View.java revision a53146c5569f8ff5f7eb55e9ad35d23ddacf2add
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.content.ClipData; 20import android.content.ClipDescription; 21import android.content.Context; 22import android.content.res.Configuration; 23import android.content.res.Resources; 24import android.content.res.TypedArray; 25import android.graphics.Bitmap; 26import android.graphics.Camera; 27import android.graphics.Canvas; 28import android.graphics.Interpolator; 29import android.graphics.LinearGradient; 30import android.graphics.Matrix; 31import android.graphics.Paint; 32import android.graphics.PixelFormat; 33import android.graphics.Point; 34import android.graphics.PorterDuff; 35import android.graphics.PorterDuffXfermode; 36import android.graphics.Rect; 37import android.graphics.RectF; 38import android.graphics.Region; 39import android.graphics.Shader; 40import android.graphics.drawable.ColorDrawable; 41import android.graphics.drawable.Drawable; 42import android.os.Handler; 43import android.os.IBinder; 44import android.os.Message; 45import android.os.Parcel; 46import android.os.Parcelable; 47import android.os.RemoteException; 48import android.os.SystemClock; 49import android.os.SystemProperties; 50import android.util.AttributeSet; 51import android.util.Log; 52import android.util.Pool; 53import android.util.Poolable; 54import android.util.PoolableManager; 55import android.util.Pools; 56import android.util.SparseArray; 57import android.view.ContextMenu.ContextMenuInfo; 58import android.view.DragEvent; 59import android.view.accessibility.AccessibilityEvent; 60import android.view.accessibility.AccessibilityEventSource; 61import android.view.accessibility.AccessibilityManager; 62import android.view.animation.Animation; 63import android.view.animation.AnimationUtils; 64import android.view.inputmethod.EditorInfo; 65import android.view.inputmethod.InputConnection; 66import android.view.inputmethod.InputMethodManager; 67import android.widget.ScrollBarDrawable; 68import com.android.internal.R; 69import com.android.internal.view.menu.MenuBuilder; 70 71import java.lang.reflect.InvocationTargetException; 72import java.lang.reflect.Method; 73import java.util.ArrayList; 74import java.util.Arrays; 75import java.util.List; 76import java.util.WeakHashMap; 77 78/** 79 * <p> 80 * This class represents the basic building block for user interface components. A View 81 * occupies a rectangular area on the screen and is responsible for drawing and 82 * event handling. View is the base class for <em>widgets</em>, which are 83 * used to create interactive UI components (buttons, text fields, etc.). The 84 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 85 * are invisible containers that hold other Views (or other ViewGroups) and define 86 * their layout properties. 87 * </p> 88 * 89 * <div class="special"> 90 * <p>For an introduction to using this class to develop your 91 * application's user interface, read the Developer Guide documentation on 92 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 93 * include: 94 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 95 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 96 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 97 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 98 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 99 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 100 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 102 * </p> 103 * </div> 104 * 105 * <a name="Using"></a> 106 * <h3>Using Views</h3> 107 * <p> 108 * All of the views in a window are arranged in a single tree. You can add views 109 * either from code or by specifying a tree of views in one or more XML layout 110 * files. There are many specialized subclasses of views that act as controls or 111 * are capable of displaying text, images, or other content. 112 * </p> 113 * <p> 114 * Once you have created a tree of views, there are typically a few types of 115 * common operations you may wish to perform: 116 * <ul> 117 * <li><strong>Set properties:</strong> for example setting the text of a 118 * {@link android.widget.TextView}. The available properties and the methods 119 * that set them will vary among the different subclasses of views. Note that 120 * properties that are known at build time can be set in the XML layout 121 * files.</li> 122 * <li><strong>Set focus:</strong> The framework will handled moving focus in 123 * response to user input. To force focus to a specific view, call 124 * {@link #requestFocus}.</li> 125 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 126 * that will be notified when something interesting happens to the view. For 127 * example, all views will let you set a listener to be notified when the view 128 * gains or loses focus. You can register such a listener using 129 * {@link #setOnFocusChangeListener}. Other view subclasses offer more 130 * specialized listeners. For example, a Button exposes a listener to notify 131 * clients when the button is clicked.</li> 132 * <li><strong>Set visibility:</strong> You can hide or show views using 133 * {@link #setVisibility}.</li> 134 * </ul> 135 * </p> 136 * <p><em> 137 * Note: The Android framework is responsible for measuring, laying out and 138 * drawing views. You should not call methods that perform these actions on 139 * views yourself unless you are actually implementing a 140 * {@link android.view.ViewGroup}. 141 * </em></p> 142 * 143 * <a name="Lifecycle"></a> 144 * <h3>Implementing a Custom View</h3> 145 * 146 * <p> 147 * To implement a custom view, you will usually begin by providing overrides for 148 * some of the standard methods that the framework calls on all views. You do 149 * not need to override all of these methods. In fact, you can start by just 150 * overriding {@link #onDraw(android.graphics.Canvas)}. 151 * <table border="2" width="85%" align="center" cellpadding="5"> 152 * <thead> 153 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 154 * </thead> 155 * 156 * <tbody> 157 * <tr> 158 * <td rowspan="2">Creation</td> 159 * <td>Constructors</td> 160 * <td>There is a form of the constructor that are called when the view 161 * is created from code and a form that is called when the view is 162 * inflated from a layout file. The second form should parse and apply 163 * any attributes defined in the layout file. 164 * </td> 165 * </tr> 166 * <tr> 167 * <td><code>{@link #onFinishInflate()}</code></td> 168 * <td>Called after a view and all of its children has been inflated 169 * from XML.</td> 170 * </tr> 171 * 172 * <tr> 173 * <td rowspan="3">Layout</td> 174 * <td><code>{@link #onMeasure}</code></td> 175 * <td>Called to determine the size requirements for this view and all 176 * of its children. 177 * </td> 178 * </tr> 179 * <tr> 180 * <td><code>{@link #onLayout}</code></td> 181 * <td>Called when this view should assign a size and position to all 182 * of its children. 183 * </td> 184 * </tr> 185 * <tr> 186 * <td><code>{@link #onSizeChanged}</code></td> 187 * <td>Called when the size of this view has changed. 188 * </td> 189 * </tr> 190 * 191 * <tr> 192 * <td>Drawing</td> 193 * <td><code>{@link #onDraw}</code></td> 194 * <td>Called when the view should render its content. 195 * </td> 196 * </tr> 197 * 198 * <tr> 199 * <td rowspan="4">Event processing</td> 200 * <td><code>{@link #onKeyDown}</code></td> 201 * <td>Called when a new key event occurs. 202 * </td> 203 * </tr> 204 * <tr> 205 * <td><code>{@link #onKeyUp}</code></td> 206 * <td>Called when a key up event occurs. 207 * </td> 208 * </tr> 209 * <tr> 210 * <td><code>{@link #onTrackballEvent}</code></td> 211 * <td>Called when a trackball motion event occurs. 212 * </td> 213 * </tr> 214 * <tr> 215 * <td><code>{@link #onTouchEvent}</code></td> 216 * <td>Called when a touch screen motion event occurs. 217 * </td> 218 * </tr> 219 * 220 * <tr> 221 * <td rowspan="2">Focus</td> 222 * <td><code>{@link #onFocusChanged}</code></td> 223 * <td>Called when the view gains or loses focus. 224 * </td> 225 * </tr> 226 * 227 * <tr> 228 * <td><code>{@link #onWindowFocusChanged}</code></td> 229 * <td>Called when the window containing the view gains or loses focus. 230 * </td> 231 * </tr> 232 * 233 * <tr> 234 * <td rowspan="3">Attaching</td> 235 * <td><code>{@link #onAttachedToWindow()}</code></td> 236 * <td>Called when the view is attached to a window. 237 * </td> 238 * </tr> 239 * 240 * <tr> 241 * <td><code>{@link #onDetachedFromWindow}</code></td> 242 * <td>Called when the view is detached from its window. 243 * </td> 244 * </tr> 245 * 246 * <tr> 247 * <td><code>{@link #onWindowVisibilityChanged}</code></td> 248 * <td>Called when the visibility of the window containing the view 249 * has changed. 250 * </td> 251 * </tr> 252 * </tbody> 253 * 254 * </table> 255 * </p> 256 * 257 * <a name="IDs"></a> 258 * <h3>IDs</h3> 259 * Views may have an integer id associated with them. These ids are typically 260 * assigned in the layout XML files, and are used to find specific views within 261 * the view tree. A common pattern is to: 262 * <ul> 263 * <li>Define a Button in the layout file and assign it a unique ID. 264 * <pre> 265 * <Button 266 * android:id="@+id/my_button" 267 * android:layout_width="wrap_content" 268 * android:layout_height="wrap_content" 269 * android:text="@string/my_button_text"/> 270 * </pre></li> 271 * <li>From the onCreate method of an Activity, find the Button 272 * <pre class="prettyprint"> 273 * Button myButton = (Button) findViewById(R.id.my_button); 274 * </pre></li> 275 * </ul> 276 * <p> 277 * View IDs need not be unique throughout the tree, but it is good practice to 278 * ensure that they are at least unique within the part of the tree you are 279 * searching. 280 * </p> 281 * 282 * <a name="Position"></a> 283 * <h3>Position</h3> 284 * <p> 285 * The geometry of a view is that of a rectangle. A view has a location, 286 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 287 * two dimensions, expressed as a width and a height. The unit for location 288 * and dimensions is the pixel. 289 * </p> 290 * 291 * <p> 292 * It is possible to retrieve the location of a view by invoking the methods 293 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 294 * coordinate of the rectangle representing the view. The latter returns the 295 * top, or Y, coordinate of the rectangle representing the view. These methods 296 * both return the location of the view relative to its parent. For instance, 297 * when getLeft() returns 20, that means the view is located 20 pixels to the 298 * right of the left edge of its direct parent. 299 * </p> 300 * 301 * <p> 302 * In addition, several convenience methods are offered to avoid unnecessary 303 * computations, namely {@link #getRight()} and {@link #getBottom()}. 304 * These methods return the coordinates of the right and bottom edges of the 305 * rectangle representing the view. For instance, calling {@link #getRight()} 306 * is similar to the following computation: <code>getLeft() + getWidth()</code> 307 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 308 * </p> 309 * 310 * <a name="SizePaddingMargins"></a> 311 * <h3>Size, padding and margins</h3> 312 * <p> 313 * The size of a view is expressed with a width and a height. A view actually 314 * possess two pairs of width and height values. 315 * </p> 316 * 317 * <p> 318 * The first pair is known as <em>measured width</em> and 319 * <em>measured height</em>. These dimensions define how big a view wants to be 320 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 321 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 322 * and {@link #getMeasuredHeight()}. 323 * </p> 324 * 325 * <p> 326 * The second pair is simply known as <em>width</em> and <em>height</em>, or 327 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 328 * dimensions define the actual size of the view on screen, at drawing time and 329 * after layout. These values may, but do not have to, be different from the 330 * measured width and height. The width and height can be obtained by calling 331 * {@link #getWidth()} and {@link #getHeight()}. 332 * </p> 333 * 334 * <p> 335 * To measure its dimensions, a view takes into account its padding. The padding 336 * is expressed in pixels for the left, top, right and bottom parts of the view. 337 * Padding can be used to offset the content of the view by a specific amount of 338 * pixels. For instance, a left padding of 2 will push the view's content by 339 * 2 pixels to the right of the left edge. Padding can be set using the 340 * {@link #setPadding(int, int, int, int)} method and queried by calling 341 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 342 * {@link #getPaddingRight()} and {@link #getPaddingBottom()}. 343 * </p> 344 * 345 * <p> 346 * Even though a view can define a padding, it does not provide any support for 347 * margins. However, view groups provide such a support. Refer to 348 * {@link android.view.ViewGroup} and 349 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 350 * </p> 351 * 352 * <a name="Layout"></a> 353 * <h3>Layout</h3> 354 * <p> 355 * Layout is a two pass process: a measure pass and a layout pass. The measuring 356 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 357 * of the view tree. Each view pushes dimension specifications down the tree 358 * during the recursion. At the end of the measure pass, every view has stored 359 * its measurements. The second pass happens in 360 * {@link #layout(int,int,int,int)} and is also top-down. During 361 * this pass each parent is responsible for positioning all of its children 362 * using the sizes computed in the measure pass. 363 * </p> 364 * 365 * <p> 366 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 367 * {@link #getMeasuredHeight()} values must be set, along with those for all of 368 * that view's descendants. A view's measured width and measured height values 369 * must respect the constraints imposed by the view's parents. This guarantees 370 * that at the end of the measure pass, all parents accept all of their 371 * children's measurements. A parent view may call measure() more than once on 372 * its children. For example, the parent may measure each child once with 373 * unspecified dimensions to find out how big they want to be, then call 374 * measure() on them again with actual numbers if the sum of all the children's 375 * unconstrained sizes is too big or too small. 376 * </p> 377 * 378 * <p> 379 * The measure pass uses two classes to communicate dimensions. The 380 * {@link MeasureSpec} class is used by views to tell their parents how they 381 * want to be measured and positioned. The base LayoutParams class just 382 * describes how big the view wants to be for both width and height. For each 383 * dimension, it can specify one of: 384 * <ul> 385 * <li> an exact number 386 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 387 * (minus padding) 388 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 389 * enclose its content (plus padding). 390 * </ul> 391 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 392 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 393 * an X and Y value. 394 * </p> 395 * 396 * <p> 397 * MeasureSpecs are used to push requirements down the tree from parent to 398 * child. A MeasureSpec can be in one of three modes: 399 * <ul> 400 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 401 * of a child view. For example, a LinearLayout may call measure() on its child 402 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 403 * tall the child view wants to be given a width of 240 pixels. 404 * <li>EXACTLY: This is used by the parent to impose an exact size on the 405 * child. The child must use this size, and guarantee that all of its 406 * descendants will fit within this size. 407 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 408 * child. The child must gurantee that it and all of its descendants will fit 409 * within this size. 410 * </ul> 411 * </p> 412 * 413 * <p> 414 * To intiate a layout, call {@link #requestLayout}. This method is typically 415 * called by a view on itself when it believes that is can no longer fit within 416 * its current bounds. 