View.java revision f28595e47d7a2712df3e2d2e7b6591d1333add3b
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 com.android.internal.R; 20import com.android.internal.util.Predicate; 21import com.android.internal.view.menu.MenuBuilder; 22 23import android.content.ClipData; 24import android.content.Context; 25import android.content.res.Configuration; 26import android.content.res.Resources; 27import android.content.res.TypedArray; 28import android.graphics.Bitmap; 29import android.graphics.Camera; 30import android.graphics.Canvas; 31import android.graphics.Interpolator; 32import android.graphics.LinearGradient; 33import android.graphics.Matrix; 34import android.graphics.Paint; 35import android.graphics.PixelFormat; 36import android.graphics.Point; 37import android.graphics.PorterDuff; 38import android.graphics.PorterDuffXfermode; 39import android.graphics.Rect; 40import android.graphics.RectF; 41import android.graphics.Region; 42import android.graphics.Shader; 43import android.graphics.drawable.ColorDrawable; 44import android.graphics.drawable.Drawable; 45import android.os.Handler; 46import android.os.IBinder; 47import android.os.Message; 48import android.os.Parcel; 49import android.os.Parcelable; 50import android.os.RemoteException; 51import android.os.SystemClock; 52import android.os.SystemProperties; 53import android.util.AttributeSet; 54import android.util.Log; 55import android.util.Pool; 56import android.util.Poolable; 57import android.util.PoolableManager; 58import android.util.Pools; 59import android.util.SparseArray; 60import android.view.ContextMenu.ContextMenuInfo; 61import android.view.accessibility.AccessibilityEvent; 62import android.view.accessibility.AccessibilityEventSource; 63import android.view.accessibility.AccessibilityManager; 64import android.view.animation.Animation; 65import android.view.animation.AnimationUtils; 66import android.view.inputmethod.EditorInfo; 67import android.view.inputmethod.InputConnection; 68import android.view.inputmethod.InputMethodManager; 69import android.widget.ScrollBarDrawable; 70 71import java.lang.ref.WeakReference; 72import java.lang.reflect.InvocationTargetException; 73import java.lang.reflect.Method; 74import java.util.ArrayList; 75import java.util.Arrays; 76import java.util.List; 77import java.util.WeakHashMap; 78 79/** 80 * <p> 81 * This class represents the basic building block for user interface components. A View 82 * occupies a rectangular area on the screen and is responsible for drawing and 83 * event handling. View is the base class for <em>widgets</em>, which are 84 * used to create interactive UI components (buttons, text fields, etc.). The 85 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 86 * are invisible containers that hold other Views (or other ViewGroups) and define 87 * their layout properties. 88 * </p> 89 * 90 * <div class="special"> 91 * <p>For an introduction to using this class to develop your 92 * application's user interface, read the Developer Guide documentation on 93 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 94 * include: 95 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 96 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 97 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 98 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 99 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 100 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 103 * </p> 104 * </div> 105 * 106 * <a name="Using"></a> 107 * <h3>Using Views</h3> 108 * <p> 109 * All of the views in a window are arranged in a single tree. You can add views 110 * either from code or by specifying a tree of views in one or more XML layout 111 * files. There are many specialized subclasses of views that act as controls or 112 * are capable of displaying text, images, or other content. 113 * </p> 114 * <p> 115 * Once you have created a tree of views, there are typically a few types of 116 * common operations you may wish to perform: 117 * <ul> 118 * <li><strong>Set properties:</strong> for example setting the text of a 119 * {@link android.widget.TextView}. The available properties and the methods 120 * that set them will vary among the different subclasses of views. Note that 121 * properties that are known at build time can be set in the XML layout 122 * files.</li> 123 * <li><strong>Set focus:</strong> The framework will handled moving focus in 124 * response to user input. To force focus to a specific view, call 125 * {@link #requestFocus}.</li> 126 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 127 * that will be notified when something interesting happens to the view. For 128 * example, all views will let you set a listener to be notified when the view 129 * gains or loses focus. You can register such a listener using 130 * {@link #setOnFocusChangeListener}. Other view subclasses offer more 131 * specialized listeners. For example, a Button exposes a listener to notify 132 * clients when the button is clicked.</li> 133 * <li><strong>Set visibility:</strong> You can hide or show views using 134 * {@link #setVisibility}.</li> 135 * </ul> 136 * </p> 137 * <p><em> 138 * Note: The Android framework is responsible for measuring, laying out and 139 * drawing views. You should not call methods that perform these actions on 140 * views yourself unless you are actually implementing a 141 * {@link android.view.ViewGroup}. 142 * </em></p> 143 * 144 * <a name="Lifecycle"></a> 145 * <h3>Implementing a Custom View</h3> 146 * 147 * <p> 148 * To implement a custom view, you will usually begin by providing overrides for 149 * some of the standard methods that the framework calls on all views. You do 150 * not need to override all of these methods. In fact, you can start by just 151 * overriding {@link #onDraw(android.graphics.Canvas)}. 152 * <table border="2" width="85%" align="center" cellpadding="5"> 153 * <thead> 154 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 155 * </thead> 156 * 157 * <tbody> 158 * <tr> 159 * <td rowspan="2">Creation</td> 160 * <td>Constructors</td> 161 * <td>There is a form of the constructor that are called when the view 162 * is created from code and a form that is called when the view is 163 * inflated from a layout file. The second form should parse and apply 164 * any attributes defined in the layout file. 165 * </td> 166 * </tr> 167 * <tr> 168 * <td><code>{@link #onFinishInflate()}</code></td> 169 * <td>Called after a view and all of its children has been inflated 170 * from XML.</td> 171 * </tr> 172 * 173 * <tr> 174 * <td rowspan="3">Layout</td> 175 * <td><code>{@link #onMeasure}</code></td> 176 * <td>Called to determine the size requirements for this view and all 177 * of its children. 178 * </td> 179 * </tr> 180 * <tr> 181 * <td><code>{@link #onLayout}</code></td> 182 * <td>Called when this view should assign a size and position to all 183 * of its children. 184 * </td> 185 * </tr> 186 * <tr> 187 * <td><code>{@link #onSizeChanged}</code></td> 188 * <td>Called when the size of this view has changed. 189 * </td> 190 * </tr> 191 * 192 * <tr> 193 * <td>Drawing</td> 194 * <td><code>{@link #onDraw}</code></td> 195 * <td>Called when the view should render its content. 196 * </td> 197 * </tr> 198 * 199 * <tr> 200 * <td rowspan="4">Event processing</td> 201 * <td><code>{@link #onKeyDown}</code></td> 202 * <td>Called when a new key event occurs. 203 * </td> 204 * </tr> 205 * <tr> 206 * <td><code>{@link #onKeyUp}</code></td> 207 * <td>Called when a key up event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onTrackballEvent}</code></td> 212 * <td>Called when a trackball motion event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTouchEvent}</code></td> 217 * <td>Called when a touch screen motion event occurs. 218 * </td> 219 * </tr> 220 * 221 * <tr> 222 * <td rowspan="2">Focus</td> 223 * <td><code>{@link #onFocusChanged}</code></td> 224 * <td>Called when the view gains or loses focus. 225 * </td> 226 * </tr> 227 * 228 * <tr> 229 * <td><code>{@link #onWindowFocusChanged}</code></td> 230 * <td>Called when the window containing the view gains or loses focus. 231 * </td> 232 * </tr> 233 * 234 * <tr> 235 * <td rowspan="3">Attaching</td> 236 * <td><code>{@link #onAttachedToWindow()}</code></td> 237 * <td>Called when the view is attached to a window. 238 * </td> 239 * </tr> 240 * 241 * <tr> 242 * <td><code>{@link #onDetachedFromWindow}</code></td> 243 * <td>Called when the view is detached from its window. 244 * </td> 245 * </tr> 246 * 247 * <tr> 248 * <td><code>{@link #onWindowVisibilityChanged}</code></td> 249 * <td>Called when the visibility of the window containing the view 250 * has changed. 251 * </td> 252 * </tr> 253 * </tbody> 254 * 255 * </table> 256 * </p> 257 * 258 * <a name="IDs"></a> 259 * <h3>IDs</h3> 260 * Views may have an integer id associated with them. These ids are typically 261 * assigned in the layout XML files, and are used to find specific views within 262 * the view tree. A common pattern is to: 263 * <ul> 264 * <li>Define a Button in the layout file and assign it a unique ID. 265 * <pre> 266 * <Button 267 * android:id="@+id/my_button" 268 * android:layout_width="wrap_content" 269 * android:layout_height="wrap_content" 270 * android:text="@string/my_button_text"/> 271 * </pre></li> 272 * <li>From the onCreate method of an Activity, find the Button 273 * <pre class="prettyprint"> 274 * Button myButton = (Button) findViewById(R.id.my_button); 275 * </pre></li> 276 * </ul> 277 * <p> 278 * View IDs need not be unique throughout the tree, but it is good practice to 279 * ensure that they are at least unique within the part of the tree you are 280 * searching. 281 * </p> 282 * 283 * <a name="Position"></a> 284 * <h3>Position</h3> 285 * <p> 286 * The geometry of a view is that of a rectangle. A view has a location, 287 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 288 * two dimensions, expressed as a width and a height. The unit for location 289 * and dimensions is the pixel. 290 * </p> 291 * 292 * <p> 293 * It is possible to retrieve the location of a view by invoking the methods 294 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 295 * coordinate of the rectangle representing the view. The latter returns the 296 * top, or Y, coordinate of the rectangle representing the view. These methods 297 * both return the location of the view relative to its parent. For instance, 298 * when getLeft() returns 20, that means the view is located 20 pixels to the 299 * right of the left edge of its direct parent. 300 * </p> 301 * 302 * <p> 303 * In addition, several convenience methods are offered to avoid unnecessary 304 * computations, namely {@link #getRight()} and {@link #getBottom()}. 305 * These methods return the coordinates of the right and bottom edges of the 306 * rectangle representing the view. For instance, calling {@link #getRight()} 307 * is similar to the following computation: <code>getLeft() + getWidth()</code> 308 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 309 * </p> 310 * 311 * <a name="SizePaddingMargins"></a> 312 * <h3>Size, padding and margins</h3> 313 * <p> 314 * The size of a view is expressed with a width and a height. A view actually 315 * possess two pairs of width and height values. 316 * </p> 317 * 318 * <p> 319 * The first pair is known as <em>measured width</em> and 320 * <em>measured height</em>. These dimensions define how big a view wants to be 321 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 322 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 323 * and {@link #getMeasuredHeight()}. 324 * </p> 325 * 326 * <p> 327 * The second pair is simply known as <em>width</em> and <em>height</em>, or 328 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 329 * dimensions define the actual size of the view on screen, at drawing time and 330 * after layout. These values may, but do not have to, be different from the 331 * measured width and height. The width and height can be obtained by calling 332 * {@link #getWidth()} and {@link #getHeight()}. 333 * </p> 334 * 335 * <p> 336 * To measure its dimensions, a view takes into account its padding. The padding 337 * is expressed in pixels for the left, top, right and bottom parts of the view. 338 * Padding can be used to offset the content of the view by a specific amount of 339 * pixels. For instance, a left padding of 2 will push the view's content by 340 * 2 pixels to the right of the left edge. Padding can be set using the 341 * {@link #setPadding(int, int, int, int)} method and queried by calling 342 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 343 * {@link #getPaddingRight()} and {@link #getPaddingBottom()}. 344 * </p> 345 * 346 * <p> 347 * Even though a view can define a padding, it does not provide any support for 348 * margins. However, view groups provide such a support. Refer to 349 * {@link android.view.ViewGroup} and 350 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 351 * </p> 352 * 353 * <a name="Layout"></a> 354 * <h3>Layout</h3> 355 * <p> 356 * Layout is a two pass process: a measure pass and a layout pass. The measuring 357 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 358 * of the view tree. Each view pushes dimension specifications down the tree 359 * during the recursion. At the end of the measure pass, every view has stored 360 * its measurements. The second pass happens in 361 * {@link #layout(int,int,int,int)} and is also top-down. During 362 * this pass each parent is responsible for positioning all of its children 363 * using the sizes computed in the measure pass. 364 * </p> 365 * 366 * <p> 367 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 368 * {@link #getMeasuredHeight()} values must be set, along with those for all of 369 * that view's descendants. A view's measured width and measured height values 370 * must respect the constraints imposed by the view's parents. This guarantees 371 * that at the end of the measure pass, all parents accept all of their 372 * children's measurements. A parent view may call measure() more than once on 373 * its children. For example, the parent may measure each child once with 374 * unspecified dimensions to find out how big they want to be, then call 375 * measure() on them again with actual numbers if the sum of all the children's 376 * unconstrained sizes is too big or too small. 377 * </p> 378 * 379 * <p> 380 * The measure pass uses two classes to communicate dimensions. The 381 * {@link MeasureSpec} class is used by views to tell their parents how they 382 * want to be measured and positioned. The base LayoutParams class just 383 * describes how big the view wants to be for both width and height. For each 384 * dimension, it can specify one of: 385 * <ul> 386 * <li> an exact number 387 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 388 * (minus padding) 389 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 390 * enclose its content (plus padding). 391 * </ul> 392 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 393 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 394 * an X and Y value. 395 * </p> 396 * 397 * <p> 398 * MeasureSpecs are used to push requirements down the tree from parent to 399 * child. A MeasureSpec can be in one of three modes: 400 * <ul> 401 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 402 * of a child view. For example, a LinearLayout may call measure() on its child 403 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 404 * tall the child view wants to be given a width of 240 pixels. 405 * <li>EXACTLY: This is used by the parent to impose an exact size on the 406 * child. The child must use this size, and guarantee that all of its 407 * descendants will fit within this size. 408 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 409 * child. The child must gurantee that it and all of its descendants will fit 410 * within this size. 411 * </ul> 412 * </p> 413 * 414 * <p> 415 * To intiate a layout, call {@link #requestLayout}. This method is typically 416 * called by a view on itself when it believes that is can no longer fit within 417 * its current bounds. 418 * </p> 419 * 420 * <a name="Drawing"></a> 421 * <h3>Drawing</h3> 422 * <p> 423 * Drawing is handled by walking the tree and rendering each view that 424 * intersects the the invalid region. Because the tree is traversed in-order, 425 * this means that parents will draw before (i.e., behind) their children, with 426 * siblings drawn in the order they appear in the tree. 427 * If you set a background drawable for a View, then the View will draw it for you 428 * before calling back to its <code>onDraw()</code> method. 429 * </p> 430 * 431 * <p> 432 * Note that the framework will not draw views that are not in the invalid region. 433 * </p> 434 * 435 * <p> 436 * To force a view to draw, call {@link #invalidate()}. 437 * </p> 438 * 439 * <a name="EventHandlingThreading"></a> 440 * <h3>Event Handling and Threading</h3> 441 * <p> 442 * The basic cycle of a view is as follows: 443 * <ol> 444 * <li>An event comes in and is dispatched to the appropriate view. The view 445 * handles the event and notifies any listeners.</li> 446 * <li>If in the course of processing the event, the view's bounds may need 447 * to be changed, the view will call {@link #requestLayout()}.</li> 448 * <li>Similarly, if in the course of processing the event the view's appearance 449 * may need to be changed, the view will call {@link #invalidate()}.</li> 450 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 451 * the framework will take care of measuring, laying out, and drawing the tree 452 * as appropriate.</li> 453 * </ol> 454 * </p> 455 * 456 * <p><em>Note: The entire view tree is single threaded. You must always be on 457 * the UI thread when calling any method on any view.</em> 458 * If you are doing work on other threads and want to update the state of a view 459 * from that thread, you should use a {@link Handler}. 460 * </p> 461 * 462 * <a name="FocusHandling"></a> 463 * <h3>Focus Handling</h3> 464 * <p> 465 * The framework will handle routine focus movement in response to user input. 466 * This includes changing the focus as views are removed or hidden, or as new 467 * views become available. Views indicate their willingness to take focus 468 * through the {@link #isFocusable} method. To change whether a view can take 469 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 470 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 471 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 472 * </p> 473 * <p> 474 * Focus movement is based on an algorithm which finds the nearest neighbor in a 475 * given direction. In rare cases, the default algorithm may not match the 476 * intended behavior of the developer. In these situations, you can provide 477 * explicit overrides by using these XML attributes in the layout file: 478 * <pre> 479 * nextFocusDown 480 * nextFocusLeft 481 * nextFocusRight 482 * nextFocusUp 483 * </pre> 484 * </p> 485 * 486 * 487 * <p> 488 * To get a particular view to take focus, call {@link #requestFocus()}. 489 * </p> 490 * 491 * <a name="TouchMode"></a> 492 * <h3>Touch Mode</h3> 493 * <p> 494 * When a user is navigating a user interface via directional keys such as a D-pad, it is 495 * necessary to give focus to actionable items such as buttons so the user can see 496 * what will take input. If the device has touch capabilities, however, and the user 497 * begins interacting with the interface by touching it, it is no longer necessary to 498 * always highlight, or give focus to, a particular view. This motivates a mode 499 * for interaction named 'touch mode'. 500 * </p> 501 * <p> 502 * For a touch capable device, once the user touches the screen, the device 503 * will enter touch mode. From this point onward, only views for which 504 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 505 * Other views that are touchable, like buttons, will not take focus when touched; they will 506 * only fire the on click listeners. 507 * </p> 508 * <p> 509 * Any time a user hits a directional key, such as a D-pad direction, the view device will 510 * exit touch mode, and find a view to take focus, so that the user may resume interacting 511 * with the user interface without touching the screen again. 512 * </p> 513 * <p> 514 * The touch mode state is maintained across {@link android.app.Activity}s. Call 515 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 516 * </p> 517 * 518 * <a name="Scrolling"></a> 519 * <h3>Scrolling</h3> 520 * <p> 521 * The framework provides basic support for views that wish to internally 522 * scroll their content. This includes keeping track of the X and Y scroll 523 * offset as well as mechanisms for drawing scrollbars. See 524 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 525 * {@link #awakenScrollBars()} for more details. 526 * </p> 527 * 528 * <a name="Tags"></a> 529 * <h3>Tags</h3> 530 * <p> 531 * Unlike IDs, tags are not used to identify views. Tags are essentially an 532 * extra piece of information that can be associated with a view. They are most 533 * often used as a convenience to store data related to views in the views 534 * themselves rather than by putting them in a separate structure. 535 * </p> 536 * 537 * <a name="Animation"></a> 538 * <h3>Animation</h3> 539 * <p> 540 * You can attach an {@link Animation} object to a view using 541 * {@link #setAnimation(Animation)} or 542 * {@link #startAnimation(Animation)}. The animation can alter the scale, 543 * rotation, translation and alpha of a view over time. If the animation is 544 * attached to a view that has children, the animation will affect the entire 545 * subtree rooted by that node. When an animation is started, the framework will 546 * take care of redrawing the appropriate views until the animation completes. 547 * </p> 548 * <p> 549 * Starting with Android 3.0, the preferred way of animating views is to use the 550 * {@link android.animation} package APIs. 551 * </p> 552 * 553 * <a name="Security"></a> 554 * <h3>Security</h3> 555 * <p> 556 * Sometimes it is essential that an application be able to verify that an action 557 * is being performed with the full knowledge and consent of the user, such as 558 * granting a permission request, making a purchase or clicking on an advertisement. 559 * Unfortunately, a malicious application could try to spoof the user into 560 * performing these actions, unaware, by concealing the intended purpose of the view. 561 * As a remedy, the framework offers a touch filtering mechanism that can be used to 562 * improve the security of views that provide access to sensitive functionality. 563 * </p><p> 564 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured} or set the 565 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 566 * will discard touches that are received whenever the view's window is obscured by 567 * another visible window. As a result, the view will not receive touches whenever a 568 * toast, dialog or other window appears above the view's window. 569 * </p><p> 570 * For more fine-grained control over security, consider overriding the 571 * {@link #onFilterTouchEventForSecurity} method to implement your own security policy. 572 * See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 573 * </p> 574 * 575 * @attr ref android.R.styleable#View_alpha 576 * @attr ref android.R.styleable#View_background 577 * @attr ref android.R.styleable#View_clickable 578 * @attr ref android.R.styleable#View_contentDescription 579 * @attr ref android.R.styleable#View_drawingCacheQuality 580 * @attr ref android.R.styleable#View_duplicateParentState 581 * @attr ref android.R.styleable#View_id 582 * @attr ref android.R.styleable#View_fadingEdge 583 * @attr ref android.R.styleable#View_fadingEdgeLength 584 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 585 * @attr ref android.R.styleable#View_fitsSystemWindows 586 * @attr ref android.R.styleable#View_isScrollContainer 587 * @attr ref android.R.styleable#View_focusable 588 * @attr ref android.R.styleable#View_focusableInTouchMode 589 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 590 * @attr ref android.R.styleable#View_keepScreenOn 591 * @attr ref android.R.styleable#View_layerType 592 * @attr ref android.R.styleable#View_longClickable 593 * @attr ref android.R.styleable#View_minHeight 594 * @attr ref android.R.styleable#View_minWidth 595 * @attr ref android.R.styleable#View_nextFocusDown 596 * @attr ref android.R.styleable#View_nextFocusLeft 597 * @attr ref android.R.styleable#View_nextFocusRight 598 * @attr ref android.R.styleable#View_nextFocusUp 599 * @attr ref android.R.styleable#View_onClick 600 * @attr ref android.R.styleable#View_padding 601 * @attr ref android.R.styleable#View_paddingBottom 602 * @attr ref android.R.styleable#View_paddingLeft 603 * @attr ref android.R.styleable#View_paddingRight 604 * @attr ref android.R.styleable#View_paddingTop 605 * @attr ref android.R.styleable#View_saveEnabled 606 * @attr ref android.R.styleable#View_rotation 607 * @attr ref android.R.styleable#View_rotationX 608 * @attr ref android.R.styleable#View_rotationY 609 * @attr ref android.R.styleable#View_scaleX 610 * @attr ref android.R.styleable#View_scaleY 611 * @attr ref android.R.styleable#View_scrollX 612 * @attr ref android.R.styleable#View_scrollY 613 * @attr ref android.R.styleable#View_scrollbarSize 614 * @attr ref android.R.styleable#View_scrollbarStyle 615 * @attr ref android.R.styleable#View_scrollbars 616 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 617 * @attr ref android.R.styleable#View_scrollbarFadeDuration 618 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 619 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 620 * @attr ref android.R.styleable#View_scrollbarThumbVertical 621 * @attr ref android.R.styleable#View_scrollbarTrackVertical 622 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 623 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 624 * @attr ref android.R.styleable#View_soundEffectsEnabled 625 * @attr ref android.R.styleable#View_tag 626 * @attr ref android.R.styleable#View_transformPivotX 627 * @attr ref android.R.styleable#View_transformPivotY 628 * @attr ref android.R.styleable#View_translationX 629 * @attr ref android.R.styleable#View_translationY 630 * @attr ref android.R.styleable#View_visibility 631 * 632 * @see android.view.ViewGroup 633 */ 634public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource { 635 private static final boolean DBG = false; 636 637 /** 638 * The logging tag used by this class with android.util.Log. 639 */ 640 protected static final String VIEW_LOG_TAG = "View"; 641 642 /** 643 * Used to mark a View that has no ID. 644 */ 645 public static final int NO_ID = -1; 646 647 /** 648 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 649 * calling setFlags. 650 */ 651 private static final int NOT_FOCUSABLE = 0x00000000; 652 653 /** 654 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 655 * setFlags. 656 */ 657 private static final int FOCUSABLE = 0x00000001; 658 659 /** 660 * Mask for use with setFlags indicating bits used for focus. 661 */ 662 private static final int FOCUSABLE_MASK = 0x00000001; 663 664 /** 665 * This view will adjust its padding to fit sytem windows (e.g. status bar) 666 */ 667 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 668 669 /** 670 * This view is visible. Use with {@link #setVisibility}. 671 */ 672 public static final int VISIBLE = 0x00000000; 673 674 /** 675 * This view is invisible, but it still takes up space for layout purposes. 676 * Use with {@link #setVisibility}. 677 */ 678 public static final int INVISIBLE = 0x00000004; 679 680 /** 681 * This view is invisible, and it doesn't take any space for layout 682 * purposes. Use with {@link #setVisibility}. 683 */ 684 public static final int GONE = 0x00000008; 685 686 /** 687 * Mask for use with setFlags indicating bits used for visibility. 688 * {@hide} 689 */ 690 static final int VISIBILITY_MASK = 0x0000000C; 691 692 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 693 694 /** 695 * This view is enabled. Intrepretation varies by subclass. 696 * Use with ENABLED_MASK when calling setFlags. 697 * {@hide} 698 */ 699 static final int ENABLED = 0x00000000; 700 701 /** 702 * This view is disabled. Intrepretation varies by subclass. 703 * Use with ENABLED_MASK when calling setFlags. 704 * {@hide} 705 */ 706 static final int DISABLED = 0x00000020; 707 708 /** 709 * Mask for use with setFlags indicating bits used for indicating whether 710 * this view is enabled 711 * {@hide} 712 */ 713 static final int ENABLED_MASK = 0x00000020; 714 715 /** 716 * This view won't draw. {@link #onDraw} won't be called and further 717 * optimizations 718 * will be performed. It is okay to have this flag set and a background. 719 * Use with DRAW_MASK when calling setFlags. 720 * {@hide} 721 */ 722 static final int WILL_NOT_DRAW = 0x00000080; 723 724 /** 725 * Mask for use with setFlags indicating bits used for indicating whether 726 * this view is will draw 727 * {@hide} 728 */ 729 static final int DRAW_MASK = 0x00000080; 730 731 /** 732 * <p>This view doesn't show scrollbars.</p> 733 * {@hide} 734 */ 735 static final int SCROLLBARS_NONE = 0x00000000; 736 737 /** 738 * <p>This view shows horizontal scrollbars.</p> 739 * {@hide} 740 */ 741 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 742 743 /** 744 * <p>This view shows vertical scrollbars.</p> 745 * {@hide} 746 */ 747 static final int SCROLLBARS_VERTICAL = 0x00000200; 748 749 /** 750 * <p>Mask for use with setFlags indicating bits used for indicating which 751 * scrollbars are enabled.</p> 752 * {@hide} 753 */ 754 static final int SCROLLBARS_MASK = 0x00000300; 755 756 /** 757 * Indicates that the view should filter touches when its window is obscured. 758 * Refer to the class comments for more information about this security feature. 759 * {@hide} 760 */ 761 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 762 763 // note flag value 0x00000800 is now available for next flags... 764 765 /** 766 * <p>This view doesn't show fading edges.</p> 767 * {@hide} 768 */ 769 static final int FADING_EDGE_NONE = 0x00000000; 770 771 /** 772 * <p>This view shows horizontal fading edges.</p> 773 * {@hide} 774 */ 775 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 776 777 /** 778 * <p>This view shows vertical fading edges.</p> 779 * {@hide} 780 */ 781 static final int FADING_EDGE_VERTICAL = 0x00002000; 782 783 /** 784 * <p>Mask for use with setFlags indicating bits used for indicating which 785 * fading edges are enabled.</p> 786 * {@hide} 787 */ 788 static final int FADING_EDGE_MASK = 0x00003000; 789 790 /** 791 * <p>Indicates this view can be clicked. When clickable, a View reacts 792 * to clicks by notifying the OnClickListener.<p> 793 * {@hide} 794 */ 795 static final int CLICKABLE = 0x00004000; 796 797 /** 798 * <p>Indicates this view is caching its drawing into a bitmap.</p> 799 * {@hide} 800 */ 801 static final int DRAWING_CACHE_ENABLED = 0x00008000; 802 803 /** 804 * <p>Indicates that no icicle should be saved for this view.<p> 805 * {@hide} 806 */ 807 static final int SAVE_DISABLED = 0x000010000; 808 809 /** 810 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 811 * property.</p> 812 * {@hide} 813 */ 814 static final int SAVE_DISABLED_MASK = 0x000010000; 815 816 /** 817 * <p>Indicates that no drawing cache should ever be created for this view.<p> 818 * {@hide} 819 */ 820 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 821 822 /** 823 * <p>Indicates this view can take / keep focus when int touch mode.</p> 824 * {@hide} 825 */ 826 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 827 828 /** 829 * <p>Enables low quality mode for the drawing cache.</p> 830 */ 831 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 832 833 /** 834 * <p>Enables high quality mode for the drawing cache.</p> 835 */ 836 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 837 838 /** 839 * <p>Enables automatic quality mode for the drawing cache.</p> 840 */ 841 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 842 843 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 844 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 845 }; 846 847 /** 848 * <p>Mask for use with setFlags indicating bits used for the cache 849 * quality property.</p> 850 * {@hide} 851 */ 852 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 853 854 /** 855 * <p> 856 * Indicates this view can be long clicked. When long clickable, a View 857 * reacts to long clicks by notifying the OnLongClickListener or showing a 858 * context menu. 859 * </p> 860 * {@hide} 861 */ 862 static final int LONG_CLICKABLE = 0x00200000; 863 864 /** 865 * <p>Indicates that this view gets its drawable states from its direct parent 866 * and ignores its original internal states.</p> 867 * 868 * @hide 869 */ 870 static final int DUPLICATE_PARENT_STATE = 0x00400000; 871 872 /** 873 * The scrollbar style to display the scrollbars inside the content area, 874 * without increasing the padding. The scrollbars will be overlaid with 875 * translucency on the view's content. 876 */ 877 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 878 879 /** 880 * The scrollbar style to display the scrollbars inside the padded area, 881 * increasing the padding of the view. The scrollbars will not overlap the 882 * content area of the view. 883 */ 884 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 885 886 /** 887 * The scrollbar style to display the scrollbars at the edge of the view, 888 * without increasing the padding. The scrollbars will be overlaid with 889 * translucency. 890 */ 891 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 892 893 /** 894 * The scrollbar style to display the scrollbars at the edge of the view, 895 * increasing the padding of the view. The scrollbars will only overlap the 896 * background, if any. 897 */ 898 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 899 900 /** 901 * Mask to check if the scrollbar style is overlay or inset. 902 * {@hide} 903 */ 904 static final int SCROLLBARS_INSET_MASK = 0x01000000; 905 906 /** 907 * Mask to check if the scrollbar style is inside or outside. 908 * {@hide} 909 */ 910 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 911 912 /** 913 * Mask for scrollbar style. 914 * {@hide} 915 */ 916 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 917 918 /** 919 * View flag indicating that the screen should remain on while the 920 * window containing this view is visible to the user. This effectively 921 * takes care of automatically setting the WindowManager's 922 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 923 */ 924 public static final int KEEP_SCREEN_ON = 0x04000000; 925 926 /** 927 * View flag indicating whether this view should have sound effects enabled 928 * for events such as clicking and touching. 929 */ 930 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 931 932 /** 933 * View flag indicating whether this view should have haptic feedback 934 * enabled for events such as long presses. 935 */ 936 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 937 938 /** 939 * <p>Indicates that the view hierarchy should stop saving state when 940 * it reaches this view. If state saving is initiated immediately at 941 * the view, it will be allowed. 942 * {@hide} 943 */ 944 static final int PARENT_SAVE_DISABLED = 0x20000000; 945 946 /** 947 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 948 * {@hide} 949 */ 950 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 951 952 /** 953 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 954 * should add all focusable Views regardless if they are focusable in touch mode. 955 */ 956 public static final int FOCUSABLES_ALL = 0x00000000; 957 958 /** 959 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 960 * should add only Views focusable in touch mode. 961 */ 962 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 963 964 /** 965 * Use with {@link #focusSearch}. Move focus to the previous selectable 966 * item. 967 */ 968 public static final int FOCUS_BACKWARD = 0x00000001; 969 970 /** 971 * Use with {@link #focusSearch}. Move focus to the next selectable 972 * item. 973 */ 974 public static final int FOCUS_FORWARD = 0x00000002; 975 976 /** 977 * Use with {@link #focusSearch}. Move focus to the left. 978 */ 979 public static final int FOCUS_LEFT = 0x00000011; 980 981 /** 982 * Use with {@link #focusSearch}. Move focus up. 983 */ 984 public static final int FOCUS_UP = 0x00000021; 985 986 /** 987 * Use with {@link #focusSearch}. Move focus to the right. 988 */ 989 public static final int FOCUS_RIGHT = 0x00000042; 990 991 /** 992 * Use with {@link #focusSearch}. Move focus down. 993 */ 994 public static final int FOCUS_DOWN = 0x00000082; 995 996 /** 997 * Bits of {@link #getMeasuredWidthAndState()} and 998 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 999 */ 1000 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1001 1002 /** 1003 * Bits of {@link #getMeasuredWidthAndState()} and 1004 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1005 */ 1006 public static final int MEASURED_STATE_MASK = 0xff000000; 1007 1008 /** 1009 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1010 * for functions that combine both width and height into a single int, 1011 * such as {@link #getMeasuredState()} and the childState argument of 1012 * {@link #resolveSizeAndState(int, int, int)}. 1013 */ 1014 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1015 1016 /** 1017 * Bit of {@link #getMeasuredWidthAndState()} and 1018 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1019 * is smaller that the space the view would like to have. 1020 */ 1021 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1022 1023 /** 1024 * Base View state sets 1025 */ 1026 // Singles 1027 /** 1028 * Indicates the view has no states set. States are used with 1029 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1030 * view depending on its state. 1031 * 1032 * @see android.graphics.drawable.Drawable 1033 * @see #getDrawableState() 1034 */ 1035 protected static final int[] EMPTY_STATE_SET; 1036 /** 1037 * Indicates the view is enabled. States are used with 1038 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1039 * view depending on its state. 1040 * 1041 * @see android.graphics.drawable.Drawable 1042 * @see #getDrawableState() 1043 */ 1044 protected static final int[] ENABLED_STATE_SET; 1045 /** 1046 * Indicates the view is focused. States are used with 1047 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1048 * view depending on its state. 1049 * 1050 * @see android.graphics.drawable.Drawable 1051 * @see #getDrawableState() 1052 */ 1053 protected static final int[] FOCUSED_STATE_SET; 1054 /** 1055 * Indicates the view is selected. States are used with 1056 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1057 * view depending on its state. 1058 * 1059 * @see android.graphics.drawable.Drawable 1060 * @see #getDrawableState() 1061 */ 1062 protected static final int[] SELECTED_STATE_SET; 1063 /** 1064 * Indicates the view is pressed. States are used with 1065 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1066 * view depending on its state. 1067 * 1068 * @see android.graphics.drawable.Drawable 1069 * @see #getDrawableState() 1070 * @hide 1071 */ 1072 protected static final int[] PRESSED_STATE_SET; 1073 /** 1074 * Indicates the view's window has focus. States are used with 1075 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1076 * view depending on its state. 1077 * 1078 * @see android.graphics.drawable.Drawable 1079 * @see #getDrawableState() 1080 */ 1081 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1082 // Doubles 1083 /** 1084 * Indicates the view is enabled and has the focus. 1085 * 1086 * @see #ENABLED_STATE_SET 1087 * @see #FOCUSED_STATE_SET 1088 */ 1089 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1090 /** 1091 * Indicates the view is enabled and selected. 1092 * 1093 * @see #ENABLED_STATE_SET 1094 * @see #SELECTED_STATE_SET 1095 */ 1096 protected static final int[] ENABLED_SELECTED_STATE_SET; 1097 /** 1098 * Indicates the view is enabled and that its window has focus. 1099 * 1100 * @see #ENABLED_STATE_SET 1101 * @see #WINDOW_FOCUSED_STATE_SET 1102 */ 1103 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1104 /** 1105 * Indicates the view is focused and selected. 1106 * 1107 * @see #FOCUSED_STATE_SET 1108 * @see #SELECTED_STATE_SET 1109 */ 1110 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1111 /** 1112 * Indicates the view has the focus and that its window has the focus. 1113 * 1114 * @see #FOCUSED_STATE_SET 1115 * @see #WINDOW_FOCUSED_STATE_SET 1116 */ 1117 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1118 /** 1119 * Indicates the view is selected and that its window has the focus. 1120 * 1121 * @see #SELECTED_STATE_SET 1122 * @see #WINDOW_FOCUSED_STATE_SET 1123 */ 1124 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1125 // Triples 1126 /** 1127 * Indicates the view is enabled, focused and selected. 1128 * 1129 * @see #ENABLED_STATE_SET 1130 * @see #FOCUSED_STATE_SET 1131 * @see #SELECTED_STATE_SET 1132 */ 1133 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1134 /** 1135 * Indicates the view is enabled, focused and its window has the focus. 1136 * 1137 * @see #ENABLED_STATE_SET 1138 * @see #FOCUSED_STATE_SET 1139 * @see #WINDOW_FOCUSED_STATE_SET 1140 */ 1141 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1142 /** 1143 * Indicates the view is enabled, selected and its window has the focus. 1144 * 1145 * @see #ENABLED_STATE_SET 1146 * @see #SELECTED_STATE_SET 1147 * @see #WINDOW_FOCUSED_STATE_SET 1148 */ 1149 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1150 /** 1151 * Indicates the view is focused, selected and its window has the focus. 1152 * 1153 * @see #FOCUSED_STATE_SET 1154 * @see #SELECTED_STATE_SET 1155 * @see #WINDOW_FOCUSED_STATE_SET 1156 */ 1157 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1158 /** 1159 * Indicates the view is enabled, focused, selected and its window 1160 * has the focus. 1161 * 1162 * @see #ENABLED_STATE_SET 1163 * @see #FOCUSED_STATE_SET 1164 * @see #SELECTED_STATE_SET 1165 * @see #WINDOW_FOCUSED_STATE_SET 1166 */ 1167 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1168 /** 1169 * Indicates the view is pressed and its window has the focus. 1170 * 1171 * @see #PRESSED_STATE_SET 1172 * @see #WINDOW_FOCUSED_STATE_SET 1173 */ 1174 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1175 /** 1176 * Indicates the view is pressed and selected. 1177 * 1178 * @see #PRESSED_STATE_SET 1179 * @see #SELECTED_STATE_SET 1180 */ 1181 protected static final int[] PRESSED_SELECTED_STATE_SET; 1182 /** 1183 * Indicates the view is pressed, selected and its window has the focus. 1184 * 1185 * @see #PRESSED_STATE_SET 1186 * @see #SELECTED_STATE_SET 1187 * @see #WINDOW_FOCUSED_STATE_SET 1188 */ 1189 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1190 /** 1191 * Indicates the view is pressed and focused. 1192 * 1193 * @see #PRESSED_STATE_SET 1194 * @see #FOCUSED_STATE_SET 1195 */ 1196 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1197 /** 1198 * Indicates the view is pressed, focused and its window has the focus. 1199 * 1200 * @see #PRESSED_STATE_SET 1201 * @see #FOCUSED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is pressed, focused and selected. 1207 * 1208 * @see #PRESSED_STATE_SET 1209 * @see #SELECTED_STATE_SET 1210 * @see #FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1213 /** 1214 * Indicates the view is pressed, focused, selected and its window has the focus. 1215 * 1216 * @see #PRESSED_STATE_SET 1217 * @see #FOCUSED_STATE_SET 1218 * @see #SELECTED_STATE_SET 1219 * @see #WINDOW_FOCUSED_STATE_SET 1220 */ 1221 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1222 /** 1223 * Indicates the view is pressed and enabled. 1224 * 1225 * @see #PRESSED_STATE_SET 1226 * @see #ENABLED_STATE_SET 1227 */ 1228 protected static final int[] PRESSED_ENABLED_STATE_SET; 1229 /** 1230 * Indicates the view is pressed, enabled and its window has the focus. 1231 * 1232 * @see #PRESSED_STATE_SET 1233 * @see #ENABLED_STATE_SET 1234 * @see #WINDOW_FOCUSED_STATE_SET 1235 */ 1236 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1237 /** 1238 * Indicates the view is pressed, enabled and selected. 1239 * 1240 * @see #PRESSED_STATE_SET 1241 * @see #ENABLED_STATE_SET 1242 * @see #SELECTED_STATE_SET 1243 */ 1244 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1245 /** 1246 * Indicates the view is pressed, enabled, selected and its window has the 1247 * focus. 1248 * 1249 * @see #PRESSED_STATE_SET 1250 * @see #ENABLED_STATE_SET 1251 * @see #SELECTED_STATE_SET 1252 * @see #WINDOW_FOCUSED_STATE_SET 1253 */ 1254 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1255 /** 1256 * Indicates the view is pressed, enabled and focused. 1257 * 1258 * @see #PRESSED_STATE_SET 1259 * @see #ENABLED_STATE_SET 1260 * @see #FOCUSED_STATE_SET 1261 */ 1262 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1263 /** 1264 * Indicates the view is pressed, enabled, focused and its window has the 1265 * focus. 1266 * 1267 * @see #PRESSED_STATE_SET 1268 * @see #ENABLED_STATE_SET 1269 * @see #FOCUSED_STATE_SET 1270 * @see #WINDOW_FOCUSED_STATE_SET 1271 */ 1272 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1273 /** 1274 * Indicates the view is pressed, enabled, focused and selected. 1275 * 1276 * @see #PRESSED_STATE_SET 1277 * @see #ENABLED_STATE_SET 1278 * @see #SELECTED_STATE_SET 1279 * @see #FOCUSED_STATE_SET 1280 */ 1281 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1282 /** 1283 * Indicates the view is pressed, enabled, focused, selected and its window 1284 * has the focus. 1285 * 1286 * @see #PRESSED_STATE_SET 1287 * @see #ENABLED_STATE_SET 1288 * @see #SELECTED_STATE_SET 1289 * @see #FOCUSED_STATE_SET 1290 * @see #WINDOW_FOCUSED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1293 1294 /** 1295 * The order here is very important to {@link #getDrawableState()} 1296 */ 1297 private static final int[][] VIEW_STATE_SETS; 1298 1299 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1300 static final int VIEW_STATE_SELECTED = 1 << 1; 1301 static final int VIEW_STATE_FOCUSED = 1 << 2; 1302 static final int VIEW_STATE_ENABLED = 1 << 3; 1303 static final int VIEW_STATE_PRESSED = 1 << 4; 1304 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1305 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1306 1307 static final int[] VIEW_STATE_IDS = new int[] { 1308 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1309 R.attr.state_selected, VIEW_STATE_SELECTED, 1310 R.attr.state_focused, VIEW_STATE_FOCUSED, 1311 R.attr.state_enabled, VIEW_STATE_ENABLED, 1312 R.attr.state_pressed, VIEW_STATE_PRESSED, 1313 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1314 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1315 }; 1316 1317 static { 1318 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1319 throw new IllegalStateException( 1320 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1321 } 1322 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1323 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1324 int viewState = R.styleable.ViewDrawableStates[i]; 1325 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1326 if (VIEW_STATE_IDS[j] == viewState) { 1327 orderedIds[i * 2] = viewState; 1328 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1329 } 1330 } 1331 } 1332 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1333 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1334 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1335 int numBits = Integer.bitCount(i); 1336 int[] set = new int[numBits]; 1337 int pos = 0; 1338 for (int j = 0; j < orderedIds.length; j += 2) { 1339 if ((i & orderedIds[j+1]) != 0) { 1340 set[pos++] = orderedIds[j]; 1341 } 1342 } 1343 VIEW_STATE_SETS[i] = set; 1344 } 1345 1346 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1347 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1348 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1349 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1350 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1351 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1352 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1353 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1354 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1355 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1356 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1357 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1358 | VIEW_STATE_FOCUSED]; 1359 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1360 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1361 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1362 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1363 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1364 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1365 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1366 | VIEW_STATE_ENABLED]; 1367 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1368 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1369 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1370 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1371 | VIEW_STATE_ENABLED]; 1372 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1373 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1374 | VIEW_STATE_ENABLED]; 1375 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1376 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1377 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1378 1379 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1380 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1381 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1382 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1383 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1384 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1385 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1386 | VIEW_STATE_PRESSED]; 1387 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1388 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1389 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1390 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1391 | VIEW_STATE_PRESSED]; 1392 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1393 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1394 | VIEW_STATE_PRESSED]; 1395 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1396 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1397 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1398 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1399 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1400 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1401 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1402 | VIEW_STATE_PRESSED]; 1403 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1404 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1405 | VIEW_STATE_PRESSED]; 1406 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1407 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1408 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1409 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1410 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1411 | VIEW_STATE_PRESSED]; 1412 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1413 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1414 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1415 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1417 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1418 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1420 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1421 | VIEW_STATE_PRESSED]; 1422 } 1423 1424 /** 1425 * Used by views that contain lists of items. This state indicates that 1426 * the view is showing the last item. 1427 * @hide 1428 */ 1429 protected static final int[] LAST_STATE_SET = {R.attr.state_last}; 1430 /** 1431 * Used by views that contain lists of items. This state indicates that 1432 * the view is showing the first item. 1433 * @hide 1434 */ 1435 protected static final int[] FIRST_STATE_SET = {R.attr.state_first}; 1436 /** 1437 * Used by views that contain lists of items. This state indicates that 1438 * the view is showing the middle item. 1439 * @hide 1440 */ 1441 protected static final int[] MIDDLE_STATE_SET = {R.attr.state_middle}; 1442 /** 1443 * Used by views that contain lists of items. This state indicates that 1444 * the view is showing only one item. 1445 * @hide 1446 */ 1447 protected static final int[] SINGLE_STATE_SET = {R.attr.state_single}; 1448 /** 1449 * Used by views that contain lists of items. This state indicates that 1450 * the view is pressed and showing the last item. 1451 * @hide 1452 */ 1453 protected static final int[] PRESSED_LAST_STATE_SET = {R.attr.state_last, R.attr.state_pressed}; 1454 /** 1455 * Used by views that contain lists of items. This state indicates that 1456 * the view is pressed and showing the first item. 1457 * @hide 1458 */ 1459 protected static final int[] PRESSED_FIRST_STATE_SET = {R.attr.state_first, R.attr.state_pressed}; 1460 /** 1461 * Used by views that contain lists of items. This state indicates that 1462 * the view is pressed and showing the middle item. 1463 * @hide 1464 */ 1465 protected static final int[] PRESSED_MIDDLE_STATE_SET = {R.attr.state_middle, R.attr.state_pressed}; 1466 /** 1467 * Used by views that contain lists of items. This state indicates that 1468 * the view is pressed and showing only one item. 1469 * @hide 1470 */ 1471 protected static final int[] PRESSED_SINGLE_STATE_SET = {R.attr.state_single, R.attr.state_pressed}; 1472 1473 /** 1474 * Temporary Rect currently for use in setBackground(). This will probably 1475 * be extended in the future to hold our own class with more than just 1476 * a Rect. :) 1477 */ 1478 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1479 1480 /** 1481 * Map used to store views' tags. 1482 */ 1483 private static WeakHashMap<View, SparseArray<Object>> sTags; 1484 1485 /** 1486 * Lock used to access sTags. 