600 ListenerInfo li = mListenerInfo; 6601 if (li != null && li.mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 6602 && li.mOnTouchListener.onTouch(this, event)) { 6603 return true; 6604 } 6605 6606 if (onTouchEvent(event)) { 6607 return true; 6608 } 6609 } 6610 6611 if (mInputEventConsistencyVerifier != null) { 6612 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6613 } 6614 return false; 6615 } 6616 6617 /** 6618 * Filter the touch event to apply security policies. 6619 * 6620 * @param event The motion event to be filtered. 6621 * @return True if the event should be dispatched, false if the event should be dropped. 6622 * 6623 * @see #getFilterTouchesWhenObscured 6624 */ 6625 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 6626 //noinspection RedundantIfStatement 6627 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 6628 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 6629 // Window is obscured, drop this touch. 6630 return false; 6631 } 6632 return true; 6633 } 6634 6635 /** 6636 * Pass a trackball motion event down to the focused view. 6637 * 6638 * @param event The motion event to be dispatched. 6639 * @return True if the event was handled by the view, false otherwise. 6640 */ 6641 public boolean dispatchTrackballEvent(MotionEvent event) { 6642 if (mInputEventConsistencyVerifier != null) { 6643 mInputEventConsistencyVerifier.onTrackballEvent(event, 0); 6644 } 6645 6646 return onTrackballEvent(event); 6647 } 6648 6649 /** 6650 * Dispatch a generic motion event. 6651 * <p> 6652 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 6653 * are delivered to the view under the pointer. All other generic motion events are 6654 * delivered to the focused view. Hover events are handled specially and are delivered 6655 * to {@link #onHoverEvent(MotionEvent)}. 6656 * </p> 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 dispatchGenericMotionEvent(MotionEvent event) { 6662 if (mInputEventConsistencyVerifier != null) { 6663 mInputEventConsistencyVerifier.onGenericMotionEvent(event, 0); 6664 } 6665 6666 final int source = event.getSource(); 6667 if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) { 6668 final int action = event.getAction(); 6669 if (action == MotionEvent.ACTION_HOVER_ENTER 6670 || action == MotionEvent.ACTION_HOVER_MOVE 6671 || action == MotionEvent.ACTION_HOVER_EXIT) { 6672 if (dispatchHoverEvent(event)) { 6673 return true; 6674 } 6675 } else if (dispatchGenericPointerEvent(event)) { 6676 return true; 6677 } 6678 } else if (dispatchGenericFocusedEvent(event)) { 6679 return true; 6680 } 6681 6682 if (dispatchGenericMotionEventInternal(event)) { 6683 return true; 6684 } 6685 6686 if (mInputEventConsistencyVerifier != null) { 6687 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6688 } 6689 return false; 6690 } 6691 6692 private boolean dispatchGenericMotionEventInternal(MotionEvent event) { 6693 //noinspection SimplifiableIfStatement 6694 ListenerInfo li = mListenerInfo; 6695 if (li != null && li.mOnGenericMotionListener != null 6696 && (mViewFlags & ENABLED_MASK) == ENABLED 6697 && li.mOnGenericMotionListener.onGenericMotion(this, event)) { 6698 return true; 6699 } 6700 6701 if (onGenericMotionEvent(event)) { 6702 return true; 6703 } 6704 6705 if (mInputEventConsistencyVerifier != null) { 6706 mInputEventConsistencyVerifier.onUnhandledEvent(event, 0); 6707 } 6708 return false; 6709 } 6710 6711 /** 6712 * Dispatch a hover event. 6713 * <p> 6714 * Do not call this method directly. 6715 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6716 * </p> 6717 * 6718 * @param event The motion event to be dispatched. 6719 * @return True if the event was handled by the view, false otherwise. 6720 */ 6721 protected boolean dispatchHoverEvent(MotionEvent event) { 6722 //noinspection SimplifiableIfStatement 6723 ListenerInfo li = mListenerInfo; 6724 if (li != null && li.mOnHoverListener != null 6725 && (mViewFlags & ENABLED_MASK) == ENABLED 6726 && li.mOnHoverListener.onHover(this, event)) { 6727 return true; 6728 } 6729 6730 return onHoverEvent(event); 6731 } 6732 6733 /** 6734 * Returns true if the view has a child to which it has recently sent 6735 * {@link MotionEvent#ACTION_HOVER_ENTER}. If this view is hovered and 6736 * it does not have a hovered child, then it must be the innermost hovered view. 6737 * @hide 6738 */ 6739 protected boolean hasHoveredChild() { 6740 return false; 6741 } 6742 6743 /** 6744 * Dispatch a generic motion event to the view under the first pointer. 6745 * <p> 6746 * Do not call this method directly. 6747 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6748 * </p> 6749 * 6750 * @param event The motion event to be dispatched. 6751 * @return True if the event was handled by the view, false otherwise. 6752 */ 6753 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 6754 return false; 6755 } 6756 6757 /** 6758 * Dispatch a generic motion event to the currently focused view. 6759 * <p> 6760 * Do not call this method directly. 6761 * Call {@link #dispatchGenericMotionEvent(MotionEvent)} instead. 6762 * </p> 6763 * 6764 * @param event The motion event to be dispatched. 6765 * @return True if the event was handled by the view, false otherwise. 6766 */ 6767 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 6768 return false; 6769 } 6770 6771 /** 6772 * Dispatch a pointer event. 6773 * <p> 6774 * Dispatches touch related pointer events to {@link #onTouchEvent(MotionEvent)} and all 6775 * other events to {@link #onGenericMotionEvent(MotionEvent)}. This separation of concerns 6776 * reinforces the invariant that {@link #onTouchEvent(MotionEvent)} is really about touches 6777 * and should not be expected to handle other pointing device features. 6778 * </p> 6779 * 6780 * @param event The motion event to be dispatched. 6781 * @return True if the event was handled by the view, false otherwise. 6782 * @hide 6783 */ 6784 public final boolean dispatchPointerEvent(MotionEvent event) { 6785 if (event.isTouchEvent()) { 6786 return dispatchTouchEvent(event); 6787 } else { 6788 return dispatchGenericMotionEvent(event); 6789 } 6790 } 6791 6792 /** 6793 * Called when the window containing this view gains or loses window focus. 6794 * ViewGroups should override to route to their children. 6795 * 6796 * @param hasFocus True if the window containing this view now has focus, 6797 * false otherwise. 6798 */ 6799 public void dispatchWindowFocusChanged(boolean hasFocus) { 6800 onWindowFocusChanged(hasFocus); 6801 } 6802 6803 /** 6804 * Called when the window containing this view gains or loses focus. Note 6805 * that this is separate from view focus: to receive key events, both 6806 * your view and its window must have focus. If a window is displayed 6807 * on top of yours that takes input focus, then your own window will lose 6808 * focus but the view focus will remain unchanged. 6809 * 6810 * @param hasWindowFocus True if the window containing this view now has 6811 * focus, false otherwise. 6812 */ 6813 public void onWindowFocusChanged(boolean hasWindowFocus) { 6814 InputMethodManager imm = InputMethodManager.peekInstance(); 6815 if (!hasWindowFocus) { 6816 if (isPressed()) { 6817 setPressed(false); 6818 } 6819 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 6820 imm.focusOut(this); 6821 } 6822 removeLongPressCallback(); 6823 removeTapCallback(); 6824 onFocusLost(); 6825 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 6826 imm.focusIn(this); 6827 } 6828 refreshDrawableState(); 6829 } 6830 6831 /** 6832 * Returns true if this view is in a window that currently has window focus. 6833 * Note that this is not the same as the view itself having focus. 6834 * 6835 * @return True if this view is in a window that currently has window focus. 6836 */ 6837 public boolean hasWindowFocus() { 6838 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 6839 } 6840 6841 /** 6842 * Dispatch a view visibility change down the view hierarchy. 6843 * ViewGroups should override to route to their children. 6844 * @param changedView The view whose visibility changed. Could be 'this' or 6845 * an ancestor view. 6846 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 6847 * {@link #INVISIBLE} or {@link #GONE}. 6848 */ 6849 protected void dispatchVisibilityChanged(View changedView, int visibility) { 6850 onVisibilityChanged(changedView, visibility); 6851 } 6852 6853 /** 6854 * Called when the visibility of the view or an ancestor of the view is changed. 6855 * @param changedView The view whose visibility changed. Could be 'this' or 6856 * an ancestor view. 6857 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 6858 * {@link #INVISIBLE} or {@link #GONE}. 6859 */ 6860 protected void onVisibilityChanged(View changedView, int visibility) { 6861 if (visibility == VISIBLE) { 6862 if (mAttachInfo != null) { 6863 initialAwakenScrollBars(); 6864 } else { 6865 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 6866 } 6867 } 6868 } 6869 6870 /** 6871 * Dispatch a hint about whether this view is displayed. For instance, when 6872 * a View moves out of the screen, it might receives a display hint indicating 6873 * the view is not displayed. Applications should not <em>rely</em> on this hint 6874 * as there is no guarantee that they will receive one. 6875 * 6876 * @param hint A hint about whether or not this view is displayed: 6877 * {@link #VISIBLE} or {@link #INVISIBLE}. 6878 */ 6879 public void dispatchDisplayHint(int hint) { 6880 onDisplayHint(hint); 6881 } 6882 6883 /** 6884 * Gives this view a hint about whether is displayed or not. For instance, when 6885 * a View moves out of the screen, it might receives a display hint indicating 6886 * the view is not displayed. Applications should not <em>rely</em> on this hint 6887 * as there is no guarantee that they will receive one. 6888 * 6889 * @param hint A hint about whether or not this view is displayed: 6890 * {@link #VISIBLE} or {@link #INVISIBLE}. 6891 */ 6892 protected void onDisplayHint(int hint) { 6893 } 6894 6895 /** 6896 * Dispatch a window visibility change down the view hierarchy. 6897 * ViewGroups should override to route to their children. 6898 * 6899 * @param visibility The new visibility of the window. 6900 * 6901 * @see #onWindowVisibilityChanged(int) 6902 */ 6903 public void dispatchWindowVisibilityChanged(int visibility) { 6904 onWindowVisibilityChanged(visibility); 6905 } 6906 6907 /** 6908 * Called when the window containing has change its visibility 6909 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 6910 * that this tells you whether or not your window is being made visible 6911 * to the window manager; this does <em>not</em> tell you whether or not 6912 * your window is obscured by other windows on the screen, even if it 6913 * is itself visible. 6914 * 6915 * @param visibility The new visibility of the window. 6916 */ 6917 protected void onWindowVisibilityChanged(int visibility) { 6918 if (visibility == VISIBLE) { 6919 initialAwakenScrollBars(); 6920 } 6921 } 6922 6923 /** 6924 * Returns the current visibility of the window this view is attached to 6925 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 6926 * 6927 * @return Returns the current visibility of the view's window. 6928 */ 6929 public int getWindowVisibility() { 6930 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 6931 } 6932 6933 /** 6934 * Retrieve the overall visible display size in which the window this view is 6935 * attached to has been positioned in. This takes into account screen 6936 * decorations above the window, for both cases where the window itself 6937 * is being position inside of them or the window is being placed under 6938 * then and covered insets are used for the window to position its content 6939 * inside. In effect, this tells you the available area where content can 6940 * be placed and remain visible to users. 6941 * 6942 * <p>This function requires an IPC back to the window manager to retrieve 6943 * the requested information, so should not be used in performance critical 6944 * code like drawing. 6945 * 6946 * @param outRect Filled in with the visible display frame. If the view 6947 * is not attached to a window, this is simply the raw display size. 6948 */ 6949 public void getWindowVisibleDisplayFrame(Rect outRect) { 6950 if (mAttachInfo != null) { 6951 try { 6952 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 6953 } catch (RemoteException e) { 6954 return; 6955 } 6956 // XXX This is really broken, and probably all needs to be done 6957 // in the window manager, and we need to know more about whether 6958 // we want the area behind or in front of the IME. 6959 final Rect insets = mAttachInfo.mVisibleInsets; 6960 outRect.left += insets.left; 6961 outRect.top += insets.top; 6962 outRect.right -= insets.right; 6963 outRect.bottom -= insets.bottom; 6964 return; 6965 } 6966 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 6967 d.getRectSize(outRect); 6968 } 6969 6970 /** 6971 * Dispatch a notification about a resource configuration change down 6972 * the view hierarchy. 6973 * ViewGroups should override to route to their children. 6974 * 6975 * @param newConfig The new resource configuration. 6976 * 6977 * @see #onConfigurationChanged(android.content.res.Configuration) 6978 */ 6979 public void dispatchConfigurationChanged(Configuration newConfig) { 6980 onConfigurationChanged(newConfig); 6981 } 6982 6983 /** 6984 * Called when the current configuration of the resources being used 6985 * by the application have changed. You can use this to decide when 6986 * to reload resources that can changed based on orientation and other 6987 * configuration characterstics. You only need to use this if you are 6988 * not relying on the normal {@link android.app.Activity} mechanism of 6989 * recreating the activity instance upon a configuration change. 6990 * 6991 * @param newConfig The new resource configuration. 6992 */ 6993 protected void onConfigurationChanged(Configuration newConfig) { 6994 } 6995 6996 /** 6997 * Private function to aggregate all per-view attributes in to the view 6998 * root. 6999 */ 7000 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7001 performCollectViewAttributes(attachInfo, visibility); 7002 } 7003 7004 void performCollectViewAttributes(AttachInfo attachInfo, int visibility) { 7005 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 7006 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 7007 attachInfo.mKeepScreenOn = true; 7008 } 7009 attachInfo.mSystemUiVisibility |= mSystemUiVisibility; 7010 ListenerInfo li = mListenerInfo; 7011 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 7012 attachInfo.mHasSystemUiListeners = true; 7013 } 7014 } 7015 } 7016 7017 void needGlobalAttributesUpdate(boolean force) { 7018 final AttachInfo ai = mAttachInfo; 7019 if (ai != null) { 7020 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 7021 || ai.mHasSystemUiListeners) { 7022 ai.mRecomputeGlobalAttributes = true; 7023 } 7024 } 7025 } 7026 7027 /** 7028 * Returns whether the device is currently in touch mode. Touch mode is entered 7029 * once the user begins interacting with the device by touch, and affects various 7030 * things like whether focus is always visible to the user. 7031 * 7032 * @return Whether the device is in touch mode. 7033 */ 7034 @ViewDebug.ExportedProperty 7035 public boolean isInTouchMode() { 7036 if (mAttachInfo != null) { 7037 return mAttachInfo.mInTouchMode; 7038 } else { 7039 return ViewRootImpl.isInTouchMode(); 7040 } 7041 } 7042 7043 /** 7044 * Returns the context the view is running in, through which it can 7045 * access the current theme, resources, etc. 7046 * 7047 * @return The view's Context. 7048 */ 7049 @ViewDebug.CapturedViewProperty 7050 public final Context getContext() { 7051 return mContext; 7052 } 7053 7054 /** 7055 * Handle a key event before it is processed by any input method 7056 * associated with the view hierarchy. This can be used to intercept 7057 * key events in special situations before the IME consumes them; a 7058 * typical example would be handling the BACK key to update the application's 7059 * UI instead of allowing the IME to see it and close itself. 7060 * 7061 * @param keyCode The value in event.getKeyCode(). 7062 * @param event Description of the key event. 7063 * @return If you handled the event, return true. If you want to allow the 7064 * event to be handled by the next receiver, return false. 7065 */ 7066 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 7067 return false; 7068 } 7069 7070 /** 7071 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 7072 * KeyEvent.Callback.onKeyDown()}: perform press of the view 7073 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 7074 * is released, if the view is enabled and clickable. 7075 * 7076 * @param keyCode A key code that represents the button pressed, from 7077 * {@link android.view.KeyEvent}. 7078 * @param event The KeyEvent object that defines the button action. 7079 */ 7080 public boolean onKeyDown(int keyCode, KeyEvent event) { 7081 boolean result = false; 7082 7083 switch (keyCode) { 7084 case KeyEvent.KEYCODE_DPAD_CENTER: 7085 case KeyEvent.KEYCODE_ENTER: { 7086 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7087 return true; 7088 } 7089 // Long clickable items don't necessarily have to be clickable 7090 if (((mViewFlags & CLICKABLE) == CLICKABLE || 7091 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 7092 (event.getRepeatCount() == 0)) { 7093 setPressed(true); 7094 checkForLongClick(0); 7095 return true; 7096 } 7097 break; 7098 } 7099 } 7100 return result; 7101 } 7102 7103 /** 7104 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 7105 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 7106 * the event). 7107 */ 7108 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 7109 return false; 7110 } 7111 7112 /** 7113 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 7114 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 7115 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 7116 * {@link KeyEvent#KEYCODE_ENTER} is released. 7117 * 7118 * @param keyCode A key code that represents the button pressed, from 7119 * {@link android.view.KeyEvent}. 7120 * @param event The KeyEvent object that defines the button action. 7121 */ 7122 public boolean onKeyUp(int keyCode, KeyEvent event) { 7123 boolean result = false; 7124 7125 switch (keyCode) { 7126 case KeyEvent.KEYCODE_DPAD_CENTER: 7127 case KeyEvent.KEYCODE_ENTER: { 7128 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 7129 return true; 7130 } 7131 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 7132 setPressed(false); 7133 7134 if (!mHasPerformedLongPress) { 7135 // This is a tap, so remove the longpress check 7136 removeLongPressCallback(); 7137 7138 result = performClick(); 7139 } 7140 } 7141 break; 7142 } 7143 } 7144 return result; 7145 } 7146 7147 /** 7148 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 7149 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 7150 * the event). 7151 * 7152 * @param keyCode A key code that represents the button pressed, from 7153 * {@link android.view.KeyEvent}. 7154 * @param repeatCount The number of times the action was made. 7155 * @param event The KeyEvent object that defines the button action. 7156 */ 7157 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 7158 return false; 7159 } 7160 7161 /** 7162 * Called on the focused view when a key shortcut event is not handled. 7163 * Override this method to implement local key shortcuts for the View. 7164 * Key shortcuts can also be implemented by setting the 7165 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 7166 * 7167 * @param keyCode The value in event.getKeyCode(). 7168 * @param event Description of the key event. 7169 * @return If you handled the event, return true. If you want to allow the 7170 * event to be handled by the next receiver, return false. 7171 */ 7172 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 7173 return false; 7174 } 7175 7176 /** 7177 * Check whether the called view is a text editor, in which case it 7178 * would make sense to automatically display a soft input window for 7179 * it. Subclasses should override this if they implement 7180 * {@link #onCreateInputConnection(EditorInfo)} to return true if 7181 * a call on that method would return a non-null InputConnection, and 7182 * they are really a first-class editor that the user would normally 7183 * start typing on when the go into a window containing your view. 7184 * 7185 * <p>The default implementation always returns false. This does 7186 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 7187 * will not be called or the user can not otherwise perform edits on your 7188 * view; it is just a hint to the system that this is not the primary 7189 * purpose of this view. 7190 * 7191 * @return Returns true if this view is a text editor, else false. 7192 */ 7193 public boolean onCheckIsTextEditor() { 7194 return false; 7195 } 7196 7197 /** 7198 * Create a new InputConnection for an InputMethod to interact 7199 * with the view. The default implementation returns null, since it doesn't 7200 * support input methods. You can override this to implement such support. 7201 * This is only needed for views that take focus and text input. 7202 * 7203 * <p>When implementing this, you probably also want to implement 7204 * {@link #onCheckIsTextEditor()} to indicate you will return a 7205 * non-null InputConnection. 7206 * 7207 * @param outAttrs Fill in with attribute information about the connection. 7208 */ 7209 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 7210 return null; 7211 } 7212 7213 /** 7214 * Called by the {@link android.view.inputmethod.InputMethodManager} 7215 * when a view who is not the current 7216 * input connection target is trying to make a call on the manager. The 7217 * default implementation returns false; you can override this to return 7218 * true for certain views if you are performing InputConnection proxying 7219 * to them. 7220 * @param view The View that is making the InputMethodManager call. 7221 * @return Return true to allow the call, false to reject. 7222 */ 7223 public boolean checkInputConnectionProxy(View view) { 7224 return false; 7225 } 7226 7227 /** 7228 * Show the context menu for this view. It is not safe to hold on to the 7229 * menu after returning from this method. 7230 * 7231 * You should normally not overload this method. Overload 7232 * {@link #onCreateContextMenu(ContextMenu)} or define an 7233 * {@link OnCreateContextMenuListener} to add items to the context menu. 7234 * 7235 * @param menu The context menu to populate 7236 */ 7237 public void createContextMenu(ContextMenu menu) { 7238 ContextMenuInfo menuInfo = getContextMenuInfo(); 7239 7240 // Sets the current menu info so all items added to menu will have 7241 // my extra info set. 7242 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 7243 7244 onCreateContextMenu(menu); 7245 ListenerInfo li = mListenerInfo; 7246 if (li != null && li.mOnCreateContextMenuListener != null) { 7247 li.mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 7248 } 7249 7250 // Clear the extra information so subsequent items that aren't mine don't 7251 // have my extra info. 7252 ((MenuBuilder)menu).setCurrentMenuInfo(null); 7253 7254 if (mParent != null) { 7255 mParent.createContextMenu(menu); 7256 } 7257 } 7258 7259 /** 7260 * Views should implement this if they have extra information to associate 7261 * with the context menu. The return result is supplied as a parameter to 7262 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 7263 * callback. 7264 * 7265 * @return Extra information about the item for which the context menu 7266 * should be shown. This information will vary across different 7267 * subclasses of View. 7268 */ 7269 protected ContextMenuInfo getContextMenuInfo() { 7270 return null; 7271 } 7272 7273 /** 7274 * Views should implement this if the view itself is going to add items to 7275 * the context menu. 7276 * 7277 * @param menu the context menu to populate 7278 */ 7279 protected void onCreateContextMenu(ContextMenu menu) { 7280 } 7281 7282 /** 7283 * Implement this method to handle trackball motion events. The 7284 * <em>relative</em> movement of the trackball since the last event 7285 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 7286 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 7287 * that a movement of 1 corresponds to the user pressing one DPAD key (so 7288 * they will often be fractional values, representing the more fine-grained 7289 * movement information available from a trackball). 7290 * 7291 * @param event The motion event. 7292 * @return True if the event was handled, false otherwise. 7293 */ 7294 public boolean onTrackballEvent(MotionEvent event) { 7295 return false; 7296 } 7297 7298 /** 7299 * Implement this method to handle generic motion events. 7300 * <p> 7301 * Generic motion events describe joystick movements, mouse hovers, track pad 7302 * touches, scroll wheel movements and other input events. The 7303 * {@link MotionEvent#getSource() source} of the motion event specifies 7304 * the class of input that was received. Implementations of this method 7305 * must examine the bits in the source before processing the event. 7306 * The following code example shows how this is done. 7307 * </p><p> 7308 * Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER} 7309 * are delivered to the view under the pointer. All other generic motion events are 7310 * delivered to the focused view. 7311 * </p> 7312 * <pre> public boolean onGenericMotionEvent(MotionEvent event) { 7313 * if ((event.getSource() & InputDevice.SOURCE_CLASS_JOYSTICK) != 0) { 7314 * if (event.getAction() == MotionEvent.ACTION_MOVE) { 7315 * // process the joystick movement... 7316 * return true; 7317 * } 7318 * } 7319 * if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) { 7320 * switch (event.getAction()) { 7321 * case MotionEvent.ACTION_HOVER_MOVE: 7322 * // process the mouse hover movement... 7323 * return true; 7324 * case MotionEvent.ACTION_SCROLL: 7325 * // process the scroll wheel movement... 7326 * return true; 7327 * } 7328 * } 7329 * return super.onGenericMotionEvent(event); 7330 * }</pre> 7331 * 7332 * @param event The generic motion event being processed. 7333 * @return True if the event was handled, false otherwise. 7334 */ 7335 public boolean onGenericMotionEvent(MotionEvent event) { 7336 return false; 7337 } 7338 7339 /** 7340 * Implement this method to handle hover events. 7341 * <p> 7342 * This method is called whenever a pointer is hovering into, over, or out of the 7343 * bounds of a view and the view is not currently being touched. 7344 * Hover events are represented as pointer events with action 7345 * {@link MotionEvent#ACTION_HOVER_ENTER}, {@link MotionEvent#ACTION_HOVER_MOVE}, 7346 * or {@link MotionEvent#ACTION_HOVER_EXIT}. 7347 * </p> 7348 * <ul> 7349 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_ENTER} 7350 * when the pointer enters the bounds of the view.</li> 7351 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_MOVE} 7352 * when the pointer has already entered the bounds of the view and has moved.</li> 7353 * <li>The view receives a hover event with action {@link MotionEvent#ACTION_HOVER_EXIT} 7354 * when the pointer has exited the bounds of the view or when the pointer is 7355 * about to go down due to a button click, tap, or similar user action that 7356 * causes the view to be touched.</li> 7357 * </ul> 7358 * <p> 7359 * The view should implement this method to return true to indicate that it is 7360 * handling the hover event, such as by changing its drawable state. 7361 * </p><p> 7362 * The default implementation calls {@link #setHovered} to update the hovered state 7363 * of the view when a hover enter or hover exit event is received, if the view 7364 * is enabled and is clickable. The default implementation also sends hover 7365 * accessibility events. 7366 * </p> 7367 * 7368 * @param event The motion event that describes the hover. 7369 * @return True if the view handled the hover event. 7370 * 7371 * @see #isHovered 7372 * @see #setHovered 7373 * @see #onHoverChanged 7374 */ 7375 public boolean onHoverEvent(MotionEvent event) { 7376 // The root view may receive hover (or touch) events that are outside the bounds of 7377 // the window. This code ensures that we only send accessibility events for 7378 // hovers that are actually within the bounds of the root view. 7379 final int action = event.getActionMasked(); 7380 if (!mSendingHoverAccessibilityEvents) { 7381 if ((action == MotionEvent.ACTION_HOVER_ENTER 7382 || action == MotionEvent.ACTION_HOVER_MOVE) 7383 && !hasHoveredChild() 7384 && pointInView(event.getX(), event.getY())) { 7385 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_ENTER); 7386 mSendingHoverAccessibilityEvents = true; 7387 requestAccessibilityFocusFromHover((int) event.getX(), (int) event.getY()); 7388 } 7389 } else { 7390 if (action == MotionEvent.ACTION_HOVER_EXIT 7391 || (action == MotionEvent.ACTION_MOVE 7392 && !pointInView(event.getX(), event.getY()))) { 7393 mSendingHoverAccessibilityEvents = false; 7394 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_HOVER_EXIT); 7395 // If the window does not have input focus we take away accessibility 7396 // focus as soon as the user stop hovering over the view. 7397 if (mAttachInfo != null && !mAttachInfo.mHasWindowFocus) { 7398 getViewRootImpl().setAccessibilityFocusedHost(null); 7399 } 7400 } 7401 } 7402 7403 if (isHoverable()) { 7404 switch (action) { 7405 case MotionEvent.ACTION_HOVER_ENTER: 7406 setHovered(true); 7407 break; 7408 case MotionEvent.ACTION_HOVER_EXIT: 7409 setHovered(false); 7410 break; 7411 } 7412 7413 // Dispatch the event to onGenericMotionEvent before returning true. 7414 // This is to provide compatibility with existing applications that 7415 // handled HOVER_MOVE events in onGenericMotionEvent and that would 7416 // break because of the new default handling for hoverable views 7417 // in onHoverEvent. 7418 // Note that onGenericMotionEvent will be called by default when 7419 // onHoverEvent returns false (refer to dispatchGenericMotionEvent). 7420 dispatchGenericMotionEventInternal(event); 7421 return true; 7422 } 7423 7424 return false; 7425 } 7426 7427 /** 7428 * Returns true if the view should handle {@link #onHoverEvent} 7429 * by calling {@link #setHovered} to change its hovered state. 7430 * 7431 * @return True if the view is hoverable. 7432 */ 7433 private boolean isHoverable() { 7434 final int viewFlags = mViewFlags; 7435 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7436 return false; 7437 } 7438 7439 return (viewFlags & CLICKABLE) == CLICKABLE 7440 || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 7441 } 7442 7443 /** 7444 * Returns true if the view is currently hovered. 7445 * 7446 * @return True if the view is currently hovered. 7447 * 7448 * @see #setHovered 7449 * @see #onHoverChanged 7450 */ 7451 @ViewDebug.ExportedProperty 7452 public boolean isHovered() { 7453 return (mPrivateFlags & HOVERED) != 0; 7454 } 7455 7456 /** 7457 * Sets whether the view is currently hovered. 7458 * <p> 7459 * Calling this method also changes the drawable state of the view. This 7460 * enables the view to react to hover by using different drawable resources 7461 * to change its appearance. 7462 * </p><p> 7463 * The {@link #onHoverChanged} method is called when the hovered state changes. 7464 * </p> 7465 * 7466 * @param hovered True if the view is hovered. 7467 * 7468 * @see #isHovered 7469 * @see #onHoverChanged 7470 */ 7471 public void setHovered(boolean hovered) { 7472 if (hovered) { 7473 if ((mPrivateFlags & HOVERED) == 0) { 7474 mPrivateFlags |= HOVERED; 7475 refreshDrawableState(); 7476 onHoverChanged(true); 7477 } 7478 } else { 7479 if ((mPrivateFlags & HOVERED) != 0) { 7480 mPrivateFlags &= ~HOVERED; 7481 refreshDrawableState(); 7482 onHoverChanged(false); 7483 } 7484 } 7485 } 7486 7487 /** 7488 * Implement this method to handle hover state changes. 7489 * <p> 7490 * This method is called whenever the hover state changes as a result of a 7491 * call to {@link #setHovered}. 7492 * </p> 7493 * 7494 * @param hovered The current hover state, as returned by {@link #isHovered}. 7495 * 7496 * @see #isHovered 7497 * @see #setHovered 7498 */ 7499 public void onHoverChanged(boolean hovered) { 7500 } 7501 7502 /** 7503 * Implement this method to handle touch screen motion events. 7504 * 7505 * @param event The motion event. 7506 * @return True if the event was handled, false otherwise. 7507 */ 7508 public boolean onTouchEvent(MotionEvent event) { 7509 final int viewFlags = mViewFlags; 7510 7511 if ((viewFlags & ENABLED_MASK) == DISABLED) { 7512 if (event.getAction() == MotionEvent.ACTION_UP && (mPrivateFlags & PRESSED) != 0) { 7513 setPressed(false); 7514 } 7515 // A disabled view that is clickable still consumes the touch 7516 // events, it just doesn't respond to them. 7517 return (((viewFlags & CLICKABLE) == CLICKABLE || 7518 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 7519 } 7520 7521 if (mTouchDelegate != null) { 7522 if (mTouchDelegate.onTouchEvent(event)) { 7523 return true; 7524 } 7525 } 7526 7527 if (((viewFlags & CLICKABLE) == CLICKABLE || 7528 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 7529 switch (event.getAction()) { 7530 case MotionEvent.ACTION_UP: 7531 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 7532 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 7533 // take focus if we don't have it already and we should in 7534 // touch mode. 7535 boolean focusTaken = false; 7536 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 7537 focusTaken = requestFocus(); 7538 } 7539 7540 if (prepressed) { 7541 // The button is being released before we actually 7542 // showed it as pressed. Make it show the pressed 7543 // state now (before scheduling the click) to ensure 7544 // the user sees it. 7545 setPressed(true); 7546 } 7547 7548 if (!mHasPerformedLongPress) { 7549 // This is a tap, so remove the longpress check 7550 removeLongPressCallback(); 7551 7552 // Only perform take click actions if we were in the pressed state 7553 if (!focusTaken) { 7554 // Use a Runnable and post this rather than calling 7555 // performClick directly. This lets other visual state 7556 // of the view update before click actions start. 7557 if (mPerformClick == null) { 7558 mPerformClick = new PerformClick(); 7559 } 7560 if (!post(mPerformClick)) { 7561 performClick(); 7562 } 7563 } 7564 } 7565 7566 if (mUnsetPressedState == null) { 7567 mUnsetPressedState = new UnsetPressedState(); 7568 } 7569 7570 if (prepressed) { 7571 postDelayed(mUnsetPressedState, 7572 ViewConfiguration.getPressedStateDuration()); 7573 } else if (!post(mUnsetPressedState)) { 7574 // If the post failed, unpress right now 7575 mUnsetPressedState.run(); 7576 } 7577 removeTapCallback(); 7578 } 7579 break; 7580 7581 case MotionEvent.ACTION_DOWN: 7582 mHasPerformedLongPress = false; 7583 7584 if (performButtonActionOnTouchDown(event)) { 7585 break; 7586 } 7587 7588 // Walk up the hierarchy to determine if we're inside a scrolling container. 7589 boolean isInScrollingContainer = isInScrollingContainer(); 7590 7591 // For views inside a scrolling container, delay the pressed feedback for 7592 // a short period in case this is a scroll. 7593 if (isInScrollingContainer) { 7594 mPrivateFlags |= PREPRESSED; 7595 if (mPendingCheckForTap == null) { 7596 mPendingCheckForTap = new CheckForTap(); 7597 } 7598 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 7599 } else { 7600 // Not inside a scrolling container, so show the feedback right away 7601 setPressed(true); 7602 checkForLongClick(0); 7603 } 7604 break; 7605 7606 case MotionEvent.ACTION_CANCEL: 7607 setPressed(false); 7608 removeTapCallback(); 7609 break; 7610 7611 case MotionEvent.ACTION_MOVE: 7612 final int x = (int) event.getX(); 7613 final int y = (int) event.getY(); 7614 7615 // Be lenient about moving outside of buttons 7616 if (!pointInView(x, y, mTouchSlop)) { 7617 // Outside button 7618 removeTapCallback(); 7619 if ((mPrivateFlags & PRESSED) != 0) { 7620 // Remove any future long press/tap checks 7621 removeLongPressCallback(); 7622 7623 setPressed(false); 7624 } 7625 } 7626 break; 7627 } 7628 return true; 7629 } 7630 7631 return false; 7632 } 7633 7634 /** 7635 * @hide 7636 */ 7637 public boolean isInScrollingContainer() { 7638 ViewParent p = getParent(); 7639 while (p != null && p instanceof ViewGroup) { 7640 if (((ViewGroup) p).shouldDelayChildPressedState()) { 7641 return true; 7642 } 7643 p = p.getParent(); 7644 } 7645 return false; 7646 } 7647 7648 /** 7649 * Remove the longpress detection timer. 7650 */ 7651 private void removeLongPressCallback() { 7652 if (mPendingCheckForLongPress != null) { 7653 removeCallbacks(mPendingCheckForLongPress); 7654 } 7655 } 7656 7657 /** 7658 * Remove the pending click action 7659 */ 7660 private void removePerformClickCallback() { 7661 if (mPerformClick != null) { 7662 removeCallbacks(mPerformClick); 7663 } 7664 } 7665 7666 /** 7667 * Remove the prepress detection timer. 7668 */ 7669 private void removeUnsetPressCallback() { 7670 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 7671 setPressed(false); 7672 removeCallbacks(mUnsetPressedState); 7673 } 7674 } 7675 7676 /** 7677 * Remove the tap detection timer. 7678 */ 7679 private void removeTapCallback() { 7680 if (mPendingCheckForTap != null) { 7681 mPrivateFlags &= ~PREPRESSED; 7682 removeCallbacks(mPendingCheckForTap); 7683 } 7684 } 7685 7686 /** 7687 * Cancels a pending long press. Your subclass can use this if you 7688 * want the context menu to come up if the user presses and holds 7689 * at the same place, but you don't want it to come up if they press 7690 * and then move around enough to cause scrolling. 7691 */ 7692 public void cancelLongPress() { 7693 removeLongPressCallback(); 7694 7695 /* 7696 * The prepressed state handled by the tap callback is a display 7697 * construct, but the tap callback will post a long press callback 7698 * less its own timeout. Remove it here. 7699 */ 7700 removeTapCallback(); 7701 } 7702 7703 /** 7704 * Remove the pending callback for sending a 7705 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 7706 */ 7707 private void removeSendViewScrolledAccessibilityEventCallback() { 7708 if (mSendViewScrolledAccessibilityEvent != null) { 7709 removeCallbacks(mSendViewScrolledAccessibilityEvent); 7710 } 7711 } 7712 7713 /** 7714 * Sets the TouchDelegate for this View. 7715 */ 7716 public void setTouchDelegate(TouchDelegate delegate) { 7717 mTouchDelegate = delegate; 7718 } 7719 7720 /** 7721 * Gets the TouchDelegate for this View. 7722 */ 7723 public TouchDelegate getTouchDelegate() { 7724 return mTouchDelegate; 7725 } 7726 7727 /** 7728 * Set flags controlling behavior of this view. 7729 * 7730 * @param flags Constant indicating the value which should be set 7731 * @param mask Constant indicating the bit range that should be changed 7732 */ 7733 void setFlags(int flags, int mask) { 7734 int old = mViewFlags; 7735 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 7736 7737 int changed = mViewFlags ^ old; 7738 if (changed == 0) { 7739 return; 7740 } 7741 int privateFlags = mPrivateFlags; 7742 7743 /* Check if the FOCUSABLE bit has changed */ 7744 if (((changed & FOCUSABLE_MASK) != 0) && 7745 ((privateFlags & HAS_BOUNDS) !=0)) { 7746 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 7747 && ((privateFlags & FOCUSED) != 0)) { 7748 /* Give up focus if we are no longer focusable */ 7749 clearFocus(); 7750 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 7751 && ((privateFlags & FOCUSED) == 0)) { 7752 /* 7753 * Tell the view system that we are now available to take focus 7754 * if no one else already has it. 7755 */ 7756 if (mParent != null) mParent.focusableViewAvailable(this); 7757 } 7758 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 7759 notifyAccessibilityStateChanged(); 7760 } 7761 } 7762 7763 if ((flags & VISIBILITY_MASK) == VISIBLE) { 7764 if ((changed & VISIBILITY_MASK) != 0) { 7765 /* 7766 * If this view is becoming visible, invalidate it in case it changed while 7767 * it was not visible. Marking it drawn ensures that the invalidation will 7768 * go through. 7769 */ 7770 mPrivateFlags |= DRAWN; 7771 invalidate(true); 7772 7773 needGlobalAttributesUpdate(true); 7774 7775 // a view becoming visible is worth notifying the parent 7776 // about in case nothing has focus. even if this specific view 7777 // isn't focusable, it may contain something that is, so let 7778 // the root view try to give this focus if nothing else does. 7779 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 7780 mParent.focusableViewAvailable(this); 7781 } 7782 } 7783 } 7784 7785 /* Check if the GONE bit has changed */ 7786 if ((changed & GONE) != 0) { 7787 needGlobalAttributesUpdate(false); 7788 requestLayout(); 7789 7790 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 7791 if (hasFocus()) clearFocus(); 7792 clearAccessibilityFocus(); 7793 destroyDrawingCache(); 7794 if (mParent instanceof View) { 7795 // GONE views noop invalidation, so invalidate the parent 7796 ((View) mParent).invalidate(true); 7797 } 7798 // Mark the view drawn to ensure that it gets invalidated properly the next 7799 // time it is visible and gets invalidated 7800 mPrivateFlags |= DRAWN; 7801 } 7802 if (mAttachInfo != null) { 7803 mAttachInfo.mViewVisibilityChanged = true; 7804 } 7805 } 7806 7807 /* Check if the VISIBLE bit has changed */ 7808 if ((changed & INVISIBLE) != 0) { 7809 needGlobalAttributesUpdate(false); 7810 /* 7811 * If this view is becoming invisible, set the DRAWN flag so that 7812 * the next invalidate() will not be skipped. 7813 */ 7814 mPrivateFlags |= DRAWN; 7815 7816 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 7817 // root view becoming invisible shouldn't clear focus and accessibility focus 7818 if (getRootView() != this) { 7819 clearFocus(); 7820 clearAccessibilityFocus(); 7821 } 7822 } 7823 if (mAttachInfo != null) { 7824 mAttachInfo.mViewVisibilityChanged = true; 7825 } 7826 } 7827 7828 if ((changed & VISIBILITY_MASK) != 0) { 7829 if (mParent instanceof ViewGroup) { 7830 ((ViewGroup) mParent).onChildVisibilityChanged(this, 7831 (changed & VISIBILITY_MASK), (flags & VISIBILITY_MASK)); 7832 ((View) mParent).invalidate(true); 7833 } else if (mParent != null) { 7834 mParent.invalidateChild(this, null); 7835 } 7836 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 7837 } 7838 7839 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 7840 destroyDrawingCache(); 7841 } 7842 7843 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 7844 destroyDrawingCache(); 7845 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7846 invalidateParentCaches(); 7847 } 7848 7849 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 7850 destroyDrawingCache(); 7851 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7852 } 7853 7854 if ((changed & DRAW_MASK) != 0) { 7855 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 7856 if (mBackground != null) { 7857 mPrivateFlags &= ~SKIP_DRAW; 7858 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 7859 } else { 7860 mPrivateFlags |= SKIP_DRAW; 7861 } 7862 } else { 7863 mPrivateFlags &= ~SKIP_DRAW; 7864 } 7865 requestLayout(); 7866 invalidate(true); 7867 } 7868 7869 if ((changed & KEEP_SCREEN_ON) != 0) { 7870 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 7871 mParent.recomputeViewAttributes(this); 7872 } 7873 } 7874 7875 if (AccessibilityManager.getInstance(mContext).isEnabled() 7876 && ((changed & FOCUSABLE) != 0 || (changed & CLICKABLE) != 0 7877 || (changed & LONG_CLICKABLE) != 0 || (changed & ENABLED) != 0)) { 7878 notifyAccessibilityStateChanged(); 7879 } 7880 } 7881 7882 /** 7883 * Change the view's z order in the tree, so it's on top of other sibling 7884 * views 7885 */ 7886 public void bringToFront() { 7887 if (mParent != null) { 7888 mParent.bringChildToFront(this); 7889 } 7890 } 7891 7892 /** 7893 * This is called in response to an internal scroll in this view (i.e., the 7894 * view scrolled its own contents). This is typically as a result of 7895 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 7896 * called. 7897 * 7898 * @param l Current horizontal scroll origin. 7899 * @param t Current vertical scroll origin. 7900 * @param oldl Previous horizontal scroll origin. 7901 * @param oldt Previous vertical scroll origin. 7902 */ 7903 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 7904 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 7905 postSendViewScrolledAccessibilityEventCallback(); 7906 } 7907 7908 mBackgroundSizeChanged = true; 7909 7910 final AttachInfo ai = mAttachInfo; 7911 if (ai != null) { 7912 ai.mViewScrollChanged = true; 7913 } 7914 } 7915 7916 /** 7917 * Interface definition for a callback to be invoked when the layout bounds of a view 7918 * changes due to layout processing. 7919 */ 7920 public interface OnLayoutChangeListener { 7921 /** 7922 * Called when the focus state of a view has changed. 7923 * 7924 * @param v The view whose state has changed. 7925 * @param left The new value of the view's left property. 7926 * @param top The new value of the view's top property. 7927 * @param right The new value of the view's right property. 7928 * @param bottom The new value of the view's bottom property. 7929 * @param oldLeft The previous value of the view's left property. 7930 * @param oldTop The previous value of the view's top property. 7931 * @param oldRight The previous value of the view's right property. 7932 * @param oldBottom The previous value of the view's bottom property. 7933 */ 7934 void onLayoutChange(View v, int left, int top, int right, int bottom, 7935 int oldLeft, int oldTop, int oldRight, int oldBottom); 7936 } 7937 7938 /** 7939 * This is called during layout when the size of this view has changed. If 7940 * you were just added to the view hierarchy, you're called with the old 7941 * values of 0. 7942 * 7943 * @param w Current width of this view. 7944 * @param h Current height of this view. 7945 * @param oldw Old width of this view. 7946 * @param oldh Old height of this view. 7947 */ 7948 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 7949 } 7950 7951 /** 7952 * Called by draw to draw the child views. This may be overridden 7953 * by derived classes to gain control just before its children are drawn 7954 * (but after its own view has been drawn). 7955 * @param canvas the canvas on which to draw the view 7956 */ 7957 protected void dispatchDraw(Canvas canvas) { 7958 7959 } 7960 7961 /** 7962 * Gets the parent of this view. Note that the parent is a 7963 * ViewParent and not necessarily a View. 7964 * 7965 * @return Parent of this view. 7966 */ 7967 public final ViewParent getParent() { 7968 return mParent; 7969 } 7970 7971 /** 7972 * Set the horizontal scrolled position of your view. This will cause a call to 7973 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7974 * invalidated. 