417 * </p> 418 * 419 * <a name="Drawing"></a> 420 * <h3>Drawing</h3> 421 * <p> 422 * Drawing is handled by walking the tree and rendering each view that 423 * intersects the the invalid region. Because the tree is traversed in-order, 424 * this means that parents will draw before (i.e., behind) their children, with 425 * siblings drawn in the order they appear in the tree. 426 * If you set a background drawable for a View, then the View will draw it for you 427 * before calling back to its <code>onDraw()</code> method. 428 * </p> 429 * 430 * <p> 431 * Note that the framework will not draw views that are not in the invalid region. 432 * </p> 433 * 434 * <p> 435 * To force a view to draw, call {@link #invalidate()}. 436 * </p> 437 * 438 * <a name="EventHandlingThreading"></a> 439 * <h3>Event Handling and Threading</h3> 440 * <p> 441 * The basic cycle of a view is as follows: 442 * <ol> 443 * <li>An event comes in and is dispatched to the appropriate view. The view 444 * handles the event and notifies any listeners.</li> 445 * <li>If in the course of processing the event, the view's bounds may need 446 * to be changed, the view will call {@link #requestLayout()}.</li> 447 * <li>Similarly, if in the course of processing the event the view's appearance 448 * may need to be changed, the view will call {@link #invalidate()}.</li> 449 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 450 * the framework will take care of measuring, laying out, and drawing the tree 451 * as appropriate.</li> 452 * </ol> 453 * </p> 454 * 455 * <p><em>Note: The entire view tree is single threaded. You must always be on 456 * the UI thread when calling any method on any view.</em> 457 * If you are doing work on other threads and want to update the state of a view 458 * from that thread, you should use a {@link Handler}. 459 * </p> 460 * 461 * <a name="FocusHandling"></a> 462 * <h3>Focus Handling</h3> 463 * <p> 464 * The framework will handle routine focus movement in response to user input. 465 * This includes changing the focus as views are removed or hidden, or as new 466 * views become available. Views indicate their willingness to take focus 467 * through the {@link #isFocusable} method. To change whether a view can take 468 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 469 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 470 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 471 * </p> 472 * <p> 473 * Focus movement is based on an algorithm which finds the nearest neighbor in a 474 * given direction. In rare cases, the default algorithm may not match the 475 * intended behavior of the developer. In these situations, you can provide 476 * explicit overrides by using these XML attributes in the layout file: 477 * <pre> 478 * nextFocusDown 479 * nextFocusLeft 480 * nextFocusRight 481 * nextFocusUp 482 * </pre> 483 * </p> 484 * 485 * 486 * <p> 487 * To get a particular view to take focus, call {@link #requestFocus()}. 488 * </p> 489 * 490 * <a name="TouchMode"></a> 491 * <h3>Touch Mode</h3> 492 * <p> 493 * When a user is navigating a user interface via directional keys such as a D-pad, it is 494 * necessary to give focus to actionable items such as buttons so the user can see 495 * what will take input. If the device has touch capabilities, however, and the user 496 * begins interacting with the interface by touching it, it is no longer necessary to 497 * always highlight, or give focus to, a particular view. This motivates a mode 498 * for interaction named 'touch mode'. 499 * </p> 500 * <p> 501 * For a touch capable device, once the user touches the screen, the device 502 * will enter touch mode. From this point onward, only views for which 503 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 504 * Other views that are touchable, like buttons, will not take focus when touched; they will 505 * only fire the on click listeners. 506 * </p> 507 * <p> 508 * Any time a user hits a directional key, such as a D-pad direction, the view device will 509 * exit touch mode, and find a view to take focus, so that the user may resume interacting 510 * with the user interface without touching the screen again. 511 * </p> 512 * <p> 513 * The touch mode state is maintained across {@link android.app.Activity}s. Call 514 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 515 * </p> 516 * 517 * <a name="Scrolling"></a> 518 * <h3>Scrolling</h3> 519 * <p> 520 * The framework provides basic support for views that wish to internally 521 * scroll their content. This includes keeping track of the X and Y scroll 522 * offset as well as mechanisms for drawing scrollbars. See 523 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 524 * {@link #awakenScrollBars()} for more details. 525 * </p> 526 * 527 * <a name="Tags"></a> 528 * <h3>Tags</h3> 529 * <p> 530 * Unlike IDs, tags are not used to identify views. Tags are essentially an 531 * extra piece of information that can be associated with a view. They are most 532 * often used as a convenience to store data related to views in the views 533 * themselves rather than by putting them in a separate structure. 534 * </p> 535 * 536 * <a name="Animation"></a> 537 * <h3>Animation</h3> 538 * <p> 539 * You can attach an {@link Animation} object to a view using 540 * {@link #setAnimation(Animation)} or 541 * {@link #startAnimation(Animation)}. The animation can alter the scale, 542 * rotation, translation and alpha of a view over time. If the animation is 543 * attached to a view that has children, the animation will affect the entire 544 * subtree rooted by that node. When an animation is started, the framework will 545 * take care of redrawing the appropriate views until the animation completes. 546 * </p> 547 * 548 * <a name="Security"></a> 549 * <h3>Security</h3> 550 * <p> 551 * Sometimes it is essential that an application be able to verify that an action 552 * is being performed with the full knowledge and consent of the user, such as 553 * granting a permission request, making a purchase or clicking on an advertisement. 554 * Unfortunately, a malicious application could try to spoof the user into 555 * performing these actions, unaware, by concealing the intended purpose of the view. 556 * As a remedy, the framework offers a touch filtering mechanism that can be used to 557 * improve the security of views that provide access to sensitive functionality. 558 * </p><p> 559 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured} or set the 560 * andoird:filterTouchesWhenObscured attribute to true. When enabled, the framework 561 * will discard touches that are received whenever the view's window is obscured by 562 * another visible window. As a result, the view will not receive touches whenever a 563 * toast, dialog or other window appears above the view's window. 564 * </p><p> 565 * For more fine-grained control over security, consider overriding the 566 * {@link #onFilterTouchEventForSecurity} method to implement your own security policy. 567 * See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 568 * </p> 569 * 570 * @attr ref android.R.styleable#View_background 571 * @attr ref android.R.styleable#View_clickable 572 * @attr ref android.R.styleable#View_contentDescription 573 * @attr ref android.R.styleable#View_drawingCacheQuality 574 * @attr ref android.R.styleable#View_duplicateParentState 575 * @attr ref android.R.styleable#View_id 576 * @attr ref android.R.styleable#View_fadingEdge 577 * @attr ref android.R.styleable#View_fadingEdgeLength 578 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 579 * @attr ref android.R.styleable#View_fitsSystemWindows 580 * @attr ref android.R.styleable#View_isScrollContainer 581 * @attr ref android.R.styleable#View_focusable 582 * @attr ref android.R.styleable#View_focusableInTouchMode 583 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 584 * @attr ref android.R.styleable#View_keepScreenOn 585 * @attr ref android.R.styleable#View_longClickable 586 * @attr ref android.R.styleable#View_minHeight 587 * @attr ref android.R.styleable#View_minWidth 588 * @attr ref android.R.styleable#View_nextFocusDown 589 * @attr ref android.R.styleable#View_nextFocusLeft 590 * @attr ref android.R.styleable#View_nextFocusRight 591 * @attr ref android.R.styleable#View_nextFocusUp 592 * @attr ref android.R.styleable#View_onClick 593 * @attr ref android.R.styleable#View_padding 594 * @attr ref android.R.styleable#View_paddingBottom 595 * @attr ref android.R.styleable#View_paddingLeft 596 * @attr ref android.R.styleable#View_paddingRight 597 * @attr ref android.R.styleable#View_paddingTop 598 * @attr ref android.R.styleable#View_saveEnabled 599 * @attr ref android.R.styleable#View_scrollX 600 * @attr ref android.R.styleable#View_scrollY 601 * @attr ref android.R.styleable#View_scrollbarSize 602 * @attr ref android.R.styleable#View_scrollbarStyle 603 * @attr ref android.R.styleable#View_scrollbars 604 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 605 * @attr ref android.R.styleable#View_scrollbarFadeDuration 606 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 607 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 608 * @attr ref android.R.styleable#View_scrollbarThumbVertical 609 * @attr ref android.R.styleable#View_scrollbarTrackVertical 610 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 611 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 612 * @attr ref android.R.styleable#View_soundEffectsEnabled 613 * @attr ref android.R.styleable#View_tag 614 * @attr ref android.R.styleable#View_visibility 615 * 616 * @see android.view.ViewGroup 617 */ 618public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource { 619 private static final boolean DBG = false; 620 static final boolean DEBUG_DRAG = true; 621 622 /** 623 * The logging tag used by this class with android.util.Log. 624 */ 625 protected static final String VIEW_LOG_TAG = "View"; 626 627 /** 628 * Used to mark a View that has no ID. 629 */ 630 public static final int NO_ID = -1; 631 632 /** 633 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 634 * calling setFlags. 635 */ 636 private static final int NOT_FOCUSABLE = 0x00000000; 637 638 /** 639 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 640 * setFlags. 641 */ 642 private static final int FOCUSABLE = 0x00000001; 643 644 /** 645 * Mask for use with setFlags indicating bits used for focus. 646 */ 647 private static final int FOCUSABLE_MASK = 0x00000001; 648 649 /** 650 * This view will adjust its padding to fit sytem windows (e.g. status bar) 651 */ 652 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 653 654 /** 655 * This view is visible. Use with {@link #setVisibility}. 656 */ 657 public static final int VISIBLE = 0x00000000; 658 659 /** 660 * This view is invisible, but it still takes up space for layout purposes. 661 * Use with {@link #setVisibility}. 662 */ 663 public static final int INVISIBLE = 0x00000004; 664 665 /** 666 * This view is invisible, and it doesn't take any space for layout 667 * purposes. Use with {@link #setVisibility}. 668 */ 669 public static final int GONE = 0x00000008; 670 671 /** 672 * Mask for use with setFlags indicating bits used for visibility. 673 * {@hide} 674 */ 675 static final int VISIBILITY_MASK = 0x0000000C; 676 677 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 678 679 /** 680 * This view is enabled. Intrepretation varies by subclass. 681 * Use with ENABLED_MASK when calling setFlags. 682 * {@hide} 683 */ 684 static final int ENABLED = 0x00000000; 685 686 /** 687 * This view is disabled. Intrepretation varies by subclass. 688 * Use with ENABLED_MASK when calling setFlags. 689 * {@hide} 690 */ 691 static final int DISABLED = 0x00000020; 692 693 /** 694 * Mask for use with setFlags indicating bits used for indicating whether 695 * this view is enabled 696 * {@hide} 697 */ 698 static final int ENABLED_MASK = 0x00000020; 699 700 /** 701 * This view won't draw. {@link #onDraw} won't be called and further 702 * optimizations 703 * will be performed. It is okay to have this flag set and a background. 704 * Use with DRAW_MASK when calling setFlags. 705 * {@hide} 706 */ 707 static final int WILL_NOT_DRAW = 0x00000080; 708 709 /** 710 * Mask for use with setFlags indicating bits used for indicating whether 711 * this view is will draw 712 * {@hide} 713 */ 714 static final int DRAW_MASK = 0x00000080; 715 716 /** 717 * <p>This view doesn't show scrollbars.</p> 718 * {@hide} 719 */ 720 static final int SCROLLBARS_NONE = 0x00000000; 721 722 /** 723 * <p>This view shows horizontal scrollbars.</p> 724 * {@hide} 725 */ 726 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 727 728 /** 729 * <p>This view shows vertical scrollbars.</p> 730 * {@hide} 731 */ 732 static final int SCROLLBARS_VERTICAL = 0x00000200; 733 734 /** 735 * <p>Mask for use with setFlags indicating bits used for indicating which 736 * scrollbars are enabled.</p> 737 * {@hide} 738 */ 739 static final int SCROLLBARS_MASK = 0x00000300; 740 741 /** 742 * Indicates that the view should filter touches when its window is obscured. 743 * Refer to the class comments for more information about this security feature. 744 * {@hide} 745 */ 746 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 747 748 // note flag value 0x00000800 is now available for next flags... 749 750 /** 751 * <p>This view doesn't show fading edges.</p> 752 * {@hide} 753 */ 754 static final int FADING_EDGE_NONE = 0x00000000; 755 756 /** 757 * <p>This view shows horizontal fading edges.</p> 758 * {@hide} 759 */ 760 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 761 762 /** 763 * <p>This view shows vertical fading edges.</p> 764 * {@hide} 765 */ 766 static final int FADING_EDGE_VERTICAL = 0x00002000; 767 768 /** 769 * <p>Mask for use with setFlags indicating bits used for indicating which 770 * fading edges are enabled.</p> 771 * {@hide} 772 */ 773 static final int FADING_EDGE_MASK = 0x00003000; 774 775 /** 776 * <p>Indicates this view can be clicked. When clickable, a View reacts 777 * to clicks by notifying the OnClickListener.<p> 778 * {@hide} 779 */ 780 static final int CLICKABLE = 0x00004000; 781 782 /** 783 * <p>Indicates this view is caching its drawing into a bitmap.</p> 784 * {@hide} 785 */ 786 static final int DRAWING_CACHE_ENABLED = 0x00008000; 787 788 /** 789 * <p>Indicates that no icicle should be saved for this view.<p> 790 * {@hide} 791 */ 792 static final int SAVE_DISABLED = 0x000010000; 793 794 /** 795 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 796 * property.</p> 797 * {@hide} 798 */ 799 static final int SAVE_DISABLED_MASK = 0x000010000; 800 801 /** 802 * <p>Indicates that no drawing cache should ever be created for this view.<p> 803 * {@hide} 804 */ 805 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 806 807 /** 808 * <p>Indicates this view can take / keep focus when int touch mode.</p> 809 * {@hide} 810 */ 811 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 812 813 /** 814 * <p>Enables low quality mode for the drawing cache.</p> 815 */ 816 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 817 818 /** 819 * <p>Enables high quality mode for the drawing cache.</p> 820 */ 821 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 822 823 /** 824 * <p>Enables automatic quality mode for the drawing cache.</p> 825 */ 826 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 827 828 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 829 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 830 }; 831 832 /** 833 * <p>Mask for use with setFlags indicating bits used for the cache 834 * quality property.</p> 835 * {@hide} 836 */ 837 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 838 839 /** 840 * <p> 841 * Indicates this view can be long clicked. When long clickable, a View 842 * reacts to long clicks by notifying the OnLongClickListener or showing a 843 * context menu. 844 * </p> 845 * {@hide} 846 */ 847 static final int LONG_CLICKABLE = 0x00200000; 848 849 /** 850 * <p>Indicates that this view gets its drawable states from its direct parent 851 * and ignores its original internal states.