1487 */ 1488 private static final Object sTagsLock = new Object(); 1489 1490 /** 1491 * The animation currently associated with this view. 1492 * @hide 1493 */ 1494 protected Animation mCurrentAnimation = null; 1495 1496 /** 1497 * Width as measured during measure pass. 1498 * {@hide} 1499 */ 1500 @ViewDebug.ExportedProperty(category = "measurement") 1501 /*package*/ int mMeasuredWidth; 1502 1503 /** 1504 * Height as measured during measure pass. 1505 * {@hide} 1506 */ 1507 @ViewDebug.ExportedProperty(category = "measurement") 1508 /*package*/ int mMeasuredHeight; 1509 1510 /** 1511 * Flag to indicate that this view was marked INVALIDATED, or had its display list 1512 * invalidated, prior to the current drawing iteration. If true, the view must re-draw 1513 * its display list. This flag, used only when hw accelerated, allows us to clear the 1514 * flag while retaining this information until it's needed (at getDisplayList() time and 1515 * in drawChild(), when we decide to draw a view's children's display lists into our own). 1516 * 1517 * {@hide} 1518 */ 1519 boolean mRecreateDisplayList = false; 1520 1521 /** 1522 * The view's identifier. 1523 * {@hide} 1524 * 1525 * @see #setId(int) 1526 * @see #getId() 1527 */ 1528 @ViewDebug.ExportedProperty(resolveId = true) 1529 int mID = NO_ID; 1530 1531 /** 1532 * The view's tag. 1533 * {@hide} 1534 * 1535 * @see #setTag(Object) 1536 * @see #getTag() 1537 */ 1538 protected Object mTag; 1539 1540 // for mPrivateFlags: 1541 /** {@hide} */ 1542 static final int WANTS_FOCUS = 0x00000001; 1543 /** {@hide} */ 1544 static final int FOCUSED = 0x00000002; 1545 /** {@hide} */ 1546 static final int SELECTED = 0x00000004; 1547 /** {@hide} */ 1548 static final int IS_ROOT_NAMESPACE = 0x00000008; 1549 /** {@hide} */ 1550 static final int HAS_BOUNDS = 0x00000010; 1551 /** {@hide} */ 1552 static final int DRAWN = 0x00000020; 1553 /** 1554 * When this flag is set, this view is running an animation on behalf of its 1555 * children and should therefore not cancel invalidate requests, even if they 1556 * lie outside of this view's bounds. 1557 * 1558 * {@hide} 1559 */ 1560 static final int DRAW_ANIMATION = 0x00000040; 1561 /** {@hide} */ 1562 static final int SKIP_DRAW = 0x00000080; 1563 /** {@hide} */ 1564 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1565 /** {@hide} */ 1566 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1567 /** {@hide} */ 1568 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1569 /** {@hide} */ 1570 static final int MEASURED_DIMENSION_SET = 0x00000800; 1571 /** {@hide} */ 1572 static final int FORCE_LAYOUT = 0x00001000; 1573 /** {@hide} */ 1574 static final int LAYOUT_REQUIRED = 0x00002000; 1575 1576 private static final int PRESSED = 0x00004000; 1577 1578 /** {@hide} */ 1579 static final int DRAWING_CACHE_VALID = 0x00008000; 1580 /** 1581 * Flag used to indicate that this view should be drawn once more (and only once 1582 * more) after its animation has completed. 1583 * {@hide} 1584 */ 1585 static final int ANIMATION_STARTED = 0x00010000; 1586 1587 private static final int SAVE_STATE_CALLED = 0x00020000; 1588 1589 /** 1590 * Indicates that the View returned true when onSetAlpha() was called and that 1591 * the alpha must be restored. 1592 * {@hide} 1593 */ 1594 static final int ALPHA_SET = 0x00040000; 1595 1596 /** 1597 * Set by {@link #setScrollContainer(boolean)}. 1598 */ 1599 static final int SCROLL_CONTAINER = 0x00080000; 1600 1601 /** 1602 * Set by {@link #setScrollContainer(boolean)}. 1603 */ 1604 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1605 1606 /** 1607 * View flag indicating whether this view was invalidated (fully or partially.) 1608 * 1609 * @hide 1610 */ 1611 static final int DIRTY = 0x00200000; 1612 1613 /** 1614 * View flag indicating whether this view was invalidated by an opaque 1615 * invalidate request. 1616 * 1617 * @hide 1618 */ 1619 static final int DIRTY_OPAQUE = 0x00400000; 1620 1621 /** 1622 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1623 * 1624 * @hide 1625 */ 1626 static final int DIRTY_MASK = 0x00600000; 1627 1628 /** 1629 * Indicates whether the background is opaque. 1630 * 1631 * @hide 1632 */ 1633 static final int OPAQUE_BACKGROUND = 0x00800000; 1634 1635 /** 1636 * Indicates whether the scrollbars are opaque. 1637 * 1638 * @hide 1639 */ 1640 static final int OPAQUE_SCROLLBARS = 0x01000000; 1641 1642 /** 1643 * Indicates whether the view is opaque. 1644 * 1645 * @hide 1646 */ 1647 static final int OPAQUE_MASK = 0x01800000; 1648 1649 /** 1650 * Indicates a prepressed state; 1651 * the short time between ACTION_DOWN and recognizing 1652 * a 'real' press. Prepressed is used to recognize quick taps 1653 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1654 * 1655 * @hide 1656 */ 1657 private static final int PREPRESSED = 0x02000000; 1658 1659 /** 1660 * Indicates whether the view is temporarily detached. 1661 * 1662 * @hide 1663 */ 1664 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1665 1666 /** 1667 * Indicates that we should awaken scroll bars once attached 1668 * 1669 * @hide 1670 */ 1671 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1672 1673 /** 1674 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1675 * for transform operations 1676 * 1677 * @hide 1678 */ 1679 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1680 1681 /** {@hide} */ 1682 static final int ACTIVATED = 0x40000000; 1683 1684 /** 1685 * Indicates that this view was specifically invalidated, not just dirtied because some 1686 * child view was invalidated. The flag is used to determine when we need to recreate 1687 * a view's display list (as opposed to just returning a reference to its existing 1688 * display list). 1689 * 1690 * @hide 1691 */ 1692 static final int INVALIDATED = 0x80000000; 1693 1694 /** 1695 * Always allow a user to over-scroll this view, provided it is a 1696 * view that can scroll. 1697 * 1698 * @see #getOverScrollMode() 1699 * @see #setOverScrollMode(int) 1700 */ 1701 public static final int OVER_SCROLL_ALWAYS = 0; 1702 1703 /** 1704 * Allow a user to over-scroll this view only if the content is large 1705 * enough to meaningfully scroll, provided it is a view that can scroll. 1706 * 1707 * @see #getOverScrollMode() 1708 * @see #setOverScrollMode(int) 1709 */ 1710 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1711 1712 /** 1713 * Never allow a user to over-scroll this view. 1714 * 1715 * @see #getOverScrollMode() 1716 * @see #setOverScrollMode(int) 1717 */ 1718 public static final int OVER_SCROLL_NEVER = 2; 1719 1720 /** 1721 * View has requested the status bar to be visible (the default). 1722 * 1723 * @see #setSystemUiVisibility(int) 1724 */ 1725 public static final int STATUS_BAR_VISIBLE = 0; 1726 1727 /** 1728 * View has requested the status bar to be visible (the default). 1729 * 1730 * @see #setSystemUiVisibility(int) 1731 */ 1732 public static final int STATUS_BAR_HIDDEN = 0x00000001; 1733 1734 /** 1735 * @hide 1736 * 1737 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1738 * out of the public fields to keep the undefined bits out of the developer's way. 1739 * 1740 * Flag to make the status bar not expandable. Unless you also 1741 * set {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS}, new notifications will continue to show. 1742 */ 1743 public static final int STATUS_BAR_DISABLE_EXPAND = 0x00010000; 1744 1745 /** 1746 * @hide 1747 * 1748 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1749 * out of the public fields to keep the undefined bits out of the developer's way. 1750 * 1751 * Flag to hide notification icons and scrolling ticker text. 1752 */ 1753 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ICONS = 0x00020000; 1754 1755 /** 1756 * @hide 1757 * 1758 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1759 * out of the public fields to keep the undefined bits out of the developer's way. 1760 * 1761 * Flag to disable incoming notification alerts. This will not block 1762 * icons, but it will block sound, vibrating and other visual or aural notifications. 1763 */ 1764 public static final int STATUS_BAR_DISABLE_NOTIFICATION_ALERTS = 0x00040000; 1765 1766 /** 1767 * @hide 1768 * 1769 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1770 * out of the public fields to keep the undefined bits out of the developer's way. 1771 * 1772 * Flag to hide only the scrolling ticker. Note that 1773 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_ICONS} implies 1774 * {@link #STATUS_BAR_DISABLE_NOTIFICATION_TICKER}. 1775 */ 1776 public static final int STATUS_BAR_DISABLE_NOTIFICATION_TICKER = 0x00080000; 1777 1778 /** 1779 * @hide 1780 * 1781 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1782 * out of the public fields to keep the undefined bits out of the developer's way. 1783 * 1784 * Flag to hide the center system info area. 1785 */ 1786 public static final int STATUS_BAR_DISABLE_SYSTEM_INFO = 0x00100000; 1787 1788 /** 1789 * @hide 1790 * 1791 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1792 * out of the public fields to keep the undefined bits out of the developer's way. 1793 * 1794 * Flag to hide only the navigation buttons. Don't use this 1795 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1796 * 1797 * THIS DOES NOT DISABLE THE BACK BUTTON 1798 */ 1799 public static final int STATUS_BAR_DISABLE_NAVIGATION = 0x00200000; 1800 1801 /** 1802 * @hide 1803 * 1804 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1805 * out of the public fields to keep the undefined bits out of the developer's way. 1806 * 1807 * Flag to hide only the back button. Don't use this 1808 * unless you're a special part of the system UI (i.e., setup wizard, keyguard). 1809 */ 1810 public static final int STATUS_BAR_DISABLE_BACK = 0x00400000; 1811 1812 /** 1813 * @hide 1814 * 1815 * NOTE: This flag may only be used in subtreeSystemUiVisibility. It is masked 1816 * out of the public fields to keep the undefined bits out of the developer's way. 1817 * 1818 * Flag to hide only the clock. You might use this if your activity has 1819 * its own clock making the status bar's clock redundant. 1820 */ 1821 public static final int STATUS_BAR_DISABLE_CLOCK = 0x00800000; 1822 1823 1824 /** 1825 * @hide 1826 */ 1827 public static final int PUBLIC_STATUS_BAR_VISIBILITY_MASK = STATUS_BAR_HIDDEN; 1828 1829 1830 /** 1831 * Controls the over-scroll mode for this view. 1832 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1833 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1834 * and {@link #OVER_SCROLL_NEVER}. 1835 */ 1836 private int mOverScrollMode; 1837 1838 /** 1839 * The parent this view is attached to. 1840 * {@hide} 1841 * 1842 * @see #getParent() 1843 */ 1844 protected ViewParent mParent; 1845 1846 /** 1847 * {@hide} 1848 */ 1849 AttachInfo mAttachInfo; 1850 1851 /** 1852 * {@hide} 1853 */ 1854 @ViewDebug.ExportedProperty(flagMapping = { 1855 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1856 name = "FORCE_LAYOUT"), 1857 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1858 name = "LAYOUT_REQUIRED"), 1859 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1860 name = "DRAWING_CACHE_INVALID", outputIf = false), 1861 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1862 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1863 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1864 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1865 }) 1866 int mPrivateFlags; 1867 1868 /** 1869 * This view's request for the visibility of the status bar. 1870 * @hide 1871 */ 1872 @ViewDebug.ExportedProperty() 1873 int mSystemUiVisibility; 1874 1875 /** 1876 * Count of how many windows this view has been attached to. 1877 */ 1878 int mWindowAttachCount; 1879 1880 /** 1881 * The layout parameters associated with this view and used by the parent 1882 * {@link android.view.ViewGroup} to determine how this view should be 1883 * laid out. 1884 * {@hide} 1885 */ 1886 protected ViewGroup.LayoutParams mLayoutParams; 1887 1888 /** 1889 * The view flags hold various views states. 1890 * {@hide} 1891 */ 1892 @ViewDebug.ExportedProperty 1893 int mViewFlags; 1894 1895 /** 1896 * The transform matrix for the View. This transform is calculated internally 1897 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1898 * is used by default. Do *not* use this variable directly; instead call 1899 * getMatrix(), which will automatically recalculate the matrix if necessary 1900 * to get the correct matrix based on the latest rotation and scale properties. 1901 */ 1902 private final Matrix mMatrix = new Matrix(); 1903 1904 /** 1905 * The transform matrix for the View. This transform is calculated internally 1906 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1907 * is used by default. Do *not* use this variable directly; instead call 1908 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 1909 * to get the correct matrix based on the latest rotation and scale properties. 1910 */ 1911 private Matrix mInverseMatrix; 1912 1913 /** 1914 * An internal variable that tracks whether we need to recalculate the 1915 * transform matrix, based on whether the rotation or scaleX/Y properties 1916 * have changed since the matrix was last calculated. 1917 */ 1918 private boolean mMatrixDirty = false; 1919 1920 /** 1921 * An internal variable that tracks whether we need to recalculate the 1922 * transform matrix, based on whether the rotation or scaleX/Y properties 1923 * have changed since the matrix was last calculated. 1924 */ 1925 private boolean mInverseMatrixDirty = true; 1926 1927 /** 1928 * A variable that tracks whether we need to recalculate the 1929 * transform matrix, based on whether the rotation or scaleX/Y properties 1930 * have changed since the matrix was last calculated. This variable 1931 * is only valid after a call to updateMatrix() or to a function that 1932 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 1933 */ 1934 private boolean mMatrixIsIdentity = true; 1935 1936 /** 1937 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 1938 */ 1939 private Camera mCamera = null; 1940 1941 /** 1942 * This matrix is used when computing the matrix for 3D rotations. 1943 */ 1944 private Matrix matrix3D = null; 1945 1946 /** 1947 * These prev values are used to recalculate a centered pivot point when necessary. The 1948 * pivot point is only used in matrix operations (when rotation, scale, or translation are 1949 * set), so thes values are only used then as well. 1950 */ 1951 private int mPrevWidth = -1; 1952 private int mPrevHeight = -1; 1953 1954 private boolean mLastIsOpaque; 1955 1956 /** 1957 * Convenience value to check for float values that are close enough to zero to be considered 1958 * zero. 1959 */ 1960 private static final float NONZERO_EPSILON = .001f; 1961 1962 /** 1963 * The degrees rotation around the vertical axis through the pivot point. 1964 */ 1965 @ViewDebug.ExportedProperty 1966 private float mRotationY = 0f; 1967 1968 /** 1969 * The degrees rotation around the horizontal axis through the pivot point. 1970 */ 1971 @ViewDebug.ExportedProperty 1972 private float mRotationX = 0f; 1973 1974 /** 1975 * The degrees rotation around the pivot point. 1976 */ 1977 @ViewDebug.ExportedProperty 1978 private float mRotation = 0f; 1979 1980 /** 1981 * The amount of translation of the object away from its left property (post-layout). 1982 */ 1983 @ViewDebug.ExportedProperty 1984 private float mTranslationX = 0f; 1985 1986 /** 1987 * The amount of translation of the object away from its top property (post-layout). 1988 */ 1989 @ViewDebug.ExportedProperty 1990 private float mTranslationY = 0f; 1991 1992 /** 1993 * The amount of scale in the x direction around the pivot point. A 1994 * value of 1 means no scaling is applied. 1995 */ 1996 @ViewDebug.ExportedProperty 1997 private float mScaleX = 1f; 1998 1999 /** 2000 * The amount of scale in the y direction around the pivot point. A 2001 * value of 1 means no scaling is applied. 2002 */ 2003 @ViewDebug.ExportedProperty 2004 private float mScaleY = 1f; 2005 2006 /** 2007 * The amount of scale in the x direction around the pivot point. A 2008 * value of 1 means no scaling is applied. 2009 */ 2010 @ViewDebug.ExportedProperty 2011 private float mPivotX = 0f; 2012 2013 /** 2014 * The amount of scale in the y direction around the pivot point. A 2015 * value of 1 means no scaling is applied. 2016 */ 2017 @ViewDebug.ExportedProperty 2018 private float mPivotY = 0f; 2019 2020 /** 2021 * The opacity of the View. This is a value from 0 to 1, where 0 means 2022 * completely transparent and 1 means completely opaque. 2023 */ 2024 @ViewDebug.ExportedProperty 2025 private float mAlpha = 1f; 2026 2027 /** 2028 * The distance in pixels from the left edge of this view's parent 2029 * to the left edge of this view. 2030 * {@hide} 2031 */ 2032 @ViewDebug.ExportedProperty(category = "layout") 2033 protected int mLeft; 2034 /** 2035 * The distance in pixels from the left edge of this view's parent 2036 * to the right edge of this view. 2037 * {@hide} 2038 */ 2039 @ViewDebug.ExportedProperty(category = "layout") 2040 protected int mRight; 2041 /** 2042 * The distance in pixels from the top edge of this view's parent 2043 * to the top edge of this view. 2044 * {@hide} 2045 */ 2046 @ViewDebug.ExportedProperty(category = "layout") 2047 protected int mTop; 2048 /** 2049 * The distance in pixels from the top edge of this view's parent 2050 * to the bottom edge of this view. 2051 * {@hide} 2052 */ 2053 @ViewDebug.ExportedProperty(category = "layout") 2054 protected int mBottom; 2055 2056 /** 2057 * The offset, in pixels, by which the content of this view is scrolled 2058 * horizontally. 2059 * {@hide} 2060 */ 2061 @ViewDebug.ExportedProperty(category = "scrolling") 2062 protected int mScrollX; 2063 /** 2064 * The offset, in pixels, by which the content of this view is scrolled 2065 * vertically. 2066 * {@hide} 2067 */ 2068 @ViewDebug.ExportedProperty(category = "scrolling") 2069 protected int mScrollY; 2070 2071 /** 2072 * The left padding in pixels, that is the distance in pixels between the 2073 * left edge of this view and the left edge of its content. 2074 * {@hide} 2075 */ 2076 @ViewDebug.ExportedProperty(category = "padding") 2077 protected int mPaddingLeft; 2078 /** 2079 * The right padding in pixels, that is the distance in pixels between the 2080 * right edge of this view and the right edge of its content. 2081 * {@hide} 2082 */ 2083 @ViewDebug.ExportedProperty(category = "padding") 2084 protected int mPaddingRight; 2085 /** 2086 * The top padding in pixels, that is the distance in pixels between the 2087 * top edge of this view and the top edge of its content. 2088 * {@hide} 2089 */ 2090 @ViewDebug.ExportedProperty(category = "padding") 2091 protected int mPaddingTop; 2092 /** 2093 * The bottom padding in pixels, that is the distance in pixels between the 2094 * bottom edge of this view and the bottom edge of its content. 2095 * {@hide} 2096 */ 2097 @ViewDebug.ExportedProperty(category = "padding") 2098 protected int mPaddingBottom; 2099 2100 /** 2101 * Briefly describes the view and is primarily used for accessibility support. 2102 */ 2103 private CharSequence mContentDescription; 2104 2105 /** 2106 * Cache the paddingRight set by the user to append to the scrollbar's size. 2107 */ 2108 @ViewDebug.ExportedProperty(category = "padding") 2109 int mUserPaddingRight; 2110 2111 /** 2112 * Cache the paddingBottom set by the user to append to the scrollbar's size. 2113 */ 2114 @ViewDebug.ExportedProperty(category = "padding") 2115 int mUserPaddingBottom; 2116 2117 /** 2118 * Cache the paddingLeft set by the user to append to the scrollbar's size. 2119 */ 2120 @ViewDebug.ExportedProperty(category = "padding") 2121 int mUserPaddingLeft; 2122 2123 /** 2124 * @hide 2125 */ 2126 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 2127 /** 2128 * @hide 2129 */ 2130 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 2131 2132 private Resources mResources = null; 2133 2134 private Drawable mBGDrawable; 2135 2136 private int mBackgroundResource; 2137 private boolean mBackgroundSizeChanged; 2138 2139 /** 2140 * Listener used to dispatch focus change events. 2141 * This field should be made private, so it is hidden from the SDK. 2142 * {@hide} 2143 */ 2144 protected OnFocusChangeListener mOnFocusChangeListener; 2145 2146 /** 2147 * Listeners for layout change events. 2148 */ 2149 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2150 2151 /** 2152 * Listener used to dispatch click events. 2153 * This field should be made private, so it is hidden from the SDK. 2154 * {@hide} 2155 */ 2156 protected OnClickListener mOnClickListener; 2157 2158 /** 2159 * Listener used to dispatch long click events. 2160 * This field should be made private, so it is hidden from the SDK. 2161 * {@hide} 2162 */ 2163 protected OnLongClickListener mOnLongClickListener; 2164 2165 /** 2166 * Listener used to build the context menu. 2167 * This field should be made private, so it is hidden from the SDK. 2168 * {@hide} 2169 */ 2170 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2171 2172 private OnKeyListener mOnKeyListener; 2173 2174 private OnTouchListener mOnTouchListener; 2175 2176 private OnDragListener mOnDragListener; 2177 2178 private OnSystemUiVisibilityChangeListener mOnSystemUiVisibilityChangeListener; 2179 2180 /** 2181 * The application environment this view lives in. 2182 * This field should be made private, so it is hidden from the SDK. 2183 * {@hide} 2184 */ 2185 protected Context mContext; 2186 2187 private ScrollabilityCache mScrollCache; 2188 2189 private int[] mDrawableState = null; 2190 2191 private Bitmap mDrawingCache; 2192 private Bitmap mUnscaledDrawingCache; 2193 private DisplayList mDisplayList; 2194 private HardwareLayer mHardwareLayer; 2195 2196 /** 2197 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2198 * the user may specify which view to go to next. 2199 */ 2200 private int mNextFocusLeftId = View.NO_ID; 2201 2202 /** 2203 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2204 * the user may specify which view to go to next. 2205 */ 2206 private int mNextFocusRightId = View.NO_ID; 2207 2208 /** 2209 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2210 * the user may specify which view to go to next. 2211 */ 2212 private int mNextFocusUpId = View.NO_ID; 2213 2214 /** 2215 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2216 * the user may specify which view to go to next. 2217 */ 2218 private int mNextFocusDownId = View.NO_ID; 2219 2220 /** 2221 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2222 * the user may specify which view to go to next. 2223 */ 2224 int mNextFocusForwardId = View.NO_ID; 2225 2226 private CheckForLongPress mPendingCheckForLongPress; 2227 private CheckForTap mPendingCheckForTap = null; 2228 private PerformClick mPerformClick; 2229 2230 private UnsetPressedState mUnsetPressedState; 2231 2232 /** 2233 * Whether the long press's action has been invoked. The tap's action is invoked on the 2234 * up event while a long press is invoked as soon as the long press duration is reached, so 2235 * a long press could be performed before the tap is checked, in which case the tap's action 2236 * should not be invoked. 2237 */ 2238 private boolean mHasPerformedLongPress; 2239 2240 /** 2241 * The minimum height of the view. We'll try our best to have the height 2242 * of this view to at least this amount. 2243 */ 2244 @ViewDebug.ExportedProperty(category = "measurement") 2245 private int mMinHeight; 2246 2247 /** 2248 * The minimum width of the view. We'll try our best to have the width 2249 * of this view to at least this amount. 2250 */ 2251 @ViewDebug.ExportedProperty(category = "measurement") 2252 private int mMinWidth; 2253 2254 /** 2255 * The delegate to handle touch events that are physically in this view 2256 * but should be handled by another view. 2257 */ 2258 private TouchDelegate mTouchDelegate = null; 2259 2260 /** 2261 * Solid color to use as a background when creating the drawing cache. Enables 2262 * the cache to use 16 bit bitmaps instead of 32 bit. 2263 */ 2264 private int mDrawingCacheBackgroundColor = 0; 2265 2266 /** 2267 * Special tree observer used when mAttachInfo is null. 2268 */ 2269 private ViewTreeObserver mFloatingTreeObserver; 2270 2271 /** 2272 * Cache the touch slop from the context that created the view. 2273 */ 2274 private int mTouchSlop; 2275 2276 /** 2277 * Cache drag/drop state 2278 * 2279 */ 2280 boolean mCanAcceptDrop; 2281 2282 /** 2283 * Flag indicating that a drag can cross window boundaries 2284 * @hide 2285 */ 2286 public static final int DRAG_FLAG_GLOBAL = 1; 2287 2288 /** 2289 * Position of the vertical scroll bar. 2290 */ 2291 private int mVerticalScrollbarPosition; 2292 2293 /** 2294 * Position the scroll bar at the default position as determined by the system. 2295 */ 2296 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2297 2298 /** 2299 * Position the scroll bar along the left edge. 2300 */ 2301 public static final int SCROLLBAR_POSITION_LEFT = 1; 2302 2303 /** 2304 * Position the scroll bar along the right edge. 2305 */ 2306 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2307 2308 /** 2309 * Indicates that the view does not have a layer. 2310 * 2311 * @see #getLayerType() 2312 * @see #setLayerType(int, android.graphics.Paint) 2313 * @see #LAYER_TYPE_SOFTWARE 2314 * @see #LAYER_TYPE_HARDWARE 2315 */ 2316 public static final int LAYER_TYPE_NONE = 0; 2317 2318 /** 2319 * <p>Indicates that the view has a software layer. A software layer is backed 2320 * by a bitmap and causes the view to be rendered using Android's software 2321 * rendering pipeline, even if hardware acceleration is enabled.</p> 2322 * 2323 * <p>Software layers have various usages:</p> 2324 * <p>When the application is not using hardware acceleration, a software layer 2325 * is useful to apply a specific color filter and/or blending mode and/or 2326 * translucency to a view and all its children.</p> 2327 * <p>When the application is using hardware acceleration, a software layer 2328 * is useful to render drawing primitives not supported by the hardware 2329 * accelerated pipeline. It can also be used to cache a complex view tree 2330 * into a texture and reduce the complexity of drawing operations. For instance, 2331 * when animating a complex view tree with a translation, a software layer can 2332 * be used to render the view tree only once.</p> 2333 * <p>Software layers should be avoided when the affected view tree updates 2334 * often. Every update will require to re-render the software layer, which can 2335 * potentially be slow (particularly when hardware acceleration is turned on 2336 * since the layer will have to be uploaded into a hardware texture after every 2337 * update.)</p> 2338 * 2339 * @see #getLayerType() 2340 * @see #setLayerType(int, android.graphics.Paint) 2341 * @see #LAYER_TYPE_NONE 2342 * @see #LAYER_TYPE_HARDWARE 2343 */ 2344 public static final int LAYER_TYPE_SOFTWARE = 1; 2345 2346 /** 2347 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2348 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2349 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2350 * rendering pipeline, but only if hardware acceleration is turned on for the 2351 * view hierarchy. When hardware acceleration is turned off, hardware layers 2352 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2353 * 2354 * <p>A hardware layer is useful to apply a specific color filter and/or 2355 * blending mode and/or translucency to a view and all its children.</p> 2356 * <p>A hardware layer can be used to cache a complex view tree into a 2357 * texture and reduce the complexity of drawing operations. For instance, 2358 * when animating a complex view tree with a translation, a hardware layer can 2359 * be used to render the view tree only once.</p> 2360 * <p>A hardware layer can also be used to increase the rendering quality when 2361 * rotation transformations are applied on a view. It can also be used to 2362 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2363 * 2364 * @see #getLayerType() 2365 * @see #setLayerType(int, android.graphics.Paint) 2366 * @see #LAYER_TYPE_NONE 2367 * @see #LAYER_TYPE_SOFTWARE 2368 */ 2369 public static final int LAYER_TYPE_HARDWARE = 2; 2370 2371 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2372 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2373 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2374 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2375 }) 2376 int mLayerType = LAYER_TYPE_NONE; 2377 Paint mLayerPaint; 2378 2379 /** 2380 * Simple constructor to use when creating a view from code. 2381 * 2382 * @param context The Context the view is running in, through which it can 2383 * access the current theme, resources, etc. 2384 */ 2385 public View(Context context) { 2386 mContext = context; 2387 mResources = context != null ? context.getResources() : null; 2388 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 2389 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2390 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2391 } 2392 2393 /** 2394 * Constructor that is called when inflating a view from XML. This is called 2395 * when a view is being constructed from an XML file, supplying attributes 2396 * that were specified in the XML file. This version uses a default style of 2397 * 0, so the only attribute values applied are those in the Context's Theme 2398 * and the given AttributeSet. 2399 * 2400 * <p> 2401 * The method onFinishInflate() will be called after all children have been 2402 * added. 2403 * 2404 * @param context The Context the view is running in, through which it can 2405 * access the current theme, resources, etc. 2406 * @param attrs The attributes of the XML tag that is inflating the view. 2407 * @see #View(Context, AttributeSet, int) 2408 */ 2409 public View(Context context, AttributeSet attrs) { 2410 this(context, attrs, 0); 2411 } 2412 2413 /** 2414 * Perform inflation from XML and apply a class-specific base style. This 2415 * constructor of View allows subclasses to use their own base style when 2416 * they are inflating. For example, a Button class's constructor would call 2417 * this version of the super class constructor and supply 2418 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2419 * the theme's button style to modify all of the base view attributes (in 2420 * particular its background) as well as the Button class's attributes. 2421 * 2422 * @param context The Context the view is running in, through which it can 2423 * access the current theme, resources, etc. 2424 * @param attrs The attributes of the XML tag that is inflating the view. 2425 * @param defStyle The default style to apply to this view. If 0, no style 2426 * will be applied (beyond what is included in the theme). This may 2427 * either be an attribute resource, whose value will be retrieved 2428 * from the current theme, or an explicit style resource. 2429 * @see #View(Context, AttributeSet) 2430 */ 2431 public View(Context context, AttributeSet attrs, int defStyle) { 2432 this(context); 2433 2434 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2435 defStyle, 0); 2436 2437 Drawable background = null; 2438 2439 int leftPadding = -1; 2440 int topPadding = -1; 2441 int rightPadding = -1; 2442 int bottomPadding = -1; 2443 2444 int padding = -1; 2445 2446 int viewFlagValues = 0; 2447 int viewFlagMasks = 0; 2448 2449 boolean setScrollContainer = false; 2450 2451 int x = 0; 2452 int y = 0; 2453 2454 float tx = 0; 2455 float ty = 0; 2456 float rotation = 0; 2457 float rotationX = 0; 2458 float rotationY = 0; 2459 float sx = 1f; 2460 float sy = 1f; 2461 boolean transformSet = false; 2462 2463 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2464 2465 int overScrollMode = mOverScrollMode; 2466 final int N = a.getIndexCount(); 2467 for (int i = 0; i < N; i++) { 2468 int attr = a.getIndex(i); 2469 switch (attr) { 2470 case com.android.internal.R.styleable.View_background: 2471 background = a.getDrawable(attr); 2472 break; 2473 case com.android.internal.R.styleable.View_padding: 2474 padding = a.getDimensionPixelSize(attr, -1); 2475 break; 2476 case com.android.internal.R.styleable.View_paddingLeft: 2477 leftPadding = a.getDimensionPixelSize(attr, -1); 2478 break; 2479 case com.android.internal.R.styleable.View_paddingTop: 2480 topPadding = a.getDimensionPixelSize(attr, -1); 2481 break; 2482 case com.android.internal.R.styleable.View_paddingRight: 2483 rightPadding = a.getDimensionPixelSize(attr, -1); 2484 break; 2485 case com.android.internal.R.styleable.View_paddingBottom: 2486 bottomPadding = a.getDimensionPixelSize(attr, -1); 2487 break; 2488 case com.android.internal.R.styleable.View_scrollX: 2489 x = a.getDimensionPixelOffset(attr, 0); 2490 break; 2491 case com.android.internal.R.styleable.View_scrollY: 2492 y = a.getDimensionPixelOffset(attr, 0); 2493 break; 2494 case com.android.internal.R.styleable.View_alpha: 2495 setAlpha(a.getFloat(attr, 1f)); 2496 break; 2497 case com.android.internal.R.styleable.View_transformPivotX: 2498 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2499 break; 2500 case com.android.internal.R.styleable.View_transformPivotY: 2501 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2502 break; 2503 case com.android.internal.R.styleable.View_translationX: 2504 tx = a.getDimensionPixelOffset(attr, 0); 2505 transformSet = true; 2506 break; 2507 case com.android.internal.R.styleable.View_translationY: 2508 ty = a.getDimensionPixelOffset(attr, 0); 2509 transformSet = true; 2510 break; 2511 case com.android.internal.R.styleable.View_rotation: 2512 rotation = a.getFloat(attr, 0); 2513 transformSet = true; 2514 break; 2515 case com.android.internal.R.styleable.View_rotationX: 2516 rotationX = a.getFloat(attr, 0); 2517 transformSet = true; 2518 break; 2519 case com.android.internal.R.styleable.View_rotationY: 2520 rotationY = a.getFloat(attr, 0); 2521 transformSet = true; 2522 break; 2523 case com.android.internal.R.styleable.View_scaleX: 2524 sx = a.getFloat(attr, 1f); 2525 transformSet = true; 2526 break; 2527 case com.android.internal.R.styleable.View_scaleY: 2528 sy = a.getFloat(attr, 1f); 2529 transformSet = true; 2530 break; 2531 case com.android.internal.R.styleable.View_id: 2532 mID = a.getResourceId(attr, NO_ID); 2533 break; 2534 case com.android.internal.R.styleable.View_tag: 2535 mTag = a.getText(attr); 2536 break; 2537 case com.android.internal.R.styleable.View_fitsSystemWindows: 2538 if (a.getBoolean(attr, false)) { 2539 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2540 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2541 } 2542 break; 2543 case com.android.internal.R.styleable.View_focusable: 2544 if (a.getBoolean(attr, false)) { 2545 viewFlagValues |= FOCUSABLE; 2546 viewFlagMasks |= FOCUSABLE_MASK; 2547 } 2548 break; 2549 case com.android.internal.R.styleable.View_focusableInTouchMode: 2550 if (a.getBoolean(attr, false)) { 2551 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2552 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2553 } 2554 break; 2555 case com.android.internal.R.styleable.View_clickable: 2556 if (a.getBoolean(attr, false)) { 2557 viewFlagValues |= CLICKABLE; 2558 viewFlagMasks |= CLICKABLE; 2559 } 2560 break; 2561 case com.android.internal.R.styleable.View_longClickable: 2562 if (a.getBoolean(attr, false)) { 2563 viewFlagValues |= LONG_CLICKABLE; 2564 viewFlagMasks |= LONG_CLICKABLE; 2565 } 2566 break; 2567 case com.android.internal.R.styleable.View_saveEnabled: 2568 if (!a.getBoolean(attr, true)) { 2569 viewFlagValues |= SAVE_DISABLED; 2570 viewFlagMasks |= SAVE_DISABLED_MASK; 2571 } 2572 break; 2573 case com.android.internal.R.styleable.View_duplicateParentState: 2574 if (a.getBoolean(attr, false)) { 2575 viewFlagValues |= DUPLICATE_PARENT_STATE; 2576 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2577 } 2578 break; 2579 case com.android.internal.R.styleable.View_visibility: 2580 final int visibility = a.getInt(attr, 0); 2581 if (visibility != 0) { 2582 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2583 viewFlagMasks |= VISIBILITY_MASK; 2584 } 2585 break; 2586 case com.android.internal.R.styleable.View_drawingCacheQuality: 2587 final int cacheQuality = a.getInt(attr, 0); 2588 if (cacheQuality != 0) { 2589 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2590 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2591 } 2592 break; 2593 case com.android.internal.R.styleable.View_contentDescription: 2594 mContentDescription = a.getString(attr); 2595 break; 2596 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2597 if (!a.getBoolean(attr, true)) { 2598 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2599 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2600 } 2601 break; 2602 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2603 if (!a.getBoolean(attr, true)) { 2604 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2605 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2606 } 2607 break; 2608 case R.styleable.View_scrollbars: 2609 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2610 if (scrollbars != SCROLLBARS_NONE) { 2611 viewFlagValues |= scrollbars; 2612 viewFlagMasks |= SCROLLBARS_MASK; 2613 initializeScrollbars(a); 2614 } 2615 break; 2616 case R.styleable.View_fadingEdge: 2617 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2618 if (fadingEdge != FADING_EDGE_NONE) { 2619 viewFlagValues |= fadingEdge; 2620 viewFlagMasks |= FADING_EDGE_MASK; 2621 initializeFadingEdge(a); 2622 } 2623 break; 2624 case R.styleable.View_scrollbarStyle: 2625 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2626 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2627 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2628 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2629 } 2630 break; 2631 case R.styleable.View_isScrollContainer: 2632 setScrollContainer = true; 2633 if (a.getBoolean(attr, false)) { 2634 setScrollContainer(true); 2635 } 2636 break; 2637 case com.android.internal.R.styleable.View_keepScreenOn: 2638 if (a.getBoolean(attr, false)) { 2639 viewFlagValues |= KEEP_SCREEN_ON; 2640 viewFlagMasks |= KEEP_SCREEN_ON; 2641 } 2642 break; 2643 case R.styleable.View_filterTouchesWhenObscured: 2644 if (a.getBoolean(attr, false)) { 2645 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2646 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2647 } 2648 break; 2649 case R.styleable.View_nextFocusLeft: 2650 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2651 break; 2652 case R.styleable.View_nextFocusRight: 2653 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2654 break; 2655 case R.styleable.View_nextFocusUp: 2656 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2657 break; 2658 case R.styleable.View_nextFocusDown: 2659 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2660 break; 2661 case R.styleable.View_nextFocusForward: 2662 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2663 break; 2664 case R.styleable.View_minWidth: 2665 mMinWidth = a.getDimensionPixelSize(attr, 0); 2666 break; 2667 case R.styleable.View_minHeight: 2668 mMinHeight = a.getDimensionPixelSize(attr, 0); 2669 break; 2670 case R.styleable.View_onClick: 2671 if (context.isRestricted()) { 2672 throw new IllegalStateException("The android:onClick attribute cannot " 2673 + "be used within a restricted context"); 2674 } 2675 2676 final String handlerName = a.getString(attr); 2677 if (handlerName != null) { 2678 setOnClickListener(new OnClickListener() { 2679 private Method mHandler; 2680 2681 public void onClick(View v) { 2682 if (mHandler == null) { 2683 try { 2684 mHandler = getContext().getClass().getMethod(handlerName, 2685 View.class); 2686 } catch (NoSuchMethodException e) { 2687 int id = getId(); 2688 String idText = id == NO_ID ? "" : " with id '" 2689 + getContext().getResources().getResourceEntryName( 2690 id) + "'"; 2691 throw new IllegalStateException("Could not find a method " + 2692 handlerName + "(View) in the activity " 2693 + getContext().getClass() + " for onClick handler" 2694 + " on view " + View.this.getClass() + idText, e); 2695 } 2696 } 2697 2698 try { 2699 mHandler.invoke(getContext(), View.this); 2700 } catch (IllegalAccessException e) { 2701 throw new IllegalStateException("Could not execute non " 2702 + "public method of the activity", e); 2703 } catch (InvocationTargetException e) { 2704 throw new IllegalStateException("Could not execute " 2705 + "method of the activity", e); 2706 } 2707 } 2708 }); 2709 } 2710 break; 2711 case R.styleable.View_overScrollMode: 2712 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2713 break; 2714 case R.styleable.View_verticalScrollbarPosition: 2715 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2716 break; 2717 case R.styleable.View_layerType: 2718 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2719 break; 2720 } 2721 } 2722 2723 setOverScrollMode(overScrollMode); 2724 2725 if (background != null) { 2726 setBackgroundDrawable(background); 2727 } 2728 2729 if (padding >= 0) { 2730 leftPadding = padding; 2731 topPadding = padding; 2732 rightPadding = padding; 2733 bottomPadding = padding; 2734 } 2735 2736 // If the user specified the padding (either with android:padding or 2737 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2738 // use the default padding or the padding from the background drawable 2739 // (stored at this point in mPadding*) 2740 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2741 topPadding >= 0 ? topPadding : mPaddingTop, 2742 rightPadding >= 0 ? rightPadding : mPaddingRight, 2743 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2744 2745 if (viewFlagMasks != 0) { 2746 setFlags(viewFlagValues, viewFlagMasks); 2747 } 2748 2749 // Needs to be called after mViewFlags is set 2750 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2751 recomputePadding(); 2752 } 2753 2754 if (x != 0 || y != 0) { 2755 scrollTo(x, y); 2756 } 2757 2758 if (transformSet) { 2759 setTranslationX(tx); 2760 setTranslationY(ty); 2761 setRotation(rotation); 2762 setRotationX(rotationX); 2763 setRotationY(rotationY); 2764 setScaleX(sx); 2765 setScaleY(sy); 2766 } 2767 2768 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2769 setScrollContainer(true); 2770 } 2771 2772 computeOpaqueFlags(); 2773 2774 a.recycle(); 2775 } 2776 2777 /** 2778 * Non-public constructor for use in testing 2779 */ 2780 View() { 2781 } 2782 2783 /** 2784 * <p> 2785 * Initializes the fading edges from a given set of styled attributes. This 2786 * method should be called by subclasses that need fading edges and when an 2787 * instance of these subclasses is created programmatically rather than 2788 * being inflated from XML. This method is automatically called when the XML 2789 * is inflated. 2790 * </p> 2791 * 2792 * @param a the styled attributes set to initialize the fading edges from 2793 */ 2794 protected void initializeFadingEdge(TypedArray a) { 2795 initScrollCache(); 2796 2797 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2798 R.styleable.View_fadingEdgeLength, 2799 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2800 } 2801 2802 /** 2803 * Returns the size of the vertical faded edges used to indicate that more 2804 * content in this view is visible. 2805 * 2806 * @return The size in pixels of the vertical faded edge or 0 if vertical 2807 * faded edges are not enabled for this view. 2808 * @attr ref android.R.styleable#View_fadingEdgeLength 2809 */ 2810 public int getVerticalFadingEdgeLength() { 2811 if (isVerticalFadingEdgeEnabled()) { 2812 ScrollabilityCache cache = mScrollCache; 2813 if (cache != null) { 2814 return cache.fadingEdgeLength; 2815 } 2816 } 2817 return 0; 2818 } 2819 2820 /** 2821 * Set the size of the faded edge used to indicate that more content in this 2822 * view is available. Will not change whether the fading edge is enabled; use 2823 * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled} 2824 * to enable the fading edge for the vertical or horizontal fading edges. 2825 * 2826 * @param length The size in pixels of the faded edge used to indicate that more 2827 * content in this view is visible. 2828 */ 2829 public void setFadingEdgeLength(int length) { 2830 initScrollCache(); 2831 mScrollCache.fadingEdgeLength = length; 2832 } 2833 2834 /** 2835 * Returns the size of the horizontal faded edges used to indicate that more 2836 * content in this view is visible. 2837 * 2838 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2839 * faded edges are not enabled for this view. 2840 * @attr ref android.R.styleable#View_fadingEdgeLength 2841 */ 2842 public int getHorizontalFadingEdgeLength() { 2843 if (isHorizontalFadingEdgeEnabled()) { 2844 ScrollabilityCache cache = mScrollCache; 2845 if (cache != null) { 2846 return cache.fadingEdgeLength; 2847 } 2848 } 2849 return 0; 2850 } 2851 2852 /** 2853 * Returns the width of the vertical scrollbar. 2854 * 2855 * @return The width in pixels of the vertical scrollbar or 0 if there 2856 * is no vertical scrollbar. 2857 */ 2858 public int getVerticalScrollbarWidth() { 2859 ScrollabilityCache cache = mScrollCache; 2860 if (cache != null) { 2861 ScrollBarDrawable scrollBar = cache.scrollBar; 2862 if (scrollBar != null) { 2863 int size = scrollBar.getSize(true); 2864 if (size <= 0) { 2865 size = cache.scrollBarSize; 2866 } 2867 return size; 2868 } 2869 return 0; 2870 } 2871 return 0; 2872 } 2873 2874 /** 2875 * Returns the height of the horizontal scrollbar. 2876 * 2877 * @return The height in pixels of the horizontal scrollbar or 0 if 2878 * there is no horizontal scrollbar. 2879 */ 2880 protected int getHorizontalScrollbarHeight() { 2881 ScrollabilityCache cache = mScrollCache; 2882 if (cache != null) { 2883 ScrollBarDrawable scrollBar = cache.scrollBar; 2884 if (scrollBar != null) { 2885 int size = scrollBar.getSize(false); 2886 if (size <= 0) { 2887 size = cache.scrollBarSize; 2888 } 2889 return size; 2890 } 2891 return 0; 2892 } 2893 return 0; 2894 } 2895 2896 /** 2897 * <p> 2898 * Initializes the scrollbars from a given set of styled attributes. This 2899 * method should be called by subclasses that need scrollbars and when an 2900 * instance of these subclasses is created programmatically rather than 2901 * being inflated from XML. This method is automatically called when the XML 2902 * is inflated. 2903 * </p> 2904 * 2905 * @param a the styled attributes set to initialize the scrollbars from 2906 */ 2907 protected void initializeScrollbars(TypedArray a) { 2908 initScrollCache(); 2909 2910 final ScrollabilityCache scrollabilityCache = mScrollCache; 2911 2912 if (scrollabilityCache.scrollBar == null) { 2913 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 2914 } 2915 2916 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 2917 2918 if (!fadeScrollbars) { 2919 scrollabilityCache.state = ScrollabilityCache.ON; 2920 } 2921 scrollabilityCache.fadeScrollBars = fadeScrollbars; 2922 2923 2924 scrollabilityCache.scrollBarFadeDuration = a.getInt( 2925 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 2926 .getScrollBarFadeDuration()); 2927 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 2928 R.styleable.View_scrollbarDefaultDelayBeforeFade, 2929 ViewConfiguration.getScrollDefaultDelay()); 2930 2931 2932 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 2933 com.android.internal.R.styleable.View_scrollbarSize, 2934 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 2935 2936 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 2937 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 2938 2939 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 2940 if (thumb != null) { 2941 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 2942 } 2943 2944 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 2945 false); 2946 if (alwaysDraw) { 2947 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 2948 } 2949 2950 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 2951 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 2952 2953 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 2954 if (thumb != null) { 2955 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 2956 } 2957 2958 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 2959 false); 2960 if (alwaysDraw) { 2961 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 2962 } 2963 2964 // Re-apply user/background padding so that scrollbar(s) get added 2965 recomputePadding(); 2966 } 2967 2968 /** 2969 * <p> 2970 * Initalizes the scrollability cache if necessary. 