7975 * @param value the x position to scroll to 7976 */ 7977 public void setScrollX(int value) { 7978 scrollTo(value, mScrollY); 7979 } 7980 7981 /** 7982 * Set the vertical scrolled position of your view. This will cause a call to 7983 * {@link #onScrollChanged(int, int, int, int)} and the view will be 7984 * invalidated. 7985 * @param value the y position to scroll to 7986 */ 7987 public void setScrollY(int value) { 7988 scrollTo(mScrollX, value); 7989 } 7990 7991 /** 7992 * Return the scrolled left position of this view. This is the left edge of 7993 * the displayed part of your view. You do not need to draw any pixels 7994 * farther left, since those are outside of the frame of your view on 7995 * screen. 7996 * 7997 * @return The left edge of the displayed part of your view, in pixels. 7998 */ 7999 public final int getScrollX() { 8000 return mScrollX; 8001 } 8002 8003 /** 8004 * Return the scrolled top position of this view. This is the top edge of 8005 * the displayed part of your view. You do not need to draw any pixels above 8006 * it, since those are outside of the frame of your view on screen. 8007 * 8008 * @return The top edge of the displayed part of your view, in pixels. 8009 */ 8010 public final int getScrollY() { 8011 return mScrollY; 8012 } 8013 8014 /** 8015 * Return the width of the your view. 8016 * 8017 * @return The width of your view, in pixels. 8018 */ 8019 @ViewDebug.ExportedProperty(category = "layout") 8020 public final int getWidth() { 8021 return mRight - mLeft; 8022 } 8023 8024 /** 8025 * Return the height of your view. 8026 * 8027 * @return The height of your view, in pixels. 8028 */ 8029 @ViewDebug.ExportedProperty(category = "layout") 8030 public final int getHeight() { 8031 return mBottom - mTop; 8032 } 8033 8034 /** 8035 * Return the visible drawing bounds of your view. Fills in the output 8036 * rectangle with the values from getScrollX(), getScrollY(), 8037 * getWidth(), and getHeight(). 8038 * 8039 * @param outRect The (scrolled) drawing bounds of the view. 8040 */ 8041 public void getDrawingRect(Rect outRect) { 8042 outRect.left = mScrollX; 8043 outRect.top = mScrollY; 8044 outRect.right = mScrollX + (mRight - mLeft); 8045 outRect.bottom = mScrollY + (mBottom - mTop); 8046 } 8047 8048 /** 8049 * Like {@link #getMeasuredWidthAndState()}, but only returns the 8050 * raw width component (that is the result is masked by 8051 * {@link #MEASURED_SIZE_MASK}). 8052 * 8053 * @return The raw measured width of this view. 8054 */ 8055 public final int getMeasuredWidth() { 8056 return mMeasuredWidth & MEASURED_SIZE_MASK; 8057 } 8058 8059 /** 8060 * Return the full width measurement information for this view as computed 8061 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8062 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8063 * This should be used during measurement and layout calculations only. Use 8064 * {@link #getWidth()} to see how wide a view is after layout. 8065 * 8066 * @return The measured width of this view as a bit mask. 8067 */ 8068 public final int getMeasuredWidthAndState() { 8069 return mMeasuredWidth; 8070 } 8071 8072 /** 8073 * Like {@link #getMeasuredHeightAndState()}, but only returns the 8074 * raw width component (that is the result is masked by 8075 * {@link #MEASURED_SIZE_MASK}). 8076 * 8077 * @return The raw measured height of this view. 8078 */ 8079 public final int getMeasuredHeight() { 8080 return mMeasuredHeight & MEASURED_SIZE_MASK; 8081 } 8082 8083 /** 8084 * Return the full height measurement information for this view as computed 8085 * by the most recent call to {@link #measure(int, int)}. This result is a bit mask 8086 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 8087 * This should be used during measurement and layout calculations only. Use 8088 * {@link #getHeight()} to see how wide a view is after layout. 8089 * 8090 * @return The measured width of this view as a bit mask. 8091 */ 8092 public final int getMeasuredHeightAndState() { 8093 return mMeasuredHeight; 8094 } 8095 8096 /** 8097 * Return only the state bits of {@link #getMeasuredWidthAndState()} 8098 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 8099 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 8100 * and the height component is at the shifted bits 8101 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 8102 */ 8103 public final int getMeasuredState() { 8104 return (mMeasuredWidth&MEASURED_STATE_MASK) 8105 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 8106 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 8107 } 8108 8109 /** 8110 * The transform matrix of this view, which is calculated based on the current 8111 * roation, scale, and pivot properties. 8112 * 8113 * @see #getRotation() 8114 * @see #getScaleX() 8115 * @see #getScaleY() 8116 * @see #getPivotX() 8117 * @see #getPivotY() 8118 * @return The current transform matrix for the view 8119 */ 8120 public Matrix getMatrix() { 8121 if (mTransformationInfo != null) { 8122 updateMatrix(); 8123 return mTransformationInfo.mMatrix; 8124 } 8125 return Matrix.IDENTITY_MATRIX; 8126 } 8127 8128 /** 8129 * Utility function to determine if the value is far enough away from zero to be 8130 * considered non-zero. 8131 * @param value A floating point value to check for zero-ness 8132 * @return whether the passed-in value is far enough away from zero to be considered non-zero 8133 */ 8134 private static boolean nonzero(float value) { 8135 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 8136 } 8137 8138 /** 8139 * Returns true if the transform matrix is the identity matrix. 8140 * Recomputes the matrix if necessary. 8141 * 8142 * @return True if the transform matrix is the identity matrix, false otherwise. 8143 */ 8144 final boolean hasIdentityMatrix() { 8145 if (mTransformationInfo != null) { 8146 updateMatrix(); 8147 return mTransformationInfo.mMatrixIsIdentity; 8148 } 8149 return true; 8150 } 8151 8152 void ensureTransformationInfo() { 8153 if (mTransformationInfo == null) { 8154 mTransformationInfo = new TransformationInfo(); 8155 } 8156 } 8157 8158 /** 8159 * Recomputes the transform matrix if necessary. 8160 */ 8161 private void updateMatrix() { 8162 final TransformationInfo info = mTransformationInfo; 8163 if (info == null) { 8164 return; 8165 } 8166 if (info.mMatrixDirty) { 8167 // transform-related properties have changed since the last time someone 8168 // asked for the matrix; recalculate it with the current values 8169 8170 // Figure out if we need to update the pivot point 8171 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8172 if ((mRight - mLeft) != info.mPrevWidth || (mBottom - mTop) != info.mPrevHeight) { 8173 info.mPrevWidth = mRight - mLeft; 8174 info.mPrevHeight = mBottom - mTop; 8175 info.mPivotX = info.mPrevWidth / 2f; 8176 info.mPivotY = info.mPrevHeight / 2f; 8177 } 8178 } 8179 info.mMatrix.reset(); 8180 if (!nonzero(info.mRotationX) && !nonzero(info.mRotationY)) { 8181 info.mMatrix.setTranslate(info.mTranslationX, info.mTranslationY); 8182 info.mMatrix.preRotate(info.mRotation, info.mPivotX, info.mPivotY); 8183 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8184 } else { 8185 if (info.mCamera == null) { 8186 info.mCamera = new Camera(); 8187 info.matrix3D = new Matrix(); 8188 } 8189 info.mCamera.save(); 8190 info.mMatrix.preScale(info.mScaleX, info.mScaleY, info.mPivotX, info.mPivotY); 8191 info.mCamera.rotate(info.mRotationX, info.mRotationY, -info.mRotation); 8192 info.mCamera.getMatrix(info.matrix3D); 8193 info.matrix3D.preTranslate(-info.mPivotX, -info.mPivotY); 8194 info.matrix3D.postTranslate(info.mPivotX + info.mTranslationX, 8195 info.mPivotY + info.mTranslationY); 8196 info.mMatrix.postConcat(info.matrix3D); 8197 info.mCamera.restore(); 8198 } 8199 info.mMatrixDirty = false; 8200 info.mMatrixIsIdentity = info.mMatrix.isIdentity(); 8201 info.mInverseMatrixDirty = true; 8202 } 8203 } 8204 8205 /** 8206 * Utility method to retrieve the inverse of the current mMatrix property. 8207 * We cache the matrix to avoid recalculating it when transform properties 8208 * have not changed. 8209 * 8210 * @return The inverse of the current matrix of this view. 8211 */ 8212 final Matrix getInverseMatrix() { 8213 final TransformationInfo info = mTransformationInfo; 8214 if (info != null) { 8215 updateMatrix(); 8216 if (info.mInverseMatrixDirty) { 8217 if (info.mInverseMatrix == null) { 8218 info.mInverseMatrix = new Matrix(); 8219 } 8220 info.mMatrix.invert(info.mInverseMatrix); 8221 info.mInverseMatrixDirty = false; 8222 } 8223 return info.mInverseMatrix; 8224 } 8225 return Matrix.IDENTITY_MATRIX; 8226 } 8227 8228 /** 8229 * Gets the distance along the Z axis from the camera to this view. 8230 * 8231 * @see #setCameraDistance(float) 8232 * 8233 * @return The distance along the Z axis. 8234 */ 8235 public float getCameraDistance() { 8236 ensureTransformationInfo(); 8237 final float dpi = mResources.getDisplayMetrics().densityDpi; 8238 final TransformationInfo info = mTransformationInfo; 8239 if (info.mCamera == null) { 8240 info.mCamera = new Camera(); 8241 info.matrix3D = new Matrix(); 8242 } 8243 return -(info.mCamera.getLocationZ() * dpi); 8244 } 8245 8246 /** 8247 * <p>Sets the distance along the Z axis (orthogonal to the X/Y plane on which 8248 * views are drawn) from the camera to this view. The camera's distance 8249 * affects 3D transformations, for instance rotations around the X and Y 8250 * axis. If the rotationX or rotationY properties are changed and this view is 8251 * large (more than half the size of the screen), it is recommended to always 8252 * use a camera distance that's greater than the height (X axis rotation) or 8253 * the width (Y axis rotation) of this view.</p> 8254 * 8255 * <p>The distance of the camera from the view plane can have an affect on the 8256 * perspective distortion of the view when it is rotated around the x or y axis. 8257 * For example, a large distance will result in a large viewing angle, and there 8258 * will not be much perspective distortion of the view as it rotates. A short 8259 * distance may cause much more perspective distortion upon rotation, and can 8260 * also result in some drawing artifacts if the rotated view ends up partially 8261 * behind the camera (which is why the recommendation is to use a distance at 8262 * least as far as the size of the view, if the view is to be rotated.)</p> 8263 * 8264 * <p>The distance is expressed in "depth pixels." The default distance depends 8265 * on the screen density. For instance, on a medium density display, the 8266 * default distance is 1280. On a high density display, the default distance 8267 * is 1920.</p> 8268 * 8269 * <p>If you want to specify a distance that leads to visually consistent 8270 * results across various densities, use the following formula:</p> 8271 * <pre> 8272 * float scale = context.getResources().getDisplayMetrics().density; 8273 * view.setCameraDistance(distance * scale); 8274 * </pre> 8275 * 8276 * <p>The density scale factor of a high density display is 1.5, 8277 * and 1920 = 1280 * 1.5.</p> 8278 * 8279 * @param distance The distance in "depth pixels", if negative the opposite 8280 * value is used 8281 * 8282 * @see #setRotationX(float) 8283 * @see #setRotationY(float) 8284 */ 8285 public void setCameraDistance(float distance) { 8286 invalidateViewProperty(true, false); 8287 8288 ensureTransformationInfo(); 8289 final float dpi = mResources.getDisplayMetrics().densityDpi; 8290 final TransformationInfo info = mTransformationInfo; 8291 if (info.mCamera == null) { 8292 info.mCamera = new Camera(); 8293 info.matrix3D = new Matrix(); 8294 } 8295 8296 info.mCamera.setLocation(0.0f, 0.0f, -Math.abs(distance) / dpi); 8297 info.mMatrixDirty = true; 8298 8299 invalidateViewProperty(false, false); 8300 if (mDisplayList != null) { 8301 mDisplayList.setCameraDistance(-Math.abs(distance) / dpi); 8302 } 8303 } 8304 8305 /** 8306 * The degrees that the view is rotated around the pivot point. 8307 * 8308 * @see #setRotation(float) 8309 * @see #getPivotX() 8310 * @see #getPivotY() 8311 * 8312 * @return The degrees of rotation. 8313 */ 8314 @ViewDebug.ExportedProperty(category = "drawing") 8315 public float getRotation() { 8316 return mTransformationInfo != null ? mTransformationInfo.mRotation : 0; 8317 } 8318 8319 /** 8320 * Sets the degrees that the view is rotated around the pivot point. Increasing values 8321 * result in clockwise rotation. 8322 * 8323 * @param rotation The degrees of rotation. 8324 * 8325 * @see #getRotation() 8326 * @see #getPivotX() 8327 * @see #getPivotY() 8328 * @see #setRotationX(float) 8329 * @see #setRotationY(float) 8330 * 8331 * @attr ref android.R.styleable#View_rotation 8332 */ 8333 public void setRotation(float rotation) { 8334 ensureTransformationInfo(); 8335 final TransformationInfo info = mTransformationInfo; 8336 if (info.mRotation != rotation) { 8337 // Double-invalidation is necessary to capture view's old and new areas 8338 invalidateViewProperty(true, false); 8339 info.mRotation = rotation; 8340 info.mMatrixDirty = true; 8341 invalidateViewProperty(false, true); 8342 if (mDisplayList != null) { 8343 mDisplayList.setRotation(rotation); 8344 } 8345 } 8346 } 8347 8348 /** 8349 * The degrees that the view is rotated around the vertical axis through the pivot point. 8350 * 8351 * @see #getPivotX() 8352 * @see #getPivotY() 8353 * @see #setRotationY(float) 8354 * 8355 * @return The degrees of Y rotation. 8356 */ 8357 @ViewDebug.ExportedProperty(category = "drawing") 8358 public float getRotationY() { 8359 return mTransformationInfo != null ? mTransformationInfo.mRotationY : 0; 8360 } 8361 8362 /** 8363 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 8364 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 8365 * down the y axis. 8366 * 8367 * When rotating large views, it is recommended to adjust the camera distance 8368 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8369 * 8370 * @param rotationY The degrees of Y rotation. 8371 * 8372 * @see #getRotationY() 8373 * @see #getPivotX() 8374 * @see #getPivotY() 8375 * @see #setRotation(float) 8376 * @see #setRotationX(float) 8377 * @see #setCameraDistance(float) 8378 * 8379 * @attr ref android.R.styleable#View_rotationY 8380 */ 8381 public void setRotationY(float rotationY) { 8382 ensureTransformationInfo(); 8383 final TransformationInfo info = mTransformationInfo; 8384 if (info.mRotationY != rotationY) { 8385 invalidateViewProperty(true, false); 8386 info.mRotationY = rotationY; 8387 info.mMatrixDirty = true; 8388 invalidateViewProperty(false, true); 8389 if (mDisplayList != null) { 8390 mDisplayList.setRotationY(rotationY); 8391 } 8392 } 8393 } 8394 8395 /** 8396 * The degrees that the view is rotated around the horizontal axis through the pivot point. 8397 * 8398 * @see #getPivotX() 8399 * @see #getPivotY() 8400 * @see #setRotationX(float) 8401 * 8402 * @return The degrees of X rotation. 8403 */ 8404 @ViewDebug.ExportedProperty(category = "drawing") 8405 public float getRotationX() { 8406 return mTransformationInfo != null ? mTransformationInfo.mRotationX : 0; 8407 } 8408 8409 /** 8410 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 8411 * Increasing values result in clockwise rotation from the viewpoint of looking down the 8412 * x axis. 8413 * 8414 * When rotating large views, it is recommended to adjust the camera distance 8415 * accordingly. Refer to {@link #setCameraDistance(float)} for more information. 8416 * 8417 * @param rotationX The degrees of X rotation. 8418 * 8419 * @see #getRotationX() 8420 * @see #getPivotX() 8421 * @see #getPivotY() 8422 * @see #setRotation(float) 8423 * @see #setRotationY(float) 8424 * @see #setCameraDistance(float) 8425 * 8426 * @attr ref android.R.styleable#View_rotationX 8427 */ 8428 public void setRotationX(float rotationX) { 8429 ensureTransformationInfo(); 8430 final TransformationInfo info = mTransformationInfo; 8431 if (info.mRotationX != rotationX) { 8432 invalidateViewProperty(true, false); 8433 info.mRotationX = rotationX; 8434 info.mMatrixDirty = true; 8435 invalidateViewProperty(false, true); 8436 if (mDisplayList != null) { 8437 mDisplayList.setRotationX(rotationX); 8438 } 8439 } 8440 } 8441 8442 /** 8443 * The amount that the view is scaled in x around the pivot point, as a proportion of 8444 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 8445 * 8446 * <p>By default, this is 1.0f. 8447 * 8448 * @see #getPivotX() 8449 * @see #getPivotY() 8450 * @return The scaling factor. 8451 */ 8452 @ViewDebug.ExportedProperty(category = "drawing") 8453 public float getScaleX() { 8454 return mTransformationInfo != null ? mTransformationInfo.mScaleX : 1; 8455 } 8456 8457 /** 8458 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 8459 * the view's unscaled width. A value of 1 means that no scaling is applied. 8460 * 8461 * @param scaleX The scaling factor. 8462 * @see #getPivotX() 8463 * @see #getPivotY() 8464 * 8465 * @attr ref android.R.styleable#View_scaleX 8466 */ 8467 public void setScaleX(float scaleX) { 8468 ensureTransformationInfo(); 8469 final TransformationInfo info = mTransformationInfo; 8470 if (info.mScaleX != scaleX) { 8471 invalidateViewProperty(true, false); 8472 info.mScaleX = scaleX; 8473 info.mMatrixDirty = true; 8474 invalidateViewProperty(false, true); 8475 if (mDisplayList != null) { 8476 mDisplayList.setScaleX(scaleX); 8477 } 8478 } 8479 } 8480 8481 /** 8482 * The amount that the view is scaled in y around the pivot point, as a proportion of 8483 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 8484 * 8485 * <p>By default, this is 1.0f. 8486 * 8487 * @see #getPivotX() 8488 * @see #getPivotY() 8489 * @return The scaling factor. 8490 */ 8491 @ViewDebug.ExportedProperty(category = "drawing") 8492 public float getScaleY() { 8493 return mTransformationInfo != null ? mTransformationInfo.mScaleY : 1; 8494 } 8495 8496 /** 8497 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 8498 * the view's unscaled width. A value of 1 means that no scaling is applied. 8499 * 8500 * @param scaleY The scaling factor. 8501 * @see #getPivotX() 8502 * @see #getPivotY() 8503 * 8504 * @attr ref android.R.styleable#View_scaleY 8505 */ 8506 public void setScaleY(float scaleY) { 8507 ensureTransformationInfo(); 8508 final TransformationInfo info = mTransformationInfo; 8509 if (info.mScaleY != scaleY) { 8510 invalidateViewProperty(true, false); 8511 info.mScaleY = scaleY; 8512 info.mMatrixDirty = true; 8513 invalidateViewProperty(false, true); 8514 if (mDisplayList != null) { 8515 mDisplayList.setScaleY(scaleY); 8516 } 8517 } 8518 } 8519 8520 /** 8521 * The x location of the point around which the view is {@link #setRotation(float) rotated} 8522 * and {@link #setScaleX(float) scaled}. 8523 * 8524 * @see #getRotation() 8525 * @see #getScaleX() 8526 * @see #getScaleY() 8527 * @see #getPivotY() 8528 * @return The x location of the pivot point. 8529 * 8530 * @attr ref android.R.styleable#View_transformPivotX 8531 */ 8532 @ViewDebug.ExportedProperty(category = "drawing") 8533 public float getPivotX() { 8534 return mTransformationInfo != null ? mTransformationInfo.mPivotX : 0; 8535 } 8536 8537 /** 8538 * Sets the x location of the point around which the view is 8539 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 8540 * By default, the pivot point is centered on the object. 8541 * Setting this property disables this behavior and causes the view to use only the 8542 * explicitly set pivotX and pivotY values. 8543 * 8544 * @param pivotX The x location of the pivot point. 8545 * @see #getRotation() 8546 * @see #getScaleX() 8547 * @see #getScaleY() 8548 * @see #getPivotY() 8549 * 8550 * @attr ref android.R.styleable#View_transformPivotX 8551 */ 8552 public void setPivotX(float pivotX) { 8553 ensureTransformationInfo(); 8554 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8555 final TransformationInfo info = mTransformationInfo; 8556 if (info.mPivotX != pivotX) { 8557 invalidateViewProperty(true, false); 8558 info.mPivotX = pivotX; 8559 info.mMatrixDirty = true; 8560 invalidateViewProperty(false, true); 8561 if (mDisplayList != null) { 8562 mDisplayList.setPivotX(pivotX); 8563 } 8564 } 8565 } 8566 8567 /** 8568 * The y location of the point around which the view is {@link #setRotation(float) rotated} 8569 * and {@link #setScaleY(float) scaled}. 8570 * 8571 * @see #getRotation() 8572 * @see #getScaleX() 8573 * @see #getScaleY() 8574 * @see #getPivotY() 8575 * @return The y location of the pivot point. 8576 * 8577 * @attr ref android.R.styleable#View_transformPivotY 8578 */ 8579 @ViewDebug.ExportedProperty(category = "drawing") 8580 public float getPivotY() { 8581 return mTransformationInfo != null ? mTransformationInfo.mPivotY : 0; 8582 } 8583 8584 /** 8585 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 8586 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 8587 * Setting this property disables this behavior and causes the view to use only the 8588 * explicitly set pivotX and pivotY values. 8589 * 8590 * @param pivotY The y location of the pivot point. 8591 * @see #getRotation() 8592 * @see #getScaleX() 8593 * @see #getScaleY() 8594 * @see #getPivotY() 8595 * 8596 * @attr ref android.R.styleable#View_transformPivotY 8597 */ 8598 public void setPivotY(float pivotY) { 8599 ensureTransformationInfo(); 8600 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 8601 final TransformationInfo info = mTransformationInfo; 8602 if (info.mPivotY != pivotY) { 8603 invalidateViewProperty(true, false); 8604 info.mPivotY = pivotY; 8605 info.mMatrixDirty = true; 8606 invalidateViewProperty(false, true); 8607 if (mDisplayList != null) { 8608 mDisplayList.setPivotY(pivotY); 8609 } 8610 } 8611 } 8612 8613 /** 8614 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 8615 * completely transparent and 1 means the view is completely opaque. 8616 * 8617 * <p>By default this is 1.0f. 8618 * @return The opacity of the view. 8619 */ 8620 @ViewDebug.ExportedProperty(category = "drawing") 8621 public float getAlpha() { 8622 return mTransformationInfo != null ? mTransformationInfo.mAlpha : 1; 8623 } 8624 8625 /** 8626 * Returns whether this View has content which overlaps. This function, intended to be 8627 * overridden by specific View types, is an optimization when alpha is set on a view. If 8628 * rendering overlaps in a view with alpha < 1, that view is drawn to an offscreen buffer 8629 * and then composited it into place, which can be expensive. If the view has no overlapping 8630 * rendering, the view can draw each primitive with the appropriate alpha value directly. 8631 * An example of overlapping rendering is a TextView with a background image, such as a 8632 * Button. An example of non-overlapping rendering is a TextView with no background, or 8633 * an ImageView with only the foreground image. The default implementation returns true; 8634 * subclasses should override if they have cases which can be optimized. 8635 * 8636 * @return true if the content in this view might overlap, false otherwise. 8637 */ 8638 public boolean hasOverlappingRendering() { 8639 return true; 8640 } 8641 8642 /** 8643 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 8644 * completely transparent and 1 means the view is completely opaque.</p> 8645 * 8646 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 8647 * responsible for applying the opacity itself. Otherwise, calling this method is 8648 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 8649 * setting a hardware layer.</p> 8650 * 8651 * <p>Note that setting alpha to a translucent value (0 < alpha < 1) may have 8652 * performance implications. It is generally best to use the alpha property sparingly and 8653 * transiently, as in the case of fading animations.</p> 8654 * 8655 * @param alpha The opacity of the view. 8656 * 8657 * @see #setLayerType(int, android.graphics.Paint) 8658 * 8659 * @attr ref android.R.styleable#View_alpha 8660 */ 8661 public void setAlpha(float alpha) { 8662 ensureTransformationInfo(); 8663 if (mTransformationInfo.mAlpha != alpha) { 8664 mTransformationInfo.mAlpha = alpha; 8665 if (onSetAlpha((int) (alpha * 255))) { 8666 mPrivateFlags |= ALPHA_SET; 8667 // subclass is handling alpha - don't optimize rendering cache invalidation 8668 invalidateParentCaches(); 8669 invalidate(true); 8670 } else { 8671 mPrivateFlags &= ~ALPHA_SET; 8672 invalidateViewProperty(true, false); 8673 if (mDisplayList != null) { 8674 mDisplayList.setAlpha(alpha); 8675 } 8676 } 8677 } 8678 } 8679 8680 /** 8681 * Faster version of setAlpha() which performs the same steps except there are 8682 * no calls to invalidate(). The caller of this function should perform proper invalidation 8683 * on the parent and this object. The return value indicates whether the subclass handles 8684 * alpha (the return value for onSetAlpha()). 8685 * 8686 * @param alpha The new value for the alpha property 8687 * @return true if the View subclass handles alpha (the return value for onSetAlpha()) and 8688 * the new value for the alpha property is different from the old value 8689 */ 8690 boolean setAlphaNoInvalidation(float alpha) { 8691 ensureTransformationInfo(); 8692 if (mTransformationInfo.mAlpha != alpha) { 8693 mTransformationInfo.mAlpha = alpha; 8694 boolean subclassHandlesAlpha = onSetAlpha((int) (alpha * 255)); 8695 if (subclassHandlesAlpha) { 8696 mPrivateFlags |= ALPHA_SET; 8697 return true; 8698 } else { 8699 mPrivateFlags &= ~ALPHA_SET; 8700 if (mDisplayList != null) { 8701 mDisplayList.setAlpha(alpha); 8702 } 8703 } 8704 } 8705 return false; 8706 } 8707 8708 /** 8709 * Top position of this view relative to its parent. 8710 * 8711 * @return The top of this view, in pixels. 8712 */ 8713 @ViewDebug.CapturedViewProperty 8714 public final int getTop() { 8715 return mTop; 8716 } 8717 8718 /** 8719 * Sets the top position of this view relative to its parent. This method is meant to be called 8720 * by the layout system and should not generally be called otherwise, because the property 8721 * may be changed at any time by the layout. 8722 * 8723 * @param top The top of this view, in pixels. 8724 */ 8725 public final void setTop(int top) { 8726 if (top != mTop) { 8727 updateMatrix(); 8728 final boolean matrixIsIdentity = mTransformationInfo == null 8729 || mTransformationInfo.mMatrixIsIdentity; 8730 if (matrixIsIdentity) { 8731 if (mAttachInfo != null) { 8732 int minTop; 8733 int yLoc; 8734 if (top < mTop) { 8735 minTop = top; 8736 yLoc = top - mTop; 8737 } else { 8738 minTop = mTop; 8739 yLoc = 0; 8740 } 8741 invalidate(0, yLoc, mRight - mLeft, mBottom - minTop); 8742 } 8743 } else { 8744 // Double-invalidation is necessary to capture view's old and new areas 8745 invalidate(true); 8746 } 8747 8748 int width = mRight - mLeft; 8749 int oldHeight = mBottom - mTop; 8750 8751 mTop = top; 8752 if (mDisplayList != null) { 8753 mDisplayList.setTop(mTop); 8754 } 8755 8756 onSizeChanged(width, mBottom - mTop, width, oldHeight); 8757 8758 if (!matrixIsIdentity) { 8759 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8760 // A change in dimension means an auto-centered pivot point changes, too 8761 mTransformationInfo.mMatrixDirty = true; 8762 } 8763 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8764 invalidate(true); 8765 } 8766 mBackgroundSizeChanged = true; 8767 invalidateParentIfNeeded(); 8768 } 8769 } 8770 8771 /** 8772 * Bottom position of this view relative to its parent. 8773 * 8774 * @return The bottom of this view, in pixels. 8775 */ 8776 @ViewDebug.CapturedViewProperty 8777 public final int getBottom() { 8778 return mBottom; 8779 } 8780 8781 /** 8782 * True if this view has changed since the last time being drawn. 8783 * 8784 * @return The dirty state of this view. 8785 */ 8786 public boolean isDirty() { 8787 return (mPrivateFlags & DIRTY_MASK) != 0; 8788 } 8789 8790 /** 8791 * Sets the bottom position of this view relative to its parent. This method is meant to be 8792 * called by the layout system and should not generally be called otherwise, because the 8793 * property may be changed at any time by the layout. 8794 * 8795 * @param bottom The bottom of this view, in pixels. 8796 */ 8797 public final void setBottom(int bottom) { 8798 if (bottom != mBottom) { 8799 updateMatrix(); 8800 final boolean matrixIsIdentity = mTransformationInfo == null 8801 || mTransformationInfo.mMatrixIsIdentity; 8802 if (matrixIsIdentity) { 8803 if (mAttachInfo != null) { 8804 int maxBottom; 8805 if (bottom < mBottom) { 8806 maxBottom = mBottom; 8807 } else { 8808 maxBottom = bottom; 8809 } 8810 invalidate(0, 0, mRight - mLeft, maxBottom - mTop); 8811 } 8812 } else { 8813 // Double-invalidation is necessary to capture view's old and new areas 8814 invalidate(true); 8815 } 8816 8817 int width = mRight - mLeft; 8818 int oldHeight = mBottom - mTop; 8819 8820 mBottom = bottom; 8821 if (mDisplayList != null) { 8822 mDisplayList.setBottom(mBottom); 8823 } 8824 8825 onSizeChanged(width, mBottom - mTop, width, oldHeight); 8826 8827 if (!matrixIsIdentity) { 8828 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8829 // A change in dimension means an auto-centered pivot point changes, too 8830 mTransformationInfo.mMatrixDirty = true; 8831 } 8832 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8833 invalidate(true); 8834 } 8835 mBackgroundSizeChanged = true; 8836 invalidateParentIfNeeded(); 8837 } 8838 } 8839 8840 /** 8841 * Left position of this view relative to its parent. 8842 * 8843 * @return The left edge of this view, in pixels. 8844 */ 8845 @ViewDebug.CapturedViewProperty 8846 public final int getLeft() { 8847 return mLeft; 8848 } 8849 8850 /** 8851 * Sets the left position of this view relative to its parent. This method is meant to be called 8852 * by the layout system and should not generally be called otherwise, because the property 8853 * may be changed at any time by the layout. 8854 * 8855 * @param left The bottom of this view, in pixels. 8856 */ 8857 public final void setLeft(int left) { 8858 if (left != mLeft) { 8859 updateMatrix(); 8860 final boolean matrixIsIdentity = mTransformationInfo == null 8861 || mTransformationInfo.mMatrixIsIdentity; 8862 if (matrixIsIdentity) { 8863 if (mAttachInfo != null) { 8864 int minLeft; 8865 int xLoc; 8866 if (left < mLeft) { 8867 minLeft = left; 8868 xLoc = left - mLeft; 8869 } else { 8870 minLeft = mLeft; 8871 xLoc = 0; 8872 } 8873 invalidate(xLoc, 0, mRight - minLeft, mBottom - mTop); 8874 } 8875 } else { 8876 // Double-invalidation is necessary to capture view's old and new areas 8877 invalidate(true); 8878 } 8879 8880 int oldWidth = mRight - mLeft; 8881 int height = mBottom - mTop; 8882 8883 mLeft = left; 8884 if (mDisplayList != null) { 8885 mDisplayList.setLeft(left); 8886 } 8887 8888 onSizeChanged(mRight - mLeft, height, oldWidth, height); 8889 8890 if (!matrixIsIdentity) { 8891 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8892 // A change in dimension means an auto-centered pivot point changes, too 8893 mTransformationInfo.mMatrixDirty = true; 8894 } 8895 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8896 invalidate(true); 8897 } 8898 mBackgroundSizeChanged = true; 8899 invalidateParentIfNeeded(); 8900 } 8901 } 8902 8903 /** 8904 * Right position of this view relative to its parent. 8905 * 8906 * @return The right edge of this view, in pixels. 8907 */ 8908 @ViewDebug.CapturedViewProperty 8909 public final int getRight() { 8910 return mRight; 8911 } 8912 8913 /** 8914 * Sets the right position of this view relative to its parent. This method is meant to be called 8915 * by the layout system and should not generally be called otherwise, because the property 8916 * may be changed at any time by the layout. 8917 * 8918 * @param right The bottom of this view, in pixels. 8919 */ 8920 public final void setRight(int right) { 8921 if (right != mRight) { 8922 updateMatrix(); 8923 final boolean matrixIsIdentity = mTransformationInfo == null 8924 || mTransformationInfo.mMatrixIsIdentity; 8925 if (matrixIsIdentity) { 8926 if (mAttachInfo != null) { 8927 int maxRight; 8928 if (right < mRight) { 8929 maxRight = mRight; 8930 } else { 8931 maxRight = right; 8932 } 8933 invalidate(0, 0, maxRight - mLeft, mBottom - mTop); 8934 } 8935 } else { 8936 // Double-invalidation is necessary to capture view's old and new areas 8937 invalidate(true); 8938 } 8939 8940 int oldWidth = mRight - mLeft; 8941 int height = mBottom - mTop; 8942 8943 mRight = right; 8944 if (mDisplayList != null) { 8945 mDisplayList.setRight(mRight); 8946 } 8947 8948 onSizeChanged(mRight - mLeft, height, oldWidth, height); 8949 8950 if (!matrixIsIdentity) { 8951 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8952 // A change in dimension means an auto-centered pivot point changes, too 8953 mTransformationInfo.mMatrixDirty = true; 8954 } 8955 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 8956 invalidate(true); 8957 } 8958 mBackgroundSizeChanged = true; 8959 invalidateParentIfNeeded(); 8960 } 8961 } 8962 8963 /** 8964 * The visual x position of this view, in pixels. This is equivalent to the 8965 * {@link #setTranslationX(float) translationX} property plus the current 8966 * {@link #getLeft() left} property. 8967 * 8968 * @return The visual x position of this view, in pixels. 8969 */ 8970 @ViewDebug.ExportedProperty(category = "drawing") 8971 public float getX() { 8972 return mLeft + (mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0); 8973 } 8974 8975 /** 8976 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 8977 * {@link #setTranslationX(float) translationX} property to be the difference between 8978 * the x value passed in and the current {@link #getLeft() left} property. 8979 * 8980 * @param x The visual x position of this view, in pixels. 8981 */ 8982 public void setX(float x) { 8983 setTranslationX(x - mLeft); 8984 } 8985 8986 /** 8987 * The visual y position of this view, in pixels. This is equivalent to the 8988 * {@link #setTranslationY(float) translationY} property plus the current 8989 * {@link #getTop() top} property. 8990 * 8991 * @return The visual y position of this view, in pixels. 8992 */ 8993 @ViewDebug.ExportedProperty(category = "drawing") 8994 public float getY() { 8995 return mTop + (mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0); 8996 } 8997 8998 /** 8999 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 9000 * {@link #setTranslationY(float) translationY} property to be the difference between 9001 * the y value passed in and the current {@link #getTop() top} property. 9002 * 9003 * @param y The visual y position of this view, in pixels. 9004 */ 9005 public void setY(float y) { 9006 setTranslationY(y - mTop); 9007 } 9008 9009 9010 /** 9011 * The horizontal location of this view relative to its {@link #getLeft() left} position. 9012 * This position is post-layout, in addition to wherever the object's 9013 * layout placed it. 9014 * 9015 * @return The horizontal position of this view relative to its left position, in pixels. 9016 */ 9017 @ViewDebug.ExportedProperty(category = "drawing") 9018 public float getTranslationX() { 9019 return mTransformationInfo != null ? mTransformationInfo.mTranslationX : 0; 9020 } 9021 9022 /** 9023 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 9024 * This effectively positions the object post-layout, in addition to wherever the object's 9025 * layout placed it. 9026 * 9027 * @param translationX The horizontal position of this view relative to its left position, 9028 * in pixels. 9029 * 9030 * @attr ref android.R.styleable#View_translationX 9031 */ 9032 public void setTranslationX(float translationX) { 9033 ensureTransformationInfo(); 9034 final TransformationInfo info = mTransformationInfo; 9035 if (info.mTranslationX != translationX) { 9036 // Double-invalidation is necessary to capture view's old and new areas 9037 invalidateViewProperty(true, false); 9038 info.mTranslationX = translationX; 9039 info.mMatrixDirty = true; 9040 invalidateViewProperty(false, true); 9041 if (mDisplayList != null) { 9042 mDisplayList.setTranslationX(translationX); 9043 } 9044 } 9045 } 9046 9047 /** 9048 * The horizontal location of this view relative to its {@link #getTop() top} position. 9049 * This position is post-layout, in addition to wherever the object's 9050 * layout placed it. 9051 * 9052 * @return The vertical position of this view relative to its top position, 9053 * in pixels. 9054 */ 9055 @ViewDebug.ExportedProperty(category = "drawing") 9056 public float getTranslationY() { 9057 return mTransformationInfo != null ? mTransformationInfo.mTranslationY : 0; 9058 } 9059 9060 /** 9061 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 9062 * This effectively positions the object post-layout, in addition to wherever the object's 9063 * layout placed it. 9064 * 9065 * @param translationY The vertical position of this view relative to its top position, 9066 * in pixels. 9067 * 9068 * @attr ref android.R.styleable#View_translationY 9069 */ 9070 public void setTranslationY(float translationY) { 9071 ensureTransformationInfo(); 9072 final TransformationInfo info = mTransformationInfo; 9073 if (info.mTranslationY != translationY) { 9074 invalidateViewProperty(true, false); 9075 info.mTranslationY = translationY; 9076 info.mMatrixDirty = true; 9077 invalidateViewProperty(false, true); 9078 if (mDisplayList != null) { 9079 mDisplayList.setTranslationY(translationY); 9080 } 9081 } 9082 } 9083 9084 /** 9085 * Hit rectangle in parent's coordinates 9086 * 9087 * @param outRect The hit rectangle of the view. 9088 */ 9089 public void getHitRect(Rect outRect) { 9090 updateMatrix(); 9091 final TransformationInfo info = mTransformationInfo; 9092 if (info == null || info.mMatrixIsIdentity || mAttachInfo == null) { 9093 outRect.set(mLeft, mTop, mRight, mBottom); 9094 } else { 9095 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 9096 tmpRect.set(-info.mPivotX, -info.mPivotY, 9097 getWidth() - info.mPivotX, getHeight() - info.mPivotY); 9098 info.mMatrix.mapRect(tmpRect); 9099 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 9100 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 9101 } 9102 } 9103 9104 /** 9105 * Determines whether the given point, in local coordinates is inside the view. 9106 */ 9107 /*package*/ final boolean pointInView(float localX, float localY) { 9108 return localX >= 0 && localX < (mRight - mLeft) 9109 && localY >= 0 && localY < (mBottom - mTop); 9110 } 9111 9112 /** 9113 * Utility method to determine whether the given point, in local coordinates, 9114 * is inside the view, where the area of the view is expanded by the slop factor. 9115 * This method is called while processing touch-move events to determine if the event 9116 * is still within the view. 9117 */ 9118 private boolean pointInView(float localX, float localY, float slop) { 9119 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 9120 localY < ((mBottom - mTop) + slop); 9121 } 9122 9123 /** 9124 * When a view has focus and the user navigates away from it, the next view is searched for 9125 * starting from the rectangle filled in by this method. 9126 * 9127 * By default, the rectange is the {@link #getDrawingRect(android.graphics.Rect)}) 9128 * of the view. However, if your view maintains some idea of internal selection, 9129 * such as a cursor, or a selected row or column, you should override this method and 9130 * fill in a more specific rectangle. 9131 * 9132 * @param r The rectangle to fill in, in this view's coordinates. 9133 */ 9134 public void getFocusedRect(Rect r) { 9135 getDrawingRect(r); 9136 } 9137 9138 /** 9139 * If some part of this view is not clipped by any of its parents, then 9140 * return that area in r in global (root) coordinates. To convert r to local 9141 * coordinates (without taking possible View rotations into account), offset 9142 * it by -globalOffset (e.g. r.offset(-globalOffset.x, -globalOffset.y)). 9143 * If the view is completely clipped or translated out, return false. 9144 * 9145 * @param r If true is returned, r holds the global coordinates of the 9146 * visible portion of this view. 9147 * @param globalOffset If true is returned, globalOffset holds the dx,dy 9148 * between this view and its root. globalOffet may be null. 9149 * @return true if r is non-empty (i.e. part of the view is visible at the 9150 * root level. 9151 */ 9152 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 9153 int width = mRight - mLeft; 9154 int height = mBottom - mTop; 9155 if (width > 0 && height > 0) { 9156 r.set(0, 0, width, height); 9157 if (globalOffset != null) { 9158 globalOffset.set(-mScrollX, -mScrollY); 9159 } 9160 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 9161 } 9162 return false; 9163 } 9164 9165 public final boolean getGlobalVisibleRect(Rect r) { 9166 return getGlobalVisibleRect(r, null); 9167 } 9168 9169 public final boolean getLocalVisibleRect(Rect r) { 9170 Point offset = new Point(); 9171 if (getGlobalVisibleRect(r, offset)) { 9172 r.offset(-offset.x, -offset.y); // make r local 9173 return true; 9174 } 9175 return false; 9176 } 9177 9178 /** 9179 * Offset this view's vertical location by the specified number of pixels. 9180 * 9181 * @param offset the number of pixels to offset the view by 9182 */ 9183 public void offsetTopAndBottom(int offset) { 9184 if (offset != 0) { 9185 updateMatrix(); 9186 final boolean matrixIsIdentity = mTransformationInfo == null 9187 || mTransformationInfo.mMatrixIsIdentity; 9188 if (matrixIsIdentity) { 9189 if (mDisplayList != null) { 9190 invalidateViewProperty(false, false); 9191 } else { 9192 final ViewParent p = mParent; 9193 if (p != null && mAttachInfo != null) { 9194 final Rect r = mAttachInfo.mTmpInvalRect; 9195 int minTop; 9196 int maxBottom; 9197 int yLoc; 9198 if (offset < 0) { 9199 minTop = mTop + offset; 9200 maxBottom = mBottom; 9201 yLoc = offset; 9202 } else { 9203 minTop = mTop; 9204 maxBottom = mBottom + offset; 9205 yLoc = 0; 9206 } 9207 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 9208 p.invalidateChild(this, r); 9209 } 9210 } 9211 } else { 9212 invalidateViewProperty(false, false); 9213 } 9214 9215 mTop += offset; 9216 mBottom += offset; 9217 if (mDisplayList != null) { 9218 mDisplayList.offsetTopBottom(offset); 9219 invalidateViewProperty(false, false); 9220 } else { 9221 if (!matrixIsIdentity) { 9222 invalidateViewProperty(false, true); 9223 } 9224 invalidateParentIfNeeded(); 9225 } 9226 } 9227 } 9228 9229 /** 9230 * Offset this view's horizontal location by the specified amount of pixels. 9231 * 9232 * @param offset the numer of pixels to offset the view by 9233 */ 9234 public void offsetLeftAndRight(int offset) { 9235 if (offset != 0) { 9236 updateMatrix(); 9237 final boolean matrixIsIdentity = mTransformationInfo == null 9238 || mTransformationInfo.mMatrixIsIdentity; 9239 if (matrixIsIdentity) { 9240 if (mDisplayList != null) { 9241 invalidateViewProperty(false, false); 9242 } else { 9243 final ViewParent p = mParent; 9244 if (p != null && mAttachInfo != null) { 9245 final Rect r = mAttachInfo.mTmpInvalRect; 9246 int minLeft; 9247 int maxRight; 9248 if (offset < 0) { 9249 minLeft = mLeft + offset; 9250 maxRight = mRight; 9251 } else { 9252 minLeft = mLeft; 9253 maxRight = mRight + offset; 9254 } 9255 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 9256 p.invalidateChild(this, r); 9257 } 9258 } 9259 } else { 9260 invalidateViewProperty(false, false); 9261 } 9262 9263 mLeft += offset; 9264 mRight += offset; 9265 if (mDisplayList != null) { 9266 mDisplayList.offsetLeftRight(offset); 9267 invalidateViewProperty(false, false); 9268 } else { 9269 if (!matrixIsIdentity) { 9270 invalidateViewProperty(false, true); 9271 } 9272 invalidateParentIfNeeded(); 9273 } 9274 } 9275 } 9276 9277 /** 9278 * Get the LayoutParams associated with this view. All views should have 9279 * layout parameters. These supply parameters to the <i>parent</i> of this 9280 * view specifying how it should be arranged. There are many subclasses of 9281 * ViewGroup.LayoutParams, and these correspond to the different subclasses 9282 * of ViewGroup that are responsible for arranging their children. 9283 * 9284 * This method may return null if this View is not attached to a parent 9285 * ViewGroup or {@link #setLayoutParams(android.view.ViewGroup.LayoutParams)} 9286 * was not invoked successfully. When a View is attached to a parent 9287 * ViewGroup, this method must not return null. 9288 * 9289 * @return The LayoutParams associated with this view, or null if no 9290 * parameters have been set yet 9291 */ 9292 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 9293 public ViewGroup.LayoutParams getLayoutParams() { 9294 return mLayoutParams; 9295 } 9296 9297 /** 9298 * Set the layout parameters associated with this view. These supply 9299 * parameters to the <i>parent</i> of this view specifying how it should be 9300 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 9301 * correspond to the different subclasses of ViewGroup that are responsible 9302 * for arranging their children. 9303 * 9304 * @param params The layout parameters for this view, cannot be null 9305 */ 9306 public void setLayoutParams(ViewGroup.LayoutParams params) { 9307 if (params == null) { 9308 throw new NullPointerException("Layout parameters cannot be null"); 9309 } 9310 mLayoutParams = params; 9311 if (mParent instanceof ViewGroup) { 9312 ((ViewGroup) mParent).onSetLayoutParams(this, params); 9313 } 9314 requestLayout(); 9315 } 9316 9317 /** 9318 * Set the scrolled position of your view. This will cause a call to 9319 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9320 * invalidated. 9321 * @param x the x position to scroll to 9322 * @param y the y position to scroll to 9323 */ 9324 public void scrollTo(int x, int y) { 9325 if (mScrollX != x || mScrollY != y) { 9326 int oldX = mScrollX; 9327 int oldY = mScrollY; 9328 mScrollX = x; 9329 mScrollY = y; 9330 invalidateParentCaches(); 9331 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 9332 if (!awakenScrollBars()) { 9333 postInvalidateOnAnimation(); 9334 } 9335 } 9336 } 9337 9338 /** 9339 * Move the scrolled position of your view. This will cause a call to 9340 * {@link #onScrollChanged(int, int, int, int)} and the view will be 9341 * invalidated. 9342 * @param x the amount of pixels to scroll by horizontally 9343 * @param y the amount of pixels to scroll by vertically 9344 */ 9345 public void scrollBy(int x, int y) { 9346 scrollTo(mScrollX + x, mScrollY + y); 9347 } 9348 9349 /** 9350 * <p>Trigger the scrollbars to draw. When invoked this method starts an 9351 * animation to fade the scrollbars out after a default delay. If a subclass 9352 * provides animated scrolling, the start delay should equal the duration 9353 * of the scrolling animation.</p> 9354 * 9355 * <p>The animation starts only if at least one of the scrollbars is 9356 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 9357 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9358 * this method returns true, and false otherwise. If the animation is 9359 * started, this method calls {@link #invalidate()}; in that case the 9360 * caller should not call {@link #invalidate()}.