</p> 852 * 853 * @hide 854 */ 855 static final int DUPLICATE_PARENT_STATE = 0x00400000; 856 857 /** 858 * The scrollbar style to display the scrollbars inside the content area, 859 * without increasing the padding. The scrollbars will be overlaid with 860 * translucency on the view's content. 861 */ 862 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 863 864 /** 865 * The scrollbar style to display the scrollbars inside the padded area, 866 * increasing the padding of the view. The scrollbars will not overlap the 867 * content area of the view. 868 */ 869 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 870 871 /** 872 * The scrollbar style to display the scrollbars at the edge of the view, 873 * without increasing the padding. The scrollbars will be overlaid with 874 * translucency. 875 */ 876 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 877 878 /** 879 * The scrollbar style to display the scrollbars at the edge of the view, 880 * increasing the padding of the view. The scrollbars will only overlap the 881 * background, if any. 882 */ 883 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 884 885 /** 886 * Mask to check if the scrollbar style is overlay or inset. 887 * {@hide} 888 */ 889 static final int SCROLLBARS_INSET_MASK = 0x01000000; 890 891 /** 892 * Mask to check if the scrollbar style is inside or outside. 893 * {@hide} 894 */ 895 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 896 897 /** 898 * Mask for scrollbar style. 899 * {@hide} 900 */ 901 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 902 903 /** 904 * View flag indicating that the screen should remain on while the 905 * window containing this view is visible to the user. This effectively 906 * takes care of automatically setting the WindowManager's 907 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 908 */ 909 public static final int KEEP_SCREEN_ON = 0x04000000; 910 911 /** 912 * View flag indicating whether this view should have sound effects enabled 913 * for events such as clicking and touching. 914 */ 915 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 916 917 /** 918 * View flag indicating whether this view should have haptic feedback 919 * enabled for events such as long presses. 920 */ 921 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 922 923 /** 924 * <p>Indicates that the view hierarchy should stop saving state when 925 * it reaches this view. If state saving is initiated immediately at 926 * the view, it will be allowed. 927 * {@hide} 928 */ 929 static final int PARENT_SAVE_DISABLED = 0x20000000; 930 931 /** 932 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 933 * {@hide} 934 */ 935 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 936 937 /** 938 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 939 * should add all focusable Views regardless if they are focusable in touch mode. 940 */ 941 public static final int FOCUSABLES_ALL = 0x00000000; 942 943 /** 944 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 945 * should add only Views focusable in touch mode. 946 */ 947 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 948 949 /** 950 * Use with {@link #focusSearch}. Move focus to the previous selectable 951 * item. 952 */ 953 public static final int FOCUS_BACKWARD = 0x00000001; 954 955 /** 956 * Use with {@link #focusSearch}. Move focus to the next selectable 957 * item. 958 */ 959 public static final int FOCUS_FORWARD = 0x00000002; 960 961 /** 962 * Use with {@link #focusSearch}. Move focus to the left. 963 */ 964 public static final int FOCUS_LEFT = 0x00000011; 965 966 /** 967 * Use with {@link #focusSearch}. Move focus up. 968 */ 969 public static final int FOCUS_UP = 0x00000021; 970 971 /** 972 * Use with {@link #focusSearch}. Move focus to the right. 973 */ 974 public static final int FOCUS_RIGHT = 0x00000042; 975 976 /** 977 * Use with {@link #focusSearch}. Move focus down. 978 */ 979 public static final int FOCUS_DOWN = 0x00000082; 980 981 /** 982 * Base View state sets 983 */ 984 // Singles 985 /** 986 * Indicates the view has no states set. States are used with 987 * {@link android.graphics.drawable.Drawable} to change the drawing of the 988 * view depending on its state. 989 * 990 * @see android.graphics.drawable.Drawable 991 * @see #getDrawableState() 992 */ 993 protected static final int[] EMPTY_STATE_SET; 994 /** 995 * Indicates the view is enabled. States are used with 996 * {@link android.graphics.drawable.Drawable} to change the drawing of the 997 * view depending on its state. 998 * 999 * @see android.graphics.drawable.Drawable 1000 * @see #getDrawableState() 1001 */ 1002 protected static final int[] ENABLED_STATE_SET; 1003 /** 1004 * Indicates the view is focused. States are used with 1005 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1006 * view depending on its state. 1007 * 1008 * @see android.graphics.drawable.Drawable 1009 * @see #getDrawableState() 1010 */ 1011 protected static final int[] FOCUSED_STATE_SET; 1012 /** 1013 * Indicates the view is selected. States are used with 1014 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1015 * view depending on its state. 1016 * 1017 * @see android.graphics.drawable.Drawable 1018 * @see #getDrawableState() 1019 */ 1020 protected static final int[] SELECTED_STATE_SET; 1021 /** 1022 * Indicates the view is pressed. States are used with 1023 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1024 * view depending on its state. 1025 * 1026 * @see android.graphics.drawable.Drawable 1027 * @see #getDrawableState() 1028 * @hide 1029 */ 1030 protected static final int[] PRESSED_STATE_SET; 1031 /** 1032 * Indicates the view's window has focus. States are used with 1033 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1034 * view depending on its state. 1035 * 1036 * @see android.graphics.drawable.Drawable 1037 * @see #getDrawableState() 1038 */ 1039 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1040 // Doubles 1041 /** 1042 * Indicates the view is enabled and has the focus. 1043 * 1044 * @see #ENABLED_STATE_SET 1045 * @see #FOCUSED_STATE_SET 1046 */ 1047 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1048 /** 1049 * Indicates the view is enabled and selected. 1050 * 1051 * @see #ENABLED_STATE_SET 1052 * @see #SELECTED_STATE_SET 1053 */ 1054 protected static final int[] ENABLED_SELECTED_STATE_SET; 1055 /** 1056 * Indicates the view is enabled and that its window has focus. 1057 * 1058 * @see #ENABLED_STATE_SET 1059 * @see #WINDOW_FOCUSED_STATE_SET 1060 */ 1061 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1062 /** 1063 * Indicates the view is focused and selected. 1064 * 1065 * @see #FOCUSED_STATE_SET 1066 * @see #SELECTED_STATE_SET 1067 */ 1068 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1069 /** 1070 * Indicates the view has the focus and that its window has the focus. 1071 * 1072 * @see #FOCUSED_STATE_SET 1073 * @see #WINDOW_FOCUSED_STATE_SET 1074 */ 1075 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1076 /** 1077 * Indicates the view is selected and that its window has the focus. 1078 * 1079 * @see #SELECTED_STATE_SET 1080 * @see #WINDOW_FOCUSED_STATE_SET 1081 */ 1082 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1083 // Triples 1084 /** 1085 * Indicates the view is enabled, focused and selected. 1086 * 1087 * @see #ENABLED_STATE_SET 1088 * @see #FOCUSED_STATE_SET 1089 * @see #SELECTED_STATE_SET 1090 */ 1091 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1092 /** 1093 * Indicates the view is enabled, focused and its window has the focus. 1094 * 1095 * @see #ENABLED_STATE_SET 1096 * @see #FOCUSED_STATE_SET 1097 * @see #WINDOW_FOCUSED_STATE_SET 1098 */ 1099 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1100 /** 1101 * Indicates the view is enabled, selected and its window has the focus. 1102 * 1103 * @see #ENABLED_STATE_SET 1104 * @see #SELECTED_STATE_SET 1105 * @see #WINDOW_FOCUSED_STATE_SET 1106 */ 1107 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1108 /** 1109 * Indicates the view is focused, selected and its window has the focus. 1110 * 1111 * @see #FOCUSED_STATE_SET 1112 * @see #SELECTED_STATE_SET 1113 * @see #WINDOW_FOCUSED_STATE_SET 1114 */ 1115 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1116 /** 1117 * Indicates the view is enabled, focused, selected and its window 1118 * has the focus. 1119 * 1120 * @see #ENABLED_STATE_SET 1121 * @see #FOCUSED_STATE_SET 1122 * @see #SELECTED_STATE_SET 1123 * @see #WINDOW_FOCUSED_STATE_SET 1124 */ 1125 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1126 /** 1127 * Indicates the view is pressed and its window has the focus. 1128 * 1129 * @see #PRESSED_STATE_SET 1130 * @see #WINDOW_FOCUSED_STATE_SET 1131 */ 1132 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1133 /** 1134 * Indicates the view is pressed and selected. 1135 * 1136 * @see #PRESSED_STATE_SET 1137 * @see #SELECTED_STATE_SET 1138 */ 1139 protected static final int[] PRESSED_SELECTED_STATE_SET; 1140 /** 1141 * Indicates the view is pressed, selected and its window has the focus. 1142 * 1143 * @see #PRESSED_STATE_SET 1144 * @see #SELECTED_STATE_SET 1145 * @see #WINDOW_FOCUSED_STATE_SET 1146 */ 1147 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1148 /** 1149 * Indicates the view is pressed and focused. 1150 * 1151 * @see #PRESSED_STATE_SET 1152 * @see #FOCUSED_STATE_SET 1153 */ 1154 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1155 /** 1156 * Indicates the view is pressed, focused and its window has the focus. 1157 * 1158 * @see #PRESSED_STATE_SET 1159 * @see #FOCUSED_STATE_SET 1160 * @see #WINDOW_FOCUSED_STATE_SET 1161 */ 1162 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1163 /** 1164 * Indicates the view is pressed, focused and selected. 1165 * 1166 * @see #PRESSED_STATE_SET 1167 * @see #SELECTED_STATE_SET 1168 * @see #FOCUSED_STATE_SET 1169 */ 1170 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1171 /** 1172 * Indicates the view is pressed, focused, selected and its window has the focus. 1173 * 1174 * @see #PRESSED_STATE_SET 1175 * @see #FOCUSED_STATE_SET 1176 * @see #SELECTED_STATE_SET 1177 * @see #WINDOW_FOCUSED_STATE_SET 1178 */ 1179 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1180 /** 1181 * Indicates the view is pressed and enabled. 1182 * 1183 * @see #PRESSED_STATE_SET 1184 * @see #ENABLED_STATE_SET 1185 */ 1186 protected static final int[] PRESSED_ENABLED_STATE_SET; 1187 /** 1188 * Indicates the view is pressed, enabled and its window has the focus. 1189 * 1190 * @see #PRESSED_STATE_SET 1191 * @see #ENABLED_STATE_SET 1192 * @see #WINDOW_FOCUSED_STATE_SET 1193 */ 1194 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1195 /** 1196 * Indicates the view is pressed, enabled and selected. 1197 * 1198 * @see #PRESSED_STATE_SET 1199 * @see #ENABLED_STATE_SET 1200 * @see #SELECTED_STATE_SET 1201 */ 1202 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1203 /** 1204 * Indicates the view is pressed, enabled, selected and its window has the 1205 * focus. 1206 * 1207 * @see #PRESSED_STATE_SET 1208 * @see #ENABLED_STATE_SET 1209 * @see #SELECTED_STATE_SET 1210 * @see #WINDOW_FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1213 /** 1214 * Indicates the view is pressed, enabled and focused. 1215 * 1216 * @see #PRESSED_STATE_SET 1217 * @see #ENABLED_STATE_SET 1218 * @see #FOCUSED_STATE_SET 1219 */ 1220 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1221 /** 1222 * Indicates the view is pressed, enabled, focused and its window has the 1223 * focus. 1224 * 1225 * @see #PRESSED_STATE_SET 1226 * @see #ENABLED_STATE_SET 1227 * @see #FOCUSED_STATE_SET 1228 * @see #WINDOW_FOCUSED_STATE_SET 1229 */ 1230 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1231 /** 1232 * Indicates the view is pressed, enabled, focused and selected. 1233 * 1234 * @see #PRESSED_STATE_SET 1235 * @see #ENABLED_STATE_SET 1236 * @see #SELECTED_STATE_SET 1237 * @see #FOCUSED_STATE_SET 1238 */ 1239 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1240 /** 1241 * Indicates the view is pressed, enabled, focused, selected and its window 1242 * has the focus. 1243 * 1244 * @see #PRESSED_STATE_SET 1245 * @see #ENABLED_STATE_SET 1246 * @see #SELECTED_STATE_SET 1247 * @see #FOCUSED_STATE_SET 1248 * @see #WINDOW_FOCUSED_STATE_SET 1249 */ 1250 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1251 1252 /** 1253 * The order here is very important to {@link #getDrawableState()} 1254 */ 1255 private static final int[][] VIEW_STATE_SETS; 1256 1257 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1258 static final int VIEW_STATE_SELECTED = 1 << 1; 1259 static final int VIEW_STATE_FOCUSED = 1 << 2; 1260 static final int VIEW_STATE_ENABLED = 1 << 3; 1261 static final int VIEW_STATE_PRESSED = 1 << 4; 1262 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1263 1264 static final int[] VIEW_STATE_IDS = new int[] { 1265 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1266 R.attr.state_selected, VIEW_STATE_SELECTED, 1267 R.attr.state_focused, VIEW_STATE_FOCUSED, 1268 R.attr.state_enabled, VIEW_STATE_ENABLED, 1269 R.attr.state_pressed, VIEW_STATE_PRESSED, 1270 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1271 }; 1272 1273 static { 1274 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1275 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1276 int viewState = R.styleable.ViewDrawableStates[i]; 1277 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1278 if (VIEW_STATE_IDS[j] == viewState) { 1279 orderedIds[i * 2] = viewState; 1280 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1281 } 1282 } 1283 } 1284 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1285 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1286 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1287 int numBits = Integer.bitCount(i); 1288 int[] set = new int[numBits]; 1289 int pos = 0; 1290 for (int j = 0; j < orderedIds.length; j += 2) { 1291 if ((i & orderedIds[j+1]) != 0) { 1292 set[pos++] = orderedIds[j]; 1293 } 1294 } 1295 VIEW_STATE_SETS[i] = set; 1296 } 1297 1298 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1299 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1300 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1301 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1302 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1303 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1304 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1305 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1306 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1307 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1308 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1309 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1310 | VIEW_STATE_FOCUSED]; 1311 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1312 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1313 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1314 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1315 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1316 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1317 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1318 | VIEW_STATE_ENABLED]; 1319 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1320 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1321 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1322 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1323 | VIEW_STATE_ENABLED]; 1324 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1325 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1326 | VIEW_STATE_ENABLED]; 1327 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1328 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1329 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1330 1331 