2971 * </p> 2972 */ 2973 private void initScrollCache() { 2974 if (mScrollCache == null) { 2975 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 2976 } 2977 } 2978 2979 /** 2980 * Set the position of the vertical scroll bar. Should be one of 2981 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 2982 * {@link #SCROLLBAR_POSITION_RIGHT}. 2983 * 2984 * @param position Where the vertical scroll bar should be positioned. 2985 */ 2986 public void setVerticalScrollbarPosition(int position) { 2987 if (mVerticalScrollbarPosition != position) { 2988 mVerticalScrollbarPosition = position; 2989 computeOpaqueFlags(); 2990 recomputePadding(); 2991 } 2992 } 2993 2994 /** 2995 * @return The position where the vertical scroll bar will show, if applicable. 2996 * @see #setVerticalScrollbarPosition(int) 2997 */ 2998 public int getVerticalScrollbarPosition() { 2999 return mVerticalScrollbarPosition; 3000 } 3001 3002 /** 3003 * Register a callback to be invoked when focus of this view changed. 3004 * 3005 * @param l The callback that will run. 3006 */ 3007 public void setOnFocusChangeListener(OnFocusChangeListener l) { 3008 mOnFocusChangeListener = l; 3009 } 3010 3011 /** 3012 * Add a listener that will be called when the bounds of the view change due to 3013 * layout processing. 3014 * 3015 * @param listener The listener that will be called when layout bounds change. 3016 */ 3017 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 3018 if (mOnLayoutChangeListeners == null) { 3019 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 3020 } 3021 mOnLayoutChangeListeners.add(listener); 3022 } 3023 3024 /** 3025 * Remove a listener for layout changes. 3026 * 3027 * @param listener The listener for layout bounds change. 3028 */ 3029 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 3030 if (mOnLayoutChangeListeners == null) { 3031 return; 3032 } 3033 mOnLayoutChangeListeners.remove(listener); 3034 } 3035 3036 /** 3037 * Returns the focus-change callback registered for this view. 3038 * 3039 * @return The callback, or null if one is not registered. 3040 */ 3041 public OnFocusChangeListener getOnFocusChangeListener() { 3042 return mOnFocusChangeListener; 3043 } 3044 3045 /** 3046 * Register a callback to be invoked when this view is clicked. If this view is not 3047 * clickable, it becomes clickable. 3048 * 3049 * @param l The callback that will run 3050 * 3051 * @see #setClickable(boolean) 3052 */ 3053 public void setOnClickListener(OnClickListener l) { 3054 if (!isClickable()) { 3055 setClickable(true); 3056 } 3057 mOnClickListener = l; 3058 } 3059 3060 /** 3061 * Register a callback to be invoked when this view is clicked and held. If this view is not 3062 * long clickable, it becomes long clickable. 3063 * 3064 * @param l The callback that will run 3065 * 3066 * @see #setLongClickable(boolean) 3067 */ 3068 public void setOnLongClickListener(OnLongClickListener l) { 3069 if (!isLongClickable()) { 3070 setLongClickable(true); 3071 } 3072 mOnLongClickListener = l; 3073 } 3074 3075 /** 3076 * Register a callback to be invoked when the context menu for this view is 3077 * being built. If this view is not long clickable, it becomes long clickable. 3078 * 3079 * @param l The callback that will run 3080 * 3081 */ 3082 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 3083 if (!isLongClickable()) { 3084 setLongClickable(true); 3085 } 3086 mOnCreateContextMenuListener = l; 3087 } 3088 3089 /** 3090 * Call this view's OnClickListener, if it is defined. 3091 * 3092 * @return True there was an assigned OnClickListener that was called, false 3093 * otherwise is returned. 3094 */ 3095 public boolean performClick() { 3096 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 3097 3098 if (mOnClickListener != null) { 3099 playSoundEffect(SoundEffectConstants.CLICK); 3100 mOnClickListener.onClick(this); 3101 return true; 3102 } 3103 3104 return false; 3105 } 3106 3107 /** 3108 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 3109 * OnLongClickListener did not consume the event. 3110 * 3111 * @return True if one of the above receivers consumed the event, false otherwise. 3112 */ 3113 public boolean performLongClick() { 3114 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 3115 3116 boolean handled = false; 3117 if (mOnLongClickListener != null) { 3118 handled = mOnLongClickListener.onLongClick(View.this); 3119 } 3120 if (!handled) { 3121 handled = showContextMenu(); 3122 } 3123 if (handled) { 3124 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 3125 } 3126 return handled; 3127 } 3128 3129 /** 3130 * Bring up the context menu for this view. 3131 * 3132 * @return Whether a context menu was displayed. 3133 */ 3134 public boolean showContextMenu() { 3135 return getParent().showContextMenuForChild(this); 3136 } 3137 3138 /** 3139 * Start an action mode. 3140 * 3141 * @param callback Callback that will control the lifecycle of the action mode 3142 * @return The new action mode if it is started, null otherwise 3143 * 3144 * @see ActionMode 3145 */ 3146 public ActionMode startActionMode(ActionMode.Callback callback) { 3147 return getParent().startActionModeForChild(this, callback); 3148 } 3149 3150 /** 3151 * Register a callback to be invoked when a key is pressed in this view. 3152 * @param l the key listener to attach to this view 3153 */ 3154 public void setOnKeyListener(OnKeyListener l) { 3155 mOnKeyListener = l; 3156 } 3157 3158 /** 3159 * Register a callback to be invoked when a touch event is sent to this view. 3160 * @param l the touch listener to attach to this view 3161 */ 3162 public void setOnTouchListener(OnTouchListener l) { 3163 mOnTouchListener = l; 3164 } 3165 3166 /** 3167 * Register a drag event listener callback object for this View. The parameter is 3168 * an implementation of {@link android.view.View.OnDragListener}. To send a drag event to a 3169 * View, the system calls the 3170 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent)} method. 3171 * @param l An implementation of {@link android.view.View.OnDragListener}. 3172 */ 3173 public void setOnDragListener(OnDragListener l) { 3174 mOnDragListener = l; 3175 } 3176 3177 /** 3178 * Give this view focus. This will cause {@link #onFocusChanged} to be called. 3179 * 3180 * Note: this does not check whether this {@link View} should get focus, it just 3181 * gives it focus no matter what. It should only be called internally by framework 3182 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3183 * 3184 * @param direction values are View.FOCUS_UP, View.FOCUS_DOWN, 3185 * View.FOCUS_LEFT or View.FOCUS_RIGHT. This is the direction which 3186 * focus moved when requestFocus() is called. It may not always 3187 * apply, in which case use the default View.FOCUS_DOWN. 3188 * @param previouslyFocusedRect The rectangle of the view that had focus 3189 * prior in this View's coordinate system. 3190 */ 3191 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3192 if (DBG) { 3193 System.out.println(this + " requestFocus()"); 3194 } 3195 3196 if ((mPrivateFlags & FOCUSED) == 0) { 3197 mPrivateFlags |= FOCUSED; 3198 3199 if (mParent != null) { 3200 mParent.requestChildFocus(this, this); 3201 } 3202 3203 onFocusChanged(true, direction, previouslyFocusedRect); 3204 refreshDrawableState(); 3205 } 3206 } 3207 3208 /** 3209 * Request that a rectangle of this view be visible on the screen, 3210 * scrolling if necessary just enough. 3211 * 3212 * <p>A View should call this if it maintains some notion of which part 3213 * of its content is interesting. For example, a text editing view 3214 * should call this when its cursor moves. 3215 * 3216 * @param rectangle The rectangle. 3217 * @return Whether any parent scrolled. 3218 */ 3219 public boolean requestRectangleOnScreen(Rect rectangle) { 3220 return requestRectangleOnScreen(rectangle, false); 3221 } 3222 3223 /** 3224 * Request that a rectangle of this view be visible on the screen, 3225 * scrolling if necessary just enough. 3226 * 3227 * <p>A View should call this if it maintains some notion of which part 3228 * of its content is interesting. For example, a text editing view 3229 * should call this when its cursor moves. 3230 * 3231 * <p>When <code>immediate</code> is set to true, scrolling will not be 3232 * animated. 3233 * 3234 * @param rectangle The rectangle. 3235 * @param immediate True to forbid animated scrolling, false otherwise 3236 * @return Whether any parent scrolled. 3237 */ 3238 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3239 View child = this; 3240 ViewParent parent = mParent; 3241 boolean scrolled = false; 3242 while (parent != null) { 3243 scrolled |= parent.requestChildRectangleOnScreen(child, 3244 rectangle, immediate); 3245 3246 // offset rect so next call has the rectangle in the 3247 // coordinate system of its direct child. 3248 rectangle.offset(child.getLeft(), child.getTop()); 3249 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3250 3251 if (!(parent instanceof View)) { 3252 break; 3253 } 3254 3255 child = (View) parent; 3256 parent = child.getParent(); 3257 } 3258 return scrolled; 3259 } 3260 3261 /** 3262 * Called when this view wants to give up focus. This will cause 3263 * {@link #onFocusChanged} to be called. 3264 */ 3265 public void clearFocus() { 3266 if (DBG) { 3267 System.out.println(this + " clearFocus()"); 3268 } 3269 3270 if ((mPrivateFlags & FOCUSED) != 0) { 3271 mPrivateFlags &= ~FOCUSED; 3272 3273 if (mParent != null) { 3274 mParent.clearChildFocus(this); 3275 } 3276 3277 onFocusChanged(false, 0, null); 3278 refreshDrawableState(); 3279 } 3280 } 3281 3282 /** 3283 * Called to clear the focus of a view that is about to be removed. 3284 * Doesn't call clearChildFocus, which prevents this view from taking 3285 * focus again before it has been removed from the parent 3286 */ 3287 void clearFocusForRemoval() { 3288 if ((mPrivateFlags & FOCUSED) != 0) { 3289 mPrivateFlags &= ~FOCUSED; 3290 3291 onFocusChanged(false, 0, null); 3292 refreshDrawableState(); 3293 } 3294 } 3295 3296 /** 3297 * Called internally by the view system when a new view is getting focus. 3298 * This is what clears the old focus. 3299 */ 3300 void unFocus() { 3301 if (DBG) { 3302 System.out.println(this + " unFocus()"); 3303 } 3304 3305 if ((mPrivateFlags & FOCUSED) != 0) { 3306 mPrivateFlags &= ~FOCUSED; 3307 3308 onFocusChanged(false, 0, null); 3309 refreshDrawableState(); 3310 } 3311 } 3312 3313 /** 3314 * Returns true if this view has focus iteself, or is the ancestor of the 3315 * view that has focus. 3316 * 3317 * @return True if this view has or contains focus, false otherwise. 3318 */ 3319 @ViewDebug.ExportedProperty(category = "focus") 3320 public boolean hasFocus() { 3321 return (mPrivateFlags & FOCUSED) != 0; 3322 } 3323 3324 /** 3325 * Returns true if this view is focusable or if it contains a reachable View 3326 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3327 * is a View whose parents do not block descendants focus. 3328 * 3329 * Only {@link #VISIBLE} views are considered focusable. 3330 * 3331 * @return True if the view is focusable or if the view contains a focusable 3332 * View, false otherwise. 3333 * 3334 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3335 */ 3336 public boolean hasFocusable() { 3337 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3338 } 3339 3340 /** 3341 * Called by the view system when the focus state of this view changes. 3342 * When the focus change event is caused by directional navigation, direction 3343 * and previouslyFocusedRect provide insight into where the focus is coming from. 3344 * When overriding, be sure to call up through to the super class so that 3345 * the standard focus handling will occur. 3346 * 3347 * @param gainFocus True if the View has focus; false otherwise. 3348 * @param direction The direction focus has moved when requestFocus() 3349 * is called to give this view focus. Values are 3350 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3351 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3352 * It may not always apply, in which case use the default. 3353 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3354 * system, of the previously focused view. If applicable, this will be 3355 * passed in as finer grained information about where the focus is coming 3356 * from (in addition to direction). Will be <code>null</code> otherwise. 3357 */ 3358 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3359 if (gainFocus) { 3360 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3361 } 3362 3363 InputMethodManager imm = InputMethodManager.peekInstance(); 3364 if (!gainFocus) { 3365 if (isPressed()) { 3366 setPressed(false); 3367 } 3368 if (imm != null && mAttachInfo != null 3369 && mAttachInfo.mHasWindowFocus) { 3370 imm.focusOut(this); 3371 } 3372 onFocusLost(); 3373 } else if (imm != null && mAttachInfo != null 3374 && mAttachInfo.mHasWindowFocus) { 3375 imm.focusIn(this); 3376 } 3377 3378 invalidate(true); 3379 if (mOnFocusChangeListener != null) { 3380 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3381 } 3382 3383 if (mAttachInfo != null) { 3384 mAttachInfo.mKeyDispatchState.reset(this); 3385 } 3386 } 3387 3388 /** 3389 * {@inheritDoc} 3390 */ 3391 public void sendAccessibilityEvent(int eventType) { 3392 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3393 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3394 } 3395 } 3396 3397 /** 3398 * {@inheritDoc} 3399 */ 3400 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3401 if (!isShown()) { 3402 return; 3403 } 3404 event.setClassName(getClass().getName()); 3405 event.setPackageName(getContext().getPackageName()); 3406 event.setEnabled(isEnabled()); 3407 event.setContentDescription(mContentDescription); 3408 3409 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 3410 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3411 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 3412 event.setItemCount(focusablesTempList.size()); 3413 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3414 focusablesTempList.clear(); 3415 } 3416 3417 dispatchPopulateAccessibilityEvent(event); 3418 3419 AccessibilityManager.getInstance(mContext).sendAccessibilityEvent(event); 3420 } 3421 3422 /** 3423 * Dispatches an {@link AccessibilityEvent} to the {@link View} children 3424 * to be populated. 3425 * 3426 * @param event The event. 3427 * 3428 * @return True if the event population was completed. 3429 */ 3430 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3431 return false; 3432 } 3433 3434 /** 3435 * Gets the {@link View} description. It briefly describes the view and is 3436 * primarily used for accessibility support. Set this property to enable 3437 * better accessibility support for your application. This is especially 3438 * true for views that do not have textual representation (For example, 3439 * ImageButton). 3440 * 3441 * @return The content descriptiopn. 3442 * 3443 * @attr ref android.R.styleable#View_contentDescription 3444 */ 3445 public CharSequence getContentDescription() { 3446 return mContentDescription; 3447 } 3448 3449 /** 3450 * Sets the {@link View} description. It briefly describes the view and is 3451 * primarily used for accessibility support. Set this property to enable 3452 * better accessibility support for your application. This is especially 3453 * true for views that do not have textual representation (For example, 3454 * ImageButton). 3455 * 3456 * @param contentDescription The content description. 3457 * 3458 * @attr ref android.R.styleable#View_contentDescription 3459 */ 3460 public void setContentDescription(CharSequence contentDescription) { 3461 mContentDescription = contentDescription; 3462 } 3463 3464 /** 3465 * Invoked whenever this view loses focus, either by losing window focus or by losing 3466 * focus within its window. This method can be used to clear any state tied to the 3467 * focus. For instance, if a button is held pressed with the trackball and the window 3468 * loses focus, this method can be used to cancel the press. 3469 * 3470 * Subclasses of View overriding this method should always call super.onFocusLost(). 3471 * 3472 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3473 * @see #onWindowFocusChanged(boolean) 3474 * 3475 * @hide pending API council approval 3476 */ 3477 protected void onFocusLost() { 3478 resetPressedState(); 3479 } 3480 3481 private void resetPressedState() { 3482 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3483 return; 3484 } 3485 3486 if (isPressed()) { 3487 setPressed(false); 3488 3489 if (!mHasPerformedLongPress) { 3490 removeLongPressCallback(); 3491 } 3492 } 3493 } 3494 3495 /** 3496 * Returns true if this view has focus 3497 * 3498 * @return True if this view has focus, false otherwise. 3499 */ 3500 @ViewDebug.ExportedProperty(category = "focus") 3501 public boolean isFocused() { 3502 return (mPrivateFlags & FOCUSED) != 0; 3503 } 3504 3505 /** 3506 * Find the view in the hierarchy rooted at this view that currently has 3507 * focus. 3508 * 3509 * @return The view that currently has focus, or null if no focused view can 3510 * be found. 3511 */ 3512 public View findFocus() { 3513 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3514 } 3515 3516 /** 3517 * Change whether this view is one of the set of scrollable containers in 3518 * its window. This will be used to determine whether the window can 3519 * resize or must pan when a soft input area is open -- scrollable 3520 * containers allow the window to use resize mode since the container 3521 * will appropriately shrink. 3522 */ 3523 public void setScrollContainer(boolean isScrollContainer) { 3524 if (isScrollContainer) { 3525 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3526 mAttachInfo.mScrollContainers.add(this); 3527 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3528 } 3529 mPrivateFlags |= SCROLL_CONTAINER; 3530 } else { 3531 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3532 mAttachInfo.mScrollContainers.remove(this); 3533 } 3534 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3535 } 3536 } 3537 3538 /** 3539 * Returns the quality of the drawing cache. 3540 * 3541 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3542 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3543 * 3544 * @see #setDrawingCacheQuality(int) 3545 * @see #setDrawingCacheEnabled(boolean) 3546 * @see #isDrawingCacheEnabled() 3547 * 3548 * @attr ref android.R.styleable#View_drawingCacheQuality 3549 */ 3550 public int getDrawingCacheQuality() { 3551 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3552 } 3553 3554 /** 3555 * Set the drawing cache quality of this view. This value is used only when the 3556 * drawing cache is enabled 3557 * 3558 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3559 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3560 * 3561 * @see #getDrawingCacheQuality() 3562 * @see #setDrawingCacheEnabled(boolean) 3563 * @see #isDrawingCacheEnabled() 3564 * 3565 * @attr ref android.R.styleable#View_drawingCacheQuality 3566 */ 3567 public void setDrawingCacheQuality(int quality) { 3568 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3569 } 3570 3571 /** 3572 * Returns whether the screen should remain on, corresponding to the current 3573 * value of {@link #KEEP_SCREEN_ON}. 3574 * 3575 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3576 * 3577 * @see #setKeepScreenOn(boolean) 3578 * 3579 * @attr ref android.R.styleable#View_keepScreenOn 3580 */ 3581 public boolean getKeepScreenOn() { 3582 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3583 } 3584 3585 /** 3586 * Controls whether the screen should remain on, modifying the 3587 * value of {@link #KEEP_SCREEN_ON}. 3588 * 3589 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3590 * 3591 * @see #getKeepScreenOn() 3592 * 3593 * @attr ref android.R.styleable#View_keepScreenOn 3594 */ 3595 public void setKeepScreenOn(boolean keepScreenOn) { 3596 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3597 } 3598 3599 /** 3600 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3601 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3602 * 3603 * @attr ref android.R.styleable#View_nextFocusLeft 3604 */ 3605 public int getNextFocusLeftId() { 3606 return mNextFocusLeftId; 3607 } 3608 3609 /** 3610 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3611 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 3612 * decide automatically. 3613 * 3614 * @attr ref android.R.styleable#View_nextFocusLeft 3615 */ 3616 public void setNextFocusLeftId(int nextFocusLeftId) { 3617 mNextFocusLeftId = nextFocusLeftId; 3618 } 3619 3620 /** 3621 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3622 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3623 * 3624 * @attr ref android.R.styleable#View_nextFocusRight 3625 */ 3626 public int getNextFocusRightId() { 3627 return mNextFocusRightId; 3628 } 3629 3630 /** 3631 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3632 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 3633 * decide automatically. 3634 * 3635 * @attr ref android.R.styleable#View_nextFocusRight 3636 */ 3637 public void setNextFocusRightId(int nextFocusRightId) { 3638 mNextFocusRightId = nextFocusRightId; 3639 } 3640 3641 /** 3642 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3643 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3644 * 3645 * @attr ref android.R.styleable#View_nextFocusUp 3646 */ 3647 public int getNextFocusUpId() { 3648 return mNextFocusUpId; 3649 } 3650 3651 /** 3652 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3653 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 3654 * decide automatically. 3655 * 3656 * @attr ref android.R.styleable#View_nextFocusUp 3657 */ 3658 public void setNextFocusUpId(int nextFocusUpId) { 3659 mNextFocusUpId = nextFocusUpId; 3660 } 3661 3662 /** 3663 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3664 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3665 * 3666 * @attr ref android.R.styleable#View_nextFocusDown 3667 */ 3668 public int getNextFocusDownId() { 3669 return mNextFocusDownId; 3670 } 3671 3672 /** 3673 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3674 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 3675 * decide automatically. 3676 * 3677 * @attr ref android.R.styleable#View_nextFocusDown 3678 */ 3679 public void setNextFocusDownId(int nextFocusDownId) { 3680 mNextFocusDownId = nextFocusDownId; 3681 } 3682 3683 /** 3684 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3685 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3686 * 3687 * @attr ref android.R.styleable#View_nextFocusForward 3688 */ 3689 public int getNextFocusForwardId() { 3690 return mNextFocusForwardId; 3691 } 3692 3693 /** 3694 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3695 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 3696 * decide automatically. 3697 * 3698 * @attr ref android.R.styleable#View_nextFocusForward 3699 */ 3700 public void setNextFocusForwardId(int nextFocusForwardId) { 3701 mNextFocusForwardId = nextFocusForwardId; 3702 } 3703 3704 /** 3705 * Returns the visibility of this view and all of its ancestors 3706 * 3707 * @return True if this view and all of its ancestors are {@link #VISIBLE} 3708 */ 3709 public boolean isShown() { 3710 View current = this; 3711 //noinspection ConstantConditions 3712 do { 3713 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3714 return false; 3715 } 3716 ViewParent parent = current.mParent; 3717 if (parent == null) { 3718 return false; // We are not attached to the view root 3719 } 3720 if (!(parent instanceof View)) { 3721 return true; 3722 } 3723 current = (View) parent; 3724 } while (current != null); 3725 3726 return false; 3727 } 3728 3729 /** 3730 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 3731 * is set 3732 * 3733 * @param insets Insets for system windows 3734 * 3735 * @return True if this view applied the insets, false otherwise 3736 */ 3737 protected boolean fitSystemWindows(Rect insets) { 3738 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 3739 mPaddingLeft = insets.left; 3740 mPaddingTop = insets.top; 3741 mPaddingRight = insets.right; 3742 mPaddingBottom = insets.bottom; 3743 requestLayout(); 3744 return true; 3745 } 3746 return false; 3747 } 3748 3749 /** 3750 * Determine if this view has the FITS_SYSTEM_WINDOWS flag set. 3751 * @return True if window has FITS_SYSTEM_WINDOWS set 3752 * 3753 * @hide 3754 */ 3755 public boolean isFitsSystemWindowsFlagSet() { 3756 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 3757 } 3758 3759 /** 3760 * Returns the visibility status for this view. 3761 * 3762 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3763 * @attr ref android.R.styleable#View_visibility 3764 */ 3765 @ViewDebug.ExportedProperty(mapping = { 3766 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 3767 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 3768 @ViewDebug.IntToString(from = GONE, to = "GONE") 3769 }) 3770 public int getVisibility() { 3771 return mViewFlags & VISIBILITY_MASK; 3772 } 3773 3774 /** 3775 * Set the enabled state of this view. 3776 * 3777 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3778 * @attr ref android.R.styleable#View_visibility 3779 */ 3780 @RemotableViewMethod 3781 public void setVisibility(int visibility) { 3782 setFlags(visibility, VISIBILITY_MASK); 3783 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 3784 } 3785 3786 /** 3787 * Returns the enabled status for this view. The interpretation of the 3788 * enabled state varies by subclass. 3789 * 3790 * @return True if this view is enabled, false otherwise. 3791 */ 3792 @ViewDebug.ExportedProperty 3793 public boolean isEnabled() { 3794 return (mViewFlags & ENABLED_MASK) == ENABLED; 3795 } 3796 3797 /** 3798 * Set the enabled state of this view. The interpretation of the enabled 3799 * state varies by subclass. 3800 * 3801 * @param enabled True if this view is enabled, false otherwise. 3802 */ 3803 @RemotableViewMethod 3804 public void setEnabled(boolean enabled) { 3805 if (enabled == isEnabled()) return; 3806 3807 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 3808 3809 /* 3810 * The View most likely has to change its appearance, so refresh 3811 * the drawable state. 3812 */ 3813 refreshDrawableState(); 3814 3815 // Invalidate too, since the default behavior for views is to be 3816 // be drawn at 50% alpha rather than to change the drawable. 3817 invalidate(true); 3818 } 3819 3820 /** 3821 * Set whether this view can receive the focus. 3822 * 3823 * Setting this to false will also ensure that this view is not focusable 3824 * in touch mode. 3825 * 3826 * @param focusable If true, this view can receive the focus. 3827 * 3828 * @see #setFocusableInTouchMode(boolean) 3829 * @attr ref android.R.styleable#View_focusable 3830 */ 3831 public void setFocusable(boolean focusable) { 3832 if (!focusable) { 3833 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 3834 } 3835 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 3836 } 3837 3838 /** 3839 * Set whether this view can receive focus while in touch mode. 3840 * 3841 * Setting this to true will also ensure that this view is focusable. 3842 * 3843 * @param focusableInTouchMode If true, this view can receive the focus while 3844 * in touch mode. 3845 * 3846 * @see #setFocusable(boolean) 3847 * @attr ref android.R.styleable#View_focusableInTouchMode 3848 */ 3849 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 3850 // Focusable in touch mode should always be set before the focusable flag 3851 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 3852 // which, in touch mode, will not successfully request focus on this view 3853 // because the focusable in touch mode flag is not set 3854 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 3855 if (focusableInTouchMode) { 3856 setFlags(FOCUSABLE, FOCUSABLE_MASK); 3857 } 3858 } 3859 3860 /** 3861 * Set whether this view should have sound effects enabled for events such as 3862 * clicking and touching. 3863 * 3864 * <p>You may wish to disable sound effects for a view if you already play sounds, 3865 * for instance, a dial key that plays dtmf tones. 3866 * 3867 * @param soundEffectsEnabled whether sound effects are enabled for this view. 3868 * @see #isSoundEffectsEnabled() 3869 * @see #playSoundEffect(int) 3870 * @attr ref android.R.styleable#View_soundEffectsEnabled 3871 */ 3872 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 3873 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 3874 } 3875 3876 /** 3877 * @return whether this view should have sound effects enabled for events such as 3878 * clicking and touching. 3879 * 3880 * @see #setSoundEffectsEnabled(boolean) 3881 * @see #playSoundEffect(int) 3882 * @attr ref android.R.styleable#View_soundEffectsEnabled 3883 */ 3884 @ViewDebug.ExportedProperty 3885 public boolean isSoundEffectsEnabled() { 3886 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 3887 } 3888 3889 /** 3890 * Set whether this view should have haptic feedback for events such as 3891 * long presses. 3892 * 3893 * <p>You may wish to disable haptic feedback if your view already controls 3894 * its own haptic feedback. 3895 * 3896 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 3897 * @see #isHapticFeedbackEnabled() 3898 * @see #performHapticFeedback(int) 3899 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3900 */ 3901 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 3902 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 3903 } 3904 3905 /** 3906 * @return whether this view should have haptic feedback enabled for events 3907 * long presses. 3908 * 3909 * @see #setHapticFeedbackEnabled(boolean) 3910 * @see #performHapticFeedback(int) 3911 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3912 */ 3913 @ViewDebug.ExportedProperty 3914 public boolean isHapticFeedbackEnabled() { 3915 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 3916 } 3917 3918 /** 3919 * If this view doesn't do any drawing on its own, set this flag to 3920 * allow further optimizations. By default, this flag is not set on 3921 * View, but could be set on some View subclasses such as ViewGroup. 3922 * 3923 * Typically, if you override {@link #onDraw} you should clear this flag. 3924 * 3925 * @param willNotDraw whether or not this View draw on its own 3926 */ 3927 public void setWillNotDraw(boolean willNotDraw) { 3928 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 3929 } 3930 3931 /** 3932 * Returns whether or not this View draws on its own. 3933 * 3934 * @return true if this view has nothing to draw, false otherwise 3935 */ 3936 @ViewDebug.ExportedProperty(category = "drawing") 3937 public boolean willNotDraw() { 3938 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 3939 } 3940 3941 /** 3942 * When a View's drawing cache is enabled, drawing is redirected to an 3943 * offscreen bitmap. Some views, like an ImageView, must be able to 3944 * bypass this mechanism if they already draw a single bitmap, to avoid 3945 * unnecessary usage of the memory. 3946 * 3947 * @param willNotCacheDrawing true if this view does not cache its 3948 * drawing, false otherwise 3949 */ 3950 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 3951 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 3952 } 3953 3954 /** 3955 * Returns whether or not this View can cache its drawing or not. 3956 * 3957 * @return true if this view does not cache its drawing, false otherwise 3958 */ 3959 @ViewDebug.ExportedProperty(category = "drawing") 3960 public boolean willNotCacheDrawing() { 3961 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 3962 } 3963 3964 /** 3965 * Indicates whether this view reacts to click events or not. 3966 * 3967 * @return true if the view is clickable, false otherwise 3968 * 3969 * @see #setClickable(boolean) 3970 * @attr ref android.R.styleable#View_clickable 3971 */ 3972 @ViewDebug.ExportedProperty 3973 public boolean isClickable() { 3974 return (mViewFlags & CLICKABLE) == CLICKABLE; 3975 } 3976 3977 /** 3978 * Enables or disables click events for this view. When a view 3979 * is clickable it will change its state to "pressed" on every click. 3980 * Subclasses should set the view clickable to visually react to 3981 * user's clicks. 3982 * 3983 * @param clickable true to make the view clickable, false otherwise 3984 * 3985 * @see #isClickable() 3986 * @attr ref android.R.styleable#View_clickable 3987 */ 3988 public void setClickable(boolean clickable) { 3989 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 3990 } 3991 3992 /** 3993 * Indicates whether this view reacts to long click events or not. 3994 * 3995 * @return true if the view is long clickable, false otherwise 3996 * 3997 * @see #setLongClickable(boolean) 3998 * @attr ref android.R.styleable#View_longClickable 3999 */ 4000 public boolean isLongClickable() { 4001 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 4002 } 4003 4004 /** 4005 * Enables or disables long click events for this view. When a view is long 4006 * clickable it reacts to the user holding down the button for a longer 4007 * duration than a tap. This event can either launch the listener or a 4008 * context menu. 4009 * 4010 * @param longClickable true to make the view long clickable, false otherwise 4011 * @see #isLongClickable() 4012 * @attr ref android.R.styleable#View_longClickable 4013 */ 4014 public void setLongClickable(boolean longClickable) { 4015 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 4016 } 4017 4018 /** 4019 * Sets the pressed state for this view. 4020 * 4021 * @see #isClickable() 4022 * @see #setClickable(boolean) 4023 * 4024 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 4025 * the View's internal state from a previously set "pressed" state. 4026 */ 4027 public void setPressed(boolean pressed) { 4028 if (pressed) { 4029 mPrivateFlags |= PRESSED; 4030 } else { 4031 mPrivateFlags &= ~PRESSED; 4032 } 4033 refreshDrawableState(); 4034 dispatchSetPressed(pressed); 4035 } 4036 4037 /** 4038 * Dispatch setPressed to all of this View's children. 4039 * 4040 * @see #setPressed(boolean) 4041 * 4042 * @param pressed The new pressed state 4043 */ 4044 protected void dispatchSetPressed(boolean pressed) { 4045 } 4046 4047 /** 4048 * Indicates whether the view is currently in pressed state. Unless 4049 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 4050 * the pressed state. 4051 * 4052 * @see #setPressed 4053 * @see #isClickable() 4054 * @see #setClickable(boolean) 4055 * 4056 * @return true if the view is currently pressed, false otherwise 4057 */ 4058 public boolean isPressed() { 4059 return (mPrivateFlags & PRESSED) == PRESSED; 4060 } 4061 4062 /** 4063 * Indicates whether this view will save its state (that is, 4064 * whether its {@link #onSaveInstanceState} method will be called). 4065 * 4066 * @return Returns true if the view state saving is enabled, else false. 4067 * 4068 * @see #setSaveEnabled(boolean) 4069 * @attr ref android.R.styleable#View_saveEnabled 4070 */ 4071 public boolean isSaveEnabled() { 4072 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 4073 } 4074 4075 /** 4076 * Controls whether the saving of this view's state is 4077 * enabled (that is, whether its {@link #onSaveInstanceState} method 4078 * will be called). Note that even if freezing is enabled, the 4079 * view still must have an id assigned to it (via {@link #setId setId()}) 4080 * for its state to be saved. This flag can only disable the 4081 * saving of this view; any child views may still have their state saved. 4082 * 4083 * @param enabled Set to false to <em>disable</em> state saving, or true 4084 * (the default) to allow it. 4085 * 4086 * @see #isSaveEnabled() 4087 * @see #setId(int) 4088 * @see #onSaveInstanceState() 4089 * @attr ref android.R.styleable#View_saveEnabled 4090 */ 4091 public void setSaveEnabled(boolean enabled) { 4092 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 4093 } 4094 4095 /** 4096 * Gets whether the framework should discard touches when the view's 4097 * window is obscured by another visible window. 4098 * Refer to the {@link View} security documentation for more details. 4099 * 4100 * @return True if touch filtering is enabled. 4101 * 4102 * @see #setFilterTouchesWhenObscured(boolean) 4103 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4104 */ 4105 @ViewDebug.ExportedProperty 4106 public boolean getFilterTouchesWhenObscured() { 4107 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 4108 } 4109 4110 /** 4111 * Sets whether the framework should discard touches when the view's 4112 * window is obscured by another visible window. 4113 * Refer to the {@link View} security documentation for more details. 4114 * 4115 * @param enabled True if touch filtering should be enabled. 4116 * 4117 * @see #getFilterTouchesWhenObscured 4118 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 4119 */ 4120 public void setFilterTouchesWhenObscured(boolean enabled) { 4121 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 4122 FILTER_TOUCHES_WHEN_OBSCURED); 4123 } 4124 4125 /** 4126 * Indicates whether the entire hierarchy under this view will save its 4127 * state when a state saving traversal occurs from its parent. The default 4128 * is true; if false, these views will not be saved unless 4129 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4130 * 4131 * @return Returns true if the view state saving from parent is enabled, else false. 4132 * 4133 * @see #setSaveFromParentEnabled(boolean) 4134 */ 4135 public boolean isSaveFromParentEnabled() { 4136 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 4137 } 4138 4139 /** 4140 * Controls whether the entire hierarchy under this view will save its 4141 * state when a state saving traversal occurs from its parent. The default 4142 * is true; if false, these views will not be saved unless 4143 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4144 * 4145 * @param enabled Set to false to <em>disable</em> state saving, or true 4146 * (the default) to allow it. 4147 * 4148 * @see #isSaveFromParentEnabled() 4149 * @see #setId(int) 4150 * @see #onSaveInstanceState() 4151 */ 4152 public void setSaveFromParentEnabled(boolean enabled) { 4153 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4154 } 4155 4156 4157 /** 4158 * Returns whether this View is able to take focus. 4159 * 4160 * @return True if this view can take focus, or false otherwise. 4161 * @attr ref android.R.styleable#View_focusable 4162 */ 4163 @ViewDebug.ExportedProperty(category = "focus") 4164 public final boolean isFocusable() { 4165 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4166 } 4167 4168 /** 4169 * When a view is focusable, it may not want to take focus when in touch mode. 4170 * For example, a button would like focus when the user is navigating via a D-pad 4171 * so that the user can click on it, but once the user starts touching the screen, 4172 * the button shouldn't take focus 4173 * @return Whether the view is focusable in touch mode. 4174 * @attr ref android.R.styleable#View_focusableInTouchMode 4175 */ 4176 @ViewDebug.ExportedProperty 4177 public final boolean isFocusableInTouchMode() { 4178 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4179 } 4180 4181 /** 4182 * Find the nearest view in the specified direction that can take focus. 4183 * This does not actually give focus to that view. 4184 * 4185 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4186 * 4187 * @return The nearest focusable in the specified direction, or null if none 4188 * can be found. 4189 */ 4190 public View focusSearch(int direction) { 4191 if (mParent != null) { 4192 return mParent.focusSearch(this, direction); 4193 } else { 4194 return null; 4195 } 4196 } 4197 4198 /** 4199 * This method is the last chance for the focused view and its ancestors to 4200 * respond to an arrow key. This is called when the focused view did not 4201 * consume the key internally, nor could the view system find a new view in 4202 * the requested direction to give focus to. 4203 * 4204 * @param focused The currently focused view. 4205 * @param direction The direction focus wants to move. One of FOCUS_UP, 4206 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4207 * @return True if the this view consumed this unhandled move. 4208 */ 4209 public boolean dispatchUnhandledMove(View focused, int direction) { 4210 return false; 4211 } 4212 4213 /** 4214 * If a user manually specified the next view id for a particular direction, 4215 * use the root to look up the view. 4216 * @param root The root view of the hierarchy containing this view. 4217 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4218 * or FOCUS_BACKWARD. 4219 * @return The user specified next view, or null if there is none. 4220 */ 4221 View findUserSetNextFocus(View root, int direction) { 4222 switch (direction) { 4223 case FOCUS_LEFT: 4224 if (mNextFocusLeftId == View.NO_ID) return null; 4225 return findViewShouldExist(root, mNextFocusLeftId); 4226 case FOCUS_RIGHT: 4227 if (mNextFocusRightId == View.NO_ID) return null; 4228 return findViewShouldExist(root, mNextFocusRightId); 4229 case FOCUS_UP: 4230 if (mNextFocusUpId == View.NO_ID) return null; 4231 return findViewShouldExist(root, mNextFocusUpId); 4232 case FOCUS_DOWN: 4233 if (mNextFocusDownId == View.NO_ID) return null; 4234 return findViewShouldExist(root, mNextFocusDownId); 4235 case FOCUS_FORWARD: 4236 if (mNextFocusForwardId == View.NO_ID) return null; 4237 return findViewShouldExist(root, mNextFocusForwardId); 4238 case FOCUS_BACKWARD: { 4239 final int id = mID; 4240 return root.findViewByPredicate(new Predicate<View>() { 4241 @Override 4242 public boolean apply(View t) { 4243 return t.mNextFocusForwardId == id; 4244 } 4245 }); 4246 } 4247 } 4248 return null; 4249 } 4250 4251 private static View findViewShouldExist(View root, int childViewId) { 4252 View result = root.findViewById(childViewId); 4253 if (result == null) { 4254 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4255 + "by user for id " + childViewId); 4256 } 4257 return result; 4258 } 4259 4260 /** 4261 * Find and return all focusable views that are descendants of this view, 4262 * possibly including this view if it is focusable itself. 4263 * 4264 * @param direction The direction of the focus 4265 * @return A list of focusable views 4266 */ 4267 public ArrayList<View> getFocusables(int direction) { 4268 ArrayList<View> result = new ArrayList<View>(24); 4269 addFocusables(result, direction); 4270 return result; 4271 } 4272 4273 /** 4274 * Add any focusable views that are descendants of this view (possibly 4275 * including this view if it is focusable itself) to views. If we are in touch mode, 4276 * only add views that are also focusable in touch mode. 4277 * 4278 * @param views Focusable views found so far 4279 * @param direction The direction of the focus 4280 */ 4281 public void addFocusables(ArrayList<View> views, int direction) { 4282 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4283 } 4284 4285 /** 4286 * Adds any focusable views that are descendants of this view (possibly 4287 * including this view if it is focusable itself) to views. This method 4288 * adds all focusable views regardless if we are in touch mode or 4289 * only views focusable in touch mode if we are in touch mode depending on 4290 * the focusable mode paramater. 4291 * 4292 * @param views Focusable views found so far or null if all we are interested is 4293 * the number of focusables. 4294 * @param direction The direction of the focus. 4295 * @param focusableMode The type of focusables to be added. 4296 * 4297 * @see #FOCUSABLES_ALL 4298 * @see #FOCUSABLES_TOUCH_MODE 4299 */ 4300 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4301 if (!isFocusable()) { 4302 return; 4303 } 4304 4305 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4306 isInTouchMode() && !isFocusableInTouchMode()) { 4307 return; 4308 } 4309 4310 if (views != null) { 4311 views.add(this); 4312 } 4313 } 4314 4315 /** 4316 * Find and return all touchable views that are descendants of this view, 4317 * possibly including this view if it is touchable itself. 4318 * 4319 * @return A list of touchable views 4320 */ 4321 public ArrayList<View> getTouchables() { 4322 ArrayList<View> result = new ArrayList<View>(); 4323 addTouchables(result); 4324 return result; 4325 } 4326 4327 /** 4328 * Add any touchable views that are descendants of this view (possibly 4329 * including this view if it is touchable itself) to views. 4330 * 4331 * @param views Touchable views found so far 4332 */ 4333 public void addTouchables(ArrayList<View> views) { 4334 final int viewFlags = mViewFlags; 4335 4336 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 4337 && (viewFlags & ENABLED_MASK) == ENABLED) { 4338 views.add(this); 4339 } 4340 } 4341 4342 /** 4343 * Call this to try to give focus to a specific view or to one of its 4344 * descendants. 4345 * 4346 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4347 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4348 * while the device is in touch mode. 4349 * 4350 * See also {@link #focusSearch}, which is what you call to say that you 4351 * have focus, and you want your parent to look for the next one. 4352 * 4353 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 4354 * {@link #FOCUS_DOWN} and <code>null</code>. 4355 * 4356 * @return Whether this view or one of its descendants actually took focus. 4357 */ 4358 public final boolean requestFocus() { 4359 return requestFocus(View.FOCUS_DOWN); 4360 } 4361 4362 4363 /** 4364 * Call this to try to give focus to a specific view or to one of its 4365 * descendants and give it a hint about what direction focus is heading. 4366 * 4367 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4368 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4369 * while the device is in touch mode. 4370 * 4371 * See also {@link #focusSearch}, which is what you call to say that you 4372 * have focus, and you want your parent to look for the next one. 4373 * 4374 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 4375 * <code>null</code> set for the previously focused rectangle. 4376 * 4377 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4378 * @return Whether this view or one of its descendants actually took focus. 4379 */ 4380 public final boolean requestFocus(int direction) { 4381 return requestFocus(direction, null); 4382 } 4383 4384 /** 4385 * Call this to try to give focus to a specific view or to one of its descendants 4386 * and give it hints about the direction and a specific rectangle that the focus 4387 * is coming from. The rectangle can help give larger views a finer grained hint 4388 * about where focus is coming from, and therefore, where to show selection, or 4389 * forward focus change internally. 4390 * 4391 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4392 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4393 * while the device is in touch mode. 4394 * 4395 * A View will not take focus if it is not visible. 4396 * 4397 * A View will not take focus if one of its parents has {@link android.view.ViewGroup#getDescendantFocusability()} 4398 * equal to {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 4399 * 4400 * See also {@link #focusSearch}, which is what you call to say that you 4401 * have focus, and you want your parent to look for the next one. 4402 * 4403 * You may wish to override this method if your custom {@link View} has an internal 4404 * {@link View} that it wishes to forward the request to. 4405 * 4406 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4407 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 4408 * to give a finer grained hint about where focus is coming from. May be null 4409 * if there is no hint. 4410 * @return Whether this view or one of its descendants actually took focus. 4411 */ 4412 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 4413 // need to be focusable 4414 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 4415 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4416 return false; 4417 } 4418 4419 // need to be focusable in touch mode if in touch mode 4420 if (isInTouchMode() && 4421 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 4422 return false; 4423 } 4424 4425 // need to not have any parents blocking us 4426 if (hasAncestorThatBlocksDescendantFocus()) { 4427 return false; 4428 } 4429 4430 handleFocusGainInternal(direction, previouslyFocusedRect); 4431 return true; 4432 } 4433 4434 /** Gets the ViewRoot, or null if not attached. */ 4435 /*package*/ ViewRoot getViewRoot() { 4436 View root = getRootView(); 4437 return root != null ? (ViewRoot)root.getParent() : null; 4438 } 4439 4440 /** 4441 * Call this to try to give focus to a specific view or to one of its descendants. This is a 4442 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 4443 * touch mode to request focus when they are touched. 4444 * 4445 * @return Whether this view or one of its descendants actually took focus. 4446 * 4447 * @see #isInTouchMode() 4448 * 4449 */ 4450 public final boolean requestFocusFromTouch() { 4451 // Leave touch mode if we need to 4452 if (isInTouchMode()) { 4453 ViewRoot viewRoot = getViewRoot(); 4454 if (viewRoot != null) { 4455 viewRoot.ensureTouchMode(false); 4456 } 4457 } 4458 return requestFocus(View.FOCUS_DOWN); 4459 } 4460 4461 /** 4462 * @return Whether any ancestor of this view blocks descendant focus. 4463 */ 4464 private boolean hasAncestorThatBlocksDescendantFocus() { 4465 ViewParent ancestor = mParent; 4466 while (ancestor instanceof ViewGroup) { 4467 final ViewGroup vgAncestor = (ViewGroup) ancestor; 4468 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 4469 return true; 4470 } else { 4471 ancestor = vgAncestor.getParent(); 4472 } 4473 } 4474 return false; 4475 } 4476 4477 /** 4478 * @hide 4479 */ 4480 public void dispatchStartTemporaryDetach() { 4481 onStartTemporaryDetach(); 4482 } 4483 4484 /** 4485 * This is called when a container is going to temporarily detach a child, with 4486 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4487 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4488 * {@link #onDetachedFromWindow()} when the container is done. 4489 */ 4490 public void onStartTemporaryDetach() { 4491 removeUnsetPressCallback(); 4492 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4493 } 4494 4495 /** 4496 * @hide 4497 */ 4498 public void dispatchFinishTemporaryDetach() { 4499 onFinishTemporaryDetach(); 4500 } 4501 4502 /** 4503 * Called after {@link #onStartTemporaryDetach} when the container is done 4504 * changing the view. 4505 */ 4506 public void onFinishTemporaryDetach() { 4507 } 4508 4509 /** 4510 * capture information of this view for later analysis: developement only 4511 * check dynamic switch to make sure we only dump view 4512 * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set 4513 */ 4514 private static void captureViewInfo(String subTag, View v) { 4515 if (v == null || SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) { 4516 return; 4517 } 4518 ViewDebug.dumpCapturedView(subTag, v); 4519 } 4520 4521 /** 4522 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4523 * for this view's window. Returns null if the view is not currently attached 4524 * to the window. Normally you will not need to use this directly, but 4525 * just use the standard high-level event callbacks like {@link #onKeyDown}. 