</p> 9361 * 9362 * <p>This method should be invoked every time a subclass directly updates 9363 * the scroll parameters.</p> 9364 * 9365 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 9366 * and {@link #scrollTo(int, int)}.</p> 9367 * 9368 * @return true if the animation is played, false otherwise 9369 * 9370 * @see #awakenScrollBars(int) 9371 * @see #scrollBy(int, int) 9372 * @see #scrollTo(int, int) 9373 * @see #isHorizontalScrollBarEnabled() 9374 * @see #isVerticalScrollBarEnabled() 9375 * @see #setHorizontalScrollBarEnabled(boolean) 9376 * @see #setVerticalScrollBarEnabled(boolean) 9377 */ 9378 protected boolean awakenScrollBars() { 9379 return mScrollCache != null && 9380 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 9381 } 9382 9383 /** 9384 * Trigger the scrollbars to draw. 9385 * This method differs from awakenScrollBars() only in its default duration. 9386 * initialAwakenScrollBars() will show the scroll bars for longer than 9387 * usual to give the user more of a chance to notice them. 9388 * 9389 * @return true if the animation is played, false otherwise. 9390 */ 9391 private boolean initialAwakenScrollBars() { 9392 return mScrollCache != null && 9393 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 9394 } 9395 9396 /** 9397 * <p> 9398 * Trigger the scrollbars to draw. When invoked this method starts an 9399 * animation to fade the scrollbars out after a fixed delay. If a subclass 9400 * provides animated scrolling, the start delay should equal the duration of 9401 * the scrolling animation. 9402 * </p> 9403 * 9404 * <p> 9405 * The animation starts only if at least one of the scrollbars is enabled, 9406 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9407 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9408 * this method returns true, and false otherwise. If the animation is 9409 * started, this method calls {@link #invalidate()}; in that case the caller 9410 * should not call {@link #invalidate()}. 9411 * </p> 9412 * 9413 * <p> 9414 * This method should be invoked everytime a subclass directly updates the 9415 * scroll parameters. 9416 * </p> 9417 * 9418 * @param startDelay the delay, in milliseconds, after which the animation 9419 * should start; when the delay is 0, the animation starts 9420 * immediately 9421 * @return true if the animation is played, false otherwise 9422 * 9423 * @see #scrollBy(int, int) 9424 * @see #scrollTo(int, int) 9425 * @see #isHorizontalScrollBarEnabled() 9426 * @see #isVerticalScrollBarEnabled() 9427 * @see #setHorizontalScrollBarEnabled(boolean) 9428 * @see #setVerticalScrollBarEnabled(boolean) 9429 */ 9430 protected boolean awakenScrollBars(int startDelay) { 9431 return awakenScrollBars(startDelay, true); 9432 } 9433 9434 /** 9435 * <p> 9436 * Trigger the scrollbars to draw. When invoked this method starts an 9437 * animation to fade the scrollbars out after a fixed delay. If a subclass 9438 * provides animated scrolling, the start delay should equal the duration of 9439 * the scrolling animation. 9440 * </p> 9441 * 9442 * <p> 9443 * The animation starts only if at least one of the scrollbars is enabled, 9444 * as specified by {@link #isHorizontalScrollBarEnabled()} and 9445 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 9446 * this method returns true, and false otherwise. If the animation is 9447 * started, this method calls {@link #invalidate()} if the invalidate parameter 9448 * is set to true; in that case the caller 9449 * should not call {@link #invalidate()}. 9450 * </p> 9451 * 9452 * <p> 9453 * This method should be invoked everytime a subclass directly updates the 9454 * scroll parameters. 9455 * </p> 9456 * 9457 * @param startDelay the delay, in milliseconds, after which the animation 9458 * should start; when the delay is 0, the animation starts 9459 * immediately 9460 * 9461 * @param invalidate Wheter this method should call invalidate 9462 * 9463 * @return true if the animation is played, false otherwise 9464 * 9465 * @see #scrollBy(int, int) 9466 * @see #scrollTo(int, int) 9467 * @see #isHorizontalScrollBarEnabled() 9468 * @see #isVerticalScrollBarEnabled() 9469 * @see #setHorizontalScrollBarEnabled(boolean) 9470 * @see #setVerticalScrollBarEnabled(boolean) 9471 */ 9472 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 9473 final ScrollabilityCache scrollCache = mScrollCache; 9474 9475 if (scrollCache == null || !scrollCache.fadeScrollBars) { 9476 return false; 9477 } 9478 9479 if (scrollCache.scrollBar == null) { 9480 scrollCache.scrollBar = new ScrollBarDrawable(); 9481 } 9482 9483 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 9484 9485 if (invalidate) { 9486 // Invalidate to show the scrollbars 9487 postInvalidateOnAnimation(); 9488 } 9489 9490 if (scrollCache.state == ScrollabilityCache.OFF) { 9491 // FIXME: this is copied from WindowManagerService. 9492 // We should get this value from the system when it 9493 // is possible to do so. 9494 final int KEY_REPEAT_FIRST_DELAY = 750; 9495 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 9496 } 9497 9498 // Tell mScrollCache when we should start fading. This may 9499 // extend the fade start time if one was already scheduled 9500 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 9501 scrollCache.fadeStartTime = fadeStartTime; 9502 scrollCache.state = ScrollabilityCache.ON; 9503 9504 // Schedule our fader to run, unscheduling any old ones first 9505 if (mAttachInfo != null) { 9506 mAttachInfo.mHandler.removeCallbacks(scrollCache); 9507 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 9508 } 9509 9510 return true; 9511 } 9512 9513 return false; 9514 } 9515 9516 /** 9517 * Do not invalidate views which are not visible and which are not running an animation. They 9518 * will not get drawn and they should not set dirty flags as if they will be drawn 9519 */ 9520 private boolean skipInvalidate() { 9521 return (mViewFlags & VISIBILITY_MASK) != VISIBLE && mCurrentAnimation == null && 9522 (!(mParent instanceof ViewGroup) || 9523 !((ViewGroup) mParent).isViewTransitioning(this)); 9524 } 9525 /** 9526 * Mark the area defined by dirty as needing to be drawn. If the view is 9527 * visible, {@link #onDraw(android.graphics.Canvas)} will be called at some point 9528 * in the future. This must be called from a UI thread. To call from a non-UI 9529 * thread, call {@link #postInvalidate()}. 9530 * 9531 * WARNING: This method is destructive to dirty. 9532 * @param dirty the rectangle representing the bounds of the dirty region 9533 */ 9534 public void invalidate(Rect dirty) { 9535 if (ViewDebug.TRACE_HIERARCHY) { 9536 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9537 } 9538 9539 if (skipInvalidate()) { 9540 return; 9541 } 9542 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9543 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9544 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9545 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9546 mPrivateFlags |= INVALIDATED; 9547 mPrivateFlags |= DIRTY; 9548 final ViewParent p = mParent; 9549 final AttachInfo ai = mAttachInfo; 9550 //noinspection PointlessBooleanExpression,ConstantConditions 9551 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9552 if (p != null && ai != null && ai.mHardwareAccelerated) { 9553 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9554 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9555 p.invalidateChild(this, null); 9556 return; 9557 } 9558 } 9559 if (p != null && ai != null) { 9560 final int scrollX = mScrollX; 9561 final int scrollY = mScrollY; 9562 final Rect r = ai.mTmpInvalRect; 9563 r.set(dirty.left - scrollX, dirty.top - scrollY, 9564 dirty.right - scrollX, dirty.bottom - scrollY); 9565 mParent.invalidateChild(this, r); 9566 } 9567 } 9568 } 9569 9570 /** 9571 * Mark the area defined by the rect (l,t,r,b) as needing to be drawn. 9572 * The coordinates of the dirty rect are relative to the view. 9573 * If the view is visible, {@link #onDraw(android.graphics.Canvas)} 9574 * will be called at some point in the future. This must be called from 9575 * a UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 9576 * @param l the left position of the dirty region 9577 * @param t the top position of the dirty region 9578 * @param r the right position of the dirty region 9579 * @param b the bottom position of the dirty region 9580 */ 9581 public void invalidate(int l, int t, int r, int b) { 9582 if (ViewDebug.TRACE_HIERARCHY) { 9583 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9584 } 9585 9586 if (skipInvalidate()) { 9587 return; 9588 } 9589 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9590 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 9591 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 9592 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9593 mPrivateFlags |= INVALIDATED; 9594 mPrivateFlags |= DIRTY; 9595 final ViewParent p = mParent; 9596 final AttachInfo ai = mAttachInfo; 9597 //noinspection PointlessBooleanExpression,ConstantConditions 9598 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9599 if (p != null && ai != null && ai.mHardwareAccelerated) { 9600 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9601 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9602 p.invalidateChild(this, null); 9603 return; 9604 } 9605 } 9606 if (p != null && ai != null && l < r && t < b) { 9607 final int scrollX = mScrollX; 9608 final int scrollY = mScrollY; 9609 final Rect tmpr = ai.mTmpInvalRect; 9610 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 9611 p.invalidateChild(this, tmpr); 9612 } 9613 } 9614 } 9615 9616 /** 9617 * Invalidate the whole view. If the view is visible, 9618 * {@link #onDraw(android.graphics.Canvas)} will be called at some point in 9619 * the future. This must be called from a UI thread. To call from a non-UI thread, 9620 * call {@link #postInvalidate()}. 9621 */ 9622 public void invalidate() { 9623 invalidate(true); 9624 } 9625 9626 /** 9627 * This is where the invalidate() work actually happens. A full invalidate() 9628 * causes the drawing cache to be invalidated, but this function can be called with 9629 * invalidateCache set to false to skip that invalidation step for cases that do not 9630 * need it (for example, a component that remains at the same dimensions with the same 9631 * content). 9632 * 9633 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 9634 * well. This is usually true for a full invalidate, but may be set to false if the 9635 * View's contents or dimensions have not changed. 9636 */ 9637 void invalidate(boolean invalidateCache) { 9638 if (ViewDebug.TRACE_HIERARCHY) { 9639 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 9640 } 9641 9642 if (skipInvalidate()) { 9643 return; 9644 } 9645 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 9646 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 9647 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 9648 mLastIsOpaque = isOpaque(); 9649 mPrivateFlags &= ~DRAWN; 9650 mPrivateFlags |= DIRTY; 9651 if (invalidateCache) { 9652 mPrivateFlags |= INVALIDATED; 9653 mPrivateFlags &= ~DRAWING_CACHE_VALID; 9654 } 9655 final AttachInfo ai = mAttachInfo; 9656 final ViewParent p = mParent; 9657 //noinspection PointlessBooleanExpression,ConstantConditions 9658 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 9659 if (p != null && ai != null && ai.mHardwareAccelerated) { 9660 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 9661 // with a null dirty rect, which tells the ViewAncestor to redraw everything 9662 p.invalidateChild(this, null); 9663 return; 9664 } 9665 } 9666 9667 if (p != null && ai != null) { 9668 final Rect r = ai.mTmpInvalRect; 9669 r.set(0, 0, mRight - mLeft, mBottom - mTop); 9670 // Don't call invalidate -- we don't want to internally scroll 9671 // our own bounds 9672 p.invalidateChild(this, r); 9673 } 9674 } 9675 } 9676 9677 /** 9678 * Quick invalidation for View property changes (alpha, translationXY, etc.). We don't want to 9679 * set any flags or handle all of the cases handled by the default invalidation methods. 9680 * Instead, we just want to schedule a traversal in ViewRootImpl with the appropriate 9681 * dirty rect. This method calls into fast invalidation methods in ViewGroup that 9682 * walk up the hierarchy, transforming the dirty rect as necessary. 9683 * 9684 * The method also handles normal invalidation logic if display list properties are not 9685 * being used in this view. The invalidateParent and forceRedraw flags are used by that 9686 * backup approach, to handle these cases used in the various property-setting methods. 9687 * 9688 * @param invalidateParent Force a call to invalidateParentCaches() if display list properties 9689 * are not being used in this view 9690 * @param forceRedraw Mark the view as DRAWN to force the invalidation to propagate, if display 9691 * list properties are not being used in this view 9692 */ 9693 void invalidateViewProperty(boolean invalidateParent, boolean forceRedraw) { 9694 if (mDisplayList == null || (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { 9695 if (invalidateParent) { 9696 invalidateParentCaches(); 9697 } 9698 if (forceRedraw) { 9699 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 9700 } 9701 invalidate(false); 9702 } else { 9703 final AttachInfo ai = mAttachInfo; 9704 final ViewParent p = mParent; 9705 if (p != null && ai != null) { 9706 final Rect r = ai.mTmpInvalRect; 9707 r.set(0, 0, mRight - mLeft, mBottom - mTop); 9708 if (mParent instanceof ViewGroup) { 9709 ((ViewGroup) mParent).invalidateChildFast(this, r); 9710 } else { 9711 mParent.invalidateChild(this, r); 9712 } 9713 } 9714 } 9715 } 9716 9717 /** 9718 * Utility method to transform a given Rect by the current matrix of this view. 9719 */ 9720 void transformRect(final Rect rect) { 9721 if (!getMatrix().isIdentity()) { 9722 RectF boundingRect = mAttachInfo.mTmpTransformRect; 9723 boundingRect.set(rect); 9724 getMatrix().mapRect(boundingRect); 9725 rect.set((int) (boundingRect.left - 0.5f), 9726 (int) (boundingRect.top - 0.5f), 9727 (int) (boundingRect.right + 0.5f), 9728 (int) (boundingRect.bottom + 0.5f)); 9729 } 9730 } 9731 9732 /** 9733 * Used to indicate that the parent of this view should clear its caches. This functionality 9734 * is used to force the parent to rebuild its display list (when hardware-accelerated), 9735 * which is necessary when various parent-managed properties of the view change, such as 9736 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 9737 * clears the parent caches and does not causes an invalidate event. 9738 * 9739 * @hide 9740 */ 9741 protected void invalidateParentCaches() { 9742 if (mParent instanceof View) { 9743 ((View) mParent).mPrivateFlags |= INVALIDATED; 9744 } 9745 } 9746 9747 /** 9748 * Used to indicate that the parent of this view should be invalidated. This functionality 9749 * is used to force the parent to rebuild its display list (when hardware-accelerated), 9750 * which is necessary when various parent-managed properties of the view change, such as 9751 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 9752 * an invalidation event to the parent. 9753 * 9754 * @hide 9755 */ 9756 protected void invalidateParentIfNeeded() { 9757 if (isHardwareAccelerated() && mParent instanceof View) { 9758 ((View) mParent).invalidate(true); 9759 } 9760 } 9761 9762 /** 9763 * Indicates whether this View is opaque. An opaque View guarantees that it will 9764 * draw all the pixels overlapping its bounds using a fully opaque color. 9765 * 9766 * Subclasses of View should override this method whenever possible to indicate 9767 * whether an instance is opaque. Opaque Views are treated in a special way by 9768 * the View hierarchy, possibly allowing it to perform optimizations during 9769 * invalidate/draw passes. 9770 * 9771 * @return True if this View is guaranteed to be fully opaque, false otherwise. 9772 */ 9773 @ViewDebug.ExportedProperty(category = "drawing") 9774 public boolean isOpaque() { 9775 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 9776 ((mTransformationInfo != null ? mTransformationInfo.mAlpha : 1) 9777 >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 9778 } 9779 9780 /** 9781 * @hide 9782 */ 9783 protected void computeOpaqueFlags() { 9784 // Opaque if: 9785 // - Has a background 9786 // - Background is opaque 9787 // - Doesn't have scrollbars or scrollbars are inside overlay 9788 9789 if (mBackground != null && mBackground.getOpacity() == PixelFormat.OPAQUE) { 9790 mPrivateFlags |= OPAQUE_BACKGROUND; 9791 } else { 9792 mPrivateFlags &= ~OPAQUE_BACKGROUND; 9793 } 9794 9795 final int flags = mViewFlags; 9796 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 9797 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 9798 mPrivateFlags |= OPAQUE_SCROLLBARS; 9799 } else { 9800 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 9801 } 9802 } 9803 9804 /** 9805 * @hide 9806 */ 9807 protected boolean hasOpaqueScrollbars() { 9808 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 9809 } 9810 9811 /** 9812 * @return A handler associated with the thread running the View. This 9813 * handler can be used to pump events in the UI events queue. 9814 */ 9815 public Handler getHandler() { 9816 if (mAttachInfo != null) { 9817 return mAttachInfo.mHandler; 9818 } 9819 return null; 9820 } 9821 9822 /** 9823 * Gets the view root associated with the View. 9824 * @return The view root, or null if none. 9825 * @hide 9826 */ 9827 public ViewRootImpl getViewRootImpl() { 9828 if (mAttachInfo != null) { 9829 return mAttachInfo.mViewRootImpl; 9830 } 9831 return null; 9832 } 9833 9834 /** 9835 * <p>Causes the Runnable to be added to the message queue. 9836 * The runnable will be run on the user interface thread.</p> 9837 * 9838 * <p>This method can be invoked from outside of the UI thread 9839 * only when this View is attached to a window.</p> 9840 * 9841 * @param action The Runnable that will be executed. 9842 * 9843 * @return Returns true if the Runnable was successfully placed in to the 9844 * message queue. Returns false on failure, usually because the 9845 * looper processing the message queue is exiting. 9846 * 9847 * @see #postDelayed 9848 * @see #removeCallbacks 9849 */ 9850 public boolean post(Runnable action) { 9851 final AttachInfo attachInfo = mAttachInfo; 9852 if (attachInfo != null) { 9853 return attachInfo.mHandler.post(action); 9854 } 9855 // Assume that post will succeed later 9856 ViewRootImpl.getRunQueue().post(action); 9857 return true; 9858 } 9859 9860 /** 9861 * <p>Causes the Runnable to be added to the message queue, to be run 9862 * after the specified amount of time elapses. 9863 * The runnable will be run on the user interface thread.</p> 9864 * 9865 * <p>This method can be invoked from outside of the UI thread 9866 * only when this View is attached to a window.</p> 9867 * 9868 * @param action The Runnable that will be executed. 9869 * @param delayMillis The delay (in milliseconds) until the Runnable 9870 * will be executed. 9871 * 9872 * @return true if the Runnable was successfully placed in to the 9873 * message queue. Returns false on failure, usually because the 9874 * looper processing the message queue is exiting. Note that a 9875 * result of true does not mean the Runnable will be processed -- 9876 * if the looper is quit before the delivery time of the message 9877 * occurs then the message will be dropped. 9878 * 9879 * @see #post 9880 * @see #removeCallbacks 9881 */ 9882 public boolean postDelayed(Runnable action, long delayMillis) { 9883 final AttachInfo attachInfo = mAttachInfo; 9884 if (attachInfo != null) { 9885 return attachInfo.mHandler.postDelayed(action, delayMillis); 9886 } 9887 // Assume that post will succeed later 9888 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 9889 return true; 9890 } 9891 9892 /** 9893 * <p>Causes the Runnable to execute on the next animation time step. 9894 * The runnable will be run on the user interface thread.</p> 9895 * 9896 * <p>This method can be invoked from outside of the UI thread 9897 * only when this View is attached to a window.</p> 9898 * 9899 * @param action The Runnable that will be executed. 9900 * 9901 * @see #postOnAnimationDelayed 9902 * @see #removeCallbacks 9903 */ 9904 public void postOnAnimation(Runnable action) { 9905 final AttachInfo attachInfo = mAttachInfo; 9906 if (attachInfo != null) { 9907 attachInfo.mViewRootImpl.mChoreographer.postCallback( 9908 Choreographer.CALLBACK_ANIMATION, action, null); 9909 } else { 9910 // Assume that post will succeed later 9911 ViewRootImpl.getRunQueue().post(action); 9912 } 9913 } 9914 9915 /** 9916 * <p>Causes the Runnable to execute on the next animation time step, 9917 * after the specified amount of time elapses. 9918 * The runnable will be run on the user interface thread.</p> 9919 * 9920 * <p>This method can be invoked from outside of the UI thread 9921 * only when this View is attached to a window.</p> 9922 * 9923 * @param action The Runnable that will be executed. 9924 * @param delayMillis The delay (in milliseconds) until the Runnable 9925 * will be executed. 9926 * 9927 * @see #postOnAnimation 9928 * @see #removeCallbacks 9929 */ 9930 public void postOnAnimationDelayed(Runnable action, long delayMillis) { 9931 final AttachInfo attachInfo = mAttachInfo; 9932 if (attachInfo != null) { 9933 attachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 9934 Choreographer.CALLBACK_ANIMATION, action, null, delayMillis); 9935 } else { 9936 // Assume that post will succeed later 9937 ViewRootImpl.getRunQueue().postDelayed(action, delayMillis); 9938 } 9939 } 9940 9941 /** 9942 * <p>Removes the specified Runnable from the message queue.</p> 9943 * 9944 * <p>This method can be invoked from outside of the UI thread 9945 * only when this View is attached to a window.</p> 9946 * 9947 * @param action The Runnable to remove from the message handling queue 9948 * 9949 * @return true if this view could ask the Handler to remove the Runnable, 9950 * false otherwise. When the returned value is true, the Runnable 9951 * may or may not have been actually removed from the message queue 9952 * (for instance, if the Runnable was not in the queue already.) 9953 * 9954 * @see #post 9955 * @see #postDelayed 9956 * @see #postOnAnimation 9957 * @see #postOnAnimationDelayed 9958 */ 9959 public boolean removeCallbacks(Runnable action) { 9960 if (action != null) { 9961 final AttachInfo attachInfo = mAttachInfo; 9962 if (attachInfo != null) { 9963 attachInfo.mHandler.removeCallbacks(action); 9964 attachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 9965 Choreographer.CALLBACK_ANIMATION, action, null); 9966 } else { 9967 // Assume that post will succeed later 9968 ViewRootImpl.getRunQueue().removeCallbacks(action); 9969 } 9970 } 9971 return true; 9972 } 9973 9974 /** 9975 * <p>Cause an invalidate to happen on a subsequent cycle through the event loop. 9976 * Use this to invalidate the View from a non-UI thread.</p> 9977 * 9978 * <p>This method can be invoked from outside of the UI thread 9979 * only when this View is attached to a window.</p> 9980 * 9981 * @see #invalidate() 9982 * @see #postInvalidateDelayed(long) 9983 */ 9984 public void postInvalidate() { 9985 postInvalidateDelayed(0); 9986 } 9987 9988 /** 9989 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 9990 * through the event loop. Use this to invalidate the View from a non-UI thread.</p> 9991 * 9992 * <p>This method can be invoked from outside of the UI thread 9993 * only when this View is attached to a window.</p> 9994 * 9995 * @param left The left coordinate of the rectangle to invalidate. 9996 * @param top The top coordinate of the rectangle to invalidate. 9997 * @param right The right coordinate of the rectangle to invalidate. 9998 * @param bottom The bottom coordinate of the rectangle to invalidate. 9999 * 10000 * @see #invalidate(int, int, int, int) 10001 * @see #invalidate(Rect) 10002 * @see #postInvalidateDelayed(long, int, int, int, int) 10003 */ 10004 public void postInvalidate(int left, int top, int right, int bottom) { 10005 postInvalidateDelayed(0, left, top, right, bottom); 10006 } 10007 10008 /** 10009 * <p>Cause an invalidate to happen on a subsequent cycle through the event 10010 * loop. Waits for the specified amount of time.</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 delayMilliseconds the duration in milliseconds to delay the 10016 * invalidation by 10017 * 10018 * @see #invalidate() 10019 * @see #postInvalidate() 10020 */ 10021 public void postInvalidateDelayed(long delayMilliseconds) { 10022 // We try only with the AttachInfo because there's no point in invalidating 10023 // if we are not attached to our window 10024 final AttachInfo attachInfo = mAttachInfo; 10025 if (attachInfo != null) { 10026 attachInfo.mViewRootImpl.dispatchInvalidateDelayed(this, delayMilliseconds); 10027 } 10028 } 10029 10030 /** 10031 * <p>Cause an invalidate of the specified area to happen on a subsequent cycle 10032 * through the event loop. Waits for the specified amount of time.</p> 10033 * 10034 * <p>This method can be invoked from outside of the UI thread 10035 * only when this View is attached to a window.</p> 10036 * 10037 * @param delayMilliseconds the duration in milliseconds to delay the 10038 * invalidation by 10039 * @param left The left coordinate of the rectangle to invalidate. 10040 * @param top The top coordinate of the rectangle to invalidate. 10041 * @param right The right coordinate of the rectangle to invalidate. 10042 * @param bottom The bottom coordinate of the rectangle to invalidate. 10043 * 10044 * @see #invalidate(int, int, int, int) 10045 * @see #invalidate(Rect) 10046 * @see #postInvalidate(int, int, int, int) 10047 */ 10048 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 10049 int right, int bottom) { 10050 10051 // We try only with the AttachInfo because there's no point in invalidating 10052 // if we are not attached to our window 10053 final AttachInfo attachInfo = mAttachInfo; 10054 if (attachInfo != null) { 10055 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10056 info.target = this; 10057 info.left = left; 10058 info.top = top; 10059 info.right = right; 10060 info.bottom = bottom; 10061 10062 attachInfo.mViewRootImpl.dispatchInvalidateRectDelayed(info, delayMilliseconds); 10063 } 10064 } 10065 10066 /** 10067 * <p>Cause an invalidate to happen on the next animation time step, typically the 10068 * next display frame.</p> 10069 * 10070 * <p>This method can be invoked from outside of the UI thread 10071 * only when this View is attached to a window.</p> 10072 * 10073 * @see #invalidate() 10074 */ 10075 public void postInvalidateOnAnimation() { 10076 // We try only with the AttachInfo because there's no point in invalidating 10077 // if we are not attached to our window 10078 final AttachInfo attachInfo = mAttachInfo; 10079 if (attachInfo != null) { 10080 attachInfo.mViewRootImpl.dispatchInvalidateOnAnimation(this); 10081 } 10082 } 10083 10084 /** 10085 * <p>Cause an invalidate of the specified area to happen on the next animation 10086 * time step, typically the next display frame.</p> 10087 * 10088 * <p>This method can be invoked from outside of the UI thread 10089 * only when this View is attached to a window.</p> 10090 * 10091 * @param left The left coordinate of the rectangle to invalidate. 10092 * @param top The top coordinate of the rectangle to invalidate. 10093 * @param right The right coordinate of the rectangle to invalidate. 10094 * @param bottom The bottom coordinate of the rectangle to invalidate. 10095 * 10096 * @see #invalidate(int, int, int, int) 10097 * @see #invalidate(Rect) 10098 */ 10099 public void postInvalidateOnAnimation(int left, int top, int right, int bottom) { 10100 // We try only with the AttachInfo because there's no point in invalidating 10101 // if we are not attached to our window 10102 final AttachInfo attachInfo = mAttachInfo; 10103 if (attachInfo != null) { 10104 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 10105 info.target = this; 10106 info.left = left; 10107 info.top = top; 10108 info.right = right; 10109 info.bottom = bottom; 10110 10111 attachInfo.mViewRootImpl.dispatchInvalidateRectOnAnimation(info); 10112 } 10113 } 10114 10115 /** 10116 * Post a callback to send a {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} event. 10117 * This event is sent at most once every 10118 * {@link ViewConfiguration#getSendRecurringAccessibilityEventsInterval()}. 10119 */ 10120 private void postSendViewScrolledAccessibilityEventCallback() { 10121 if (mSendViewScrolledAccessibilityEvent == null) { 10122 mSendViewScrolledAccessibilityEvent = new SendViewScrolledAccessibilityEvent(); 10123 } 10124 if (!mSendViewScrolledAccessibilityEvent.mIsPending) { 10125 mSendViewScrolledAccessibilityEvent.mIsPending = true; 10126 postDelayed(mSendViewScrolledAccessibilityEvent, 10127 ViewConfiguration.getSendRecurringAccessibilityEventsInterval()); 10128 } 10129 } 10130 10131 /** 10132 * Called by a parent to request that a child update its values for mScrollX 10133 * and mScrollY if necessary. This will typically be done if the child is 10134 * animating a scroll using a {@link android.widget.Scroller Scroller} 10135 * object. 10136 */ 10137 public void computeScroll() { 10138 } 10139 10140 /** 10141 * <p>Indicate whether the horizontal edges are faded when the view is 10142 * scrolled horizontally.</p> 10143 * 10144 * @return true if the horizontal edges should are faded on scroll, false 10145 * otherwise 10146 * 10147 * @see #setHorizontalFadingEdgeEnabled(boolean) 10148 * 10149 * @attr ref android.R.styleable#View_requiresFadingEdge 10150 */ 10151 public boolean isHorizontalFadingEdgeEnabled() { 10152 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 10153 } 10154 10155 /** 10156 * <p>Define whether the horizontal edges should be faded when this view 10157 * is scrolled horizontally.</p> 10158 * 10159 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 10160 * be faded when the view is scrolled 10161 * horizontally 10162 * 10163 * @see #isHorizontalFadingEdgeEnabled() 10164 * 10165 * @attr ref android.R.styleable#View_requiresFadingEdge 10166 */ 10167 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 10168 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 10169 if (horizontalFadingEdgeEnabled) { 10170 initScrollCache(); 10171 } 10172 10173 mViewFlags ^= FADING_EDGE_HORIZONTAL; 10174 } 10175 } 10176 10177 /** 10178 * <p>Indicate whether the vertical edges are faded when the view is 10179 * scrolled horizontally.</p> 10180 * 10181 * @return true if the vertical edges should are faded on scroll, false 10182 * otherwise 10183 * 10184 * @see #setVerticalFadingEdgeEnabled(boolean) 10185 * 10186 * @attr ref android.R.styleable#View_requiresFadingEdge 10187 */ 10188 public boolean isVerticalFadingEdgeEnabled() { 10189 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 10190 } 10191 10192 /** 10193 * <p>Define whether the vertical edges should be faded when this view 10194 * is scrolled vertically.</p> 10195 * 10196 * @param verticalFadingEdgeEnabled true if the vertical edges should 10197 * be faded when the view is scrolled 10198 * vertically 10199 * 10200 * @see #isVerticalFadingEdgeEnabled() 10201 * 10202 * @attr ref android.R.styleable#View_requiresFadingEdge 10203 */ 10204 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 10205 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 10206 if (verticalFadingEdgeEnabled) { 10207 initScrollCache(); 10208 } 10209 10210 mViewFlags ^= FADING_EDGE_VERTICAL; 10211 } 10212 } 10213 10214 /** 10215 * Returns the strength, or intensity, of the top faded edge. The strength is 10216 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10217 * returns 0.0 or 1.0 but no value in between. 10218 * 10219 * Subclasses should override this method to provide a smoother fade transition 10220 * when scrolling occurs. 10221 * 10222 * @return the intensity of the top fade as a float between 0.0f and 1.0f 10223 */ 10224 protected float getTopFadingEdgeStrength() { 10225 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 10226 } 10227 10228 /** 10229 * Returns the strength, or intensity, of the bottom faded edge. The strength is 10230 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10231 * returns 0.0 or 1.0 but no value in between. 10232 * 10233 * Subclasses should override this method to provide a smoother fade transition 10234 * when scrolling occurs. 10235 * 10236 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 10237 */ 10238 protected float getBottomFadingEdgeStrength() { 10239 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 10240 computeVerticalScrollRange() ? 1.0f : 0.0f; 10241 } 10242 10243 /** 10244 * Returns the strength, or intensity, of the left faded edge. The strength is 10245 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10246 * returns 0.0 or 1.0 but no value in between. 10247 * 10248 * Subclasses should override this method to provide a smoother fade transition 10249 * when scrolling occurs. 10250 * 10251 * @return the intensity of the left fade as a float between 0.0f and 1.0f 10252 */ 10253 protected float getLeftFadingEdgeStrength() { 10254 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 10255 } 10256 10257 /** 10258 * Returns the strength, or intensity, of the right faded edge. The strength is 10259 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 10260 * returns 0.0 or 1.0 but no value in between. 10261 * 10262 * Subclasses should override this method to provide a smoother fade transition 10263 * when scrolling occurs. 10264 * 10265 * @return the intensity of the right fade as a float between 0.0f and 1.0f 10266 */ 10267 protected float getRightFadingEdgeStrength() { 10268 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 10269 computeHorizontalScrollRange() ? 1.0f : 0.0f; 10270 } 10271 10272 /** 10273 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 10274 * scrollbar is not drawn by default.</p> 10275 * 10276 * @return true if the horizontal scrollbar should be painted, false 10277 * otherwise 10278 * 10279 * @see #setHorizontalScrollBarEnabled(boolean) 10280 */ 10281 public boolean isHorizontalScrollBarEnabled() { 10282 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10283 } 10284 10285 /** 10286 * <p>Define whether the horizontal scrollbar should be drawn or not. The 10287 * scrollbar is not drawn by default.</p> 10288 * 10289 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 10290 * be painted 10291 * 10292 * @see #isHorizontalScrollBarEnabled() 10293 */ 10294 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 10295 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 10296 mViewFlags ^= SCROLLBARS_HORIZONTAL; 10297 computeOpaqueFlags(); 10298 resolvePadding(); 10299 } 10300 } 10301 10302 /** 10303 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 10304 * scrollbar is not drawn by default.</p> 10305 * 10306 * @return true if the vertical scrollbar should be painted, false 10307 * otherwise 10308 * 10309 * @see #setVerticalScrollBarEnabled(boolean) 10310 */ 10311 public boolean isVerticalScrollBarEnabled() { 10312 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 10313 } 10314 10315 /** 10316 * <p>Define whether the vertical scrollbar should be drawn or not. The 10317 * scrollbar is not drawn by default.</p> 10318 * 10319 * @param verticalScrollBarEnabled true if the vertical scrollbar should 10320 * be painted 10321 * 10322 * @see #isVerticalScrollBarEnabled() 10323 */ 10324 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 10325 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 10326 mViewFlags ^= SCROLLBARS_VERTICAL; 10327 computeOpaqueFlags(); 10328 resolvePadding(); 10329 } 10330 } 10331 10332 /** 10333 * @hide 10334 */ 10335 protected void recomputePadding() { 10336 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 10337 } 10338 10339 /** 10340 * Define whether scrollbars will fade when the view is not scrolling. 10341 * 10342 * @param fadeScrollbars wheter to enable fading 10343 * 10344 * @attr ref android.R.styleable#View_fadeScrollbars 10345 */ 10346 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 10347 initScrollCache(); 10348 final ScrollabilityCache scrollabilityCache = mScrollCache; 10349 scrollabilityCache.fadeScrollBars = fadeScrollbars; 10350 if (fadeScrollbars) { 10351 scrollabilityCache.state = ScrollabilityCache.OFF; 10352 } else { 10353 scrollabilityCache.state = ScrollabilityCache.ON; 10354 } 10355 } 10356 10357 /** 10358 * 10359 * Returns true if scrollbars will fade when this view is not scrolling 10360 * 10361 * @return true if scrollbar fading is enabled 10362 * 10363 * @attr ref android.R.styleable#View_fadeScrollbars 10364 */ 10365 public boolean isScrollbarFadingEnabled() { 10366 return mScrollCache != null && mScrollCache.fadeScrollBars; 10367 } 10368 10369 /** 10370 * 10371 * Returns the delay before scrollbars fade. 10372 * 10373 * @return the delay before scrollbars fade 10374 * 10375 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10376 */ 10377 public int getScrollBarDefaultDelayBeforeFade() { 10378 return mScrollCache == null ? ViewConfiguration.getScrollDefaultDelay() : 10379 mScrollCache.scrollBarDefaultDelayBeforeFade; 10380 } 10381 10382 /** 10383 * Define the delay before scrollbars fade. 10384 * 10385 * @param scrollBarDefaultDelayBeforeFade - the delay before scrollbars fade 10386 * 10387 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 10388 */ 10389 public void setScrollBarDefaultDelayBeforeFade(int scrollBarDefaultDelayBeforeFade) { 10390 getScrollCache().scrollBarDefaultDelayBeforeFade = scrollBarDefaultDelayBeforeFade; 10391 } 10392 10393 /** 10394 * 10395 * Returns the scrollbar fade duration. 10396 * 10397 * @return the scrollbar fade duration 10398 * 10399 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10400 */ 10401 public int getScrollBarFadeDuration() { 10402 return mScrollCache == null ? ViewConfiguration.getScrollBarFadeDuration() : 10403 mScrollCache.scrollBarFadeDuration; 10404 } 10405 10406 /** 10407 * Define the scrollbar fade duration. 10408 * 10409 * @param scrollBarFadeDuration - the scrollbar fade duration 10410 * 10411 * @attr ref android.R.styleable#View_scrollbarFadeDuration 10412 */ 10413 public void setScrollBarFadeDuration(int scrollBarFadeDuration) { 10414 getScrollCache().scrollBarFadeDuration = scrollBarFadeDuration; 10415 } 10416 10417 /** 10418 * 10419 * Returns the scrollbar size. 10420 * 10421 * @return the scrollbar size 10422 * 10423 * @attr ref android.R.styleable#View_scrollbarSize 10424 */ 10425 public int getScrollBarSize() { 10426 return mScrollCache == null ? ViewConfiguration.get(mContext).getScaledScrollBarSize() : 10427 mScrollCache.scrollBarSize; 10428 } 10429 10430 /** 10431 * Define the scrollbar size. 10432 * 10433 * @param scrollBarSize - the scrollbar size 10434 * 10435 * @attr ref android.R.styleable#View_scrollbarSize 10436 */ 10437 public void setScrollBarSize(int scrollBarSize) { 10438 getScrollCache().scrollBarSize = scrollBarSize; 10439 } 10440 10441 /** 10442 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 10443 * inset. When inset, they add to the padding of the view. And the scrollbars 10444 * can be drawn inside the padding area or on the edge of the view. For example, 10445 * if a view has a background drawable and you want to draw the scrollbars 10446 * inside the padding specified by the drawable, you can use 10447 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 10448 * appear at the edge of the view, ignoring the padding, then you can use 10449 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 10450 * @param style the style of the scrollbars. Should be one of 10451 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 10452 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 10453 * @see #SCROLLBARS_INSIDE_OVERLAY 10454 * @see #SCROLLBARS_INSIDE_INSET 10455 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10456 * @see #SCROLLBARS_OUTSIDE_INSET 10457 * 10458 * @attr ref android.R.styleable#View_scrollbarStyle 10459 */ 10460 public void setScrollBarStyle(int style) { 10461 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 10462 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 10463 computeOpaqueFlags(); 10464 resolvePadding(); 10465 } 10466 } 10467 10468 /** 10469 * <p>Returns the current scrollbar style.</p> 10470 * @return the current scrollbar style 10471 * @see #SCROLLBARS_INSIDE_OVERLAY 10472 * @see #SCROLLBARS_INSIDE_INSET 10473 * @see #SCROLLBARS_OUTSIDE_OVERLAY 10474 * @see #SCROLLBARS_OUTSIDE_INSET 10475 * 10476 * @attr ref android.R.styleable#View_scrollbarStyle 10477 */ 10478 @ViewDebug.ExportedProperty(mapping = { 10479 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_OVERLAY, to = "INSIDE_OVERLAY"), 10480 @ViewDebug.IntToString(from = SCROLLBARS_INSIDE_INSET, to = "INSIDE_INSET"), 10481 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_OVERLAY, to = "OUTSIDE_OVERLAY"), 10482 @ViewDebug.IntToString(from = SCROLLBARS_OUTSIDE_INSET, to = "OUTSIDE_INSET") 10483 }) 10484 public int getScrollBarStyle() { 10485 return mViewFlags & SCROLLBARS_STYLE_MASK; 10486 } 10487 10488 /** 10489 * <p>Compute the horizontal range that the horizontal scrollbar 10490 * represents.</p> 10491 * 10492 * <p>The range is expressed in arbitrary units that must be the same as the 10493 * units used by {@link #computeHorizontalScrollExtent()} and 10494 * {@link #computeHorizontalScrollOffset()}.</p> 10495 * 10496 * <p>The default range is the drawing width of this view.</p> 10497 * 10498 * @return the total horizontal range represented by the horizontal 10499 * scrollbar 10500 * 10501 * @see #computeHorizontalScrollExtent() 10502 * @see #computeHorizontalScrollOffset() 10503 * @see android.widget.ScrollBarDrawable 10504 */ 10505 protected int computeHorizontalScrollRange() { 10506 return getWidth(); 10507 } 10508 10509 /** 10510 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 10511 * within the horizontal range. This value is used to compute the position 10512 * of the thumb within the scrollbar's track.</p> 10513 * 10514 * <p>The range is expressed in arbitrary units that must be the same as the 10515 * units used by {@link #computeHorizontalScrollRange()} and 10516 * {@link #computeHorizontalScrollExtent()}.</p> 10517 * 10518 * <p>The default offset is the scroll offset of this view.</p> 10519 * 10520 * @return the horizontal offset of the scrollbar's thumb 10521 * 10522 * @see #computeHorizontalScrollRange() 10523 * @see #computeHorizontalScrollExtent() 10524 * @see android.widget.ScrollBarDrawable 10525 */ 10526 protected int computeHorizontalScrollOffset() { 10527 return mScrollX; 10528 } 10529 10530 /** 10531 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 10532 * within the horizontal range. This value is used to compute the length 10533 * of the thumb within the scrollbar's track.</p> 10534 * 10535 * <p>The range is expressed in arbitrary units that must be the same as the 10536 * units used by {@link #computeHorizontalScrollRange()} and 10537 * {@link #computeHorizontalScrollOffset()}.</p> 10538 * 10539 * <p>The default extent is the drawing width of this view.</p> 10540 * 10541 * @return the horizontal extent of the scrollbar's thumb 10542 * 10543 * @see #computeHorizontalScrollRange() 10544 * @see #computeHorizontalScrollOffset() 10545 * @see android.widget.ScrollBarDrawable 10546 */ 10547 protected int computeHorizontalScrollExtent() { 10548 return getWidth(); 10549 } 10550 10551 /** 10552 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 10553 * 10554 * <p>The range is expressed in arbitrary units that must be the same as the 10555 * units used by {@link #computeVerticalScrollExtent()} and 10556 * {@link #computeVerticalScrollOffset()}.</p> 10557 * 10558 * @return the total vertical range represented by the vertical scrollbar 10559 * 10560 * <p>The default range is the drawing height of this view.</p> 10561 * 10562 * @see #computeVerticalScrollExtent() 10563 * @see #computeVerticalScrollOffset() 10564 * @see android.widget.ScrollBarDrawable 10565 */ 10566 protected int computeVerticalScrollRange() { 10567 return getHeight(); 10568 } 10569 10570 /** 10571 * <p>Compute the vertical offset of the vertical scrollbar's thumb 10572 * within the horizontal range. This value is used to compute the position 10573 * of the thumb within the scrollbar's track.</p> 10574 * 10575 * <p>The range is expressed in arbitrary units that must be the same as the 10576 * units used by {@link #computeVerticalScrollRange()} and 10577 * {@link #computeVerticalScrollExtent()}.</p> 10578 * 10579 * <p>The default offset is the scroll offset of this view.</p> 10580 * 10581 * @return the vertical offset of the scrollbar's thumb 10582 * 10583 * @see #computeVerticalScrollRange() 10584 * @see #computeVerticalScrollExtent() 10585 * @see android.widget.ScrollBarDrawable 10586 */ 10587 protected int computeVerticalScrollOffset() { 10588 return mScrollY; 10589 } 10590 10591 /** 10592 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 10593 * within the vertical range. This value is used to compute the length 10594 * of the thumb within the scrollbar's track.</p> 10595 * 10596 * <p>The range is expressed in arbitrary units that must be the same as the 10597 * units used by {@link #computeVerticalScrollRange()} and 10598 * {@link #computeVerticalScrollOffset()}.</p> 10599 * 10600 * <p>The default extent is the drawing height of this view.</p> 10601 * 10602 * @return the vertical extent of the scrollbar's thumb 10603 * 10604 * @see #computeVerticalScrollRange() 10605 * @see #computeVerticalScrollOffset() 10606 * @see android.widget.ScrollBarDrawable 10607 */ 10608 protected int computeVerticalScrollExtent() { 10609 return getHeight(); 10610 } 10611 10612 /** 10613 * Check if this view can be scrolled horizontally in a certain direction. 10614 * 10615 * @param direction Negative to check scrolling left, positive to check scrolling right. 10616 * @return true if this view can be scrolled in the specified direction, false otherwise. 10617 */ 10618 public boolean canScrollHorizontally(int direction) { 10619 final int offset = computeHorizontalScrollOffset(); 10620 final int range = computeHorizontalScrollRange() - computeHorizontalScrollExtent(); 10621 if (range == 0) return false; 10622 if (direction < 0) { 10623 return offset > 0; 10624 } else { 10625 return offset < range - 1; 10626 } 10627 } 10628 10629 /** 10630 * Check if this view can be scrolled vertically in a certain direction. 10631 * 10632 * @param direction Negative to check scrolling up, positive to check scrolling down. 10633 * @return true if this view can be scrolled in the specified direction, false otherwise. 