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1332 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1333 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1334 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1335 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1336 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1337 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1338 | VIEW_STATE_PRESSED]; 1339 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1340 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1341 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1342 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1343 | VIEW_STATE_PRESSED]; 1344 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1345 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1346 | VIEW_STATE_PRESSED]; 1347 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1348 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1349 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1350 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1351 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1352 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1353 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1354 | VIEW_STATE_PRESSED]; 1355 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1356 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1357 | VIEW_STATE_PRESSED]; 1358 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1359 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1360 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1361 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1362 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1363 | VIEW_STATE_PRESSED]; 1364 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1365 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1366 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1367 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1368 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1369 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1370 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1371 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1372 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1373 | VIEW_STATE_PRESSED]; 1374 } 1375 1376 /** 1377 * Used by views that contain lists of items. This state indicates that 1378 * the view is showing the last item. 1379 * @hide 1380 */ 1381 protected static final int[] LAST_STATE_SET = {R.attr.state_last}; 1382 /** 1383 * Used by views that contain lists of items. This state indicates that 1384 * the view is showing the first item. 1385 * @hide 1386 */ 1387 protected static final int[] FIRST_STATE_SET = {R.attr.state_first}; 1388 /** 1389 * Used by views that contain lists of items. This state indicates that 1390 * the view is showing the middle item. 1391 * @hide 1392 */ 1393 protected static final int[] MIDDLE_STATE_SET = {R.attr.state_middle}; 1394 /** 1395 * Used by views that contain lists of items. This state indicates that 1396 * the view is showing only one item. 1397 * @hide 1398 */ 1399 protected static final int[] SINGLE_STATE_SET = {R.attr.state_single}; 1400 /** 1401 * Used by views that contain lists of items. This state indicates that 1402 * the view is pressed and showing the last item. 1403 * @hide 1404 */ 1405 protected static final int[] PRESSED_LAST_STATE_SET = {R.attr.state_last, R.attr.state_pressed}; 1406 /** 1407 * Used by views that contain lists of items. This state indicates that 1408 * the view is pressed and showing the first item. 1409 * @hide 1410 */ 1411 protected static final int[] PRESSED_FIRST_STATE_SET = {R.attr.state_first, R.attr.state_pressed}; 1412 /** 1413 * Used by views that contain lists of items. This state indicates that 1414 * the view is pressed and showing the middle item. 1415 * @hide 1416 */ 1417 protected static final int[] PRESSED_MIDDLE_STATE_SET = {R.attr.state_middle, R.attr.state_pressed}; 1418 /** 1419 * Used by views that contain lists of items. This state indicates that 1420 * the view is pressed and showing only one item. 1421 * @hide 1422 */ 1423 protected static final int[] PRESSED_SINGLE_STATE_SET = {R.attr.state_single, R.attr.state_pressed}; 1424 1425 /** 1426 * Temporary Rect currently for use in setBackground(). This will probably 1427 * be extended in the future to hold our own class with more than just 1428 * a Rect. :) 1429 */ 1430 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1431 1432 /** 1433 * Map used to store views' tags. 1434 */ 1435 private static WeakHashMap<View, SparseArray<Object>> sTags; 1436 1437 /** 1438 * Lock used to access sTags. 1439 */ 1440 private static final Object sTagsLock = new Object(); 1441 1442 /** 1443 * The animation currently associated with this view. 1444 * @hide 1445 */ 1446 protected Animation mCurrentAnimation = null; 1447 1448 /** 1449 * Width as measured during measure pass. 1450 * {@hide} 1451 */ 1452 @ViewDebug.ExportedProperty(category = "measurement") 1453 protected int mMeasuredWidth; 1454 1455 /** 1456 * Height as measured during measure pass. 1457 * {@hide} 1458 */ 1459 @ViewDebug.ExportedProperty(category = "measurement") 1460 protected int mMeasuredHeight; 1461 1462 /** 1463 * The view's identifier. 1464 * {@hide} 1465 * 1466 * @see #setId(int) 1467 * @see #getId() 1468 */ 1469 @ViewDebug.ExportedProperty(resolveId = true) 1470 int mID = NO_ID; 1471 1472 /** 1473 * The view's tag. 1474 * {@hide} 1475 * 1476 * @see #setTag(Object) 1477 * @see #getTag() 1478 */ 1479 protected Object mTag; 1480 1481 // for mPrivateFlags: 1482 /** {@hide} */ 1483 static final int WANTS_FOCUS = 0x00000001; 1484 /** {@hide} */ 1485 static final int FOCUSED = 0x00000002; 1486 /** {@hide} */ 1487 static final int SELECTED = 0x00000004; 1488 /** {@hide} */ 1489 static final int IS_ROOT_NAMESPACE = 0x00000008; 1490 /** {@hide} */ 1491 static final int HAS_BOUNDS = 0x00000010; 1492 /** {@hide} */ 1493 static final int DRAWN = 0x00000020; 1494 /** 1495 * When this flag is set, this view is running an animation on behalf of its 1496 * children and should therefore not cancel invalidate requests, even if they 1497 * lie outside of this view's bounds. 1498 * 1499 * {@hide} 1500 */ 1501 static final int DRAW_ANIMATION = 0x00000040; 1502 /** {@hide} */ 1503 static final int SKIP_DRAW = 0x00000080; 1504 /** {@hide} */ 1505 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1506 /** {@hide} */ 1507 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1508 /** {@hide} */ 1509 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1510 /** {@hide} */ 1511 static final int MEASURED_DIMENSION_SET = 0x00000800; 1512 /** {@hide} */ 1513 static final int FORCE_LAYOUT = 0x00001000; 1514 /** {@hide} */ 1515 static final int LAYOUT_REQUIRED = 0x00002000; 1516 1517 private static final int PRESSED = 0x00004000; 1518 1519 /** {@hide} */ 1520 static final int DRAWING_CACHE_VALID = 0x00008000; 1521 /** 1522 * Flag used to indicate that this view should be drawn once more (and only once 1523 * more) after its animation has completed. 1524 * {@hide} 1525 */ 1526 static final int ANIMATION_STARTED = 0x00010000; 1527 1528 private static final int SAVE_STATE_CALLED = 0x00020000; 1529 1530 /** 1531 * Indicates that the View returned true when onSetAlpha() was called and that 1532 * the alpha must be restored. 1533 * {@hide} 1534 */ 1535 static final int ALPHA_SET = 0x00040000; 1536 1537 /** 1538 * Set by {@link #setScrollContainer(boolean)}. 1539 */ 1540 static final int SCROLL_CONTAINER = 0x00080000; 1541 1542 /** 1543 * Set by {@link #setScrollContainer(boolean)}. 1544 */ 1545 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1546 1547 /** 1548 * View flag indicating whether this view was invalidated (fully or partially.) 1549 * 1550 * @hide 1551 */ 1552 static final int DIRTY = 0x00200000; 1553 1554 /** 1555 * View flag indicating whether this view was invalidated by an opaque 1556 * invalidate request. 1557 * 1558 * @hide 1559 */ 1560 static final int DIRTY_OPAQUE = 0x00400000; 1561 1562 /** 1563 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1564 * 1565 * @hide 1566 */ 1567 static final int DIRTY_MASK = 0x00600000; 1568 1569 /** 1570 * Indicates whether the background is opaque. 1571 * 1572 * @hide 1573 */ 1574 static final int OPAQUE_BACKGROUND = 0x00800000; 1575 1576 /** 1577 * Indicates whether the scrollbars are opaque. 1578 * 1579 * @hide 1580 */ 1581 static final int OPAQUE_SCROLLBARS = 0x01000000; 1582 1583 /** 1584 * Indicates whether the view is opaque. 1585 * 1586 * @hide 1587 */ 1588 static final int OPAQUE_MASK = 0x01800000; 1589 1590 /** 1591 * Indicates a prepressed state; 1592 * the short time between ACTION_DOWN and recognizing 1593 * a 'real' press. Prepressed is used to recognize quick taps 1594 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1595 * 1596 * @hide 1597 */ 1598 private static final int PREPRESSED = 0x02000000; 1599 1600 /** 1601 * Indicates whether the view is temporarily detached. 1602 * 1603 * @hide 1604 */ 1605 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1606 1607 /** 1608 * Indicates that we should awaken scroll bars once attached 1609 * 1610 * @hide 1611 */ 1612 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1613 1614 /** 1615 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1616 * for transform operations 1617 * 1618 * @hide 1619 */ 1620 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1621 1622 /** {@hide} */ 1623 static final int ACTIVATED = 0x40000000; 1624 1625 /** 1626 * The parent this view is attached to. 1627 * {@hide} 1628 * 1629 * @see #getParent() 1630 */ 1631 protected ViewParent mParent; 1632 1633 /** 1634 * {@hide} 1635 */ 1636 AttachInfo mAttachInfo; 1637 1638 /** 1639 * {@hide} 1640 */ 1641 @ViewDebug.ExportedProperty(flagMapping = { 1642 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1643 name = "FORCE_LAYOUT"), 1644 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1645 name = "LAYOUT_REQUIRED"), 1646 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1647 name = "DRAWING_CACHE_INVALID", outputIf = false), 1648 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1649 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1650 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1651 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1652 }) 1653 int mPrivateFlags; 1654 1655 /** 1656 * Count of how many windows this view has been attached to. 1657 */ 1658 int mWindowAttachCount; 1659 1660 /** 1661 * The layout parameters associated with this view and used by the parent 1662 * {@link android.view.ViewGroup} to determine how this view should be 1663 * laid out. 1664 * {@hide} 1665 */ 1666 protected ViewGroup.LayoutParams mLayoutParams; 1667 1668 /** 1669 * The view flags hold various views states. 1670 * {@hide} 1671 */ 1672 @ViewDebug.ExportedProperty 1673 int mViewFlags; 1674 1675 /** 1676 * The transform matrix for the View. This transform is calculated internally 1677 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1678 * is used by default. Do *not* use this variable directly; instead call 1679 * getMatrix(), which will automatically recalculate the matrix if necessary 1680 * to get the correct matrix based on the latest rotation and scale properties. 1681 */ 1682 private final Matrix mMatrix = new Matrix(); 1683 1684 /** 1685 * The transform matrix for the View. This transform is calculated internally 1686 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1687 * is used by default. Do *not* use this variable directly; instead call 1688 * getMatrix(), which will automatically recalculate the matrix if necessary 1689 * to get the correct matrix based on the latest rotation and scale properties. 1690 */ 1691 private Matrix mInverseMatrix; 1692 1693 /** 1694 * An internal variable that tracks whether we need to recalculate the 1695 * transform matrix, based on whether the rotation or scaleX/Y properties 1696 * have changed since the matrix was last calculated. 1697 */ 1698 private boolean mMatrixDirty = false; 1699 1700 /** 1701 * An internal variable that tracks whether we need to recalculate the 1702 * transform matrix, based on whether the rotation or scaleX/Y properties 1703 * have changed since the matrix was last calculated. 1704 */ 1705 private boolean mInverseMatrixDirty = true; 1706 1707 /** 1708 * A variable that tracks whether we need to recalculate the 1709 * transform matrix, based on whether the rotation or scaleX/Y properties 1710 * have changed since the matrix was last calculated. This variable 1711 * is only valid after a call to getMatrix(). 1712 */ 1713 private boolean mMatrixIsIdentity = true; 1714 1715 /** 1716 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 1717 */ 1718 private Camera mCamera = null; 1719 1720 /** 1721 * This matrix is used when computing the matrix for 3D rotations. 1722 */ 1723 private Matrix matrix3D = null; 1724 1725 /** 1726 * These prev values are used to recalculate a centered pivot point when necessary. The 1727 * pivot point is only used in matrix operations (when rotation, scale, or translation are 1728 * set), so thes values are only used then as well. 1729 */ 1730 private int mPrevWidth = -1; 1731 private int mPrevHeight = -1; 1732 1733 /** 1734 * Convenience value to check for float values that are close enough to zero to be considered 1735 * zero. 1736 */ 1737 private static final float NONZERO_EPSILON = .001f; 1738 1739 /** 1740 * The degrees rotation around the vertical axis through the pivot point. 1741 */ 1742 @ViewDebug.ExportedProperty 1743 private float mRotationY = 0f; 1744 1745 /** 1746 * The degrees rotation around the horizontal axis through the pivot point. 1747 */ 1748 @ViewDebug.ExportedProperty 1749 private float mRotationX = 0f; 1750 1751 /** 1752 * The degrees rotation around the pivot point. 1753 */ 1754 @ViewDebug.ExportedProperty 1755 private float mRotation = 0f; 1756 1757 /** 1758 * The amount of translation of the object away from its left property (post-layout). 1759 */ 1760 @ViewDebug.ExportedProperty 1761 private float mTranslationX = 0f; 1762 1763 /** 1764 * The amount of translation of the object away from its top property (post-layout). 1765 */ 1766 @ViewDebug.ExportedProperty 1767 private float mTranslationY = 0f; 1768 1769 /** 1770 * The amount of scale in the x direction around the pivot point. A 1771 * value of 1 means no scaling is applied. 1772 */ 1773 @ViewDebug.ExportedProperty 1774 private float mScaleX = 1f; 1775 1776 /** 1777 * The amount of scale in the y direction around the pivot point. A 1778 * value of 1 means no scaling is applied. 1779 */ 1780 @ViewDebug.ExportedProperty 1781 private float mScaleY = 1f; 1782 1783 /** 1784 * The amount of scale in the x direction around the pivot point. A 1785 * value of 1 means no scaling is applied. 1786 */ 1787 @ViewDebug.ExportedProperty 1788 private float mPivotX = 0f; 1789 1790 /** 1791 * The amount of scale in the y direction around the pivot point. A 1792 * value of 1 means no scaling is applied. 1793 */ 1794 @ViewDebug.ExportedProperty 1795 private float mPivotY = 0f; 1796 1797 /** 1798 * The opacity of the View. This is a value from 0 to 1, where 0 means 1799 * completely transparent and 1 means completely opaque. 1800 */ 1801 @ViewDebug.ExportedProperty 1802 private float mAlpha = 1f; 1803 1804 /** 1805 * The distance in pixels from the left edge of this view's parent 1806 * to the left edge of this view. 1807 * {@hide} 1808 */ 1809 @ViewDebug.ExportedProperty(category = "layout") 1810 protected int mLeft; 1811 /** 1812 * The distance in pixels from the left edge of this view's parent 1813 * to the right edge of this view. 1814 * {@hide} 1815 */ 1816 @ViewDebug.ExportedProperty(category = "layout") 1817 protected int mRight; 1818 /** 1819 * The distance in pixels from the top edge of this view's parent 1820 * to the top edge of this view. 1821 * {@hide} 1822 */ 1823 @ViewDebug.ExportedProperty(category = "layout") 1824 protected int mTop; 1825 /** 1826 * The distance in pixels from the top edge of this view's parent 1827 * to the bottom edge of this view. 1828 * {@hide} 1829 */ 1830 @ViewDebug.ExportedProperty(category = "layout") 1831 protected int mBottom; 1832 1833 /** 1834 * The offset, in pixels, by which the content of this view is scrolled 1835 * horizontally. 