4526 */ 4527 public KeyEvent.DispatcherState getKeyDispatcherState() { 4528 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4529 } 4530 4531 /** 4532 * Dispatch a key event before it is processed by any input method 4533 * associated with the view hierarchy. This can be used to intercept 4534 * key events in special situations before the IME consumes them; a 4535 * typical example would be handling the BACK key to update the application's 4536 * UI instead of allowing the IME to see it and close itself. 4537 * 4538 * @param event The key event to be dispatched. 4539 * @return True if the event was handled, false otherwise. 4540 */ 4541 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4542 return onKeyPreIme(event.getKeyCode(), event); 4543 } 4544 4545 /** 4546 * Dispatch a key event to the next view on the focus path. This path runs 4547 * from the top of the view tree down to the currently focused view. If this 4548 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4549 * the next node down the focus path. This method also fires any key 4550 * listeners. 4551 * 4552 * @param event The key event to be dispatched. 4553 * @return True if the event was handled, false otherwise. 4554 */ 4555 public boolean dispatchKeyEvent(KeyEvent event) { 4556 // If any attached key listener a first crack at the event. 4557 4558 //noinspection SimplifiableIfStatement,deprecation 4559 if (android.util.Config.LOGV) { 4560 captureViewInfo("captureViewKeyEvent", this); 4561 } 4562 4563 //noinspection SimplifiableIfStatement 4564 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4565 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4566 return true; 4567 } 4568 4569 return event.dispatch(this, mAttachInfo != null 4570 ? mAttachInfo.mKeyDispatchState : null, this); 4571 } 4572 4573 /** 4574 * Dispatches a key shortcut event. 4575 * 4576 * @param event The key event to be dispatched. 4577 * @return True if the event was handled by the view, false otherwise. 4578 */ 4579 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 4580 return onKeyShortcut(event.getKeyCode(), event); 4581 } 4582 4583 /** 4584 * Pass the touch screen motion event down to the target view, or this 4585 * view if it is the target. 4586 * 4587 * @param event The motion event to be dispatched. 4588 * @return True if the event was handled by the view, false otherwise. 4589 */ 4590 public boolean dispatchTouchEvent(MotionEvent event) { 4591 if (!onFilterTouchEventForSecurity(event)) { 4592 return false; 4593 } 4594 4595 //noinspection SimplifiableIfStatement 4596 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 4597 mOnTouchListener.onTouch(this, event)) { 4598 return true; 4599 } 4600 return onTouchEvent(event); 4601 } 4602 4603 /** 4604 * Filter the touch event to apply security policies. 4605 * 4606 * @param event The motion event to be filtered. 4607 * @return True if the event should be dispatched, false if the event should be dropped. 4608 * 4609 * @see #getFilterTouchesWhenObscured 4610 */ 4611 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 4612 //noinspection RedundantIfStatement 4613 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 4614 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 4615 // Window is obscured, drop this touch. 4616 return false; 4617 } 4618 return true; 4619 } 4620 4621 /** 4622 * Pass a trackball motion event down to the focused view. 4623 * 4624 * @param event The motion event to be dispatched. 4625 * @return True if the event was handled by the view, false otherwise. 4626 */ 4627 public boolean dispatchTrackballEvent(MotionEvent event) { 4628 //Log.i("view", "view=" + this + ", " + event.toString()); 4629 return onTrackballEvent(event); 4630 } 4631 4632 /** 4633 * Called when the window containing this view gains or loses window focus. 4634 * ViewGroups should override to route to their children. 4635 * 4636 * @param hasFocus True if the window containing this view now has focus, 4637 * false otherwise. 4638 */ 4639 public void dispatchWindowFocusChanged(boolean hasFocus) { 4640 onWindowFocusChanged(hasFocus); 4641 } 4642 4643 /** 4644 * Called when the window containing this view gains or loses focus. Note 4645 * that this is separate from view focus: to receive key events, both 4646 * your view and its window must have focus. If a window is displayed 4647 * on top of yours that takes input focus, then your own window will lose 4648 * focus but the view focus will remain unchanged. 4649 * 4650 * @param hasWindowFocus True if the window containing this view now has 4651 * focus, false otherwise. 4652 */ 4653 public void onWindowFocusChanged(boolean hasWindowFocus) { 4654 InputMethodManager imm = InputMethodManager.peekInstance(); 4655 if (!hasWindowFocus) { 4656 if (isPressed()) { 4657 setPressed(false); 4658 } 4659 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4660 imm.focusOut(this); 4661 } 4662 removeLongPressCallback(); 4663 removeTapCallback(); 4664 onFocusLost(); 4665 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4666 imm.focusIn(this); 4667 } 4668 refreshDrawableState(); 4669 } 4670 4671 /** 4672 * Returns true if this view is in a window that currently has window focus. 4673 * Note that this is not the same as the view itself having focus. 4674 * 4675 * @return True if this view is in a window that currently has window focus. 4676 */ 4677 public boolean hasWindowFocus() { 4678 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 4679 } 4680 4681 /** 4682 * Dispatch a view visibility change down the view hierarchy. 4683 * ViewGroups should override to route to their children. 4684 * @param changedView The view whose visibility changed. Could be 'this' or 4685 * an ancestor view. 4686 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4687 * {@link #INVISIBLE} or {@link #GONE}. 4688 */ 4689 protected void dispatchVisibilityChanged(View changedView, int visibility) { 4690 onVisibilityChanged(changedView, visibility); 4691 } 4692 4693 /** 4694 * Called when the visibility of the view or an ancestor of the view is changed. 4695 * @param changedView The view whose visibility changed. Could be 'this' or 4696 * an ancestor view. 4697 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4698 * {@link #INVISIBLE} or {@link #GONE}. 4699 */ 4700 protected void onVisibilityChanged(View changedView, int visibility) { 4701 if (visibility == VISIBLE) { 4702 if (mAttachInfo != null) { 4703 initialAwakenScrollBars(); 4704 } else { 4705 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 4706 } 4707 } 4708 } 4709 4710 /** 4711 * Dispatch a hint about whether this view is displayed. For instance, when 4712 * a View moves out of the screen, it might receives a display hint indicating 4713 * the view is not displayed. Applications should not <em>rely</em> on this hint 4714 * as there is no guarantee that they will receive one. 4715 * 4716 * @param hint A hint about whether or not this view is displayed: 4717 * {@link #VISIBLE} or {@link #INVISIBLE}. 4718 */ 4719 public void dispatchDisplayHint(int hint) { 4720 onDisplayHint(hint); 4721 } 4722 4723 /** 4724 * Gives this view a hint about whether is displayed or not. For instance, when 4725 * a View moves out of the screen, it might receives a display hint indicating 4726 * the view is not displayed. Applications should not <em>rely</em> on this hint 4727 * as there is no guarantee that they will receive one. 4728 * 4729 * @param hint A hint about whether or not this view is displayed: 4730 * {@link #VISIBLE} or {@link #INVISIBLE}. 4731 */ 4732 protected void onDisplayHint(int hint) { 4733 } 4734 4735 /** 4736 * Dispatch a window visibility change down the view hierarchy. 4737 * ViewGroups should override to route to their children. 4738 * 4739 * @param visibility The new visibility of the window. 4740 * 4741 * @see #onWindowVisibilityChanged 4742 */ 4743 public void dispatchWindowVisibilityChanged(int visibility) { 4744 onWindowVisibilityChanged(visibility); 4745 } 4746 4747 /** 4748 * Called when the window containing has change its visibility 4749 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 4750 * that this tells you whether or not your window is being made visible 4751 * to the window manager; this does <em>not</em> tell you whether or not 4752 * your window is obscured by other windows on the screen, even if it 4753 * is itself visible. 4754 * 4755 * @param visibility The new visibility of the window. 4756 */ 4757 protected void onWindowVisibilityChanged(int visibility) { 4758 if (visibility == VISIBLE) { 4759 initialAwakenScrollBars(); 4760 } 4761 } 4762 4763 /** 4764 * Returns the current visibility of the window this view is attached to 4765 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 4766 * 4767 * @return Returns the current visibility of the view's window. 4768 */ 4769 public int getWindowVisibility() { 4770 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 4771 } 4772 4773 /** 4774 * Retrieve the overall visible display size in which the window this view is 4775 * attached to has been positioned in. This takes into account screen 4776 * decorations above the window, for both cases where the window itself 4777 * is being position inside of them or the window is being placed under 4778 * then and covered insets are used for the window to position its content 4779 * inside. In effect, this tells you the available area where content can 4780 * be placed and remain visible to users. 4781 * 4782 * <p>This function requires an IPC back to the window manager to retrieve 4783 * the requested information, so should not be used in performance critical 4784 * code like drawing. 4785 * 4786 * @param outRect Filled in with the visible display frame. If the view 4787 * is not attached to a window, this is simply the raw display size. 4788 */ 4789 public void getWindowVisibleDisplayFrame(Rect outRect) { 4790 if (mAttachInfo != null) { 4791 try { 4792 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 4793 } catch (RemoteException e) { 4794 return; 4795 } 4796 // XXX This is really broken, and probably all needs to be done 4797 // in the window manager, and we need to know more about whether 4798 // we want the area behind or in front of the IME. 4799 final Rect insets = mAttachInfo.mVisibleInsets; 4800 outRect.left += insets.left; 4801 outRect.top += insets.top; 4802 outRect.right -= insets.right; 4803 outRect.bottom -= insets.bottom; 4804 return; 4805 } 4806 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 4807 outRect.set(0, 0, d.getWidth(), d.getHeight()); 4808 } 4809 4810 /** 4811 * Dispatch a notification about a resource configuration change down 4812 * the view hierarchy. 4813 * ViewGroups should override to route to their children. 4814 * 4815 * @param newConfig The new resource configuration. 4816 * 4817 * @see #onConfigurationChanged 4818 */ 4819 public void dispatchConfigurationChanged(Configuration newConfig) { 4820 onConfigurationChanged(newConfig); 4821 } 4822 4823 /** 4824 * Called when the current configuration of the resources being used 4825 * by the application have changed. You can use this to decide when 4826 * to reload resources that can changed based on orientation and other 4827 * configuration characterstics. You only need to use this if you are 4828 * not relying on the normal {@link android.app.Activity} mechanism of 4829 * recreating the activity instance upon a configuration change. 4830 * 4831 * @param newConfig The new resource configuration. 4832 */ 4833 protected void onConfigurationChanged(Configuration newConfig) { 4834 } 4835 4836 /** 4837 * Private function to aggregate all per-view attributes in to the view 4838 * root. 4839 */ 4840 void dispatchCollectViewAttributes(int visibility) { 4841 performCollectViewAttributes(visibility); 4842 } 4843 4844 void performCollectViewAttributes(int visibility) { 4845 if ((visibility & VISIBILITY_MASK) == VISIBLE && mAttachInfo != null) { 4846 if ((mViewFlags & KEEP_SCREEN_ON) == KEEP_SCREEN_ON) { 4847 mAttachInfo.mKeepScreenOn = true; 4848 } 4849 mAttachInfo.mSystemUiVisibility |= mSystemUiVisibility; 4850 if (mOnSystemUiVisibilityChangeListener != null) { 4851 mAttachInfo.mHasSystemUiListeners = true; 4852 } 4853 } 4854 } 4855 4856 void needGlobalAttributesUpdate(boolean force) { 4857 final AttachInfo ai = mAttachInfo; 4858 if (ai != null) { 4859 if (force || ai.mKeepScreenOn || (ai.mSystemUiVisibility != 0) 4860 || ai.mHasSystemUiListeners) { 4861 ai.mRecomputeGlobalAttributes = true; 4862 } 4863 } 4864 } 4865 4866 /** 4867 * Returns whether the device is currently in touch mode. Touch mode is entered 4868 * once the user begins interacting with the device by touch, and affects various 4869 * things like whether focus is always visible to the user. 4870 * 4871 * @return Whether the device is in touch mode. 4872 */ 4873 @ViewDebug.ExportedProperty 4874 public boolean isInTouchMode() { 4875 if (mAttachInfo != null) { 4876 return mAttachInfo.mInTouchMode; 4877 } else { 4878 return ViewRoot.isInTouchMode(); 4879 } 4880 } 4881 4882 /** 4883 * Returns the context the view is running in, through which it can 4884 * access the current theme, resources, etc. 4885 * 4886 * @return The view's Context. 4887 */ 4888 @ViewDebug.CapturedViewProperty 4889 public final Context getContext() { 4890 return mContext; 4891 } 4892 4893 /** 4894 * Handle a key event before it is processed by any input method 4895 * associated with the view hierarchy. This can be used to intercept 4896 * key events in special situations before the IME consumes them; a 4897 * typical example would be handling the BACK key to update the application's 4898 * UI instead of allowing the IME to see it and close itself. 4899 * 4900 * @param keyCode The value in event.getKeyCode(). 4901 * @param event Description of the key event. 4902 * @return If you handled the event, return true. If you want to allow the 4903 * event to be handled by the next receiver, return false. 4904 */ 4905 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 4906 return false; 4907 } 4908 4909 /** 4910 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 4911 * KeyEvent.Callback.onKeyDown()}: perform press of the view 4912 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 4913 * is released, if the view is enabled and clickable. 4914 * 4915 * @param keyCode A key code that represents the button pressed, from 4916 * {@link android.view.KeyEvent}. 4917 * @param event The KeyEvent object that defines the button action. 4918 */ 4919 public boolean onKeyDown(int keyCode, KeyEvent event) { 4920 boolean result = false; 4921 4922 switch (keyCode) { 4923 case KeyEvent.KEYCODE_DPAD_CENTER: 4924 case KeyEvent.KEYCODE_ENTER: { 4925 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4926 return true; 4927 } 4928 // Long clickable items don't necessarily have to be clickable 4929 if (((mViewFlags & CLICKABLE) == CLICKABLE || 4930 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 4931 (event.getRepeatCount() == 0)) { 4932 setPressed(true); 4933 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 4934 postCheckForLongClick(0); 4935 } 4936 return true; 4937 } 4938 break; 4939 } 4940 } 4941 return result; 4942 } 4943 4944 /** 4945 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 4946 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 4947 * the event). 4948 */ 4949 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 4950 return false; 4951 } 4952 4953 /** 4954 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 4955 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 4956 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 4957 * {@link KeyEvent#KEYCODE_ENTER} is released. 4958 * 4959 * @param keyCode A key code that represents the button pressed, from 4960 * {@link android.view.KeyEvent}. 4961 * @param event The KeyEvent object that defines the button action. 4962 */ 4963 public boolean onKeyUp(int keyCode, KeyEvent event) { 4964 boolean result = false; 4965 4966 switch (keyCode) { 4967 case KeyEvent.KEYCODE_DPAD_CENTER: 4968 case KeyEvent.KEYCODE_ENTER: { 4969 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4970 return true; 4971 } 4972 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 4973 setPressed(false); 4974 4975 if (!mHasPerformedLongPress) { 4976 // This is a tap, so remove the longpress check 4977 removeLongPressCallback(); 4978 4979 result = performClick(); 4980 } 4981 } 4982 break; 4983 } 4984 } 4985 return result; 4986 } 4987 4988 /** 4989 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 4990 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 4991 * the event). 4992 * 4993 * @param keyCode A key code that represents the button pressed, from 4994 * {@link android.view.KeyEvent}. 4995 * @param repeatCount The number of times the action was made. 4996 * @param event The KeyEvent object that defines the button action. 4997 */ 4998 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 4999 return false; 5000 } 5001 5002 /** 5003 * Called on the focused view when a key shortcut event is not handled. 5004 * Override this method to implement local key shortcuts for the View. 5005 * Key shortcuts can also be implemented by setting the 5006 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 5007 * 5008 * @param keyCode The value in event.getKeyCode(). 5009 * @param event Description of the key event. 5010 * @return If you handled the event, return true. If you want to allow the 5011 * event to be handled by the next receiver, return false. 5012 */ 5013 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 5014 return false; 5015 } 5016 5017 /** 5018 * Check whether the called view is a text editor, in which case it 5019 * would make sense to automatically display a soft input window for 5020 * it. Subclasses should override this if they implement 5021 * {@link #onCreateInputConnection(EditorInfo)} to return true if 5022 * a call on that method would return a non-null InputConnection, and 5023 * they are really a first-class editor that the user would normally 5024 * start typing on when the go into a window containing your view. 5025 * 5026 * <p>The default implementation always returns false. This does 5027 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 5028 * will not be called or the user can not otherwise perform edits on your 5029 * view; it is just a hint to the system that this is not the primary 5030 * purpose of this view. 5031 * 5032 * @return Returns true if this view is a text editor, else false. 5033 */ 5034 public boolean onCheckIsTextEditor() { 5035 return false; 5036 } 5037 5038 /** 5039 * Create a new InputConnection for an InputMethod to interact 5040 * with the view. The default implementation returns null, since it doesn't 5041 * support input methods. You can override this to implement such support. 5042 * This is only needed for views that take focus and text input. 5043 * 5044 * <p>When implementing this, you probably also want to implement 5045 * {@link #onCheckIsTextEditor()} to indicate you will return a 5046 * non-null InputConnection. 5047 * 5048 * @param outAttrs Fill in with attribute information about the connection. 5049 */ 5050 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 5051 return null; 5052 } 5053 5054 /** 5055 * Called by the {@link android.view.inputmethod.InputMethodManager} 5056 * when a view who is not the current 5057 * input connection target is trying to make a call on the manager. The 5058 * default implementation returns false; you can override this to return 5059 * true for certain views if you are performing InputConnection proxying 5060 * to them. 5061 * @param view The View that is making the InputMethodManager call. 5062 * @return Return true to allow the call, false to reject. 5063 */ 5064 public boolean checkInputConnectionProxy(View view) { 5065 return false; 5066 } 5067 5068 /** 5069 * Show the context menu for this view. It is not safe to hold on to the 5070 * menu after returning from this method. 5071 * 5072 * You should normally not overload this method. Overload 5073 * {@link #onCreateContextMenu(ContextMenu)} or define an 5074 * {@link OnCreateContextMenuListener} to add items to the context menu. 5075 * 5076 * @param menu The context menu to populate 5077 */ 5078 public void createContextMenu(ContextMenu menu) { 5079 ContextMenuInfo menuInfo = getContextMenuInfo(); 5080 5081 // Sets the current menu info so all items added to menu will have 5082 // my extra info set. 5083 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 5084 5085 onCreateContextMenu(menu); 5086 if (mOnCreateContextMenuListener != null) { 5087 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 5088 } 5089 5090 // Clear the extra information so subsequent items that aren't mine don't 5091 // have my extra info. 5092 ((MenuBuilder)menu).setCurrentMenuInfo(null); 5093 5094 if (mParent != null) { 5095 mParent.createContextMenu(menu); 5096 } 5097 } 5098 5099 /** 5100 * Views should implement this if they have extra information to associate 5101 * with the context menu. The return result is supplied as a parameter to 5102 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 5103 * callback. 5104 * 5105 * @return Extra information about the item for which the context menu 5106 * should be shown. This information will vary across different 5107 * subclasses of View. 5108 */ 5109 protected ContextMenuInfo getContextMenuInfo() { 5110 return null; 5111 } 5112 5113 /** 5114 * Views should implement this if the view itself is going to add items to 5115 * the context menu. 5116 * 5117 * @param menu the context menu to populate 5118 */ 5119 protected void onCreateContextMenu(ContextMenu menu) { 5120 } 5121 5122 /** 5123 * Implement this method to handle trackball motion events. The 5124 * <em>relative</em> movement of the trackball since the last event 5125 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 5126 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 5127 * that a movement of 1 corresponds to the user pressing one DPAD key (so 5128 * they will often be fractional values, representing the more fine-grained 5129 * movement information available from a trackball). 5130 * 5131 * @param event The motion event. 5132 * @return True if the event was handled, false otherwise. 5133 */ 5134 public boolean onTrackballEvent(MotionEvent event) { 5135 return false; 5136 } 5137 5138 /** 5139 * Implement this method to handle touch screen motion events. 5140 * 5141 * @param event The motion event. 5142 * @return True if the event was handled, false otherwise. 5143 */ 5144 public boolean onTouchEvent(MotionEvent event) { 5145 final int viewFlags = mViewFlags; 5146 5147 if ((viewFlags & ENABLED_MASK) == DISABLED) { 5148 // A disabled view that is clickable still consumes the touch 5149 // events, it just doesn't respond to them. 5150 return (((viewFlags & CLICKABLE) == CLICKABLE || 5151 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 5152 } 5153 5154 if (mTouchDelegate != null) { 5155 if (mTouchDelegate.onTouchEvent(event)) { 5156 return true; 5157 } 5158 } 5159 5160 if (((viewFlags & CLICKABLE) == CLICKABLE || 5161 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 5162 switch (event.getAction()) { 5163 case MotionEvent.ACTION_UP: 5164 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 5165 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 5166 // take focus if we don't have it already and we should in 5167 // touch mode. 5168 boolean focusTaken = false; 5169 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 5170 focusTaken = requestFocus(); 5171 } 5172 5173 if (prepressed) { 5174 // The button is being released before we actually 5175 // showed it as pressed. Make it show the pressed 5176 // state now (before scheduling the click) to ensure 5177 // the user sees it. 5178 mPrivateFlags |= PRESSED; 5179 refreshDrawableState(); 5180 } 5181 5182 if (!mHasPerformedLongPress) { 5183 // This is a tap, so remove the longpress check 5184 removeLongPressCallback(); 5185 5186 // Only perform take click actions if we were in the pressed state 5187 if (!focusTaken) { 5188 // Use a Runnable and post this rather than calling 5189 // performClick directly. This lets other visual state 5190 // of the view update before click actions start. 5191 if (mPerformClick == null) { 5192 mPerformClick = new PerformClick(); 5193 } 5194 if (!post(mPerformClick)) { 5195 performClick(); 5196 } 5197 } 5198 } 5199 5200 if (mUnsetPressedState == null) { 5201 mUnsetPressedState = new UnsetPressedState(); 5202 } 5203 5204 if (prepressed) { 5205 postDelayed(mUnsetPressedState, 5206 ViewConfiguration.getPressedStateDuration()); 5207 } else if (!post(mUnsetPressedState)) { 5208 // If the post failed, unpress right now 5209 mUnsetPressedState.run(); 5210 } 5211 removeTapCallback(); 5212 } 5213 break; 5214 5215 case MotionEvent.ACTION_DOWN: 5216 if (mPendingCheckForTap == null) { 5217 mPendingCheckForTap = new CheckForTap(); 5218 } 5219 mPrivateFlags |= PREPRESSED; 5220 mHasPerformedLongPress = false; 5221 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 5222 break; 5223 5224 case MotionEvent.ACTION_CANCEL: 5225 mPrivateFlags &= ~PRESSED; 5226 refreshDrawableState(); 5227 removeTapCallback(); 5228 break; 5229 5230 case MotionEvent.ACTION_MOVE: 5231 final int x = (int) event.getX(); 5232 final int y = (int) event.getY(); 5233 5234 // Be lenient about moving outside of buttons 5235 if (!pointInView(x, y, mTouchSlop)) { 5236 // Outside button 5237 removeTapCallback(); 5238 if ((mPrivateFlags & PRESSED) != 0) { 5239 // Remove any future long press/tap checks 5240 removeLongPressCallback(); 5241 5242 // Need to switch from pressed to not pressed 5243 mPrivateFlags &= ~PRESSED; 5244 refreshDrawableState(); 5245 } 5246 } 5247 break; 5248 } 5249 return true; 5250 } 5251 5252 return false; 5253 } 5254 5255 /** 5256 * Remove the longpress detection timer. 5257 */ 5258 private void removeLongPressCallback() { 5259 if (mPendingCheckForLongPress != null) { 5260 removeCallbacks(mPendingCheckForLongPress); 5261 } 5262 } 5263 5264 /** 5265 * Remove the pending click action 5266 */ 5267 private void removePerformClickCallback() { 5268 if (mPerformClick != null) { 5269 removeCallbacks(mPerformClick); 5270 } 5271 } 5272 5273 /** 5274 * Remove the prepress detection timer. 5275 */ 5276 private void removeUnsetPressCallback() { 5277 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 5278 setPressed(false); 5279 removeCallbacks(mUnsetPressedState); 5280 } 5281 } 5282 5283 /** 5284 * Remove the tap detection timer. 5285 */ 5286 private void removeTapCallback() { 5287 if (mPendingCheckForTap != null) { 5288 mPrivateFlags &= ~PREPRESSED; 5289 removeCallbacks(mPendingCheckForTap); 5290 } 5291 } 5292 5293 /** 5294 * Cancels a pending long press. Your subclass can use this if you 5295 * want the context menu to come up if the user presses and holds 5296 * at the same place, but you don't want it to come up if they press 5297 * and then move around enough to cause scrolling. 5298 */ 5299 public void cancelLongPress() { 5300 removeLongPressCallback(); 5301 5302 /* 5303 * The prepressed state handled by the tap callback is a display 5304 * construct, but the tap callback will post a long press callback 5305 * less its own timeout. Remove it here. 5306 */ 5307 removeTapCallback(); 5308 } 5309 5310 /** 5311 * Sets the TouchDelegate for this View. 5312 */ 5313 public void setTouchDelegate(TouchDelegate delegate) { 5314 mTouchDelegate = delegate; 5315 } 5316 5317 /** 5318 * Gets the TouchDelegate for this View. 5319 */ 5320 public TouchDelegate getTouchDelegate() { 5321 return mTouchDelegate; 5322 } 5323 5324 /** 5325 * Set flags controlling behavior of this view. 5326 * 5327 * @param flags Constant indicating the value which should be set 5328 * @param mask Constant indicating the bit range that should be changed 5329 */ 5330 void setFlags(int flags, int mask) { 5331 int old = mViewFlags; 5332 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 5333 5334 int changed = mViewFlags ^ old; 5335 if (changed == 0) { 5336 return; 5337 } 5338 int privateFlags = mPrivateFlags; 5339 5340 /* Check if the FOCUSABLE bit has changed */ 5341 if (((changed & FOCUSABLE_MASK) != 0) && 5342 ((privateFlags & HAS_BOUNDS) !=0)) { 5343 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 5344 && ((privateFlags & FOCUSED) != 0)) { 5345 /* Give up focus if we are no longer focusable */ 5346 clearFocus(); 5347 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 5348 && ((privateFlags & FOCUSED) == 0)) { 5349 /* 5350 * Tell the view system that we are now available to take focus 5351 * if no one else already has it. 5352 */ 5353 if (mParent != null) mParent.focusableViewAvailable(this); 5354 } 5355 } 5356 5357 if ((flags & VISIBILITY_MASK) == VISIBLE) { 5358 if ((changed & VISIBILITY_MASK) != 0) { 5359 /* 5360 * If this view is becoming visible, set the DRAWN flag so that 5361 * the next invalidate() will not be skipped. 5362 */ 5363 mPrivateFlags |= DRAWN; 5364 5365 needGlobalAttributesUpdate(true); 5366 5367 // a view becoming visible is worth notifying the parent 5368 // about in case nothing has focus. even if this specific view 5369 // isn't focusable, it may contain something that is, so let 5370 // the root view try to give this focus if nothing else does. 5371 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 5372 mParent.focusableViewAvailable(this); 5373 } 5374 } 5375 } 5376 5377 /* Check if the GONE bit has changed */ 5378 if ((changed & GONE) != 0) { 5379 needGlobalAttributesUpdate(false); 5380 requestLayout(); 5381 invalidate(true); 5382 5383 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 5384 if (hasFocus()) clearFocus(); 5385 destroyDrawingCache(); 5386 } 5387 if (mAttachInfo != null) { 5388 mAttachInfo.mViewVisibilityChanged = true; 5389 } 5390 } 5391 5392 /* Check if the VISIBLE bit has changed */ 5393 if ((changed & INVISIBLE) != 0) { 5394 needGlobalAttributesUpdate(false); 5395 invalidate(true); 5396 5397 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 5398 // root view becoming invisible shouldn't clear focus 5399 if (getRootView() != this) { 5400 clearFocus(); 5401 } 5402 } 5403 if (mAttachInfo != null) { 5404 mAttachInfo.mViewVisibilityChanged = true; 5405 } 5406 } 5407 5408 if ((changed & VISIBILITY_MASK) != 0) { 5409 if (mParent instanceof ViewGroup) { 5410 ((ViewGroup) mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5411 ((View) mParent).invalidate(true); 5412 } 5413 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5414 } 5415 5416 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 5417 destroyDrawingCache(); 5418 } 5419 5420 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 5421 destroyDrawingCache(); 5422 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5423 invalidateParentCaches(); 5424 } 5425 5426 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 5427 destroyDrawingCache(); 5428 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5429 } 5430 5431 if ((changed & DRAW_MASK) != 0) { 5432 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 5433 if (mBGDrawable != null) { 5434 mPrivateFlags &= ~SKIP_DRAW; 5435 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 5436 } else { 5437 mPrivateFlags |= SKIP_DRAW; 5438 } 5439 } else { 5440 mPrivateFlags &= ~SKIP_DRAW; 5441 } 5442 requestLayout(); 5443 invalidate(true); 5444 } 5445 5446 if ((changed & KEEP_SCREEN_ON) != 0) { 5447 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 5448 mParent.recomputeViewAttributes(this); 5449 } 5450 } 5451 } 5452 5453 /** 5454 * Change the view's z order in the tree, so it's on top of other sibling 5455 * views 5456 */ 5457 public void bringToFront() { 5458 if (mParent != null) { 5459 mParent.bringChildToFront(this); 5460 } 5461 } 5462 5463 /** 5464 * This is called in response to an internal scroll in this view (i.e., the 5465 * view scrolled its own contents). This is typically as a result of 5466 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 5467 * called. 5468 * 5469 * @param l Current horizontal scroll origin. 5470 * @param t Current vertical scroll origin. 5471 * @param oldl Previous horizontal scroll origin. 5472 * @param oldt Previous vertical scroll origin. 5473 */ 5474 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 5475 mBackgroundSizeChanged = true; 5476 5477 final AttachInfo ai = mAttachInfo; 5478 if (ai != null) { 5479 ai.mViewScrollChanged = true; 5480 } 5481 } 5482 5483 /** 5484 * Interface definition for a callback to be invoked when the layout bounds of a view 5485 * changes due to layout processing. 5486 */ 5487 public interface OnLayoutChangeListener { 5488 /** 5489 * Called when the focus state of a view has changed. 5490 * 5491 * @param v The view whose state has changed. 5492 * @param left The new value of the view's left property. 5493 * @param top The new value of the view's top property. 5494 * @param right The new value of the view's right property. 5495 * @param bottom The new value of the view's bottom property. 5496 * @param oldLeft The previous value of the view's left property. 5497 * @param oldTop The previous value of the view's top property. 5498 * @param oldRight The previous value of the view's right property. 5499 * @param oldBottom The previous value of the view's bottom property. 5500 */ 5501 void onLayoutChange(View v, int left, int top, int right, int bottom, 5502 int oldLeft, int oldTop, int oldRight, int oldBottom); 5503 } 5504 5505 /** 5506 * This is called during layout when the size of this view has changed. If 5507 * you were just added to the view hierarchy, you're called with the old 5508 * values of 0. 5509 * 5510 * @param w Current width of this view. 5511 * @param h Current height of this view. 5512 * @param oldw Old width of this view. 5513 * @param oldh Old height of this view. 5514 */ 5515 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 5516 } 5517 5518 /** 5519 * Called by draw to draw the child views. This may be overridden 5520 * by derived classes to gain control just before its children are drawn 5521 * (but after its own view has been drawn). 5522 * @param canvas the canvas on which to draw the view 5523 */ 5524 protected void dispatchDraw(Canvas canvas) { 5525 } 5526 5527 /** 5528 * Gets the parent of this view. Note that the parent is a 5529 * ViewParent and not necessarily a View. 5530 * 5531 * @return Parent of this view. 5532 */ 5533 public final ViewParent getParent() { 5534 return mParent; 5535 } 5536 5537 /** 5538 * Return the scrolled left position of this view. This is the left edge of 5539 * the displayed part of your view. You do not need to draw any pixels 5540 * farther left, since those are outside of the frame of your view on 5541 * screen. 5542 * 5543 * @return The left edge of the displayed part of your view, in pixels. 5544 */ 5545 public final int getScrollX() { 5546 return mScrollX; 5547 } 5548 5549 /** 5550 * Return the scrolled top position of this view. This is the top edge of 5551 * the displayed part of your view. You do not need to draw any pixels above 5552 * it, since those are outside of the frame of your view on screen. 5553 * 5554 * @return The top edge of the displayed part of your view, in pixels. 5555 */ 5556 public final int getScrollY() { 5557 return mScrollY; 5558 } 5559 5560 /** 5561 * Return the width of the your view. 5562 * 5563 * @return The width of your view, in pixels. 5564 */ 5565 @ViewDebug.ExportedProperty(category = "layout") 5566 public final int getWidth() { 5567 return mRight - mLeft; 5568 } 5569 5570 /** 5571 * Return the height of your view. 5572 * 5573 * @return The height of your view, in pixels. 5574 */ 5575 @ViewDebug.ExportedProperty(category = "layout") 5576 public final int getHeight() { 5577 return mBottom - mTop; 5578 } 5579 5580 /** 5581 * Return the visible drawing bounds of your view. Fills in the output 5582 * rectangle with the values from getScrollX(), getScrollY(), 5583 * getWidth(), and getHeight(). 5584 * 5585 * @param outRect The (scrolled) drawing bounds of the view. 5586 */ 5587 public void getDrawingRect(Rect outRect) { 5588 outRect.left = mScrollX; 5589 outRect.top = mScrollY; 5590 outRect.right = mScrollX + (mRight - mLeft); 5591 outRect.bottom = mScrollY + (mBottom - mTop); 5592 } 5593 5594 /** 5595 * Like {@link #getMeasuredWidthAndState()}, but only returns the 5596 * raw width component (that is the result is masked by 5597 * {@link #MEASURED_SIZE_MASK}). 5598 * 5599 * @return The raw measured width of this view. 5600 */ 5601 public final int getMeasuredWidth() { 5602 return mMeasuredWidth & MEASURED_SIZE_MASK; 5603 } 5604 5605 /** 5606 * Return the full width measurement information for this view as computed 5607 * by the most recent call to {@link #measure}. This result is a bit mask 5608 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5609 * This should be used during measurement and layout calculations only. Use 5610 * {@link #getWidth()} to see how wide a view is after layout. 5611 * 5612 * @return The measured width of this view as a bit mask. 5613 */ 5614 public final int getMeasuredWidthAndState() { 5615 return mMeasuredWidth; 5616 } 5617 5618 /** 5619 * Like {@link #getMeasuredHeightAndState()}, but only returns the 5620 * raw width component (that is the result is masked by 5621 * {@link #MEASURED_SIZE_MASK}). 5622 * 5623 * @return The raw measured height of this view. 5624 */ 5625 public final int getMeasuredHeight() { 5626 return mMeasuredHeight & MEASURED_SIZE_MASK; 5627 } 5628 5629 /** 5630 * Return the full height measurement information for this view as computed 5631 * by the most recent call to {@link #measure}. This result is a bit mask 5632 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5633 * This should be used during measurement and layout calculations only. Use 5634 * {@link #getHeight()} to see how wide a view is after layout. 5635 * 5636 * @return The measured width of this view as a bit mask. 5637 */ 5638 public final int getMeasuredHeightAndState() { 5639 return mMeasuredHeight; 5640 } 5641 5642 /** 5643 * Return only the state bits of {@link #getMeasuredWidthAndState()} 5644 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 5645 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 5646 * and the height component is at the shifted bits 5647 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 5648 */ 5649 public final int getMeasuredState() { 5650 return (mMeasuredWidth&MEASURED_STATE_MASK) 5651 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 5652 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 5653 } 5654 5655 /** 5656 * The transform matrix of this view, which is calculated based on the current 5657 * roation, scale, and pivot properties. 5658 * 5659 * @see #getRotation() 5660 * @see #getScaleX() 5661 * @see #getScaleY() 5662 * @see #getPivotX() 5663 * @see #getPivotY() 5664 * @return The current transform matrix for the view 5665 */ 5666 public Matrix getMatrix() { 5667 updateMatrix(); 5668 return mMatrix; 5669 } 5670 5671 /** 5672 * Utility function to determine if the value is far enough away from zero to be 5673 * considered non-zero. 5674 * @param value A floating point value to check for zero-ness 5675 * @return whether the passed-in value is far enough away from zero to be considered non-zero 5676 */ 5677 private static boolean nonzero(float value) { 5678 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 5679 } 5680 5681 /** 5682 * Returns true if the transform matrix is the identity matrix. 5683 * Recomputes the matrix if necessary. 5684 * 5685 * @return True if the transform matrix is the identity matrix, false otherwise. 5686 */ 5687 final boolean hasIdentityMatrix() { 5688 updateMatrix(); 5689 return mMatrixIsIdentity; 5690 } 5691 5692 /** 5693 * Recomputes the transform matrix if necessary. 5694 */ 5695 private void updateMatrix() { 5696 if (mMatrixDirty) { 5697 // transform-related properties have changed since the last time someone 5698 // asked for the matrix; recalculate it with the current values 5699 5700 // Figure out if we need to update the pivot point 5701 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5702 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 5703 mPrevWidth = mRight - mLeft; 5704 mPrevHeight = mBottom - mTop; 5705 mPivotX = mPrevWidth / 2f; 5706 mPivotY = mPrevHeight / 2f; 5707 } 5708 } 5709 mMatrix.reset(); 5710 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 5711 mMatrix.setTranslate(mTranslationX, mTranslationY); 5712 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 5713 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5714 } else { 5715 if (mCamera == null) { 5716 mCamera = new Camera(); 5717 matrix3D = new Matrix(); 5718 } 5719 mCamera.save(); 5720 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5721 mCamera.rotateX(mRotationX); 5722 mCamera.rotateY(mRotationY); 5723 mCamera.rotateZ(-mRotation); 5724 mCamera.getMatrix(matrix3D); 5725 matrix3D.preTranslate(-mPivotX, -mPivotY); 5726 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 5727 mMatrix.postConcat(matrix3D); 5728 mCamera.restore(); 5729 } 5730 mMatrixDirty = false; 5731 mMatrixIsIdentity = mMatrix.isIdentity(); 5732 mInverseMatrixDirty = true; 5733 } 5734 } 5735 5736 /** 5737 * Utility method to retrieve the inverse of the current mMatrix property. 5738 * We cache the matrix to avoid recalculating it when transform properties 5739 * have not changed. 5740 * 5741 * @return The inverse of the current matrix of this view. 5742 */ 5743 final Matrix getInverseMatrix() { 5744 updateMatrix(); 5745 if (mInverseMatrixDirty) { 5746 if (mInverseMatrix == null) { 5747 mInverseMatrix = new Matrix(); 5748 } 5749 mMatrix.invert(mInverseMatrix); 5750 mInverseMatrixDirty = false; 5751 } 5752 return mInverseMatrix; 5753 } 5754 5755 /** 5756 * The degrees that the view is rotated around the pivot point. 5757 * 5758 * @see #getPivotX() 5759 * @see #getPivotY() 5760 * @return The degrees of rotation. 5761 */ 5762 public float getRotation() { 5763 return mRotation; 5764 } 5765 5766 /** 5767 * Sets the degrees that the view is rotated around the pivot point. Increasing values 5768 * result in clockwise rotation. 5769 * 5770 * @param rotation The degrees of rotation. 5771 * @see #getPivotX() 5772 * @see #getPivotY() 5773 * 5774 * @attr ref android.R.styleable#View_rotation 5775 */ 5776 public void setRotation(float rotation) { 5777 if (mRotation != rotation) { 5778 invalidateParentCaches(); 5779 // Double-invalidation is necessary to capture view's old and new areas 5780 invalidate(false); 5781 mRotation = rotation; 5782 mMatrixDirty = true; 5783 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5784 invalidate(false); 5785 } 5786 } 5787 5788 /** 5789 * The degrees that the view is rotated around the vertical axis through the pivot point. 5790 * 5791 * @see #getPivotX() 5792 * @see #getPivotY() 5793 * @return The degrees of Y rotation. 5794 */ 5795 public float getRotationY() { 5796 return mRotationY; 5797 } 5798 5799 /** 5800 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 5801 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 5802 * down the y axis. 5803 * 5804 * @param rotationY The degrees of Y rotation. 5805 * @see #getPivotX() 5806 * @see #getPivotY() 5807 * 5808 * @attr ref android.R.styleable#View_rotationY 5809 */ 5810 public void setRotationY(float rotationY) { 5811 if (mRotationY != rotationY) { 5812 invalidateParentCaches(); 5813 // Double-invalidation is necessary to capture view's old and new areas 5814 invalidate(false); 5815 mRotationY = rotationY; 5816 mMatrixDirty = true; 5817 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5818 invalidate(false); 5819 } 5820 } 5821 5822 /** 5823 * The degrees that the view is rotated around the horizontal axis through the pivot point. 5824 * 5825 * @see #getPivotX() 5826 * @see #getPivotY() 5827 * @return The degrees of X rotation. 5828 */ 5829 public float getRotationX() { 5830 return mRotationX; 5831 } 5832 5833 /** 5834 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 5835 * Increasing values result in clockwise rotation from the viewpoint of looking down the 5836 * x axis. 5837 * 5838 * @param rotationX The degrees of X rotation. 5839 * @see #getPivotX() 5840 * @see #getPivotY() 5841 * 5842 * @attr ref android.R.styleable#View_rotationX 5843 */ 5844 public void setRotationX(float rotationX) { 5845 if (mRotationX != rotationX) { 5846 invalidateParentCaches(); 5847 // Double-invalidation is necessary to capture view's old and new areas 5848 invalidate(false); 5849 mRotationX = rotationX; 5850 mMatrixDirty = true; 5851 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5852 invalidate(false); 5853 } 5854 } 5855 5856 /** 5857 * The amount that the view is scaled in x around the pivot point, as a proportion of 5858 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 5859 * 5860 * <p>By default, this is 1.0f. 5861 * 5862 * @see #getPivotX() 5863 * @see #getPivotY() 5864 * @return The scaling factor. 5865 */ 5866 public float getScaleX() { 5867 return mScaleX; 5868 } 5869 5870 /** 5871 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 5872 * the view's unscaled width. A value of 1 means that no scaling is applied. 5873 * 5874 * @param scaleX The scaling factor. 5875 * @see #getPivotX() 5876 * @see #getPivotY() 5877 * 5878 * @attr ref android.R.styleable#View_scaleX 5879 */ 5880 public void setScaleX(float scaleX) { 5881 if (mScaleX != scaleX) { 5882 invalidateParentCaches(); 5883 // Double-invalidation is necessary to capture view's old and new areas 5884 invalidate(false); 5885 mScaleX = scaleX; 5886 mMatrixDirty = true; 5887 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5888 invalidate(false); 5889 } 5890 } 5891 5892 /** 5893 * The amount that the view is scaled in y around the pivot point, as a proportion of 5894 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 5895 * 5896 * <p>By default, this is 1.0f. 5897 * 5898 * @see #getPivotX() 5899 * @see #getPivotY() 5900 * @return The scaling factor. 5901 */ 5902 public float getScaleY() { 5903 return mScaleY; 5904 } 5905 5906 /** 5907 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 5908 * the view's unscaled width. A value of 1 means that no scaling is applied. 5909 * 5910 * @param scaleY The scaling factor. 5911 * @see #getPivotX() 5912 * @see #getPivotY() 5913 * 5914 * @attr ref android.R.styleable#View_scaleY 5915 */ 5916 public void setScaleY(float scaleY) { 5917 if (mScaleY != scaleY) { 5918 invalidateParentCaches(); 5919 // Double-invalidation is necessary to capture view's old and new areas 5920 invalidate(false); 5921 mScaleY = scaleY; 5922 mMatrixDirty = true; 5923 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5924 invalidate(false); 5925 } 5926 } 5927 5928 /** 5929 * The x location of the point around which the view is {@link #setRotation(float) rotated} 5930 * and {@link #setScaleX(float) scaled}. 5931 * 5932 * @see #getRotation() 5933 * @see #getScaleX() 5934 * @see #getScaleY() 5935 * @see #getPivotY() 5936 * @return The x location of the pivot point. 5937 */ 5938 public float getPivotX() { 5939 return mPivotX; 5940 } 5941 5942 /** 5943 * Sets the x location of the point around which the view is 5944 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 5945 * By default, the pivot point is centered on the object. 5946 * Setting this property disables this behavior and causes the view to use only the 5947 * explicitly set pivotX and pivotY values. 5948 * 5949 * @param pivotX The x location of the pivot point. 5950 * @see #getRotation() 5951 * @see #getScaleX() 5952 * @see #getScaleY() 5953 * @see #getPivotY() 5954 * 5955 * @attr ref android.R.styleable#View_transformPivotX 5956 */ 5957 public void setPivotX(float pivotX) { 5958 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5959 if (mPivotX != pivotX) { 5960 invalidateParentCaches(); 5961 // Double-invalidation is necessary to capture view's old and new areas 5962 invalidate(false); 5963 mPivotX = pivotX; 5964 mMatrixDirty = true; 5965 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5966 invalidate(false); 5967 } 5968 } 5969 5970 /** 5971 * The y location of the point around which the view is {@link #setRotation(float) rotated} 5972 * and {@link #setScaleY(float) scaled}. 5973 * 5974 * @see #getRotation() 5975 * @see #getScaleX() 5976 * @see #getScaleY() 5977 * @see #getPivotY() 5978 * @return The y location of the pivot point. 5979 */ 5980 public float getPivotY() { 5981 return mPivotY; 5982 } 5983 5984 /** 5985 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 5986 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 5987 * Setting this property disables this behavior and causes the view to use only the 5988 * explicitly set pivotX and pivotY values. 5989 * 5990 * @param pivotY The y location of the pivot point. 5991 * @see #getRotation() 5992 * @see #getScaleX() 5993 * @see #getScaleY() 5994 * @see #getPivotY() 5995 * 5996 * @attr ref android.R.styleable#View_transformPivotY 5997 */ 5998 public void setPivotY(float pivotY) { 5999 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 6000 if (mPivotY != pivotY) { 6001 invalidateParentCaches(); 6002 // Double-invalidation is necessary to capture view's old and new areas 6003 invalidate(false); 6004 mPivotY = pivotY; 6005 mMatrixDirty = true; 6006 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6007 invalidate(false); 6008 } 6009 } 6010 6011 /** 6012 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 6013 * completely transparent and 1 means the view is completely opaque. 6014 * 6015 * <p>By default this is 1.0f. 6016 * @return The opacity of the view. 6017 */ 6018 public float getAlpha() { 6019 return mAlpha; 6020 } 6021 6022 /** 6023 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 6024 * completely transparent and 1 means the view is completely opaque.</p> 6025 * 6026 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 6027 * responsible for applying the opacity itself. Otherwise, calling this method is 6028 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 6029 * setting a hardware layer.</p> 6030 * 6031 * @param alpha The opacity of the view. 6032 * 6033 * @see #setLayerType(int, android.graphics.Paint) 6034 * 6035 * @attr ref android.R.styleable#View_alpha 6036 */ 6037 public void setAlpha(float alpha) { 6038 mAlpha = alpha; 6039 invalidateParentCaches(); 6040 if (onSetAlpha((int) (alpha * 255))) { 6041 mPrivateFlags |= ALPHA_SET; 6042 // subclass is handling alpha - don't optimize rendering cache invalidation 6043 invalidate(true); 6044 } else { 6045 mPrivateFlags &= ~ALPHA_SET; 6046 invalidate(false); 6047 } 6048 } 6049 6050 /** 6051 * Top position of this view relative to its parent. 