10634 */ 10635 public boolean canScrollVertically(int direction) { 10636 final int offset = computeVerticalScrollOffset(); 10637 final int range = computeVerticalScrollRange() - computeVerticalScrollExtent(); 10638 if (range == 0) return false; 10639 if (direction < 0) { 10640 return offset > 0; 10641 } else { 10642 return offset < range - 1; 10643 } 10644 } 10645 10646 /** 10647 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 10648 * scrollbars are painted only if they have been awakened first.</p> 10649 * 10650 * @param canvas the canvas on which to draw the scrollbars 10651 * 10652 * @see #awakenScrollBars(int) 10653 */ 10654 protected final void onDrawScrollBars(Canvas canvas) { 10655 // scrollbars are drawn only when the animation is running 10656 final ScrollabilityCache cache = mScrollCache; 10657 if (cache != null) { 10658 10659 int state = cache.state; 10660 10661 if (state == ScrollabilityCache.OFF) { 10662 return; 10663 } 10664 10665 boolean invalidate = false; 10666 10667 if (state == ScrollabilityCache.FADING) { 10668 // We're fading -- get our fade interpolation 10669 if (cache.interpolatorValues == null) { 10670 cache.interpolatorValues = new float[1]; 10671 } 10672 10673 float[] values = cache.interpolatorValues; 10674 10675 // Stops the animation if we're done 10676 if (cache.scrollBarInterpolator.timeToValues(values) == 10677 Interpolator.Result.FREEZE_END) { 10678 cache.state = ScrollabilityCache.OFF; 10679 } else { 10680 cache.scrollBar.setAlpha(Math.round(values[0])); 10681 } 10682 10683 // This will make the scroll bars inval themselves after 10684 // drawing. We only want this when we're fading so that 10685 // we prevent excessive redraws 10686 invalidate = true; 10687 } else { 10688 // We're just on -- but we may have been fading before so 10689 // reset alpha 10690 cache.scrollBar.setAlpha(255); 10691 } 10692 10693 10694 final int viewFlags = mViewFlags; 10695 10696 final boolean drawHorizontalScrollBar = 10697 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 10698 final boolean drawVerticalScrollBar = 10699 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 10700 && !isVerticalScrollBarHidden(); 10701 10702 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 10703 final int width = mRight - mLeft; 10704 final int height = mBottom - mTop; 10705 10706 final ScrollBarDrawable scrollBar = cache.scrollBar; 10707 10708 final int scrollX = mScrollX; 10709 final int scrollY = mScrollY; 10710 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 10711 10712 int left, top, right, bottom; 10713 10714 if (drawHorizontalScrollBar) { 10715 int size = scrollBar.getSize(false); 10716 if (size <= 0) { 10717 size = cache.scrollBarSize; 10718 } 10719 10720 scrollBar.setParameters(computeHorizontalScrollRange(), 10721 computeHorizontalScrollOffset(), 10722 computeHorizontalScrollExtent(), false); 10723 final int verticalScrollBarGap = drawVerticalScrollBar ? 10724 getVerticalScrollbarWidth() : 0; 10725 top = scrollY + height - size - (mUserPaddingBottom & inside); 10726 left = scrollX + (mPaddingLeft & inside); 10727 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 10728 bottom = top + size; 10729 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 10730 if (invalidate) { 10731 invalidate(left, top, right, bottom); 10732 } 10733 } 10734 10735 if (drawVerticalScrollBar) { 10736 int size = scrollBar.getSize(true); 10737 if (size <= 0) { 10738 size = cache.scrollBarSize; 10739 } 10740 10741 scrollBar.setParameters(computeVerticalScrollRange(), 10742 computeVerticalScrollOffset(), 10743 computeVerticalScrollExtent(), true); 10744 switch (mVerticalScrollbarPosition) { 10745 default: 10746 case SCROLLBAR_POSITION_DEFAULT: 10747 case SCROLLBAR_POSITION_RIGHT: 10748 left = scrollX + width - size - (mUserPaddingRight & inside); 10749 break; 10750 case SCROLLBAR_POSITION_LEFT: 10751 left = scrollX + (mUserPaddingLeft & inside); 10752 break; 10753 } 10754 top = scrollY + (mPaddingTop & inside); 10755 right = left + size; 10756 bottom = scrollY + height - (mUserPaddingBottom & inside); 10757 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 10758 if (invalidate) { 10759 invalidate(left, top, right, bottom); 10760 } 10761 } 10762 } 10763 } 10764 } 10765 10766 /** 10767 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 10768 * FastScroller is visible. 10769 * @return whether to temporarily hide the vertical scrollbar 10770 * @hide 10771 */ 10772 protected boolean isVerticalScrollBarHidden() { 10773 return false; 10774 } 10775 10776 /** 10777 * <p>Draw the horizontal scrollbar if 10778 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 10779 * 10780 * @param canvas the canvas on which to draw the scrollbar 10781 * @param scrollBar the scrollbar's drawable 10782 * 10783 * @see #isHorizontalScrollBarEnabled() 10784 * @see #computeHorizontalScrollRange() 10785 * @see #computeHorizontalScrollExtent() 10786 * @see #computeHorizontalScrollOffset() 10787 * @see android.widget.ScrollBarDrawable 10788 * @hide 10789 */ 10790 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 10791 int l, int t, int r, int b) { 10792 scrollBar.setBounds(l, t, r, b); 10793 scrollBar.draw(canvas); 10794 } 10795 10796 /** 10797 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 10798 * 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 #isVerticalScrollBarEnabled() 10804 * @see #computeVerticalScrollRange() 10805 * @see #computeVerticalScrollExtent() 10806 * @see #computeVerticalScrollOffset() 10807 * @see android.widget.ScrollBarDrawable 10808 * @hide 10809 */ 10810 protected void onDrawVerticalScrollBar(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 * Implement this to do your drawing. 10818 * 10819 * @param canvas the canvas on which the background will be drawn 10820 */ 10821 protected void onDraw(Canvas canvas) { 10822 } 10823 10824 /* 10825 * Caller is responsible for calling requestLayout if necessary. 10826 * (This allows addViewInLayout to not request a new layout.) 10827 */ 10828 void assignParent(ViewParent parent) { 10829 if (mParent == null) { 10830 mParent = parent; 10831 } else if (parent == null) { 10832 mParent = null; 10833 } else { 10834 throw new RuntimeException("view " + this + " being added, but" 10835 + " it already has a parent"); 10836 } 10837 } 10838 10839 /** 10840 * This is called when the view is attached to a window. At this point it 10841 * has a Surface and will start drawing. Note that this function is 10842 * guaranteed to be called before {@link #onDraw(android.graphics.Canvas)}, 10843 * however it may be called any time before the first onDraw -- including 10844 * before or after {@link #onMeasure(int, int)}. 10845 * 10846 * @see #onDetachedFromWindow() 10847 */ 10848 protected void onAttachedToWindow() { 10849 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 10850 mParent.requestTransparentRegion(this); 10851 } 10852 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 10853 initialAwakenScrollBars(); 10854 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 10855 } 10856 jumpDrawablesToCurrentState(); 10857 // Order is important here: LayoutDirection MUST be resolved before Padding 10858 // and TextDirection 10859 resolveLayoutDirection(); 10860 resolvePadding(); 10861 resolveTextDirection(); 10862 resolveTextAlignment(); 10863 clearAccessibilityFocus(); 10864 if (isFocused()) { 10865 InputMethodManager imm = InputMethodManager.peekInstance(); 10866 imm.focusIn(this); 10867 } 10868 } 10869 10870 /** 10871 * @see #onScreenStateChanged(int) 10872 */ 10873 void dispatchScreenStateChanged(int screenState) { 10874 onScreenStateChanged(screenState); 10875 } 10876 10877 /** 10878 * This method is called whenever the state of the screen this view is 10879 * attached to changes. A state change will usually occurs when the screen 10880 * turns on or off (whether it happens automatically or the user does it 10881 * manually.) 10882 * 10883 * @param screenState The new state of the screen. Can be either 10884 * {@link #SCREEN_STATE_ON} or {@link #SCREEN_STATE_OFF} 10885 */ 10886 public void onScreenStateChanged(int screenState) { 10887 } 10888 10889 /** 10890 * Return true if the application tag in the AndroidManifest has set "supportRtl" to true 10891 */ 10892 private boolean hasRtlSupport() { 10893 return mContext.getApplicationInfo().hasRtlSupport(); 10894 } 10895 10896 /** 10897 * Resolve and cache the layout direction. LTR is set initially. This is implicitly supposing 10898 * that the parent directionality can and will be resolved before its children. 10899 * Will call {@link View#onResolvedLayoutDirectionChanged} when resolution is done. 10900 */ 10901 public void resolveLayoutDirection() { 10902 // Clear any previous layout direction resolution 10903 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 10904 10905 if (hasRtlSupport()) { 10906 // Set resolved depending on layout direction 10907 switch (getLayoutDirection()) { 10908 case LAYOUT_DIRECTION_INHERIT: 10909 // If this is root view, no need to look at parent's layout dir. 10910 if (canResolveLayoutDirection()) { 10911 ViewGroup viewGroup = ((ViewGroup) mParent); 10912 10913 if (viewGroup.getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 10914 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 10915 } 10916 } else { 10917 // Nothing to do, LTR by default 10918 } 10919 break; 10920 case LAYOUT_DIRECTION_RTL: 10921 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 10922 break; 10923 case LAYOUT_DIRECTION_LOCALE: 10924 if(isLayoutDirectionRtl(Locale.getDefault())) { 10925 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED_RTL; 10926 } 10927 break; 10928 default: 10929 // Nothing to do, LTR by default 10930 } 10931 } 10932 10933 // Set to resolved 10934 mPrivateFlags2 |= LAYOUT_DIRECTION_RESOLVED; 10935 onResolvedLayoutDirectionChanged(); 10936 // Resolve padding 10937 resolvePadding(); 10938 } 10939 10940 /** 10941 * Called when layout direction has been resolved. 10942 * 10943 * The default implementation does nothing. 10944 */ 10945 public void onResolvedLayoutDirectionChanged() { 10946 } 10947 10948 /** 10949 * Resolve padding depending on layout direction. 10950 */ 10951 public void resolvePadding() { 10952 // If the user specified the absolute padding (either with android:padding or 10953 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 10954 // use the default padding or the padding from the background drawable 10955 // (stored at this point in mPadding*) 10956 int resolvedLayoutDirection = getResolvedLayoutDirection(); 10957 switch (resolvedLayoutDirection) { 10958 case LAYOUT_DIRECTION_RTL: 10959 // Start user padding override Right user padding. Otherwise, if Right user 10960 // padding is not defined, use the default Right padding. If Right user padding 10961 // is defined, just use it. 10962 if (mUserPaddingStart >= 0) { 10963 mUserPaddingRight = mUserPaddingStart; 10964 } else if (mUserPaddingRight < 0) { 10965 mUserPaddingRight = mPaddingRight; 10966 } 10967 if (mUserPaddingEnd >= 0) { 10968 mUserPaddingLeft = mUserPaddingEnd; 10969 } else if (mUserPaddingLeft < 0) { 10970 mUserPaddingLeft = mPaddingLeft; 10971 } 10972 break; 10973 case LAYOUT_DIRECTION_LTR: 10974 default: 10975 // Start user padding override Left user padding. Otherwise, if Left user 10976 // padding is not defined, use the default left padding. If Left user padding 10977 // is defined, just use it. 10978 if (mUserPaddingStart >= 0) { 10979 mUserPaddingLeft = mUserPaddingStart; 10980 } else if (mUserPaddingLeft < 0) { 10981 mUserPaddingLeft = mPaddingLeft; 10982 } 10983 if (mUserPaddingEnd >= 0) { 10984 mUserPaddingRight = mUserPaddingEnd; 10985 } else if (mUserPaddingRight < 0) { 10986 mUserPaddingRight = mPaddingRight; 10987 } 10988 } 10989 10990 mUserPaddingBottom = (mUserPaddingBottom >= 0) ? mUserPaddingBottom : mPaddingBottom; 10991 10992 if(isPaddingRelative()) { 10993 setPaddingRelative(mUserPaddingStart, mPaddingTop, mUserPaddingEnd, mUserPaddingBottom); 10994 } else { 10995 recomputePadding(); 10996 } 10997 onPaddingChanged(resolvedLayoutDirection); 10998 } 10999 11000 /** 11001 * Resolve padding depending on the layout direction. Subclasses that care about 11002 * padding resolution should override this method. The default implementation does 11003 * nothing. 11004 * 11005 * @param layoutDirection the direction of the layout 11006 * 11007 * @see {@link #LAYOUT_DIRECTION_LTR} 11008 * @see {@link #LAYOUT_DIRECTION_RTL} 11009 */ 11010 public void onPaddingChanged(int layoutDirection) { 11011 } 11012 11013 /** 11014 * Check if layout direction resolution can be done. 11015 * 11016 * @return true if layout direction resolution can be done otherwise return false. 11017 */ 11018 public boolean canResolveLayoutDirection() { 11019 switch (getLayoutDirection()) { 11020 case LAYOUT_DIRECTION_INHERIT: 11021 return (mParent != null) && (mParent instanceof ViewGroup); 11022 default: 11023 return true; 11024 } 11025 } 11026 11027 /** 11028 * Reset the resolved layout direction. Will call {@link View#onResolvedLayoutDirectionReset} 11029 * when reset is done. 11030 */ 11031 public void resetResolvedLayoutDirection() { 11032 // Reset the current resolved bits 11033 mPrivateFlags2 &= ~LAYOUT_DIRECTION_RESOLVED_MASK; 11034 onResolvedLayoutDirectionReset(); 11035 // Reset also the text direction 11036 resetResolvedTextDirection(); 11037 } 11038 11039 /** 11040 * Called during reset of resolved layout direction. 11041 * 11042 * Subclasses need to override this method to clear cached information that depends on the 11043 * resolved layout direction, or to inform child views that inherit their layout direction. 11044 * 11045 * The default implementation does nothing. 11046 */ 11047 public void onResolvedLayoutDirectionReset() { 11048 } 11049 11050 /** 11051 * Check if a Locale uses an RTL script. 11052 * 11053 * @param locale Locale to check 11054 * @return true if the Locale uses an RTL script. 11055 */ 11056 protected static boolean isLayoutDirectionRtl(Locale locale) { 11057 return (LAYOUT_DIRECTION_RTL == LocaleUtil.getLayoutDirectionFromLocale(locale)); 11058 } 11059 11060 /** 11061 * This is called when the view is detached from a window. At this point it 11062 * no longer has a surface for drawing. 11063 * 11064 * @see #onAttachedToWindow() 11065 */ 11066 protected void onDetachedFromWindow() { 11067 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 11068 11069 removeUnsetPressCallback(); 11070 removeLongPressCallback(); 11071 removePerformClickCallback(); 11072 removeSendViewScrolledAccessibilityEventCallback(); 11073 11074 destroyDrawingCache(); 11075 11076 destroyLayer(false); 11077 11078 if (mAttachInfo != null) { 11079 if (mDisplayList != null) { 11080 mAttachInfo.mViewRootImpl.invalidateDisplayList(mDisplayList); 11081 } 11082 mAttachInfo.mViewRootImpl.cancelInvalidate(this); 11083 } else { 11084 if (mDisplayList != null) { 11085 // Should never happen 11086 mDisplayList.invalidate(); 11087 } 11088 } 11089 11090 mCurrentAnimation = null; 11091 11092 resetResolvedLayoutDirection(); 11093 resetResolvedTextAlignment(); 11094 resetAccessibilityStateChanged(); 11095 clearAccessibilityFocus(); 11096 } 11097 11098 /** 11099 * @return The number of times this view has been attached to a window 11100 */ 11101 protected int getWindowAttachCount() { 11102 return mWindowAttachCount; 11103 } 11104 11105 /** 11106 * Retrieve a unique token identifying the window this view is attached to. 11107 * @return Return the window's token for use in 11108 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 11109 */ 11110 public IBinder getWindowToken() { 11111 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 11112 } 11113 11114 /** 11115 * Retrieve a unique token identifying the top-level "real" window of 11116 * the window that this view is attached to. That is, this is like 11117 * {@link #getWindowToken}, except if the window this view in is a panel 11118 * window (attached to another containing window), then the token of 11119 * the containing window is returned instead. 11120 * 11121 * @return Returns the associated window token, either 11122 * {@link #getWindowToken()} or the containing window's token. 11123 */ 11124 public IBinder getApplicationWindowToken() { 11125 AttachInfo ai = mAttachInfo; 11126 if (ai != null) { 11127 IBinder appWindowToken = ai.mPanelParentWindowToken; 11128 if (appWindowToken == null) { 11129 appWindowToken = ai.mWindowToken; 11130 } 11131 return appWindowToken; 11132 } 11133 return null; 11134 } 11135 11136 /** 11137 * Retrieve private session object this view hierarchy is using to 11138 * communicate with the window manager. 11139 * @return the session object to communicate with the window manager 11140 */ 11141 /*package*/ IWindowSession getWindowSession() { 11142 return mAttachInfo != null ? mAttachInfo.mSession : null; 11143 } 11144 11145 /** 11146 * @param info the {@link android.view.View.AttachInfo} to associated with 11147 * this view 11148 */ 11149 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 11150 //System.out.println("Attached! " + this); 11151 mAttachInfo = info; 11152 mWindowAttachCount++; 11153 // We will need to evaluate the drawable state at least once. 11154 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 11155 if (mFloatingTreeObserver != null) { 11156 info.mTreeObserver.merge(mFloatingTreeObserver); 11157 mFloatingTreeObserver = null; 11158 } 11159 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 11160 mAttachInfo.mScrollContainers.add(this); 11161 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 11162 } 11163 performCollectViewAttributes(mAttachInfo, visibility); 11164 onAttachedToWindow(); 11165 11166 ListenerInfo li = mListenerInfo; 11167 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11168 li != null ? li.mOnAttachStateChangeListeners : null; 11169 if (listeners != null && listeners.size() > 0) { 11170 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11171 // perform the dispatching. The iterator is a safe guard against listeners that 11172 // could mutate the list by calling the various add/remove methods. This prevents 11173 // the array from being modified while we iterate it. 11174 for (OnAttachStateChangeListener listener : listeners) { 11175 listener.onViewAttachedToWindow(this); 11176 } 11177 } 11178 11179 int vis = info.mWindowVisibility; 11180 if (vis != GONE) { 11181 onWindowVisibilityChanged(vis); 11182 } 11183 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 11184 // If nobody has evaluated the drawable state yet, then do it now. 11185 refreshDrawableState(); 11186 } 11187 } 11188 11189 void dispatchDetachedFromWindow() { 11190 AttachInfo info = mAttachInfo; 11191 if (info != null) { 11192 int vis = info.mWindowVisibility; 11193 if (vis != GONE) { 11194 onWindowVisibilityChanged(GONE); 11195 } 11196 } 11197 11198 onDetachedFromWindow(); 11199 11200 ListenerInfo li = mListenerInfo; 11201 final CopyOnWriteArrayList<OnAttachStateChangeListener> listeners = 11202 li != null ? li.mOnAttachStateChangeListeners : null; 11203 if (listeners != null && listeners.size() > 0) { 11204 // NOTE: because of the use of CopyOnWriteArrayList, we *must* use an iterator to 11205 // perform the dispatching. The iterator is a safe guard against listeners that 11206 // could mutate the list by calling the various add/remove methods. This prevents 11207 // the array from being modified while we iterate it. 11208 for (OnAttachStateChangeListener listener : listeners) { 11209 listener.onViewDetachedFromWindow(this); 11210 } 11211 } 11212 11213 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 11214 mAttachInfo.mScrollContainers.remove(this); 11215 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 11216 } 11217 11218 mAttachInfo = null; 11219 } 11220 11221 /** 11222 * Store this view hierarchy's frozen state into the given container. 11223 * 11224 * @param container The SparseArray in which to save the view's state. 11225 * 11226 * @see #restoreHierarchyState(android.util.SparseArray) 11227 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11228 * @see #onSaveInstanceState() 11229 */ 11230 public void saveHierarchyState(SparseArray<Parcelable> container) { 11231 dispatchSaveInstanceState(container); 11232 } 11233 11234 /** 11235 * Called by {@link #saveHierarchyState(android.util.SparseArray)} to store the state for 11236 * this view and its children. May be overridden to modify how freezing happens to a 11237 * view's children; for example, some views may want to not store state for their children. 11238 * 11239 * @param container The SparseArray in which to save the view's state. 11240 * 11241 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11242 * @see #saveHierarchyState(android.util.SparseArray) 11243 * @see #onSaveInstanceState() 11244 */ 11245 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 11246 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 11247 mPrivateFlags &= ~SAVE_STATE_CALLED; 11248 Parcelable state = onSaveInstanceState(); 11249 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11250 throw new IllegalStateException( 11251 "Derived class did not call super.onSaveInstanceState()"); 11252 } 11253 if (state != null) { 11254 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 11255 // + ": " + state); 11256 container.put(mID, state); 11257 } 11258 } 11259 } 11260 11261 /** 11262 * Hook allowing a view to generate a representation of its internal state 11263 * that can later be used to create a new instance with that same state. 11264 * This state should only contain information that is not persistent or can 11265 * not be reconstructed later. For example, you will never store your 11266 * current position on screen because that will be computed again when a 11267 * new instance of the view is placed in its view hierarchy. 11268 * <p> 11269 * Some examples of things you may store here: the current cursor position 11270 * in a text view (but usually not the text itself since that is stored in a 11271 * content provider or other persistent storage), the currently selected 11272 * item in a list view. 11273 * 11274 * @return Returns a Parcelable object containing the view's current dynamic 11275 * state, or null if there is nothing interesting to save. The 11276 * default implementation returns null. 11277 * @see #onRestoreInstanceState(android.os.Parcelable) 11278 * @see #saveHierarchyState(android.util.SparseArray) 11279 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11280 * @see #setSaveEnabled(boolean) 11281 */ 11282 protected Parcelable onSaveInstanceState() { 11283 mPrivateFlags |= SAVE_STATE_CALLED; 11284 return BaseSavedState.EMPTY_STATE; 11285 } 11286 11287 /** 11288 * Restore this view hierarchy's frozen state from the given container. 11289 * 11290 * @param container The SparseArray which holds previously frozen states. 11291 * 11292 * @see #saveHierarchyState(android.util.SparseArray) 11293 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11294 * @see #onRestoreInstanceState(android.os.Parcelable) 11295 */ 11296 public void restoreHierarchyState(SparseArray<Parcelable> container) { 11297 dispatchRestoreInstanceState(container); 11298 } 11299 11300 /** 11301 * Called by {@link #restoreHierarchyState(android.util.SparseArray)} to retrieve the 11302 * state for this view and its children. May be overridden to modify how restoring 11303 * happens to a view's children; for example, some views may want to not store state 11304 * for their children. 11305 * 11306 * @param container The SparseArray which holds previously saved state. 11307 * 11308 * @see #dispatchSaveInstanceState(android.util.SparseArray) 11309 * @see #restoreHierarchyState(android.util.SparseArray) 11310 * @see #onRestoreInstanceState(android.os.Parcelable) 11311 */ 11312 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 11313 if (mID != NO_ID) { 11314 Parcelable state = container.get(mID); 11315 if (state != null) { 11316 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 11317 // + ": " + state); 11318 mPrivateFlags &= ~SAVE_STATE_CALLED; 11319 onRestoreInstanceState(state); 11320 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 11321 throw new IllegalStateException( 11322 "Derived class did not call super.onRestoreInstanceState()"); 11323 } 11324 } 11325 } 11326 } 11327 11328 /** 11329 * Hook allowing a view to re-apply a representation of its internal state that had previously 11330 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 11331 * null state. 11332 * 11333 * @param state The frozen state that had previously been returned by 11334 * {@link #onSaveInstanceState}. 11335 * 11336 * @see #onSaveInstanceState() 11337 * @see #restoreHierarchyState(android.util.SparseArray) 11338 * @see #dispatchRestoreInstanceState(android.util.SparseArray) 11339 */ 11340 protected void onRestoreInstanceState(Parcelable state) { 11341 mPrivateFlags |= SAVE_STATE_CALLED; 11342 if (state != BaseSavedState.EMPTY_STATE && state != null) { 11343 throw new IllegalArgumentException("Wrong state class, expecting View State but " 11344 + "received " + state.getClass().toString() + " instead. This usually happens " 11345 + "when two views of different type have the same id in the same hierarchy. " 11346 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 11347 + "other views do not use the same id."); 11348 } 11349 } 11350 11351 /** 11352 * <p>Return the time at which the drawing of the view hierarchy started.</p> 11353 * 11354 * @return the drawing start time in milliseconds 11355 */ 11356 public long getDrawingTime() { 11357 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 11358 } 11359 11360 /** 11361 * <p>Enables or disables the duplication of the parent's state into this view. When 11362 * duplication is enabled, this view gets its drawable state from its parent rather 11363 * than from its own internal properties.</p> 11364 * 11365 * <p>Note: in the current implementation, setting this property to true after the 11366 * view was added to a ViewGroup might have no effect at all. This property should 11367 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 11368 * 11369 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 11370 * property is enabled, an exception will be thrown.</p> 11371 * 11372 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 11373 * parent, these states should not be affected by this method.</p> 11374 * 11375 * @param enabled True to enable duplication of the parent's drawable state, false 11376 * to disable it. 11377 * 11378 * @see #getDrawableState() 11379 * @see #isDuplicateParentStateEnabled() 11380 */ 11381 public void setDuplicateParentStateEnabled(boolean enabled) { 11382 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 11383 } 11384 11385 /** 11386 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 11387 * 11388 * @return True if this view's drawable state is duplicated from the parent, 11389 * false otherwise 11390 * 11391 * @see #getDrawableState() 11392 * @see #setDuplicateParentStateEnabled(boolean) 11393 */ 11394 public boolean isDuplicateParentStateEnabled() { 11395 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 11396 } 11397 11398 /** 11399 * <p>Specifies the type of layer backing this view. The layer can be 11400 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 11401 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 11402 * 11403 * <p>A layer is associated with an optional {@link android.graphics.Paint} 11404 * instance that controls how the layer is composed on screen. The following 11405 * properties of the paint are taken into account when composing the layer:</p> 11406 * <ul> 11407 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 11408 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 11409 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 11410 * </ul> 11411 * 11412 * <p>If this view has an alpha value set to < 1.0 by calling 11413 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 11414 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 11415 * equivalent to setting a hardware layer on this view and providing a paint with 11416 * the desired alpha value.<p> 11417 * 11418 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 11419 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 11420 * for more information on when and how to use layers.</p> 11421 * 11422 * @param layerType The ype of layer to use with this view, must be one of 11423 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11424 * {@link #LAYER_TYPE_HARDWARE} 11425 * @param paint The paint used to compose the layer. This argument is optional 11426 * and can be null. It is ignored when the layer type is 11427 * {@link #LAYER_TYPE_NONE} 11428 * 11429 * @see #getLayerType() 11430 * @see #LAYER_TYPE_NONE 11431 * @see #LAYER_TYPE_SOFTWARE 11432 * @see #LAYER_TYPE_HARDWARE 11433 * @see #setAlpha(float) 11434 * 11435 * @attr ref android.R.styleable#View_layerType 11436 */ 11437 public void setLayerType(int layerType, Paint paint) { 11438 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 11439 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 11440 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 11441 } 11442 11443 if (layerType == mLayerType) { 11444 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 11445 mLayerPaint = paint == null ? new Paint() : paint; 11446 invalidateParentCaches(); 11447 invalidate(true); 11448 } 11449 return; 11450 } 11451 11452 // Destroy any previous software drawing cache if needed 11453 switch (mLayerType) { 11454 case LAYER_TYPE_HARDWARE: 11455 destroyLayer(false); 11456 // fall through - non-accelerated views may use software layer mechanism instead 11457 case LAYER_TYPE_SOFTWARE: 11458 destroyDrawingCache(); 11459 break; 11460 default: 11461 break; 11462 } 11463 11464 mLayerType = layerType; 11465 final boolean layerDisabled = mLayerType == LAYER_TYPE_NONE; 11466 mLayerPaint = layerDisabled ? null : (paint == null ? new Paint() : paint); 11467 mLocalDirtyRect = layerDisabled ? null : new Rect(); 11468 11469 invalidateParentCaches(); 11470 invalidate(true); 11471 } 11472 11473 /** 11474 * Indicates whether this view has a static layer. A view with layer type 11475 * {@link #LAYER_TYPE_NONE} is a static layer. Other types of layers are 11476 * dynamic. 11477 */ 11478 boolean hasStaticLayer() { 11479 return true; 11480 } 11481 11482 /** 11483 * Indicates what type of layer is currently associated with this view. By default 11484 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 11485 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 11486 * for more information on the different types of layers. 11487 * 11488 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 11489 * {@link #LAYER_TYPE_HARDWARE} 11490 * 11491 * @see #setLayerType(int, android.graphics.Paint) 11492 * @see #buildLayer() 11493 * @see #LAYER_TYPE_NONE 11494 * @see #LAYER_TYPE_SOFTWARE 11495 * @see #LAYER_TYPE_HARDWARE 11496 */ 11497 public int getLayerType() { 11498 return mLayerType; 11499 } 11500 11501 /** 11502 * Forces this view's layer to be created and this view to be rendered 11503 * into its layer. If this view's layer type is set to {@link #LAYER_TYPE_NONE}, 11504 * invoking this method will have no effect. 11505 * 11506 * This method can for instance be used to render a view into its layer before 11507 * starting an animation. If this view is complex, rendering into the layer 11508 * before starting the animation will avoid skipping frames. 11509 * 11510 * @throws IllegalStateException If this view is not attached to a window 11511 * 11512 * @see #setLayerType(int, android.graphics.Paint) 11513 */ 11514 public void buildLayer() { 11515 if (mLayerType == LAYER_TYPE_NONE) return; 11516 11517 if (mAttachInfo == null) { 11518 throw new IllegalStateException("This view must be attached to a window first"); 11519 } 11520 11521 switch (mLayerType) { 11522 case LAYER_TYPE_HARDWARE: 11523 if (mAttachInfo.mHardwareRenderer != null && 11524 mAttachInfo.mHardwareRenderer.isEnabled() && 11525 mAttachInfo.mHardwareRenderer.validate()) { 11526 getHardwareLayer(); 11527 } 11528 break; 11529 case LAYER_TYPE_SOFTWARE: 11530 buildDrawingCache(true); 11531 break; 11532 } 11533 } 11534 11535 // Make sure the HardwareRenderer.validate() was invoked before calling this method 11536 void flushLayer() { 11537 if (mLayerType == LAYER_TYPE_HARDWARE && mHardwareLayer != null) { 11538 mHardwareLayer.flush(); 11539 } 11540 } 11541 11542 /** 11543 * <p>Returns a hardware layer that can be used to draw this view again 11544 * without executing its draw method.</p> 11545 * 11546 * @return A HardwareLayer ready to render, or null if an error occurred. 11547 */ 11548 HardwareLayer getHardwareLayer() { 11549 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null || 11550 !mAttachInfo.mHardwareRenderer.isEnabled()) { 11551 return null; 11552 } 11553 11554 if (!mAttachInfo.mHardwareRenderer.validate()) return null; 11555 11556 final int width = mRight - mLeft; 11557 final int height = mBottom - mTop; 11558 11559 if (width == 0 || height == 0) { 11560 return null; 11561 } 11562 11563 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 11564 if (mHardwareLayer == null) { 11565 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 11566 width, height, isOpaque()); 11567 mLocalDirtyRect.set(0, 0, width, height); 11568 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 11569 mHardwareLayer.resize(width, height); 11570 mLocalDirtyRect.set(0, 0, width, height); 11571 } 11572 11573 // The layer is not valid if the underlying GPU resources cannot be allocated 11574 if (!mHardwareLayer.isValid()) { 11575 return null; 11576 } 11577 11578 mHardwareLayer.redraw(getHardwareLayerDisplayList(mHardwareLayer), mLocalDirtyRect); 11579 mLocalDirtyRect.setEmpty(); 11580 } 11581 11582 return mHardwareLayer; 11583 } 11584 11585 /** 11586 * Destroys this View's hardware layer if possible. 11587 * 11588 * @return True if the layer was destroyed, false otherwise. 11589 * 11590 * @see #setLayerType(int, android.graphics.Paint) 11591 * @see #LAYER_TYPE_HARDWARE 11592 */ 11593 boolean destroyLayer(boolean valid) { 11594 if (mHardwareLayer != null) { 11595 AttachInfo info = mAttachInfo; 11596 if (info != null && info.mHardwareRenderer != null && 11597 info.mHardwareRenderer.isEnabled() && 11598 (valid || info.mHardwareRenderer.validate())) { 11599 mHardwareLayer.destroy(); 11600 mHardwareLayer = null; 11601 11602 invalidate(true); 11603 invalidateParentCaches(); 11604 } 11605 return true; 11606 } 11607 return false; 11608 } 11609 11610 /** 11611 * Destroys all hardware rendering resources. This method is invoked 11612 * when the system needs to reclaim resources. Upon execution of this 11613 * method, you should free any OpenGL resources created by the view. 11614 * 11615 * Note: you <strong>must</strong> call 11616 * <code>super.destroyHardwareResources()</code> when overriding 11617 * this method. 11618 * 11619 * @hide 11620 */ 11621 protected void destroyHardwareResources() { 11622 destroyLayer(true); 11623 } 11624 11625 /** 11626 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 11627 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 11628 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 11629 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 11630 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 11631 * null.</p> 11632 * 11633 * <p>Enabling the drawing cache is similar to 11634 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 11635 * acceleration is turned off. When hardware acceleration is turned on, enabling the 11636 * drawing cache has no effect on rendering because the system uses a different mechanism 11637 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 11638 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 11639 * for information on how to enable software and hardware layers.</p> 11640 * 11641 * <p>This API can be used to manually generate 11642 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 11643 * {@link #getDrawingCache()}.</p> 11644 * 11645 * @param enabled true to enable the drawing cache, false otherwise 11646 * 11647 * @see #isDrawingCacheEnabled() 11648 * @see #getDrawingCache() 11649 * @see #buildDrawingCache() 11650 * @see #setLayerType(int, android.graphics.Paint) 11651 */ 11652 public void setDrawingCacheEnabled(boolean enabled) { 11653 mCachingFailed = false; 11654 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 11655 } 11656 11657 /** 11658 * <p>Indicates whether the drawing cache is enabled for this view.</p> 11659 * 11660 * @return true if the drawing cache is enabled 11661 * 11662 * @see #setDrawingCacheEnabled(boolean) 11663 * @see #getDrawingCache() 11664 */ 11665 @ViewDebug.ExportedProperty(category = "drawing") 11666 public boolean isDrawingCacheEnabled() { 11667 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 11668 } 11669 11670 /** 11671 * Debugging utility which recursively outputs the dirty state of a view and its 11672 * descendants. 11673 * 11674 * @hide 11675 */ 11676 @SuppressWarnings({"UnusedDeclaration"}) 11677 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 11678 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 11679 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 11680 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 11681 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 11682 if (clear) { 11683 mPrivateFlags &= clearMask; 11684 } 11685 if (this instanceof ViewGroup) { 11686 ViewGroup parent = (ViewGroup) this; 11687 final int count = parent.getChildCount(); 11688 for (int i = 0; i < count; i++) { 11689 final View child = parent.getChildAt(i); 11690 child.outputDirtyFlags(indent + " ", clear, clearMask); 11691 } 11692 } 11693 } 11694 11695 /** 11696 * This method is used by ViewGroup to cause its children to restore or recreate their 11697 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 11698 * to recreate its own display list, which would happen if it went through the normal 11699 * draw/dispatchDraw mechanisms. 11700 * 11701 * @hide 11702 */ 11703 protected void dispatchGetDisplayList() {} 11704 11705 /** 11706 * A view that is not attached or hardware accelerated cannot create a display list. 11707 * This method checks these conditions and returns the appropriate result. 11708 * 11709 * @return true if view has the ability to create a display list, false otherwise. 11710 * 11711 * @hide 11712 */ 11713 public boolean canHaveDisplayList() { 11714 return !(mAttachInfo == null || mAttachInfo.mHardwareRenderer == null); 11715 } 11716 11717 /** 11718 * @return The HardwareRenderer associated with that view or null if hardware rendering 11719 * is not supported or this this has not been attached to a window. 11720 * 11721 * @hide 11722 */ 11723 public HardwareRenderer getHardwareRenderer() { 11724 if (mAttachInfo != null) { 11725 return mAttachInfo.mHardwareRenderer; 11726 } 11727 return null; 11728 } 11729 11730 /** 11731 * Returns a DisplayList. If the incoming displayList is null, one will be created. 11732 * Otherwise, the same display list will be returned (after having been rendered into 11733 * along the way, depending on the invalidation state of the view). 11734 * 11735 * @param displayList The previous version of this displayList, could be null. 11736 * @param isLayer Whether the requester of the display list is a layer. If so, 11737 * the view will avoid creating a layer inside the resulting display list. 11738 * @return A new or reused DisplayList object. 11739 */ 11740 private DisplayList getDisplayList(DisplayList displayList, boolean isLayer) { 11741 if (!canHaveDisplayList()) { 11742 return null; 11743 } 11744 11745 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 11746 displayList == null || !displayList.isValid() || 11747 (!isLayer && mRecreateDisplayList))) { 11748 // Don't need to recreate the display list, just need to tell our 11749 // children to restore/recreate theirs 11750 if (displayList != null && displayList.isValid() && 11751 !isLayer && !mRecreateDisplayList) { 11752 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 11753 mPrivateFlags &= ~DIRTY_MASK; 11754 dispatchGetDisplayList(); 11755 11756 return displayList; 11757 } 11758 11759 if (!isLayer) { 11760 // If we got here, we're recreating it. Mark it as such to ensure that 11761 // we copy in child display lists into ours in drawChild() 11762 mRecreateDisplayList = true; 11763 } 11764 if (displayList == null) { 11765 final String name = getClass().getSimpleName(); 11766 displayList = mAttachInfo.mHardwareRenderer.createDisplayList(name); 11767 // If we're creating a new display list, make sure our parent gets invalidated 11768 // since they will need to recreate their display list to account for this 11769 // new child display list. 11770 invalidateParentCaches(); 11771 } 11772 11773 boolean caching = false; 11774 final HardwareCanvas canvas = displayList.start(); 11775 int restoreCount = 0; 11776 int width = mRight - mLeft; 11777 int height = mBottom - mTop; 11778 11779 try { 11780 canvas.setViewport(width, height); 11781 // The dirty rect should always be null for a display list 11782 canvas.onPreDraw(null); 11783 int layerType = ( 11784 !(mParent instanceof ViewGroup) || ((ViewGroup)mParent).mDrawLayers) ? 11785 getLayerType() : LAYER_TYPE_NONE; 11786 if (!isLayer && layerType != LAYER_TYPE_NONE) { 11787 if (layerType == LAYER_TYPE_HARDWARE) { 11788 final HardwareLayer layer = getHardwareLayer(); 11789 if (layer != null && layer.isValid()) { 11790 canvas.drawHardwareLayer(layer, 0, 0, mLayerPaint); 11791 } else { 11792 canvas.saveLayer(0, 0, mRight - mLeft, mBottom - mTop, mLayerPaint, 11793 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | 11794 Canvas.CLIP_TO_LAYER_SAVE_FLAG); 11795 } 11796 caching = true; 11797 } else { 11798 buildDrawingCache(true); 11799 Bitmap cache = getDrawingCache(true); 11800 if (cache != null) { 11801 canvas.drawBitmap(cache, 0, 0, mLayerPaint); 11802 caching = true; 11803 } 11804 } 11805 } else { 11806 11807 computeScroll(); 11808 11809 canvas.translate(-mScrollX, -mScrollY); 11810 if (!isLayer) { 11811 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 11812 mPrivateFlags &= ~DIRTY_MASK; 11813 } 11814 11815 // Fast path for layouts with no backgrounds 11816 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 11817 dispatchDraw(canvas); 11818 } else { 11819 draw(canvas); 11820 } 11821 } 11822 } finally { 11823 canvas.onPostDraw(); 11824 11825 displayList.end(); 11826 displayList.setCaching(caching); 11827 if (isLayer) { 11828 displayList.setLeftTopRightBottom(0, 0, width, height); 11829 } else { 11830 setDisplayListProperties(displayList); 11831 } 11832 } 11833 } else if (!isLayer) { 11834 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 11835 mPrivateFlags &= ~DIRTY_MASK; 11836 } 11837 11838 return displayList; 11839 } 11840 11841 /** 11842 * Get the DisplayList for the HardwareLayer 11843 * 11844 * @param layer The HardwareLayer whose DisplayList we want 11845 * @return A DisplayList fopr the specified HardwareLayer 11846 */ 11847 private DisplayList getHardwareLayerDisplayList(HardwareLayer layer) { 11848 DisplayList displayList = getDisplayList(layer.getDisplayList(), true); 11849 layer.setDisplayList(displayList); 11850 return displayList; 11851 } 11852 11853 11854 /** 11855 * <p>Returns a display list that can be used to draw this view again 11856 * without executing its draw method.</p> 11857 * 11858 * @return A DisplayList ready to replay, or null if caching is not enabled. 11859 * 11860 * @hide 11861 */ 11862 public DisplayList getDisplayList() { 11863 mDisplayList = getDisplayList(mDisplayList, false); 11864 return mDisplayList; 11865 } 11866 11867 /** 11868 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 11869 * 11870 * @return A non-scaled bitmap representing this view or null if cache is disabled. 11871 * 11872 * @see #getDrawingCache(boolean) 11873 */ 11874 public Bitmap getDrawingCache() { 11875 return getDrawingCache(false); 11876 } 11877 11878 /** 11879 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 11880 * is null when caching is disabled. If caching is enabled and the cache is not ready, 11881 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 11882 * draw from the cache when the cache is enabled. To benefit from the cache, you must 11883 * request the drawing cache by calling this method and draw it on screen if the 11884 * returned bitmap is not null.</p> 11885 * 11886 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 11887 * this method will create a bitmap of the same size as this view. Because this bitmap 11888 * will be drawn scaled by the parent ViewGroup, the result on screen might show 11889 * scaling artifacts. To avoid such artifacts, you should call this method by setting 11890 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 11891 * size than the view. This implies that your application must be able to handle this 11892 * size.</p> 11893 * 11894 * @param autoScale Indicates whether the generated bitmap should be scaled based on 11895 * the current density of the screen when the application is in compatibility 11896 * mode. 11897 * 11898 * @return A bitmap representing this view or null if cache is disabled. 11899 * 11900 * @see #setDrawingCacheEnabled(boolean) 11901 * @see #isDrawingCacheEnabled() 11902 * @see #buildDrawingCache(boolean) 11903 * @see #destroyDrawingCache() 11904 */ 11905 public Bitmap getDrawingCache(boolean autoScale) { 11906 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 11907 return null; 11908 } 11909 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 11910 buildDrawingCache(autoScale); 11911 } 11912 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 11913 } 11914 11915 /** 11916 * <p>Frees the resources used by the drawing cache. If you call 11917 * {@link #buildDrawingCache()} manually without calling 11918 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 11919 * should cleanup the cache with this method afterwards.</p> 11920 * 11921 * @see #setDrawingCacheEnabled(boolean) 11922 * @see #buildDrawingCache() 11923 * @see #getDrawingCache() 11924 */ 11925 public void destroyDrawingCache() { 11926 if (mDrawingCache != null) { 11927 mDrawingCache.recycle(); 11928 mDrawingCache = null; 11929 } 11930 if (mUnscaledDrawingCache != null) { 11931 mUnscaledDrawingCache.recycle(); 11932 mUnscaledDrawingCache = null; 11933 } 11934 } 11935 11936 /** 11937 * Setting a solid background color for the drawing cache's bitmaps will improve 11938 * performance and memory usage. Note, though that this should only be used if this 11939 * view will always be drawn on top of a solid color. 