1836 * {@hide} 1837 */ 1838 @ViewDebug.ExportedProperty(category = "scrolling") 1839 protected int mScrollX; 1840 /** 1841 * The offset, in pixels, by which the content of this view is scrolled 1842 * vertically. 1843 * {@hide} 1844 */ 1845 @ViewDebug.ExportedProperty(category = "scrolling") 1846 protected int mScrollY; 1847 1848 /** 1849 * The left padding in pixels, that is the distance in pixels between the 1850 * left edge of this view and the left edge of its content. 1851 * {@hide} 1852 */ 1853 @ViewDebug.ExportedProperty(category = "padding") 1854 protected int mPaddingLeft; 1855 /** 1856 * The right padding in pixels, that is the distance in pixels between the 1857 * right edge of this view and the right edge of its content. 1858 * {@hide} 1859 */ 1860 @ViewDebug.ExportedProperty(category = "padding") 1861 protected int mPaddingRight; 1862 /** 1863 * The top padding in pixels, that is the distance in pixels between the 1864 * top edge of this view and the top edge of its content. 1865 * {@hide} 1866 */ 1867 @ViewDebug.ExportedProperty(category = "padding") 1868 protected int mPaddingTop; 1869 /** 1870 * The bottom padding in pixels, that is the distance in pixels between the 1871 * bottom edge of this view and the bottom edge of its content. 1872 * {@hide} 1873 */ 1874 @ViewDebug.ExportedProperty(category = "padding") 1875 protected int mPaddingBottom; 1876 1877 /** 1878 * Briefly describes the view and is primarily used for accessibility support. 1879 */ 1880 private CharSequence mContentDescription; 1881 1882 /** 1883 * Cache the paddingRight set by the user to append to the scrollbar's size. 1884 */ 1885 @ViewDebug.ExportedProperty(category = "padding") 1886 int mUserPaddingRight; 1887 1888 /** 1889 * Cache the paddingBottom set by the user to append to the scrollbar's size. 1890 */ 1891 @ViewDebug.ExportedProperty(category = "padding") 1892 int mUserPaddingBottom; 1893 1894 /** 1895 * @hide 1896 */ 1897 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 1898 /** 1899 * @hide 1900 */ 1901 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 1902 1903 private Resources mResources = null; 1904 1905 private Drawable mBGDrawable; 1906 1907 private int mBackgroundResource; 1908 private boolean mBackgroundSizeChanged; 1909 1910 /** 1911 * Listener used to dispatch focus change events. 1912 * This field should be made private, so it is hidden from the SDK. 1913 * {@hide} 1914 */ 1915 protected OnFocusChangeListener mOnFocusChangeListener; 1916 1917 /** 1918 * Listeners for layout change events. 1919 */ 1920 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 1921 1922 /** 1923 * Listener used to dispatch click events. 1924 * This field should be made private, so it is hidden from the SDK. 1925 * {@hide} 1926 */ 1927 protected OnClickListener mOnClickListener; 1928 1929 /** 1930 * Listener used to dispatch long click events. 1931 * This field should be made private, so it is hidden from the SDK. 1932 * {@hide} 1933 */ 1934 protected OnLongClickListener mOnLongClickListener; 1935 1936 /** 1937 * Listener used to build the context menu. 1938 * This field should be made private, so it is hidden from the SDK. 1939 * {@hide} 1940 */ 1941 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 1942 1943 private OnKeyListener mOnKeyListener; 1944 1945 private OnTouchListener mOnTouchListener; 1946 1947 /** 1948 * The application environment this view lives in. 1949 * This field should be made private, so it is hidden from the SDK. 1950 * {@hide} 1951 */ 1952 protected Context mContext; 1953 1954 private ScrollabilityCache mScrollCache; 1955 1956 private int[] mDrawableState = null; 1957 1958 private Bitmap mDrawingCache; 1959 private Bitmap mUnscaledDrawingCache; 1960 private DisplayList mDisplayList; 1961 1962 /** 1963 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 1964 * the user may specify which view to go to next. 1965 */ 1966 private int mNextFocusLeftId = View.NO_ID; 1967 1968 /** 1969 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 1970 * the user may specify which view to go to next. 1971 */ 1972 private int mNextFocusRightId = View.NO_ID; 1973 1974 /** 1975 * When this view has focus and the next focus is {@link #FOCUS_UP}, 1976 * the user may specify which view to go to next. 1977 */ 1978 private int mNextFocusUpId = View.NO_ID; 1979 1980 /** 1981 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 1982 * the user may specify which view to go to next. 1983 */ 1984 private int mNextFocusDownId = View.NO_ID; 1985 1986 private CheckForLongPress mPendingCheckForLongPress; 1987 private CheckForTap mPendingCheckForTap = null; 1988 private PerformClick mPerformClick; 1989 1990 private UnsetPressedState mUnsetPressedState; 1991 1992 /** 1993 * Whether the long press's action has been invoked. The tap's action is invoked on the 1994 * up event while a long press is invoked as soon as the long press duration is reached, so 1995 * a long press could be performed before the tap is checked, in which case the tap's action 1996 * should not be invoked. 1997 */ 1998 private boolean mHasPerformedLongPress; 1999 2000 /** 2001 * The minimum height of the view. We'll try our best to have the height 2002 * of this view to at least this amount. 2003 */ 2004 @ViewDebug.ExportedProperty(category = "measurement") 2005 private int mMinHeight; 2006 2007 /** 2008 * The minimum width of the view. We'll try our best to have the width 2009 * of this view to at least this amount. 2010 */ 2011 @ViewDebug.ExportedProperty(category = "measurement") 2012 private int mMinWidth; 2013 2014 /** 2015 * The delegate to handle touch events that are physically in this view 2016 * but should be handled by another view. 2017 */ 2018 private TouchDelegate mTouchDelegate = null; 2019 2020 /** 2021 * Solid color to use as a background when creating the drawing cache. Enables 2022 * the cache to use 16 bit bitmaps instead of 32 bit. 2023 */ 2024 private int mDrawingCacheBackgroundColor = 0; 2025 2026 /** 2027 * Special tree observer used when mAttachInfo is null. 2028 */ 2029 private ViewTreeObserver mFloatingTreeObserver; 2030 2031 /** 2032 * Cache the touch slop from the context that created the view. 2033 */ 2034 private int mTouchSlop; 2035 2036 /** 2037 * Cache drag/drop state 2038 * 2039 */ 2040 boolean mCanAcceptDrop; 2041 private boolean mIsCurrentDropTarget; 2042 private int mThumbnailWidth; 2043 private int mThumbnailHeight; 2044 2045 /** 2046 * Simple constructor to use when creating a view from code. 2047 * 2048 * @param context The Context the view is running in, through which it can 2049 * access the current theme, resources, etc. 2050 */ 2051 public View(Context context) { 2052 mContext = context; 2053 mResources = context != null ? context.getResources() : null; 2054 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 2055 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2056 } 2057 2058 /** 2059 * Constructor that is called when inflating a view from XML. This is called 2060 * when a view is being constructed from an XML file, supplying attributes 2061 * that were specified in the XML file. This version uses a default style of 2062 * 0, so the only attribute values applied are those in the Context's Theme 2063 * and the given AttributeSet. 2064 * 2065 * <p> 2066 * The method onFinishInflate() will be called after all children have been 2067 * added. 2068 * 2069 * @param context The Context the view is running in, through which it can 2070 * access the current theme, resources, etc. 2071 * @param attrs The attributes of the XML tag that is inflating the view. 2072 * @see #View(Context, AttributeSet, int) 2073 */ 2074 public View(Context context, AttributeSet attrs) { 2075 this(context, attrs, 0); 2076 } 2077 2078 /** 2079 * Perform inflation from XML and apply a class-specific base style. This 2080 * constructor of View allows subclasses to use their own base style when 2081 * they are inflating. For example, a Button class's constructor would call 2082 * this version of the super class constructor and supply 2083 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2084 * the theme's button style to modify all of the base view attributes (in 2085 * particular its background) as well as the Button class's attributes. 2086 * 2087 * @param context The Context the view is running in, through which it can 2088 * access the current theme, resources, etc. 2089 * @param attrs The attributes of the XML tag that is inflating the view. 2090 * @param defStyle The default style to apply to this view. If 0, no style 2091 * will be applied (beyond what is included in the theme). This may 2092 * either be an attribute resource, whose value will be retrieved 2093 * from the current theme, or an explicit style resource. 2094 * @see #View(Context, AttributeSet) 2095 */ 2096 public View(Context context, AttributeSet attrs, int defStyle) { 2097 this(context); 2098 2099 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2100 defStyle, 0); 2101 2102 Drawable background = null; 2103 2104 int leftPadding = -1; 2105 int topPadding = -1; 2106 int rightPadding = -1; 2107 int bottomPadding = -1; 2108 2109 int padding = -1; 2110 2111 int viewFlagValues = 0; 2112 int viewFlagMasks = 0; 2113 2114 boolean setScrollContainer = false; 2115 2116 int x = 0; 2117 int y = 0; 2118 2119 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2120 2121 final int N = a.getIndexCount(); 2122 for (int i = 0; i < N; i++) { 2123 int attr = a.getIndex(i); 2124 switch (attr) { 2125 case com.android.internal.R.styleable.View_background: 2126 background = a.getDrawable(attr); 2127 break; 2128 case com.android.internal.R.styleable.View_padding: 2129 padding = a.getDimensionPixelSize(attr, -1); 2130 break; 2131 case com.android.internal.R.styleable.View_paddingLeft: 2132 leftPadding = a.getDimensionPixelSize(attr, -1); 2133 break; 2134 case com.android.internal.R.styleable.View_paddingTop: 2135 topPadding = a.getDimensionPixelSize(attr, -1); 2136 break; 2137 case com.android.internal.R.styleable.View_paddingRight: 2138 rightPadding = a.getDimensionPixelSize(attr, -1); 2139 break; 2140 case com.android.internal.R.styleable.View_paddingBottom: 2141 bottomPadding = a.getDimensionPixelSize(attr, -1); 2142 break; 2143 case com.android.internal.R.styleable.View_scrollX: 2144 x = a.getDimensionPixelOffset(attr, 0); 2145 break; 2146 case com.android.internal.R.styleable.View_scrollY: 2147 y = a.getDimensionPixelOffset(attr, 0); 2148 break; 2149 case com.android.internal.R.styleable.View_id: 2150 mID = a.getResourceId(attr, NO_ID); 2151 break; 2152 case com.android.internal.R.styleable.View_tag: 2153 mTag = a.getText(attr); 2154 break; 2155 case com.android.internal.R.styleable.View_fitsSystemWindows: 2156 if (a.getBoolean(attr, false)) { 2157 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2158 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2159 } 2160 break; 2161 case com.android.internal.R.styleable.View_focusable: 2162 if (a.getBoolean(attr, false)) { 2163 viewFlagValues |= FOCUSABLE; 2164 viewFlagMasks |= FOCUSABLE_MASK; 2165 } 2166 break; 2167 case com.android.internal.R.styleable.View_focusableInTouchMode: 2168 if (a.getBoolean(attr, false)) { 2169 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2170 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2171 } 2172 break; 2173 case com.android.internal.R.styleable.View_clickable: 2174 if (a.getBoolean(attr, false)) { 2175 viewFlagValues |= CLICKABLE; 2176 viewFlagMasks |= CLICKABLE; 2177 } 2178 break; 2179 case com.android.internal.R.styleable.View_longClickable: 2180 if (a.getBoolean(attr, false)) { 2181 viewFlagValues |= LONG_CLICKABLE; 2182 viewFlagMasks |= LONG_CLICKABLE; 2183 } 2184 break; 2185 case com.android.internal.R.styleable.View_saveEnabled: 2186 if (!a.getBoolean(attr, true)) { 2187 viewFlagValues |= SAVE_DISABLED; 2188 viewFlagMasks |= SAVE_DISABLED_MASK; 2189 } 2190 break; 2191 case com.android.internal.R.styleable.View_duplicateParentState: 2192 if (a.getBoolean(attr, false)) { 2193 viewFlagValues |= DUPLICATE_PARENT_STATE; 2194 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2195 } 2196 break; 2197 case com.android.internal.R.styleable.View_visibility: 2198 final int visibility = a.getInt(attr, 0); 2199 if (visibility != 0) { 2200 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2201 viewFlagMasks |= VISIBILITY_MASK; 2202 } 2203 break; 2204 case com.android.internal.R.styleable.View_drawingCacheQuality: 2205 final int cacheQuality = a.getInt(attr, 0); 2206 if (cacheQuality != 0) { 2207 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2208 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2209 } 2210 break; 2211 case com.android.internal.R.styleable.View_contentDescription: 2212 mContentDescription = a.getString(attr); 2213 break; 2214 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2215 if (!a.getBoolean(attr, true)) { 2216 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2217 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2218 } 2219 break; 2220 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2221 if (!a.getBoolean(attr, true)) { 2222 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2223 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2224 } 2225 break; 2226 case R.styleable.View_scrollbars: 2227 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2228 if (scrollbars != SCROLLBARS_NONE) { 2229 viewFlagValues |= scrollbars; 2230 viewFlagMasks |= SCROLLBARS_MASK; 2231 initializeScrollbars(a); 2232 } 2233 break; 2234 case R.styleable.View_fadingEdge: 2235 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2236 if (fadingEdge != FADING_EDGE_NONE) { 2237 viewFlagValues |= fadingEdge; 2238 viewFlagMasks |= FADING_EDGE_MASK; 2239 initializeFadingEdge(a); 2240 } 2241 break; 2242 case R.styleable.View_scrollbarStyle: 2243 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2244 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2245 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2246 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2247 } 2248 break; 2249 case R.styleable.View_isScrollContainer: 2250 setScrollContainer = true; 2251 if (a.getBoolean(attr, false)) { 2252 setScrollContainer(true); 2253 } 2254 break; 2255 case com.android.internal.R.styleable.View_keepScreenOn: 2256 if (a.getBoolean(attr, false)) { 2257 viewFlagValues |= KEEP_SCREEN_ON; 2258 viewFlagMasks |= KEEP_SCREEN_ON; 2259 } 2260 break; 2261 case R.styleable.View_filterTouchesWhenObscured: 2262 if (a.getBoolean(attr, false)) { 2263 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2264 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2265 } 2266 break; 2267 case R.styleable.View_nextFocusLeft: 2268 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2269 break; 2270 case R.styleable.View_nextFocusRight: 2271 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2272 break; 2273 case R.styleable.View_nextFocusUp: 2274 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2275 break; 2276 case R.styleable.View_nextFocusDown: 2277 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2278 break; 2279 case R.styleable.View_minWidth: 2280 mMinWidth = a.getDimensionPixelSize(attr, 0); 2281 break; 2282 case R.styleable.View_minHeight: 2283 mMinHeight = a.getDimensionPixelSize(attr, 0); 2284 break; 2285 case R.styleable.View_onClick: 2286 if (context.isRestricted()) { 2287 throw new IllegalStateException("The android:onClick attribute cannot " 2288 + "be used within a restricted context"); 2289 } 2290 2291 final String handlerName = a.getString(attr); 2292 if (handlerName != null) { 2293 setOnClickListener(new OnClickListener() { 2294 private Method mHandler; 2295 2296 