6052 * 6053 * @return The top of this view, in pixels. 6054 */ 6055 @ViewDebug.CapturedViewProperty 6056 public final int getTop() { 6057 return mTop; 6058 } 6059 6060 /** 6061 * Sets the top position of this view relative to its parent. This method is meant to be called 6062 * by the layout system and should not generally be called otherwise, because the property 6063 * may be changed at any time by the layout. 6064 * 6065 * @param top The top of this view, in pixels. 6066 */ 6067 public final void setTop(int top) { 6068 if (top != mTop) { 6069 updateMatrix(); 6070 if (mMatrixIsIdentity) { 6071 final ViewParent p = mParent; 6072 if (p != null && mAttachInfo != null) { 6073 final Rect r = mAttachInfo.mTmpInvalRect; 6074 int minTop; 6075 int yLoc; 6076 if (top < mTop) { 6077 minTop = top; 6078 yLoc = top - mTop; 6079 } else { 6080 minTop = mTop; 6081 yLoc = 0; 6082 } 6083 r.set(0, yLoc, mRight - mLeft, mBottom - minTop); 6084 p.invalidateChild(this, r); 6085 } 6086 } else { 6087 // Double-invalidation is necessary to capture view's old and new areas 6088 invalidate(true); 6089 } 6090 6091 int width = mRight - mLeft; 6092 int oldHeight = mBottom - mTop; 6093 6094 mTop = top; 6095 6096 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6097 6098 if (!mMatrixIsIdentity) { 6099 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6100 // A change in dimension means an auto-centered pivot point changes, too 6101 mMatrixDirty = true; 6102 } 6103 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6104 invalidate(true); 6105 } 6106 mBackgroundSizeChanged = true; 6107 invalidateParentIfNeeded(); 6108 } 6109 } 6110 6111 /** 6112 * Bottom position of this view relative to its parent. 6113 * 6114 * @return The bottom of this view, in pixels. 6115 */ 6116 @ViewDebug.CapturedViewProperty 6117 public final int getBottom() { 6118 return mBottom; 6119 } 6120 6121 /** 6122 * True if this view has changed since the last time being drawn. 6123 * 6124 * @return The dirty state of this view. 6125 */ 6126 public boolean isDirty() { 6127 return (mPrivateFlags & DIRTY_MASK) != 0; 6128 } 6129 6130 /** 6131 * Sets the bottom position of this view relative to its parent. This method is meant to be 6132 * called by the layout system and should not generally be called otherwise, because the 6133 * property may be changed at any time by the layout. 6134 * 6135 * @param bottom The bottom of this view, in pixels. 6136 */ 6137 public final void setBottom(int bottom) { 6138 if (bottom != mBottom) { 6139 updateMatrix(); 6140 if (mMatrixIsIdentity) { 6141 final ViewParent p = mParent; 6142 if (p != null && mAttachInfo != null) { 6143 final Rect r = mAttachInfo.mTmpInvalRect; 6144 int maxBottom; 6145 if (bottom < mBottom) { 6146 maxBottom = mBottom; 6147 } else { 6148 maxBottom = bottom; 6149 } 6150 r.set(0, 0, mRight - mLeft, maxBottom - mTop); 6151 p.invalidateChild(this, r); 6152 } 6153 } else { 6154 // Double-invalidation is necessary to capture view's old and new areas 6155 invalidate(true); 6156 } 6157 6158 int width = mRight - mLeft; 6159 int oldHeight = mBottom - mTop; 6160 6161 mBottom = bottom; 6162 6163 onSizeChanged(width, mBottom - mTop, width, oldHeight); 6164 6165 if (!mMatrixIsIdentity) { 6166 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6167 // A change in dimension means an auto-centered pivot point changes, too 6168 mMatrixDirty = true; 6169 } 6170 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6171 invalidate(true); 6172 } 6173 mBackgroundSizeChanged = true; 6174 invalidateParentIfNeeded(); 6175 } 6176 } 6177 6178 /** 6179 * Left position of this view relative to its parent. 6180 * 6181 * @return The left edge of this view, in pixels. 6182 */ 6183 @ViewDebug.CapturedViewProperty 6184 public final int getLeft() { 6185 return mLeft; 6186 } 6187 6188 /** 6189 * Sets the left position of this view relative to its parent. This method is meant to be called 6190 * by the layout system and should not generally be called otherwise, because the property 6191 * may be changed at any time by the layout. 6192 * 6193 * @param left The bottom of this view, in pixels. 6194 */ 6195 public final void setLeft(int left) { 6196 if (left != mLeft) { 6197 updateMatrix(); 6198 if (mMatrixIsIdentity) { 6199 final ViewParent p = mParent; 6200 if (p != null && mAttachInfo != null) { 6201 final Rect r = mAttachInfo.mTmpInvalRect; 6202 int minLeft; 6203 int xLoc; 6204 if (left < mLeft) { 6205 minLeft = left; 6206 xLoc = left - mLeft; 6207 } else { 6208 minLeft = mLeft; 6209 xLoc = 0; 6210 } 6211 r.set(xLoc, 0, mRight - minLeft, mBottom - mTop); 6212 p.invalidateChild(this, r); 6213 } 6214 } else { 6215 // Double-invalidation is necessary to capture view's old and new areas 6216 invalidate(true); 6217 } 6218 6219 int oldWidth = mRight - mLeft; 6220 int height = mBottom - mTop; 6221 6222 mLeft = left; 6223 6224 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6225 6226 if (!mMatrixIsIdentity) { 6227 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6228 // A change in dimension means an auto-centered pivot point changes, too 6229 mMatrixDirty = true; 6230 } 6231 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6232 invalidate(true); 6233 } 6234 mBackgroundSizeChanged = true; 6235 invalidateParentIfNeeded(); 6236 } 6237 } 6238 6239 /** 6240 * Right position of this view relative to its parent. 6241 * 6242 * @return The right edge of this view, in pixels. 6243 */ 6244 @ViewDebug.CapturedViewProperty 6245 public final int getRight() { 6246 return mRight; 6247 } 6248 6249 /** 6250 * Sets the right position of this view relative to its parent. This method is meant to be called 6251 * by the layout system and should not generally be called otherwise, because the property 6252 * may be changed at any time by the layout. 6253 * 6254 * @param right The bottom of this view, in pixels. 6255 */ 6256 public final void setRight(int right) { 6257 if (right != mRight) { 6258 updateMatrix(); 6259 if (mMatrixIsIdentity) { 6260 final ViewParent p = mParent; 6261 if (p != null && mAttachInfo != null) { 6262 final Rect r = mAttachInfo.mTmpInvalRect; 6263 int maxRight; 6264 if (right < mRight) { 6265 maxRight = mRight; 6266 } else { 6267 maxRight = right; 6268 } 6269 r.set(0, 0, maxRight - mLeft, mBottom - mTop); 6270 p.invalidateChild(this, r); 6271 } 6272 } else { 6273 // Double-invalidation is necessary to capture view's old and new areas 6274 invalidate(true); 6275 } 6276 6277 int oldWidth = mRight - mLeft; 6278 int height = mBottom - mTop; 6279 6280 mRight = right; 6281 6282 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6283 6284 if (!mMatrixIsIdentity) { 6285 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6286 // A change in dimension means an auto-centered pivot point changes, too 6287 mMatrixDirty = true; 6288 } 6289 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6290 invalidate(true); 6291 } 6292 mBackgroundSizeChanged = true; 6293 invalidateParentIfNeeded(); 6294 } 6295 } 6296 6297 /** 6298 * The visual x position of this view, in pixels. This is equivalent to the 6299 * {@link #setTranslationX(float) translationX} property plus the current 6300 * {@link #getLeft() left} property. 6301 * 6302 * @return The visual x position of this view, in pixels. 6303 */ 6304 public float getX() { 6305 return mLeft + mTranslationX; 6306 } 6307 6308 /** 6309 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 6310 * {@link #setTranslationX(float) translationX} property to be the difference between 6311 * the x value passed in and the current {@link #getLeft() left} property. 6312 * 6313 * @param x The visual x position of this view, in pixels. 6314 */ 6315 public void setX(float x) { 6316 setTranslationX(x - mLeft); 6317 } 6318 6319 /** 6320 * The visual y position of this view, in pixels. This is equivalent to the 6321 * {@link #setTranslationY(float) translationY} property plus the current 6322 * {@link #getTop() top} property. 6323 * 6324 * @return The visual y position of this view, in pixels. 6325 */ 6326 public float getY() { 6327 return mTop + mTranslationY; 6328 } 6329 6330 /** 6331 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 6332 * {@link #setTranslationY(float) translationY} property to be the difference between 6333 * the y value passed in and the current {@link #getTop() top} property. 6334 * 6335 * @param y The visual y position of this view, in pixels. 6336 */ 6337 public void setY(float y) { 6338 setTranslationY(y - mTop); 6339 } 6340 6341 6342 /** 6343 * The horizontal location of this view relative to its {@link #getLeft() left} position. 6344 * This position is post-layout, in addition to wherever the object's 6345 * layout placed it. 6346 * 6347 * @return The horizontal position of this view relative to its left position, in pixels. 6348 */ 6349 public float getTranslationX() { 6350 return mTranslationX; 6351 } 6352 6353 /** 6354 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 6355 * This effectively positions the object post-layout, in addition to wherever the object's 6356 * layout placed it. 6357 * 6358 * @param translationX The horizontal position of this view relative to its left position, 6359 * in pixels. 6360 * 6361 * @attr ref android.R.styleable#View_translationX 6362 */ 6363 public void setTranslationX(float translationX) { 6364 if (mTranslationX != translationX) { 6365 invalidateParentCaches(); 6366 // Double-invalidation is necessary to capture view's old and new areas 6367 invalidate(false); 6368 mTranslationX = translationX; 6369 mMatrixDirty = true; 6370 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6371 invalidate(false); 6372 } 6373 } 6374 6375 /** 6376 * The horizontal location of this view relative to its {@link #getTop() top} position. 6377 * This position is post-layout, in addition to wherever the object's 6378 * layout placed it. 6379 * 6380 * @return The vertical position of this view relative to its top position, 6381 * in pixels. 6382 */ 6383 public float getTranslationY() { 6384 return mTranslationY; 6385 } 6386 6387 /** 6388 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 6389 * This effectively positions the object post-layout, in addition to wherever the object's 6390 * layout placed it. 6391 * 6392 * @param translationY The vertical position of this view relative to its top position, 6393 * in pixels. 6394 * 6395 * @attr ref android.R.styleable#View_translationY 6396 */ 6397 public void setTranslationY(float translationY) { 6398 if (mTranslationY != translationY) { 6399 invalidateParentCaches(); 6400 // Double-invalidation is necessary to capture view's old and new areas 6401 invalidate(false); 6402 mTranslationY = translationY; 6403 mMatrixDirty = true; 6404 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6405 invalidate(false); 6406 } 6407 } 6408 6409 /** 6410 * Hit rectangle in parent's coordinates 6411 * 6412 * @param outRect The hit rectangle of the view. 6413 */ 6414 public void getHitRect(Rect outRect) { 6415 updateMatrix(); 6416 if (mMatrixIsIdentity || mAttachInfo == null) { 6417 outRect.set(mLeft, mTop, mRight, mBottom); 6418 } else { 6419 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 6420 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 6421 mMatrix.mapRect(tmpRect); 6422 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 6423 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 6424 } 6425 } 6426 6427 /** 6428 * Determines whether the given point, in local coordinates is inside the view. 6429 */ 6430 /*package*/ final boolean pointInView(float localX, float localY) { 6431 return localX >= 0 && localX < (mRight - mLeft) 6432 && localY >= 0 && localY < (mBottom - mTop); 6433 } 6434 6435 /** 6436 * Utility method to determine whether the given point, in local coordinates, 6437 * is inside the view, where the area of the view is expanded by the slop factor. 6438 * This method is called while processing touch-move events to determine if the event 6439 * is still within the view. 6440 */ 6441 private boolean pointInView(float localX, float localY, float slop) { 6442 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 6443 localY < ((mBottom - mTop) + slop); 6444 } 6445 6446 /** 6447 * When a view has focus and the user navigates away from it, the next view is searched for 6448 * starting from the rectangle filled in by this method. 6449 * 6450 * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your 6451 * view maintains some idea of internal selection, such as a cursor, or a selected row 6452 * or column, you should override this method and fill in a more specific rectangle. 6453 * 6454 * @param r The rectangle to fill in, in this view's coordinates. 6455 */ 6456 public void getFocusedRect(Rect r) { 6457 getDrawingRect(r); 6458 } 6459 6460 /** 6461 * If some part of this view is not clipped by any of its parents, then 6462 * return that area in r in global (root) coordinates. To convert r to local 6463 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 6464 * -globalOffset.y)) If the view is completely clipped or translated out, 6465 * return false. 6466 * 6467 * @param r If true is returned, r holds the global coordinates of the 6468 * visible portion of this view. 6469 * @param globalOffset If true is returned, globalOffset holds the dx,dy 6470 * between this view and its root. globalOffet may be null. 6471 * @return true if r is non-empty (i.e. part of the view is visible at the 6472 * root level. 6473 */ 6474 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 6475 int width = mRight - mLeft; 6476 int height = mBottom - mTop; 6477 if (width > 0 && height > 0) { 6478 r.set(0, 0, width, height); 6479 if (globalOffset != null) { 6480 globalOffset.set(-mScrollX, -mScrollY); 6481 } 6482 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 6483 } 6484 return false; 6485 } 6486 6487 public final boolean getGlobalVisibleRect(Rect r) { 6488 return getGlobalVisibleRect(r, null); 6489 } 6490 6491 public final boolean getLocalVisibleRect(Rect r) { 6492 Point offset = new Point(); 6493 if (getGlobalVisibleRect(r, offset)) { 6494 r.offset(-offset.x, -offset.y); // make r local 6495 return true; 6496 } 6497 return false; 6498 } 6499 6500 /** 6501 * Offset this view's vertical location by the specified number of pixels. 6502 * 6503 * @param offset the number of pixels to offset the view by 6504 */ 6505 public void offsetTopAndBottom(int offset) { 6506 if (offset != 0) { 6507 updateMatrix(); 6508 if (mMatrixIsIdentity) { 6509 final ViewParent p = mParent; 6510 if (p != null && mAttachInfo != null) { 6511 final Rect r = mAttachInfo.mTmpInvalRect; 6512 int minTop; 6513 int maxBottom; 6514 int yLoc; 6515 if (offset < 0) { 6516 minTop = mTop + offset; 6517 maxBottom = mBottom; 6518 yLoc = offset; 6519 } else { 6520 minTop = mTop; 6521 maxBottom = mBottom + offset; 6522 yLoc = 0; 6523 } 6524 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 6525 p.invalidateChild(this, r); 6526 } 6527 } else { 6528 invalidate(false); 6529 } 6530 6531 mTop += offset; 6532 mBottom += offset; 6533 6534 if (!mMatrixIsIdentity) { 6535 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6536 invalidate(false); 6537 } 6538 invalidateParentIfNeeded(); 6539 } 6540 } 6541 6542 /** 6543 * Offset this view's horizontal location by the specified amount of pixels. 6544 * 6545 * @param offset the numer of pixels to offset the view by 6546 */ 6547 public void offsetLeftAndRight(int offset) { 6548 if (offset != 0) { 6549 updateMatrix(); 6550 if (mMatrixIsIdentity) { 6551 final ViewParent p = mParent; 6552 if (p != null && mAttachInfo != null) { 6553 final Rect r = mAttachInfo.mTmpInvalRect; 6554 int minLeft; 6555 int maxRight; 6556 if (offset < 0) { 6557 minLeft = mLeft + offset; 6558 maxRight = mRight; 6559 } else { 6560 minLeft = mLeft; 6561 maxRight = mRight + offset; 6562 } 6563 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 6564 p.invalidateChild(this, r); 6565 } 6566 } else { 6567 invalidate(false); 6568 } 6569 6570 mLeft += offset; 6571 mRight += offset; 6572 6573 if (!mMatrixIsIdentity) { 6574 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6575 invalidate(false); 6576 } 6577 invalidateParentIfNeeded(); 6578 } 6579 } 6580 6581 /** 6582 * Get the LayoutParams associated with this view. All views should have 6583 * layout parameters. These supply parameters to the <i>parent</i> of this 6584 * view specifying how it should be arranged. There are many subclasses of 6585 * ViewGroup.LayoutParams, and these correspond to the different subclasses 6586 * of ViewGroup that are responsible for arranging their children. 6587 * @return The LayoutParams associated with this view 6588 */ 6589 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 6590 public ViewGroup.LayoutParams getLayoutParams() { 6591 return mLayoutParams; 6592 } 6593 6594 /** 6595 * Set the layout parameters associated with this view. These supply 6596 * parameters to the <i>parent</i> of this view specifying how it should be 6597 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 6598 * correspond to the different subclasses of ViewGroup that are responsible 6599 * for arranging their children. 6600 * 6601 * @param params the layout parameters for this view 6602 */ 6603 public void setLayoutParams(ViewGroup.LayoutParams params) { 6604 if (params == null) { 6605 throw new NullPointerException("params == null"); 6606 } 6607 mLayoutParams = params; 6608 requestLayout(); 6609 } 6610 6611 /** 6612 * Set the scrolled position of your view. This will cause a call to 6613 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6614 * invalidated. 6615 * @param x the x position to scroll to 6616 * @param y the y position to scroll to 6617 */ 6618 public void scrollTo(int x, int y) { 6619 if (mScrollX != x || mScrollY != y) { 6620 int oldX = mScrollX; 6621 int oldY = mScrollY; 6622 mScrollX = x; 6623 mScrollY = y; 6624 invalidateParentCaches(); 6625 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 6626 if (!awakenScrollBars()) { 6627 invalidate(true); 6628 } 6629 } 6630 } 6631 6632 /** 6633 * Move the scrolled position of your view. This will cause a call to 6634 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6635 * invalidated. 6636 * @param x the amount of pixels to scroll by horizontally 6637 * @param y the amount of pixels to scroll by vertically 6638 */ 6639 public void scrollBy(int x, int y) { 6640 scrollTo(mScrollX + x, mScrollY + y); 6641 } 6642 6643 /** 6644 * <p>Trigger the scrollbars to draw. When invoked this method starts an 6645 * animation to fade the scrollbars out after a default delay. If a subclass 6646 * provides animated scrolling, the start delay should equal the duration 6647 * of the scrolling animation.</p> 6648 * 6649 * <p>The animation starts only if at least one of the scrollbars is 6650 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 6651 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6652 * this method returns true, and false otherwise. If the animation is 6653 * started, this method calls {@link #invalidate()}; in that case the 6654 * caller should not call {@link #invalidate()}.</p> 6655 * 6656 * <p>This method should be invoked every time a subclass directly updates 6657 * the scroll parameters.</p> 6658 * 6659 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 6660 * and {@link #scrollTo(int, int)}.</p> 6661 * 6662 * @return true if the animation is played, false otherwise 6663 * 6664 * @see #awakenScrollBars(int) 6665 * @see #scrollBy(int, int) 6666 * @see #scrollTo(int, int) 6667 * @see #isHorizontalScrollBarEnabled() 6668 * @see #isVerticalScrollBarEnabled() 6669 * @see #setHorizontalScrollBarEnabled(boolean) 6670 * @see #setVerticalScrollBarEnabled(boolean) 6671 */ 6672 protected boolean awakenScrollBars() { 6673 return mScrollCache != null && 6674 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 6675 } 6676 6677 /** 6678 * Trigger the scrollbars to draw. 6679 * This method differs from awakenScrollBars() only in its default duration. 6680 * initialAwakenScrollBars() will show the scroll bars for longer than 6681 * usual to give the user more of a chance to notice them. 6682 * 6683 * @return true if the animation is played, false otherwise. 6684 */ 6685 private boolean initialAwakenScrollBars() { 6686 return mScrollCache != null && 6687 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 6688 } 6689 6690 /** 6691 * <p> 6692 * Trigger the scrollbars to draw. When invoked this method starts an 6693 * animation to fade the scrollbars out after a fixed delay. If a subclass 6694 * provides animated scrolling, the start delay should equal the duration of 6695 * the scrolling animation. 6696 * </p> 6697 * 6698 * <p> 6699 * The animation starts only if at least one of the scrollbars is enabled, 6700 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6701 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6702 * this method returns true, and false otherwise. If the animation is 6703 * started, this method calls {@link #invalidate()}; in that case the caller 6704 * should not call {@link #invalidate()}. 6705 * </p> 6706 * 6707 * <p> 6708 * This method should be invoked everytime a subclass directly updates the 6709 * scroll parameters. 6710 * </p> 6711 * 6712 * @param startDelay the delay, in milliseconds, after which the animation 6713 * should start; when the delay is 0, the animation starts 6714 * immediately 6715 * @return true if the animation is played, false otherwise 6716 * 6717 * @see #scrollBy(int, int) 6718 * @see #scrollTo(int, int) 6719 * @see #isHorizontalScrollBarEnabled() 6720 * @see #isVerticalScrollBarEnabled() 6721 * @see #setHorizontalScrollBarEnabled(boolean) 6722 * @see #setVerticalScrollBarEnabled(boolean) 6723 */ 6724 protected boolean awakenScrollBars(int startDelay) { 6725 return awakenScrollBars(startDelay, true); 6726 } 6727 6728 /** 6729 * <p> 6730 * Trigger the scrollbars to draw. When invoked this method starts an 6731 * animation to fade the scrollbars out after a fixed delay. If a subclass 6732 * provides animated scrolling, the start delay should equal the duration of 6733 * the scrolling animation. 6734 * </p> 6735 * 6736 * <p> 6737 * The animation starts only if at least one of the scrollbars is enabled, 6738 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6739 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6740 * this method returns true, and false otherwise. If the animation is 6741 * started, this method calls {@link #invalidate()} if the invalidate parameter 6742 * is set to true; in that case the caller 6743 * should not call {@link #invalidate()}. 6744 * </p> 6745 * 6746 * <p> 6747 * This method should be invoked everytime a subclass directly updates the 6748 * scroll parameters. 6749 * </p> 6750 * 6751 * @param startDelay the delay, in milliseconds, after which the animation 6752 * should start; when the delay is 0, the animation starts 6753 * immediately 6754 * 6755 * @param invalidate Wheter this method should call invalidate 6756 * 6757 * @return true if the animation is played, false otherwise 6758 * 6759 * @see #scrollBy(int, int) 6760 * @see #scrollTo(int, int) 6761 * @see #isHorizontalScrollBarEnabled() 6762 * @see #isVerticalScrollBarEnabled() 6763 * @see #setHorizontalScrollBarEnabled(boolean) 6764 * @see #setVerticalScrollBarEnabled(boolean) 6765 */ 6766 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 6767 final ScrollabilityCache scrollCache = mScrollCache; 6768 6769 if (scrollCache == null || !scrollCache.fadeScrollBars) { 6770 return false; 6771 } 6772 6773 if (scrollCache.scrollBar == null) { 6774 scrollCache.scrollBar = new ScrollBarDrawable(); 6775 } 6776 6777 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 6778 6779 if (invalidate) { 6780 // Invalidate to show the scrollbars 6781 invalidate(true); 6782 } 6783 6784 if (scrollCache.state == ScrollabilityCache.OFF) { 6785 // FIXME: this is copied from WindowManagerService. 6786 // We should get this value from the system when it 6787 // is possible to do so. 6788 final int KEY_REPEAT_FIRST_DELAY = 750; 6789 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 6790 } 6791 6792 // Tell mScrollCache when we should start fading. This may 6793 // extend the fade start time if one was already scheduled 6794 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 6795 scrollCache.fadeStartTime = fadeStartTime; 6796 scrollCache.state = ScrollabilityCache.ON; 6797 6798 // Schedule our fader to run, unscheduling any old ones first 6799 if (mAttachInfo != null) { 6800 mAttachInfo.mHandler.removeCallbacks(scrollCache); 6801 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 6802 } 6803 6804 return true; 6805 } 6806 6807 return false; 6808 } 6809 6810 /** 6811 * Mark the the area defined by dirty as needing to be drawn. If the view is 6812 * visible, {@link #onDraw} will be called at some point in the future. 6813 * This must be called from a UI thread. To call from a non-UI thread, call 6814 * {@link #postInvalidate()}. 6815 * 6816 * WARNING: This method is destructive to dirty. 6817 * @param dirty the rectangle representing the bounds of the dirty region 6818 */ 6819 public void invalidate(Rect dirty) { 6820 if (ViewDebug.TRACE_HIERARCHY) { 6821 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6822 } 6823 6824 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6825 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 6826 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 6827 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6828 mPrivateFlags |= INVALIDATED; 6829 final ViewParent p = mParent; 6830 final AttachInfo ai = mAttachInfo; 6831 //noinspection PointlessBooleanExpression,ConstantConditions 6832 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 6833 if (p != null && ai != null && ai.mHardwareAccelerated) { 6834 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6835 // with a null dirty rect, which tells the ViewRoot to redraw everything 6836 p.invalidateChild(this, null); 6837 return; 6838 } 6839 } 6840 if (p != null && ai != null) { 6841 final int scrollX = mScrollX; 6842 final int scrollY = mScrollY; 6843 final Rect r = ai.mTmpInvalRect; 6844 r.set(dirty.left - scrollX, dirty.top - scrollY, 6845 dirty.right - scrollX, dirty.bottom - scrollY); 6846 mParent.invalidateChild(this, r); 6847 } 6848 } 6849 } 6850 6851 /** 6852 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 6853 * The coordinates of the dirty rect are relative to the view. 6854 * If the view is visible, {@link #onDraw} will be called at some point 6855 * in the future. This must be called from a UI thread. To call 6856 * from a non-UI thread, call {@link #postInvalidate()}. 6857 * @param l the left position of the dirty region 6858 * @param t the top position of the dirty region 6859 * @param r the right position of the dirty region 6860 * @param b the bottom position of the dirty region 6861 */ 6862 public void invalidate(int l, int t, int r, int b) { 6863 if (ViewDebug.TRACE_HIERARCHY) { 6864 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6865 } 6866 6867 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6868 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID || 6869 (mPrivateFlags & INVALIDATED) != INVALIDATED) { 6870 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6871 mPrivateFlags |= INVALIDATED; 6872 final ViewParent p = mParent; 6873 final AttachInfo ai = mAttachInfo; 6874 //noinspection PointlessBooleanExpression,ConstantConditions 6875 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 6876 if (p != null && ai != null && ai.mHardwareAccelerated) { 6877 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6878 // with a null dirty rect, which tells the ViewRoot to redraw everything 6879 p.invalidateChild(this, null); 6880 return; 6881 } 6882 } 6883 if (p != null && ai != null && l < r && t < b) { 6884 final int scrollX = mScrollX; 6885 final int scrollY = mScrollY; 6886 final Rect tmpr = ai.mTmpInvalRect; 6887 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 6888 p.invalidateChild(this, tmpr); 6889 } 6890 } 6891 } 6892 6893 /** 6894 * Invalidate the whole view. If the view is visible, {@link #onDraw} will 6895 * be called at some point in the future. This must be called from a 6896 * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 6897 */ 6898 public void invalidate() { 6899 invalidate(true); 6900 } 6901 6902 /** 6903 * This is where the invalidate() work actually happens. A full invalidate() 6904 * causes the drawing cache to be invalidated, but this function can be called with 6905 * invalidateCache set to false to skip that invalidation step for cases that do not 6906 * need it (for example, a component that remains at the same dimensions with the same 6907 * content). 6908 * 6909 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 6910 * well. This is usually true for a full invalidate, but may be set to false if the 6911 * View's contents or dimensions have not changed. 6912 */ 6913 private void invalidate(boolean invalidateCache) { 6914 if (ViewDebug.TRACE_HIERARCHY) { 6915 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6916 } 6917 6918 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6919 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) || 6920 (mPrivateFlags & INVALIDATED) != INVALIDATED || isOpaque() != mLastIsOpaque) { 6921 mLastIsOpaque = isOpaque(); 6922 mPrivateFlags &= ~DRAWN; 6923 if (invalidateCache) { 6924 mPrivateFlags |= INVALIDATED; 6925 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6926 } 6927 final AttachInfo ai = mAttachInfo; 6928 final ViewParent p = mParent; 6929 //noinspection PointlessBooleanExpression,ConstantConditions 6930 if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { 6931 if (p != null && ai != null && ai.mHardwareAccelerated) { 6932 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6933 // with a null dirty rect, which tells the ViewRoot to redraw everything 6934 p.invalidateChild(this, null); 6935 return; 6936 } 6937 } 6938 6939 if (p != null && ai != null) { 6940 final Rect r = ai.mTmpInvalRect; 6941 r.set(0, 0, mRight - mLeft, mBottom - mTop); 6942 // Don't call invalidate -- we don't want to internally scroll 6943 // our own bounds 6944 p.invalidateChild(this, r); 6945 } 6946 } 6947 } 6948 6949 /** 6950 * Used to indicate that the parent of this view should clear its caches. This functionality 6951 * is used to force the parent to rebuild its display list (when hardware-accelerated), 6952 * which is necessary when various parent-managed properties of the view change, such as 6953 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method only 6954 * clears the parent caches and does not causes an invalidate event. 6955 * 6956 * @hide 6957 */ 6958 protected void invalidateParentCaches() { 6959 if (mParent instanceof View) { 6960 ((View) mParent).mPrivateFlags |= INVALIDATED; 6961 } 6962 } 6963 6964 /** 6965 * Used to indicate that the parent of this view should be invalidated. This functionality 6966 * is used to force the parent to rebuild its display list (when hardware-accelerated), 6967 * which is necessary when various parent-managed properties of the view change, such as 6968 * alpha, translationX/Y, scrollX/Y, scaleX/Y, and rotation/X/Y. This method will propagate 6969 * an invalidation event to the parent. 6970 * 6971 * @hide 6972 */ 6973 protected void invalidateParentIfNeeded() { 6974 if (isHardwareAccelerated() && mParent instanceof View) { 6975 ((View) mParent).invalidate(true); 6976 } 6977 } 6978 6979 /** 6980 * Indicates whether this View is opaque. An opaque View guarantees that it will 6981 * draw all the pixels overlapping its bounds using a fully opaque color. 6982 * 6983 * Subclasses of View should override this method whenever possible to indicate 6984 * whether an instance is opaque. Opaque Views are treated in a special way by 6985 * the View hierarchy, possibly allowing it to perform optimizations during 6986 * invalidate/draw passes. 6987 * 6988 * @return True if this View is guaranteed to be fully opaque, false otherwise. 6989 */ 6990 @ViewDebug.ExportedProperty(category = "drawing") 6991 public boolean isOpaque() { 6992 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 6993 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 6994 } 6995 6996 /** 6997 * @hide 6998 */ 6999 protected void computeOpaqueFlags() { 7000 // Opaque if: 7001 // - Has a background 7002 // - Background is opaque 7003 // - Doesn't have scrollbars or scrollbars are inside overlay 7004 7005 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 7006 mPrivateFlags |= OPAQUE_BACKGROUND; 7007 } else { 7008 mPrivateFlags &= ~OPAQUE_BACKGROUND; 7009 } 7010 7011 final int flags = mViewFlags; 7012 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 7013 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 7014 mPrivateFlags |= OPAQUE_SCROLLBARS; 7015 } else { 7016 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 7017 } 7018 } 7019 7020 /** 7021 * @hide 7022 */ 7023 protected boolean hasOpaqueScrollbars() { 7024 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 7025 } 7026 7027 /** 7028 * @return A handler associated with the thread running the View. This 7029 * handler can be used to pump events in the UI events queue. 7030 */ 7031 public Handler getHandler() { 7032 if (mAttachInfo != null) { 7033 return mAttachInfo.mHandler; 7034 } 7035 return null; 7036 } 7037 7038 /** 7039 * Causes the Runnable to be added to the message queue. 7040 * The runnable will be run on the user interface thread. 7041 * 7042 * @param action The Runnable that will be executed. 7043 * 7044 * @return Returns true if the Runnable was successfully placed in to the 7045 * message queue. Returns false on failure, usually because the 7046 * looper processing the message queue is exiting. 7047 */ 7048 public boolean post(Runnable action) { 7049 Handler handler; 7050 if (mAttachInfo != null) { 7051 handler = mAttachInfo.mHandler; 7052 } else { 7053 // Assume that post will succeed later 7054 ViewRoot.getRunQueue().post(action); 7055 return true; 7056 } 7057 7058 return handler.post(action); 7059 } 7060 7061 /** 7062 * Causes the Runnable to be added to the message queue, to be run 7063 * after the specified amount of time elapses. 7064 * The runnable will be run on the user interface thread. 7065 * 7066 * @param action The Runnable that will be executed. 7067 * @param delayMillis The delay (in milliseconds) until the Runnable 7068 * will be executed. 7069 * 7070 * @return true if the Runnable was successfully placed in to the 7071 * message queue. Returns false on failure, usually because the 7072 * looper processing the message queue is exiting. Note that a 7073 * result of true does not mean the Runnable will be processed -- 7074 * if the looper is quit before the delivery time of the message 7075 * occurs then the message will be dropped. 7076 */ 7077 public boolean postDelayed(Runnable action, long delayMillis) { 7078 Handler handler; 7079 if (mAttachInfo != null) { 7080 handler = mAttachInfo.mHandler; 7081 } else { 7082 // Assume that post will succeed later 7083 ViewRoot.getRunQueue().postDelayed(action, delayMillis); 7084 return true; 7085 } 7086 7087 return handler.postDelayed(action, delayMillis); 7088 } 7089 7090 /** 7091 * Removes the specified Runnable from the message queue. 7092 * 7093 * @param action The Runnable to remove from the message handling queue 7094 * 7095 * @return true if this view could ask the Handler to remove the Runnable, 7096 * false otherwise. When the returned value is true, the Runnable 7097 * may or may not have been actually removed from the message queue 7098 * (for instance, if the Runnable was not in the queue already.) 7099 */ 7100 public boolean removeCallbacks(Runnable action) { 7101 Handler handler; 7102 if (mAttachInfo != null) { 7103 handler = mAttachInfo.mHandler; 7104 } else { 7105 // Assume that post will succeed later 7106 ViewRoot.getRunQueue().removeCallbacks(action); 7107 return true; 7108 } 7109 7110 handler.removeCallbacks(action); 7111 return true; 7112 } 7113 7114 /** 7115 * Cause an invalidate to happen on a subsequent cycle through the event loop. 7116 * Use this to invalidate the View from a non-UI thread. 7117 * 7118 * @see #invalidate() 7119 */ 7120 public void postInvalidate() { 7121 postInvalidateDelayed(0); 7122 } 7123 7124 /** 7125 * Cause an invalidate of the specified area to happen on a subsequent cycle 7126 * through the event loop. Use this to invalidate the View from a non-UI thread. 7127 * 7128 * @param left The left coordinate of the rectangle to invalidate. 7129 * @param top The top coordinate of the rectangle to invalidate. 7130 * @param right The right coordinate of the rectangle to invalidate. 7131 * @param bottom The bottom coordinate of the rectangle to invalidate. 7132 * 7133 * @see #invalidate(int, int, int, int) 7134 * @see #invalidate(Rect) 7135 */ 7136 public void postInvalidate(int left, int top, int right, int bottom) { 7137 postInvalidateDelayed(0, left, top, right, bottom); 7138 } 7139 7140 /** 7141 * Cause an invalidate to happen on a subsequent cycle through the event 7142 * loop. Waits for the specified amount of time. 7143 * 7144 * @param delayMilliseconds the duration in milliseconds to delay the 7145 * invalidation by 7146 */ 7147 public void postInvalidateDelayed(long delayMilliseconds) { 7148 // We try only with the AttachInfo because there's no point in invalidating 7149 // if we are not attached to our window 7150 if (mAttachInfo != null) { 7151 Message msg = Message.obtain(); 7152 msg.what = AttachInfo.INVALIDATE_MSG; 7153 msg.obj = this; 7154 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 7155 } 7156 } 7157 7158 /** 7159 * Cause an invalidate of the specified area to happen on a subsequent cycle 7160 * through the event loop. Waits for the specified amount of time. 7161 * 7162 * @param delayMilliseconds the duration in milliseconds to delay the 7163 * invalidation by 7164 * @param left The left coordinate of the rectangle to invalidate. 7165 * @param top The top coordinate of the rectangle to invalidate. 7166 * @param right The right coordinate of the rectangle to invalidate. 7167 * @param bottom The bottom coordinate of the rectangle to invalidate. 7168 */ 7169 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 7170 int right, int bottom) { 7171 7172 // We try only with the AttachInfo because there's no point in invalidating 7173 // if we are not attached to our window 7174 if (mAttachInfo != null) { 7175 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 7176 info.target = this; 7177 info.left = left; 7178 info.top = top; 7179 info.right = right; 7180 info.bottom = bottom; 7181 7182 final Message msg = Message.obtain(); 7183 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 7184 msg.obj = info; 7185 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 7186 } 7187 } 7188 7189 /** 7190 * Called by a parent to request that a child update its values for mScrollX 7191 * and mScrollY if necessary. This will typically be done if the child is 7192 * animating a scroll using a {@link android.widget.Scroller Scroller} 7193 * object. 7194 */ 7195 public void computeScroll() { 7196 } 7197 7198 /** 7199 * <p>Indicate whether the horizontal edges are faded when the view is 7200 * scrolled horizontally.</p> 7201 * 7202 * @return true if the horizontal edges should are faded on scroll, false 7203 * otherwise 7204 * 7205 * @see #setHorizontalFadingEdgeEnabled(boolean) 7206 * @attr ref android.R.styleable#View_fadingEdge 7207 */ 7208 public boolean isHorizontalFadingEdgeEnabled() { 7209 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 7210 } 7211 7212 /** 7213 * <p>Define whether the horizontal edges should be faded when this view 7214 * is scrolled horizontally.</p> 7215 * 7216 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 7217 * be faded when the view is scrolled 7218 * horizontally 7219 * 7220 * @see #isHorizontalFadingEdgeEnabled() 7221 * @attr ref android.R.styleable#View_fadingEdge 7222 */ 7223 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 7224 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 7225 if (horizontalFadingEdgeEnabled) { 7226 initScrollCache(); 7227 } 7228 7229 mViewFlags ^= FADING_EDGE_HORIZONTAL; 7230 } 7231 } 7232 7233 /** 7234 * <p>Indicate whether the vertical edges are faded when the view is 7235 * scrolled horizontally.</p> 7236 * 7237 * @return true if the vertical edges should are faded on scroll, false 7238 * otherwise 7239 * 7240 * @see #setVerticalFadingEdgeEnabled(boolean) 7241 * @attr ref android.R.styleable#View_fadingEdge 7242 */ 7243 public boolean isVerticalFadingEdgeEnabled() { 7244 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 7245 } 7246 7247 /** 7248 * <p>Define whether the vertical edges should be faded when this view 7249 * is scrolled vertically.</p> 7250 * 7251 * @param verticalFadingEdgeEnabled true if the vertical edges should 7252 * be faded when the view is scrolled 7253 * vertically 7254 * 7255 * @see #isVerticalFadingEdgeEnabled() 7256 * @attr ref android.R.styleable#View_fadingEdge 7257 */ 7258 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 7259 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 7260 if (verticalFadingEdgeEnabled) { 7261 initScrollCache(); 7262 } 7263 7264 mViewFlags ^= FADING_EDGE_VERTICAL; 7265 } 7266 } 7267 7268 /** 7269 * Returns the strength, or intensity, of the top faded edge. The strength is 7270 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7271 * returns 0.0 or 1.0 but no value in between. 7272 * 7273 * Subclasses should override this method to provide a smoother fade transition 7274 * when scrolling occurs. 7275 * 7276 * @return the intensity of the top fade as a float between 0.0f and 1.0f 7277 */ 7278 protected float getTopFadingEdgeStrength() { 7279 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 7280 } 7281 7282 /** 7283 * Returns the strength, or intensity, of the bottom faded edge. The strength is 7284 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7285 * returns 0.0 or 1.0 but no value in between. 7286 * 7287 * Subclasses should override this method to provide a smoother fade transition 7288 * when scrolling occurs. 7289 * 7290 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 7291 */ 7292 protected float getBottomFadingEdgeStrength() { 7293 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 7294 computeVerticalScrollRange() ? 1.0f : 0.0f; 7295 } 7296 7297 /** 7298 * Returns the strength, or intensity, of the left faded edge. The strength is 7299 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7300 * returns 0.0 or 1.0 but no value in between. 7301 * 7302 * Subclasses should override this method to provide a smoother fade transition 7303 * when scrolling occurs. 7304 * 7305 * @return the intensity of the left fade as a float between 0.0f and 1.0f 7306 */ 7307 protected float getLeftFadingEdgeStrength() { 7308 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 7309 } 7310 7311 /** 7312 * Returns the strength, or intensity, of the right faded edge. The strength is 7313 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7314 * returns 0.0 or 1.0 but no value in between. 7315 * 7316 * Subclasses should override this method to provide a smoother fade transition 7317 * when scrolling occurs. 7318 * 7319 * @return the intensity of the right fade as a float between 0.0f and 1.0f 7320 */ 7321 protected float getRightFadingEdgeStrength() { 7322 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 7323 computeHorizontalScrollRange() ? 1.0f : 0.0f; 7324 } 7325 7326 /** 7327 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 7328 * scrollbar is not drawn by default.</p> 7329 * 7330 * @return true if the horizontal scrollbar should be painted, false 7331 * otherwise 7332 * 7333 * @see #setHorizontalScrollBarEnabled(boolean) 7334 */ 7335 public boolean isHorizontalScrollBarEnabled() { 7336 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7337 } 7338 7339 /** 7340 * <p>Define whether the horizontal scrollbar should be drawn or not. The 7341 * scrollbar is not drawn by default.</p> 7342 * 7343 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 7344 * be painted 7345 * 7346 * @see #isHorizontalScrollBarEnabled() 7347 */ 7348 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 7349 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 7350 mViewFlags ^= SCROLLBARS_HORIZONTAL; 7351 computeOpaqueFlags(); 7352 recomputePadding(); 7353 } 7354 } 7355 7356 /** 7357 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 7358 * scrollbar is not drawn by default.</p> 7359 * 7360 * @return true if the vertical scrollbar should be painted, false 7361 * otherwise 7362 * 7363 * @see #setVerticalScrollBarEnabled(boolean) 7364 */ 7365 public boolean isVerticalScrollBarEnabled() { 7366 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 7367 } 7368 7369 /** 7370 * <p>Define whether the vertical scrollbar should be drawn or not. The 7371 * scrollbar is not drawn by default.</p> 7372 * 7373 * @param verticalScrollBarEnabled true if the vertical scrollbar should 7374 * be painted 7375 * 7376 * @see #isVerticalScrollBarEnabled() 7377 */ 7378 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 7379 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 7380 mViewFlags ^= SCROLLBARS_VERTICAL; 7381 computeOpaqueFlags(); 7382 recomputePadding(); 7383 } 7384 } 7385 7386 /** 7387 * @hide 7388 */ 7389 protected void recomputePadding() { 7390 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 7391 } 7392 7393 /** 7394 * Define whether scrollbars will fade when the view is not scrolling. 7395 * 7396 * @param fadeScrollbars wheter to enable fading 7397 * 7398 */ 7399 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 7400 initScrollCache(); 7401 final ScrollabilityCache scrollabilityCache = mScrollCache; 7402 scrollabilityCache.fadeScrollBars = fadeScrollbars; 7403 if (fadeScrollbars) { 7404 scrollabilityCache.state = ScrollabilityCache.OFF; 7405 } else { 7406 scrollabilityCache.state = ScrollabilityCache.ON; 7407 } 7408 } 7409 7410 /** 7411 * 7412 * Returns true if scrollbars will fade when this view is not scrolling 7413 * 7414 * @return true if scrollbar fading is enabled 7415 */ 7416 public boolean isScrollbarFadingEnabled() { 7417 return mScrollCache != null && mScrollCache.fadeScrollBars; 7418 } 7419 7420 /** 7421 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 7422 * inset. When inset, they add to the padding of the view. And the scrollbars 7423 * can be drawn inside the padding area or on the edge of the view. For example, 7424 * if a view has a background drawable and you want to draw the scrollbars 7425 * inside the padding specified by the drawable, you can use 7426 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 7427 * appear at the edge of the view, ignoring the padding, then you can use 7428 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 7429 * @param style the style of the scrollbars. Should be one of 7430 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 7431 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 7432 * @see #SCROLLBARS_INSIDE_OVERLAY 7433 * @see #SCROLLBARS_INSIDE_INSET 7434 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7435 * @see #SCROLLBARS_OUTSIDE_INSET 7436 */ 7437 public void setScrollBarStyle(int style) { 7438 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 7439 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 7440 computeOpaqueFlags(); 7441 recomputePadding(); 7442 } 7443 } 7444 7445 /** 7446 * <p>Returns the current scrollbar style.</p> 7447 * @return the current scrollbar style 7448 * @see #SCROLLBARS_INSIDE_OVERLAY 7449 * @see #SCROLLBARS_INSIDE_INSET 7450 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7451 * @see #SCROLLBARS_OUTSIDE_INSET 7452 */ 7453 public int getScrollBarStyle() { 7454 return mViewFlags & SCROLLBARS_STYLE_MASK; 7455 } 7456 7457 /** 7458 * <p>Compute the horizontal range that the horizontal scrollbar 7459 * represents.</p> 7460 * 7461 * <p>The range is expressed in arbitrary units that must be the same as the 7462 * units used by {@link #computeHorizontalScrollExtent()} and 7463 * {@link #computeHorizontalScrollOffset()}.</p> 7464 * 7465 * <p>The default range is the drawing width of this view.</p> 7466 * 7467 * @return the total horizontal range represented by the horizontal 7468 * scrollbar 7469 * 7470 * @see #computeHorizontalScrollExtent() 7471 * @see #computeHorizontalScrollOffset() 7472 * @see android.widget.ScrollBarDrawable 7473 */ 7474 protected int computeHorizontalScrollRange() { 7475 return getWidth(); 7476 } 7477 7478 /** 7479 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 7480 * within the horizontal range. This value is used to compute the position 7481 * of the thumb within the scrollbar's track.</p> 7482 * 7483 * <p>The range is expressed in arbitrary units that must be the same as the 7484 * units used by {@link #computeHorizontalScrollRange()} and 7485 * {@link #computeHorizontalScrollExtent()}.</p> 7486 * 7487 * <p>The default offset is the scroll offset of this view.</p> 7488 * 7489 * @return the horizontal offset of the scrollbar's thumb 7490 * 7491 * @see #computeHorizontalScrollRange() 7492 * @see #computeHorizontalScrollExtent() 7493 * @see android.widget.ScrollBarDrawable 7494 */ 7495 protected int computeHorizontalScrollOffset() { 7496 return mScrollX; 7497 } 7498 7499 /** 7500 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 7501 * within the horizontal range. This value is used to compute the length 7502 * of the thumb within the scrollbar's track.</p> 7503 * 7504 * <p>The range is expressed in arbitrary units that must be the same as the 7505 * units used by {@link #computeHorizontalScrollRange()} and 7506 * {@link #computeHorizontalScrollOffset()}.</p> 7507 * 7508 * <p>The default extent is the drawing width of this view.</p> 7509 * 7510 * @return the horizontal extent of the scrollbar's thumb 7511 * 7512 * @see #computeHorizontalScrollRange() 7513 * @see #computeHorizontalScrollOffset() 7514 * @see android.widget.ScrollBarDrawable 7515 */ 7516 protected int computeHorizontalScrollExtent() { 7517 return getWidth(); 7518 } 7519 7520 /** 7521 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 7522 * 7523 * <p>The range is expressed in arbitrary units that must be the same as the 7524 * units used by {@link #computeVerticalScrollExtent()} and 7525 * {@link #computeVerticalScrollOffset()}.</p> 7526 * 7527 * @return the total vertical range represented by the vertical scrollbar 7528 * 7529 * <p>The default range is the drawing height of this view.</p> 7530 * 7531 * @see #computeVerticalScrollExtent() 7532 * @see #computeVerticalScrollOffset() 7533 * @see android.widget.ScrollBarDrawable 7534 */ 7535 protected int computeVerticalScrollRange() { 7536 return getHeight(); 7537 } 7538 7539 /** 7540 * <p>Compute the vertical offset of the vertical scrollbar's thumb 7541 * within the horizontal range. This value is used to compute the position 7542 * of the thumb within the scrollbar's track.