11940 * 11941 * @param color The background color to use for the drawing cache's bitmap 11942 * 11943 * @see #setDrawingCacheEnabled(boolean) 11944 * @see #buildDrawingCache() 11945 * @see #getDrawingCache() 11946 */ 11947 public void setDrawingCacheBackgroundColor(int color) { 11948 if (color != mDrawingCacheBackgroundColor) { 11949 mDrawingCacheBackgroundColor = color; 11950 mPrivateFlags &= ~DRAWING_CACHE_VALID; 11951 } 11952 } 11953 11954 /** 11955 * @see #setDrawingCacheBackgroundColor(int) 11956 * 11957 * @return The background color to used for the drawing cache's bitmap 11958 */ 11959 public int getDrawingCacheBackgroundColor() { 11960 return mDrawingCacheBackgroundColor; 11961 } 11962 11963 /** 11964 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 11965 * 11966 * @see #buildDrawingCache(boolean) 11967 */ 11968 public void buildDrawingCache() { 11969 buildDrawingCache(false); 11970 } 11971 11972 /** 11973 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 11974 * 11975 * <p>If you call {@link #buildDrawingCache()} manually without calling 11976 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 11977 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 11978 * 11979 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 11980 * this method will create a bitmap of the same size as this view. Because this bitmap 11981 * will be drawn scaled by the parent ViewGroup, the result on screen might show 11982 * scaling artifacts. To avoid such artifacts, you should call this method by setting 11983 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 11984 * size than the view. This implies that your application must be able to handle this 11985 * size.</p> 11986 * 11987 * <p>You should avoid calling this method when hardware acceleration is enabled. If 11988 * you do not need the drawing cache bitmap, calling this method will increase memory 11989 * usage and cause the view to be rendered in software once, thus negatively impacting 11990 * performance.</p> 11991 * 11992 * @see #getDrawingCache() 11993 * @see #destroyDrawingCache() 11994 */ 11995 public void buildDrawingCache(boolean autoScale) { 11996 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 11997 mDrawingCache == null : mUnscaledDrawingCache == null)) { 11998 mCachingFailed = false; 11999 12000 if (ViewDebug.TRACE_HIERARCHY) { 12001 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 12002 } 12003 12004 int width = mRight - mLeft; 12005 int height = mBottom - mTop; 12006 12007 final AttachInfo attachInfo = mAttachInfo; 12008 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 12009 12010 if (autoScale && scalingRequired) { 12011 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 12012 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 12013 } 12014 12015 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 12016 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 12017 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 12018 12019 if (width <= 0 || height <= 0 || 12020 // Projected bitmap size in bytes 12021 (width * height * (opaque && !use32BitCache ? 2 : 4) > 12022 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 12023 destroyDrawingCache(); 12024 mCachingFailed = true; 12025 return; 12026 } 12027 12028 boolean clear = true; 12029 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 12030 12031 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 12032 Bitmap.Config quality; 12033 if (!opaque) { 12034 // Never pick ARGB_4444 because it looks awful 12035 // Keep the DRAWING_CACHE_QUALITY_LOW flag just in case 12036 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 12037 case DRAWING_CACHE_QUALITY_AUTO: 12038 quality = Bitmap.Config.ARGB_8888; 12039 break; 12040 case DRAWING_CACHE_QUALITY_LOW: 12041 quality = Bitmap.Config.ARGB_8888; 12042 break; 12043 case DRAWING_CACHE_QUALITY_HIGH: 12044 quality = Bitmap.Config.ARGB_8888; 12045 break; 12046 default: 12047 quality = Bitmap.Config.ARGB_8888; 12048 break; 12049 } 12050 } else { 12051 // Optimization for translucent windows 12052 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 12053 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 12054 } 12055 12056 // Try to cleanup memory 12057 if (bitmap != null) bitmap.recycle(); 12058 12059 try { 12060 bitmap = Bitmap.createBitmap(width, height, quality); 12061 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 12062 if (autoScale) { 12063 mDrawingCache = bitmap; 12064 } else { 12065 mUnscaledDrawingCache = bitmap; 12066 } 12067 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 12068 } catch (OutOfMemoryError e) { 12069 // If there is not enough memory to create the bitmap cache, just 12070 // ignore the issue as bitmap caches are not required to draw the 12071 // view hierarchy 12072 if (autoScale) { 12073 mDrawingCache = null; 12074 } else { 12075 mUnscaledDrawingCache = null; 12076 } 12077 mCachingFailed = true; 12078 return; 12079 } 12080 12081 clear = drawingCacheBackgroundColor != 0; 12082 } 12083 12084 Canvas canvas; 12085 if (attachInfo != null) { 12086 canvas = attachInfo.mCanvas; 12087 if (canvas == null) { 12088 canvas = new Canvas(); 12089 } 12090 canvas.setBitmap(bitmap); 12091 // Temporarily clobber the cached Canvas in case one of our children 12092 // is also using a drawing cache. Without this, the children would 12093 // steal the canvas by attaching their own bitmap to it and bad, bad 12094 // thing would happen (invisible views, corrupted drawings, etc.) 12095 attachInfo.mCanvas = null; 12096 } else { 12097 // This case should hopefully never or seldom happen 12098 canvas = new Canvas(bitmap); 12099 } 12100 12101 if (clear) { 12102 bitmap.eraseColor(drawingCacheBackgroundColor); 12103 } 12104 12105 computeScroll(); 12106 final int restoreCount = canvas.save(); 12107 12108 if (autoScale && scalingRequired) { 12109 final float scale = attachInfo.mApplicationScale; 12110 canvas.scale(scale, scale); 12111 } 12112 12113 canvas.translate(-mScrollX, -mScrollY); 12114 12115 mPrivateFlags |= DRAWN; 12116 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 12117 mLayerType != LAYER_TYPE_NONE) { 12118 mPrivateFlags |= DRAWING_CACHE_VALID; 12119 } 12120 12121 // Fast path for layouts with no backgrounds 12122 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12123 if (ViewDebug.TRACE_HIERARCHY) { 12124 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12125 } 12126 mPrivateFlags &= ~DIRTY_MASK; 12127 dispatchDraw(canvas); 12128 } else { 12129 draw(canvas); 12130 } 12131 12132 canvas.restoreToCount(restoreCount); 12133 canvas.setBitmap(null); 12134 12135 if (attachInfo != null) { 12136 // Restore the cached Canvas for our siblings 12137 attachInfo.mCanvas = canvas; 12138 } 12139 } 12140 } 12141 12142 /** 12143 * Create a snapshot of the view into a bitmap. We should probably make 12144 * some form of this public, but should think about the API. 12145 */ 12146 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 12147 int width = mRight - mLeft; 12148 int height = mBottom - mTop; 12149 12150 final AttachInfo attachInfo = mAttachInfo; 12151 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 12152 width = (int) ((width * scale) + 0.5f); 12153 height = (int) ((height * scale) + 0.5f); 12154 12155 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 12156 if (bitmap == null) { 12157 throw new OutOfMemoryError(); 12158 } 12159 12160 Resources resources = getResources(); 12161 if (resources != null) { 12162 bitmap.setDensity(resources.getDisplayMetrics().densityDpi); 12163 } 12164 12165 Canvas canvas; 12166 if (attachInfo != null) { 12167 canvas = attachInfo.mCanvas; 12168 if (canvas == null) { 12169 canvas = new Canvas(); 12170 } 12171 canvas.setBitmap(bitmap); 12172 // Temporarily clobber the cached Canvas in case one of our children 12173 // is also using a drawing cache. Without this, the children would 12174 // steal the canvas by attaching their own bitmap to it and bad, bad 12175 // things would happen (invisible views, corrupted drawings, etc.) 12176 attachInfo.mCanvas = null; 12177 } else { 12178 // This case should hopefully never or seldom happen 12179 canvas = new Canvas(bitmap); 12180 } 12181 12182 if ((backgroundColor & 0xff000000) != 0) { 12183 bitmap.eraseColor(backgroundColor); 12184 } 12185 12186 computeScroll(); 12187 final int restoreCount = canvas.save(); 12188 canvas.scale(scale, scale); 12189 canvas.translate(-mScrollX, -mScrollY); 12190 12191 // Temporarily remove the dirty mask 12192 int flags = mPrivateFlags; 12193 mPrivateFlags &= ~DIRTY_MASK; 12194 12195 // Fast path for layouts with no backgrounds 12196 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12197 dispatchDraw(canvas); 12198 } else { 12199 draw(canvas); 12200 } 12201 12202 mPrivateFlags = flags; 12203 12204 canvas.restoreToCount(restoreCount); 12205 canvas.setBitmap(null); 12206 12207 if (attachInfo != null) { 12208 // Restore the cached Canvas for our siblings 12209 attachInfo.mCanvas = canvas; 12210 } 12211 12212 return bitmap; 12213 } 12214 12215 /** 12216 * Indicates whether this View is currently in edit mode. A View is usually 12217 * in edit mode when displayed within a developer tool. For instance, if 12218 * this View is being drawn by a visual user interface builder, this method 12219 * should return true. 12220 * 12221 * Subclasses should check the return value of this method to provide 12222 * different behaviors if their normal behavior might interfere with the 12223 * host environment. For instance: the class spawns a thread in its 12224 * constructor, the drawing code relies on device-specific features, etc. 12225 * 12226 * This method is usually checked in the drawing code of custom widgets. 12227 * 12228 * @return True if this View is in edit mode, false otherwise. 12229 */ 12230 public boolean isInEditMode() { 12231 return false; 12232 } 12233 12234 /** 12235 * If the View draws content inside its padding and enables fading edges, 12236 * it needs to support padding offsets. Padding offsets are added to the 12237 * fading edges to extend the length of the fade so that it covers pixels 12238 * drawn inside the padding. 12239 * 12240 * Subclasses of this class should override this method if they need 12241 * to draw content inside the padding. 12242 * 12243 * @return True if padding offset must be applied, false otherwise. 12244 * 12245 * @see #getLeftPaddingOffset() 12246 * @see #getRightPaddingOffset() 12247 * @see #getTopPaddingOffset() 12248 * @see #getBottomPaddingOffset() 12249 * 12250 * @since CURRENT 12251 */ 12252 protected boolean isPaddingOffsetRequired() { 12253 return false; 12254 } 12255 12256 /** 12257 * Amount by which to extend the left fading region. Called only when 12258 * {@link #isPaddingOffsetRequired()} returns true. 12259 * 12260 * @return The left padding offset in pixels. 12261 * 12262 * @see #isPaddingOffsetRequired() 12263 * 12264 * @since CURRENT 12265 */ 12266 protected int getLeftPaddingOffset() { 12267 return 0; 12268 } 12269 12270 /** 12271 * Amount by which to extend the right fading region. Called only when 12272 * {@link #isPaddingOffsetRequired()} returns true. 12273 * 12274 * @return The right padding offset in pixels. 12275 * 12276 * @see #isPaddingOffsetRequired() 12277 * 12278 * @since CURRENT 12279 */ 12280 protected int getRightPaddingOffset() { 12281 return 0; 12282 } 12283 12284 /** 12285 * Amount by which to extend the top fading region. Called only when 12286 * {@link #isPaddingOffsetRequired()} returns true. 12287 * 12288 * @return The top padding offset in pixels. 12289 * 12290 * @see #isPaddingOffsetRequired() 12291 * 12292 * @since CURRENT 12293 */ 12294 protected int getTopPaddingOffset() { 12295 return 0; 12296 } 12297 12298 /** 12299 * Amount by which to extend the bottom fading region. Called only when 12300 * {@link #isPaddingOffsetRequired()} returns true. 12301 * 12302 * @return The bottom padding offset in pixels. 12303 * 12304 * @see #isPaddingOffsetRequired() 12305 * 12306 * @since CURRENT 12307 */ 12308 protected int getBottomPaddingOffset() { 12309 return 0; 12310 } 12311 12312 /** 12313 * @hide 12314 * @param offsetRequired 12315 */ 12316 protected int getFadeTop(boolean offsetRequired) { 12317 int top = mPaddingTop; 12318 if (offsetRequired) top += getTopPaddingOffset(); 12319 return top; 12320 } 12321 12322 /** 12323 * @hide 12324 * @param offsetRequired 12325 */ 12326 protected int getFadeHeight(boolean offsetRequired) { 12327 int padding = mPaddingTop; 12328 if (offsetRequired) padding += getTopPaddingOffset(); 12329 return mBottom - mTop - mPaddingBottom - padding; 12330 } 12331 12332 /** 12333 * <p>Indicates whether this view is attached to a hardware accelerated 12334 * window or not.</p> 12335 * 12336 * <p>Even if this method returns true, it does not mean that every call 12337 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 12338 * accelerated {@link android.graphics.Canvas}. For instance, if this view 12339 * is drawn onto an offscreen {@link android.graphics.Bitmap} and its 12340 * window is hardware accelerated, 12341 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 12342 * return false, and this method will return true.</p> 12343 * 12344 * @return True if the view is attached to a window and the window is 12345 * hardware accelerated; false in any other case. 12346 */ 12347 public boolean isHardwareAccelerated() { 12348 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12349 } 12350 12351 /** 12352 * Utility function, called by draw(canvas, parent, drawingTime) to handle the less common 12353 * case of an active Animation being run on the view. 12354 */ 12355 private boolean drawAnimation(ViewGroup parent, long drawingTime, 12356 Animation a, boolean scalingRequired) { 12357 Transformation invalidationTransform; 12358 final int flags = parent.mGroupFlags; 12359 final boolean initialized = a.isInitialized(); 12360 if (!initialized) { 12361 a.initialize(mRight - mLeft, mBottom - mTop, parent.getWidth(), parent.getHeight()); 12362 a.initializeInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop); 12363 onAnimationStart(); 12364 } 12365 12366 boolean more = a.getTransformation(drawingTime, parent.mChildTransformation, 1f); 12367 if (scalingRequired && mAttachInfo.mApplicationScale != 1f) { 12368 if (parent.mInvalidationTransformation == null) { 12369 parent.mInvalidationTransformation = new Transformation(); 12370 } 12371 invalidationTransform = parent.mInvalidationTransformation; 12372 a.getTransformation(drawingTime, invalidationTransform, 1f); 12373 } else { 12374 invalidationTransform = parent.mChildTransformation; 12375 } 12376 if (more) { 12377 if (!a.willChangeBounds()) { 12378 if ((flags & (parent.FLAG_OPTIMIZE_INVALIDATE | parent.FLAG_ANIMATION_DONE)) == 12379 parent.FLAG_OPTIMIZE_INVALIDATE) { 12380 parent.mGroupFlags |= parent.FLAG_INVALIDATE_REQUIRED; 12381 } else if ((flags & parent.FLAG_INVALIDATE_REQUIRED) == 0) { 12382 // The child need to draw an animation, potentially offscreen, so 12383 // make sure we do not cancel invalidate requests 12384 parent.mPrivateFlags |= DRAW_ANIMATION; 12385 parent.invalidate(mLeft, mTop, mRight, mBottom); 12386 } 12387 } else { 12388 if (parent.mInvalidateRegion == null) { 12389 parent.mInvalidateRegion = new RectF(); 12390 } 12391 final RectF region = parent.mInvalidateRegion; 12392 a.getInvalidateRegion(0, 0, mRight - mLeft, mBottom - mTop, region, 12393 invalidationTransform); 12394 12395 // The child need to draw an animation, potentially offscreen, so 12396 // make sure we do not cancel invalidate requests 12397 parent.mPrivateFlags |= DRAW_ANIMATION; 12398 12399 final int left = mLeft + (int) region.left; 12400 final int top = mTop + (int) region.top; 12401 parent.invalidate(left, top, left + (int) (region.width() + .5f), 12402 top + (int) (region.height() + .5f)); 12403 } 12404 } 12405 return more; 12406 } 12407 12408 void setDisplayListProperties() { 12409 setDisplayListProperties(mDisplayList); 12410 } 12411 12412 /** 12413 * This method is called by getDisplayList() when a display list is created or re-rendered. 12414 * It sets or resets the current value of all properties on that display list (resetting is 12415 * necessary when a display list is being re-created, because we need to make sure that 12416 * previously-set transform values 12417 */ 12418 void setDisplayListProperties(DisplayList displayList) { 12419 if (displayList != null) { 12420 displayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 12421 displayList.setHasOverlappingRendering(hasOverlappingRendering()); 12422 if (mParent instanceof ViewGroup) { 12423 displayList.setClipChildren( 12424 (((ViewGroup)mParent).mGroupFlags & ViewGroup.FLAG_CLIP_CHILDREN) != 0); 12425 } 12426 float alpha = 1; 12427 if (mParent instanceof ViewGroup && (((ViewGroup) mParent).mGroupFlags & 12428 ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12429 ViewGroup parentVG = (ViewGroup) mParent; 12430 final boolean hasTransform = 12431 parentVG.getChildStaticTransformation(this, parentVG.mChildTransformation); 12432 if (hasTransform) { 12433 Transformation transform = parentVG.mChildTransformation; 12434 final int transformType = parentVG.mChildTransformation.getTransformationType(); 12435 if (transformType != Transformation.TYPE_IDENTITY) { 12436 if ((transformType & Transformation.TYPE_ALPHA) != 0) { 12437 alpha = transform.getAlpha(); 12438 } 12439 if ((transformType & Transformation.TYPE_MATRIX) != 0) { 12440 displayList.setStaticMatrix(transform.getMatrix()); 12441 } 12442 } 12443 } 12444 } 12445 if (mTransformationInfo != null) { 12446 alpha *= mTransformationInfo.mAlpha; 12447 if (alpha < 1) { 12448 final int multipliedAlpha = (int) (255 * alpha); 12449 if (onSetAlpha(multipliedAlpha)) { 12450 alpha = 1; 12451 } 12452 } 12453 displayList.setTransformationInfo(alpha, 12454 mTransformationInfo.mTranslationX, mTransformationInfo.mTranslationY, 12455 mTransformationInfo.mRotation, mTransformationInfo.mRotationX, 12456 mTransformationInfo.mRotationY, mTransformationInfo.mScaleX, 12457 mTransformationInfo.mScaleY); 12458 if (mTransformationInfo.mCamera == null) { 12459 mTransformationInfo.mCamera = new Camera(); 12460 mTransformationInfo.matrix3D = new Matrix(); 12461 } 12462 displayList.setCameraDistance(mTransformationInfo.mCamera.getLocationZ()); 12463 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == PIVOT_EXPLICITLY_SET) { 12464 displayList.setPivotX(getPivotX()); 12465 displayList.setPivotY(getPivotY()); 12466 } 12467 } else if (alpha < 1) { 12468 displayList.setAlpha(alpha); 12469 } 12470 } 12471 } 12472 12473 /** 12474 * This method is called by ViewGroup.drawChild() to have each child view draw itself. 12475 * This draw() method is an implementation detail and is not intended to be overridden or 12476 * to be called from anywhere else other than ViewGroup.drawChild(). 12477 */ 12478 boolean draw(Canvas canvas, ViewGroup parent, long drawingTime) { 12479 boolean useDisplayListProperties = mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 12480 boolean more = false; 12481 final boolean childHasIdentityMatrix = hasIdentityMatrix(); 12482 final int flags = parent.mGroupFlags; 12483 12484 if ((flags & ViewGroup.FLAG_CLEAR_TRANSFORMATION) == ViewGroup.FLAG_CLEAR_TRANSFORMATION) { 12485 parent.mChildTransformation.clear(); 12486 parent.mGroupFlags &= ~ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12487 } 12488 12489 Transformation transformToApply = null; 12490 boolean concatMatrix = false; 12491 12492 boolean scalingRequired = false; 12493 boolean caching; 12494 int layerType = parent.mDrawLayers ? getLayerType() : LAYER_TYPE_NONE; 12495 12496 final boolean hardwareAccelerated = canvas.isHardwareAccelerated(); 12497 if ((flags & ViewGroup.FLAG_CHILDREN_DRAWN_WITH_CACHE) != 0 || 12498 (flags & ViewGroup.FLAG_ALWAYS_DRAWN_WITH_CACHE) != 0) { 12499 caching = true; 12500 // Auto-scaled apps are not hw-accelerated, no need to set scaling flag on DisplayList 12501 if (mAttachInfo != null) scalingRequired = mAttachInfo.mScalingRequired; 12502 } else { 12503 caching = (layerType != LAYER_TYPE_NONE) || hardwareAccelerated; 12504 } 12505 12506 final Animation a = getAnimation(); 12507 if (a != null) { 12508 more = drawAnimation(parent, drawingTime, a, scalingRequired); 12509 concatMatrix = a.willChangeTransformationMatrix(); 12510 transformToApply = parent.mChildTransformation; 12511 } else if (!useDisplayListProperties && 12512 (flags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 12513 final boolean hasTransform = 12514 parent.getChildStaticTransformation(this, parent.mChildTransformation); 12515 if (hasTransform) { 12516 final int transformType = parent.mChildTransformation.getTransformationType(); 12517 transformToApply = transformType != Transformation.TYPE_IDENTITY ? 12518 parent.mChildTransformation : null; 12519 concatMatrix = (transformType & Transformation.TYPE_MATRIX) != 0; 12520 } 12521 } 12522 12523 concatMatrix |= !childHasIdentityMatrix; 12524 12525 // Sets the flag as early as possible to allow draw() implementations 12526 // to call invalidate() successfully when doing animations 12527 mPrivateFlags |= DRAWN; 12528 12529 if (!concatMatrix && canvas.quickReject(mLeft, mTop, mRight, mBottom, Canvas.EdgeType.BW) && 12530 (mPrivateFlags & DRAW_ANIMATION) == 0) { 12531 return more; 12532 } 12533 12534 if (hardwareAccelerated) { 12535 // Clear INVALIDATED flag to allow invalidation to occur during rendering, but 12536 // retain the flag's value temporarily in the mRecreateDisplayList flag 12537 mRecreateDisplayList = (mPrivateFlags & INVALIDATED) == INVALIDATED; 12538 mPrivateFlags &= ~INVALIDATED; 12539 } 12540 12541 computeScroll(); 12542 12543 final int sx = mScrollX; 12544 final int sy = mScrollY; 12545 12546 DisplayList displayList = null; 12547 Bitmap cache = null; 12548 boolean hasDisplayList = false; 12549 if (caching) { 12550 if (!hardwareAccelerated) { 12551 if (layerType != LAYER_TYPE_NONE) { 12552 layerType = LAYER_TYPE_SOFTWARE; 12553 buildDrawingCache(true); 12554 } 12555 cache = getDrawingCache(true); 12556 } else { 12557 switch (layerType) { 12558 case LAYER_TYPE_SOFTWARE: 12559 if (useDisplayListProperties) { 12560 hasDisplayList = canHaveDisplayList(); 12561 } else { 12562 buildDrawingCache(true); 12563 cache = getDrawingCache(true); 12564 } 12565 break; 12566 case LAYER_TYPE_HARDWARE: 12567 if (useDisplayListProperties) { 12568 hasDisplayList = canHaveDisplayList(); 12569 } 12570 break; 12571 case LAYER_TYPE_NONE: 12572 // Delay getting the display list until animation-driven alpha values are 12573 // set up and possibly passed on to the view 12574 hasDisplayList = canHaveDisplayList(); 12575 break; 12576 } 12577 } 12578 } 12579 useDisplayListProperties &= hasDisplayList; 12580 if (useDisplayListProperties) { 12581 displayList = getDisplayList(); 12582 if (!displayList.isValid()) { 12583 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12584 // to getDisplayList(), the display list will be marked invalid and we should not 12585 // try to use it again. 12586 displayList = null; 12587 hasDisplayList = false; 12588 useDisplayListProperties = false; 12589 } 12590 } 12591 12592 final boolean hasNoCache = cache == null || hasDisplayList; 12593 final boolean offsetForScroll = cache == null && !hasDisplayList && 12594 layerType != LAYER_TYPE_HARDWARE; 12595 12596 int restoreTo = -1; 12597 if (!useDisplayListProperties || transformToApply != null) { 12598 restoreTo = canvas.save(); 12599 } 12600 if (offsetForScroll) { 12601 canvas.translate(mLeft - sx, mTop - sy); 12602 } else { 12603 if (!useDisplayListProperties) { 12604 canvas.translate(mLeft, mTop); 12605 } 12606 if (scalingRequired) { 12607 if (useDisplayListProperties) { 12608 // TODO: Might not need this if we put everything inside the DL 12609 restoreTo = canvas.save(); 12610 } 12611 // mAttachInfo cannot be null, otherwise scalingRequired == false 12612 final float scale = 1.0f / mAttachInfo.mApplicationScale; 12613 canvas.scale(scale, scale); 12614 } 12615 } 12616 12617 float alpha = useDisplayListProperties ? 1 : getAlpha(); 12618 if (transformToApply != null || alpha < 1 || !hasIdentityMatrix()) { 12619 if (transformToApply != null || !childHasIdentityMatrix) { 12620 int transX = 0; 12621 int transY = 0; 12622 12623 if (offsetForScroll) { 12624 transX = -sx; 12625 transY = -sy; 12626 } 12627 12628 if (transformToApply != null) { 12629 if (concatMatrix) { 12630 if (useDisplayListProperties) { 12631 displayList.setAnimationMatrix(transformToApply.getMatrix()); 12632 } else { 12633 // Undo the scroll translation, apply the transformation matrix, 12634 // then redo the scroll translate to get the correct result. 12635 canvas.translate(-transX, -transY); 12636 canvas.concat(transformToApply.getMatrix()); 12637 canvas.translate(transX, transY); 12638 } 12639 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12640 } 12641 12642 float transformAlpha = transformToApply.getAlpha(); 12643 if (transformAlpha < 1) { 12644 alpha *= transformToApply.getAlpha(); 12645 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12646 } 12647 } 12648 12649 if (!childHasIdentityMatrix && !useDisplayListProperties) { 12650 canvas.translate(-transX, -transY); 12651 canvas.concat(getMatrix()); 12652 canvas.translate(transX, transY); 12653 } 12654 } 12655 12656 if (alpha < 1) { 12657 parent.mGroupFlags |= ViewGroup.FLAG_CLEAR_TRANSFORMATION; 12658 if (hasNoCache) { 12659 final int multipliedAlpha = (int) (255 * alpha); 12660 if (!onSetAlpha(multipliedAlpha)) { 12661 int layerFlags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 12662 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) != 0 || 12663 layerType != LAYER_TYPE_NONE) { 12664 layerFlags |= Canvas.CLIP_TO_LAYER_SAVE_FLAG; 12665 } 12666 if (useDisplayListProperties) { 12667 displayList.setAlpha(alpha * getAlpha()); 12668 } else if (layerType == LAYER_TYPE_NONE) { 12669 final int scrollX = hasDisplayList ? 0 : sx; 12670 final int scrollY = hasDisplayList ? 0 : sy; 12671 canvas.saveLayerAlpha(scrollX, scrollY, scrollX + mRight - mLeft, 12672 scrollY + mBottom - mTop, multipliedAlpha, layerFlags); 12673 } 12674 } else { 12675 // Alpha is handled by the child directly, clobber the layer's alpha 12676 mPrivateFlags |= ALPHA_SET; 12677 } 12678 } 12679 } 12680 } else if ((mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 12681 onSetAlpha(255); 12682 mPrivateFlags &= ~ALPHA_SET; 12683 } 12684 12685 if ((flags & ViewGroup.FLAG_CLIP_CHILDREN) == ViewGroup.FLAG_CLIP_CHILDREN && 12686 !useDisplayListProperties) { 12687 if (offsetForScroll) { 12688 canvas.clipRect(sx, sy, sx + (mRight - mLeft), sy + (mBottom - mTop)); 12689 } else { 12690 if (!scalingRequired || cache == null) { 12691 canvas.clipRect(0, 0, mRight - mLeft, mBottom - mTop); 12692 } else { 12693 canvas.clipRect(0, 0, cache.getWidth(), cache.getHeight()); 12694 } 12695 } 12696 } 12697 12698 if (!useDisplayListProperties && hasDisplayList) { 12699 displayList = getDisplayList(); 12700 if (!displayList.isValid()) { 12701 // Uncommon, but possible. If a view is removed from the hierarchy during the call 12702 // to getDisplayList(), the display list will be marked invalid and we should not 12703 // try to use it again. 12704 displayList = null; 12705 hasDisplayList = false; 12706 } 12707 } 12708 12709 if (hasNoCache) { 12710 boolean layerRendered = false; 12711 if (layerType == LAYER_TYPE_HARDWARE && !useDisplayListProperties) { 12712 final HardwareLayer layer = getHardwareLayer(); 12713 if (layer != null && layer.isValid()) { 12714 mLayerPaint.setAlpha((int) (alpha * 255)); 12715 ((HardwareCanvas) canvas).drawHardwareLayer(layer, 0, 0, mLayerPaint); 12716 layerRendered = true; 12717 } else { 12718 final int scrollX = hasDisplayList ? 0 : sx; 12719 final int scrollY = hasDisplayList ? 0 : sy; 12720 canvas.saveLayer(scrollX, scrollY, 12721 scrollX + mRight - mLeft, scrollY + mBottom - mTop, mLayerPaint, 12722 Canvas.HAS_ALPHA_LAYER_SAVE_FLAG | Canvas.CLIP_TO_LAYER_SAVE_FLAG); 12723 } 12724 } 12725 12726 if (!layerRendered) { 12727 if (!hasDisplayList) { 12728 // Fast path for layouts with no backgrounds 12729 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 12730 if (ViewDebug.TRACE_HIERARCHY) { 12731 ViewDebug.trace(parent, ViewDebug.HierarchyTraceType.DRAW); 12732 } 12733 mPrivateFlags &= ~DIRTY_MASK; 12734 dispatchDraw(canvas); 12735 } else { 12736 draw(canvas); 12737 } 12738 } else { 12739 mPrivateFlags &= ~DIRTY_MASK; 12740 ((HardwareCanvas) canvas).drawDisplayList(displayList, null, flags); 12741 } 12742 } 12743 } else if (cache != null) { 12744 mPrivateFlags &= ~DIRTY_MASK; 12745 Paint cachePaint; 12746 12747 if (layerType == LAYER_TYPE_NONE) { 12748 cachePaint = parent.mCachePaint; 12749 if (cachePaint == null) { 12750 cachePaint = new Paint(); 12751 cachePaint.setDither(false); 12752 parent.mCachePaint = cachePaint; 12753 } 12754 if (alpha < 1) { 12755 cachePaint.setAlpha((int) (alpha * 255)); 12756 parent.mGroupFlags |= ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 12757 } else if ((flags & ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE) != 0) { 12758 cachePaint.setAlpha(255); 12759 parent.mGroupFlags &= ~ViewGroup.FLAG_ALPHA_LOWER_THAN_ONE; 12760 } 12761 } else { 12762 cachePaint = mLayerPaint; 12763 cachePaint.setAlpha((int) (alpha * 255)); 12764 } 12765 canvas.drawBitmap(cache, 0.0f, 0.0f, cachePaint); 12766 } 12767 12768 if (restoreTo >= 0) { 12769 canvas.restoreToCount(restoreTo); 12770 } 12771 12772 if (a != null && !more) { 12773 if (!hardwareAccelerated && !a.getFillAfter()) { 12774 onSetAlpha(255); 12775 } 12776 parent.finishAnimatingView(this, a); 12777 } 12778 12779 if (more && hardwareAccelerated) { 12780 // invalidation is the trigger to recreate display lists, so if we're using 12781 // display lists to render, force an invalidate to allow the animation to 12782 // continue drawing another frame 12783 parent.invalidate(true); 12784 if (a.hasAlpha() && (mPrivateFlags & ALPHA_SET) == ALPHA_SET) { 12785 // alpha animations should cause the child to recreate its display list 12786 invalidate(true); 12787 } 12788 } 12789 12790 mRecreateDisplayList = false; 12791 12792 return more; 12793 } 12794 12795 /** 12796 * Manually render this view (and all of its children) to the given Canvas. 12797 * The view must have already done a full layout before this function is 12798 * called. When implementing a view, implement 12799 * {@link #onDraw(android.graphics.Canvas)} instead of overriding this method. 12800 * If you do need to override this method, call the superclass version. 12801 * 12802 * @param canvas The Canvas to which the View is rendered. 12803 */ 12804 public void draw(Canvas canvas) { 12805 if (ViewDebug.TRACE_HIERARCHY) { 12806 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 12807 } 12808 12809 final int privateFlags = mPrivateFlags; 12810 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 12811 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 12812 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 12813 12814 /* 12815 * Draw traversal performs several drawing steps which must be executed 12816 * in the appropriate order: 12817 * 12818 * 1. Draw the background 12819 * 2. If necessary, save the canvas' layers to prepare for fading 12820 * 3. Draw view's content 12821 * 4. Draw children 12822 * 5. If necessary, draw the fading edges and restore layers 12823 * 6. Draw decorations (scrollbars for instance) 12824 */ 12825 12826 // Step 1, draw the background, if needed 12827 int saveCount; 12828 12829 if (!dirtyOpaque) { 12830 final Drawable background = mBackground; 12831 if (background != null) { 12832 final int scrollX = mScrollX; 12833 final int scrollY = mScrollY; 12834 12835 if (mBackgroundSizeChanged) { 12836 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 12837 mBackgroundSizeChanged = false; 12838 } 12839 12840 if ((scrollX | scrollY) == 0) { 12841 background.draw(canvas); 12842 } else { 12843 canvas.translate(scrollX, scrollY); 12844 background.draw(canvas); 12845 canvas.translate(-scrollX, -scrollY); 12846 } 12847 } 12848 } 12849 12850 // skip step 2 & 5 if possible (common case) 12851 final int viewFlags = mViewFlags; 12852 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 12853 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 12854 if (!verticalEdges && !horizontalEdges) { 12855 // Step 3, draw the content 12856 if (!dirtyOpaque) onDraw(canvas); 12857 12858 // Step 4, draw the children 12859 dispatchDraw(canvas); 12860 12861 // Step 6, draw decorations (scrollbars) 12862 onDrawScrollBars(canvas); 12863 12864 // we're done... 12865 return; 12866 } 12867 12868 /* 12869 * Here we do the full fledged routine... 12870 * (this is an uncommon case where speed matters less, 12871 * this is why we repeat some of the tests that have been 12872 * done above) 12873 */ 12874 12875 boolean drawTop = false; 12876 boolean drawBottom = false; 12877 boolean drawLeft = false; 12878 boolean drawRight = false; 12879 12880 float topFadeStrength = 0.0f; 12881 float bottomFadeStrength = 0.0f; 12882 float leftFadeStrength = 0.0f; 12883 float rightFadeStrength = 0.0f; 12884 12885 // Step 2, save the canvas' layers 12886 int paddingLeft = mPaddingLeft; 12887 12888 final boolean offsetRequired = isPaddingOffsetRequired(); 12889 if (offsetRequired) { 12890 paddingLeft += getLeftPaddingOffset(); 12891 } 12892 12893 int left = mScrollX + paddingLeft; 12894 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 12895 int top = mScrollY + getFadeTop(offsetRequired); 12896 int bottom = top + getFadeHeight(offsetRequired); 12897 12898 if (offsetRequired) { 12899 right += getRightPaddingOffset(); 12900 bottom += getBottomPaddingOffset(); 12901 } 12902 12903 final ScrollabilityCache scrollabilityCache = mScrollCache; 12904 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 12905 int length = (int) fadeHeight; 12906 12907 // clip the fade length if top and bottom fades overlap 12908 // overlapping fades produce odd-looking artifacts 12909 if (verticalEdges && (top + length > bottom - length)) { 12910 length = (bottom - top) / 2; 12911 } 12912 12913 // also clip horizontal fades if necessary 12914 if (horizontalEdges && (left + length > right - length)) { 12915 length = (right - left) / 2; 12916 } 12917 12918 if (verticalEdges) { 12919 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 12920 drawTop = topFadeStrength * fadeHeight > 1.0f; 12921 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 12922 drawBottom = bottomFadeStrength * fadeHeight > 1.0f; 12923 } 12924 12925 if (horizontalEdges) { 12926 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 12927 drawLeft = leftFadeStrength * fadeHeight > 1.0f; 12928 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 12929 drawRight = rightFadeStrength * fadeHeight > 1.0f; 12930 } 12931 12932 saveCount = canvas.getSaveCount(); 12933 12934 int solidColor = getSolidColor(); 12935 if (solidColor == 0) { 12936 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 12937 12938 if (drawTop) { 12939 canvas.saveLayer(left, top, right, top + length, null, flags); 12940 } 12941 12942 if (drawBottom) { 12943 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 12944 } 12945 12946 if (drawLeft) { 12947 canvas.saveLayer(left, top, left + length, bottom, null, flags); 12948 } 12949 12950 if (drawRight) { 12951 canvas.saveLayer(right - length, top, right, bottom, null, flags); 12952 } 12953 } else { 12954 scrollabilityCache.setFadeColor(solidColor); 12955 } 12956 12957 // Step 3, draw the content 12958 if (!dirtyOpaque) onDraw(canvas); 12959 12960 // Step 4, draw the children 12961 dispatchDraw(canvas); 12962 12963 // Step 5, draw the fade effect and restore layers 12964 final Paint p = scrollabilityCache.paint; 12965 final Matrix matrix = scrollabilityCache.matrix; 12966 final Shader fade = scrollabilityCache.shader; 12967 12968 if (drawTop) { 12969 matrix.setScale(1, fadeHeight * topFadeStrength); 12970 matrix.postTranslate(left, top); 12971 fade.setLocalMatrix(matrix); 12972 canvas.drawRect(left, top, right, top + length, p); 12973 } 12974 12975 if (drawBottom) { 12976 matrix.setScale(1, fadeHeight * bottomFadeStrength); 12977 matrix.postRotate(180); 12978 matrix.postTranslate(left, bottom); 12979 fade.setLocalMatrix(matrix); 12980 canvas.drawRect(left, bottom - length, right, bottom, p); 12981 } 12982 12983 if (drawLeft) { 12984 matrix.setScale(1, fadeHeight * leftFadeStrength); 12985 matrix.postRotate(-90); 12986 matrix.postTranslate(left, top); 12987 fade.setLocalMatrix(matrix); 12988 canvas.drawRect(left, top, left + length, bottom, p); 12989 } 12990 12991 if (drawRight) { 12992 matrix.setScale(1, fadeHeight * rightFadeStrength); 12993 matrix.postRotate(90); 12994 matrix.postTranslate(right, top); 12995 fade.setLocalMatrix(matrix); 12996 canvas.drawRect(right - length, top, right, bottom, p); 12997 } 12998 12999 canvas.restoreToCount(saveCount); 13000 13001 // Step 6, draw decorations (scrollbars) 13002 onDrawScrollBars(canvas); 13003 } 13004 13005 /** 13006 * Override this if your view is known to always be drawn on top of a solid color background, 13007 * and needs to draw fading edges. Returning a non-zero color enables the view system to 13008 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 13009 * should be set to 0xFF. 13010 * 13011 * @see #setVerticalFadingEdgeEnabled(boolean) 13012 * @see #setHorizontalFadingEdgeEnabled(boolean) 13013 * 13014 * @return The known solid color background for this view, or 0 if the color may vary 13015 */ 13016 @ViewDebug.ExportedProperty(category = "drawing") 13017 public int getSolidColor() { 13018 return 0; 13019 } 13020 13021 /** 13022 * Build a human readable string representation of the specified view flags. 13023 * 13024 * @param flags the view flags to convert to a string 13025 * @return a String representing the supplied flags 13026 */ 13027 private static String printFlags(int flags) { 13028 String output = ""; 13029 int numFlags = 0; 13030 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 13031 output += "TAKES_FOCUS"; 13032 numFlags++; 13033 } 13034 13035 switch (flags & VISIBILITY_MASK) { 13036 case INVISIBLE: 13037 if (numFlags > 0) { 13038 output += " "; 13039 } 13040 output += "INVISIBLE"; 13041 // USELESS HERE numFlags++; 13042 break; 13043 case GONE: 13044 if (numFlags > 0) { 13045 output += " "; 13046 } 13047 output += "GONE"; 13048 // USELESS HERE numFlags++; 13049 break; 13050 default: 13051 break; 13052 } 13053 return output; 13054 } 13055 13056 /** 13057 * Build a human readable string representation of the specified private 13058 * view flags. 13059 * 13060 * @param privateFlags the private view flags to convert to a string 13061 * @return a String representing the supplied flags 13062 */ 13063 private static String printPrivateFlags(int privateFlags) { 13064 String output = ""; 13065 int numFlags = 0; 13066 13067 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 13068 output += "WANTS_FOCUS"; 13069 numFlags++; 13070 } 13071 13072 if ((privateFlags & FOCUSED) == FOCUSED) { 13073 if (numFlags > 0) { 13074 output += " "; 13075 } 13076 output += "FOCUSED"; 13077 numFlags++; 13078 } 13079 13080 if ((privateFlags & SELECTED) == SELECTED) { 13081 if (numFlags > 0) { 13082 output += " "; 13083 } 13084 output += "SELECTED"; 13085 numFlags++; 13086 } 13087 13088 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 13089 if (numFlags > 0) { 13090 output += " "; 13091 } 13092 output += "IS_ROOT_NAMESPACE"; 13093 numFlags++; 13094 } 13095 13096 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 13097 if (numFlags > 0) { 13098 output += " "; 13099 } 13100 output += "HAS_BOUNDS"; 13101 numFlags++; 13102 } 13103 13104 if ((privateFlags & DRAWN) == DRAWN) { 13105 if (numFlags > 0) { 13106 output += " "; 13107 } 13108 output += "DRAWN"; 13109 // USELESS HERE numFlags++; 13110 } 13111 return output; 13112 } 13113 13114 /** 13115 * <p>Indicates whether or not this view's layout will be requested during 13116 * the next hierarchy layout pass.</p> 13117 * 13118 * @return true if the layout will be forced during next layout pass 13119 */ 13120 public boolean isLayoutRequested() { 13121 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 13122 } 13123 13124 /** 13125 * Assign a size and position to a view and all of its 13126 * descendants 13127 * 13128 * <p>This is the second phase of the layout mechanism. 13129 * (The first is measuring). In this phase, each parent calls 13130 * layout on all of its children to position them. 13131 * This is typically done using the child measurements 13132 * that were stored in the measure pass().</p> 13133 * 13134 * <p>Derived classes should not override this method. 13135 * Derived classes with children should override 13136 * onLayout. In that method, they should 13137 * call layout on each of their children.</p> 13138 * 13139 * @param l Left position, relative to parent 13140 * @param t Top position, relative to parent 13141 * @param r Right position, relative to parent 13142 * @param b Bottom position, relative to parent 13143 */ 13144 @SuppressWarnings({"unchecked"}) 13145 public void layout(int l, int t, int r, int b) { 13146 int oldL = mLeft; 13147 int oldT = mTop; 13148 int oldB = mBottom; 13149 int oldR = mRight; 13150 boolean changed = setFrame(l, t, r, b); 13151 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 13152 if (ViewDebug.TRACE_HIERARCHY) { 13153 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 13154 } 13155 13156 onLayout(changed, l, t, r, b); 13157 mPrivateFlags &= ~LAYOUT_REQUIRED; 13158 13159 ListenerInfo li = mListenerInfo; 13160 if (li != null && li.mOnLayoutChangeListeners != null) { 13161 ArrayList<OnLayoutChangeListener> listenersCopy = 13162 (ArrayList<OnLayoutChangeListener>)li.mOnLayoutChangeListeners.clone(); 13163 int numListeners = listenersCopy.size(); 13164 for (int i = 0; i < numListeners; ++i) { 13165 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 13166 } 13167 } 13168 } 13169 mPrivateFlags &= ~FORCE_LAYOUT; 13170 } 13171 13172 /** 13173 * Called from layout when this view should 13174 * assign a size and position to each of its children. 13175 * 13176 * Derived classes with children should override 13177 * this method and call layout on each of 13178 * their children. 13179 * @param changed This is a new size or position for this view 13180 * @param left Left position, relative to parent 13181 * @param top Top position, relative to parent 13182 * @param right Right position, relative to parent 13183 * @param bottom Bottom position, relative to parent 13184 */ 13185 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 13186 } 13187 13188 /** 13189 * Assign a size and position to this view. 13190 * 13191 * This is called from layout. 13192 * 13193 * @param left Left position, relative to parent 13194 * @param top Top position, relative to parent 13195 * @param right Right position, relative to parent 13196 * @param bottom Bottom position, relative to parent 13197 * @return true if the new size and position are different than the 13198 * previous ones 13199 * {@hide} 13200 */ 13201 protected boolean setFrame(int left, int top, int right, int bottom) { 13202 boolean changed = false; 13203 13204 if (DBG) { 13205 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 13206 + right + "," + bottom + ")"); 13207 } 13208 13209 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 13210 changed = true; 13211 13212 // Remember our drawn bit 13213 int drawn = mPrivateFlags & DRAWN; 13214 13215 int oldWidth = mRight - mLeft; 13216 int oldHeight = mBottom - mTop; 13217 int newWidth = right - left; 13218 int newHeight = bottom - top; 13219 boolean sizeChanged = (newWidth != oldWidth) || (newHeight != oldHeight); 13220 13221 // Invalidate our old position 13222 invalidate(sizeChanged); 13223 13224 mLeft = left; 13225 mTop = top; 13226 mRight = right; 13227 mBottom = bottom; 13228 if (mDisplayList != null) { 13229 mDisplayList.setLeftTopRightBottom(mLeft, mTop, mRight, mBottom); 13230 } 13231 13232 mPrivateFlags |= HAS_BOUNDS; 13233 13234 13235 if (sizeChanged) { 13236 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 13237 // A change in dimension means an auto-centered pivot point changes, too 13238 if (mTransformationInfo != null) { 13239 mTransformationInfo.mMatrixDirty = true; 13240 } 13241 } 13242 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 13243 } 13244 13245 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 13246 // If we are visible, force the DRAWN bit to on so that 13247 // this invalidate will go through (at least to our parent). 13248 // This is because someone may have invalidated this view 13249 // before this call to setFrame came in, thereby clearing 13250 // the DRAWN bit. 13251 mPrivateFlags |= DRAWN; 13252 invalidate(sizeChanged); 13253 // parent display list may need to be recreated based on a change in the bounds 13254 // of any child 13255 invalidateParentCaches(); 13256 } 13257 13258 // Reset drawn bit to original value (invalidate turns it off) 13259 mPrivateFlags |= drawn; 13260 13261 mBackgroundSizeChanged = true; 13262 } 13263 return changed; 13264 } 13265 13266 /** 13267 * Finalize inflating a view from XML. This is called as the last phase 13268 * of inflation, after all child views have been added. 13269 * 13270 * <p>Even if the subclass overrides onFinishInflate, they should always be 13271 * sure to call the super method, so that we get called. 13272 */ 13273 protected void onFinishInflate() { 13274 } 13275 13276 /** 13277 * Returns the resources associated with this view. 13278 * 13279 * @return Resources object. 13280 */ 13281 public Resources getResources() { 13282 return mResources; 13283 } 13284 13285 /** 13286 * Invalidates the specified Drawable. 13287 * 13288 * @param drawable the drawable to invalidate 13289 */ 13290 public void invalidateDrawable(Drawable drawable) { 13291 if (verifyDrawable(drawable)) { 13292 final Rect dirty = drawable.getBounds(); 13293 final int scrollX = mScrollX; 13294 final int scrollY = mScrollY; 13295 13296 invalidate(dirty.left + scrollX, dirty.top + scrollY, 13297 dirty.right + scrollX, dirty.bottom + scrollY); 13298 } 13299 } 13300 13301 /** 13302 * Schedules an action on a drawable to occur at a specified time. 13303 * 13304 * @param who the recipient of the action 13305 * @param what the action to run on the drawable 13306 * @param when the time at which the action must occur. Uses the 13307 * {@link SystemClock#uptimeMillis} timebase. 13308 */ 13309 public void scheduleDrawable(Drawable who, Runnable what, long when) { 13310 if (verifyDrawable(who) && what != null) { 13311 final long delay = when - SystemClock.uptimeMillis(); 13312 if (mAttachInfo != null) { 13313 mAttachInfo.mViewRootImpl.mChoreographer.postCallbackDelayed( 13314 Choreographer.CALLBACK_ANIMATION, what, who, 13315 Choreographer.subtractFrameDelay(delay)); 13316 } else { 13317 ViewRootImpl.getRunQueue().postDelayed(what, delay); 13318 } 13319 } 13320 } 13321 13322 /** 13323 * Cancels a scheduled action on a drawable. 