public void onClick(View v) { 2297 if (mHandler == null) { 2298 try { 2299 mHandler = getContext().getClass().getMethod(handlerName, 2300 View.class); 2301 } catch (NoSuchMethodException e) { 2302 int id = getId(); 2303 String idText = id == NO_ID ? "" : " with id '" 2304 + getContext().getResources().getResourceEntryName( 2305 id) + "'"; 2306 throw new IllegalStateException("Could not find a method " + 2307 handlerName + "(View) in the activity " 2308 + getContext().getClass() + " for onClick handler" 2309 + " on view " + View.this.getClass() + idText, e); 2310 } 2311 } 2312 2313 try { 2314 mHandler.invoke(getContext(), View.this); 2315 } catch (IllegalAccessException e) { 2316 throw new IllegalStateException("Could not execute non " 2317 + "public method of the activity", e); 2318 } catch (InvocationTargetException e) { 2319 throw new IllegalStateException("Could not execute " 2320 + "method of the activity", e); 2321 } 2322 } 2323 }); 2324 } 2325 break; 2326 } 2327 } 2328 2329 if (background != null) { 2330 setBackgroundDrawable(background); 2331 } 2332 2333 if (padding >= 0) { 2334 leftPadding = padding; 2335 topPadding = padding; 2336 rightPadding = padding; 2337 bottomPadding = padding; 2338 } 2339 2340 // If the user specified the padding (either with android:padding or 2341 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2342 // use the default padding or the padding from the background drawable 2343 // (stored at this point in mPadding*) 2344 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2345 topPadding >= 0 ? topPadding : mPaddingTop, 2346 rightPadding >= 0 ? rightPadding : mPaddingRight, 2347 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2348 2349 if (viewFlagMasks != 0) { 2350 setFlags(viewFlagValues, viewFlagMasks); 2351 } 2352 2353 // Needs to be called after mViewFlags is set 2354 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2355 recomputePadding(); 2356 } 2357 2358 if (x != 0 || y != 0) { 2359 scrollTo(x, y); 2360 } 2361 2362 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2363 setScrollContainer(true); 2364 } 2365 2366 computeOpaqueFlags(); 2367 2368 a.recycle(); 2369 } 2370 2371 /** 2372 * Non-public constructor for use in testing 2373 */ 2374 View() { 2375 } 2376 2377 /** 2378 * <p> 2379 * Initializes the fading edges from a given set of styled attributes. This 2380 * method should be called by subclasses that need fading edges and when an 2381 * instance of these subclasses is created programmatically rather than 2382 * being inflated from XML. This method is automatically called when the XML 2383 * is inflated. 2384 * </p> 2385 * 2386 * @param a the styled attributes set to initialize the fading edges from 2387 */ 2388 protected void initializeFadingEdge(TypedArray a) { 2389 initScrollCache(); 2390 2391 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2392 R.styleable.View_fadingEdgeLength, 2393 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2394 } 2395 2396 /** 2397 * Returns the size of the vertical faded edges used to indicate that more 2398 * content in this view is visible. 2399 * 2400 * @return The size in pixels of the vertical faded edge or 0 if vertical 2401 * faded edges are not enabled for this view. 2402 * @attr ref android.R.styleable#View_fadingEdgeLength 2403 */ 2404 public int getVerticalFadingEdgeLength() { 2405 if (isVerticalFadingEdgeEnabled()) { 2406 ScrollabilityCache cache = mScrollCache; 2407 if (cache != null) { 2408 return cache.fadingEdgeLength; 2409 } 2410 } 2411 return 0; 2412 } 2413 2414 /** 2415 * Set the size of the faded edge used to indicate that more content in this 2416 * view is available. Will not change whether the fading edge is enabled; use 2417 * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled} 2418 * to enable the fading edge for the vertical or horizontal fading edges. 2419 * 2420 * @param length The size in pixels of the faded edge used to indicate that more 2421 * content in this view is visible. 2422 */ 2423 public void setFadingEdgeLength(int length) { 2424 initScrollCache(); 2425 mScrollCache.fadingEdgeLength = length; 2426 } 2427 2428 /** 2429 * Returns the size of the horizontal faded edges used to indicate that more 2430 * content in this view is visible. 2431 * 2432 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2433 * faded edges are not enabled for this view. 2434 * @attr ref android.R.styleable#View_fadingEdgeLength 2435 */ 2436 public int getHorizontalFadingEdgeLength() { 2437 if (isHorizontalFadingEdgeEnabled()) { 2438 ScrollabilityCache cache = mScrollCache; 2439 if (cache != null) { 2440 return cache.fadingEdgeLength; 2441 } 2442 } 2443 return 0; 2444 } 2445 2446 /** 2447 * Returns the width of the vertical scrollbar. 2448 * 2449 * @return The width in pixels of the vertical scrollbar or 0 if there 2450 * is no vertical scrollbar. 2451 */ 2452 public int getVerticalScrollbarWidth() { 2453 ScrollabilityCache cache = mScrollCache; 2454 if (cache != null) { 2455 ScrollBarDrawable scrollBar = cache.scrollBar; 2456 if (scrollBar != null) { 2457 int size = scrollBar.getSize(true); 2458 if (size <= 0) { 2459 size = cache.scrollBarSize; 2460 } 2461 return size; 2462 } 2463 return 0; 2464 } 2465 return 0; 2466 } 2467 2468 /** 2469 * Returns the height of the horizontal scrollbar. 2470 * 2471 * @return The height in pixels of the horizontal scrollbar or 0 if 2472 * there is no horizontal scrollbar. 2473 */ 2474 protected int getHorizontalScrollbarHeight() { 2475 ScrollabilityCache cache = mScrollCache; 2476 if (cache != null) { 2477 ScrollBarDrawable scrollBar = cache.scrollBar; 2478 if (scrollBar != null) { 2479 int size = scrollBar.getSize(false); 2480 if (size <= 0) { 2481 size = cache.scrollBarSize; 2482 } 2483 return size; 2484 } 2485 return 0; 2486 } 2487 return 0; 2488 } 2489 2490 /** 2491 * <p> 2492 * Initializes the scrollbars from a given set of styled attributes. This 2493 * method should be called by subclasses that need scrollbars and when an 2494 * instance of these subclasses is created programmatically rather than 2495 * being inflated from XML. This method is automatically called when the XML 2496 * is inflated. 2497 * </p> 2498 * 2499 * @param a the styled attributes set to initialize the scrollbars from 2500 */ 2501 protected void initializeScrollbars(TypedArray a) { 2502 initScrollCache(); 2503 2504 final ScrollabilityCache scrollabilityCache = mScrollCache; 2505 2506 if (scrollabilityCache.scrollBar == null) { 2507 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 2508 } 2509 2510 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 2511 2512 if (!fadeScrollbars) { 2513 scrollabilityCache.state = ScrollabilityCache.ON; 2514 } 2515 scrollabilityCache.fadeScrollBars = fadeScrollbars; 2516 2517 2518 scrollabilityCache.scrollBarFadeDuration = a.getInt( 2519 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 2520 .getScrollBarFadeDuration()); 2521 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 2522 R.styleable.View_scrollbarDefaultDelayBeforeFade, 2523 ViewConfiguration.getScrollDefaultDelay()); 2524 2525 2526 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 2527 com.android.internal.R.styleable.View_scrollbarSize, 2528 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 2529 2530 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 2531 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 2532 2533 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 2534 if (thumb != null) { 2535 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 2536 } 2537 2538 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 2539 false); 2540 if (alwaysDraw) { 2541 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 2542 } 2543 2544 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 2545 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 2546 2547 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 2548 if (thumb != null) { 2549 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 2550 } 2551 2552 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 2553 false); 2554 if (alwaysDraw) { 2555 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 2556 } 2557 2558 // Re-apply user/background padding so that scrollbar(s) get added 2559 recomputePadding(); 2560 } 2561 2562 /** 2563 * <p> 2564 * Initalizes the scrollability cache if necessary. 2565 * </p> 2566 */ 2567 private void initScrollCache() { 2568 if (mScrollCache == null) { 2569 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 2570 } 2571 } 2572 2573 /** 2574 * Register a callback to be invoked when focus of this view changed. 2575 * 2576 * @param l The callback that will run. 2577 */ 2578 public void setOnFocusChangeListener(OnFocusChangeListener l) { 2579 mOnFocusChangeListener = l; 2580 } 2581 2582 /** 2583 * Add a listener that will be called when the bounds of the view change due to 2584 * layout processing. 2585 * 2586 * @param listener The listener that will be called when layout bounds change. 2587 */ 2588 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 2589 if (mOnLayoutChangeListeners == null) { 2590 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 2591 } 2592 mOnLayoutChangeListeners.add(listener); 2593 } 2594 2595 /** 2596 * Remove a listener for layout changes. 2597 * 2598 * @param listener The listener for layout bounds change. 2599 */ 2600 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 2601 if (mOnLayoutChangeListeners == null) { 2602 return; 2603 } 2604 mOnLayoutChangeListeners.remove(listener); 2605 } 2606 2607 /** 2608 * Gets the current list of listeners for layout changes. 2609 * @return 2610 */ 2611 public List<OnLayoutChangeListener> getOnLayoutChangeListeners() { 2612 return mOnLayoutChangeListeners; 2613 } 2614 2615 /** 2616 * Returns the focus-change callback registered for this view. 2617 * 2618 * @return The callback, or null if one is not registered. 2619 */ 2620 public OnFocusChangeListener getOnFocusChangeListener() { 2621 return mOnFocusChangeListener; 2622 } 2623 2624 /** 2625 * Register a callback to be invoked when this view is clicked. If this view is not 2626 * clickable, it becomes clickable. 2627 * 2628 * @param l The callback that will run 2629 * 2630 * @see #setClickable(boolean) 2631 */ 2632 public void setOnClickListener(OnClickListener l) { 2633 if (!isClickable()) { 2634 setClickable(true); 2635 } 2636 mOnClickListener = l; 2637 } 2638 2639 /** 2640 * Register a callback to be invoked when this view is clicked and held. If this view is not 2641 * long clickable, it becomes long clickable. 2642 * 2643 * @param l The callback that will run 2644 * 2645 * @see #setLongClickable(boolean) 2646 */ 2647 public void setOnLongClickListener(OnLongClickListener l) { 2648 if (!isLongClickable()) { 2649 setLongClickable(true); 2650 } 2651 mOnLongClickListener = l; 2652 } 2653 2654 /** 2655 * Register a callback to be invoked when the context menu for this view is 2656 * being built. If this view is not long clickable, it becomes long clickable. 2657 * 2658 * @param l The callback that will run 2659 * 2660 */ 2661 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 2662 if (!isLongClickable()) { 2663 setLongClickable(true); 2664 } 2665 mOnCreateContextMenuListener = l; 2666 } 2667 2668 /** 2669 * Call this view's OnClickListener, if it is defined. 2670 * 2671 * @return True there was an assigned OnClickListener that was called, false 2672 * otherwise is returned. 2673 */ 2674 public boolean performClick() { 2675 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 2676 2677 if (mOnClickListener != null) { 2678 playSoundEffect(SoundEffectConstants.CLICK); 2679 mOnClickListener.onClick(this); 2680 return true; 2681 } 2682 2683 return false; 2684 } 2685 2686 /** 2687 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 2688 * OnLongClickListener did not consume the event. 2689 * 2690 * @return True if one of the above receivers consumed the event, false otherwise. 2691 */ 2692 public boolean performLongClick() { 2693 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 2694 2695 boolean handled = false; 2696 if (mOnLongClickListener != null) { 2697 handled = mOnLongClickListener.onLongClick(View.this); 2698 } 2699 if (!handled) { 2700 handled = showContextMenu(); 2701 } 2702 if (handled) { 2703 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 2704 } 2705 return handled; 2706 } 2707 2708 /** 2709 * Bring up the context menu for this view. 2710 * 2711 * @return Whether a context menu was displayed. 2712 */ 2713 public boolean showContextMenu() { 2714 return getParent().showContextMenuForChild(this); 2715 } 2716 2717 /** 2718 * Start an action mode. 2719 * 2720 * @param callback Callback that will control the lifecycle of the action mode 2721 * @return The new action mode if it is started, null otherwise 2722 * 2723 * @see ActionMode 2724 */ 2725 public ActionMode startActionMode(ActionMode.Callback callback) { 2726 return getParent().startActionModeForChild(this, callback); 2727 } 2728 2729 /** 2730 * Register a callback to be invoked when a key is pressed in this view. 2731 * @param l the key listener to attach to this view 2732 */ 2733 public void setOnKeyListener(OnKeyListener l) { 2734 mOnKeyListener = l; 2735 } 2736 2737 /** 2738 * Register a callback to be invoked when a touch event is sent to this view. 2739 * @param l the touch listener to attach to this view 2740 */ 2741 public void setOnTouchListener(OnTouchListener l) { 2742 mOnTouchListener = l; 2743 } 2744 2745 /** 2746 * Give this view focus. This will cause {@link #onFocusChanged} to be called. 2747 * 2748 * Note: this does not check whether this {@link View} should get focus, it just 2749 * gives it focus no matter what. It should only be called internally by framework 2750 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 2751 * 2752 * @param direction values are View.FOCUS_UP, View.FOCUS_DOWN, 2753 * View.FOCUS_LEFT or View.FOCUS_RIGHT. This is the direction which 2754 * focus moved when requestFocus() is called. It may not always 2755 * apply, in which case use the default View.FOCUS_DOWN. 2756 * @param previouslyFocusedRect The rectangle of the view that had focus 2757 * prior in this View's coordinate system. 2758 */ 2759 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 2760 if (DBG) { 2761 System.out.println(this + " requestFocus()"); 2762 } 2763 2764 if ((mPrivateFlags & FOCUSED) == 0) { 2765 mPrivateFlags |= FOCUSED; 2766 2767 if (mParent != null) { 2768 mParent.requestChildFocus(this, this); 2769 } 2770 2771 onFocusChanged(true, direction, previouslyFocusedRect); 2772 refreshDrawableState(); 2773 } 2774 } 2775 2776 /** 2777 * Request that a rectangle of this view be visible on the screen, 2778 * scrolling if necessary just enough. 2779 * 2780 * <p>A View should call this if it maintains some notion of which part 2781 * of its content is interesting. For example, a text editing view 2782 * should call this when its cursor moves. 2783 * 2784 * @param rectangle The rectangle. 2785 * @return Whether any parent scrolled. 2786 */ 2787 public boolean requestRectangleOnScreen(Rect rectangle) { 2788 return requestRectangleOnScreen(rectangle, false); 2789 } 2790 2791 /** 2792 * Request that a rectangle of this view be visible on the screen, 2793 * scrolling if necessary just enough. 2794 * 2795 * <p>A View should call this if it maintains some notion of which part 2796 * of its content is interesting. For example, a text editing view 2797 * should call this when its cursor moves. 2798 * 2799 * <p>When <code>immediate</code> is set to true, scrolling will not be 2800 * animated. 2801 * 2802 * @param rectangle The rectangle. 2803 * @param immediate True to forbid animated scrolling, false otherwise 2804 * @return Whether any parent scrolled. 2805 */ 2806 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 2807 View child = this; 2808 ViewParent parent = mParent; 2809 boolean scrolled = false; 2810 while (parent != null) { 2811 scrolled |= parent.requestChildRectangleOnScreen(child, 2812 rectangle, immediate); 2813 2814 // offset rect so next call has the rectangle in the 2815 // coordinate system of its direct child. 