</p> 7543 * 7544 * <p>The range is expressed in arbitrary units that must be the same as the 7545 * units used by {@link #computeVerticalScrollRange()} and 7546 * {@link #computeVerticalScrollExtent()}.</p> 7547 * 7548 * <p>The default offset is the scroll offset of this view.</p> 7549 * 7550 * @return the vertical offset of the scrollbar's thumb 7551 * 7552 * @see #computeVerticalScrollRange() 7553 * @see #computeVerticalScrollExtent() 7554 * @see android.widget.ScrollBarDrawable 7555 */ 7556 protected int computeVerticalScrollOffset() { 7557 return mScrollY; 7558 } 7559 7560 /** 7561 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 7562 * within the vertical range. This value is used to compute the length 7563 * of the thumb within the scrollbar's track.</p> 7564 * 7565 * <p>The range is expressed in arbitrary units that must be the same as the 7566 * units used by {@link #computeVerticalScrollRange()} and 7567 * {@link #computeVerticalScrollOffset()}.</p> 7568 * 7569 * <p>The default extent is the drawing height of this view.</p> 7570 * 7571 * @return the vertical extent of the scrollbar's thumb 7572 * 7573 * @see #computeVerticalScrollRange() 7574 * @see #computeVerticalScrollOffset() 7575 * @see android.widget.ScrollBarDrawable 7576 */ 7577 protected int computeVerticalScrollExtent() { 7578 return getHeight(); 7579 } 7580 7581 /** 7582 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 7583 * scrollbars are painted only if they have been awakened first.</p> 7584 * 7585 * @param canvas the canvas on which to draw the scrollbars 7586 * 7587 * @see #awakenScrollBars(int) 7588 */ 7589 protected final void onDrawScrollBars(Canvas canvas) { 7590 // scrollbars are drawn only when the animation is running 7591 final ScrollabilityCache cache = mScrollCache; 7592 if (cache != null) { 7593 7594 int state = cache.state; 7595 7596 if (state == ScrollabilityCache.OFF) { 7597 return; 7598 } 7599 7600 boolean invalidate = false; 7601 7602 if (state == ScrollabilityCache.FADING) { 7603 // We're fading -- get our fade interpolation 7604 if (cache.interpolatorValues == null) { 7605 cache.interpolatorValues = new float[1]; 7606 } 7607 7608 float[] values = cache.interpolatorValues; 7609 7610 // Stops the animation if we're done 7611 if (cache.scrollBarInterpolator.timeToValues(values) == 7612 Interpolator.Result.FREEZE_END) { 7613 cache.state = ScrollabilityCache.OFF; 7614 } else { 7615 cache.scrollBar.setAlpha(Math.round(values[0])); 7616 } 7617 7618 // This will make the scroll bars inval themselves after 7619 // drawing. We only want this when we're fading so that 7620 // we prevent excessive redraws 7621 invalidate = true; 7622 } else { 7623 // We're just on -- but we may have been fading before so 7624 // reset alpha 7625 cache.scrollBar.setAlpha(255); 7626 } 7627 7628 7629 final int viewFlags = mViewFlags; 7630 7631 final boolean drawHorizontalScrollBar = 7632 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7633 final boolean drawVerticalScrollBar = 7634 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 7635 && !isVerticalScrollBarHidden(); 7636 7637 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 7638 final int width = mRight - mLeft; 7639 final int height = mBottom - mTop; 7640 7641 final ScrollBarDrawable scrollBar = cache.scrollBar; 7642 7643 final int scrollX = mScrollX; 7644 final int scrollY = mScrollY; 7645 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 7646 7647 int left, top, right, bottom; 7648 7649 if (drawHorizontalScrollBar) { 7650 int size = scrollBar.getSize(false); 7651 if (size <= 0) { 7652 size = cache.scrollBarSize; 7653 } 7654 7655 scrollBar.setParameters(computeHorizontalScrollRange(), 7656 computeHorizontalScrollOffset(), 7657 computeHorizontalScrollExtent(), false); 7658 final int verticalScrollBarGap = drawVerticalScrollBar ? 7659 getVerticalScrollbarWidth() : 0; 7660 top = scrollY + height - size - (mUserPaddingBottom & inside); 7661 left = scrollX + (mPaddingLeft & inside); 7662 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 7663 bottom = top + size; 7664 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 7665 if (invalidate) { 7666 invalidate(left, top, right, bottom); 7667 } 7668 } 7669 7670 if (drawVerticalScrollBar) { 7671 int size = scrollBar.getSize(true); 7672 if (size <= 0) { 7673 size = cache.scrollBarSize; 7674 } 7675 7676 scrollBar.setParameters(computeVerticalScrollRange(), 7677 computeVerticalScrollOffset(), 7678 computeVerticalScrollExtent(), true); 7679 switch (mVerticalScrollbarPosition) { 7680 default: 7681 case SCROLLBAR_POSITION_DEFAULT: 7682 case SCROLLBAR_POSITION_RIGHT: 7683 left = scrollX + width - size - (mUserPaddingRight & inside); 7684 break; 7685 case SCROLLBAR_POSITION_LEFT: 7686 left = scrollX + (mUserPaddingLeft & inside); 7687 break; 7688 } 7689 top = scrollY + (mPaddingTop & inside); 7690 right = left + size; 7691 bottom = scrollY + height - (mUserPaddingBottom & inside); 7692 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 7693 if (invalidate) { 7694 invalidate(left, top, right, bottom); 7695 } 7696 } 7697 } 7698 } 7699 } 7700 7701 /** 7702 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 7703 * FastScroller is visible. 7704 * @return whether to temporarily hide the vertical scrollbar 7705 * @hide 7706 */ 7707 protected boolean isVerticalScrollBarHidden() { 7708 return false; 7709 } 7710 7711 /** 7712 * <p>Draw the horizontal scrollbar if 7713 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 7714 * 7715 * @param canvas the canvas on which to draw the scrollbar 7716 * @param scrollBar the scrollbar's drawable 7717 * 7718 * @see #isHorizontalScrollBarEnabled() 7719 * @see #computeHorizontalScrollRange() 7720 * @see #computeHorizontalScrollExtent() 7721 * @see #computeHorizontalScrollOffset() 7722 * @see android.widget.ScrollBarDrawable 7723 * @hide 7724 */ 7725 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 7726 int l, int t, int r, int b) { 7727 scrollBar.setBounds(l, t, r, b); 7728 scrollBar.draw(canvas); 7729 } 7730 7731 /** 7732 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 7733 * returns true.</p> 7734 * 7735 * @param canvas the canvas on which to draw the scrollbar 7736 * @param scrollBar the scrollbar's drawable 7737 * 7738 * @see #isVerticalScrollBarEnabled() 7739 * @see #computeVerticalScrollRange() 7740 * @see #computeVerticalScrollExtent() 7741 * @see #computeVerticalScrollOffset() 7742 * @see android.widget.ScrollBarDrawable 7743 * @hide 7744 */ 7745 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 7746 int l, int t, int r, int b) { 7747 scrollBar.setBounds(l, t, r, b); 7748 scrollBar.draw(canvas); 7749 } 7750 7751 /** 7752 * Implement this to do your drawing. 7753 * 7754 * @param canvas the canvas on which the background will be drawn 7755 */ 7756 protected void onDraw(Canvas canvas) { 7757 } 7758 7759 /* 7760 * Caller is responsible for calling requestLayout if necessary. 7761 * (This allows addViewInLayout to not request a new layout.) 7762 */ 7763 void assignParent(ViewParent parent) { 7764 if (mParent == null) { 7765 mParent = parent; 7766 } else if (parent == null) { 7767 mParent = null; 7768 } else { 7769 throw new RuntimeException("view " + this + " being added, but" 7770 + " it already has a parent"); 7771 } 7772 } 7773 7774 /** 7775 * This is called when the view is attached to a window. At this point it 7776 * has a Surface and will start drawing. Note that this function is 7777 * guaranteed to be called before {@link #onDraw}, however it may be called 7778 * any time before the first onDraw -- including before or after 7779 * {@link #onMeasure}. 7780 * 7781 * @see #onDetachedFromWindow() 7782 */ 7783 protected void onAttachedToWindow() { 7784 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 7785 mParent.requestTransparentRegion(this); 7786 } 7787 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 7788 initialAwakenScrollBars(); 7789 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 7790 } 7791 jumpDrawablesToCurrentState(); 7792 } 7793 7794 /** 7795 * This is called when the view is detached from a window. At this point it 7796 * no longer has a surface for drawing. 7797 * 7798 * @see #onAttachedToWindow() 7799 */ 7800 protected void onDetachedFromWindow() { 7801 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 7802 7803 removeUnsetPressCallback(); 7804 removeLongPressCallback(); 7805 removePerformClickCallback(); 7806 7807 destroyDrawingCache(); 7808 7809 if (mHardwareLayer != null) { 7810 mHardwareLayer.destroy(); 7811 mHardwareLayer = null; 7812 } 7813 7814 if (mDisplayList != null) { 7815 mDisplayList.invalidate(); 7816 } 7817 7818 if (mAttachInfo != null) { 7819 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_MSG, this); 7820 mAttachInfo.mHandler.removeMessages(AttachInfo.INVALIDATE_RECT_MSG, this); 7821 } 7822 7823 mCurrentAnimation = null; 7824 } 7825 7826 /** 7827 * @return The number of times this view has been attached to a window 7828 */ 7829 protected int getWindowAttachCount() { 7830 return mWindowAttachCount; 7831 } 7832 7833 /** 7834 * Retrieve a unique token identifying the window this view is attached to. 7835 * @return Return the window's token for use in 7836 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 7837 */ 7838 public IBinder getWindowToken() { 7839 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 7840 } 7841 7842 /** 7843 * Retrieve a unique token identifying the top-level "real" window of 7844 * the window that this view is attached to. That is, this is like 7845 * {@link #getWindowToken}, except if the window this view in is a panel 7846 * window (attached to another containing window), then the token of 7847 * the containing window is returned instead. 7848 * 7849 * @return Returns the associated window token, either 7850 * {@link #getWindowToken()} or the containing window's token. 7851 */ 7852 public IBinder getApplicationWindowToken() { 7853 AttachInfo ai = mAttachInfo; 7854 if (ai != null) { 7855 IBinder appWindowToken = ai.mPanelParentWindowToken; 7856 if (appWindowToken == null) { 7857 appWindowToken = ai.mWindowToken; 7858 } 7859 return appWindowToken; 7860 } 7861 return null; 7862 } 7863 7864 /** 7865 * Retrieve private session object this view hierarchy is using to 7866 * communicate with the window manager. 7867 * @return the session object to communicate with the window manager 7868 */ 7869 /*package*/ IWindowSession getWindowSession() { 7870 return mAttachInfo != null ? mAttachInfo.mSession : null; 7871 } 7872 7873 /** 7874 * @param info the {@link android.view.View.AttachInfo} to associated with 7875 * this view 7876 */ 7877 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 7878 //System.out.println("Attached! " + this); 7879 mAttachInfo = info; 7880 mWindowAttachCount++; 7881 // We will need to evaluate the drawable state at least once. 7882 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 7883 if (mFloatingTreeObserver != null) { 7884 info.mTreeObserver.merge(mFloatingTreeObserver); 7885 mFloatingTreeObserver = null; 7886 } 7887 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 7888 mAttachInfo.mScrollContainers.add(this); 7889 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 7890 } 7891 performCollectViewAttributes(visibility); 7892 onAttachedToWindow(); 7893 int vis = info.mWindowVisibility; 7894 if (vis != GONE) { 7895 onWindowVisibilityChanged(vis); 7896 } 7897 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 7898 // If nobody has evaluated the drawable state yet, then do it now. 7899 refreshDrawableState(); 7900 } 7901 } 7902 7903 void dispatchDetachedFromWindow() { 7904 AttachInfo info = mAttachInfo; 7905 if (info != null) { 7906 int vis = info.mWindowVisibility; 7907 if (vis != GONE) { 7908 onWindowVisibilityChanged(GONE); 7909 } 7910 } 7911 7912 onDetachedFromWindow(); 7913 7914 if ((mPrivateFlags & SCROLL_CONTAINER_ADDED) != 0) { 7915 mAttachInfo.mScrollContainers.remove(this); 7916 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 7917 } 7918 7919 mAttachInfo = null; 7920 } 7921 7922 /** 7923 * Store this view hierarchy's frozen state into the given container. 7924 * 7925 * @param container The SparseArray in which to save the view's state. 7926 * 7927 * @see #restoreHierarchyState 7928 * @see #dispatchSaveInstanceState 7929 * @see #onSaveInstanceState 7930 */ 7931 public void saveHierarchyState(SparseArray<Parcelable> container) { 7932 dispatchSaveInstanceState(container); 7933 } 7934 7935 /** 7936 * Called by {@link #saveHierarchyState} to store the state for this view and its children. 7937 * May be overridden to modify how freezing happens to a view's children; for example, some 7938 * views may want to not store state for their children. 7939 * 7940 * @param container The SparseArray in which to save the view's state. 7941 * 7942 * @see #dispatchRestoreInstanceState 7943 * @see #saveHierarchyState 7944 * @see #onSaveInstanceState 7945 */ 7946 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 7947 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 7948 mPrivateFlags &= ~SAVE_STATE_CALLED; 7949 Parcelable state = onSaveInstanceState(); 7950 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7951 throw new IllegalStateException( 7952 "Derived class did not call super.onSaveInstanceState()"); 7953 } 7954 if (state != null) { 7955 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 7956 // + ": " + state); 7957 container.put(mID, state); 7958 } 7959 } 7960 } 7961 7962 /** 7963 * Hook allowing a view to generate a representation of its internal state 7964 * that can later be used to create a new instance with that same state. 7965 * This state should only contain information that is not persistent or can 7966 * not be reconstructed later. For example, you will never store your 7967 * current position on screen because that will be computed again when a 7968 * new instance of the view is placed in its view hierarchy. 7969 * <p> 7970 * Some examples of things you may store here: the current cursor position 7971 * in a text view (but usually not the text itself since that is stored in a 7972 * content provider or other persistent storage), the currently selected 7973 * item in a list view. 7974 * 7975 * @return Returns a Parcelable object containing the view's current dynamic 7976 * state, or null if there is nothing interesting to save. The 7977 * default implementation returns null. 7978 * @see #onRestoreInstanceState 7979 * @see #saveHierarchyState 7980 * @see #dispatchSaveInstanceState 7981 * @see #setSaveEnabled(boolean) 7982 */ 7983 protected Parcelable onSaveInstanceState() { 7984 mPrivateFlags |= SAVE_STATE_CALLED; 7985 return BaseSavedState.EMPTY_STATE; 7986 } 7987 7988 /** 7989 * Restore this view hierarchy's frozen state from the given container. 7990 * 7991 * @param container The SparseArray which holds previously frozen states. 7992 * 7993 * @see #saveHierarchyState 7994 * @see #dispatchRestoreInstanceState 7995 * @see #onRestoreInstanceState 7996 */ 7997 public void restoreHierarchyState(SparseArray<Parcelable> container) { 7998 dispatchRestoreInstanceState(container); 7999 } 8000 8001 /** 8002 * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its 8003 * children. May be overridden to modify how restoreing happens to a view's children; for 8004 * example, some views may want to not store state for their children. 8005 * 8006 * @param container The SparseArray which holds previously saved state. 8007 * 8008 * @see #dispatchSaveInstanceState 8009 * @see #restoreHierarchyState 8010 * @see #onRestoreInstanceState 8011 */ 8012 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 8013 if (mID != NO_ID) { 8014 Parcelable state = container.get(mID); 8015 if (state != null) { 8016 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 8017 // + ": " + state); 8018 mPrivateFlags &= ~SAVE_STATE_CALLED; 8019 onRestoreInstanceState(state); 8020 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 8021 throw new IllegalStateException( 8022 "Derived class did not call super.onRestoreInstanceState()"); 8023 } 8024 } 8025 } 8026 } 8027 8028 /** 8029 * Hook allowing a view to re-apply a representation of its internal state that had previously 8030 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 8031 * null state. 8032 * 8033 * @param state The frozen state that had previously been returned by 8034 * {@link #onSaveInstanceState}. 8035 * 8036 * @see #onSaveInstanceState 8037 * @see #restoreHierarchyState 8038 * @see #dispatchRestoreInstanceState 8039 */ 8040 protected void onRestoreInstanceState(Parcelable state) { 8041 mPrivateFlags |= SAVE_STATE_CALLED; 8042 if (state != BaseSavedState.EMPTY_STATE && state != null) { 8043 throw new IllegalArgumentException("Wrong state class, expecting View State but " 8044 + "received " + state.getClass().toString() + " instead. This usually happens " 8045 + "when two views of different type have the same id in the same hierarchy. " 8046 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 8047 + "other views do not use the same id."); 8048 } 8049 } 8050 8051 /** 8052 * <p>Return the time at which the drawing of the view hierarchy started.</p> 8053 * 8054 * @return the drawing start time in milliseconds 8055 */ 8056 public long getDrawingTime() { 8057 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 8058 } 8059 8060 /** 8061 * <p>Enables or disables the duplication of the parent's state into this view. When 8062 * duplication is enabled, this view gets its drawable state from its parent rather 8063 * than from its own internal properties.</p> 8064 * 8065 * <p>Note: in the current implementation, setting this property to true after the 8066 * view was added to a ViewGroup might have no effect at all. This property should 8067 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 8068 * 8069 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 8070 * property is enabled, an exception will be thrown.</p> 8071 * 8072 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 8073 * parent, these states should not be affected by this method.</p> 8074 * 8075 * @param enabled True to enable duplication of the parent's drawable state, false 8076 * to disable it. 8077 * 8078 * @see #getDrawableState() 8079 * @see #isDuplicateParentStateEnabled() 8080 */ 8081 public void setDuplicateParentStateEnabled(boolean enabled) { 8082 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 8083 } 8084 8085 /** 8086 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 8087 * 8088 * @return True if this view's drawable state is duplicated from the parent, 8089 * false otherwise 8090 * 8091 * @see #getDrawableState() 8092 * @see #setDuplicateParentStateEnabled(boolean) 8093 */ 8094 public boolean isDuplicateParentStateEnabled() { 8095 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 8096 } 8097 8098 /** 8099 * <p>Specifies the type of layer backing this view. The layer can be 8100 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 8101 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 8102 * 8103 * <p>A layer is associated with an optional {@link android.graphics.Paint} 8104 * instance that controls how the layer is composed on screen. The following 8105 * properties of the paint are taken into account when composing the layer:</p> 8106 * <ul> 8107 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 8108 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 8109 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 8110 * </ul> 8111 * 8112 * <p>If this view has an alpha value set to < 1.0 by calling 8113 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 8114 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 8115 * equivalent to setting a hardware layer on this view and providing a paint with 8116 * the desired alpha value.<p> 8117 * 8118 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 8119 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 8120 * for more information on when and how to use layers.</p> 8121 * 8122 * @param layerType The ype of layer to use with this view, must be one of 8123 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 8124 * {@link #LAYER_TYPE_HARDWARE} 8125 * @param paint The paint used to compose the layer. This argument is optional 8126 * and can be null. It is ignored when the layer type is 8127 * {@link #LAYER_TYPE_NONE} 8128 * 8129 * @see #getLayerType() 8130 * @see #LAYER_TYPE_NONE 8131 * @see #LAYER_TYPE_SOFTWARE 8132 * @see #LAYER_TYPE_HARDWARE 8133 * @see #setAlpha(float) 8134 * 8135 * @attr ref android.R.styleable#View_layerType 8136 */ 8137 public void setLayerType(int layerType, Paint paint) { 8138 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 8139 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 8140 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 8141 } 8142 8143 if (layerType == mLayerType) { 8144 if (layerType != LAYER_TYPE_NONE && paint != mLayerPaint) { 8145 mLayerPaint = paint == null ? new Paint() : paint; 8146 invalidateParentCaches(); 8147 invalidate(true); 8148 } 8149 return; 8150 } 8151 8152 // Destroy any previous software drawing cache if needed 8153 switch (mLayerType) { 8154 case LAYER_TYPE_SOFTWARE: 8155 if (mDrawingCache != null) { 8156 mDrawingCache.recycle(); 8157 mDrawingCache = null; 8158 } 8159 8160 if (mUnscaledDrawingCache != null) { 8161 mUnscaledDrawingCache.recycle(); 8162 mUnscaledDrawingCache = null; 8163 } 8164 break; 8165 case LAYER_TYPE_HARDWARE: 8166 if (mHardwareLayer != null) { 8167 mHardwareLayer.destroy(); 8168 mHardwareLayer = null; 8169 } 8170 break; 8171 default: 8172 break; 8173 } 8174 8175 mLayerType = layerType; 8176 mLayerPaint = mLayerType == LAYER_TYPE_NONE ? null : (paint == null ? new Paint() : paint); 8177 8178 invalidateParentCaches(); 8179 invalidate(true); 8180 } 8181 8182 /** 8183 * Indicates what type of layer is currently associated with this view. By default 8184 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 8185 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 8186 * for more information on the different types of layers. 8187 * 8188 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 8189 * {@link #LAYER_TYPE_HARDWARE} 8190 * 8191 * @see #setLayerType(int, android.graphics.Paint) 8192 * @see #LAYER_TYPE_NONE 8193 * @see #LAYER_TYPE_SOFTWARE 8194 * @see #LAYER_TYPE_HARDWARE 8195 */ 8196 public int getLayerType() { 8197 return mLayerType; 8198 } 8199 8200 /** 8201 * <p>Returns a hardware layer that can be used to draw this view again 8202 * without executing its draw method.</p> 8203 * 8204 * @return A HardwareLayer ready to render, or null if an error occurred. 8205 */ 8206 HardwareLayer getHardwareLayer() { 8207 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8208 return null; 8209 } 8210 8211 final int width = mRight - mLeft; 8212 final int height = mBottom - mTop; 8213 8214 if (width == 0 || height == 0) { 8215 return null; 8216 } 8217 8218 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 8219 if (mHardwareLayer == null) { 8220 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 8221 width, height, isOpaque()); 8222 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 8223 mHardwareLayer.resize(width, height); 8224 } 8225 8226 Canvas currentCanvas = mAttachInfo.mHardwareCanvas; 8227 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 8228 mAttachInfo.mHardwareCanvas = canvas; 8229 try { 8230 canvas.setViewport(width, height); 8231 // TODO: We should pass the dirty rect 8232 canvas.onPreDraw(null); 8233 8234 final int restoreCount = canvas.save(); 8235 8236 computeScroll(); 8237 canvas.translate(-mScrollX, -mScrollY); 8238 8239 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8240 8241 // Fast path for layouts with no backgrounds 8242 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8243 mPrivateFlags &= ~DIRTY_MASK; 8244 dispatchDraw(canvas); 8245 } else { 8246 draw(canvas); 8247 } 8248 8249 canvas.restoreToCount(restoreCount); 8250 } finally { 8251 canvas.onPostDraw(); 8252 mHardwareLayer.end(currentCanvas); 8253 mAttachInfo.mHardwareCanvas = currentCanvas; 8254 } 8255 } 8256 8257 return mHardwareLayer; 8258 } 8259 8260 /** 8261 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 8262 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 8263 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 8264 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 8265 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 8266 * null.</p> 8267 * 8268 * <p>Enabling the drawing cache is similar to 8269 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 8270 * acceleration is turned off. When hardware acceleration is turned on, enabling the 8271 * drawing cache has no effect on rendering because the system uses a different mechanism 8272 * for acceleration which ignores the flag. If you want to use a Bitmap for the view, even 8273 * when hardware acceleration is enabled, see {@link #setLayerType(int, android.graphics.Paint)} 8274 * for information on how to enable software and hardware layers.</p> 8275 * 8276 * <p>This API can be used to manually generate 8277 * a bitmap copy of this view, by setting the flag to <code>true</code> and calling 8278 * {@link #getDrawingCache()}.</p> 8279 * 8280 * @param enabled true to enable the drawing cache, false otherwise 8281 * 8282 * @see #isDrawingCacheEnabled() 8283 * @see #getDrawingCache() 8284 * @see #buildDrawingCache() 8285 * @see #setLayerType(int, android.graphics.Paint) 8286 */ 8287 public void setDrawingCacheEnabled(boolean enabled) { 8288 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 8289 } 8290 8291 /** 8292 * <p>Indicates whether the drawing cache is enabled for this view.</p> 8293 * 8294 * @return true if the drawing cache is enabled 8295 * 8296 * @see #setDrawingCacheEnabled(boolean) 8297 * @see #getDrawingCache() 8298 */ 8299 @ViewDebug.ExportedProperty(category = "drawing") 8300 public boolean isDrawingCacheEnabled() { 8301 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 8302 } 8303 8304 /** 8305 * Debugging utility which recursively outputs the dirty state of a view and its 8306 * descendants. 8307 * 8308 * @hide 8309 */ 8310 public void outputDirtyFlags(String indent, boolean clear, int clearMask) { 8311 Log.d("View", indent + this + " DIRTY(" + (mPrivateFlags & View.DIRTY_MASK) + 8312 ") DRAWN(" + (mPrivateFlags & DRAWN) + ")" + " CACHE_VALID(" + 8313 (mPrivateFlags & View.DRAWING_CACHE_VALID) + 8314 ") INVALIDATED(" + (mPrivateFlags & INVALIDATED) + ")"); 8315 if (clear) { 8316 mPrivateFlags &= clearMask; 8317 } 8318 if (this instanceof ViewGroup) { 8319 ViewGroup parent = (ViewGroup) this; 8320 final int count = parent.getChildCount(); 8321 for (int i = 0; i < count; i++) { 8322 final View child = parent.getChildAt(i); 8323 child.outputDirtyFlags(indent + " ", clear, clearMask); 8324 } 8325 } 8326 } 8327 8328 /** 8329 * This method is used by ViewGroup to cause its children to restore or recreate their 8330 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 8331 * to recreate its own display list, which would happen if it went through the normal 8332 * draw/dispatchDraw mechanisms. 8333 * 8334 * @hide 8335 */ 8336 protected void dispatchGetDisplayList() {} 8337 8338 /** 8339 * A view that is not attached or hardware accelerated cannot create a display list. 8340 * This method checks these conditions and returns the appropriate result. 8341 * 8342 * @return true if view has the ability to create a display list, false otherwise. 8343 * 8344 * @hide 8345 */ 8346 public boolean canHaveDisplayList() { 8347 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8348 return false; 8349 } 8350 return true; 8351 } 8352 8353 /** 8354 * <p>Returns a display list that can be used to draw this view again 8355 * without executing its draw method.</p> 8356 * 8357 * @return A DisplayList ready to replay, or null if caching is not enabled. 8358 * 8359 * @hide 8360 */ 8361 public DisplayList getDisplayList() { 8362 if (!canHaveDisplayList()) { 8363 return null; 8364 } 8365 8366 if (((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 8367 mDisplayList == null || !mDisplayList.isValid() || 8368 mRecreateDisplayList)) { 8369 // Don't need to recreate the display list, just need to tell our 8370 // children to restore/recreate theirs 8371 if (mDisplayList != null && mDisplayList.isValid() && 8372 !mRecreateDisplayList) { 8373 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8374 mPrivateFlags &= ~DIRTY_MASK; 8375 dispatchGetDisplayList(); 8376 8377 return mDisplayList; 8378 } 8379 8380 // If we got here, we're recreating it. Mark it as such to ensure that 8381 // we copy in child display lists into ours in drawChild() 8382 mRecreateDisplayList = true; 8383 if (mDisplayList == null) { 8384 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(this); 8385 // If we're creating a new display list, make sure our parent gets invalidated 8386 // since they will need to recreate their display list to account for this 8387 // new child display list. 8388 invalidateParentCaches(); 8389 } 8390 8391 final HardwareCanvas canvas = mDisplayList.start(); 8392 try { 8393 int width = mRight - mLeft; 8394 int height = mBottom - mTop; 8395 8396 canvas.setViewport(width, height); 8397 // The dirty rect should always be null for a display list 8398 canvas.onPreDraw(null); 8399 8400 final int restoreCount = canvas.save(); 8401 8402 computeScroll(); 8403 canvas.translate(-mScrollX, -mScrollY); 8404 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8405 8406 // Fast path for layouts with no backgrounds 8407 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8408 mPrivateFlags &= ~DIRTY_MASK; 8409 dispatchDraw(canvas); 8410 } else { 8411 draw(canvas); 8412 } 8413 8414 canvas.restoreToCount(restoreCount); 8415 } finally { 8416 canvas.onPostDraw(); 8417 8418 mDisplayList.end(); 8419 } 8420 } else { 8421 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8422 mPrivateFlags &= ~DIRTY_MASK; 8423 } 8424 8425 return mDisplayList; 8426 } 8427 8428 /** 8429 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 8430 * 8431 * @return A non-scaled bitmap representing this view or null if cache is disabled. 8432 * 8433 * @see #getDrawingCache(boolean) 8434 */ 8435 public Bitmap getDrawingCache() { 8436 return getDrawingCache(false); 8437 } 8438 8439 /** 8440 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 8441 * is null when caching is disabled. If caching is enabled and the cache is not ready, 8442 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 8443 * draw from the cache when the cache is enabled. To benefit from the cache, you must 8444 * request the drawing cache by calling this method and draw it on screen if the 8445 * returned bitmap is not null.</p> 8446 * 8447 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8448 * this method will create a bitmap of the same size as this view. Because this bitmap 8449 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8450 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8451 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8452 * size than the view. This implies that your application must be able to handle this 8453 * size.</p> 8454 * 8455 * @param autoScale Indicates whether the generated bitmap should be scaled based on 8456 * the current density of the screen when the application is in compatibility 8457 * mode. 8458 * 8459 * @return A bitmap representing this view or null if cache is disabled. 8460 * 8461 * @see #setDrawingCacheEnabled(boolean) 8462 * @see #isDrawingCacheEnabled() 8463 * @see #buildDrawingCache(boolean) 8464 * @see #destroyDrawingCache() 8465 */ 8466 public Bitmap getDrawingCache(boolean autoScale) { 8467 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8468 return null; 8469 } 8470 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 8471 buildDrawingCache(autoScale); 8472 } 8473 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 8474 } 8475 8476 /** 8477 * <p>Frees the resources used by the drawing cache. If you call 8478 * {@link #buildDrawingCache()} manually without calling 8479 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8480 * should cleanup the cache with this method afterwards.</p> 8481 * 8482 * @see #setDrawingCacheEnabled(boolean) 8483 * @see #buildDrawingCache() 8484 * @see #getDrawingCache() 8485 */ 8486 public void destroyDrawingCache() { 8487 if (mDrawingCache != null) { 8488 mDrawingCache.recycle(); 8489 mDrawingCache = null; 8490 } 8491 if (mUnscaledDrawingCache != null) { 8492 mUnscaledDrawingCache.recycle(); 8493 mUnscaledDrawingCache = null; 8494 } 8495 } 8496 8497 /** 8498 * Setting a solid background color for the drawing cache's bitmaps will improve 8499 * perfromance and memory usage. Note, though that this should only be used if this 8500 * view will always be drawn on top of a solid color. 8501 * 8502 * @param color The background color to use for the drawing cache's bitmap 8503 * 8504 * @see #setDrawingCacheEnabled(boolean) 8505 * @see #buildDrawingCache() 8506 * @see #getDrawingCache() 8507 */ 8508 public void setDrawingCacheBackgroundColor(int color) { 8509 if (color != mDrawingCacheBackgroundColor) { 8510 mDrawingCacheBackgroundColor = color; 8511 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8512 } 8513 } 8514 8515 /** 8516 * @see #setDrawingCacheBackgroundColor(int) 8517 * 8518 * @return The background color to used for the drawing cache's bitmap 8519 */ 8520 public int getDrawingCacheBackgroundColor() { 8521 return mDrawingCacheBackgroundColor; 8522 } 8523 8524 /** 8525 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 8526 * 8527 * @see #buildDrawingCache(boolean) 8528 */ 8529 public void buildDrawingCache() { 8530 buildDrawingCache(false); 8531 } 8532 8533 /** 8534 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 8535 * 8536 * <p>If you call {@link #buildDrawingCache()} manually without calling 8537 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8538 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 8539 * 8540 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8541 * this method will create a bitmap of the same size as this view. Because this bitmap 8542 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8543 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8544 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8545 * size than the view. This implies that your application must be able to handle this 8546 * size.</p> 8547 * 8548 * <p>You should avoid calling this method when hardware acceleration is enabled. If 8549 * you do not need the drawing cache bitmap, calling this method will increase memory 8550 * usage and cause the view to be rendered in software once, thus negatively impacting 8551 * performance.</p> 8552 * 8553 * @see #getDrawingCache() 8554 * @see #destroyDrawingCache() 8555 */ 8556 public void buildDrawingCache(boolean autoScale) { 8557 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 8558 mDrawingCache == null : mUnscaledDrawingCache == null)) { 8559 8560 if (ViewDebug.TRACE_HIERARCHY) { 8561 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 8562 } 8563 8564 int width = mRight - mLeft; 8565 int height = mBottom - mTop; 8566 8567 final AttachInfo attachInfo = mAttachInfo; 8568 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 8569 8570 if (autoScale && scalingRequired) { 8571 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 8572 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 8573 } 8574 8575 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 8576 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 8577 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 8578 8579 if (width <= 0 || height <= 0 || 8580 // Projected bitmap size in bytes 8581 (width * height * (opaque && !use32BitCache ? 2 : 4) > 8582 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 8583 destroyDrawingCache(); 8584 return; 8585 } 8586 8587 boolean clear = true; 8588 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 8589 8590 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 8591 Bitmap.Config quality; 8592 if (!opaque) { 8593 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 8594 case DRAWING_CACHE_QUALITY_AUTO: 8595 quality = Bitmap.Config.ARGB_8888; 8596 break; 8597 case DRAWING_CACHE_QUALITY_LOW: 8598 quality = Bitmap.Config.ARGB_4444; 8599 break; 8600 case DRAWING_CACHE_QUALITY_HIGH: 8601 quality = Bitmap.Config.ARGB_8888; 8602 break; 8603 default: 8604 quality = Bitmap.Config.ARGB_8888; 8605 break; 8606 } 8607 } else { 8608 // Optimization for translucent windows 8609 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 8610 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 8611 } 8612 8613 // Try to cleanup memory 8614 if (bitmap != null) bitmap.recycle(); 8615 8616 try { 8617 bitmap = Bitmap.createBitmap(width, height, quality); 8618 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8619 if (autoScale) { 8620 mDrawingCache = bitmap; 8621 } else { 8622 mUnscaledDrawingCache = bitmap; 8623 } 8624 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 8625 } catch (OutOfMemoryError e) { 8626 // If there is not enough memory to create the bitmap cache, just 8627 // ignore the issue as bitmap caches are not required to draw the 8628 // view hierarchy 8629 if (autoScale) { 8630 mDrawingCache = null; 8631 } else { 8632 mUnscaledDrawingCache = null; 8633 } 8634 return; 8635 } 8636 8637 clear = drawingCacheBackgroundColor != 0; 8638 } 8639 8640 Canvas canvas; 8641 if (attachInfo != null) { 8642 canvas = attachInfo.mCanvas; 8643 if (canvas == null) { 8644 canvas = new Canvas(); 8645 } 8646 canvas.setBitmap(bitmap); 8647 // Temporarily clobber the cached Canvas in case one of our children 8648 // is also using a drawing cache. Without this, the children would 8649 // steal the canvas by attaching their own bitmap to it and bad, bad 8650 // thing would happen (invisible views, corrupted drawings, etc.) 8651 attachInfo.mCanvas = null; 8652 } else { 8653 // This case should hopefully never or seldom happen 8654 canvas = new Canvas(bitmap); 8655 } 8656 8657 if (clear) { 8658 bitmap.eraseColor(drawingCacheBackgroundColor); 8659 } 8660 8661 computeScroll(); 8662 final int restoreCount = canvas.save(); 8663 8664 if (autoScale && scalingRequired) { 8665 final float scale = attachInfo.mApplicationScale; 8666 canvas.scale(scale, scale); 8667 } 8668 8669 canvas.translate(-mScrollX, -mScrollY); 8670 8671 mPrivateFlags |= DRAWN; 8672 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 8673 mLayerType != LAYER_TYPE_NONE) { 8674 mPrivateFlags |= DRAWING_CACHE_VALID; 8675 } 8676 8677 // Fast path for layouts with no backgrounds 8678 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8679 if (ViewDebug.TRACE_HIERARCHY) { 8680 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8681 } 8682 mPrivateFlags &= ~DIRTY_MASK; 8683 dispatchDraw(canvas); 8684 } else { 8685 draw(canvas); 8686 } 8687 8688 canvas.restoreToCount(restoreCount); 8689 8690 if (attachInfo != null) { 8691 // Restore the cached Canvas for our siblings 8692 attachInfo.mCanvas = canvas; 8693 } 8694 } 8695 } 8696 8697 /** 8698 * Create a snapshot of the view into a bitmap. We should probably make 8699 * some form of this public, but should think about the API. 8700 */ 8701 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 8702 int width = mRight - mLeft; 8703 int height = mBottom - mTop; 8704 8705 final AttachInfo attachInfo = mAttachInfo; 8706 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 8707 width = (int) ((width * scale) + 0.5f); 8708 height = (int) ((height * scale) + 0.5f); 8709 8710 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 8711 if (bitmap == null) { 8712 throw new OutOfMemoryError(); 8713 } 8714 8715 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8716 8717 Canvas canvas; 8718 if (attachInfo != null) { 8719 canvas = attachInfo.mCanvas; 8720 if (canvas == null) { 8721 canvas = new Canvas(); 8722 } 8723 canvas.setBitmap(bitmap); 8724 // Temporarily clobber the cached Canvas in case one of our children 8725 // is also using a drawing cache. Without this, the children would 8726 // steal the canvas by attaching their own bitmap to it and bad, bad 8727 // things would happen (invisible views, corrupted drawings, etc.) 8728 attachInfo.mCanvas = null; 8729 } else { 8730 // This case should hopefully never or seldom happen 8731 canvas = new Canvas(bitmap); 8732 } 8733 8734 if ((backgroundColor & 0xff000000) != 0) { 8735 bitmap.eraseColor(backgroundColor); 8736 } 8737 8738 computeScroll(); 8739 final int restoreCount = canvas.save(); 8740 canvas.scale(scale, scale); 8741 canvas.translate(-mScrollX, -mScrollY); 8742 8743 // Temporarily remove the dirty mask 8744 int flags = mPrivateFlags; 8745 mPrivateFlags &= ~DIRTY_MASK; 8746 8747 // Fast path for layouts with no backgrounds 8748 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8749 dispatchDraw(canvas); 8750 } else { 8751 draw(canvas); 8752 } 8753 8754 mPrivateFlags = flags; 8755 8756 canvas.restoreToCount(restoreCount); 8757 8758 if (attachInfo != null) { 8759 // Restore the cached Canvas for our siblings 8760 attachInfo.mCanvas = canvas; 8761 } 8762 8763 return bitmap; 8764 } 8765 8766 /** 8767 * Indicates whether this View is currently in edit mode. A View is usually 8768 * in edit mode when displayed within a developer tool. For instance, if 8769 * this View is being drawn by a visual user interface builder, this method 8770 * should return true. 8771 * 8772 * Subclasses should check the return value of this method to provide 8773 * different behaviors if their normal behavior might interfere with the 8774 * host environment. For instance: the class spawns a thread in its 8775 * constructor, the drawing code relies on device-specific features, etc. 8776 * 8777 * This method is usually checked in the drawing code of custom widgets. 8778 * 8779 * @return True if this View is in edit mode, false otherwise. 8780 */ 8781 public boolean isInEditMode() { 8782 return false; 8783 } 8784 8785 /** 8786 * If the View draws content inside its padding and enables fading edges, 8787 * it needs to support padding offsets. Padding offsets are added to the 8788 * fading edges to extend the length of the fade so that it covers pixels 8789 * drawn inside the padding. 8790 * 8791 * Subclasses of this class should override this method if they need 8792 * to draw content inside the padding. 8793 * 8794 * @return True if padding offset must be applied, false otherwise. 8795 * 8796 * @see #getLeftPaddingOffset() 8797 * @see #getRightPaddingOffset() 8798 * @see #getTopPaddingOffset() 8799 * @see #getBottomPaddingOffset() 8800 * 8801 * @since CURRENT 8802 */ 8803 protected boolean isPaddingOffsetRequired() { 8804 return false; 8805 } 8806 8807 /** 8808 * Amount by which to extend the left fading region. Called only when 8809 * {@link #isPaddingOffsetRequired()} returns true. 8810 * 8811 * @return The left padding offset in pixels. 8812 * 8813 * @see #isPaddingOffsetRequired() 8814 * 8815 * @since CURRENT 8816 */ 8817 protected int getLeftPaddingOffset() { 8818 return 0; 8819 } 8820 8821 /** 8822 * Amount by which to extend the right fading region. Called only when 8823 * {@link #isPaddingOffsetRequired()} returns true. 8824 * 8825 * @return The right padding offset in pixels. 8826 * 8827 * @see #isPaddingOffsetRequired() 8828 * 8829 * @since CURRENT 8830 */ 8831 protected int getRightPaddingOffset() { 8832 return 0; 8833 } 8834 8835 /** 8836 * Amount by which to extend the top fading region. Called only when 8837 * {@link #isPaddingOffsetRequired()} returns true. 8838 * 8839 * @return The top padding offset in pixels. 8840 * 8841 * @see #isPaddingOffsetRequired() 8842 * 8843 * @since CURRENT 8844 */ 8845 protected int getTopPaddingOffset() { 8846 return 0; 8847 } 8848 8849 /** 8850 * Amount by which to extend the bottom fading region. Called only when 8851 * {@link #isPaddingOffsetRequired()} returns true. 8852 * 8853 * @return The bottom padding offset in pixels. 8854 * 8855 * @see #isPaddingOffsetRequired() 8856 * 8857 * @since CURRENT 8858 */ 8859 protected int getBottomPaddingOffset() { 8860 return 0; 8861 } 8862 8863 /** 8864 * <p>Indicates whether this view is attached to an hardware accelerated 8865 * window or not.</p> 8866 * 8867 * <p>Even if this method returns true, it does not mean that every call 8868 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 8869 * accelerated {@link android.graphics.Canvas}. For instance, if this view 8870 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 8871 * window is hardware accelerated, 8872 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 8873 * return false, and this method will return true.</p> 8874 * 8875 * @return True if the view is attached to a window and the window is 8876 * hardware accelerated; false in any other case. 8877 */ 8878 public boolean isHardwareAccelerated() { 8879 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 8880 } 8881 8882 /** 8883 * Manually render this view (and all of its children) to the given Canvas. 8884 * The view must have already done a full layout before this function is 8885 * called. When implementing a view, implement {@link #onDraw} instead of 8886 * overriding this method. If you do need to override this method, call 8887 * the superclass version. 8888 * 8889 * @param canvas The Canvas to which the View is rendered. 8890 */ 8891 public void draw(Canvas canvas) { 8892 if (ViewDebug.TRACE_HIERARCHY) { 8893 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8894 } 8895 8896 final int privateFlags = mPrivateFlags; 8897 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 8898 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 8899 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 8900 8901 /* 8902 * Draw traversal performs several drawing steps which must be executed 8903 * in the appropriate order: 8904 * 8905 * 1. Draw the background 8906 * 2. If necessary, save the canvas' layers to prepare for fading 8907 * 3. Draw view's content 8908 * 4. Draw children 8909 * 5. If necessary, draw the fading edges and restore layers 8910 * 6. Draw decorations (scrollbars for instance) 8911 */ 8912 8913 // Step 1, draw the background, if needed 8914 int saveCount; 8915 8916 if (!dirtyOpaque) { 8917 final Drawable background = mBGDrawable; 8918 if (background != null) { 8919 final int scrollX = mScrollX; 8920 final int scrollY = mScrollY; 8921 8922 if (mBackgroundSizeChanged) { 8923 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 8924 mBackgroundSizeChanged = false; 8925 } 8926 8927 if ((scrollX | scrollY) == 0) { 8928 background.draw(canvas); 8929 } else { 8930 canvas.translate(scrollX, scrollY); 8931 background.draw(canvas); 8932 canvas.translate(-scrollX, -scrollY); 8933 } 8934 } 8935 } 8936 8937 // skip step 2 & 5 if possible (common case) 8938 final int viewFlags = mViewFlags; 8939 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 8940 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 8941 if (!verticalEdges && !horizontalEdges) { 8942 // Step 3, draw the content 8943 if (!dirtyOpaque) onDraw(canvas); 8944 8945 // Step 4, draw the children 8946 dispatchDraw(canvas); 8947 8948 // Step 6, draw decorations (scrollbars) 8949 onDrawScrollBars(canvas); 8950 8951 // we're done... 8952 return; 8953 } 8954 8955 /* 8956 * Here we do the full fledged routine... 8957 * (this is an uncommon case where speed matters less, 8958 * this is why we repeat some of the tests that have been 8959 * done above) 8960 */ 8961 8962 boolean drawTop = false; 8963 boolean drawBottom = false; 8964 boolean drawLeft = false; 8965 boolean drawRight = false; 8966 8967 float topFadeStrength = 0.0f; 8968 float bottomFadeStrength = 0.0f; 8969 float leftFadeStrength = 0.0f; 8970 float rightFadeStrength = 0.0f; 8971 8972 // Step 2, save the canvas' layers 8973 int paddingLeft = mPaddingLeft; 8974 int paddingTop = mPaddingTop; 8975 8976 final boolean offsetRequired = isPaddingOffsetRequired(); 8977 if (offsetRequired) { 8978 paddingLeft += getLeftPaddingOffset(); 8979 paddingTop += getTopPaddingOffset(); 8980 } 8981 8982 int left = mScrollX + paddingLeft; 8983 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 8984 int top = mScrollY + paddingTop; 8985 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 8986 8987 if (offsetRequired) { 8988 right += getRightPaddingOffset(); 8989 bottom += getBottomPaddingOffset(); 8990 } 8991 8992 final ScrollabilityCache scrollabilityCache = mScrollCache; 8993 int length = scrollabilityCache.fadingEdgeLength; 8994 8995 // clip the fade length if top and bottom fades overlap 8996 // overlapping fades produce odd-looking artifacts 8997 if (verticalEdges && (top + length > bottom - length)) { 8998 length = (bottom - top) / 2; 8999 } 9000 9001 // also clip horizontal fades if necessary 9002 if (horizontalEdges && (left + length > right - length)) { 9003 length = (right - left) / 2; 9004 } 9005 9006 if (verticalEdges) { 9007 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 9008 drawTop = topFadeStrength > 0.0f; 9009 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 9010 drawBottom = bottomFadeStrength > 0.0f; 9011 } 9012 9013 if (horizontalEdges) { 9014 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 9015 drawLeft = leftFadeStrength > 0.0f; 9016 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 9017 drawRight = rightFadeStrength > 0.0f; 9018 } 9019 9020 saveCount = canvas.getSaveCount(); 9021 9022 int solidColor = getSolidColor(); 9023 if (solidColor == 0) { 9024 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 9025 9026 if (drawTop) { 9027 canvas.saveLayer(left, top, right, top + length, null, flags); 9028 } 9029 9030 if (drawBottom) { 9031 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 9032 } 9033 9034 if (drawLeft) { 9035 canvas.saveLayer(left, top, left + length, bottom, null, flags); 9036 } 9037 9038 if (drawRight) { 9039 canvas.saveLayer(right - length, top, right, bottom, null, flags); 9040 } 9041 } else { 9042 scrollabilityCache.setFadeColor(solidColor); 9043 } 9044 9045 // Step 3, draw the content 9046 if (!dirtyOpaque) onDraw(canvas); 9047 9048 // Step 4, draw the children 9049 dispatchDraw(canvas); 9050 9051 // Step 5, draw the fade effect and restore layers 9052 final Paint p = scrollabilityCache.paint; 9053 final Matrix matrix = scrollabilityCache.matrix; 9054 final Shader fade = scrollabilityCache.shader; 9055 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 9056 9057 if (drawTop) { 9058 matrix.setScale(1, fadeHeight * topFadeStrength); 9059 matrix.postTranslate(left, top); 9060 fade.setLocalMatrix(matrix); 9061 canvas.drawRect(left, top, right, top + length, p); 9062 } 9063 9064 if (drawBottom) { 9065 matrix.setScale(1, fadeHeight * bottomFadeStrength); 9066 matrix.postRotate(180); 9067 matrix.postTranslate(left, bottom); 9068 fade.setLocalMatrix(matrix); 9069 canvas.drawRect(left, bottom - length, right, bottom, p); 9070 } 9071 9072 if (drawLeft) { 9073 matrix.setScale(1, fadeHeight * leftFadeStrength); 9074 matrix.postRotate(-90); 9075 matrix.postTranslate(left, top); 9076 fade.setLocalMatrix(matrix); 9077 canvas.drawRect(left, top, left + length, bottom, p); 9078 } 9079 9080 if (drawRight) { 9081 matrix.setScale(1, fadeHeight * rightFadeStrength); 9082 matrix.postRotate(90); 9083 matrix.postTranslate(right, top); 9084 fade.setLocalMatrix(matrix); 9085 canvas.drawRect(right - length, top, right, bottom, p); 9086 } 9087 9088 canvas.restoreToCount(saveCount); 9089 9090 // Step 6, draw decorations (scrollbars) 9091 onDrawScrollBars(canvas); 9092 } 9093 9094 /** 9095 * Override this if your view is known to always be drawn on top of a solid color background, 9096 * and needs to draw fading edges. Returning a non-zero color enables the view system to 9097 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 9098 * should be set to 0xFF. 9099 * 9100 * @see #setVerticalFadingEdgeEnabled 9101 * @see #setHorizontalFadingEdgeEnabled 9102 * 9103 * @return The known solid color background for this view, or 0 if the color may vary 9104 */ 9105 public int getSolidColor() { 9106 return 0; 9107 } 9108 9109 /** 9110 * Build a human readable string representation of the specified view flags. 