13324 * 13325 * @param who the recipient of the action 13326 * @param what the action to cancel 13327 */ 13328 public void unscheduleDrawable(Drawable who, Runnable what) { 13329 if (verifyDrawable(who) && what != null) { 13330 if (mAttachInfo != null) { 13331 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13332 Choreographer.CALLBACK_ANIMATION, what, who); 13333 } else { 13334 ViewRootImpl.getRunQueue().removeCallbacks(what); 13335 } 13336 } 13337 } 13338 13339 /** 13340 * Unschedule any events associated with the given Drawable. This can be 13341 * used when selecting a new Drawable into a view, so that the previous 13342 * one is completely unscheduled. 13343 * 13344 * @param who The Drawable to unschedule. 13345 * 13346 * @see #drawableStateChanged 13347 */ 13348 public void unscheduleDrawable(Drawable who) { 13349 if (mAttachInfo != null && who != null) { 13350 mAttachInfo.mViewRootImpl.mChoreographer.removeCallbacks( 13351 Choreographer.CALLBACK_ANIMATION, null, who); 13352 } 13353 } 13354 13355 /** 13356 * Return the layout direction of a given Drawable. 13357 * 13358 * @param who the Drawable to query 13359 */ 13360 public int getResolvedLayoutDirection(Drawable who) { 13361 return (who == mBackground) ? getResolvedLayoutDirection() : LAYOUT_DIRECTION_DEFAULT; 13362 } 13363 13364 /** 13365 * If your view subclass is displaying its own Drawable objects, it should 13366 * override this function and return true for any Drawable it is 13367 * displaying. This allows animations for those drawables to be 13368 * scheduled. 13369 * 13370 * <p>Be sure to call through to the super class when overriding this 13371 * function. 13372 * 13373 * @param who The Drawable to verify. Return true if it is one you are 13374 * displaying, else return the result of calling through to the 13375 * super class. 13376 * 13377 * @return boolean If true than the Drawable is being displayed in the 13378 * view; else false and it is not allowed to animate. 13379 * 13380 * @see #unscheduleDrawable(android.graphics.drawable.Drawable) 13381 * @see #drawableStateChanged() 13382 */ 13383 protected boolean verifyDrawable(Drawable who) { 13384 return who == mBackground; 13385 } 13386 13387 /** 13388 * This function is called whenever the state of the view changes in such 13389 * a way that it impacts the state of drawables being shown. 13390 * 13391 * <p>Be sure to call through to the superclass when overriding this 13392 * function. 13393 * 13394 * @see Drawable#setState(int[]) 13395 */ 13396 protected void drawableStateChanged() { 13397 Drawable d = mBackground; 13398 if (d != null && d.isStateful()) { 13399 d.setState(getDrawableState()); 13400 } 13401 } 13402 13403 /** 13404 * Call this to force a view to update its drawable state. This will cause 13405 * drawableStateChanged to be called on this view. Views that are interested 13406 * in the new state should call getDrawableState. 13407 * 13408 * @see #drawableStateChanged 13409 * @see #getDrawableState 13410 */ 13411 public void refreshDrawableState() { 13412 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 13413 drawableStateChanged(); 13414 13415 ViewParent parent = mParent; 13416 if (parent != null) { 13417 parent.childDrawableStateChanged(this); 13418 } 13419 } 13420 13421 /** 13422 * Return an array of resource IDs of the drawable states representing the 13423 * current state of the view. 13424 * 13425 * @return The current drawable state 13426 * 13427 * @see Drawable#setState(int[]) 13428 * @see #drawableStateChanged() 13429 * @see #onCreateDrawableState(int) 13430 */ 13431 public final int[] getDrawableState() { 13432 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 13433 return mDrawableState; 13434 } else { 13435 mDrawableState = onCreateDrawableState(0); 13436 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 13437 return mDrawableState; 13438 } 13439 } 13440 13441 /** 13442 * Generate the new {@link android.graphics.drawable.Drawable} state for 13443 * this view. This is called by the view 13444 * system when the cached Drawable state is determined to be invalid. To 13445 * retrieve the current state, you should use {@link #getDrawableState}. 13446 * 13447 * @param extraSpace if non-zero, this is the number of extra entries you 13448 * would like in the returned array in which you can place your own 13449 * states. 13450 * 13451 * @return Returns an array holding the current {@link Drawable} state of 13452 * the view. 13453 * 13454 * @see #mergeDrawableStates(int[], int[]) 13455 */ 13456 protected int[] onCreateDrawableState(int extraSpace) { 13457 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 13458 mParent instanceof View) { 13459 return ((View) mParent).onCreateDrawableState(extraSpace); 13460 } 13461 13462 int[] drawableState; 13463 13464 int privateFlags = mPrivateFlags; 13465 13466 int viewStateIndex = 0; 13467 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 13468 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 13469 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 13470 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 13471 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 13472 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 13473 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested && 13474 HardwareRenderer.isAvailable()) { 13475 // This is set if HW acceleration is requested, even if the current 13476 // process doesn't allow it. This is just to allow app preview 13477 // windows to better match their app. 13478 viewStateIndex |= VIEW_STATE_ACCELERATED; 13479 } 13480 if ((privateFlags & HOVERED) != 0) viewStateIndex |= VIEW_STATE_HOVERED; 13481 13482 final int privateFlags2 = mPrivateFlags2; 13483 if ((privateFlags2 & DRAG_CAN_ACCEPT) != 0) viewStateIndex |= VIEW_STATE_DRAG_CAN_ACCEPT; 13484 if ((privateFlags2 & DRAG_HOVERED) != 0) viewStateIndex |= VIEW_STATE_DRAG_HOVERED; 13485 13486 drawableState = VIEW_STATE_SETS[viewStateIndex]; 13487 13488 //noinspection ConstantIfStatement 13489 if (false) { 13490 Log.i("View", "drawableStateIndex=" + viewStateIndex); 13491 Log.i("View", toString() 13492 + " pressed=" + ((privateFlags & PRESSED) != 0) 13493 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 13494 + " fo=" + hasFocus() 13495 + " sl=" + ((privateFlags & SELECTED) != 0) 13496 + " wf=" + hasWindowFocus() 13497 + ": " + Arrays.toString(drawableState)); 13498 } 13499 13500 if (extraSpace == 0) { 13501 return drawableState; 13502 } 13503 13504 final int[] fullState; 13505 if (drawableState != null) { 13506 fullState = new int[drawableState.length + extraSpace]; 13507 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 13508 } else { 13509 fullState = new int[extraSpace]; 13510 } 13511 13512 return fullState; 13513 } 13514 13515 /** 13516 * Merge your own state values in <var>additionalState</var> into the base 13517 * state values <var>baseState</var> that were returned by 13518 * {@link #onCreateDrawableState(int)}. 13519 * 13520 * @param baseState The base state values returned by 13521 * {@link #onCreateDrawableState(int)}, which will be modified to also hold your 13522 * own additional state values. 13523 * 13524 * @param additionalState The additional state values you would like 13525 * added to <var>baseState</var>; this array is not modified. 13526 * 13527 * @return As a convenience, the <var>baseState</var> array you originally 13528 * passed into the function is returned. 13529 * 13530 * @see #onCreateDrawableState(int) 13531 */ 13532 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 13533 final int N = baseState.length; 13534 int i = N - 1; 13535 while (i >= 0 && baseState[i] == 0) { 13536 i--; 13537 } 13538 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 13539 return baseState; 13540 } 13541 13542 /** 13543 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 13544 * on all Drawable objects associated with this view. 13545 */ 13546 public void jumpDrawablesToCurrentState() { 13547 if (mBackground != null) { 13548 mBackground.jumpToCurrentState(); 13549 } 13550 } 13551 13552 /** 13553 * Sets the background color for this view. 13554 * @param color the color of the background 13555 */ 13556 @RemotableViewMethod 13557 public void setBackgroundColor(int color) { 13558 if (mBackground instanceof ColorDrawable) { 13559 ((ColorDrawable) mBackground).setColor(color); 13560 } else { 13561 setBackground(new ColorDrawable(color)); 13562 } 13563 } 13564 13565 /** 13566 * Set the background to a given resource. The resource should refer to 13567 * a Drawable object or 0 to remove the background. 13568 * @param resid The identifier of the resource. 13569 * 13570 * @attr ref android.R.styleable#View_background 13571 */ 13572 @RemotableViewMethod 13573 public void setBackgroundResource(int resid) { 13574 if (resid != 0 && resid == mBackgroundResource) { 13575 return; 13576 } 13577 13578 Drawable d= null; 13579 if (resid != 0) { 13580 d = mResources.getDrawable(resid); 13581 } 13582 setBackground(d); 13583 13584 mBackgroundResource = resid; 13585 } 13586 13587 /** 13588 * Set the background to a given Drawable, or remove the background. If the 13589 * background has padding, this View's padding is set to the background's 13590 * padding. However, when a background is removed, this View's padding isn't 13591 * touched. If setting the padding is desired, please use 13592 * {@link #setPadding(int, int, int, int)}. 13593 * 13594 * @param background The Drawable to use as the background, or null to remove the 13595 * background 13596 */ 13597 public void setBackground(Drawable background) { 13598 //noinspection deprecation 13599 setBackgroundDrawable(background); 13600 } 13601 13602 /** 13603 * @deprecated use {@link #setBackground(Drawable)} instead 13604 */ 13605 @Deprecated 13606 public void setBackgroundDrawable(Drawable background) { 13607 if (background == mBackground) { 13608 return; 13609 } 13610 13611 boolean requestLayout = false; 13612 13613 mBackgroundResource = 0; 13614 13615 /* 13616 * Regardless of whether we're setting a new background or not, we want 13617 * to clear the previous drawable. 13618 */ 13619 if (mBackground != null) { 13620 mBackground.setCallback(null); 13621 unscheduleDrawable(mBackground); 13622 } 13623 13624 if (background != null) { 13625 Rect padding = sThreadLocal.get(); 13626 if (padding == null) { 13627 padding = new Rect(); 13628 sThreadLocal.set(padding); 13629 } 13630 if (background.getPadding(padding)) { 13631 switch (background.getResolvedLayoutDirectionSelf()) { 13632 case LAYOUT_DIRECTION_RTL: 13633 setPadding(padding.right, padding.top, padding.left, padding.bottom); 13634 break; 13635 case LAYOUT_DIRECTION_LTR: 13636 default: 13637 setPadding(padding.left, padding.top, padding.right, padding.bottom); 13638 } 13639 } 13640 13641 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 13642 // if it has a different minimum size, we should layout again 13643 if (mBackground == null || mBackground.getMinimumHeight() != background.getMinimumHeight() || 13644 mBackground.getMinimumWidth() != background.getMinimumWidth()) { 13645 requestLayout = true; 13646 } 13647 13648 background.setCallback(this); 13649 if (background.isStateful()) { 13650 background.setState(getDrawableState()); 13651 } 13652 background.setVisible(getVisibility() == VISIBLE, false); 13653 mBackground = background; 13654 13655 if ((mPrivateFlags & SKIP_DRAW) != 0) { 13656 mPrivateFlags &= ~SKIP_DRAW; 13657 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 13658 requestLayout = true; 13659 } 13660 } else { 13661 /* Remove the background */ 13662 mBackground = null; 13663 13664 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 13665 /* 13666 * This view ONLY drew the background before and we're removing 13667 * the background, so now it won't draw anything 13668 * (hence we SKIP_DRAW) 13669 */ 13670 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 13671 mPrivateFlags |= SKIP_DRAW; 13672 } 13673 13674 /* 13675 * When the background is set, we try to apply its padding to this 13676 * View. When the background is removed, we don't touch this View's 13677 * padding. This is noted in the Javadocs. Hence, we don't need to 13678 * requestLayout(), the invalidate() below is sufficient. 13679 */ 13680 13681 // The old background's minimum size could have affected this 13682 // View's layout, so let's requestLayout 13683 requestLayout = true; 13684 } 13685 13686 computeOpaqueFlags(); 13687 13688 if (requestLayout) { 13689 requestLayout(); 13690 } 13691 13692 mBackgroundSizeChanged = true; 13693 invalidate(true); 13694 } 13695 13696 /** 13697 * Gets the background drawable 13698 * 13699 * @return The drawable used as the background for this view, if any. 13700 * 13701 * @see #setBackground(Drawable) 13702 * 13703 * @attr ref android.R.styleable#View_background 13704 */ 13705 public Drawable getBackground() { 13706 return mBackground; 13707 } 13708 13709 /** 13710 * Sets the padding. The view may add on the space required to display 13711 * the scrollbars, depending on the style and visibility of the scrollbars. 13712 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 13713 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 13714 * from the values set in this call. 13715 * 13716 * @attr ref android.R.styleable#View_padding 13717 * @attr ref android.R.styleable#View_paddingBottom 13718 * @attr ref android.R.styleable#View_paddingLeft 13719 * @attr ref android.R.styleable#View_paddingRight 13720 * @attr ref android.R.styleable#View_paddingTop 13721 * @param left the left padding in pixels 13722 * @param top the top padding in pixels 13723 * @param right the right padding in pixels 13724 * @param bottom the bottom padding in pixels 13725 */ 13726 public void setPadding(int left, int top, int right, int bottom) { 13727 mUserPaddingStart = -1; 13728 mUserPaddingEnd = -1; 13729 mUserPaddingRelative = false; 13730 13731 internalSetPadding(left, top, right, bottom); 13732 } 13733 13734 private void internalSetPadding(int left, int top, int right, int bottom) { 13735 mUserPaddingLeft = left; 13736 mUserPaddingRight = right; 13737 mUserPaddingBottom = bottom; 13738 13739 final int viewFlags = mViewFlags; 13740 boolean changed = false; 13741 13742 // Common case is there are no scroll bars. 13743 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 13744 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 13745 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 13746 ? 0 : getVerticalScrollbarWidth(); 13747 switch (mVerticalScrollbarPosition) { 13748 case SCROLLBAR_POSITION_DEFAULT: 13749 if (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) { 13750 left += offset; 13751 } else { 13752 right += offset; 13753 } 13754 break; 13755 case SCROLLBAR_POSITION_RIGHT: 13756 right += offset; 13757 break; 13758 case SCROLLBAR_POSITION_LEFT: 13759 left += offset; 13760 break; 13761 } 13762 } 13763 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 13764 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 13765 ? 0 : getHorizontalScrollbarHeight(); 13766 } 13767 } 13768 13769 if (mPaddingLeft != left) { 13770 changed = true; 13771 mPaddingLeft = left; 13772 } 13773 if (mPaddingTop != top) { 13774 changed = true; 13775 mPaddingTop = top; 13776 } 13777 if (mPaddingRight != right) { 13778 changed = true; 13779 mPaddingRight = right; 13780 } 13781 if (mPaddingBottom != bottom) { 13782 changed = true; 13783 mPaddingBottom = bottom; 13784 } 13785 13786 if (changed) { 13787 requestLayout(); 13788 } 13789 } 13790 13791 /** 13792 * Sets the relative padding. The view may add on the space required to display 13793 * the scrollbars, depending on the style and visibility of the scrollbars. 13794 * So the values returned from {@link #getPaddingStart}, {@link #getPaddingTop}, 13795 * {@link #getPaddingEnd} and {@link #getPaddingBottom} may be different 13796 * from the values set in this call. 13797 * 13798 * @attr ref android.R.styleable#View_padding 13799 * @attr ref android.R.styleable#View_paddingBottom 13800 * @attr ref android.R.styleable#View_paddingStart 13801 * @attr ref android.R.styleable#View_paddingEnd 13802 * @attr ref android.R.styleable#View_paddingTop 13803 * @param start the start padding in pixels 13804 * @param top the top padding in pixels 13805 * @param end the end padding in pixels 13806 * @param bottom the bottom padding in pixels 13807 */ 13808 public void setPaddingRelative(int start, int top, int end, int bottom) { 13809 mUserPaddingStart = start; 13810 mUserPaddingEnd = end; 13811 mUserPaddingRelative = true; 13812 13813 switch(getResolvedLayoutDirection()) { 13814 case LAYOUT_DIRECTION_RTL: 13815 internalSetPadding(end, top, start, bottom); 13816 break; 13817 case LAYOUT_DIRECTION_LTR: 13818 default: 13819 internalSetPadding(start, top, end, bottom); 13820 } 13821 } 13822 13823 /** 13824 * Returns the top padding of this view. 13825 * 13826 * @return the top padding in pixels 13827 */ 13828 public int getPaddingTop() { 13829 return mPaddingTop; 13830 } 13831 13832 /** 13833 * Returns the bottom padding of this view. If there are inset and enabled 13834 * scrollbars, this value may include the space required to display the 13835 * scrollbars as well. 13836 * 13837 * @return the bottom padding in pixels 13838 */ 13839 public int getPaddingBottom() { 13840 return mPaddingBottom; 13841 } 13842 13843 /** 13844 * Returns the left padding of this view. If there are inset and enabled 13845 * scrollbars, this value may include the space required to display the 13846 * scrollbars as well. 13847 * 13848 * @return the left padding in pixels 13849 */ 13850 public int getPaddingLeft() { 13851 return mPaddingLeft; 13852 } 13853 13854 /** 13855 * Returns the start padding of this view depending on its resolved layout direction. 13856 * If there are inset and enabled scrollbars, this value may include the space 13857 * required to display the scrollbars as well. 13858 * 13859 * @return the start padding in pixels 13860 */ 13861 public int getPaddingStart() { 13862 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 13863 mPaddingRight : mPaddingLeft; 13864 } 13865 13866 /** 13867 * Returns the right 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 right padding in pixels 13872 */ 13873 public int getPaddingRight() { 13874 return mPaddingRight; 13875 } 13876 13877 /** 13878 * Returns the end 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 end padding in pixels 13883 */ 13884 public int getPaddingEnd() { 13885 return (getResolvedLayoutDirection() == LAYOUT_DIRECTION_RTL) ? 13886 mPaddingLeft : mPaddingRight; 13887 } 13888 13889 /** 13890 * Return if the padding as been set thru relative values 13891 * {@link #setPaddingRelative(int, int, int, int)} or thru 13892 * @attr ref android.R.styleable#View_paddingStart or 13893 * @attr ref android.R.styleable#View_paddingEnd 13894 * 13895 * @return true if the padding is relative or false if it is not. 13896 */ 13897 public boolean isPaddingRelative() { 13898 return mUserPaddingRelative; 13899 } 13900 13901 /** 13902 * @hide 13903 */ 13904 public Insets getOpticalInsets() { 13905 if (mLayoutInsets == null) { 13906 mLayoutInsets = (mBackground == null) ? Insets.NONE : mBackground.getLayoutInsets(); 13907 } 13908 return mLayoutInsets; 13909 } 13910 13911 /** 13912 * @hide 13913 */ 13914 public void setLayoutInsets(Insets layoutInsets) { 13915 mLayoutInsets = layoutInsets; 13916 } 13917 13918 /** 13919 * Changes the selection state of this view. A view can be selected or not. 13920 * Note that selection is not the same as focus. Views are typically 13921 * selected in the context of an AdapterView like ListView or GridView; 13922 * the selected view is the view that is highlighted. 13923 * 13924 * @param selected true if the view must be selected, false otherwise 13925 */ 13926 public void setSelected(boolean selected) { 13927 if (((mPrivateFlags & SELECTED) != 0) != selected) { 13928 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 13929 if (!selected) resetPressedState(); 13930 invalidate(true); 13931 refreshDrawableState(); 13932 dispatchSetSelected(selected); 13933 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 13934 notifyAccessibilityStateChanged(); 13935 } 13936 } 13937 } 13938 13939 /** 13940 * Dispatch setSelected to all of this View's children. 13941 * 13942 * @see #setSelected(boolean) 13943 * 13944 * @param selected The new selected state 13945 */ 13946 protected void dispatchSetSelected(boolean selected) { 13947 } 13948 13949 /** 13950 * Indicates the selection state of this view. 13951 * 13952 * @return true if the view is selected, false otherwise 13953 */ 13954 @ViewDebug.ExportedProperty 13955 public boolean isSelected() { 13956 return (mPrivateFlags & SELECTED) != 0; 13957 } 13958 13959 /** 13960 * Changes the activated state of this view. A view can be activated or not. 13961 * Note that activation is not the same as selection. Selection is 13962 * a transient property, representing the view (hierarchy) the user is 13963 * currently interacting with. Activation is a longer-term state that the 13964 * user can move views in and out of. For example, in a list view with 13965 * single or multiple selection enabled, the views in the current selection 13966 * set are activated. (Um, yeah, we are deeply sorry about the terminology 13967 * here.) The activated state is propagated down to children of the view it 13968 * is set on. 13969 * 13970 * @param activated true if the view must be activated, false otherwise 13971 */ 13972 public void setActivated(boolean activated) { 13973 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 13974 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 13975 invalidate(true); 13976 refreshDrawableState(); 13977 dispatchSetActivated(activated); 13978 } 13979 } 13980 13981 /** 13982 * Dispatch setActivated to all of this View's children. 13983 * 13984 * @see #setActivated(boolean) 13985 * 13986 * @param activated The new activated state 13987 */ 13988 protected void dispatchSetActivated(boolean activated) { 13989 } 13990 13991 /** 13992 * Indicates the activation state of this view. 13993 * 13994 * @return true if the view is activated, false otherwise 13995 */ 13996 @ViewDebug.ExportedProperty 13997 public boolean isActivated() { 13998 return (mPrivateFlags & ACTIVATED) != 0; 13999 } 14000 14001 /** 14002 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 14003 * observer can be used to get notifications when global events, like 14004 * layout, happen. 14005 * 14006 * The returned ViewTreeObserver observer is not guaranteed to remain 14007 * valid for the lifetime of this View. If the caller of this method keeps 14008 * a long-lived reference to ViewTreeObserver, it should always check for 14009 * the return value of {@link ViewTreeObserver#isAlive()}. 14010 * 14011 * @return The ViewTreeObserver for this view's hierarchy. 14012 */ 14013 public ViewTreeObserver getViewTreeObserver() { 14014 if (mAttachInfo != null) { 14015 return mAttachInfo.mTreeObserver; 14016 } 14017 if (mFloatingTreeObserver == null) { 14018 mFloatingTreeObserver = new ViewTreeObserver(); 14019 } 14020 return mFloatingTreeObserver; 14021 } 14022 14023 /** 14024 * <p>Finds the topmost view in the current view hierarchy.</p> 14025 * 14026 * @return the topmost view containing this view 14027 */ 14028 public View getRootView() { 14029 if (mAttachInfo != null) { 14030 final View v = mAttachInfo.mRootView; 14031 if (v != null) { 14032 return v; 14033 } 14034 } 14035 14036 View parent = this; 14037 14038 while (parent.mParent != null && parent.mParent instanceof View) { 14039 parent = (View) parent.mParent; 14040 } 14041 14042 return parent; 14043 } 14044 14045 /** 14046 * <p>Computes the coordinates of this view on the screen. The argument 14047 * must be an array of two integers. After the method returns, the array 14048 * contains the x and y location in that order.</p> 14049 * 14050 * @param location an array of two integers in which to hold the coordinates 14051 */ 14052 public void getLocationOnScreen(int[] location) { 14053 getLocationInWindow(location); 14054 14055 final AttachInfo info = mAttachInfo; 14056 if (info != null) { 14057 location[0] += info.mWindowLeft; 14058 location[1] += info.mWindowTop; 14059 } 14060 } 14061 14062 /** 14063 * <p>Computes the coordinates of this view in its window. The argument 14064 * must be an array of two integers. After the method returns, the array 14065 * contains the x and y location in that order.</p> 14066 * 14067 * @param location an array of two integers in which to hold the coordinates 14068 */ 14069 public void getLocationInWindow(int[] location) { 14070 if (location == null || location.length < 2) { 14071 throw new IllegalArgumentException("location must be an array of two integers"); 14072 } 14073 14074 if (mAttachInfo == null) { 14075 // When the view is not attached to a window, this method does not make sense 14076 location[0] = location[1] = 0; 14077 return; 14078 } 14079 14080 float[] position = mAttachInfo.mTmpTransformLocation; 14081 position[0] = position[1] = 0.0f; 14082 14083 if (!hasIdentityMatrix()) { 14084 getMatrix().mapPoints(position); 14085 } 14086 14087 position[0] += mLeft; 14088 position[1] += mTop; 14089 14090 ViewParent viewParent = mParent; 14091 while (viewParent instanceof View) { 14092 final View view = (View) viewParent; 14093 14094 position[0] -= view.mScrollX; 14095 position[1] -= view.mScrollY; 14096 14097 if (!view.hasIdentityMatrix()) { 14098 view.getMatrix().mapPoints(position); 14099 } 14100 14101 position[0] += view.mLeft; 14102 position[1] += view.mTop; 14103 14104 viewParent = view.mParent; 14105 } 14106 14107 if (viewParent instanceof ViewRootImpl) { 14108 // *cough* 14109 final ViewRootImpl vr = (ViewRootImpl) viewParent; 14110 position[1] -= vr.mCurScrollY; 14111 } 14112 14113 location[0] = (int) (position[0] + 0.5f); 14114 location[1] = (int) (position[1] + 0.5f); 14115 } 14116 14117 /** 14118 * {@hide} 14119 * @param id the id of the view to be found 14120 * @return the view of the specified id, null if cannot be found 14121 */ 14122 protected View findViewTraversal(int id) { 14123 if (id == mID) { 14124 return this; 14125 } 14126 return null; 14127 } 14128 14129 /** 14130 * {@hide} 14131 * @param tag the tag of the view to be found 14132 * @return the view of specified tag, null if cannot be found 14133 */ 14134 protected View findViewWithTagTraversal(Object tag) { 14135 if (tag != null && tag.equals(mTag)) { 14136 return this; 14137 } 14138 return null; 14139 } 14140 14141 /** 14142 * {@hide} 14143 * @param predicate The predicate to evaluate. 14144 * @param childToSkip If not null, ignores this child during the recursive traversal. 14145 * @return The first view that matches the predicate or null. 14146 */ 14147 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 14148 if (predicate.apply(this)) { 14149 return this; 14150 } 14151 return null; 14152 } 14153 14154 /** 14155 * Look for a child view with the given id. If this view has the given 14156 * id, return this view. 14157 * 14158 * @param id The id to search for. 14159 * @return The view that has the given id in the hierarchy or null 14160 */ 14161 public final View findViewById(int id) { 14162 if (id < 0) { 14163 return null; 14164 } 14165 return findViewTraversal(id); 14166 } 14167 14168 /** 14169 * Finds a view by its unuque and stable accessibility id. 14170 * 14171 * @param accessibilityId The searched accessibility id. 14172 * @return The found view. 14173 */ 14174 final View findViewByAccessibilityId(int accessibilityId) { 14175 if (accessibilityId < 0) { 14176 return null; 14177 } 14178 return findViewByAccessibilityIdTraversal(accessibilityId); 14179 } 14180 14181 /** 14182 * Performs the traversal to find a view by its unuque and stable accessibility id. 14183 * 14184 * <strong>Note:</strong>This method does not stop at the root namespace 14185 * boundary since the user can touch the screen at an arbitrary location 14186 * potentially crossing the root namespace bounday which will send an 14187 * accessibility event to accessibility services and they should be able 14188 * to obtain the event source. Also accessibility ids are guaranteed to be 14189 * unique in the window. 14190 * 14191 * @param accessibilityId The accessibility id. 14192 * @return The found view. 14193 */ 14194 View findViewByAccessibilityIdTraversal(int accessibilityId) { 14195 if (getAccessibilityViewId() == accessibilityId) { 14196 return this; 14197 } 14198 return null; 14199 } 14200 14201 /** 14202 * Look for a child view with the given tag. If this view has the given 14203 * tag, return this view. 14204 * 14205 * @param tag The tag to search for, using "tag.equals(getTag())". 14206 * @return The View that has the given tag in the hierarchy or null 14207 */ 14208 public final View findViewWithTag(Object tag) { 14209 if (tag == null) { 14210 return null; 14211 } 14212 return findViewWithTagTraversal(tag); 14213 } 14214 14215 /** 14216 * {@hide} 14217 * Look for a child view that matches the specified predicate. 14218 * If this view matches the predicate, return this view. 14219 * 14220 * @param predicate The predicate to evaluate. 14221 * @return The first view that matches the predicate or null. 14222 */ 14223 public final View findViewByPredicate(Predicate<View> predicate) { 14224 return findViewByPredicateTraversal(predicate, null); 14225 } 14226 14227 /** 14228 * {@hide} 14229 * Look for a child view that matches the specified predicate, 14230 * starting with the specified view and its descendents and then 14231 * recusively searching the ancestors and siblings of that view 14232 * until this view is reached. 14233 * 14234 * This method is useful in cases where the predicate does not match 14235 * a single unique view (perhaps multiple views use the same id) 14236 * and we are trying to find the view that is "closest" in scope to the 14237 * starting view. 14238 * 14239 * @param start The view to start from. 14240 * @param predicate The predicate to evaluate. 14241 * @return The first view that matches the predicate or null. 14242 */ 14243 public final View findViewByPredicateInsideOut(View start, Predicate<View> predicate) { 14244 View childToSkip = null; 14245 for (;;) { 14246 View view = start.findViewByPredicateTraversal(predicate, childToSkip); 14247 if (view != null || start == this) { 14248 return view; 14249 } 14250 14251 ViewParent parent = start.getParent(); 14252 if (parent == null || !(parent instanceof View)) { 14253 return null; 14254 } 14255 14256 childToSkip = start; 14257 start = (View) parent; 14258 } 14259 } 14260 14261 /** 14262 * Sets the identifier for this view. The identifier does not have to be 14263 * unique in this view's hierarchy. The identifier should be a positive 14264 * number. 14265 * 14266 * @see #NO_ID 14267 * @see #getId() 14268 * @see #findViewById(int) 14269 * 14270 * @param id a number used to identify the view 14271 * 14272 * @attr ref android.R.styleable#View_id 14273 */ 14274 public void setId(int id) { 14275 mID = id; 14276 } 14277 14278 /** 14279 * {@hide} 14280 * 14281 * @param isRoot true if the view belongs to the root namespace, false 14282 * otherwise 14283 */ 14284 public void setIsRootNamespace(boolean isRoot) { 14285 if (isRoot) { 14286 mPrivateFlags |= IS_ROOT_NAMESPACE; 14287 } else { 14288 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 14289 } 14290 } 14291 14292 /** 14293 * {@hide} 14294 * 14295 * @return true if the view belongs to the root namespace, false otherwise 14296 */ 14297 public boolean isRootNamespace() { 14298 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 14299 } 14300 14301 /** 14302 * Returns this view's identifier. 14303 * 14304 * @return a positive integer used to identify the view or {@link #NO_ID} 14305 * if the view has no ID 14306 * 14307 * @see #setId(int) 14308 * @see #findViewById(int) 14309 * @attr ref android.R.styleable#View_id 14310 */ 14311 @ViewDebug.CapturedViewProperty 14312 public int getId() { 14313 return mID; 14314 } 14315 14316 /** 14317 * Returns this view's tag. 14318 * 14319 * @return the Object stored in this view as a tag 14320 * 14321 * @see #setTag(Object) 14322 * @see #getTag(int) 14323 */ 14324 @ViewDebug.ExportedProperty 14325 public Object getTag() { 14326 return mTag; 14327 } 14328 14329 /** 14330 * Sets the tag associated with this view. A tag can be used to mark 14331 * a view in its hierarchy and does not have to be unique within the 14332 * hierarchy. Tags can also be used to store data within a view without 14333 * resorting to another data structure. 14334 * 14335 * @param tag an Object to tag the view with 14336 * 14337 * @see #getTag() 14338 * @see #setTag(int, Object) 14339 */ 14340 public void setTag(final Object tag) { 14341 mTag = tag; 14342 } 14343 14344 /** 14345 * Returns the tag associated with this view and the specified key. 14346 * 14347 * @param key The key identifying the tag 14348 * 14349 * @return the Object stored in this view as a tag 14350 * 14351 * @see #setTag(int, Object) 14352 * @see #getTag() 14353 */ 14354 public Object getTag(int key) { 14355 if (mKeyedTags != null) return mKeyedTags.get(key); 14356 return null; 14357 } 14358 14359 /** 14360 * Sets a tag associated with this view and a key. A tag can be used 14361 * to mark a view in its hierarchy and does not have to be unique within 14362 * the hierarchy. Tags can also be used to store data within a view 14363 * without resorting to another data structure. 14364 * 14365 * The specified key should be an id declared in the resources of the 14366 * application to ensure it is unique (see the <a 14367 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 14368 * Keys identified as belonging to 14369 * the Android framework or not associated with any package will cause 14370 * an {@link IllegalArgumentException} to be thrown. 14371 * 14372 * @param key The key identifying the tag 14373 * @param tag An Object to tag the view with 14374 * 14375 * @throws IllegalArgumentException If they specified key is not valid 14376 * 14377 * @see #setTag(Object) 14378 * @see #getTag(int) 14379 */ 14380 public void setTag(int key, final Object tag) { 14381 // If the package id is 0x00 or 0x01, it's either an undefined package 14382 // or a framework id 14383 if ((key >>> 24) < 2) { 14384 throw new IllegalArgumentException("The key must be an application-specific " 14385 + "resource id."); 14386 } 14387 14388 setKeyedTag(key, tag); 14389 } 14390 14391 /** 14392 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 14393 * framework id. 14394 * 14395 * @hide 14396 */ 14397 public void setTagInternal(int key, Object tag) { 14398 if ((key >>> 24) != 0x1) { 14399 throw new IllegalArgumentException("The key must be a framework-specific " 14400 + "resource id."); 14401 } 14402 14403 setKeyedTag(key, tag); 14404 } 14405 14406 private void setKeyedTag(int key, Object tag) { 14407 if (mKeyedTags == null) { 14408 mKeyedTags = new SparseArray<Object>(); 14409 } 14410 14411 mKeyedTags.put(key, tag); 14412 } 14413 14414 /** 14415 * @param consistency The type of consistency. See ViewDebug for more information. 14416 * 14417 * @hide 14418 */ 14419 protected boolean dispatchConsistencyCheck(int consistency) { 14420 return onConsistencyCheck(consistency); 14421 } 14422 14423 /** 14424 * Method that subclasses should implement to check their consistency. The type of 14425 * consistency check is indicated by the bit field passed as a parameter. 14426 * 14427 * @param consistency The type of consistency. See ViewDebug for more information. 14428 * 14429 * @throws IllegalStateException if the view is in an inconsistent state. 14430 * 14431 * @hide 14432 */ 14433 protected boolean onConsistencyCheck(int consistency) { 14434 boolean result = true; 14435 14436 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 14437 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 14438 14439 if (checkLayout) { 14440 if (getParent() == null) { 14441 result = false; 14442 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14443 "View " + this + " does not have a parent."); 14444 } 14445 14446 if (mAttachInfo == null) { 14447 result = false; 14448 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14449 "View " + this + " is not attached to a window."); 14450 } 14451 } 14452 14453 if (checkDrawing) { 14454 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 14455 // from their draw() method 14456 14457 if ((mPrivateFlags & DRAWN) != DRAWN && 14458 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 14459 result = false; 14460 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 14461 "View " + this + " was invalidated but its drawing cache is valid."); 14462 } 14463 } 14464 14465 return result; 14466 } 14467 14468 /** 14469 * Prints information about this view in the log output, with the tag 14470 * {@link #VIEW_LOG_TAG}. 14471 * 14472 * @hide 14473 */ 14474 public void debug() { 14475 debug(0); 14476 } 14477 14478 /** 14479 * Prints information about this view in the log output, with the tag 14480 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 14481 * indentation defined by the <code>depth</code>. 14482 * 14483 * @param depth the indentation level 14484 * 14485 * @hide 14486 */ 14487 protected void debug(int depth) { 14488 String output = debugIndent(depth - 1); 14489 14490 output += "+ " + this; 14491 int id = getId(); 14492 if (id != -1) { 14493 output += " (id=" + id + ")"; 14494 } 14495 Object tag = getTag(); 14496 if (tag != null) { 14497 output += " (tag=" + tag + ")"; 14498 } 14499 Log.d(VIEW_LOG_TAG, output); 14500 14501 if ((mPrivateFlags & FOCUSED) != 0) { 14502 output = debugIndent(depth) + " FOCUSED"; 14503 Log.d(VIEW_LOG_TAG, output); 14504 } 14505 14506 output = debugIndent(depth); 14507 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 14508 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 14509 + "} "; 14510 Log.d(VIEW_LOG_TAG, output); 14511 14512 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 14513 || mPaddingBottom != 0) { 14514 output = debugIndent(depth); 14515 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 14516 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 14517 Log.d(VIEW_LOG_TAG, output); 14518 } 14519 14520 output = debugIndent(depth); 14521 output += "mMeasureWidth=" + mMeasuredWidth + 14522 " mMeasureHeight=" + mMeasuredHeight; 14523 Log.d(VIEW_LOG_TAG, output); 14524 14525 output = debugIndent(depth); 14526 if (mLayoutParams == null) { 14527 output += "BAD! no layout params"; 14528 } else { 14529 output = mLayoutParams.debug(output); 14530 } 14531 Log.d(VIEW_LOG_TAG, output); 14532 14533 output = debugIndent(depth); 14534 output += "flags={"; 14535 output += View.printFlags(mViewFlags); 14536 output += "}"; 14537 Log.d(VIEW_LOG_TAG, output); 14538 14539 output = debugIndent(depth); 14540 output += "privateFlags={"; 14541 output += View.printPrivateFlags(mPrivateFlags); 14542 output += "}"; 14543 Log.d(VIEW_LOG_TAG, output); 14544 } 14545 14546 /** 14547 * Creates a string of whitespaces used for indentation. 14548 * 14549 * @param depth the indentation level 14550 * @return a String containing (depth * 2 + 3) * 2 white spaces 14551 * 14552 * @hide 14553 */ 14554 protected static String debugIndent(int depth) { 14555 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 14556 for (int i = 0; i < (depth * 2) + 3; i++) { 14557 spaces.append(' ').append(' '); 14558 } 14559 return spaces.toString(); 14560 } 14561 14562 /** 14563 * <p>Return the offset of the widget's text baseline from the widget's top 14564 * boundary. If this widget does not support baseline alignment, this 14565 * method returns -1. </p> 14566 * 14567 * @return the offset of the baseline within the widget's bounds or -1 14568 * if baseline alignment is not supported 14569 */ 14570 @ViewDebug.ExportedProperty(category = "layout") 14571 public int getBaseline() { 14572 return -1; 14573 } 14574 14575 /** 14576 * Call this when something has changed which has invalidated the 14577 * layout of this view. This will schedule a layout pass of the view 14578 * tree. 14579 */ 14580 public void requestLayout() { 14581 if (ViewDebug.TRACE_HIERARCHY) { 14582 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 14583 } 14584 14585 mPrivateFlags |= FORCE_LAYOUT; 14586 mPrivateFlags |= INVALIDATED; 14587 14588 if (mLayoutParams != null) { 14589 mLayoutParams.onResolveLayoutDirection(getResolvedLayoutDirection()); 14590 } 14591 14592 if (mParent != null && !mParent.isLayoutRequested()) { 14593 mParent.requestLayout(); 14594 } 14595 } 14596 14597 /** 14598 * Forces this view to be laid out during the next layout pass. 14599 * This method does not call requestLayout() or forceLayout() 14600 * on the parent. 14601 */ 14602 public void forceLayout() { 14603 mPrivateFlags |= FORCE_LAYOUT; 14604 mPrivateFlags |= INVALIDATED; 14605 } 14606 14607 /** 14608 * <p> 14609 * This is called to find out how big a view should be. The parent 14610 * supplies constraint information in the width and height parameters. 14611 * </p> 14612 * 14613 * <p> 14614 * The actual measurement work of a view is performed in 14615 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 14616 * {@link #onMeasure(int, int)} can and must be overridden by subclasses. 14617 * </p> 14618 * 14619 * 14620 * @param widthMeasureSpec Horizontal space requirements as imposed by the 14621 * parent 14622 * @param heightMeasureSpec Vertical space requirements as imposed by the 14623 * parent 14624 * 14625 * @see #onMeasure(int, int) 14626 */ 14627 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 14628 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 14629 widthMeasureSpec != mOldWidthMeasureSpec || 14630 heightMeasureSpec != mOldHeightMeasureSpec) { 14631 14632 // first clears the measured dimension flag 14633 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 14634 14635 if (ViewDebug.TRACE_HIERARCHY) { 14636 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 14637 } 14638 14639 // measure ourselves, this should set the measured dimension flag back 14640 onMeasure(widthMeasureSpec, heightMeasureSpec); 14641 14642 // flag not set, setMeasuredDimension() was not invoked, we raise 14643 // an exception to warn the developer 14644 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 14645 throw new IllegalStateException("onMeasure() did not set the" 14646 + " measured dimension by calling" 14647 + " setMeasuredDimension()"); 14648 } 14649 14650 mPrivateFlags |= LAYOUT_REQUIRED; 14651 } 14652 14653 mOldWidthMeasureSpec = widthMeasureSpec; 14654 mOldHeightMeasureSpec = heightMeasureSpec; 14655 } 14656 14657 /** 14658 * <p> 14659 * Measure the view and its content to determine the measured width and the 14660 * measured height. This method is invoked by {@link #measure(int, int)} and 14661 * should be overriden by subclasses to provide accurate and efficient 14662 * measurement of their contents. 14663 * </p> 14664 * 14665 * <p> 14666 * <strong>CONTRACT:</strong> When overriding this method, you 14667 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 14668 * measured width and height of this view. Failure to do so will trigger an 14669 * <code>IllegalStateException</code>, thrown by 14670 * {@link #measure(int, int)}. Calling the superclass' 14671 * {@link #onMeasure(int, int)} is a valid use. 14672 * </p> 14673 * 14674 * <p> 14675 * The base class implementation of measure defaults to the background size, 14676 * unless a larger size is allowed by the MeasureSpec. Subclasses should 14677 * override {@link #onMeasure(int, int)} to provide better measurements of 14678 * their content. 14679 * </p> 14680 * 14681 * <p> 14682 * If this method is overridden, it is the subclass's responsibility to make 14683 * sure the measured height and width are at least the view's minimum height 14684 * and width ({@link #getSuggestedMinimumHeight()} and 14685 * {@link #getSuggestedMinimumWidth()}). 14686 * </p> 14687 * 14688 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 14689 * The requirements are encoded with 14690 * {@link android.view.View.MeasureSpec}. 14691 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 14692 * The requirements are encoded with 14693 * {@link android.view.View.MeasureSpec}. 14694 * 14695 * @see #getMeasuredWidth() 14696 * @see #getMeasuredHeight() 14697 * @see #setMeasuredDimension(int, int) 14698 * @see #getSuggestedMinimumHeight() 14699 * @see #getSuggestedMinimumWidth() 14700 * @see android.view.View.MeasureSpec#getMode(int) 14701 * @see android.view.View.MeasureSpec#getSize(int) 14702 */ 14703 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 14704 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 14705 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 14706 } 14707 14708 /** 14709 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 14710 * measured width and measured height. Failing to do so will trigger an 14711 * exception at measurement time.</p> 14712 * 14713 * @param measuredWidth The measured width of this view. May be a complex 14714 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 14715 * {@link #MEASURED_STATE_TOO_SMALL}. 14716 * @param measuredHeight The measured height of this view. May be a complex 14717 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 14718 * {@link #MEASURED_STATE_TOO_SMALL}. 14719 */ 14720 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 14721 mMeasuredWidth = measuredWidth; 14722 mMeasuredHeight = measuredHeight; 14723 14724 mPrivateFlags |= MEASURED_DIMENSION_SET; 14725 } 14726 14727 /** 14728 * Merge two states as returned by {@link #getMeasuredState()}. 14729 * @param curState The current state as returned from a view or the result 14730 * of combining multiple views. 14731 * @param newState The new view state to combine. 14732 * @return Returns a new integer reflecting the combination of the two 14733 * states. 14734 */ 14735 public static int combineMeasuredStates(int curState, int newState) { 14736 return curState | newState; 14737 } 14738 14739 /** 14740 * Version of {@link #resolveSizeAndState(int, int, int)} 14741 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 14742 */ 14743 public static int resolveSize(int size, int measureSpec) { 14744 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 14745 } 14746 14747 /** 14748 * Utility to reconcile a desired size and state, with constraints imposed 14749 * by a MeasureSpec. Will take the desired size, unless a different size 14750 * is imposed by the constraints. The returned value is a compound integer, 14751 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 14752 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 14753 * size is smaller than the size the view wants to be. 14754 * 14755 * @param size How big the view wants to be 14756 * @param measureSpec Constraints imposed by the parent 14757 * @return Size information bit mask as defined by 14758 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 14759 */ 14760 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 14761 int result = size; 14762 int specMode = MeasureSpec.getMode(measureSpec); 14763 int specSize = MeasureSpec.getSize(measureSpec); 14764 switch (specMode) { 14765 case MeasureSpec.UNSPECIFIED: 14766 result = size; 14767 break; 14768 case MeasureSpec.AT_MOST: 14769 if (specSize < size) { 14770 result = specSize | MEASURED_STATE_TOO_SMALL; 14771 } else { 14772 result = size; 14773 } 14774 break; 14775 case MeasureSpec.EXACTLY: 14776 result = specSize; 14777 break; 14778 } 14779 return result | (childMeasuredState&MEASURED_STATE_MASK); 14780 } 14781 14782 /** 14783 * Utility to return a default size. Uses the supplied size if the 14784 * MeasureSpec imposed no constraints. Will get larger if allowed 14785 * by the MeasureSpec. 