2816 rectangle.offset(child.getLeft(), child.getTop()); 2817 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 2818 2819 if (!(parent instanceof View)) { 2820 break; 2821 } 2822 2823 child = (View) parent; 2824 parent = child.getParent(); 2825 } 2826 return scrolled; 2827 } 2828 2829 /** 2830 * Called when this view wants to give up focus. This will cause 2831 * {@link #onFocusChanged} to be called. 2832 */ 2833 public void clearFocus() { 2834 if (DBG) { 2835 System.out.println(this + " clearFocus()"); 2836 } 2837 2838 if ((mPrivateFlags & FOCUSED) != 0) { 2839 mPrivateFlags &= ~FOCUSED; 2840 2841 if (mParent != null) { 2842 mParent.clearChildFocus(this); 2843 } 2844 2845 onFocusChanged(false, 0, null); 2846 refreshDrawableState(); 2847 } 2848 } 2849 2850 /** 2851 * Called to clear the focus of a view that is about to be removed. 2852 * Doesn't call clearChildFocus, which prevents this view from taking 2853 * focus again before it has been removed from the parent 2854 */ 2855 void clearFocusForRemoval() { 2856 if ((mPrivateFlags & FOCUSED) != 0) { 2857 mPrivateFlags &= ~FOCUSED; 2858 2859 onFocusChanged(false, 0, null); 2860 refreshDrawableState(); 2861 } 2862 } 2863 2864 /** 2865 * Called internally by the view system when a new view is getting focus. 2866 * This is what clears the old focus. 2867 */ 2868 void unFocus() { 2869 if (DBG) { 2870 System.out.println(this + " unFocus()"); 2871 } 2872 2873 if ((mPrivateFlags & FOCUSED) != 0) { 2874 mPrivateFlags &= ~FOCUSED; 2875 2876 onFocusChanged(false, 0, null); 2877 refreshDrawableState(); 2878 } 2879 } 2880 2881 /** 2882 * Returns true if this view has focus iteself, or is the ancestor of the 2883 * view that has focus. 2884 * 2885 * @return True if this view has or contains focus, false otherwise. 2886 */ 2887 @ViewDebug.ExportedProperty(category = "focus") 2888 public boolean hasFocus() { 2889 return (mPrivateFlags & FOCUSED) != 0; 2890 } 2891 2892 /** 2893 * Returns true if this view is focusable or if it contains a reachable View 2894 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 2895 * is a View whose parents do not block descendants focus. 2896 * 2897 * Only {@link #VISIBLE} views are considered focusable. 2898 * 2899 * @return True if the view is focusable or if the view contains a focusable 2900 * View, false otherwise. 2901 * 2902 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 2903 */ 2904 public boolean hasFocusable() { 2905 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 2906 } 2907 2908 /** 2909 * Called by the view system when the focus state of this view changes. 2910 * When the focus change event is caused by directional navigation, direction 2911 * and previouslyFocusedRect provide insight into where the focus is coming from. 2912 * When overriding, be sure to call up through to the super class so that 2913 * the standard focus handling will occur. 2914 * 2915 * @param gainFocus True if the View has focus; false otherwise. 2916 * @param direction The direction focus has moved when requestFocus() 2917 * is called to give this view focus. Values are 2918 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT} or 2919 * {@link #FOCUS_RIGHT}. It may not always apply, in which 2920 * case use the default. 2921 * @param previouslyFocusedRect The rectangle, in this view's coordinate 2922 * system, of the previously focused view. If applicable, this will be 2923 * passed in as finer grained information about where the focus is coming 2924 * from (in addition to direction). Will be <code>null</code> otherwise. 2925 */ 2926 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 2927 if (gainFocus) { 2928 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 2929 } 2930 2931 InputMethodManager imm = InputMethodManager.peekInstance(); 2932 if (!gainFocus) { 2933 if (isPressed()) { 2934 setPressed(false); 2935 } 2936 if (imm != null && mAttachInfo != null 2937 && mAttachInfo.mHasWindowFocus) { 2938 imm.focusOut(this); 2939 } 2940 onFocusLost(); 2941 } else if (imm != null && mAttachInfo != null 2942 && mAttachInfo.mHasWindowFocus) { 2943 imm.focusIn(this); 2944 } 2945 2946 invalidate(); 2947 if (mOnFocusChangeListener != null) { 2948 mOnFocusChangeListener.onFocusChange(this, gainFocus); 2949 } 2950 2951 if (mAttachInfo != null) { 2952 mAttachInfo.mKeyDispatchState.reset(this); 2953 } 2954 } 2955 2956 /** 2957 * {@inheritDoc} 2958 */ 2959 public void sendAccessibilityEvent(int eventType) { 2960 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 2961 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 2962 } 2963 } 2964 2965 /** 2966 * {@inheritDoc} 2967 */ 2968 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 2969 event.setClassName(getClass().getName()); 2970 event.setPackageName(getContext().getPackageName()); 2971 event.setEnabled(isEnabled()); 2972 event.setContentDescription(mContentDescription); 2973 2974 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 2975 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 2976 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 2977 event.setItemCount(focusablesTempList.size()); 2978 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 2979 focusablesTempList.clear(); 2980 } 2981 2982 dispatchPopulateAccessibilityEvent(event); 2983 2984 AccessibilityManager.getInstance(mContext).sendAccessibilityEvent(event); 2985 } 2986 2987 /** 2988 * Dispatches an {@link AccessibilityEvent} to the {@link View} children 2989 * to be populated. 2990 * 2991 * @param event The event. 2992 * 2993 * @return True if the event population was completed. 2994 */ 2995 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 2996 return false; 2997 } 2998 2999 /** 3000 * Gets the {@link View} description. It briefly describes the view and is 3001 * primarily used for accessibility support. Set this property to enable 3002 * better accessibility support for your application. This is especially 3003 * true for views that do not have textual representation (For example, 3004 * ImageButton). 3005 * 3006 * @return The content descriptiopn. 3007 * 3008 * @attr ref android.R.styleable#View_contentDescription 3009 */ 3010 public CharSequence getContentDescription() { 3011 return mContentDescription; 3012 } 3013 3014 /** 3015 * Sets the {@link View} description. It briefly describes the view and is 3016 * primarily used for accessibility support. Set this property to enable 3017 * better accessibility support for your application. This is especially 3018 * true for views that do not have textual representation (For example, 3019 * ImageButton). 3020 * 3021 * @param contentDescription The content description. 3022 * 3023 * @attr ref android.R.styleable#View_contentDescription 3024 */ 3025 public void setContentDescription(CharSequence contentDescription) { 3026 mContentDescription = contentDescription; 3027 } 3028 3029 /** 3030 * Invoked whenever this view loses focus, either by losing window focus or by losing 3031 * focus within its window. This method can be used to clear any state tied to the 3032 * focus. For instance, if a button is held pressed with the trackball and the window 3033 * loses focus, this method can be used to cancel the press. 3034 * 3035 * Subclasses of View overriding this method should always call super.onFocusLost(). 3036 * 3037 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3038 * @see #onWindowFocusChanged(boolean) 3039 * 3040 * @hide pending API council approval 3041 */ 3042 protected void onFocusLost() { 3043 resetPressedState(); 3044 } 3045 3046 private void resetPressedState() { 3047 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3048 return; 3049 } 3050 3051 if (isPressed()) { 3052 setPressed(false); 3053 3054 if (!mHasPerformedLongPress) { 3055 removeLongPressCallback(); 3056 } 3057 } 3058 } 3059 3060 /** 3061 * Returns true if this view has focus 3062 * 3063 * @return True if this view has focus, false otherwise. 3064 */ 3065 @ViewDebug.ExportedProperty(category = "focus") 3066 public boolean isFocused() { 3067 return (mPrivateFlags & FOCUSED) != 0; 3068 } 3069 3070 /** 3071 * Find the view in the hierarchy rooted at this view that currently has 3072 * focus. 3073 * 3074 * @return The view that currently has focus, or null if no focused view can 3075 * be found. 3076 */ 3077 public View findFocus() { 3078 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3079 } 3080 3081 /** 3082 * Change whether this view is one of the set of scrollable containers in 3083 * its window. This will be used to determine whether the window can 3084 * resize or must pan when a soft input area is open -- scrollable 3085 * containers allow the window to use resize mode since the container 3086 * will appropriately shrink. 3087 */ 3088 public void setScrollContainer(boolean isScrollContainer) { 3089 if (isScrollContainer) { 3090 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3091 mAttachInfo.mScrollContainers.add(this); 3092 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3093 } 3094 mPrivateFlags |= SCROLL_CONTAINER; 3095 } else { 3096 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3097 mAttachInfo.mScrollContainers.remove(this); 3098 } 3099 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3100 } 3101 } 3102 3103 /** 3104 * Returns the quality of the drawing cache. 3105 * 3106 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3107 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3108 * 3109 * @see #setDrawingCacheQuality(int) 3110 * @see #setDrawingCacheEnabled(boolean) 3111 * @see #isDrawingCacheEnabled() 3112 * 3113 * @attr ref android.R.styleable#View_drawingCacheQuality 3114 */ 3115 public int getDrawingCacheQuality() { 3116 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3117 } 3118 3119 /** 3120 * Set the drawing cache quality of this view. This value is used only when the 3121 * drawing cache is enabled 3122 * 3123 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3124 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3125 * 3126 * @see #getDrawingCacheQuality() 3127 * @see #setDrawingCacheEnabled(boolean) 3128 * @see #isDrawingCacheEnabled() 3129 * 3130 * @attr ref android.R.styleable#View_drawingCacheQuality 3131 */ 3132 public void setDrawingCacheQuality(int quality) { 3133 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3134 } 3135 3136 /** 3137 * Returns whether the screen should remain on, corresponding to the current 3138 * value of {@link #KEEP_SCREEN_ON}. 3139 * 3140 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3141 * 3142 * @see #setKeepScreenOn(boolean) 3143 * 3144 * @attr ref android.R.styleable#View_keepScreenOn 3145 */ 3146 public boolean getKeepScreenOn() { 3147 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3148 } 3149 3150 /** 3151 * Controls whether the screen should remain on, modifying the 3152 * value of {@link #KEEP_SCREEN_ON}. 3153 * 3154 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3155 * 3156 * @see #getKeepScreenOn() 3157 * 3158 * @attr ref android.R.styleable#View_keepScreenOn 3159 */ 3160 public void setKeepScreenOn(boolean keepScreenOn) { 3161 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3162 } 3163 3164 /** 3165 * @return The user specified next focus ID. 3166 * 3167 * @attr ref android.R.styleable#View_nextFocusLeft 3168 */ 3169 public int getNextFocusLeftId() { 3170 return mNextFocusLeftId; 3171 } 3172 3173 /** 3174 * Set the id of the view to use for the next focus 3175 * 3176 * @param nextFocusLeftId 3177 * 3178 * @attr ref android.R.styleable#View_nextFocusLeft 3179 */ 3180 public void setNextFocusLeftId(int nextFocusLeftId) { 3181 mNextFocusLeftId = nextFocusLeftId; 3182 } 3183 3184 /** 3185 * @return The user specified next focus ID. 3186 * 3187 * @attr ref android.R.styleable#View_nextFocusRight 3188 */ 3189 public int getNextFocusRightId() { 3190 return mNextFocusRightId; 3191 } 3192 3193 /** 3194 * Set the id of the view to use for the next focus 3195 * 3196 * @param nextFocusRightId 3197 * 3198 * @attr ref android.R.styleable#View_nextFocusRight 3199 */ 3200 public void setNextFocusRightId(int nextFocusRightId) { 3201 mNextFocusRightId = nextFocusRightId; 3202 } 3203 3204 /** 3205 * @return The user specified next focus ID. 3206 * 3207 * @attr ref android.R.styleable#View_nextFocusUp 3208 */ 3209 public int getNextFocusUpId() { 3210 return mNextFocusUpId; 3211 } 3212 3213 /** 3214 * Set the id of the view to use for the next focus 3215 * 3216 * @param nextFocusUpId 3217 * 3218 * @attr ref android.R.styleable#View_nextFocusUp 3219 */ 3220 public void setNextFocusUpId(int nextFocusUpId) { 3221 mNextFocusUpId = nextFocusUpId; 3222 } 3223 3224 /** 3225 * @return The user specified next focus ID. 3226 * 3227 * @attr ref android.R.styleable#View_nextFocusDown 3228 */ 3229 public int getNextFocusDownId() { 3230 return mNextFocusDownId; 3231 } 3232 3233 /** 3234 * Set the id of the view to use for the next focus 3235 * 3236 * @param nextFocusDownId 3237 * 3238 * @attr ref android.R.styleable#View_nextFocusDown 3239 */ 3240 public void setNextFocusDownId(int nextFocusDownId) { 3241 mNextFocusDownId = nextFocusDownId; 3242 } 3243 3244 /** 3245 * Returns the visibility of this view and all of its ancestors 3246 * 3247 * @return True if this view and all of its ancestors are {@link #VISIBLE} 3248 */ 3249 public boolean isShown() { 3250 View current = this; 3251 //noinspection ConstantConditions 3252 do { 3253 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3254 return false; 3255 } 3256 ViewParent parent = current.mParent; 3257 if (parent == null) { 3258 return false; // We are not attached to the view root 3259 } 3260 if (!(parent instanceof View)) { 3261 return true; 3262 } 3263 current = (View) parent; 3264 } while (current != null); 3265 3266 return false; 3267 } 3268 3269 /** 3270 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 3271 * is set 3272 * 3273 * @param insets Insets for system windows 3274 * 3275 * @return True if this view applied the insets, false otherwise 3276 */ 3277 protected boolean fitSystemWindows(Rect insets) { 3278 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 3279 mPaddingLeft = insets.left; 3280 mPaddingTop = insets.top; 3281 mPaddingRight = insets.right; 3282 mPaddingBottom = insets.bottom; 3283 requestLayout(); 3284 return true; 3285 } 3286 return false; 3287 } 3288 3289 /** 3290 * Determine if this view has the FITS_SYSTEM_WINDOWS flag set. 3291 * @return True if window has FITS_SYSTEM_WINDOWS set 3292 * 3293 * @hide 3294 */ 3295 public boolean isFitsSystemWindowsFlagSet() { 3296 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 3297 } 3298 3299 /** 3300 * Returns the visibility status for this view. 3301 * 3302 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3303 * @attr ref android.R.styleable#View_visibility 3304 */ 3305 @ViewDebug.ExportedProperty(mapping = { 3306 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 3307 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 3308 @ViewDebug.IntToString(from = GONE, to = "GONE") 3309 }) 3310 public int getVisibility() { 3311 return mViewFlags & VISIBILITY_MASK; 3312 } 3313 3314 /** 3315 * Set the enabled state of this view. 3316 * 3317 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3318 * @attr ref android.R.styleable#View_visibility 3319 */ 3320 @RemotableViewMethod 3321 public void setVisibility(int visibility) { 3322 setFlags(visibility, VISIBILITY_MASK); 3323 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 3324 } 3325 3326 /** 3327 * Returns the enabled status for this view. The interpretation of the 3328 * enabled state varies by subclass. 3329 * 3330 * @return True if this view is enabled, false otherwise. 3331 */ 3332 @ViewDebug.ExportedProperty 3333 public boolean isEnabled() { 3334 return (mViewFlags & ENABLED_MASK) == ENABLED; 3335 } 3336 3337 /** 3338 * Set the enabled state of this view. The interpretation of the enabled 3339 * state varies by subclass. 