9111 * 9112 * @param flags the view flags to convert to a string 9113 * @return a String representing the supplied flags 9114 */ 9115 private static String printFlags(int flags) { 9116 String output = ""; 9117 int numFlags = 0; 9118 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 9119 output += "TAKES_FOCUS"; 9120 numFlags++; 9121 } 9122 9123 switch (flags & VISIBILITY_MASK) { 9124 case INVISIBLE: 9125 if (numFlags > 0) { 9126 output += " "; 9127 } 9128 output += "INVISIBLE"; 9129 // USELESS HERE numFlags++; 9130 break; 9131 case GONE: 9132 if (numFlags > 0) { 9133 output += " "; 9134 } 9135 output += "GONE"; 9136 // USELESS HERE numFlags++; 9137 break; 9138 default: 9139 break; 9140 } 9141 return output; 9142 } 9143 9144 /** 9145 * Build a human readable string representation of the specified private 9146 * view flags. 9147 * 9148 * @param privateFlags the private view flags to convert to a string 9149 * @return a String representing the supplied flags 9150 */ 9151 private static String printPrivateFlags(int privateFlags) { 9152 String output = ""; 9153 int numFlags = 0; 9154 9155 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 9156 output += "WANTS_FOCUS"; 9157 numFlags++; 9158 } 9159 9160 if ((privateFlags & FOCUSED) == FOCUSED) { 9161 if (numFlags > 0) { 9162 output += " "; 9163 } 9164 output += "FOCUSED"; 9165 numFlags++; 9166 } 9167 9168 if ((privateFlags & SELECTED) == SELECTED) { 9169 if (numFlags > 0) { 9170 output += " "; 9171 } 9172 output += "SELECTED"; 9173 numFlags++; 9174 } 9175 9176 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 9177 if (numFlags > 0) { 9178 output += " "; 9179 } 9180 output += "IS_ROOT_NAMESPACE"; 9181 numFlags++; 9182 } 9183 9184 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 9185 if (numFlags > 0) { 9186 output += " "; 9187 } 9188 output += "HAS_BOUNDS"; 9189 numFlags++; 9190 } 9191 9192 if ((privateFlags & DRAWN) == DRAWN) { 9193 if (numFlags > 0) { 9194 output += " "; 9195 } 9196 output += "DRAWN"; 9197 // USELESS HERE numFlags++; 9198 } 9199 return output; 9200 } 9201 9202 /** 9203 * <p>Indicates whether or not this view's layout will be requested during 9204 * the next hierarchy layout pass.</p> 9205 * 9206 * @return true if the layout will be forced during next layout pass 9207 */ 9208 public boolean isLayoutRequested() { 9209 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 9210 } 9211 9212 /** 9213 * Assign a size and position to a view and all of its 9214 * descendants 9215 * 9216 * <p>This is the second phase of the layout mechanism. 9217 * (The first is measuring). In this phase, each parent calls 9218 * layout on all of its children to position them. 9219 * This is typically done using the child measurements 9220 * that were stored in the measure pass().</p> 9221 * 9222 * <p>Derived classes should not override this method. 9223 * Derived classes with children should override 9224 * onLayout. In that method, they should 9225 * call layout on each of their children.</p> 9226 * 9227 * @param l Left position, relative to parent 9228 * @param t Top position, relative to parent 9229 * @param r Right position, relative to parent 9230 * @param b Bottom position, relative to parent 9231 */ 9232 @SuppressWarnings({"unchecked"}) 9233 public void layout(int l, int t, int r, int b) { 9234 int oldL = mLeft; 9235 int oldT = mTop; 9236 int oldB = mBottom; 9237 int oldR = mRight; 9238 boolean changed = setFrame(l, t, r, b); 9239 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 9240 if (ViewDebug.TRACE_HIERARCHY) { 9241 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 9242 } 9243 9244 onLayout(changed, l, t, r, b); 9245 mPrivateFlags &= ~LAYOUT_REQUIRED; 9246 9247 if (mOnLayoutChangeListeners != null) { 9248 ArrayList<OnLayoutChangeListener> listenersCopy = 9249 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 9250 int numListeners = listenersCopy.size(); 9251 for (int i = 0; i < numListeners; ++i) { 9252 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 9253 } 9254 } 9255 } 9256 mPrivateFlags &= ~FORCE_LAYOUT; 9257 } 9258 9259 /** 9260 * Called from layout when this view should 9261 * assign a size and position to each of its children. 9262 * 9263 * Derived classes with children should override 9264 * this method and call layout on each of 9265 * their children. 9266 * @param changed This is a new size or position for this view 9267 * @param left Left position, relative to parent 9268 * @param top Top position, relative to parent 9269 * @param right Right position, relative to parent 9270 * @param bottom Bottom position, relative to parent 9271 */ 9272 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 9273 } 9274 9275 /** 9276 * Assign a size and position to this view. 9277 * 9278 * This is called from layout. 9279 * 9280 * @param left Left position, relative to parent 9281 * @param top Top position, relative to parent 9282 * @param right Right position, relative to parent 9283 * @param bottom Bottom position, relative to parent 9284 * @return true if the new size and position are different than the 9285 * previous ones 9286 * {@hide} 9287 */ 9288 protected boolean setFrame(int left, int top, int right, int bottom) { 9289 boolean changed = false; 9290 9291 if (DBG) { 9292 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 9293 + right + "," + bottom + ")"); 9294 } 9295 9296 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 9297 changed = true; 9298 9299 // Remember our drawn bit 9300 int drawn = mPrivateFlags & DRAWN; 9301 9302 // Invalidate our old position 9303 invalidate(true); 9304 9305 9306 int oldWidth = mRight - mLeft; 9307 int oldHeight = mBottom - mTop; 9308 9309 mLeft = left; 9310 mTop = top; 9311 mRight = right; 9312 mBottom = bottom; 9313 9314 mPrivateFlags |= HAS_BOUNDS; 9315 9316 int newWidth = right - left; 9317 int newHeight = bottom - top; 9318 9319 if (newWidth != oldWidth || newHeight != oldHeight) { 9320 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 9321 // A change in dimension means an auto-centered pivot point changes, too 9322 mMatrixDirty = true; 9323 } 9324 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 9325 } 9326 9327 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 9328 // If we are visible, force the DRAWN bit to on so that 9329 // this invalidate will go through (at least to our parent). 9330 // This is because someone may have invalidated this view 9331 // before this call to setFrame came in, thereby clearing 9332 // the DRAWN bit. 9333 mPrivateFlags |= DRAWN; 9334 invalidate(true); 9335 // parent display list may need to be recreated based on a change in the bounds 9336 // of any child 9337 invalidateParentCaches(); 9338 } 9339 9340 // Reset drawn bit to original value (invalidate turns it off) 9341 mPrivateFlags |= drawn; 9342 9343 mBackgroundSizeChanged = true; 9344 } 9345 return changed; 9346 } 9347 9348 /** 9349 * Finalize inflating a view from XML. This is called as the last phase 9350 * of inflation, after all child views have been added. 9351 * 9352 * <p>Even if the subclass overrides onFinishInflate, they should always be 9353 * sure to call the super method, so that we get called. 9354 */ 9355 protected void onFinishInflate() { 9356 } 9357 9358 /** 9359 * Returns the resources associated with this view. 9360 * 9361 * @return Resources object. 9362 */ 9363 public Resources getResources() { 9364 return mResources; 9365 } 9366 9367 /** 9368 * Invalidates the specified Drawable. 9369 * 9370 * @param drawable the drawable to invalidate 9371 */ 9372 public void invalidateDrawable(Drawable drawable) { 9373 if (verifyDrawable(drawable)) { 9374 final Rect dirty = drawable.getBounds(); 9375 final int scrollX = mScrollX; 9376 final int scrollY = mScrollY; 9377 9378 invalidate(dirty.left + scrollX, dirty.top + scrollY, 9379 dirty.right + scrollX, dirty.bottom + scrollY); 9380 } 9381 } 9382 9383 /** 9384 * Schedules an action on a drawable to occur at a specified time. 9385 * 9386 * @param who the recipient of the action 9387 * @param what the action to run on the drawable 9388 * @param when the time at which the action must occur. Uses the 9389 * {@link SystemClock#uptimeMillis} timebase. 9390 */ 9391 public void scheduleDrawable(Drawable who, Runnable what, long when) { 9392 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9393 mAttachInfo.mHandler.postAtTime(what, who, when); 9394 } 9395 } 9396 9397 /** 9398 * Cancels a scheduled action on a drawable. 9399 * 9400 * @param who the recipient of the action 9401 * @param what the action to cancel 9402 */ 9403 public void unscheduleDrawable(Drawable who, Runnable what) { 9404 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9405 mAttachInfo.mHandler.removeCallbacks(what, who); 9406 } 9407 } 9408 9409 /** 9410 * Unschedule any events associated with the given Drawable. This can be 9411 * used when selecting a new Drawable into a view, so that the previous 9412 * one is completely unscheduled. 9413 * 9414 * @param who The Drawable to unschedule. 9415 * 9416 * @see #drawableStateChanged 9417 */ 9418 public void unscheduleDrawable(Drawable who) { 9419 if (mAttachInfo != null) { 9420 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 9421 } 9422 } 9423 9424 /** 9425 * If your view subclass is displaying its own Drawable objects, it should 9426 * override this function and return true for any Drawable it is 9427 * displaying. This allows animations for those drawables to be 9428 * scheduled. 9429 * 9430 * <p>Be sure to call through to the super class when overriding this 9431 * function. 9432 * 9433 * @param who The Drawable to verify. Return true if it is one you are 9434 * displaying, else return the result of calling through to the 9435 * super class. 9436 * 9437 * @return boolean If true than the Drawable is being displayed in the 9438 * view; else false and it is not allowed to animate. 9439 * 9440 * @see #unscheduleDrawable 9441 * @see #drawableStateChanged 9442 */ 9443 protected boolean verifyDrawable(Drawable who) { 9444 return who == mBGDrawable; 9445 } 9446 9447 /** 9448 * This function is called whenever the state of the view changes in such 9449 * a way that it impacts the state of drawables being shown. 9450 * 9451 * <p>Be sure to call through to the superclass when overriding this 9452 * function. 9453 * 9454 * @see Drawable#setState 9455 */ 9456 protected void drawableStateChanged() { 9457 Drawable d = mBGDrawable; 9458 if (d != null && d.isStateful()) { 9459 d.setState(getDrawableState()); 9460 } 9461 } 9462 9463 /** 9464 * Call this to force a view to update its drawable state. This will cause 9465 * drawableStateChanged to be called on this view. Views that are interested 9466 * in the new state should call getDrawableState. 9467 * 9468 * @see #drawableStateChanged 9469 * @see #getDrawableState 9470 */ 9471 public void refreshDrawableState() { 9472 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9473 drawableStateChanged(); 9474 9475 ViewParent parent = mParent; 9476 if (parent != null) { 9477 parent.childDrawableStateChanged(this); 9478 } 9479 } 9480 9481 /** 9482 * Return an array of resource IDs of the drawable states representing the 9483 * current state of the view. 9484 * 9485 * @return The current drawable state 9486 * 9487 * @see Drawable#setState 9488 * @see #drawableStateChanged 9489 * @see #onCreateDrawableState 9490 */ 9491 public final int[] getDrawableState() { 9492 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 9493 return mDrawableState; 9494 } else { 9495 mDrawableState = onCreateDrawableState(0); 9496 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 9497 return mDrawableState; 9498 } 9499 } 9500 9501 /** 9502 * Generate the new {@link android.graphics.drawable.Drawable} state for 9503 * this view. This is called by the view 9504 * system when the cached Drawable state is determined to be invalid. To 9505 * retrieve the current state, you should use {@link #getDrawableState}. 9506 * 9507 * @param extraSpace if non-zero, this is the number of extra entries you 9508 * would like in the returned array in which you can place your own 9509 * states. 9510 * 9511 * @return Returns an array holding the current {@link Drawable} state of 9512 * the view. 9513 * 9514 * @see #mergeDrawableStates 9515 */ 9516 protected int[] onCreateDrawableState(int extraSpace) { 9517 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 9518 mParent instanceof View) { 9519 return ((View) mParent).onCreateDrawableState(extraSpace); 9520 } 9521 9522 int[] drawableState; 9523 9524 int privateFlags = mPrivateFlags; 9525 9526 int viewStateIndex = 0; 9527 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 9528 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 9529 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 9530 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 9531 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 9532 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 9533 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested) { 9534 // This is set if HW acceleration is requested, even if the current 9535 // process doesn't allow it. This is just to allow app preview 9536 // windows to better match their app. 9537 viewStateIndex |= VIEW_STATE_ACCELERATED; 9538 } 9539 9540 drawableState = VIEW_STATE_SETS[viewStateIndex]; 9541 9542 //noinspection ConstantIfStatement 9543 if (false) { 9544 Log.i("View", "drawableStateIndex=" + viewStateIndex); 9545 Log.i("View", toString() 9546 + " pressed=" + ((privateFlags & PRESSED) != 0) 9547 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 9548 + " fo=" + hasFocus() 9549 + " sl=" + ((privateFlags & SELECTED) != 0) 9550 + " wf=" + hasWindowFocus() 9551 + ": " + Arrays.toString(drawableState)); 9552 } 9553 9554 if (extraSpace == 0) { 9555 return drawableState; 9556 } 9557 9558 final int[] fullState; 9559 if (drawableState != null) { 9560 fullState = new int[drawableState.length + extraSpace]; 9561 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 9562 } else { 9563 fullState = new int[extraSpace]; 9564 } 9565 9566 return fullState; 9567 } 9568 9569 /** 9570 * Merge your own state values in <var>additionalState</var> into the base 9571 * state values <var>baseState</var> that were returned by 9572 * {@link #onCreateDrawableState}. 9573 * 9574 * @param baseState The base state values returned by 9575 * {@link #onCreateDrawableState}, which will be modified to also hold your 9576 * own additional state values. 9577 * 9578 * @param additionalState The additional state values you would like 9579 * added to <var>baseState</var>; this array is not modified. 9580 * 9581 * @return As a convenience, the <var>baseState</var> array you originally 9582 * passed into the function is returned. 9583 * 9584 * @see #onCreateDrawableState 9585 */ 9586 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 9587 final int N = baseState.length; 9588 int i = N - 1; 9589 while (i >= 0 && baseState[i] == 0) { 9590 i--; 9591 } 9592 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 9593 return baseState; 9594 } 9595 9596 /** 9597 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 9598 * on all Drawable objects associated with this view. 9599 */ 9600 public void jumpDrawablesToCurrentState() { 9601 if (mBGDrawable != null) { 9602 mBGDrawable.jumpToCurrentState(); 9603 } 9604 } 9605 9606 /** 9607 * Sets the background color for this view. 9608 * @param color the color of the background 9609 */ 9610 @RemotableViewMethod 9611 public void setBackgroundColor(int color) { 9612 if (mBGDrawable instanceof ColorDrawable) { 9613 ((ColorDrawable) mBGDrawable).setColor(color); 9614 } else { 9615 setBackgroundDrawable(new ColorDrawable(color)); 9616 } 9617 } 9618 9619 /** 9620 * Set the background to a given resource. The resource should refer to 9621 * a Drawable object or 0 to remove the background. 9622 * @param resid The identifier of the resource. 9623 * @attr ref android.R.styleable#View_background 9624 */ 9625 @RemotableViewMethod 9626 public void setBackgroundResource(int resid) { 9627 if (resid != 0 && resid == mBackgroundResource) { 9628 return; 9629 } 9630 9631 Drawable d= null; 9632 if (resid != 0) { 9633 d = mResources.getDrawable(resid); 9634 } 9635 setBackgroundDrawable(d); 9636 9637 mBackgroundResource = resid; 9638 } 9639 9640 /** 9641 * Set the background to a given Drawable, or remove the background. If the 9642 * background has padding, this View's padding is set to the background's 9643 * padding. However, when a background is removed, this View's padding isn't 9644 * touched. If setting the padding is desired, please use 9645 * {@link #setPadding(int, int, int, int)}. 9646 * 9647 * @param d The Drawable to use as the background, or null to remove the 9648 * background 9649 */ 9650 public void setBackgroundDrawable(Drawable d) { 9651 boolean requestLayout = false; 9652 9653 mBackgroundResource = 0; 9654 9655 /* 9656 * Regardless of whether we're setting a new background or not, we want 9657 * to clear the previous drawable. 9658 */ 9659 if (mBGDrawable != null) { 9660 mBGDrawable.setCallback(null); 9661 unscheduleDrawable(mBGDrawable); 9662 } 9663 9664 if (d != null) { 9665 Rect padding = sThreadLocal.get(); 9666 if (padding == null) { 9667 padding = new Rect(); 9668 sThreadLocal.set(padding); 9669 } 9670 if (d.getPadding(padding)) { 9671 setPadding(padding.left, padding.top, padding.right, padding.bottom); 9672 } 9673 9674 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 9675 // if it has a different minimum size, we should layout again 9676 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 9677 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 9678 requestLayout = true; 9679 } 9680 9681 d.setCallback(this); 9682 if (d.isStateful()) { 9683 d.setState(getDrawableState()); 9684 } 9685 d.setVisible(getVisibility() == VISIBLE, false); 9686 mBGDrawable = d; 9687 9688 if ((mPrivateFlags & SKIP_DRAW) != 0) { 9689 mPrivateFlags &= ~SKIP_DRAW; 9690 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 9691 requestLayout = true; 9692 } 9693 } else { 9694 /* Remove the background */ 9695 mBGDrawable = null; 9696 9697 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 9698 /* 9699 * This view ONLY drew the background before and we're removing 9700 * the background, so now it won't draw anything 9701 * (hence we SKIP_DRAW) 9702 */ 9703 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 9704 mPrivateFlags |= SKIP_DRAW; 9705 } 9706 9707 /* 9708 * When the background is set, we try to apply its padding to this 9709 * View. When the background is removed, we don't touch this View's 9710 * padding. This is noted in the Javadocs. Hence, we don't need to 9711 * requestLayout(), the invalidate() below is sufficient. 9712 */ 9713 9714 // The old background's minimum size could have affected this 9715 // View's layout, so let's requestLayout 9716 requestLayout = true; 9717 } 9718 9719 computeOpaqueFlags(); 9720 9721 if (requestLayout) { 9722 requestLayout(); 9723 } 9724 9725 mBackgroundSizeChanged = true; 9726 invalidate(true); 9727 } 9728 9729 /** 9730 * Gets the background drawable 9731 * @return The drawable used as the background for this view, if any. 9732 */ 9733 public Drawable getBackground() { 9734 return mBGDrawable; 9735 } 9736 9737 /** 9738 * Sets the padding. The view may add on the space required to display 9739 * the scrollbars, depending on the style and visibility of the scrollbars. 9740 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 9741 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 9742 * from the values set in this call. 9743 * 9744 * @attr ref android.R.styleable#View_padding 9745 * @attr ref android.R.styleable#View_paddingBottom 9746 * @attr ref android.R.styleable#View_paddingLeft 9747 * @attr ref android.R.styleable#View_paddingRight 9748 * @attr ref android.R.styleable#View_paddingTop 9749 * @param left the left padding in pixels 9750 * @param top the top padding in pixels 9751 * @param right the right padding in pixels 9752 * @param bottom the bottom padding in pixels 9753 */ 9754 public void setPadding(int left, int top, int right, int bottom) { 9755 boolean changed = false; 9756 9757 mUserPaddingLeft = left; 9758 mUserPaddingRight = right; 9759 mUserPaddingBottom = bottom; 9760 9761 final int viewFlags = mViewFlags; 9762 9763 // Common case is there are no scroll bars. 9764 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 9765 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 9766 // TODO Determine what to do with SCROLLBAR_POSITION_DEFAULT based on RTL settings. 9767 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 9768 ? 0 : getVerticalScrollbarWidth(); 9769 switch (mVerticalScrollbarPosition) { 9770 case SCROLLBAR_POSITION_DEFAULT: 9771 case SCROLLBAR_POSITION_RIGHT: 9772 right += offset; 9773 break; 9774 case SCROLLBAR_POSITION_LEFT: 9775 left += offset; 9776 break; 9777 } 9778 } 9779 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 9780 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 9781 ? 0 : getHorizontalScrollbarHeight(); 9782 } 9783 } 9784 9785 if (mPaddingLeft != left) { 9786 changed = true; 9787 mPaddingLeft = left; 9788 } 9789 if (mPaddingTop != top) { 9790 changed = true; 9791 mPaddingTop = top; 9792 } 9793 if (mPaddingRight != right) { 9794 changed = true; 9795 mPaddingRight = right; 9796 } 9797 if (mPaddingBottom != bottom) { 9798 changed = true; 9799 mPaddingBottom = bottom; 9800 } 9801 9802 if (changed) { 9803 requestLayout(); 9804 } 9805 } 9806 9807 /** 9808 * Returns the top padding of this view. 9809 * 9810 * @return the top padding in pixels 9811 */ 9812 public int getPaddingTop() { 9813 return mPaddingTop; 9814 } 9815 9816 /** 9817 * Returns the bottom padding of this view. If there are inset and enabled 9818 * scrollbars, this value may include the space required to display the 9819 * scrollbars as well. 9820 * 9821 * @return the bottom padding in pixels 9822 */ 9823 public int getPaddingBottom() { 9824 return mPaddingBottom; 9825 } 9826 9827 /** 9828 * Returns the left padding of this view. If there are inset and enabled 9829 * scrollbars, this value may include the space required to display the 9830 * scrollbars as well. 9831 * 9832 * @return the left padding in pixels 9833 */ 9834 public int getPaddingLeft() { 9835 return mPaddingLeft; 9836 } 9837 9838 /** 9839 * Returns the right padding of this view. If there are inset and enabled 9840 * scrollbars, this value may include the space required to display the 9841 * scrollbars as well. 9842 * 9843 * @return the right padding in pixels 9844 */ 9845 public int getPaddingRight() { 9846 return mPaddingRight; 9847 } 9848 9849 /** 9850 * Changes the selection state of this view. A view can be selected or not. 9851 * Note that selection is not the same as focus. Views are typically 9852 * selected in the context of an AdapterView like ListView or GridView; 9853 * the selected view is the view that is highlighted. 9854 * 9855 * @param selected true if the view must be selected, false otherwise 9856 */ 9857 public void setSelected(boolean selected) { 9858 if (((mPrivateFlags & SELECTED) != 0) != selected) { 9859 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 9860 if (!selected) resetPressedState(); 9861 invalidate(true); 9862 refreshDrawableState(); 9863 dispatchSetSelected(selected); 9864 } 9865 } 9866 9867 /** 9868 * Dispatch setSelected to all of this View's children. 9869 * 9870 * @see #setSelected(boolean) 9871 * 9872 * @param selected The new selected state 9873 */ 9874 protected void dispatchSetSelected(boolean selected) { 9875 } 9876 9877 /** 9878 * Indicates the selection state of this view. 9879 * 9880 * @return true if the view is selected, false otherwise 9881 */ 9882 @ViewDebug.ExportedProperty 9883 public boolean isSelected() { 9884 return (mPrivateFlags & SELECTED) != 0; 9885 } 9886 9887 /** 9888 * Changes the activated state of this view. A view can be activated or not. 9889 * Note that activation is not the same as selection. Selection is 9890 * a transient property, representing the view (hierarchy) the user is 9891 * currently interacting with. Activation is a longer-term state that the 9892 * user can move views in and out of. For example, in a list view with 9893 * single or multiple selection enabled, the views in the current selection 9894 * set are activated. (Um, yeah, we are deeply sorry about the terminology 9895 * here.) The activated state is propagated down to children of the view it 9896 * is set on. 9897 * 9898 * @param activated true if the view must be activated, false otherwise 9899 */ 9900 public void setActivated(boolean activated) { 9901 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 9902 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 9903 invalidate(true); 9904 refreshDrawableState(); 9905 dispatchSetActivated(activated); 9906 } 9907 } 9908 9909 /** 9910 * Dispatch setActivated to all of this View's children. 9911 * 9912 * @see #setActivated(boolean) 9913 * 9914 * @param activated The new activated state 9915 */ 9916 protected void dispatchSetActivated(boolean activated) { 9917 } 9918 9919 /** 9920 * Indicates the activation state of this view. 9921 * 9922 * @return true if the view is activated, false otherwise 9923 */ 9924 @ViewDebug.ExportedProperty 9925 public boolean isActivated() { 9926 return (mPrivateFlags & ACTIVATED) != 0; 9927 } 9928 9929 /** 9930 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 9931 * observer can be used to get notifications when global events, like 9932 * layout, happen. 9933 * 9934 * The returned ViewTreeObserver observer is not guaranteed to remain 9935 * valid for the lifetime of this View. If the caller of this method keeps 9936 * a long-lived reference to ViewTreeObserver, it should always check for 9937 * the return value of {@link ViewTreeObserver#isAlive()}. 9938 * 9939 * @return The ViewTreeObserver for this view's hierarchy. 9940 */ 9941 public ViewTreeObserver getViewTreeObserver() { 9942 if (mAttachInfo != null) { 9943 return mAttachInfo.mTreeObserver; 9944 } 9945 if (mFloatingTreeObserver == null) { 9946 mFloatingTreeObserver = new ViewTreeObserver(); 9947 } 9948 return mFloatingTreeObserver; 9949 } 9950 9951 /** 9952 * <p>Finds the topmost view in the current view hierarchy.</p> 9953 * 9954 * @return the topmost view containing this view 9955 */ 9956 public View getRootView() { 9957 if (mAttachInfo != null) { 9958 final View v = mAttachInfo.mRootView; 9959 if (v != null) { 9960 return v; 9961 } 9962 } 9963 9964 View parent = this; 9965 9966 while (parent.mParent != null && parent.mParent instanceof View) { 9967 parent = (View) parent.mParent; 9968 } 9969 9970 return parent; 9971 } 9972 9973 /** 9974 * <p>Computes the coordinates of this view on the screen. The argument 9975 * must be an array of two integers. After the method returns, the array 9976 * contains the x and y location in that order.</p> 9977 * 9978 * @param location an array of two integers in which to hold the coordinates 9979 */ 9980 public void getLocationOnScreen(int[] location) { 9981 getLocationInWindow(location); 9982 9983 final AttachInfo info = mAttachInfo; 9984 if (info != null) { 9985 location[0] += info.mWindowLeft; 9986 location[1] += info.mWindowTop; 9987 } 9988 } 9989 9990 /** 9991 * <p>Computes the coordinates of this view in its window. The argument 9992 * must be an array of two integers. After the method returns, the array 9993 * contains the x and y location in that order.</p> 9994 * 9995 * @param location an array of two integers in which to hold the coordinates 9996 */ 9997 public void getLocationInWindow(int[] location) { 9998 if (location == null || location.length < 2) { 9999 throw new IllegalArgumentException("location must be an array of " 10000 + "two integers"); 10001 } 10002 10003 location[0] = mLeft + (int) (mTranslationX + 0.5f); 10004 location[1] = mTop + (int) (mTranslationY + 0.5f); 10005 10006 ViewParent viewParent = mParent; 10007 while (viewParent instanceof View) { 10008 final View view = (View)viewParent; 10009 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 10010 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 10011 viewParent = view.mParent; 10012 } 10013 10014 if (viewParent instanceof ViewRoot) { 10015 // *cough* 10016 final ViewRoot vr = (ViewRoot)viewParent; 10017 location[1] -= vr.mCurScrollY; 10018 } 10019 } 10020 10021 /** 10022 * {@hide} 10023 * @param id the id of the view to be found 10024 * @return the view of the specified id, null if cannot be found 10025 */ 10026 protected View findViewTraversal(int id) { 10027 if (id == mID) { 10028 return this; 10029 } 10030 return null; 10031 } 10032 10033 /** 10034 * {@hide} 10035 * @param tag the tag of the view to be found 10036 * @return the view of specified tag, null if cannot be found 10037 */ 10038 protected View findViewWithTagTraversal(Object tag) { 10039 if (tag != null && tag.equals(mTag)) { 10040 return this; 10041 } 10042 return null; 10043 } 10044 10045 /** 10046 * {@hide} 10047 * @param predicate The predicate to evaluate. 10048 * @return The first view that matches the predicate or null. 10049 */ 10050 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 10051 if (predicate.apply(this)) { 10052 return this; 10053 } 10054 return null; 10055 } 10056 10057 /** 10058 * Look for a child view with the given id. If this view has the given 10059 * id, return this view. 10060 * 10061 * @param id The id to search for. 10062 * @return The view that has the given id in the hierarchy or null 10063 */ 10064 public final View findViewById(int id) { 10065 if (id < 0) { 10066 return null; 10067 } 10068 return findViewTraversal(id); 10069 } 10070 10071 /** 10072 * Look for a child view with the given tag. If this view has the given 10073 * tag, return this view. 10074 * 10075 * @param tag The tag to search for, using "tag.equals(getTag())". 10076 * @return The View that has the given tag in the hierarchy or null 10077 */ 10078 public final View findViewWithTag(Object tag) { 10079 if (tag == null) { 10080 return null; 10081 } 10082 return findViewWithTagTraversal(tag); 10083 } 10084 10085 /** 10086 * {@hide} 10087 * Look for a child view that matches the specified predicate. 10088 * If this view matches the predicate, return this view. 10089 * 10090 * @param predicate The predicate to evaluate. 10091 * @return The first view that matches the predicate or null. 10092 */ 10093 public final View findViewByPredicate(Predicate<View> predicate) { 10094 return findViewByPredicateTraversal(predicate); 10095 } 10096 10097 /** 10098 * Sets the identifier for this view. The identifier does not have to be 10099 * unique in this view's hierarchy. The identifier should be a positive 10100 * number. 10101 * 10102 * @see #NO_ID 10103 * @see #getId 10104 * @see #findViewById 10105 * 10106 * @param id a number used to identify the view 10107 * 10108 * @attr ref android.R.styleable#View_id 10109 */ 10110 public void setId(int id) { 10111 mID = id; 10112 } 10113 10114 /** 10115 * {@hide} 10116 * 10117 * @param isRoot true if the view belongs to the root namespace, false 10118 * otherwise 10119 */ 10120 public void setIsRootNamespace(boolean isRoot) { 10121 if (isRoot) { 10122 mPrivateFlags |= IS_ROOT_NAMESPACE; 10123 } else { 10124 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 10125 } 10126 } 10127 10128 /** 10129 * {@hide} 10130 * 10131 * @return true if the view belongs to the root namespace, false otherwise 10132 */ 10133 public boolean isRootNamespace() { 10134 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 10135 } 10136 10137 /** 10138 * Returns this view's identifier. 10139 * 10140 * @return a positive integer used to identify the view or {@link #NO_ID} 10141 * if the view has no ID 10142 * 10143 * @see #setId 10144 * @see #findViewById 10145 * @attr ref android.R.styleable#View_id 10146 */ 10147 @ViewDebug.CapturedViewProperty 10148 public int getId() { 10149 return mID; 10150 } 10151 10152 /** 10153 * Returns this view's tag. 10154 * 10155 * @return the Object stored in this view as a tag 10156 * 10157 * @see #setTag(Object) 10158 * @see #getTag(int) 10159 */ 10160 @ViewDebug.ExportedProperty 10161 public Object getTag() { 10162 return mTag; 10163 } 10164 10165 /** 10166 * Sets the tag associated with this view. A tag can be used to mark 10167 * a view in its hierarchy and does not have to be unique within the 10168 * hierarchy. Tags can also be used to store data within a view without 10169 * resorting to another data structure. 10170 * 10171 * @param tag an Object to tag the view with 10172 * 10173 * @see #getTag() 10174 * @see #setTag(int, Object) 10175 */ 10176 public void setTag(final Object tag) { 10177 mTag = tag; 10178 } 10179 10180 /** 10181 * Returns the tag associated with this view and the specified key. 10182 * 10183 * @param key The key identifying the tag 10184 * 10185 * @return the Object stored in this view as a tag 10186 * 10187 * @see #setTag(int, Object) 10188 * @see #getTag() 10189 */ 10190 public Object getTag(int key) { 10191 SparseArray<Object> tags = null; 10192 synchronized (sTagsLock) { 10193 if (sTags != null) { 10194 tags = sTags.get(this); 10195 } 10196 } 10197 10198 if (tags != null) return tags.get(key); 10199 return null; 10200 } 10201 10202 /** 10203 * Sets a tag associated with this view and a key. A tag can be used 10204 * to mark a view in its hierarchy and does not have to be unique within 10205 * the hierarchy. Tags can also be used to store data within a view 10206 * without resorting to another data structure. 10207 * 10208 * The specified key should be an id declared in the resources of the 10209 * application to ensure it is unique (see the <a 10210 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 10211 * Keys identified as belonging to 10212 * the Android framework or not associated with any package will cause 10213 * an {@link IllegalArgumentException} to be thrown. 10214 * 10215 * @param key The key identifying the tag 10216 * @param tag An Object to tag the view with 10217 * 10218 * @throws IllegalArgumentException If they specified key is not valid 10219 * 10220 * @see #setTag(Object) 10221 * @see #getTag(int) 10222 */ 10223 public void setTag(int key, final Object tag) { 10224 // If the package id is 0x00 or 0x01, it's either an undefined package 10225 // or a framework id 10226 if ((key >>> 24) < 2) { 10227 throw new IllegalArgumentException("The key must be an application-specific " 10228 + "resource id."); 10229 } 10230 10231 setTagInternal(this, key, tag); 10232 } 10233 10234 /** 10235 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 10236 * framework id. 10237 * 10238 * @hide 10239 */ 10240 public void setTagInternal(int key, Object tag) { 10241 if ((key >>> 24) != 0x1) { 10242 throw new IllegalArgumentException("The key must be a framework-specific " 10243 + "resource id."); 10244 } 10245 10246 setTagInternal(this, key, tag); 10247 } 10248 10249 private static void setTagInternal(View view, int key, Object tag) { 10250 SparseArray<Object> tags = null; 10251 synchronized (sTagsLock) { 10252 if (sTags == null) { 10253 sTags = new WeakHashMap<View, SparseArray<Object>>(); 10254 } else { 10255 tags = sTags.get(view); 10256 } 10257 } 10258 10259 if (tags == null) { 10260 tags = new SparseArray<Object>(2); 10261 synchronized (sTagsLock) { 10262 sTags.put(view, tags); 10263 } 10264 } 10265 10266 tags.put(key, tag); 10267 } 10268 10269 /** 10270 * @param consistency The type of consistency. See ViewDebug for more information. 10271 * 10272 * @hide 10273 */ 10274 protected boolean dispatchConsistencyCheck(int consistency) { 10275 return onConsistencyCheck(consistency); 10276 } 10277 10278 /** 10279 * Method that subclasses should implement to check their consistency. The type of 10280 * consistency check is indicated by the bit field passed as a parameter. 10281 * 10282 * @param consistency The type of consistency. See ViewDebug for more information. 10283 * 10284 * @throws IllegalStateException if the view is in an inconsistent state. 10285 * 10286 * @hide 10287 */ 10288 protected boolean onConsistencyCheck(int consistency) { 10289 boolean result = true; 10290 10291 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 10292 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 10293 10294 if (checkLayout) { 10295 if (getParent() == null) { 10296 result = false; 10297 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10298 "View " + this + " does not have a parent."); 10299 } 10300 10301 if (mAttachInfo == null) { 10302 result = false; 10303 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10304 "View " + this + " is not attached to a window."); 10305 } 10306 } 10307 10308 if (checkDrawing) { 10309 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 10310 // from their draw() method 10311 10312 if ((mPrivateFlags & DRAWN) != DRAWN && 10313 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 10314 result = false; 10315 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 10316 "View " + this + " was invalidated but its drawing cache is valid."); 10317 } 10318 } 10319 10320 return result; 10321 } 10322 10323 /** 10324 * Prints information about this view in the log output, with the tag 10325 * {@link #VIEW_LOG_TAG}. 10326 * 10327 * @hide 10328 */ 10329 public void debug() { 10330 debug(0); 10331 } 10332 10333 /** 10334 * Prints information about this view in the log output, with the tag 10335 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 10336 * indentation defined by the <code>depth</code>. 10337 * 10338 * @param depth the indentation level 10339 * 10340 * @hide 10341 */ 10342 protected void debug(int depth) { 10343 String output = debugIndent(depth - 1); 10344 10345 output += "+ " + this; 10346 int id = getId(); 10347 if (id != -1) { 10348 output += " (id=" + id + ")"; 10349 } 10350 Object tag = getTag(); 10351 if (tag != null) { 10352 output += " (tag=" + tag + ")"; 10353 } 10354 Log.d(VIEW_LOG_TAG, output); 10355 10356 if ((mPrivateFlags & FOCUSED) != 0) { 10357 output = debugIndent(depth) + " FOCUSED"; 10358 Log.d(VIEW_LOG_TAG, output); 10359 } 10360 10361 output = debugIndent(depth); 10362 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 10363 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 10364 + "} "; 10365 Log.d(VIEW_LOG_TAG, output); 10366 10367 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 10368 || mPaddingBottom != 0) { 10369 output = debugIndent(depth); 10370 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 10371 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 10372 Log.d(VIEW_LOG_TAG, output); 10373 } 10374 10375 output = debugIndent(depth); 10376 output += "mMeasureWidth=" + mMeasuredWidth + 10377 " mMeasureHeight=" + mMeasuredHeight; 10378 Log.d(VIEW_LOG_TAG, output); 10379 10380 output = debugIndent(depth); 10381 if (mLayoutParams == null) { 10382 output += "BAD! no layout params"; 10383 } else { 10384 output = mLayoutParams.debug(output); 10385 } 10386 Log.d(VIEW_LOG_TAG, output); 10387 10388 output = debugIndent(depth); 10389 output += "flags={"; 10390 output += View.printFlags(mViewFlags); 10391 output += "}"; 10392 Log.d(VIEW_LOG_TAG, output); 10393 10394 output = debugIndent(depth); 10395 output += "privateFlags={"; 10396 output += View.printPrivateFlags(mPrivateFlags); 10397 output += "}"; 10398 Log.d(VIEW_LOG_TAG, output); 10399 } 10400 10401 /** 10402 * Creates an string of whitespaces used for indentation. 10403 * 10404 * @param depth the indentation level 10405 * @return a String containing (depth * 2 + 3) * 2 white spaces 10406 * 10407 * @hide 10408 */ 10409 protected static String debugIndent(int depth) { 10410 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 10411 for (int i = 0; i < (depth * 2) + 3; i++) { 10412 spaces.append(' ').append(' '); 10413 } 10414 return spaces.toString(); 10415 } 10416 10417 /** 10418 * <p>Return the offset of the widget's text baseline from the widget's top 10419 * boundary. If this widget does not support baseline alignment, this 10420 * method returns -1. </p> 10421 * 10422 * @return the offset of the baseline within the widget's bounds or -1 10423 * if baseline alignment is not supported 10424 */ 10425 @ViewDebug.ExportedProperty(category = "layout") 10426 public int getBaseline() { 10427 return -1; 10428 } 10429 10430 /** 10431 * Call this when something has changed which has invalidated the 10432 * layout of this view. This will schedule a layout pass of the view 10433 * tree. 10434 */ 10435 public void requestLayout() { 10436 if (ViewDebug.TRACE_HIERARCHY) { 10437 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 10438 } 10439 10440 mPrivateFlags |= FORCE_LAYOUT; 10441 mPrivateFlags |= INVALIDATED; 10442 10443 if (mParent != null && !mParent.isLayoutRequested()) { 10444 mParent.requestLayout(); 10445 } 10446 } 10447 10448 /** 10449 * Forces this view to be laid out during the next layout pass. 10450 * This method does not call requestLayout() or forceLayout() 10451 * on the parent. 10452 */ 10453 public void forceLayout() { 10454 mPrivateFlags |= FORCE_LAYOUT; 10455 mPrivateFlags |= INVALIDATED; 10456 } 10457 10458 /** 10459 * <p> 10460 * This is called to find out how big a view should be. The parent 10461 * supplies constraint information in the width and height parameters. 10462 * </p> 10463 * 10464 * <p> 10465 * The actual mesurement work of a view is performed in 10466 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 10467 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 10468 * </p> 10469 * 10470 * 10471 * @param widthMeasureSpec Horizontal space requirements as imposed by the 10472 * parent 10473 * @param heightMeasureSpec Vertical space requirements as imposed by the 10474 * parent 10475 * 10476 * @see #onMeasure(int, int) 10477 */ 10478 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 10479 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 10480 widthMeasureSpec != mOldWidthMeasureSpec || 10481 heightMeasureSpec != mOldHeightMeasureSpec) { 10482 10483 // first clears the measured dimension flag 10484 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 10485 10486 if (ViewDebug.TRACE_HIERARCHY) { 10487 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 10488 } 10489 10490 // measure ourselves, this should set the measured dimension flag back 10491 onMeasure(widthMeasureSpec, heightMeasureSpec); 10492 10493 // flag not set, setMeasuredDimension() was not invoked, we raise 10494 // an exception to warn the developer 10495 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 10496 throw new IllegalStateException("onMeasure() did not set the" 10497 + " measured dimension by calling" 10498 + " setMeasuredDimension()"); 10499 } 10500 10501 mPrivateFlags |= LAYOUT_REQUIRED; 10502 } 10503 10504 mOldWidthMeasureSpec = widthMeasureSpec; 10505 mOldHeightMeasureSpec = heightMeasureSpec; 10506 } 10507 10508 /** 10509 * <p> 10510 * Measure the view and its content to determine the measured width and the 10511 * measured height. This method is invoked by {@link #measure(int, int)} and 10512 * should be overriden by subclasses to provide accurate and efficient 10513 * measurement of their contents. 10514 * </p> 10515 * 10516 * <p> 10517 * <strong>CONTRACT:</strong> When overriding this method, you 10518 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 10519 * measured width and height of this view. Failure to do so will trigger an 10520 * <code>IllegalStateException</code>, thrown by 10521 * {@link #measure(int, int)}. Calling the superclass' 10522 * {@link #onMeasure(int, int)} is a valid use. 10523 * </p> 10524 * 10525 * <p> 10526 * The base class implementation of measure defaults to the background size, 10527 * unless a larger size is allowed by the MeasureSpec. Subclasses should 10528 * override {@link #onMeasure(int, int)} to provide better measurements of 10529 * their content. 10530 * </p> 10531 * 10532 * <p> 10533 * If this method is overridden, it is the subclass's responsibility to make 10534 * sure the measured height and width are at least the view's minimum height 10535 * and width ({@link #getSuggestedMinimumHeight()} and 10536 * {@link #getSuggestedMinimumWidth()}). 10537 * </p> 10538 * 10539 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 10540 * The requirements are encoded with 10541 * {@link android.view.View.MeasureSpec}. 10542 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 10543 * The requirements are encoded with 10544 * {@link android.view.View.MeasureSpec}. 10545 * 10546 * @see #getMeasuredWidth() 10547 * @see #getMeasuredHeight() 10548 * @see #setMeasuredDimension(int, int) 10549 * @see #getSuggestedMinimumHeight() 10550 * @see #getSuggestedMinimumWidth() 10551 * @see android.view.View.MeasureSpec#getMode(int) 10552 * @see android.view.View.MeasureSpec#getSize(int) 10553 */ 10554 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 10555 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 10556 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 10557 } 10558 10559 /** 10560 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 10561 * measured width and measured height. Failing to do so will trigger an 10562 * exception at measurement time.</p> 10563 * 10564 * @param measuredWidth The measured width of this view. May be a complex 10565 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10566 * {@link #MEASURED_STATE_TOO_SMALL}. 10567 * @param measuredHeight The measured height of this view. May be a complex 10568 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10569 * {@link #MEASURED_STATE_TOO_SMALL}. 10570 */ 10571 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 10572 mMeasuredWidth = measuredWidth; 10573 mMeasuredHeight = measuredHeight; 10574 10575 mPrivateFlags |= MEASURED_DIMENSION_SET; 10576 } 10577 10578 /** 10579 * Merge two states as returned by {@link #getMeasuredState()}. 10580 * @param curState The current state as returned from a view or the result 10581 * of combining multiple views. 10582 * @param newState The new view state to combine. 10583 * @return Returns a new integer reflecting the combination of the two 10584 * states. 10585 */ 10586 public static int combineMeasuredStates(int curState, int newState) { 10587 return curState | newState; 10588 } 10589 10590 /** 10591 * Version of {@link #resolveSizeAndState(int, int, int)} 10592 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 10593 */ 10594 public static int resolveSize(int size, int measureSpec) { 10595 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 10596 } 10597 10598 /** 10599 * Utility to reconcile a desired size and state, with constraints imposed 10600 * by a MeasureSpec. Will take the desired size, unless a different size 10601 * is imposed by the constraints. The returned value is a compound integer, 10602 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 10603 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 10604 * size is smaller than the size the view wants to be. 10605 * 10606 * @param size How big the view wants to be 10607 * @param measureSpec Constraints imposed by the parent 10608 * @return Size information bit mask as defined by 10609 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 10610 */ 10611 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 10612 int result = size; 10613 int specMode = MeasureSpec.getMode(measureSpec); 10614 int specSize = MeasureSpec.getSize(measureSpec); 10615 switch (specMode) { 10616 case MeasureSpec.UNSPECIFIED: 10617 result = size; 10618 break; 10619 case MeasureSpec.AT_MOST: 10620 if (specSize < size) { 10621 result = specSize | MEASURED_STATE_TOO_SMALL; 10622 } else { 10623 result = size; 10624 } 10625 break; 10626 case MeasureSpec.EXACTLY: 10627 result = specSize; 10628 break; 10629 } 10630 return result | (childMeasuredState&MEASURED_STATE_MASK); 10631 } 10632 10633 /** 10634 * Utility to return a default size. Uses the supplied size if the 10635 * MeasureSpec imposed no contraints. Will get larger if allowed 10636 * by the MeasureSpec. 10637 * 10638 * @param size Default size for this view 10639 * @param measureSpec Constraints imposed by the parent 10640 * @return The size this view should be. 10641 */ 10642 public static int getDefaultSize(int size, int measureSpec) { 10643 int result = size; 10644 int specMode = MeasureSpec.getMode(measureSpec); 10645 int specSize = MeasureSpec.getSize(measureSpec); 10646 10647 switch (specMode) { 10648 case MeasureSpec.UNSPECIFIED: 10649 result = size; 10650 break; 10651 case MeasureSpec.AT_MOST: 10652 case MeasureSpec.EXACTLY: 10653 result = specSize; 10654 break; 10655 } 10656 return result; 10657 } 10658 10659 /** 10660 * Returns the suggested minimum height that the view should use. This 10661 * returns the maximum of the view's minimum height 10662 * and the background's minimum height 10663 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 10664 * <p> 10665 * When being used in {@link #onMeasure(int, int)}, the caller should still 10666 * ensure the returned height is within the requirements of the parent. 10667 * 10668 * @return The suggested minimum height of the view. 10669 */ 10670 protected int getSuggestedMinimumHeight() { 10671 int suggestedMinHeight = mMinHeight; 10672 10673 if (mBGDrawable != null) { 10674 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 10675 if (suggestedMinHeight < bgMinHeight) { 10676 suggestedMinHeight = bgMinHeight; 10677 } 10678 } 10679 10680 return suggestedMinHeight; 10681 } 10682 10683 /** 10684 * Returns the suggested minimum width that the view should use. This 10685 * returns the maximum of the view's minimum width) 10686 * and the background's minimum width 10687 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 10688 * <p> 10689 * When being used in {@link #onMeasure(int, int)}, the caller should still 10690 * ensure the returned width is within the requirements of the parent. 10691 * 10692 * @return The suggested minimum width of the view. 10693 */ 10694 protected int getSuggestedMinimumWidth() { 10695 int suggestedMinWidth = mMinWidth; 10696 10697 if (mBGDrawable != null) { 10698 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 10699 if (suggestedMinWidth < bgMinWidth) { 10700 suggestedMinWidth = bgMinWidth; 10701 } 10702 } 10703 10704 return suggestedMinWidth; 10705 } 10706 10707 /** 10708 * Sets the minimum height of the view. It is not guaranteed the view will 10709 * be able to achieve this minimum height (for example, if its parent layout 10710 * constrains it with less available height). 