14786 * 14787 * @param size Default size for this view 14788 * @param measureSpec Constraints imposed by the parent 14789 * @return The size this view should be. 14790 */ 14791 public static int getDefaultSize(int size, int measureSpec) { 14792 int result = size; 14793 int specMode = MeasureSpec.getMode(measureSpec); 14794 int specSize = MeasureSpec.getSize(measureSpec); 14795 14796 switch (specMode) { 14797 case MeasureSpec.UNSPECIFIED: 14798 result = size; 14799 break; 14800 case MeasureSpec.AT_MOST: 14801 case MeasureSpec.EXACTLY: 14802 result = specSize; 14803 break; 14804 } 14805 return result; 14806 } 14807 14808 /** 14809 * Returns the suggested minimum height that the view should use. This 14810 * returns the maximum of the view's minimum height 14811 * and the background's minimum height 14812 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 14813 * <p> 14814 * When being used in {@link #onMeasure(int, int)}, the caller should still 14815 * ensure the returned height is within the requirements of the parent. 14816 * 14817 * @return The suggested minimum height of the view. 14818 */ 14819 protected int getSuggestedMinimumHeight() { 14820 return (mBackground == null) ? mMinHeight : max(mMinHeight, mBackground.getMinimumHeight()); 14821 14822 } 14823 14824 /** 14825 * Returns the suggested minimum width that the view should use. This 14826 * returns the maximum of the view's minimum width) 14827 * and the background's minimum width 14828 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 14829 * <p> 14830 * When being used in {@link #onMeasure(int, int)}, the caller should still 14831 * ensure the returned width is within the requirements of the parent. 14832 * 14833 * @return The suggested minimum width of the view. 14834 */ 14835 protected int getSuggestedMinimumWidth() { 14836 return (mBackground == null) ? mMinWidth : max(mMinWidth, mBackground.getMinimumWidth()); 14837 } 14838 14839 /** 14840 * Returns the minimum height of the view. 14841 * 14842 * @return the minimum height the view will try to be. 14843 * 14844 * @see #setMinimumHeight(int) 14845 * 14846 * @attr ref android.R.styleable#View_minHeight 14847 */ 14848 public int getMinimumHeight() { 14849 return mMinHeight; 14850 } 14851 14852 /** 14853 * Sets the minimum height of the view. It is not guaranteed the view will 14854 * be able to achieve this minimum height (for example, if its parent layout 14855 * constrains it with less available height). 14856 * 14857 * @param minHeight The minimum height the view will try to be. 14858 * 14859 * @see #getMinimumHeight() 14860 * 14861 * @attr ref android.R.styleable#View_minHeight 14862 */ 14863 public void setMinimumHeight(int minHeight) { 14864 mMinHeight = minHeight; 14865 requestLayout(); 14866 } 14867 14868 /** 14869 * Returns the minimum width of the view. 14870 * 14871 * @return the minimum width the view will try to be. 14872 * 14873 * @see #setMinimumWidth(int) 14874 * 14875 * @attr ref android.R.styleable#View_minWidth 14876 */ 14877 public int getMinimumWidth() { 14878 return mMinWidth; 14879 } 14880 14881 /** 14882 * Sets the minimum width of the view. It is not guaranteed the view will 14883 * be able to achieve this minimum width (for example, if its parent layout 14884 * constrains it with less available width). 14885 * 14886 * @param minWidth The minimum width the view will try to be. 14887 * 14888 * @see #getMinimumWidth() 14889 * 14890 * @attr ref android.R.styleable#View_minWidth 14891 */ 14892 public void setMinimumWidth(int minWidth) { 14893 mMinWidth = minWidth; 14894 requestLayout(); 14895 14896 } 14897 14898 /** 14899 * Get the animation currently associated with this view. 14900 * 14901 * @return The animation that is currently playing or 14902 * scheduled to play for this view. 14903 */ 14904 public Animation getAnimation() { 14905 return mCurrentAnimation; 14906 } 14907 14908 /** 14909 * Start the specified animation now. 14910 * 14911 * @param animation the animation to start now 14912 */ 14913 public void startAnimation(Animation animation) { 14914 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 14915 setAnimation(animation); 14916 invalidateParentCaches(); 14917 invalidate(true); 14918 } 14919 14920 /** 14921 * Cancels any animations for this view. 14922 */ 14923 public void clearAnimation() { 14924 if (mCurrentAnimation != null) { 14925 mCurrentAnimation.detach(); 14926 } 14927 mCurrentAnimation = null; 14928 invalidateParentIfNeeded(); 14929 } 14930 14931 /** 14932 * Sets the next animation to play for this view. 14933 * If you want the animation to play immediately, use 14934 * startAnimation. This method provides allows fine-grained 14935 * control over the start time and invalidation, but you 14936 * must make sure that 1) the animation has a start time set, and 14937 * 2) the view will be invalidated when the animation is supposed to 14938 * start. 14939 * 14940 * @param animation The next animation, or null. 14941 */ 14942 public void setAnimation(Animation animation) { 14943 mCurrentAnimation = animation; 14944 14945 if (animation != null) { 14946 // If the screen is off assume the animation start time is now instead of 14947 // the next frame we draw. Keeping the START_ON_FIRST_FRAME start time 14948 // would cause the animation to start when the screen turns back on 14949 if (mAttachInfo != null && !mAttachInfo.mScreenOn && 14950 animation.getStartTime() == Animation.START_ON_FIRST_FRAME) { 14951 animation.setStartTime(AnimationUtils.currentAnimationTimeMillis()); 14952 } 14953 animation.reset(); 14954 } 14955 } 14956 14957 /** 14958 * Invoked by a parent ViewGroup to notify the start of the animation 14959 * currently associated with this view. If you override this method, 14960 * always call super.onAnimationStart(); 14961 * 14962 * @see #setAnimation(android.view.animation.Animation) 14963 * @see #getAnimation() 14964 */ 14965 protected void onAnimationStart() { 14966 mPrivateFlags |= ANIMATION_STARTED; 14967 } 14968 14969 /** 14970 * Invoked by a parent ViewGroup to notify the end of the animation 14971 * currently associated with this view. If you override this method, 14972 * always call super.onAnimationEnd(); 14973 * 14974 * @see #setAnimation(android.view.animation.Animation) 14975 * @see #getAnimation() 14976 */ 14977 protected void onAnimationEnd() { 14978 mPrivateFlags &= ~ANIMATION_STARTED; 14979 } 14980 14981 /** 14982 * Invoked if there is a Transform that involves alpha. Subclass that can 14983 * draw themselves with the specified alpha should return true, and then 14984 * respect that alpha when their onDraw() is called. If this returns false 14985 * then the view may be redirected to draw into an offscreen buffer to 14986 * fulfill the request, which will look fine, but may be slower than if the 14987 * subclass handles it internally. The default implementation returns false. 14988 * 14989 * @param alpha The alpha (0..255) to apply to the view's drawing 14990 * @return true if the view can draw with the specified alpha. 14991 */ 14992 protected boolean onSetAlpha(int alpha) { 14993 return false; 14994 } 14995 14996 /** 14997 * This is used by the RootView to perform an optimization when 14998 * the view hierarchy contains one or several SurfaceView. 14999 * SurfaceView is always considered transparent, but its children are not, 15000 * therefore all View objects remove themselves from the global transparent 15001 * region (passed as a parameter to this function). 15002 * 15003 * @param region The transparent region for this ViewAncestor (window). 15004 * 15005 * @return Returns true if the effective visibility of the view at this 15006 * point is opaque, regardless of the transparent region; returns false 15007 * if it is possible for underlying windows to be seen behind the view. 15008 * 15009 * {@hide} 15010 */ 15011 public boolean gatherTransparentRegion(Region region) { 15012 final AttachInfo attachInfo = mAttachInfo; 15013 if (region != null && attachInfo != null) { 15014 final int pflags = mPrivateFlags; 15015 if ((pflags & SKIP_DRAW) == 0) { 15016 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 15017 // remove it from the transparent region. 15018 final int[] location = attachInfo.mTransparentLocation; 15019 getLocationInWindow(location); 15020 region.op(location[0], location[1], location[0] + mRight - mLeft, 15021 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 15022 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBackground != null) { 15023 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 15024 // exists, so we remove the background drawable's non-transparent 15025 // parts from this transparent region. 15026 applyDrawableToTransparentRegion(mBackground, region); 15027 } 15028 } 15029 return true; 15030 } 15031 15032 /** 15033 * Play a sound effect for this view. 15034 * 15035 * <p>The framework will play sound effects for some built in actions, such as 15036 * clicking, but you may wish to play these effects in your widget, 15037 * for instance, for internal navigation. 15038 * 15039 * <p>The sound effect will only be played if sound effects are enabled by the user, and 15040 * {@link #isSoundEffectsEnabled()} is true. 15041 * 15042 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 15043 */ 15044 public void playSoundEffect(int soundConstant) { 15045 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 15046 return; 15047 } 15048 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 15049 } 15050 15051 /** 15052 * BZZZTT!!1! 15053 * 15054 * <p>Provide haptic feedback to the user for this view. 15055 * 15056 * <p>The framework will provide haptic feedback for some built in actions, 15057 * such as long presses, but you may wish to provide feedback for your 15058 * own widget. 15059 * 15060 * <p>The feedback will only be performed if 15061 * {@link #isHapticFeedbackEnabled()} is true. 15062 * 15063 * @param feedbackConstant One of the constants defined in 15064 * {@link HapticFeedbackConstants} 15065 */ 15066 public boolean performHapticFeedback(int feedbackConstant) { 15067 return performHapticFeedback(feedbackConstant, 0); 15068 } 15069 15070 /** 15071 * BZZZTT!!1! 15072 * 15073 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 15074 * 15075 * @param feedbackConstant One of the constants defined in 15076 * {@link HapticFeedbackConstants} 15077 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 15078 */ 15079 public boolean performHapticFeedback(int feedbackConstant, int flags) { 15080 if (mAttachInfo == null) { 15081 return false; 15082 } 15083 //noinspection SimplifiableIfStatement 15084 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 15085 && !isHapticFeedbackEnabled()) { 15086 return false; 15087 } 15088 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 15089 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 15090 } 15091 15092 /** 15093 * Request that the visibility of the status bar or other screen/window 15094 * decorations be changed. 15095 * 15096 * <p>This method is used to put the over device UI into temporary modes 15097 * where the user's attention is focused more on the application content, 15098 * by dimming or hiding surrounding system affordances. This is typically 15099 * used in conjunction with {@link Window#FEATURE_ACTION_BAR_OVERLAY 15100 * Window.FEATURE_ACTION_BAR_OVERLAY}, allowing the applications content 15101 * to be placed behind the action bar (and with these flags other system 15102 * affordances) so that smooth transitions between hiding and showing them 15103 * can be done. 15104 * 15105 * <p>Two representative examples of the use of system UI visibility is 15106 * implementing a content browsing application (like a magazine reader) 15107 * and a video playing application. 15108 * 15109 * <p>The first code shows a typical implementation of a View in a content 15110 * browsing application. In this implementation, the application goes 15111 * into a content-oriented mode by hiding the status bar and action bar, 15112 * and putting the navigation elements into lights out mode. The user can 15113 * then interact with content while in this mode. Such an application should 15114 * provide an easy way for the user to toggle out of the mode (such as to 15115 * check information in the status bar or access notifications). In the 15116 * implementation here, this is done simply by tapping on the content. 15117 * 15118 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/ContentBrowserActivity.java 15119 * content} 15120 * 15121 * <p>This second code sample shows a typical implementation of a View 15122 * in a video playing application. In this situation, while the video is 15123 * playing the application would like to go into a complete full-screen mode, 15124 * to use as much of the display as possible for the video. When in this state 15125 * the user can not interact with the application; the system intercepts 15126 * touching on the screen to pop the UI out of full screen mode. 15127 * 15128 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/VideoPlayerActivity.java 15129 * content} 15130 * 15131 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15132 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15133 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15134 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15135 */ 15136 public void setSystemUiVisibility(int visibility) { 15137 if (visibility != mSystemUiVisibility) { 15138 mSystemUiVisibility = visibility; 15139 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15140 mParent.recomputeViewAttributes(this); 15141 } 15142 } 15143 } 15144 15145 /** 15146 * Returns the last {@link #setSystemUiVisibility(int) that this view has requested. 15147 * @return Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE}, 15148 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}, {@link #SYSTEM_UI_FLAG_FULLSCREEN}, 15149 * {@link #SYSTEM_UI_FLAG_LAYOUT_STABLE}, {@link #SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION}, 15150 * and {@link #SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN}. 15151 */ 15152 public int getSystemUiVisibility() { 15153 return mSystemUiVisibility; 15154 } 15155 15156 /** 15157 * Returns the current system UI visibility that is currently set for 15158 * the entire window. This is the combination of the 15159 * {@link #setSystemUiVisibility(int)} values supplied by all of the 15160 * views in the window. 15161 */ 15162 public int getWindowSystemUiVisibility() { 15163 return mAttachInfo != null ? mAttachInfo.mSystemUiVisibility : 0; 15164 } 15165 15166 /** 15167 * Override to find out when the window's requested system UI visibility 15168 * has changed, that is the value returned by {@link #getWindowSystemUiVisibility()}. 15169 * This is different from the callbacks recieved through 15170 * {@link #setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener)} 15171 * in that this is only telling you about the local request of the window, 15172 * not the actual values applied by the system. 15173 */ 15174 public void onWindowSystemUiVisibilityChanged(int visible) { 15175 } 15176 15177 /** 15178 * Dispatch callbacks to {@link #onWindowSystemUiVisibilityChanged(int)} down 15179 * the view hierarchy. 15180 */ 15181 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 15182 onWindowSystemUiVisibilityChanged(visible); 15183 } 15184 15185 /** 15186 * Set a listener to receive callbacks when the visibility of the system bar changes. 15187 * @param l The {@link OnSystemUiVisibilityChangeListener} to receive callbacks. 15188 */ 15189 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 15190 getListenerInfo().mOnSystemUiVisibilityChangeListener = l; 15191 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 15192 mParent.recomputeViewAttributes(this); 15193 } 15194 } 15195 15196 /** 15197 * Dispatch callbacks to {@link #setOnSystemUiVisibilityChangeListener} down 15198 * the view hierarchy. 15199 */ 15200 public void dispatchSystemUiVisibilityChanged(int visibility) { 15201 ListenerInfo li = mListenerInfo; 15202 if (li != null && li.mOnSystemUiVisibilityChangeListener != null) { 15203 li.mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 15204 visibility & PUBLIC_STATUS_BAR_VISIBILITY_MASK); 15205 } 15206 } 15207 15208 void updateLocalSystemUiVisibility(int localValue, int localChanges) { 15209 int val = (mSystemUiVisibility&~localChanges) | (localValue&localChanges); 15210 if (val != mSystemUiVisibility) { 15211 setSystemUiVisibility(val); 15212 } 15213 } 15214 15215 /** 15216 * Creates an image that the system displays during the drag and drop 15217 * operation. This is called a "drag shadow". The default implementation 15218 * for a DragShadowBuilder based on a View returns an image that has exactly the same 15219 * appearance as the given View. The default also positions the center of the drag shadow 15220 * directly under the touch point. If no View is provided (the constructor with no parameters 15221 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 15222 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 15223 * default is an invisible drag shadow. 15224 * <p> 15225 * You are not required to use the View you provide to the constructor as the basis of the 15226 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 15227 * anything you want as the drag shadow. 15228 * </p> 15229 * <p> 15230 * You pass a DragShadowBuilder object to the system when you start the drag. The system 15231 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 15232 * size and position of the drag shadow. It uses this data to construct a 15233 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 15234 * so that your application can draw the shadow image in the Canvas. 15235 * </p> 15236 * 15237 * <div class="special reference"> 15238 * <h3>Developer Guides</h3> 15239 * <p>For a guide to implementing drag and drop features, read the 15240 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 15241 * </div> 15242 */ 15243 public static class DragShadowBuilder { 15244 private final WeakReference<View> mView; 15245 15246 /** 15247 * Constructs a shadow image builder based on a View. By default, the resulting drag 15248 * shadow will have the same appearance and dimensions as the View, with the touch point 15249 * over the center of the View. 15250 * @param view A View. Any View in scope can be used. 15251 */ 15252 public DragShadowBuilder(View view) { 15253 mView = new WeakReference<View>(view); 15254 } 15255 15256 /** 15257 * Construct a shadow builder object with no associated View. This 15258 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 15259 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 15260 * to supply the drag shadow's dimensions and appearance without 15261 * reference to any View object. If they are not overridden, then the result is an 15262 * invisible drag shadow. 15263 */ 15264 public DragShadowBuilder() { 15265 mView = new WeakReference<View>(null); 15266 } 15267 15268 /** 15269 * Returns the View object that had been passed to the 15270 * {@link #View.DragShadowBuilder(View)} 15271 * constructor. If that View parameter was {@code null} or if the 15272 * {@link #View.DragShadowBuilder()} 15273 * constructor was used to instantiate the builder object, this method will return 15274 * null. 15275 * 15276 * @return The View object associate with this builder object. 15277 */ 15278 @SuppressWarnings({"JavadocReference"}) 15279 final public View getView() { 15280 return mView.get(); 15281 } 15282 15283 /** 15284 * Provides the metrics for the shadow image. These include the dimensions of 15285 * the shadow image, and the point within that shadow that should 15286 * be centered under the touch location while dragging. 15287 * <p> 15288 * The default implementation sets the dimensions of the shadow to be the 15289 * same as the dimensions of the View itself and centers the shadow under 15290 * the touch point. 15291 * </p> 15292 * 15293 * @param shadowSize A {@link android.graphics.Point} containing the width and height 15294 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 15295 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 15296 * image. 15297 * 15298 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 15299 * shadow image that should be underneath the touch point during the drag and drop 15300 * operation. Your application must set {@link android.graphics.Point#x} to the 15301 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 15302 */ 15303 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 15304 final View view = mView.get(); 15305 if (view != null) { 15306 shadowSize.set(view.getWidth(), view.getHeight()); 15307 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 15308 } else { 15309 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 15310 } 15311 } 15312 15313 /** 15314 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 15315 * based on the dimensions it received from the 15316 * {@link #onProvideShadowMetrics(Point, Point)} callback. 15317 * 15318 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 15319 */ 15320 public void onDrawShadow(Canvas canvas) { 15321 final View view = mView.get(); 15322 if (view != null) { 15323 view.draw(canvas); 15324 } else { 15325 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 15326 } 15327 } 15328 } 15329 15330 /** 15331 * Starts a drag and drop operation. When your application calls this method, it passes a 15332 * {@link android.view.View.DragShadowBuilder} object to the system. The 15333 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 15334 * to get metrics for the drag shadow, and then calls the object's 15335 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 15336 * <p> 15337 * Once the system has the drag shadow, it begins the drag and drop operation by sending 15338 * drag events to all the View objects in your application that are currently visible. It does 15339 * this either by calling the View object's drag listener (an implementation of 15340 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 15341 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 15342 * Both are passed a {@link android.view.DragEvent} object that has a 15343 * {@link android.view.DragEvent#getAction()} value of 15344 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 15345 * </p> 15346 * <p> 15347 * Your application can invoke startDrag() on any attached View object. The View object does not 15348 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 15349 * be related to the View the user selected for dragging. 15350 * </p> 15351 * @param data A {@link android.content.ClipData} object pointing to the data to be 15352 * transferred by the drag and drop operation. 15353 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 15354 * drag shadow. 15355 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 15356 * drop operation. This Object is put into every DragEvent object sent by the system during the 15357 * current drag. 15358 * <p> 15359 * myLocalState is a lightweight mechanism for the sending information from the dragged View 15360 * to the target Views. For example, it can contain flags that differentiate between a 15361 * a copy operation and a move operation. 15362 * </p> 15363 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 15364 * so the parameter should be set to 0. 15365 * @return {@code true} if the method completes successfully, or 15366 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 15367 * do a drag, and so no drag operation is in progress. 15368 */ 15369 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 15370 Object myLocalState, int flags) { 15371 if (ViewDebug.DEBUG_DRAG) { 15372 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 15373 } 15374 boolean okay = false; 15375 15376 Point shadowSize = new Point(); 15377 Point shadowTouchPoint = new Point(); 15378 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 15379 15380 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 15381 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 15382 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 15383 } 15384 15385 if (ViewDebug.DEBUG_DRAG) { 15386 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 15387 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 15388 } 15389 Surface surface = new Surface(); 15390 try { 15391 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 15392 flags, shadowSize.x, shadowSize.y, surface); 15393 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 15394 + " surface=" + surface); 15395 if (token != null) { 15396 Canvas canvas = surface.lockCanvas(null); 15397 try { 15398 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 15399 shadowBuilder.onDrawShadow(canvas); 15400 } finally { 15401 surface.unlockCanvasAndPost(canvas); 15402 } 15403 15404 final ViewRootImpl root = getViewRootImpl(); 15405 15406 // Cache the local state object for delivery with DragEvents 15407 root.setLocalDragState(myLocalState); 15408 15409 // repurpose 'shadowSize' for the last touch point 15410 root.getLastTouchPoint(shadowSize); 15411 15412 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 15413 shadowSize.x, shadowSize.y, 15414 shadowTouchPoint.x, shadowTouchPoint.y, data); 15415 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 15416 15417 // Off and running! Release our local surface instance; the drag 15418 // shadow surface is now managed by the system process. 15419 surface.release(); 15420 } 15421 } catch (Exception e) { 15422 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 15423 surface.destroy(); 15424 } 15425 15426 return okay; 15427 } 15428 15429 /** 15430 * Handles drag events sent by the system following a call to 15431 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 15432 *<p> 15433 * When the system calls this method, it passes a 15434 * {@link android.view.DragEvent} object. A call to 15435 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 15436 * in DragEvent. The method uses these to determine what is happening in the drag and drop 15437 * operation. 15438 * @param event The {@link android.view.DragEvent} sent by the system. 15439 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 15440 * in DragEvent, indicating the type of drag event represented by this object. 15441 * @return {@code true} if the method was successful, otherwise {@code false}. 15442 * <p> 15443 * The method should return {@code true} in response to an action type of 15444 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 15445 * operation. 15446 * </p> 15447 * <p> 15448 * The method should also return {@code true} in response to an action type of 15449 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 15450 * {@code false} if it didn't. 15451 * </p> 15452 */ 15453 public boolean onDragEvent(DragEvent event) { 15454 return false; 15455 } 15456 15457 /** 15458 * Detects if this View is enabled and has a drag event listener. 15459 * If both are true, then it calls the drag event listener with the 15460 * {@link android.view.DragEvent} it received. If the drag event listener returns 15461 * {@code true}, then dispatchDragEvent() returns {@code true}. 15462 * <p> 15463 * For all other cases, the method calls the 15464 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 15465 * method and returns its result. 15466 * </p> 15467 * <p> 15468 * This ensures that a drag event is always consumed, even if the View does not have a drag 15469 * event listener. However, if the View has a listener and the listener returns true, then 15470 * onDragEvent() is not called. 15471 * </p> 15472 */ 15473 public boolean dispatchDragEvent(DragEvent event) { 15474 //noinspection SimplifiableIfStatement 15475 ListenerInfo li = mListenerInfo; 15476 if (li != null && li.mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 15477 && li.mOnDragListener.onDrag(this, event)) { 15478 return true; 15479 } 15480 return onDragEvent(event); 15481 } 15482 15483 boolean canAcceptDrag() { 15484 return (mPrivateFlags2 & DRAG_CAN_ACCEPT) != 0; 15485 } 15486 15487 /** 15488 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 15489 * it is ever exposed at all. 15490 * @hide 15491 */ 15492 public void onCloseSystemDialogs(String reason) { 15493 } 15494 15495 /** 15496 * Given a Drawable whose bounds have been set to draw into this view, 15497 * update a Region being computed for 15498 * {@link #gatherTransparentRegion(android.graphics.Region)} so 15499 * that any non-transparent parts of the Drawable are removed from the 15500 * given transparent region. 15501 * 15502 * @param dr The Drawable whose transparency is to be applied to the region. 15503 * @param region A Region holding the current transparency information, 15504 * where any parts of the region that are set are considered to be 15505 * transparent. On return, this region will be modified to have the 15506 * transparency information reduced by the corresponding parts of the 15507 * Drawable that are not transparent. 15508 * {@hide} 15509 */ 15510 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 15511 if (DBG) { 15512 Log.i("View", "Getting transparent region for: " + this); 15513 } 15514 final Region r = dr.getTransparentRegion(); 15515 final Rect db = dr.getBounds(); 15516 final AttachInfo attachInfo = mAttachInfo; 15517 if (r != null && attachInfo != null) { 15518 final int w = getRight()-getLeft(); 15519 final int h = getBottom()-getTop(); 15520 if (db.left > 0) { 15521 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 15522 r.op(0, 0, db.left, h, Region.Op.UNION); 15523 } 15524 if (db.right < w) { 15525 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 15526 r.op(db.right, 0, w, h, Region.Op.UNION); 15527 } 15528 if (db.top > 0) { 15529 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 15530 r.op(0, 0, w, db.top, Region.Op.UNION); 15531 } 15532 if (db.bottom < h) { 15533 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 15534 r.op(0, db.bottom, w, h, Region.Op.UNION); 15535 } 15536 final int[] location = attachInfo.mTransparentLocation; 15537 getLocationInWindow(location); 15538 r.translate(location[0], location[1]); 15539 region.op(r, Region.Op.INTERSECT); 15540 } else { 15541 region.op(db, Region.Op.DIFFERENCE); 15542 } 15543 } 15544 15545 private void checkForLongClick(int delayOffset) { 15546 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 15547 mHasPerformedLongPress = false; 15548 15549 if (mPendingCheckForLongPress == null) { 15550 mPendingCheckForLongPress = new CheckForLongPress(); 15551 } 15552 mPendingCheckForLongPress.rememberWindowAttachCount(); 15553 postDelayed(mPendingCheckForLongPress, 15554 ViewConfiguration.getLongPressTimeout() - delayOffset); 15555 } 15556 } 15557 15558 /** 15559 * Inflate a view from an XML resource. This convenience method wraps the {@link 15560 * LayoutInflater} class, which provides a full range of options for view inflation. 15561 * 15562 * @param context The Context object for your activity or application. 15563 * @param resource The resource ID to inflate 15564 * @param root A view group that will be the parent. Used to properly inflate the 15565 * layout_* parameters. 15566 * @see LayoutInflater 15567 */ 15568 public static View inflate(Context context, int resource, ViewGroup root) { 15569 LayoutInflater factory = LayoutInflater.from(context); 15570 return factory.inflate(resource, root); 15571 } 15572 15573 /** 15574 * Scroll the view with standard behavior for scrolling beyond the normal 15575 * content boundaries. Views that call this method should override 15576 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 15577 * results of an over-scroll operation. 15578 * 15579 * Views can use this method to handle any touch or fling-based scrolling. 15580 * 15581 * @param deltaX Change in X in pixels 15582 * @param deltaY Change in Y in pixels 15583 * @param scrollX Current X scroll value in pixels before applying deltaX 15584 * @param scrollY Current Y scroll value in pixels before applying deltaY 15585 * @param scrollRangeX Maximum content scroll range along the X axis 15586 * @param scrollRangeY Maximum content scroll range along the Y axis 15587 * @param maxOverScrollX Number of pixels to overscroll by in either direction 15588 * along the X axis. 15589 * @param maxOverScrollY Number of pixels to overscroll by in either direction 15590 * along the Y axis. 15591 * @param isTouchEvent true if this scroll operation is the result of a touch event. 15592 * @return true if scrolling was clamped to an over-scroll boundary along either 15593 * axis, false otherwise. 15594 */ 15595 @SuppressWarnings({"UnusedParameters"}) 15596 protected boolean overScrollBy(int deltaX, int deltaY, 15597 int scrollX, int scrollY, 15598 int scrollRangeX, int scrollRangeY, 15599 int maxOverScrollX, int maxOverScrollY, 15600 boolean isTouchEvent) { 15601 final int overScrollMode = mOverScrollMode; 15602 final boolean canScrollHorizontal = 15603 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 15604 final boolean canScrollVertical = 15605 computeVerticalScrollRange() > computeVerticalScrollExtent(); 15606 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 15607 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 15608 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 15609 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 15610 15611 int newScrollX = scrollX + deltaX; 15612 if (!overScrollHorizontal) { 15613 maxOverScrollX = 0; 15614 } 15615 15616 int newScrollY = scrollY + deltaY; 15617 if (!overScrollVertical) { 15618 maxOverScrollY = 0; 15619 } 15620 15621 // Clamp values if at the limits and record 15622 final int left = -maxOverScrollX; 15623 final int right = maxOverScrollX + scrollRangeX; 15624 final int top = -maxOverScrollY; 15625 final int bottom = maxOverScrollY + scrollRangeY; 15626 15627 boolean clampedX = false; 15628 if (newScrollX > right) { 15629 newScrollX = right; 15630 clampedX = true; 15631 } else if (newScrollX < left) { 15632 newScrollX = left; 15633 clampedX = true; 15634 } 15635 15636 boolean clampedY = false; 15637 if (newScrollY > bottom) { 15638 newScrollY = bottom; 15639 clampedY = true; 15640 } else if (newScrollY < top) { 15641 newScrollY = top; 15642 clampedY = true; 15643 } 15644 15645 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 15646 15647 return clampedX || clampedY; 15648 } 15649 15650 /** 15651 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 15652 * respond to the results of an over-scroll operation. 15653 * 15654 * @param scrollX New X scroll value in pixels 15655 * @param scrollY New Y scroll value in pixels 15656 * @param clampedX True if scrollX was clamped to an over-scroll boundary 15657 * @param clampedY True if scrollY was clamped to an over-scroll boundary 15658 */ 15659 protected void onOverScrolled(int scrollX, int scrollY, 15660 boolean clampedX, boolean clampedY) { 15661 // Intentionally empty. 15662 } 15663 15664 /** 15665 * Returns the over-scroll mode for this view. The result will be 15666 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15667 * (allow over-scrolling only if the view content is larger than the container), 15668 * or {@link #OVER_SCROLL_NEVER}. 15669 * 15670 * @return This view's over-scroll mode. 15671 */ 15672 public int getOverScrollMode() { 15673 return mOverScrollMode; 15674 } 15675 15676 /** 15677 * Set the over-scroll mode for this view. Valid over-scroll modes are 15678 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 15679 * (allow over-scrolling only if the view content is larger than the container), 15680 * or {@link #OVER_SCROLL_NEVER}. 15681 * 15682 * Setting the over-scroll mode of a view will have an effect only if the 15683 * view is capable of scrolling. 15684 * 15685 * @param overScrollMode The new over-scroll mode for this view. 15686 */ 15687 public void setOverScrollMode(int overScrollMode) { 15688 if (overScrollMode != OVER_SCROLL_ALWAYS && 15689 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 15690 overScrollMode != OVER_SCROLL_NEVER) { 15691 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 15692 } 15693 mOverScrollMode = overScrollMode; 15694 } 15695 15696 /** 15697 * Gets a scale factor that determines the distance the view should scroll 15698 * vertically in response to {@link MotionEvent#ACTION_SCROLL}. 15699 * @return The vertical scroll scale factor. 15700 * @hide 15701 */ 15702 protected float getVerticalScrollFactor() { 15703 if (mVerticalScrollFactor == 0) { 15704 TypedValue outValue = new TypedValue(); 15705 if (!mContext.getTheme().resolveAttribute( 15706 com.android.internal.R.attr.listPreferredItemHeight, outValue, true)) { 15707 throw new IllegalStateException( 15708 "Expected theme to define listPreferredItemHeight."); 15709 } 15710 mVerticalScrollFactor = outValue.getDimension( 15711 mContext.getResources().getDisplayMetrics()); 15712 } 15713 return mVerticalScrollFactor; 15714 } 15715 15716 /** 15717 * Gets a scale factor that determines the distance the view should scroll 15718 * horizontally in response to {@link MotionEvent#ACTION_SCROLL}. 15719 * @return The horizontal scroll scale factor. 15720 * @hide 15721 */ 15722 protected float getHorizontalScrollFactor() { 15723 // TODO: Should use something else. 15724 return getVerticalScrollFactor(); 15725 } 15726 15727 /** 15728 * Return the value specifying the text direction or policy that was set with 15729 * {@link #setTextDirection(int)}. 15730 * 15731 * @return the defined text direction. It can be one of: 15732 * 15733 * {@link #TEXT_DIRECTION_INHERIT}, 15734 * {@link #TEXT_DIRECTION_FIRST_STRONG} 15735 * {@link #TEXT_DIRECTION_ANY_RTL}, 15736 * {@link #TEXT_DIRECTION_LTR}, 15737 * {@link #TEXT_DIRECTION_RTL}, 15738 * {@link #TEXT_DIRECTION_LOCALE} 15739 */ 15740 @ViewDebug.ExportedProperty(category = "text", mapping = { 15741 @ViewDebug.IntToString(from = TEXT_DIRECTION_INHERIT, to = "INHERIT"), 15742 @ViewDebug.IntToString(from = TEXT_DIRECTION_FIRST_STRONG, to = "FIRST_STRONG"), 15743 @ViewDebug.IntToString(from = TEXT_DIRECTION_ANY_RTL, to = "ANY_RTL"), 15744 @ViewDebug.IntToString(from = TEXT_DIRECTION_LTR, to = "LTR"), 15745 @ViewDebug.IntToString(from = TEXT_DIRECTION_RTL, to = "RTL"), 15746 @ViewDebug.IntToString(from = TEXT_DIRECTION_LOCALE, to = "LOCALE") 15747 }) 15748 public int getTextDirection() { 15749 return (mPrivateFlags2 & TEXT_DIRECTION_MASK) >> TEXT_DIRECTION_MASK_SHIFT; 15750 } 15751 15752 /** 15753 * Set the text direction. 15754 * 15755 * @param textDirection the direction to set. Should be one of: 15756 * 15757 * {@link #TEXT_DIRECTION_INHERIT}, 15758 * {@link #TEXT_DIRECTION_FIRST_STRONG} 15759 * {@link #TEXT_DIRECTION_ANY_RTL}, 15760 * {@link #TEXT_DIRECTION_LTR}, 15761 * {@link #TEXT_DIRECTION_RTL}, 15762 * {@link #TEXT_DIRECTION_LOCALE} 15763 */ 15764 public void setTextDirection(int textDirection) { 15765 if (getTextDirection() != textDirection) { 15766 // Reset the current text direction and the resolved one 15767 mPrivateFlags2 &= ~TEXT_DIRECTION_MASK; 15768 resetResolvedTextDirection(); 15769 // Set the new text direction 15770 mPrivateFlags2 |= ((textDirection << TEXT_DIRECTION_MASK_SHIFT) & TEXT_DIRECTION_MASK); 15771 // Refresh 15772 requestLayout(); 15773 invalidate(true); 15774 } 15775 } 15776 15777 /** 15778 * Return the resolved text direction. 15779 * 15780 * This needs resolution if the value is TEXT_DIRECTION_INHERIT. The resolution matches 15781 * {@link #getTextDirection()}if it is not TEXT_DIRECTION_INHERIT, otherwise resolution proceeds 15782 * up the parent chain of the view. if there is no parent, then it will return the default 15783 * {@link #TEXT_DIRECTION_FIRST_STRONG}. 15784 * 15785 * @return the resolved text direction. Returns one of: 15786 * 15787 * {@link #TEXT_DIRECTION_FIRST_STRONG} 15788 * {@link #TEXT_DIRECTION_ANY_RTL}, 15789 * {@link #TEXT_DIRECTION_LTR}, 15790 * {@link #TEXT_DIRECTION_RTL}, 15791 * {@link #TEXT_DIRECTION_LOCALE} 15792 */ 15793 public int getResolvedTextDirection() { 15794 // The text direction will be resolved only if needed 15795 if ((mPrivateFlags2 & TEXT_DIRECTION_RESOLVED) != TEXT_DIRECTION_RESOLVED) { 15796 resolveTextDirection(); 15797 } 15798 return (mPrivateFlags2 & TEXT_DIRECTION_RESOLVED_MASK) >> TEXT_DIRECTION_RESOLVED_MASK_SHIFT; 15799 } 15800 15801 /** 15802 * Resolve the text direction. Will call {@link View#onResolvedTextDirectionChanged} when 15803 * resolution is done. 15804 */ 15805 public void resolveTextDirection() { 15806 // Reset any previous text direction resolution 15807 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 15808 15809 if (hasRtlSupport()) { 15810 // Set resolved text direction flag depending on text direction flag 15811 final int textDirection = getTextDirection(); 15812 switch(textDirection) { 15813 case TEXT_DIRECTION_INHERIT: 15814 if (canResolveTextDirection()) { 15815 ViewGroup viewGroup = ((ViewGroup) mParent); 15816 15817 // Set current resolved direction to the same value as the parent's one 15818 final int parentResolvedDirection = viewGroup.getResolvedTextDirection(); 15819 switch (parentResolvedDirection) { 15820 case TEXT_DIRECTION_FIRST_STRONG: 15821 case TEXT_DIRECTION_ANY_RTL: 15822 case TEXT_DIRECTION_LTR: 15823 case TEXT_DIRECTION_RTL: 15824 case TEXT_DIRECTION_LOCALE: 15825 mPrivateFlags2 |= 15826 (parentResolvedDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 15827 break; 15828 default: 15829 // Default resolved direction is "first strong" heuristic 15830 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 15831 } 15832 } else { 15833 // We cannot do the resolution if there is no parent, so use the default one 15834 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 15835 } 15836 break; 15837 case TEXT_DIRECTION_FIRST_STRONG: 15838 case TEXT_DIRECTION_ANY_RTL: 15839 case TEXT_DIRECTION_LTR: 15840 case TEXT_DIRECTION_RTL: 15841 case TEXT_DIRECTION_LOCALE: 15842 // Resolved direction is the same as text direction 15843 mPrivateFlags2 |= (textDirection << TEXT_DIRECTION_RESOLVED_MASK_SHIFT); 15844 break; 15845 default: 15846 // Default resolved direction is "first strong" heuristic 15847 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 15848 } 15849 } else { 15850 // Default resolved direction is "first strong" heuristic 15851 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED_DEFAULT; 15852 } 15853 15854 // Set to resolved 15855 mPrivateFlags2 |= TEXT_DIRECTION_RESOLVED; 15856 onResolvedTextDirectionChanged(); 15857 } 15858 15859 /** 15860 * Called when text direction has been resolved. Subclasses that care about text direction 15861 * resolution should override this method. 15862 * 15863 * The default implementation does nothing. 15864 */ 15865 public void onResolvedTextDirectionChanged() { 15866 } 15867 15868 /** 15869 * Check if text direction resolution can be done. 15870 * 15871 * @return true if text direction resolution can be done otherwise return false. 15872 */ 15873 public boolean canResolveTextDirection() { 15874 switch (getTextDirection()) { 15875 case TEXT_DIRECTION_INHERIT: 15876 return (mParent != null) && (mParent instanceof ViewGroup); 15877 default: 15878 return true; 15879 } 15880 } 15881 15882 /** 15883 * Reset resolved text direction. Text direction can be resolved with a call to 15884 * getResolvedTextDirection(). Will call {@link View#onResolvedTextDirectionReset} when 15885 * reset is done. 15886 */ 15887 public void resetResolvedTextDirection() { 15888 mPrivateFlags2 &= ~(TEXT_DIRECTION_RESOLVED | TEXT_DIRECTION_RESOLVED_MASK); 15889 onResolvedTextDirectionReset(); 15890 } 15891 15892 /** 15893 * Called when text direction is reset. Subclasses that care about text direction reset should 15894 * override this method and do a reset of the text direction of their children. The default 15895 * implementation does nothing. 15896 */ 15897 public void onResolvedTextDirectionReset() { 15898 } 15899 15900 /** 15901 * Return the value specifying the text alignment or policy that was set with 15902 * {@link #setTextAlignment(int)}. 15903 * 15904 * @return the defined text alignment. It can be one of: 15905 * 15906 * {@link #TEXT_ALIGNMENT_INHERIT}, 15907 * {@link #TEXT_ALIGNMENT_GRAVITY}, 15908 * {@link #TEXT_ALIGNMENT_CENTER}, 15909 * {@link #TEXT_ALIGNMENT_TEXT_START}, 15910 * {@link #TEXT_ALIGNMENT_TEXT_END}, 15911 * {@link #TEXT_ALIGNMENT_VIEW_START}, 15912 * {@link #TEXT_ALIGNMENT_VIEW_END} 15913 */ 15914 @ViewDebug.ExportedProperty(category = "text", mapping = { 15915 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 15916 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 15917 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 15918 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 15919 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 15920 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 15921 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 15922 }) 15923 public int getTextAlignment() { 15924 return (mPrivateFlags2 & TEXT_ALIGNMENT_MASK) >> TEXT_ALIGNMENT_MASK_SHIFT; 15925 } 15926 15927 /** 15928 * Set the text alignment. 15929 * 15930 * @param textAlignment The text alignment to set. Should be one of 15931 * 15932 * {@link #TEXT_ALIGNMENT_INHERIT}, 15933 * {@link #TEXT_ALIGNMENT_GRAVITY}, 15934 * {@link #TEXT_ALIGNMENT_CENTER}, 15935 * {@link #TEXT_ALIGNMENT_TEXT_START}, 15936 * {@link #TEXT_ALIGNMENT_TEXT_END}, 15937 * {@link #TEXT_ALIGNMENT_VIEW_START}, 15938 * {@link #TEXT_ALIGNMENT_VIEW_END} 15939 * 15940 * @attr ref android.R.styleable#View_textAlignment 15941 */ 15942 public void setTextAlignment(int textAlignment) { 15943 if (textAlignment != getTextAlignment()) { 15944 // Reset the current and resolved text alignment 15945 mPrivateFlags2 &= ~TEXT_ALIGNMENT_MASK; 15946 resetResolvedTextAlignment(); 15947 // Set the new text alignment 15948 mPrivateFlags2 |= ((textAlignment << TEXT_ALIGNMENT_MASK_SHIFT) & TEXT_ALIGNMENT_MASK); 15949 // Refresh 15950 requestLayout(); 15951 invalidate(true); 15952 } 15953 } 15954 15955 /** 15956 * Return the resolved text alignment. 15957 * 15958 * The resolved text alignment. This needs resolution if the value is 15959 * TEXT_ALIGNMENT_INHERIT. The resolution matches {@link #setTextAlignment(int)} if it is 15960 * not TEXT_ALIGNMENT_INHERIT, otherwise resolution proceeds up the parent chain of the view. 15961 * 15962 * @return the resolved text alignment. Returns one of: 15963 * 15964 * {@link #TEXT_ALIGNMENT_GRAVITY}, 15965 * {@link #TEXT_ALIGNMENT_CENTER}, 15966 * {@link #TEXT_ALIGNMENT_TEXT_START}, 15967 * {@link #TEXT_ALIGNMENT_TEXT_END}, 15968 * {@link #TEXT_ALIGNMENT_VIEW_START}, 15969 * {@link #TEXT_ALIGNMENT_VIEW_END} 15970 */ 15971 @ViewDebug.ExportedProperty(category = "text", mapping = { 15972 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_INHERIT, to = "INHERIT"), 15973 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_GRAVITY, to = "GRAVITY"), 15974 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_START, to = "TEXT_START"), 15975 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_TEXT_END, to = "TEXT_END"), 15976 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_CENTER, to = "CENTER"), 15977 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_START, to = "VIEW_START"), 15978 @ViewDebug.IntToString(from = TEXT_ALIGNMENT_VIEW_END, to = "VIEW_END") 15979 }) 15980 public int getResolvedTextAlignment() { 15981 // If text alignment is not resolved, then resolve it 15982 if ((mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED) != TEXT_ALIGNMENT_RESOLVED) { 15983 resolveTextAlignment(); 15984 } 15985 return (mPrivateFlags2 & TEXT_ALIGNMENT_RESOLVED_MASK) >> TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT; 15986 } 15987 15988 /** 15989 * Resolve the text alignment. Will call {@link View#onResolvedTextAlignmentChanged} when 15990 * resolution is done. 15991 */ 15992 public void resolveTextAlignment() { 15993 // Reset any previous text alignment resolution 15994 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 15995 15996 if (hasRtlSupport()) { 15997 // Set resolved text alignment flag depending on text alignment flag 15998 final int textAlignment = getTextAlignment(); 15999 switch (textAlignment) { 16000 case TEXT_ALIGNMENT_INHERIT: 16001 // Check if we can resolve the text alignment 16002 if (canResolveLayoutDirection() && mParent instanceof View) { 16003 View view = (View) mParent; 16004 16005 final int parentResolvedTextAlignment = view.getResolvedTextAlignment(); 16006 switch (parentResolvedTextAlignment) { 16007 case TEXT_ALIGNMENT_GRAVITY: 16008 case TEXT_ALIGNMENT_TEXT_START: 16009 case TEXT_ALIGNMENT_TEXT_END: 16010 case TEXT_ALIGNMENT_CENTER: 16011 case TEXT_ALIGNMENT_VIEW_START: 16012 case TEXT_ALIGNMENT_VIEW_END: 16013 // Resolved text alignment is the same as the parent resolved 16014 // text alignment 16015 mPrivateFlags2 |= 16016 (parentResolvedTextAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16017 break; 16018 default: 16019 // Use default resolved text alignment 16020 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16021 } 16022 } 16023 else { 16024 // We cannot do the resolution if there is no parent so use the default 16025 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16026 } 16027 break; 16028 case TEXT_ALIGNMENT_GRAVITY: 16029 case TEXT_ALIGNMENT_TEXT_START: 16030 case TEXT_ALIGNMENT_TEXT_END: 16031 case TEXT_ALIGNMENT_CENTER: 16032 case TEXT_ALIGNMENT_VIEW_START: 16033 case TEXT_ALIGNMENT_VIEW_END: 16034 // Resolved text alignment is the same as text alignment 16035 mPrivateFlags2 |= (textAlignment << TEXT_ALIGNMENT_RESOLVED_MASK_SHIFT); 16036 break; 16037 default: 16038 // Use default resolved text alignment 16039 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16040 } 16041 } else { 16042 // Use default resolved text alignment 16043 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED_DEFAULT; 16044 } 16045 16046 // Set the resolved 16047 mPrivateFlags2 |= TEXT_ALIGNMENT_RESOLVED; 16048 onResolvedTextAlignmentChanged(); 16049 } 16050 16051 /** 16052 * Check if text alignment resolution can be done. 16053 * 16054 * @return true if text alignment resolution can be done otherwise return false. 16055 */ 16056 public boolean canResolveTextAlignment() { 16057 switch (getTextAlignment()) { 16058 case TEXT_DIRECTION_INHERIT: 16059 return (mParent != null); 16060 default: 16061 return true; 16062 } 16063 } 16064 16065 /** 16066 * Called when text alignment has been resolved. Subclasses that care about text alignment 16067 * resolution should override this method. 16068 * 16069 * The default implementation does nothing. 16070 */ 16071 public void onResolvedTextAlignmentChanged() { 16072 } 16073 16074 /** 16075 * Reset resolved text alignment. Text alignment can be resolved with a call to 16076 * getResolvedTextAlignment(). Will call {@link View#onResolvedTextAlignmentReset} when 16077 * reset is done. 16078 */ 16079 public void resetResolvedTextAlignment() { 16080 // Reset any previous text alignment resolution 16081 mPrivateFlags2 &= ~(TEXT_ALIGNMENT_RESOLVED | TEXT_ALIGNMENT_RESOLVED_MASK); 16082 onResolvedTextAlignmentReset(); 16083 } 16084 16085 /** 16086 * Called when text alignment is reset. Subclasses that care about text alignment reset should 16087 * override this method and do a reset of the text alignment of their children. The default 16088 * implementation does nothing. 16089 */ 16090 public void onResolvedTextAlignmentReset() { 16091 } 16092 16093 // 16094 // Properties 16095 // 16096 /** 16097 * A Property wrapper around the <code>alpha</code> functionality handled by the 16098 * {@link View#setAlpha(float)} and {@link View#getAlpha()} methods. 16099 */ 16100 public static final Property<View, Float> ALPHA = new FloatProperty<View>("alpha") { 16101 @Override 16102 public void setValue(View object, float value) { 16103 object.setAlpha(value); 16104 } 16105 16106 @Override 16107 public Float get(View object) { 16108 return object.getAlpha(); 16109 } 16110 }; 16111 16112 /** 16113 * A Property wrapper around the <code>translationX</code> functionality handled by the 16114 * {@link View#setTranslationX(float)} and {@link View#getTranslationX()} methods. 16115 */ 16116 public static final Property<View, Float> TRANSLATION_X = new FloatProperty<View>("translationX") { 16117 @Override 16118 public void setValue(View object, float value) { 16119 object.setTranslationX(value); 16120 } 16121 16122 @Override 16123 public Float get(View object) { 16124 return object.getTranslationX(); 16125 } 16126 }; 16127 16128 /** 16129 * A Property wrapper around the <code>translationY</code> functionality handled by the 16130 * {@link View#setTranslationY(float)} and {@link View#getTranslationY()} methods. 16131 */ 16132 public static final Property<View, Float> TRANSLATION_Y = new FloatProperty<View>("translationY") { 16133 @Override 16134 public void setValue(View object, float value) { 16135 object.setTranslationY(value); 16136 } 16137 16138 @Override 16139 public Float get(View object) { 16140 return object.getTranslationY(); 16141 } 16142 }; 16143 16144 /** 16145 * A Property wrapper around the <code>x</code> functionality handled by the 16146 * {@link View#setX(float)} and {@link View#getX()} methods. 16147 */ 16148 public static final Property<View, Float> X = new FloatProperty<View>("x") { 16149 @Override 16150 public void setValue(View object, float value) { 16151 object.setX(value); 16152 } 16153 16154 @Override 16155 public Float get(View object) { 16156 return object.getX(); 16157 } 16158 }; 16159 16160 /** 16161 * A Property wrapper around the <code>y</code> functionality handled by the 16162 * {@link View#setY(float)} and {@link View#getY()} methods. 16163 */ 16164 public static final Property<View, Float> Y = new FloatProperty<View>("y") { 16165 @Override 16166 public void setValue(View object, float value) { 16167 object.setY(value); 16168 } 16169 16170 @Override 16171 public Float get(View object) { 16172 return object.getY(); 16173 } 16174 }; 16175 16176 /** 16177 * A Property wrapper around the <code>rotation</code> functionality handled by the 16178 * {@link View#setRotation(float)} and {@link View#getRotation()} methods. 16179 */ 16180 public static final Property<View, Float> ROTATION = new FloatProperty<View>("rotation") { 16181 @Override 16182 public void setValue(View object, float value) { 16183 object.setRotation(value); 16184 } 16185 16186 @Override 16187 public Float get(View object) { 16188 return object.getRotation(); 16189 } 16190 }; 16191 16192 /** 16193 * A Property wrapper around the <code>rotationX</code> functionality handled by the 16194 * {@link View#setRotationX(float)} and {@link View#getRotationX()} methods. 16195 */ 16196 public static final Property<View, Float> ROTATION_X = new FloatProperty<View>("rotationX") { 16197 @Override 16198 public void setValue(View object, float value) { 16199 object.setRotationX(value); 16200 } 16201 16202 @Override 16203 public Float get(View object) { 16204 return object.getRotationX(); 16205 } 16206 }; 16207 16208 /** 16209 * A Property wrapper around the <code>rotationY</code> functionality handled by the 16210 * {@link View#setRotationY(float)} and {@link View#getRotationY()} methods. 16211 */ 16212 public static final Property<View, Float> ROTATION_Y = new FloatProperty<View>("rotationY") { 16213 @Override 16214 public void setValue(View object, float value) { 16215 object.setRotationY(value); 16216 } 16217 16218 @Override 16219 public Float get(View object) { 16220 return object.getRotationY(); 16221 } 16222 }; 16223 16224 /** 16225 * A Property wrapper around the <code>scaleX</code> functionality handled by the 16226 * {@link View#setScaleX(float)} and {@link View#getScaleX()} methods. 16227 */ 16228 public static final Property<View, Float> SCALE_X = new FloatProperty<View>("scaleX") { 16229 @Override 16230 public void setValue(View object, float value) { 16231 object.setScaleX(value); 16232 } 16233 16234 @Override 16235 public Float get(View object) { 16236 return object.getScaleX(); 16237 } 16238 }; 16239 16240 /** 16241 * A Property wrapper around the <code>scaleY</code> functionality handled by the 16242 * {@link View#setScaleY(float)} and {@link View#getScaleY()} methods. 16243 */ 16244 public static final Property<View, Float> SCALE_Y = new FloatProperty<View>("scaleY") { 16245 @Override 16246 public void setValue(View object, float value) { 16247 object.setScaleY(value); 16248 } 16249 16250 @Override 16251 public Float get(View object) { 16252 return object.getScaleY(); 16253 } 16254 }; 16255 16256 /** 16257 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 16258 * Each MeasureSpec represents a requirement for either the width or the height. 16259 * A MeasureSpec is comprised of a size and a mode. There are three possible 16260 * modes: 16261 * <dl> 16262 * <dt>UNSPECIFIED</dt> 16263 * <dd> 16264 * The parent has not imposed any constraint on the child. It can be whatever size 16265 * it wants. 16266 * </dd> 16267 * 16268 * <dt>EXACTLY</dt> 16269 * <dd> 16270 * The parent has determined an exact size for the child. The child is going to be 16271 * given those bounds regardless of how big it wants to be. 16272 * </dd> 16273 * 16274 * <dt>AT_MOST</dt> 16275 * <dd> 16276 * The child can be as large as it wants up to the specified size. 16277 * </dd> 16278 * </dl> 16279 * 16280 * MeasureSpecs are implemented as ints to reduce object allocation. This class 16281 * is provided to pack and unpack the <size, mode> tuple into the int. 16282 */ 16283 public static class MeasureSpec { 16284 private static final int MODE_SHIFT = 30; 16285 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 16286 16287 /** 16288 * Measure specification mode: The parent has not imposed any constraint 16289 * on the child. It can be whatever size it wants. 16290 */ 16291 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 16292 16293 /** 16294 * Measure specification mode: The parent has determined an exact size 16295 * for the child. The child is going to be given those bounds regardless 16296 * of how big it wants to be. 16297 */ 16298 public static final int EXACTLY = 1 << MODE_SHIFT; 16299 16300 /** 16301 * Measure specification mode: The child can be as large as it wants up 16302 * to the specified size. 16303 */ 16304 public static final int AT_MOST = 2 << MODE_SHIFT; 16305 16306 /** 16307 * Creates a measure specification based on the supplied size and mode. 16308 * 16309 * The mode must always be one of the following: 16310 * <ul> 16311 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 16312 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 16313 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 16314 * </ul> 16315 * 16316 * @param size the size of the measure specification 16317 * @param mode the mode of the measure specification 16318 * @return the measure specification based on size and mode 16319 */ 16320 public static int makeMeasureSpec(int size, int mode) { 16321 return size + mode; 16322 } 16323 16324 /** 16325 * Extracts the mode from the supplied measure specification. 16326 * 16327 * @param measureSpec the measure specification to extract the mode from 16328 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 16329 * {@link android.view.View.MeasureSpec#AT_MOST} or 16330 * {@link android.view.View.MeasureSpec#EXACTLY} 16331 */ 16332 public static int getMode(int measureSpec) { 16333 return (measureSpec & MODE_MASK); 16334 } 16335 16336 /** 16337 * Extracts the size from the supplied measure specification. 16338 * 16339 * @param measureSpec the measure specification to extract the size from 16340 * @return the size in pixels defined in the supplied measure specification 16341 */ 16342 public static int getSize(int measureSpec) { 16343 return (measureSpec & ~MODE_MASK); 16344 } 16345 16346 /** 16347 * Returns a String representation of the specified measure 16348 * specification. 16349 * 16350 * @param measureSpec the measure specification to convert to a String 16351 * @return a String with the following format: "MeasureSpec: MODE SIZE" 16352 */ 16353 public static String toString(int measureSpec) { 16354 int mode = getMode(measureSpec); 16355 int size = getSize(measureSpec); 16356 16357 StringBuilder sb = new StringBuilder("MeasureSpec: "); 16358 16359 if (mode == UNSPECIFIED) 16360 sb.append("UNSPECIFIED "); 16361 else if (mode == EXACTLY) 16362 sb.append("EXACTLY "); 16363 else if (mode == AT_MOST) 16364 sb.append("AT_MOST "); 16365 else 16366 sb.append(mode).append(" "); 16367 16368 sb.append(size); 16369 return sb.toString(); 16370 } 16371 } 16372 16373 class CheckForLongPress implements Runnable { 16374 16375 private int mOriginalWindowAttachCount; 16376 16377 public void run() { 16378 if (isPressed() && (mParent != null) 16379 && mOriginalWindowAttachCount == mWindowAttachCount) { 16380 if (performLongClick()) { 16381 mHasPerformedLongPress = true; 16382 } 16383 } 16384 } 16385 16386 public void rememberWindowAttachCount() { 16387 mOriginalWindowAttachCount = mWindowAttachCount; 16388 } 16389 } 16390 16391 private final class CheckForTap implements Runnable { 16392 public void run() { 16393 mPrivateFlags &= ~PREPRESSED; 16394 setPressed(true); 16395 checkForLongClick(ViewConfiguration.getTapTimeout()); 16396 } 16397 } 16398 16399 private final class PerformClick implements Runnable { 16400 public void run() { 16401 performClick(); 16402 } 16403 } 16404 16405 /** @hide */ 16406 public void hackTurnOffWindowResizeAnim(boolean off) { 16407 mAttachInfo.mTurnOffWindowResizeAnim = off; 16408 } 16409 16410 /** 16411 * This method returns a ViewPropertyAnimator object, which can be used to animate 16412 * specific properties on this View. 16413 * 16414 * @return ViewPropertyAnimator The ViewPropertyAnimator associated with this View. 16415 */ 16416 public ViewPropertyAnimator animate() { 16417 if (mAnimator == null) { 16418 mAnimator = new ViewPropertyAnimator(this); 16419 } 16420 return mAnimator; 16421 } 16422 16423 /** 16424 * Interface definition for a callback to be invoked when a key event is 16425 * dispatched to this view. The callback will be invoked before the key 16426 * event is given to the view. 16427 */ 16428 public interface OnKeyListener { 16429 /** 16430 * Called when a key is dispatched to a view. This allows listeners to 16431 * get a chance to respond before the target view. 16432 * 16433 * @param v The view the key has been dispatched to. 16434 * @param keyCode The code for the physical key that was pressed 16435 * @param event The KeyEvent object containing full information about 16436 * the event. 16437 * @return True if the listener has consumed the event, false otherwise. 16438 */ 16439 boolean onKey(View v, int keyCode, KeyEvent event); 16440 } 16441 16442 /** 16443 * Interface definition for a callback to be invoked when a touch event is 16444 * dispatched to this view. The callback will be invoked before the touch 16445 * event is given to the view. 16446 */ 16447 public interface OnTouchListener { 16448 /** 16449 * Called when a touch event is dispatched to a view. This allows listeners to 16450 * get a chance to respond before the target view. 16451 * 16452 * @param v The view the touch event has been dispatched to. 16453 * @param event The MotionEvent object containing full information about 16454 * the event. 16455 * @return True if the listener has consumed the event, false otherwise. 16456 */ 16457 boolean onTouch(View v, MotionEvent event); 16458 } 16459 16460 /** 16461 * Interface definition for a callback to be invoked when a hover event is 16462 * dispatched to this view. The callback will be invoked before the hover 16463 * event is given to the view. 16464 */ 16465 public interface OnHoverListener { 16466 /** 16467 * Called when a hover event is dispatched to a view. This allows listeners to 16468 * get a chance to respond before the target view. 16469 * 16470 * @param v The view the hover event has been dispatched to. 16471 * @param event The MotionEvent object containing full information about 16472 * the event. 16473 * @return True if the listener has consumed the event, false otherwise. 16474 */ 16475 boolean onHover(View v, MotionEvent event); 16476 } 16477 16478 /** 16479 * Interface definition for a callback to be invoked when a generic motion event is 16480 * dispatched to this view. The callback will be invoked before the generic motion 16481 * event is given to the view. 16482 */ 16483 public interface OnGenericMotionListener { 16484 /** 16485 * Called when a generic motion event is dispatched to a view. This allows listeners to 16486 * get a chance to respond before the target view. 16487 * 16488 * @param v The view the generic motion event has been dispatched to. 16489 * @param event The MotionEvent object containing full information about 16490 * the event. 16491 * @return True if the listener has consumed the event, false otherwise. 16492 */ 16493 boolean onGenericMotion(View v, MotionEvent event); 16494 } 16495 16496 /** 16497 * Interface definition for a callback to be invoked when a view has been clicked and held. 16498 */ 16499 public interface OnLongClickListener { 16500 /** 16501 * Called when a view has been clicked and held. 16502 * 16503 * @param v The view that was clicked and held. 16504 * 16505 * @return true if the callback consumed the long click, false otherwise. 16506 */ 16507 boolean onLongClick(View v); 16508 } 16509 16510 /** 16511 * Interface definition for a callback to be invoked when a drag is being dispatched 16512 * to this view. The callback will be invoked before the hosting view's own 16513 * onDrag(event) method. If the listener wants to fall back to the hosting view's 16514 * onDrag(event) behavior, it should return 'false' from this callback. 16515 * 16516 * <div class="special reference"> 16517 * <h3>Developer Guides</h3> 16518 * <p>For a guide to implementing drag and drop features, read the 16519 * <a href="{@docRoot}guide/topics/ui/drag-drop.html">Drag and Drop</a> developer guide.</p> 16520 * </div> 16521 */ 16522 public interface OnDragListener { 16523 /** 16524 * Called when a drag event is dispatched to a view. This allows listeners 16525 * to get a chance to override base View behavior. 16526 * 16527 * @param v The View that received the drag event. 16528 * @param event The {@link android.view.DragEvent} object for the drag event. 16529 * @return {@code true} if the drag event was handled successfully, or {@code false} 16530 * if the drag event was not handled. Note that {@code false} will trigger the View 16531 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 16532 */ 16533 boolean onDrag(View v, DragEvent event); 16534 } 16535 16536 /** 16537 * Interface definition for a callback to be invoked when the focus state of 16538 * a view changed. 16539 */ 16540 public interface OnFocusChangeListener { 16541 /** 16542 * Called when the focus state of a view has changed. 16543 * 16544 * @param v The view whose state has changed. 16545 * @param hasFocus The new focus state of v. 16546 */ 16547 void onFocusChange(View v, boolean hasFocus); 16548 } 16549 16550 /** 16551 * Interface definition for a callback to be invoked when a view is clicked. 16552 */ 16553 public interface OnClickListener { 16554 /** 16555 * Called when a view has been clicked. 16556 * 16557 * @param v The view that was clicked. 16558 */ 16559 void onClick(View v); 16560 } 16561 16562 /** 16563 * Interface definition for a callback to be invoked when the context menu 16564 * for this view is being built. 16565 */ 16566 public interface OnCreateContextMenuListener { 16567 /** 16568 * Called when the context menu for this view is being built. It is not 16569 * safe to hold onto the menu after this method returns. 16570 * 16571 * @param menu The context menu that is being built 16572 * @param v The view for which the context menu is being built 16573 * @param menuInfo Extra information about the item for which the 16574 * context menu should be shown. This information will vary 16575 * depending on the class of v. 16576 */ 16577 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 16578 } 16579 16580 /** 16581 * Interface definition for a callback to be invoked when the status bar changes 16582 * visibility. This reports <strong>global</strong> changes to the system UI 16583 * state, not just what the application is requesting. 16584 * 16585 * @see View#setOnSystemUiVisibilityChangeListener(android.view.View.OnSystemUiVisibilityChangeListener) 16586 */ 16587 public interface OnSystemUiVisibilityChangeListener { 16588 /** 16589 * Called when the status bar changes visibility because of a call to 16590 * {@link View#setSystemUiVisibility(int)}. 16591 * 16592 * @param visibility Bitwise-or of flags {@link #SYSTEM_UI_FLAG_LOW_PROFILE} or 16593 * {@link #SYSTEM_UI_FLAG_HIDE_NAVIGATION}. This tells you the 16594 * <strong>global</strong> state of the UI visibility flags, not what your 16595 * app is currently applying. 16596 */ 16597 public void onSystemUiVisibilityChange(int visibility); 16598 } 16599 16600 /** 16601 * Interface definition for a callback to be invoked when this view is attached 16602 * or detached from its window. 16603 */ 16604 public interface OnAttachStateChangeListener { 16605 /** 16606 * Called when the view is attached to a window. 16607 * @param v The view that was attached 16608 */ 16609 public void onViewAttachedToWindow(View v); 16610 /** 16611 * Called when the view is detached from a window. 16612 * @param v The view that was detached 16613 */ 16614 public void onViewDetachedFromWindow(View v); 16615 } 16616 16617 private final class UnsetPressedState implements Runnable { 16618 public void run() { 16619 setPressed(false); 16620 } 16621 } 16622 16623 /** 16624 * Base class for derived classes that want to save and restore their own 16625 * state in {@link android.view.View#onSaveInstanceState()}. 16626 */ 16627 public static class BaseSavedState extends AbsSavedState { 16628 /** 16629 * Constructor used when reading from a parcel. Reads the state of the superclass. 16630 * 16631 * @param source 16632 */ 16633 public BaseSavedState(Parcel source) { 16634 super(source); 16635 } 16636 16637 /** 16638 * Constructor called by derived classes when creating their SavedState objects 16639 * 16640 * @param superState The state of the superclass of this view 16641 */ 16642 public BaseSavedState(Parcelable superState) { 16643 super(superState); 16644 } 16645 16646 public static final Parcelable.Creator<BaseSavedState> CREATOR = 16647 new Parcelable.Creator<BaseSavedState>() { 16648 public BaseSavedState createFromParcel(Parcel in) { 16649 return new BaseSavedState(in); 16650 } 16651 16652 public BaseSavedState[] newArray(int size) { 16653 return new BaseSavedState[size]; 16654 } 16655 }; 16656 } 16657 16658 /** 16659 * A set of information given to a view when it is attached to its parent 16660 * window. 16661 */ 16662 static class AttachInfo { 16663 interface Callbacks { 16664 void playSoundEffect(int effectId); 16665 boolean performHapticFeedback(int effectId, boolean always); 16666 } 16667 16668 /** 16669 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 16670 * to a Handler. This class contains the target (View) to invalidate and 16671 * the coordinates of the dirty rectangle. 16672 * 16673 * For performance purposes, this class also implements a pool of up to 16674 * POOL_LIMIT objects that get reused. This reduces memory allocations 16675 * whenever possible. 16676 */ 16677 static class InvalidateInfo implements Poolable<InvalidateInfo> { 16678 private static final int POOL_LIMIT = 10; 16679 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 16680 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 16681 public InvalidateInfo newInstance() { 16682 return new InvalidateInfo(); 16683 } 16684 16685 public void onAcquired(InvalidateInfo element) { 16686 } 16687 16688 public void onReleased(InvalidateInfo element) { 16689 element.target = null; 16690 } 16691 }, POOL_LIMIT) 16692 ); 16693 16694 private InvalidateInfo mNext; 16695 private boolean mIsPooled; 16696 16697 View target; 16698 16699 int left; 16700 int top; 16701 int right; 16702 int bottom; 16703 16704 public void setNextPoolable(InvalidateInfo element) { 16705 mNext = element; 16706 } 16707 16708 public InvalidateInfo getNextPoolable() { 16709 return mNext; 16710 } 16711 16712 static InvalidateInfo acquire() { 16713 return sPool.acquire(); 16714 } 16715 16716 void release() { 16717 sPool.release(this); 16718 } 16719 16720 public boolean isPooled() { 16721 return mIsPooled; 16722 } 16723 16724 public void setPooled(boolean isPooled) { 16725 mIsPooled = isPooled; 16726 } 16727 } 16728 16729 final IWindowSession mSession; 16730 16731 final IWindow mWindow; 16732 16733 final IBinder mWindowToken; 16734 16735 final Callbacks mRootCallbacks; 16736 16737 HardwareCanvas mHardwareCanvas; 16738 16739 /** 16740 * The top view of the hierarchy. 16741 */ 16742 View mRootView; 16743 16744 IBinder mPanelParentWindowToken; 16745 Surface mSurface; 16746 16747 boolean mHardwareAccelerated; 16748 boolean mHardwareAccelerationRequested; 16749 HardwareRenderer mHardwareRenderer; 16750 16751 boolean mScreenOn; 16752 16753 /** 16754 * Scale factor used by the compatibility mode 16755 */ 16756 float mApplicationScale; 16757 16758 /** 16759 * Indicates whether the application is in compatibility mode 16760 */ 16761 boolean mScalingRequired; 16762 16763 /** 16764 * If set, ViewAncestor doesn't use its lame animation for when the window resizes. 16765 */ 16766 boolean mTurnOffWindowResizeAnim; 16767 16768 /** 16769 * Left position of this view's window 16770 */ 16771 int mWindowLeft; 16772 16773 /** 16774 * Top position of this view's window 16775 */ 16776 int mWindowTop; 16777 16778 /** 16779 * Indicates whether views need to use 32-bit drawing caches 16780 */ 16781 boolean mUse32BitDrawingCache; 16782 16783 /** 16784 * For windows that are full-screen but using insets to layout inside 16785 * of the screen decorations, these are the current insets for the 16786 * content of the window. 16787 */ 16788 final Rect mContentInsets = new Rect(); 16789 16790 /** 16791 * For windows that are full-screen but using insets to layout inside 16792 * of the screen decorations, these are the current insets for the 16793 * actual visible parts of the window. 16794 */ 16795 final Rect mVisibleInsets = new Rect(); 16796 16797 /** 16798 * The internal insets given by this window. This value is 16799 * supplied by the client (through 16800 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 16801 * be given to the window manager when changed to be used in laying 16802 * out windows behind it. 16803 */ 16804 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 16805 = new ViewTreeObserver.InternalInsetsInfo(); 16806 16807 /** 16808 * All views in the window's hierarchy that serve as scroll containers, 16809 * used to determine if the window can be resized or must be panned 16810 * to adjust for a soft input area. 16811 */ 16812 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 16813 16814 final KeyEvent.DispatcherState mKeyDispatchState 16815 = new KeyEvent.DispatcherState(); 16816 16817 /** 16818 * Indicates whether the view's window currently has the focus. 16819 */ 16820 boolean mHasWindowFocus; 16821 16822 /** 16823 * The current visibility of the window. 16824 */ 16825 int mWindowVisibility; 16826 16827 /** 16828 * Indicates the time at which drawing started to occur. 16829 */ 16830 long mDrawingTime; 16831 16832 /** 16833 * Indicates whether or not ignoring the DIRTY_MASK flags. 16834 */ 16835 boolean mIgnoreDirtyState; 16836 16837 /** 16838 * This flag tracks when the mIgnoreDirtyState flag is set during draw(), 16839 * to avoid clearing that flag prematurely. 16840 */ 16841 boolean mSetIgnoreDirtyState = false; 16842 16843 /** 16844 * Indicates whether the view's window is currently in touch mode. 16845 */ 16846 boolean mInTouchMode; 16847 16848 /** 16849 * Indicates that ViewAncestor should trigger a global layout change 16850 * the next time it performs a traversal 16851 */ 16852 boolean mRecomputeGlobalAttributes; 16853 16854 /** 16855 * Always report new attributes at next traversal. 16856 */ 16857 boolean mForceReportNewAttributes; 16858 16859 /** 16860 * Set during a traveral if any views want to keep the screen on. 16861 */ 16862 boolean mKeepScreenOn; 16863 16864 /** 16865 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 16866 */ 16867 int mSystemUiVisibility; 16868 16869 /** 16870 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 16871 * attached. 16872 */ 16873 boolean mHasSystemUiListeners; 16874 16875 /** 16876 * Set if the visibility of any views has changed. 16877 */ 16878 boolean mViewVisibilityChanged; 16879 16880 /** 16881 * Set to true if a view has been scrolled. 16882 */ 16883 boolean mViewScrollChanged; 16884 16885 /** 16886 * Global to the view hierarchy used as a temporary for dealing with 16887 * x/y points in the transparent region computations. 16888 */ 16889 final int[] mTransparentLocation = new int[2]; 16890 16891 /** 16892 * Global to the view hierarchy used as a temporary for dealing with 16893 * x/y points in the ViewGroup.invalidateChild implementation. 16894 */ 16895 final int[] mInvalidateChildLocation = new int[2]; 16896 16897 16898 /** 16899 * Global to the view hierarchy used as a temporary for dealing with 16900 * x/y location when view is transformed. 16901 */ 16902 final float[] mTmpTransformLocation = new float[2]; 16903 16904 /** 16905 * The view tree observer used to dispatch global events like 16906 * layout, pre-draw, touch mode change, etc. 16907 */ 16908 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 16909 16910 /** 16911 * A Canvas used by the view hierarchy to perform bitmap caching. 16912 */ 16913 Canvas mCanvas; 16914 16915 /** 16916 * The view root impl. 16917 */ 16918 final ViewRootImpl mViewRootImpl; 16919 16920 /** 16921 * A Handler supplied by a view's {@link android.view.ViewRootImpl}. This 16922 * handler can be used to pump events in the UI events queue. 16923 */ 16924 final Handler mHandler; 16925 16926 /** 16927 * Temporary for use in computing invalidate rectangles while 16928 * calling up the hierarchy. 16929 */ 16930 final Rect mTmpInvalRect = new Rect(); 16931 16932 /** 16933 * Temporary for use in computing hit areas with transformed views 16934 */ 16935 final RectF mTmpTransformRect = new RectF(); 16936 16937 /** 16938 * Temporary list for use in collecting focusable descendents of a view. 16939 */ 16940 final ArrayList<View> mTempArrayList = new ArrayList<View>(24); 16941 16942 /** 16943 * The id of the window for accessibility purposes. 16944 */ 16945 int mAccessibilityWindowId = View.NO_ID; 16946 16947 /** 16948 * Whether to ingore not exposed for accessibility Views when 16949 * reporting the view tree to accessibility services. 16950 */ 16951 boolean mIncludeNotImportantViews; 16952 16953 /** 16954 * The drawable for highlighting accessibility focus. 16955 */ 16956 Drawable mAccessibilityFocusDrawable; 16957 16958 /** 16959 * Show where the margins, bounds and layout bounds are for each view. 16960 */ 16961 final boolean mDebugLayout = SystemProperties.getBoolean(DEBUG_LAYOUT_PROPERTY, false); 16962 16963 /** 16964 * Creates a new set of attachment information with the specified 16965 * events handler and thread. 16966 * 16967 * @param handler the events handler the view must use 16968 */ 16969 AttachInfo(IWindowSession session, IWindow window, 16970 ViewRootImpl viewRootImpl, Handler handler, Callbacks effectPlayer) { 16971 mSession = session; 16972 mWindow = window; 16973 mWindowToken = window.asBinder(); 16974 mViewRootImpl = viewRootImpl; 16975 mHandler = handler; 16976 mRootCallbacks = effectPlayer; 16977 } 16978 } 16979 16980 /** 16981 * <p>ScrollabilityCache holds various fields used by a View when scrolling 16982 * is supported. This avoids keeping too many unused fields in most 16983 * instances of View.</p> 16984 */ 16985 private static class ScrollabilityCache implements Runnable { 16986 16987 /** 16988 * Scrollbars are not visible 16989 */ 16990 public static final int OFF = 0; 16991 16992 /** 16993 * Scrollbars are visible 16994 */ 16995 public static final int ON = 1; 16996 16997 /** 16998 * Scrollbars are fading away 16999 */ 17000 public static final int FADING = 2; 17001 17002 public boolean fadeScrollBars; 17003 17004 public int fadingEdgeLength; 17005 public int scrollBarDefaultDelayBeforeFade; 17006 public int scrollBarFadeDuration; 17007 17008 public int scrollBarSize; 17009 public ScrollBarDrawable scrollBar; 17010 public float[] interpolatorValues; 17011 public View host; 17012 17013 public final Paint paint; 17014 public final Matrix matrix; 17015 public Shader shader; 17016 17017 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 17018 17019 private static final float[] OPAQUE = { 255 }; 17020 private static final float[] TRANSPARENT = { 0.0f }; 17021 17022 /** 17023 * When fading should start. This time moves into the future every time 17024 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 17025 */ 17026 public long fadeStartTime; 17027 17028 17029 /** 17030 * The current state of the scrollbars: ON, OFF, or FADING 17031 */ 17032 public int state = OFF; 17033 17034 private int mLastColor; 17035 17036 public ScrollabilityCache(ViewConfiguration configuration, View host) { 17037 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 17038 scrollBarSize = configuration.getScaledScrollBarSize(); 17039 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 17040 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 17041 17042 paint = new Paint(); 17043 matrix = new Matrix(); 17044 // use use a height of 1, and then wack the matrix each time we 17045 // actually use it. 17046 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 17047 17048 paint.setShader(shader); 17049 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 17050 this.host = host; 17051 } 17052 17053 public void setFadeColor(int color) { 17054 if (color != 0 && color != mLastColor) { 17055 mLastColor = color; 17056 color |= 0xFF000000; 17057 17058 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 17059 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 17060 17061 paint.setShader(shader); 17062 // Restore the default transfer mode (src_over) 17063 paint.setXfermode(null); 17064 } 17065 } 17066 17067 public void run() { 17068 long now = AnimationUtils.currentAnimationTimeMillis(); 17069 if (now >= fadeStartTime) { 17070 17071 // the animation fades the scrollbars out by changing 17072 // the opacity (alpha) from fully opaque to fully 17073 // transparent 17074 int nextFrame = (int) now; 17075 int framesCount = 0; 17076 17077 Interpolator interpolator = scrollBarInterpolator; 17078 17079 // Start opaque 17080 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 17081 17082 // End transparent 17083 nextFrame += scrollBarFadeDuration; 17084 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 17085 17086 state = FADING; 17087 17088 // Kick off the fade animation 17089 host.invalidate(true); 17090 } 17091 } 17092 } 17093 17094 /** 17095 * Resuable callback for sending 17096 * {@link AccessibilityEvent#TYPE_VIEW_SCROLLED} accessibility event. 17097 */ 17098 private class SendViewScrolledAccessibilityEvent implements Runnable { 17099 public volatile boolean mIsPending; 17100 17101 public void run() { 17102 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_SCROLLED); 17103 mIsPending = false; 17104 } 17105 } 17106 17107 /** 17108 * <p> 17109 * This class represents a delegate that can be registered in a {@link View} 17110 * to enhance accessibility support via composition rather via inheritance. 17111 * It is specifically targeted to widget developers that extend basic View 17112 * classes i.e. classes in package android.view, that would like their 17113 * applications to be backwards compatible. 17114 * </p> 17115 * <div class="special reference"> 17116 * <h3>Developer Guides</h3> 17117 * <p>For more information about making applications accessible, read the 17118 * <a href="{@docRoot}guide/topics/ui/accessibility/index.html">Accessibility</a> 17119 * developer guide.</p> 17120 * </div> 17121 * <p> 17122 * A scenario in which a developer would like to use an accessibility delegate 17123 * is overriding a method introduced in a later API version then the minimal API 17124 * version supported by the application. For example, the method 17125 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} is not available 17126 * in API version 4 when the accessibility APIs were first introduced. If a 17127 * developer would like his application to run on API version 4 devices (assuming 17128 * all other APIs used by the application are version 4 or lower) and take advantage 17129 * of this method, instead of overriding the method which would break the application's 17130 * backwards compatibility, he can override the corresponding method in this 17131 * delegate and register the delegate in the target View if the API version of 17132 * the system is high enough i.e. the API version is same or higher to the API 17133 * version that introduced 17134 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)}. 17135 * </p> 17136 * <p> 17137 * Here is an example implementation: 17138 * </p> 17139 * <code><pre><p> 17140 * if (Build.VERSION.SDK_INT >= 14) { 17141 * // If the API version is equal of higher than the version in 17142 * // which onInitializeAccessibilityNodeInfo was introduced we 17143 * // register a delegate with a customized implementation. 17144 * View view = findViewById(R.id.view_id); 17145 * view.setAccessibilityDelegate(new AccessibilityDelegate() { 17146 * public void onInitializeAccessibilityNodeInfo(View host, 17147 * AccessibilityNodeInfo info) { 17148 * // Let the default implementation populate the info. 17149 * super.onInitializeAccessibilityNodeInfo(host, info); 17150 * // Set some other information. 17151 * info.setEnabled(host.isEnabled()); 17152 * } 17153 * }); 17154 * } 17155 * </code></pre></p> 17156 * <p> 17157 * This delegate contains methods that correspond to the accessibility methods 17158 * in View. If a delegate has been specified the implementation in View hands 17159 * off handling to the corresponding method in this delegate. The default 17160 * implementation the delegate methods behaves exactly as the corresponding 17161 * method in View for the case of no accessibility delegate been set. Hence, 17162 * to customize the behavior of a View method, clients can override only the 17163 * corresponding delegate method without altering the behavior of the rest 17164 * accessibility related methods of the host view. 17165 * </p> 17166 */ 17167 public static class AccessibilityDelegate { 17168 17169 /** 17170 * Sends an accessibility event of the given type. If accessibility is not 17171 * enabled this method has no effect. 17172 * <p> 17173 * The default implementation behaves as {@link View#sendAccessibilityEvent(int) 17174 * View#sendAccessibilityEvent(int)} for the case of no accessibility delegate 17175 * been set. 17176 * </p> 17177 * 17178 * @param host The View hosting the delegate. 17179 * @param eventType The type of the event to send. 17180 * 17181 * @see View#sendAccessibilityEvent(int) View#sendAccessibilityEvent(int) 17182 */ 17183 public void sendAccessibilityEvent(View host, int eventType) { 17184 host.sendAccessibilityEventInternal(eventType); 17185 } 17186 17187 /** 17188 * Sends an accessibility event. This method behaves exactly as 17189 * {@link #sendAccessibilityEvent(View, int)} but takes as an argument an 17190 * empty {@link AccessibilityEvent} and does not perform a check whether 17191 * accessibility is enabled. 17192 * <p> 17193 * The default implementation behaves as 17194 * {@link View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17195 * View#sendAccessibilityEventUnchecked(AccessibilityEvent)} for 17196 * the case of no accessibility delegate been set. 17197 * </p> 17198 * 17199 * @param host The View hosting the delegate. 17200 * @param event The event to send. 17201 * 17202 * @see View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17203 * View#sendAccessibilityEventUnchecked(AccessibilityEvent) 17204 */ 17205 public void sendAccessibilityEventUnchecked(View host, AccessibilityEvent event) { 17206 host.sendAccessibilityEventUncheckedInternal(event); 17207 } 17208 17209 /** 17210 * Dispatches an {@link AccessibilityEvent} to the host {@link View} first and then 17211 * to its children for adding their text content to the event. 17212 * <p> 17213 * The default implementation behaves as 17214 * {@link View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17215 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent)} for 17216 * the case of no accessibility delegate been set. 17217 * </p> 17218 * 17219 * @param host The View hosting the delegate. 17220 * @param event The event. 17221 * @return True if the event population was completed. 17222 * 17223 * @see View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17224 * View#dispatchPopulateAccessibilityEvent(AccessibilityEvent) 17225 */ 17226 public boolean dispatchPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17227 return host.dispatchPopulateAccessibilityEventInternal(event); 17228 } 17229 17230 /** 17231 * Gives a chance to the host View to populate the accessibility event with its 17232 * text content. 17233 * <p> 17234 * The default implementation behaves as 17235 * {@link View#onPopulateAccessibilityEvent(AccessibilityEvent) 17236 * View#onPopulateAccessibilityEvent(AccessibilityEvent)} for 17237 * the case of no accessibility delegate been set. 17238 * </p> 17239 * 17240 * @param host The View hosting the delegate. 17241 * @param event The accessibility event which to populate. 17242 * 17243 * @see View#onPopulateAccessibilityEvent(AccessibilityEvent) 17244 * View#onPopulateAccessibilityEvent(AccessibilityEvent) 17245 */ 17246 public void onPopulateAccessibilityEvent(View host, AccessibilityEvent event) { 17247 host.onPopulateAccessibilityEventInternal(event); 17248 } 17249 17250 /** 17251 * Initializes an {@link AccessibilityEvent} with information about the 17252 * the host View which is the event source. 17253 * <p> 17254 * The default implementation behaves as 17255 * {@link View#onInitializeAccessibilityEvent(AccessibilityEvent) 17256 * View#onInitializeAccessibilityEvent(AccessibilityEvent)} for 17257 * the case of no accessibility delegate been set. 17258 * </p> 17259 * 17260 * @param host The View hosting the delegate. 17261 * @param event The event to initialize. 17262 * 17263 * @see View#onInitializeAccessibilityEvent(AccessibilityEvent) 17264 * View#onInitializeAccessibilityEvent(AccessibilityEvent) 17265 */ 17266 public void onInitializeAccessibilityEvent(View host, AccessibilityEvent event) { 17267 host.onInitializeAccessibilityEventInternal(event); 17268 } 17269 17270 /** 17271 * Initializes an {@link AccessibilityNodeInfo} with information about the host view. 17272 * <p> 17273 * The default implementation behaves as 17274 * {@link View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17275 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo)} for 17276 * the case of no accessibility delegate been set. 17277 * </p> 17278 * 17279 * @param host The View hosting the delegate. 17280 * @param info The instance to initialize. 17281 * 17282 * @see View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17283 * View#onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo) 17284 */ 17285 public void onInitializeAccessibilityNodeInfo(View host, AccessibilityNodeInfo info) { 17286 host.onInitializeAccessibilityNodeInfoInternal(info); 17287 } 17288 17289 /** 17290 * Called when a child of the host View has requested sending an 17291 * {@link AccessibilityEvent} and gives an opportunity to the parent (the host) 17292 * to augment the event. 17293 * <p> 17294 * The default implementation behaves as 17295 * {@link ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17296 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent)} for 17297 * the case of no accessibility delegate been set. 17298 * </p> 17299 * 17300 * @param host The View hosting the delegate. 17301 * @param child The child which requests sending the event. 17302 * @param event The event to be sent. 17303 * @return True if the event should be sent 17304 * 17305 * @see ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17306 * ViewGroup#onRequestSendAccessibilityEvent(View, AccessibilityEvent) 17307 */ 17308 public boolean onRequestSendAccessibilityEvent(ViewGroup host, View child, 17309 AccessibilityEvent event) { 17310 return host.onRequestSendAccessibilityEventInternal(child, event); 17311 } 17312 17313 /** 17314 * Gets the provider for managing a virtual view hierarchy rooted at this View 17315 * and reported to {@link android.accessibilityservice.AccessibilityService}s 17316 * that explore the window content. 17317 * <p> 17318 * The default implementation behaves as 17319 * {@link View#getAccessibilityNodeProvider() View#getAccessibilityNodeProvider()} for 17320 * the case of no accessibility delegate been set. 17321 * </p> 17322 * 17323 * @return The provider. 17324 * 17325 * @see AccessibilityNodeProvider 17326 */ 17327 public AccessibilityNodeProvider getAccessibilityNodeProvider(View host) { 17328 return null; 17329 } 17330 } 17331} 17332