10711 * 10712 * @param minHeight The minimum height the view will try to be. 10713 */ 10714 public void setMinimumHeight(int minHeight) { 10715 mMinHeight = minHeight; 10716 } 10717 10718 /** 10719 * Sets the minimum width of the view. It is not guaranteed the view will 10720 * be able to achieve this minimum width (for example, if its parent layout 10721 * constrains it with less available width). 10722 * 10723 * @param minWidth The minimum width the view will try to be. 10724 */ 10725 public void setMinimumWidth(int minWidth) { 10726 mMinWidth = minWidth; 10727 } 10728 10729 /** 10730 * Get the animation currently associated with this view. 10731 * 10732 * @return The animation that is currently playing or 10733 * scheduled to play for this view. 10734 */ 10735 public Animation getAnimation() { 10736 return mCurrentAnimation; 10737 } 10738 10739 /** 10740 * Start the specified animation now. 10741 * 10742 * @param animation the animation to start now 10743 */ 10744 public void startAnimation(Animation animation) { 10745 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 10746 setAnimation(animation); 10747 invalidateParentCaches(); 10748 invalidate(true); 10749 } 10750 10751 /** 10752 * Cancels any animations for this view. 10753 */ 10754 public void clearAnimation() { 10755 if (mCurrentAnimation != null) { 10756 mCurrentAnimation.detach(); 10757 } 10758 mCurrentAnimation = null; 10759 invalidateParentIfNeeded(); 10760 } 10761 10762 /** 10763 * Sets the next animation to play for this view. 10764 * If you want the animation to play immediately, use 10765 * startAnimation. This method provides allows fine-grained 10766 * control over the start time and invalidation, but you 10767 * must make sure that 1) the animation has a start time set, and 10768 * 2) the view will be invalidated when the animation is supposed to 10769 * start. 10770 * 10771 * @param animation The next animation, or null. 10772 */ 10773 public void setAnimation(Animation animation) { 10774 mCurrentAnimation = animation; 10775 if (animation != null) { 10776 animation.reset(); 10777 } 10778 } 10779 10780 /** 10781 * Invoked by a parent ViewGroup to notify the start of the animation 10782 * currently associated with this view. If you override this method, 10783 * always call super.onAnimationStart(); 10784 * 10785 * @see #setAnimation(android.view.animation.Animation) 10786 * @see #getAnimation() 10787 */ 10788 protected void onAnimationStart() { 10789 mPrivateFlags |= ANIMATION_STARTED; 10790 } 10791 10792 /** 10793 * Invoked by a parent ViewGroup to notify the end of the animation 10794 * currently associated with this view. If you override this method, 10795 * always call super.onAnimationEnd(); 10796 * 10797 * @see #setAnimation(android.view.animation.Animation) 10798 * @see #getAnimation() 10799 */ 10800 protected void onAnimationEnd() { 10801 mPrivateFlags &= ~ANIMATION_STARTED; 10802 } 10803 10804 /** 10805 * Invoked if there is a Transform that involves alpha. Subclass that can 10806 * draw themselves with the specified alpha should return true, and then 10807 * respect that alpha when their onDraw() is called. If this returns false 10808 * then the view may be redirected to draw into an offscreen buffer to 10809 * fulfill the request, which will look fine, but may be slower than if the 10810 * subclass handles it internally. The default implementation returns false. 10811 * 10812 * @param alpha The alpha (0..255) to apply to the view's drawing 10813 * @return true if the view can draw with the specified alpha. 10814 */ 10815 protected boolean onSetAlpha(int alpha) { 10816 return false; 10817 } 10818 10819 /** 10820 * This is used by the RootView to perform an optimization when 10821 * the view hierarchy contains one or several SurfaceView. 10822 * SurfaceView is always considered transparent, but its children are not, 10823 * therefore all View objects remove themselves from the global transparent 10824 * region (passed as a parameter to this function). 10825 * 10826 * @param region The transparent region for this ViewRoot (window). 10827 * 10828 * @return Returns true if the effective visibility of the view at this 10829 * point is opaque, regardless of the transparent region; returns false 10830 * if it is possible for underlying windows to be seen behind the view. 10831 * 10832 * {@hide} 10833 */ 10834 public boolean gatherTransparentRegion(Region region) { 10835 final AttachInfo attachInfo = mAttachInfo; 10836 if (region != null && attachInfo != null) { 10837 final int pflags = mPrivateFlags; 10838 if ((pflags & SKIP_DRAW) == 0) { 10839 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 10840 // remove it from the transparent region. 10841 final int[] location = attachInfo.mTransparentLocation; 10842 getLocationInWindow(location); 10843 region.op(location[0], location[1], location[0] + mRight - mLeft, 10844 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 10845 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 10846 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 10847 // exists, so we remove the background drawable's non-transparent 10848 // parts from this transparent region. 10849 applyDrawableToTransparentRegion(mBGDrawable, region); 10850 } 10851 } 10852 return true; 10853 } 10854 10855 /** 10856 * Play a sound effect for this view. 10857 * 10858 * <p>The framework will play sound effects for some built in actions, such as 10859 * clicking, but you may wish to play these effects in your widget, 10860 * for instance, for internal navigation. 10861 * 10862 * <p>The sound effect will only be played if sound effects are enabled by the user, and 10863 * {@link #isSoundEffectsEnabled()} is true. 10864 * 10865 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 10866 */ 10867 public void playSoundEffect(int soundConstant) { 10868 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 10869 return; 10870 } 10871 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 10872 } 10873 10874 /** 10875 * BZZZTT!!1! 10876 * 10877 * <p>Provide haptic feedback to the user for this view. 10878 * 10879 * <p>The framework will provide haptic feedback for some built in actions, 10880 * such as long presses, but you may wish to provide feedback for your 10881 * own widget. 10882 * 10883 * <p>The feedback will only be performed if 10884 * {@link #isHapticFeedbackEnabled()} is true. 10885 * 10886 * @param feedbackConstant One of the constants defined in 10887 * {@link HapticFeedbackConstants} 10888 */ 10889 public boolean performHapticFeedback(int feedbackConstant) { 10890 return performHapticFeedback(feedbackConstant, 0); 10891 } 10892 10893 /** 10894 * BZZZTT!!1! 10895 * 10896 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 10897 * 10898 * @param feedbackConstant One of the constants defined in 10899 * {@link HapticFeedbackConstants} 10900 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 10901 */ 10902 public boolean performHapticFeedback(int feedbackConstant, int flags) { 10903 if (mAttachInfo == null) { 10904 return false; 10905 } 10906 //noinspection SimplifiableIfStatement 10907 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 10908 && !isHapticFeedbackEnabled()) { 10909 return false; 10910 } 10911 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 10912 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 10913 } 10914 10915 /** 10916 * Request that the visibility of the status bar be changed. 10917 */ 10918 public void setSystemUiVisibility(int visibility) { 10919 if (visibility != mSystemUiVisibility) { 10920 mSystemUiVisibility = visibility; 10921 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 10922 mParent.recomputeViewAttributes(this); 10923 } 10924 } 10925 } 10926 10927 /** 10928 * Returns the status bar visibility that this view has requested. 10929 */ 10930 public int getSystemUiVisibility() { 10931 return mSystemUiVisibility; 10932 } 10933 10934 public void setOnSystemUiVisibilityChangeListener(OnSystemUiVisibilityChangeListener l) { 10935 mOnSystemUiVisibilityChangeListener = l; 10936 if (mParent != null && mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 10937 mParent.recomputeViewAttributes(this); 10938 } 10939 } 10940 10941 /** 10942 */ 10943 public void dispatchSystemUiVisibilityChanged(int visibility) { 10944 if (mOnSystemUiVisibilityChangeListener != null) { 10945 mOnSystemUiVisibilityChangeListener.onSystemUiVisibilityChange( 10946 visibility & ~PUBLIC_STATUS_BAR_VISIBILITY_MASK); 10947 } 10948 } 10949 10950 /** 10951 * Creates an image that the system displays during the drag and drop 10952 * operation. This is called a "drag shadow". The default implementation 10953 * for a DragShadowBuilder based on a View returns an image that has exactly the same 10954 * appearance as the given View. The default also positions the center of the drag shadow 10955 * directly under the touch point. If no View is provided (the constructor with no parameters 10956 * is used), and {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} and 10957 * {@link #onDrawShadow(Canvas) onDrawShadow()} are not overriden, then the 10958 * default is an invisible drag shadow. 10959 * <p> 10960 * You are not required to use the View you provide to the constructor as the basis of the 10961 * drag shadow. The {@link #onDrawShadow(Canvas) onDrawShadow()} method allows you to draw 10962 * anything you want as the drag shadow. 10963 * </p> 10964 * <p> 10965 * You pass a DragShadowBuilder object to the system when you start the drag. The system 10966 * calls {@link #onProvideShadowMetrics(Point,Point) onProvideShadowMetrics()} to get the 10967 * size and position of the drag shadow. It uses this data to construct a 10968 * {@link android.graphics.Canvas} object, then it calls {@link #onDrawShadow(Canvas) onDrawShadow()} 10969 * so that your application can draw the shadow image in the Canvas. 10970 * </p> 10971 */ 10972 public static class DragShadowBuilder { 10973 private final WeakReference<View> mView; 10974 10975 /** 10976 * Constructs a shadow image builder based on a View. By default, the resulting drag 10977 * shadow will have the same appearance and dimensions as the View, with the touch point 10978 * over the center of the View. 10979 * @param view A View. Any View in scope can be used. 10980 */ 10981 public DragShadowBuilder(View view) { 10982 mView = new WeakReference<View>(view); 10983 } 10984 10985 /** 10986 * Construct a shadow builder object with no associated View. This 10987 * constructor variant is only useful when the {@link #onProvideShadowMetrics(Point, Point)} 10988 * and {@link #onDrawShadow(Canvas)} methods are also overridden in order 10989 * to supply the drag shadow's dimensions and appearance without 10990 * reference to any View object. If they are not overridden, then the result is an 10991 * invisible drag shadow. 10992 */ 10993 public DragShadowBuilder() { 10994 mView = new WeakReference<View>(null); 10995 } 10996 10997 /** 10998 * Returns the View object that had been passed to the 10999 * {@link #View.DragShadowBuilder(View)} 11000 * constructor. If that View parameter was {@code null} or if the 11001 * {@link #View.DragShadowBuilder()} 11002 * constructor was used to instantiate the builder object, this method will return 11003 * null. 11004 * 11005 * @return The View object associate with this builder object. 11006 */ 11007 final public View getView() { 11008 return mView.get(); 11009 } 11010 11011 /** 11012 * Provides the metrics for the shadow image. These include the dimensions of 11013 * the shadow image, and the point within that shadow that should 11014 * be centered under the touch location while dragging. 11015 * <p> 11016 * The default implementation sets the dimensions of the shadow to be the 11017 * same as the dimensions of the View itself and centers the shadow under 11018 * the touch point. 11019 * </p> 11020 * 11021 * @param shadowSize A {@link android.graphics.Point} containing the width and height 11022 * of the shadow image. Your application must set {@link android.graphics.Point#x} to the 11023 * desired width and must set {@link android.graphics.Point#y} to the desired height of the 11024 * image. 11025 * 11026 * @param shadowTouchPoint A {@link android.graphics.Point} for the position within the 11027 * shadow image that should be underneath the touch point during the drag and drop 11028 * operation. Your application must set {@link android.graphics.Point#x} to the 11029 * X coordinate and {@link android.graphics.Point#y} to the Y coordinate of this position. 11030 */ 11031 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 11032 final View view = mView.get(); 11033 if (view != null) { 11034 shadowSize.set(view.getWidth(), view.getHeight()); 11035 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 11036 } else { 11037 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 11038 } 11039 } 11040 11041 /** 11042 * Draws the shadow image. The system creates the {@link android.graphics.Canvas} object 11043 * based on the dimensions it received from the 11044 * {@link #onProvideShadowMetrics(Point, Point)} callback. 11045 * 11046 * @param canvas A {@link android.graphics.Canvas} object in which to draw the shadow image. 11047 */ 11048 public void onDrawShadow(Canvas canvas) { 11049 final View view = mView.get(); 11050 if (view != null) { 11051 view.draw(canvas); 11052 } else { 11053 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 11054 } 11055 } 11056 } 11057 11058 /** 11059 * Starts a drag and drop operation. When your application calls this method, it passes a 11060 * {@link android.view.View.DragShadowBuilder} object to the system. The 11061 * system calls this object's {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} 11062 * to get metrics for the drag shadow, and then calls the object's 11063 * {@link DragShadowBuilder#onDrawShadow(Canvas)} to draw the drag shadow itself. 11064 * <p> 11065 * Once the system has the drag shadow, it begins the drag and drop operation by sending 11066 * drag events to all the View objects in your application that are currently visible. It does 11067 * this either by calling the View object's drag listener (an implementation of 11068 * {@link android.view.View.OnDragListener#onDrag(View,DragEvent) onDrag()} or by calling the 11069 * View object's {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} method. 11070 * Both are passed a {@link android.view.DragEvent} object that has a 11071 * {@link android.view.DragEvent#getAction()} value of 11072 * {@link android.view.DragEvent#ACTION_DRAG_STARTED}. 11073 * </p> 11074 * <p> 11075 * Your application can invoke startDrag() on any attached View object. The View object does not 11076 * need to be the one used in {@link android.view.View.DragShadowBuilder}, nor does it need to 11077 * be related to the View the user selected for dragging. 11078 * </p> 11079 * @param data A {@link android.content.ClipData} object pointing to the data to be 11080 * transferred by the drag and drop operation. 11081 * @param shadowBuilder A {@link android.view.View.DragShadowBuilder} object for building the 11082 * drag shadow. 11083 * @param myLocalState An {@link java.lang.Object} containing local data about the drag and 11084 * drop operation. This Object is put into every DragEvent object sent by the system during the 11085 * current drag. 11086 * <p> 11087 * myLocalState is a lightweight mechanism for the sending information from the dragged View 11088 * to the target Views. For example, it can contain flags that differentiate between a 11089 * a copy operation and a move operation. 11090 * </p> 11091 * @param flags Flags that control the drag and drop operation. No flags are currently defined, 11092 * so the parameter should be set to 0. 11093 * @return {@code true} if the method completes successfully, or 11094 * {@code false} if it fails anywhere. Returning {@code false} means the system was unable to 11095 * do a drag, and so no drag operation is in progress. 11096 */ 11097 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 11098 Object myLocalState, int flags) { 11099 if (ViewDebug.DEBUG_DRAG) { 11100 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 11101 } 11102 boolean okay = false; 11103 11104 Point shadowSize = new Point(); 11105 Point shadowTouchPoint = new Point(); 11106 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 11107 11108 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 11109 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 11110 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 11111 } 11112 11113 if (ViewDebug.DEBUG_DRAG) { 11114 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 11115 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 11116 } 11117 Surface surface = new Surface(); 11118 try { 11119 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 11120 flags, shadowSize.x, shadowSize.y, surface); 11121 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 11122 + " surface=" + surface); 11123 if (token != null) { 11124 Canvas canvas = surface.lockCanvas(null); 11125 try { 11126 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 11127 shadowBuilder.onDrawShadow(canvas); 11128 } finally { 11129 surface.unlockCanvasAndPost(canvas); 11130 } 11131 11132 final ViewRoot root = getViewRoot(); 11133 11134 // Cache the local state object for delivery with DragEvents 11135 root.setLocalDragState(myLocalState); 11136 11137 // repurpose 'shadowSize' for the last touch point 11138 root.getLastTouchPoint(shadowSize); 11139 11140 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 11141 shadowSize.x, shadowSize.y, 11142 shadowTouchPoint.x, shadowTouchPoint.y, data); 11143 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 11144 } 11145 } catch (Exception e) { 11146 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 11147 surface.destroy(); 11148 } 11149 11150 return okay; 11151 } 11152 11153 /** 11154 * Handles drag events sent by the system following a call to 11155 * {@link android.view.View#startDrag(ClipData,DragShadowBuilder,Object,int) startDrag()}. 11156 *<p> 11157 * When the system calls this method, it passes a 11158 * {@link android.view.DragEvent} object. A call to 11159 * {@link android.view.DragEvent#getAction()} returns one of the action type constants defined 11160 * in DragEvent. The method uses these to determine what is happening in the drag and drop 11161 * operation. 11162 * @param event The {@link android.view.DragEvent} sent by the system. 11163 * The {@link android.view.DragEvent#getAction()} method returns an action type constant defined 11164 * in DragEvent, indicating the type of drag event represented by this object. 11165 * @return {@code true} if the method was successful, otherwise {@code false}. 11166 * <p> 11167 * The method should return {@code true} in response to an action type of 11168 * {@link android.view.DragEvent#ACTION_DRAG_STARTED} to receive drag events for the current 11169 * operation. 11170 * </p> 11171 * <p> 11172 * The method should also return {@code true} in response to an action type of 11173 * {@link android.view.DragEvent#ACTION_DROP} if it consumed the drop, or 11174 * {@code false} if it didn't. 11175 * </p> 11176 */ 11177 public boolean onDragEvent(DragEvent event) { 11178 return false; 11179 } 11180 11181 /** 11182 * Detects if this View is enabled and has a drag event listener. 11183 * If both are true, then it calls the drag event listener with the 11184 * {@link android.view.DragEvent} it received. If the drag event listener returns 11185 * {@code true}, then dispatchDragEvent() returns {@code true}. 11186 * <p> 11187 * For all other cases, the method calls the 11188 * {@link android.view.View#onDragEvent(DragEvent) onDragEvent()} drag event handler 11189 * method and returns its result. 11190 * </p> 11191 * <p> 11192 * This ensures that a drag event is always consumed, even if the View does not have a drag 11193 * event listener. However, if the View has a listener and the listener returns true, then 11194 * onDragEvent() is not called. 11195 * </p> 11196 */ 11197 public boolean dispatchDragEvent(DragEvent event) { 11198 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 11199 && mOnDragListener.onDrag(this, event)) { 11200 return true; 11201 } 11202 return onDragEvent(event); 11203 } 11204 11205 /** 11206 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 11207 * it is ever exposed at all. 11208 * @hide 11209 */ 11210 public void onCloseSystemDialogs(String reason) { 11211 } 11212 11213 /** 11214 * Given a Drawable whose bounds have been set to draw into this view, 11215 * update a Region being computed for {@link #gatherTransparentRegion} so 11216 * that any non-transparent parts of the Drawable are removed from the 11217 * given transparent region. 11218 * 11219 * @param dr The Drawable whose transparency is to be applied to the region. 11220 * @param region A Region holding the current transparency information, 11221 * where any parts of the region that are set are considered to be 11222 * transparent. On return, this region will be modified to have the 11223 * transparency information reduced by the corresponding parts of the 11224 * Drawable that are not transparent. 11225 * {@hide} 11226 */ 11227 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 11228 if (DBG) { 11229 Log.i("View", "Getting transparent region for: " + this); 11230 } 11231 final Region r = dr.getTransparentRegion(); 11232 final Rect db = dr.getBounds(); 11233 final AttachInfo attachInfo = mAttachInfo; 11234 if (r != null && attachInfo != null) { 11235 final int w = getRight()-getLeft(); 11236 final int h = getBottom()-getTop(); 11237 if (db.left > 0) { 11238 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 11239 r.op(0, 0, db.left, h, Region.Op.UNION); 11240 } 11241 if (db.right < w) { 11242 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 11243 r.op(db.right, 0, w, h, Region.Op.UNION); 11244 } 11245 if (db.top > 0) { 11246 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 11247 r.op(0, 0, w, db.top, Region.Op.UNION); 11248 } 11249 if (db.bottom < h) { 11250 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 11251 r.op(0, db.bottom, w, h, Region.Op.UNION); 11252 } 11253 final int[] location = attachInfo.mTransparentLocation; 11254 getLocationInWindow(location); 11255 r.translate(location[0], location[1]); 11256 region.op(r, Region.Op.INTERSECT); 11257 } else { 11258 region.op(db, Region.Op.DIFFERENCE); 11259 } 11260 } 11261 11262 private void postCheckForLongClick(int delayOffset) { 11263 mHasPerformedLongPress = false; 11264 11265 if (mPendingCheckForLongPress == null) { 11266 mPendingCheckForLongPress = new CheckForLongPress(); 11267 } 11268 mPendingCheckForLongPress.rememberWindowAttachCount(); 11269 postDelayed(mPendingCheckForLongPress, 11270 ViewConfiguration.getLongPressTimeout() - delayOffset); 11271 } 11272 11273 /** 11274 * Inflate a view from an XML resource. This convenience method wraps the {@link 11275 * LayoutInflater} class, which provides a full range of options for view inflation. 11276 * 11277 * @param context The Context object for your activity or application. 11278 * @param resource The resource ID to inflate 11279 * @param root A view group that will be the parent. Used to properly inflate the 11280 * layout_* parameters. 11281 * @see LayoutInflater 11282 */ 11283 public static View inflate(Context context, int resource, ViewGroup root) { 11284 LayoutInflater factory = LayoutInflater.from(context); 11285 return factory.inflate(resource, root); 11286 } 11287 11288 /** 11289 * Scroll the view with standard behavior for scrolling beyond the normal 11290 * content boundaries. Views that call this method should override 11291 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 11292 * results of an over-scroll operation. 11293 * 11294 * Views can use this method to handle any touch or fling-based scrolling. 11295 * 11296 * @param deltaX Change in X in pixels 11297 * @param deltaY Change in Y in pixels 11298 * @param scrollX Current X scroll value in pixels before applying deltaX 11299 * @param scrollY Current Y scroll value in pixels before applying deltaY 11300 * @param scrollRangeX Maximum content scroll range along the X axis 11301 * @param scrollRangeY Maximum content scroll range along the Y axis 11302 * @param maxOverScrollX Number of pixels to overscroll by in either direction 11303 * along the X axis. 11304 * @param maxOverScrollY Number of pixels to overscroll by in either direction 11305 * along the Y axis. 11306 * @param isTouchEvent true if this scroll operation is the result of a touch event. 11307 * @return true if scrolling was clamped to an over-scroll boundary along either 11308 * axis, false otherwise. 11309 */ 11310 protected boolean overScrollBy(int deltaX, int deltaY, 11311 int scrollX, int scrollY, 11312 int scrollRangeX, int scrollRangeY, 11313 int maxOverScrollX, int maxOverScrollY, 11314 boolean isTouchEvent) { 11315 final int overScrollMode = mOverScrollMode; 11316 final boolean canScrollHorizontal = 11317 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 11318 final boolean canScrollVertical = 11319 computeVerticalScrollRange() > computeVerticalScrollExtent(); 11320 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 11321 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 11322 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 11323 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 11324 11325 int newScrollX = scrollX + deltaX; 11326 if (!overScrollHorizontal) { 11327 maxOverScrollX = 0; 11328 } 11329 11330 int newScrollY = scrollY + deltaY; 11331 if (!overScrollVertical) { 11332 maxOverScrollY = 0; 11333 } 11334 11335 // Clamp values if at the limits and record 11336 final int left = -maxOverScrollX; 11337 final int right = maxOverScrollX + scrollRangeX; 11338 final int top = -maxOverScrollY; 11339 final int bottom = maxOverScrollY + scrollRangeY; 11340 11341 boolean clampedX = false; 11342 if (newScrollX > right) { 11343 newScrollX = right; 11344 clampedX = true; 11345 } else if (newScrollX < left) { 11346 newScrollX = left; 11347 clampedX = true; 11348 } 11349 11350 boolean clampedY = false; 11351 if (newScrollY > bottom) { 11352 newScrollY = bottom; 11353 clampedY = true; 11354 } else if (newScrollY < top) { 11355 newScrollY = top; 11356 clampedY = true; 11357 } 11358 11359 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 11360 11361 return clampedX || clampedY; 11362 } 11363 11364 /** 11365 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 11366 * respond to the results of an over-scroll operation. 11367 * 11368 * @param scrollX New X scroll value in pixels 11369 * @param scrollY New Y scroll value in pixels 11370 * @param clampedX True if scrollX was clamped to an over-scroll boundary 11371 * @param clampedY True if scrollY was clamped to an over-scroll boundary 11372 */ 11373 protected void onOverScrolled(int scrollX, int scrollY, 11374 boolean clampedX, boolean clampedY) { 11375 // Intentionally empty. 11376 } 11377 11378 /** 11379 * Returns the over-scroll mode for this view. The result will be 11380 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11381 * (allow over-scrolling only if the view content is larger than the container), 11382 * or {@link #OVER_SCROLL_NEVER}. 11383 * 11384 * @return This view's over-scroll mode. 11385 */ 11386 public int getOverScrollMode() { 11387 return mOverScrollMode; 11388 } 11389 11390 /** 11391 * Set the over-scroll mode for this view. Valid over-scroll modes are 11392 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 11393 * (allow over-scrolling only if the view content is larger than the container), 11394 * or {@link #OVER_SCROLL_NEVER}. 11395 * 11396 * Setting the over-scroll mode of a view will have an effect only if the 11397 * view is capable of scrolling. 11398 * 11399 * @param overScrollMode The new over-scroll mode for this view. 11400 */ 11401 public void setOverScrollMode(int overScrollMode) { 11402 if (overScrollMode != OVER_SCROLL_ALWAYS && 11403 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 11404 overScrollMode != OVER_SCROLL_NEVER) { 11405 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 11406 } 11407 mOverScrollMode = overScrollMode; 11408 } 11409 11410 /** 11411 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 11412 * Each MeasureSpec represents a requirement for either the width or the height. 11413 * A MeasureSpec is comprised of a size and a mode. There are three possible 11414 * modes: 11415 * <dl> 11416 * <dt>UNSPECIFIED</dt> 11417 * <dd> 11418 * The parent has not imposed any constraint on the child. It can be whatever size 11419 * it wants. 11420 * </dd> 11421 * 11422 * <dt>EXACTLY</dt> 11423 * <dd> 11424 * The parent has determined an exact size for the child. The child is going to be 11425 * given those bounds regardless of how big it wants to be. 11426 * </dd> 11427 * 11428 * <dt>AT_MOST</dt> 11429 * <dd> 11430 * The child can be as large as it wants up to the specified size. 11431 * </dd> 11432 * </dl> 11433 * 11434 * MeasureSpecs are implemented as ints to reduce object allocation. This class 11435 * is provided to pack and unpack the <size, mode> tuple into the int. 11436 */ 11437 public static class MeasureSpec { 11438 private static final int MODE_SHIFT = 30; 11439 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 11440 11441 /** 11442 * Measure specification mode: The parent has not imposed any constraint 11443 * on the child. It can be whatever size it wants. 11444 */ 11445 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 11446 11447 /** 11448 * Measure specification mode: The parent has determined an exact size 11449 * for the child. The child is going to be given those bounds regardless 11450 * of how big it wants to be. 11451 */ 11452 public static final int EXACTLY = 1 << MODE_SHIFT; 11453 11454 /** 11455 * Measure specification mode: The child can be as large as it wants up 11456 * to the specified size. 11457 */ 11458 public static final int AT_MOST = 2 << MODE_SHIFT; 11459 11460 /** 11461 * Creates a measure specification based on the supplied size and mode. 11462 * 11463 * The mode must always be one of the following: 11464 * <ul> 11465 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 11466 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 11467 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 11468 * </ul> 11469 * 11470 * @param size the size of the measure specification 11471 * @param mode the mode of the measure specification 11472 * @return the measure specification based on size and mode 11473 */ 11474 public static int makeMeasureSpec(int size, int mode) { 11475 return size + mode; 11476 } 11477 11478 /** 11479 * Extracts the mode from the supplied measure specification. 11480 * 11481 * @param measureSpec the measure specification to extract the mode from 11482 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 11483 * {@link android.view.View.MeasureSpec#AT_MOST} or 11484 * {@link android.view.View.MeasureSpec#EXACTLY} 11485 */ 11486 public static int getMode(int measureSpec) { 11487 return (measureSpec & MODE_MASK); 11488 } 11489 11490 /** 11491 * Extracts the size from the supplied measure specification. 11492 * 11493 * @param measureSpec the measure specification to extract the size from 11494 * @return the size in pixels defined in the supplied measure specification 11495 */ 11496 public static int getSize(int measureSpec) { 11497 return (measureSpec & ~MODE_MASK); 11498 } 11499 11500 /** 11501 * Returns a String representation of the specified measure 11502 * specification. 11503 * 11504 * @param measureSpec the measure specification to convert to a String 11505 * @return a String with the following format: "MeasureSpec: MODE SIZE" 11506 */ 11507 public static String toString(int measureSpec) { 11508 int mode = getMode(measureSpec); 11509 int size = getSize(measureSpec); 11510 11511 StringBuilder sb = new StringBuilder("MeasureSpec: "); 11512 11513 if (mode == UNSPECIFIED) 11514 sb.append("UNSPECIFIED "); 11515 else if (mode == EXACTLY) 11516 sb.append("EXACTLY "); 11517 else if (mode == AT_MOST) 11518 sb.append("AT_MOST "); 11519 else 11520 sb.append(mode).append(" "); 11521 11522 sb.append(size); 11523 return sb.toString(); 11524 } 11525 } 11526 11527 class CheckForLongPress implements Runnable { 11528 11529 private int mOriginalWindowAttachCount; 11530 11531 public void run() { 11532 if (isPressed() && (mParent != null) 11533 && mOriginalWindowAttachCount == mWindowAttachCount) { 11534 if (performLongClick()) { 11535 mHasPerformedLongPress = true; 11536 } 11537 } 11538 } 11539 11540 public void rememberWindowAttachCount() { 11541 mOriginalWindowAttachCount = mWindowAttachCount; 11542 } 11543 } 11544 11545 private final class CheckForTap implements Runnable { 11546 public void run() { 11547 mPrivateFlags &= ~PREPRESSED; 11548 mPrivateFlags |= PRESSED; 11549 refreshDrawableState(); 11550 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 11551 postCheckForLongClick(ViewConfiguration.getTapTimeout()); 11552 } 11553 } 11554 } 11555 11556 private final class PerformClick implements Runnable { 11557 public void run() { 11558 performClick(); 11559 } 11560 } 11561 11562 /** @hide */ 11563 public void hackTurnOffWindowResizeAnim(boolean off) { 11564 mAttachInfo.mTurnOffWindowResizeAnim = off; 11565 } 11566 11567 /** 11568 * Interface definition for a callback to be invoked when a key event is 11569 * dispatched to this view. The callback will be invoked before the key 11570 * event is given to the view. 11571 */ 11572 public interface OnKeyListener { 11573 /** 11574 * Called when a key is dispatched to a view. This allows listeners to 11575 * get a chance to respond before the target view. 11576 * 11577 * @param v The view the key has been dispatched to. 11578 * @param keyCode The code for the physical key that was pressed 11579 * @param event The KeyEvent object containing full information about 11580 * the event. 11581 * @return True if the listener has consumed the event, false otherwise. 11582 */ 11583 boolean onKey(View v, int keyCode, KeyEvent event); 11584 } 11585 11586 /** 11587 * Interface definition for a callback to be invoked when a touch event is 11588 * dispatched to this view. The callback will be invoked before the touch 11589 * event is given to the view. 11590 */ 11591 public interface OnTouchListener { 11592 /** 11593 * Called when a touch event is dispatched to a view. This allows listeners to 11594 * get a chance to respond before the target view. 11595 * 11596 * @param v The view the touch event has been dispatched to. 11597 * @param event The MotionEvent object containing full information about 11598 * the event. 11599 * @return True if the listener has consumed the event, false otherwise. 11600 */ 11601 boolean onTouch(View v, MotionEvent event); 11602 } 11603 11604 /** 11605 * Interface definition for a callback to be invoked when a view has been clicked and held. 11606 */ 11607 public interface OnLongClickListener { 11608 /** 11609 * Called when a view has been clicked and held. 11610 * 11611 * @param v The view that was clicked and held. 11612 * 11613 * @return true if the callback consumed the long click, false otherwise. 11614 */ 11615 boolean onLongClick(View v); 11616 } 11617 11618 /** 11619 * Interface definition for a callback to be invoked when a drag is being dispatched 11620 * to this view. The callback will be invoked before the hosting view's own 11621 * onDrag(event) method. If the listener wants to fall back to the hosting view's 11622 * onDrag(event) behavior, it should return 'false' from this callback. 11623 */ 11624 public interface OnDragListener { 11625 /** 11626 * Called when a drag event is dispatched to a view. This allows listeners 11627 * to get a chance to override base View behavior. 11628 * 11629 * @param v The View that received the drag event. 11630 * @param event The {@link android.view.DragEvent} object for the drag event. 11631 * @return {@code true} if the drag event was handled successfully, or {@code false} 11632 * if the drag event was not handled. Note that {@code false} will trigger the View 11633 * to call its {@link #onDragEvent(DragEvent) onDragEvent()} handler. 11634 */ 11635 boolean onDrag(View v, DragEvent event); 11636 } 11637 11638 /** 11639 * Interface definition for a callback to be invoked when the focus state of 11640 * a view changed. 11641 */ 11642 public interface OnFocusChangeListener { 11643 /** 11644 * Called when the focus state of a view has changed. 11645 * 11646 * @param v The view whose state has changed. 11647 * @param hasFocus The new focus state of v. 11648 */ 11649 void onFocusChange(View v, boolean hasFocus); 11650 } 11651 11652 /** 11653 * Interface definition for a callback to be invoked when a view is clicked. 11654 */ 11655 public interface OnClickListener { 11656 /** 11657 * Called when a view has been clicked. 11658 * 11659 * @param v The view that was clicked. 11660 */ 11661 void onClick(View v); 11662 } 11663 11664 /** 11665 * Interface definition for a callback to be invoked when the context menu 11666 * for this view is being built. 11667 */ 11668 public interface OnCreateContextMenuListener { 11669 /** 11670 * Called when the context menu for this view is being built. It is not 11671 * safe to hold onto the menu after this method returns. 11672 * 11673 * @param menu The context menu that is being built 11674 * @param v The view for which the context menu is being built 11675 * @param menuInfo Extra information about the item for which the 11676 * context menu should be shown. This information will vary 11677 * depending on the class of v. 11678 */ 11679 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 11680 } 11681 11682 /** 11683 * Interface definition for a callback to be invoked when the status bar changes 11684 * visibility. 11685 * 11686 * @see #setOnSystemUiVisibilityChangeListener 11687 */ 11688 public interface OnSystemUiVisibilityChangeListener { 11689 /** 11690 * Called when the status bar changes visibility because of a call to 11691 * {@link #setSystemUiVisibility}. 11692 * 11693 * @param visibility {@link #STATUS_BAR_VISIBLE} or {@link #STATUS_BAR_HIDDEN}. 11694 */ 11695 public void onSystemUiVisibilityChange(int visibility); 11696 } 11697 11698 private final class UnsetPressedState implements Runnable { 11699 public void run() { 11700 setPressed(false); 11701 } 11702 } 11703 11704 /** 11705 * Base class for derived classes that want to save and restore their own 11706 * state in {@link android.view.View#onSaveInstanceState()}. 11707 */ 11708 public static class BaseSavedState extends AbsSavedState { 11709 /** 11710 * Constructor used when reading from a parcel. Reads the state of the superclass. 11711 * 11712 * @param source 11713 */ 11714 public BaseSavedState(Parcel source) { 11715 super(source); 11716 } 11717 11718 /** 11719 * Constructor called by derived classes when creating their SavedState objects 11720 * 11721 * @param superState The state of the superclass of this view 11722 */ 11723 public BaseSavedState(Parcelable superState) { 11724 super(superState); 11725 } 11726 11727 public static final Parcelable.Creator<BaseSavedState> CREATOR = 11728 new Parcelable.Creator<BaseSavedState>() { 11729 public BaseSavedState createFromParcel(Parcel in) { 11730 return new BaseSavedState(in); 11731 } 11732 11733 public BaseSavedState[] newArray(int size) { 11734 return new BaseSavedState[size]; 11735 } 11736 }; 11737 } 11738 11739 /** 11740 * A set of information given to a view when it is attached to its parent 11741 * window. 11742 */ 11743 static class AttachInfo { 11744 interface Callbacks { 11745 void playSoundEffect(int effectId); 11746 boolean performHapticFeedback(int effectId, boolean always); 11747 } 11748 11749 /** 11750 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 11751 * to a Handler. This class contains the target (View) to invalidate and 11752 * the coordinates of the dirty rectangle. 11753 * 11754 * For performance purposes, this class also implements a pool of up to 11755 * POOL_LIMIT objects that get reused. This reduces memory allocations 11756 * whenever possible. 11757 */ 11758 static class InvalidateInfo implements Poolable<InvalidateInfo> { 11759 private static final int POOL_LIMIT = 10; 11760 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 11761 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 11762 public InvalidateInfo newInstance() { 11763 return new InvalidateInfo(); 11764 } 11765 11766 public void onAcquired(InvalidateInfo element) { 11767 } 11768 11769 public void onReleased(InvalidateInfo element) { 11770 } 11771 }, POOL_LIMIT) 11772 ); 11773 11774 private InvalidateInfo mNext; 11775 11776 View target; 11777 11778 int left; 11779 int top; 11780 int right; 11781 int bottom; 11782 11783 public void setNextPoolable(InvalidateInfo element) { 11784 mNext = element; 11785 } 11786 11787 public InvalidateInfo getNextPoolable() { 11788 return mNext; 11789 } 11790 11791 static InvalidateInfo acquire() { 11792 return sPool.acquire(); 11793 } 11794 11795 void release() { 11796 sPool.release(this); 11797 } 11798 } 11799 11800 final IWindowSession mSession; 11801 11802 final IWindow mWindow; 11803 11804 final IBinder mWindowToken; 11805 11806 final Callbacks mRootCallbacks; 11807 11808 Canvas mHardwareCanvas; 11809 11810 /** 11811 * The top view of the hierarchy. 11812 */ 11813 View mRootView; 11814 11815 IBinder mPanelParentWindowToken; 11816 Surface mSurface; 11817 11818 boolean mHardwareAccelerated; 11819 boolean mHardwareAccelerationRequested; 11820 HardwareRenderer mHardwareRenderer; 11821 11822 /** 11823 * Scale factor used by the compatibility mode 11824 */ 11825 float mApplicationScale; 11826 11827 /** 11828 * Indicates whether the application is in compatibility mode 11829 */ 11830 boolean mScalingRequired; 11831 11832 /** 11833 * If set, ViewRoot doesn't use its lame animation for when the window resizes. 11834 */ 11835 boolean mTurnOffWindowResizeAnim; 11836 11837 /** 11838 * Left position of this view's window 11839 */ 11840 int mWindowLeft; 11841 11842 /** 11843 * Top position of this view's window 11844 */ 11845 int mWindowTop; 11846 11847 /** 11848 * Indicates whether views need to use 32-bit drawing caches 11849 */ 11850 boolean mUse32BitDrawingCache; 11851 11852 /** 11853 * For windows that are full-screen but using insets to layout inside 11854 * of the screen decorations, these are the current insets for the 11855 * content of the window. 11856 */ 11857 final Rect mContentInsets = new Rect(); 11858 11859 /** 11860 * For windows that are full-screen but using insets to layout inside 11861 * of the screen decorations, these are the current insets for the 11862 * actual visible parts of the window. 11863 */ 11864 final Rect mVisibleInsets = new Rect(); 11865 11866 /** 11867 * The internal insets given by this window. This value is 11868 * supplied by the client (through 11869 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 11870 * be given to the window manager when changed to be used in laying 11871 * out windows behind it. 11872 */ 11873 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 11874 = new ViewTreeObserver.InternalInsetsInfo(); 11875 11876 /** 11877 * All views in the window's hierarchy that serve as scroll containers, 11878 * used to determine if the window can be resized or must be panned 11879 * to adjust for a soft input area. 11880 */ 11881 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 11882 11883 final KeyEvent.DispatcherState mKeyDispatchState 11884 = new KeyEvent.DispatcherState(); 11885 11886 /** 11887 * Indicates whether the view's window currently has the focus. 11888 */ 11889 boolean mHasWindowFocus; 11890 11891 /** 11892 * The current visibility of the window. 11893 */ 11894 int mWindowVisibility; 11895 11896 /** 11897 * Indicates the time at which drawing started to occur. 11898 */ 11899 long mDrawingTime; 11900 11901 /** 11902 * Indicates whether or not ignoring the DIRTY_MASK flags. 11903 */ 11904 boolean mIgnoreDirtyState; 11905 11906 /** 11907 * Indicates whether the view's window is currently in touch mode. 11908 */ 11909 boolean mInTouchMode; 11910 11911 /** 11912 * Indicates that ViewRoot should trigger a global layout change 11913 * the next time it performs a traversal 11914 */ 11915 boolean mRecomputeGlobalAttributes; 11916 11917 /** 11918 * Set during a traveral if any views want to keep the screen on. 11919 */ 11920 boolean mKeepScreenOn; 11921 11922 /** 11923 * Bitwise-or of all of the values that views have passed to setSystemUiVisibility(). 11924 */ 11925 int mSystemUiVisibility; 11926 11927 /** 11928 * True if a view in this hierarchy has an OnSystemUiVisibilityChangeListener 11929 * attached. 11930 */ 11931 boolean mHasSystemUiListeners; 11932 11933 /** 11934 * Set if the visibility of any views has changed. 11935 */ 11936 boolean mViewVisibilityChanged; 11937 11938 /** 11939 * Set to true if a view has been scrolled. 11940 */ 11941 boolean mViewScrollChanged; 11942 11943 /** 11944 * Global to the view hierarchy used as a temporary for dealing with 11945 * x/y points in the transparent region computations. 11946 */ 11947 final int[] mTransparentLocation = new int[2]; 11948 11949 /** 11950 * Global to the view hierarchy used as a temporary for dealing with 11951 * x/y points in the ViewGroup.invalidateChild implementation. 11952 */ 11953 final int[] mInvalidateChildLocation = new int[2]; 11954 11955 11956 /** 11957 * Global to the view hierarchy used as a temporary for dealing with 11958 * x/y location when view is transformed. 11959 */ 11960 final float[] mTmpTransformLocation = new float[2]; 11961 11962 /** 11963 * The view tree observer used to dispatch global events like 11964 * layout, pre-draw, touch mode change, etc. 11965 */ 11966 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 11967 11968 /** 11969 * A Canvas used by the view hierarchy to perform bitmap caching. 11970 */ 11971 Canvas mCanvas; 11972 11973 /** 11974 * A Handler supplied by a view's {@link android.view.ViewRoot}. This 11975 * handler can be used to pump events in the UI events queue. 11976 */ 11977 final Handler mHandler; 11978 11979 /** 11980 * Identifier for messages requesting the view to be invalidated. 11981 * Such messages should be sent to {@link #mHandler}. 11982 */ 11983 static final int INVALIDATE_MSG = 0x1; 11984 11985 /** 11986 * Identifier for messages requesting the view to invalidate a region. 11987 * Such messages should be sent to {@link #mHandler}. 11988 */ 11989 static final int INVALIDATE_RECT_MSG = 0x2; 11990 11991 /** 11992 * Temporary for use in computing invalidate rectangles while 11993 * calling up the hierarchy. 11994 */ 11995 final Rect mTmpInvalRect = new Rect(); 11996 11997 /** 11998 * Temporary for use in computing hit areas with transformed views 11999 */ 12000 final RectF mTmpTransformRect = new RectF(); 12001 12002 /** 12003 * Temporary list for use in collecting focusable descendents of a view. 12004 */ 12005 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 12006 12007 /** 12008 * Creates a new set of attachment information with the specified 12009 * events handler and thread. 12010 * 12011 * @param handler the events handler the view must use 12012 */ 12013 AttachInfo(IWindowSession session, IWindow window, 12014 Handler handler, Callbacks effectPlayer) { 12015 mSession = session; 12016 mWindow = window; 12017 mWindowToken = window.asBinder(); 12018 mHandler = handler; 12019 mRootCallbacks = effectPlayer; 12020 } 12021 } 12022 12023 /** 12024 * <p>ScrollabilityCache holds various fields used by a View when scrolling 12025 * is supported. This avoids keeping too many unused fields in most 12026 * instances of View.</p> 12027 */ 12028 private static class ScrollabilityCache implements Runnable { 12029 12030 /** 12031 * Scrollbars are not visible 12032 */ 12033 public static final int OFF = 0; 12034 12035 /** 12036 * Scrollbars are visible 12037 */ 12038 public static final int ON = 1; 12039 12040 /** 12041 * Scrollbars are fading away 12042 */ 12043 public static final int FADING = 2; 12044 12045 public boolean fadeScrollBars; 12046 12047 public int fadingEdgeLength; 12048 public int scrollBarDefaultDelayBeforeFade; 12049 public int scrollBarFadeDuration; 12050 12051 public int scrollBarSize; 12052 public ScrollBarDrawable scrollBar; 12053 public float[] interpolatorValues; 12054 public View host; 12055 12056 public final Paint paint; 12057 public final Matrix matrix; 12058 public Shader shader; 12059 12060 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 12061 12062 private static final float[] OPAQUE = { 255 }; 12063 private static final float[] TRANSPARENT = { 0.0f }; 12064 12065 /** 12066 * When fading should start. This time moves into the future every time 12067 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 12068 */ 12069 public long fadeStartTime; 12070 12071 12072 /** 12073 * The current state of the scrollbars: ON, OFF, or FADING 12074 */ 12075 public int state = OFF; 12076 12077 private int mLastColor; 12078 12079 public ScrollabilityCache(ViewConfiguration configuration, View host) { 12080 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 12081 scrollBarSize = configuration.getScaledScrollBarSize(); 12082 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 12083 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 12084 12085 paint = new Paint(); 12086 matrix = new Matrix(); 12087 // use use a height of 1, and then wack the matrix each time we 12088 // actually use it. 12089 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 12090 12091 paint.setShader(shader); 12092 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 12093 this.host = host; 12094 } 12095 12096 public void setFadeColor(int color) { 12097 if (color != 0 && color != mLastColor) { 12098 mLastColor = color; 12099 color |= 0xFF000000; 12100 12101 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 12102 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 12103 12104 paint.setShader(shader); 12105 // Restore the default transfer mode (src_over) 12106 paint.setXfermode(null); 12107 } 12108 } 12109 12110 public void run() { 12111 long now = AnimationUtils.currentAnimationTimeMillis(); 12112 if (now >= fadeStartTime) { 12113 12114 // the animation fades the scrollbars out by changing 12115 // the opacity (alpha) from fully opaque to fully 12116 // transparent 12117 int nextFrame = (int) now; 12118 int framesCount = 0; 12119 12120 Interpolator interpolator = scrollBarInterpolator; 12121 12122 // Start opaque 12123 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 12124 12125 // End transparent 12126 nextFrame += scrollBarFadeDuration; 12127 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 12128 12129 state = FADING; 12130 12131 // Kick off the fade animation 12132 host.invalidate(true); 12133 } 12134 } 12135 12136 } 12137} 12138