3340 * 3341 * @param enabled True if this view is enabled, false otherwise. 3342 */ 3343 @RemotableViewMethod 3344 public void setEnabled(boolean enabled) { 3345 if (enabled == isEnabled()) return; 3346 3347 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 3348 3349 /* 3350 * The View most likely has to change its appearance, so refresh 3351 * the drawable state. 3352 */ 3353 refreshDrawableState(); 3354 3355 // Invalidate too, since the default behavior for views is to be 3356 // be drawn at 50% alpha rather than to change the drawable. 3357 invalidate(); 3358 } 3359 3360 /** 3361 * Set whether this view can receive the focus. 3362 * 3363 * Setting this to false will also ensure that this view is not focusable 3364 * in touch mode. 3365 * 3366 * @param focusable If true, this view can receive the focus. 3367 * 3368 * @see #setFocusableInTouchMode(boolean) 3369 * @attr ref android.R.styleable#View_focusable 3370 */ 3371 public void setFocusable(boolean focusable) { 3372 if (!focusable) { 3373 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 3374 } 3375 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 3376 } 3377 3378 /** 3379 * Set whether this view can receive focus while in touch mode. 3380 * 3381 * Setting this to true will also ensure that this view is focusable. 3382 * 3383 * @param focusableInTouchMode If true, this view can receive the focus while 3384 * in touch mode. 3385 * 3386 * @see #setFocusable(boolean) 3387 * @attr ref android.R.styleable#View_focusableInTouchMode 3388 */ 3389 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 3390 // Focusable in touch mode should always be set before the focusable flag 3391 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 3392 // which, in touch mode, will not successfully request focus on this view 3393 // because the focusable in touch mode flag is not set 3394 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 3395 if (focusableInTouchMode) { 3396 setFlags(FOCUSABLE, FOCUSABLE_MASK); 3397 } 3398 } 3399 3400 /** 3401 * Set whether this view should have sound effects enabled for events such as 3402 * clicking and touching. 3403 * 3404 * <p>You may wish to disable sound effects for a view if you already play sounds, 3405 * for instance, a dial key that plays dtmf tones. 3406 * 3407 * @param soundEffectsEnabled whether sound effects are enabled for this view. 3408 * @see #isSoundEffectsEnabled() 3409 * @see #playSoundEffect(int) 3410 * @attr ref android.R.styleable#View_soundEffectsEnabled 3411 */ 3412 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 3413 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 3414 } 3415 3416 /** 3417 * @return whether this view should have sound effects enabled for events such as 3418 * clicking and touching. 3419 * 3420 * @see #setSoundEffectsEnabled(boolean) 3421 * @see #playSoundEffect(int) 3422 * @attr ref android.R.styleable#View_soundEffectsEnabled 3423 */ 3424 @ViewDebug.ExportedProperty 3425 public boolean isSoundEffectsEnabled() { 3426 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 3427 } 3428 3429 /** 3430 * Set whether this view should have haptic feedback for events such as 3431 * long presses. 3432 * 3433 * <p>You may wish to disable haptic feedback if your view already controls 3434 * its own haptic feedback. 3435 * 3436 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 3437 * @see #isHapticFeedbackEnabled() 3438 * @see #performHapticFeedback(int) 3439 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3440 */ 3441 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 3442 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 3443 } 3444 3445 /** 3446 * @return whether this view should have haptic feedback enabled for events 3447 * long presses. 3448 * 3449 * @see #setHapticFeedbackEnabled(boolean) 3450 * @see #performHapticFeedback(int) 3451 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3452 */ 3453 @ViewDebug.ExportedProperty 3454 public boolean isHapticFeedbackEnabled() { 3455 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 3456 } 3457 3458 /** 3459 * If this view doesn't do any drawing on its own, set this flag to 3460 * allow further optimizations. By default, this flag is not set on 3461 * View, but could be set on some View subclasses such as ViewGroup. 3462 * 3463 * Typically, if you override {@link #onDraw} you should clear this flag. 3464 * 3465 * @param willNotDraw whether or not this View draw on its own 3466 */ 3467 public void setWillNotDraw(boolean willNotDraw) { 3468 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 3469 } 3470 3471 /** 3472 * Returns whether or not this View draws on its own. 3473 * 3474 * @return true if this view has nothing to draw, false otherwise 3475 */ 3476 @ViewDebug.ExportedProperty(category = "drawing") 3477 public boolean willNotDraw() { 3478 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 3479 } 3480 3481 /** 3482 * When a View's drawing cache is enabled, drawing is redirected to an 3483 * offscreen bitmap. Some views, like an ImageView, must be able to 3484 * bypass this mechanism if they already draw a single bitmap, to avoid 3485 * unnecessary usage of the memory. 3486 * 3487 * @param willNotCacheDrawing true if this view does not cache its 3488 * drawing, false otherwise 3489 */ 3490 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 3491 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 3492 } 3493 3494 /** 3495 * Returns whether or not this View can cache its drawing or not. 3496 * 3497 * @return true if this view does not cache its drawing, false otherwise 3498 */ 3499 @ViewDebug.ExportedProperty(category = "drawing") 3500 public boolean willNotCacheDrawing() { 3501 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 3502 } 3503 3504 /** 3505 * Indicates whether this view reacts to click events or not. 3506 * 3507 * @return true if the view is clickable, false otherwise 3508 * 3509 * @see #setClickable(boolean) 3510 * @attr ref android.R.styleable#View_clickable 3511 */ 3512 @ViewDebug.ExportedProperty 3513 public boolean isClickable() { 3514 return (mViewFlags & CLICKABLE) == CLICKABLE; 3515 } 3516 3517 /** 3518 * Enables or disables click events for this view. When a view 3519 * is clickable it will change its state to "pressed" on every click. 3520 * Subclasses should set the view clickable to visually react to 3521 * user's clicks. 3522 * 3523 * @param clickable true to make the view clickable, false otherwise 3524 * 3525 * @see #isClickable() 3526 * @attr ref android.R.styleable#View_clickable 3527 */ 3528 public void setClickable(boolean clickable) { 3529 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 3530 } 3531 3532 /** 3533 * Indicates whether this view reacts to long click events or not. 3534 * 3535 * @return true if the view is long clickable, false otherwise 3536 * 3537 * @see #setLongClickable(boolean) 3538 * @attr ref android.R.styleable#View_longClickable 3539 */ 3540 public boolean isLongClickable() { 3541 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 3542 } 3543 3544 /** 3545 * Enables or disables long click events for this view. When a view is long 3546 * clickable it reacts to the user holding down the button for a longer 3547 * duration than a tap. This event can either launch the listener or a 3548 * context menu. 3549 * 3550 * @param longClickable true to make the view long clickable, false otherwise 3551 * @see #isLongClickable() 3552 * @attr ref android.R.styleable#View_longClickable 3553 */ 3554 public void setLongClickable(boolean longClickable) { 3555 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 3556 } 3557 3558 /** 3559 * Sets the pressed state for this view. 3560 * 3561 * @see #isClickable() 3562 * @see #setClickable(boolean) 3563 * 3564 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 3565 * the View's internal state from a previously set "pressed" state. 3566 */ 3567 public void setPressed(boolean pressed) { 3568 if (pressed) { 3569 mPrivateFlags |= PRESSED; 3570 } else { 3571 mPrivateFlags &= ~PRESSED; 3572 } 3573 refreshDrawableState(); 3574 dispatchSetPressed(pressed); 3575 } 3576 3577 /** 3578 * Dispatch setPressed to all of this View's children. 3579 * 3580 * @see #setPressed(boolean) 3581 * 3582 * @param pressed The new pressed state 3583 */ 3584 protected void dispatchSetPressed(boolean pressed) { 3585 } 3586 3587 /** 3588 * Indicates whether the view is currently in pressed state. Unless 3589 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 3590 * the pressed state. 3591 * 3592 * @see #setPressed 3593 * @see #isClickable() 3594 * @see #setClickable(boolean) 3595 * 3596 * @return true if the view is currently pressed, false otherwise 3597 */ 3598 public boolean isPressed() { 3599 return (mPrivateFlags & PRESSED) == PRESSED; 3600 } 3601 3602 /** 3603 * Indicates whether this view will save its state (that is, 3604 * whether its {@link #onSaveInstanceState} method will be called). 3605 * 3606 * @return Returns true if the view state saving is enabled, else false. 3607 * 3608 * @see #setSaveEnabled(boolean) 3609 * @attr ref android.R.styleable#View_saveEnabled 3610 */ 3611 public boolean isSaveEnabled() { 3612 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 3613 } 3614 3615 /** 3616 * Controls whether the saving of this view's state is 3617 * enabled (that is, whether its {@link #onSaveInstanceState} method 3618 * will be called). Note that even if freezing is enabled, the 3619 * view still must have an id assigned to it (via {@link #setId setId()}) 3620 * for its state to be saved. This flag can only disable the 3621 * saving of this view; any child views may still have their state saved. 3622 * 3623 * @param enabled Set to false to <em>disable</em> state saving, or true 3624 * (the default) to allow it. 3625 * 3626 * @see #isSaveEnabled() 3627 * @see #setId(int) 3628 * @see #onSaveInstanceState() 3629 * @attr ref android.R.styleable#View_saveEnabled 3630 */ 3631 public void setSaveEnabled(boolean enabled) { 3632 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 3633 } 3634 3635 /** 3636 * Gets whether the framework should discard touches when the view's 3637 * window is obscured by another visible window. 3638 * Refer to the {@link View} security documentation for more details. 3639 * 3640 * @return True if touch filtering is enabled. 3641 * 3642 * @see #setFilterTouchesWhenObscured(boolean) 3643 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3644 */ 3645 @ViewDebug.ExportedProperty 3646 public boolean getFilterTouchesWhenObscured() { 3647 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 3648 } 3649 3650 /** 3651 * Sets whether the framework should discard touches when the view's 3652 * window is obscured by another visible window. 3653 * Refer to the {@link View} security documentation for more details. 3654 * 3655 * @param enabled True if touch filtering should be enabled. 3656 * 3657 * @see #getFilterTouchesWhenObscured 3658 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3659 */ 3660 public void setFilterTouchesWhenObscured(boolean enabled) { 3661 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 3662 FILTER_TOUCHES_WHEN_OBSCURED); 3663 } 3664 3665 /** 3666 * Indicates whether the entire hierarchy under this view will save its 3667 * state when a state saving traversal occurs from its parent. The default 3668 * is true; if false, these views will not be saved unless 3669 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 3670 * 3671 * @return Returns true if the view state saving from parent is enabled, else false. 3672 * 3673 * @see #setSaveFromParentEnabled(boolean) 3674 */ 3675 public boolean isSaveFromParentEnabled() { 3676 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 3677 } 3678 3679 /** 3680 * Controls whether the entire hierarchy under this view will save its 3681 * state when a state saving traversal occurs from its parent. The default 3682 * is true; if false, these views will not be saved unless 3683 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 3684 * 3685 * @param enabled Set to false to <em>disable</em> state saving, or true 3686 * (the default) to allow it. 3687 * 3688 * @see #isSaveFromParentEnabled() 3689 * @see #setId(int) 3690 * @see #onSaveInstanceState() 3691 */ 3692 public void setSaveFromParentEnabled(boolean enabled) { 3693 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 3694 } 3695 3696 3697 /** 3698 * Returns whether this View is able to take focus. 3699 * 3700 * @return True if this view can take focus, or false otherwise. 3701 * @attr ref android.R.styleable#View_focusable 3702 */ 3703 @ViewDebug.ExportedProperty(category = "focus") 3704 public final boolean isFocusable() { 3705 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 3706 } 3707 3708 /** 3709 * When a view is focusable, it may not want to take focus when in touch mode. 3710 * For example, a button would like focus when the user is navigating via a D-pad 3711 * so that the user can click on it, but once the user starts touching the screen, 3712 * the button shouldn't take focus 3713 * @return Whether the view is focusable in touch mode. 3714 * @attr ref android.R.styleable#View_focusableInTouchMode 3715 */ 3716 @ViewDebug.ExportedProperty 3717 public final boolean isFocusableInTouchMode() { 3718 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 3719 } 3720 3721 /** 3722 * Find the nearest view in the specified direction that can take focus. 3723 * This does not actually give focus to that view. 3724 * 3725 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 3726 * 3727 * @return The nearest focusable in the specified direction, or null if none 3728 * can be found. 3729 */ 3730 public View focusSearch(int direction) { 3731 if (mParent != null) { 3732 return mParent.focusSearch(this, direction); 3733 } else { 3734 return null; 3735 } 3736 } 3737 3738 /** 3739 * This method is the last chance for the focused view and its ancestors to 3740 * respond to an arrow key. This is called when the focused view did not 3741 * consume the key internally, nor could the view system find a new view in 3742 * the requested direction to give focus to. 3743 * 3744 * @param focused The currently focused view. 3745 * @param direction The direction focus wants to move. One of FOCUS_UP, 3746 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 3747 * @return True if the this view consumed this unhandled move. 3748 */ 3749 public boolean dispatchUnhandledMove(View focused, int direction) { 3750 return false; 3751 } 3752 3753 /** 3754 * If a user manually specified the next view id for a particular direction, 3755 * use the root to look up the view. Once a view is found, it is cached 3756 * for future lookups. 3757 * @param root The root view of the hierarchy containing this view. 3758 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 3759 * @return The user specified next view, or null if there is none. 3760 */ 3761 View findUserSetNextFocus(View root, int direction) { 3762 switch (direction) { 3763 case FOCUS_LEFT: 3764 if (mNextFocusLeftId == View.NO_ID) return null; 3765 return findViewShouldExist(root, mNextFocusLeftId); 3766 case FOCUS_RIGHT: 3767 if (mNextFocusRightId == View.NO_ID) return null; 3768 return findViewShouldExist(root, mNextFocusRightId); 3769 case FOCUS_UP: 3770 if (mNextFocusUpId == View.NO_ID) return null; 3771 return findViewShouldExist(root, mNextFocusUpId); 3772 case FOCUS_DOWN: 3773 if (mNextFocusDownId == View.NO_ID) return null; 3774 return findViewShouldExist(root, mNextFocusDownId); 3775 } 3776 return null; 3777 } 3778 3779 private static View findViewShouldExist(View root, int childViewId) { 3780 View result = root.findViewById(childViewId); 3781 if (result == null) { 3782 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 3783 + "by user for id " + childViewId); 3784 } 3785 return result; 3786 } 3787 3788 /** 3789 * Find and return all focusable views that are descendants of this view, 3790 * possibly including this view if it is focusable itself. 3791 * 3792 * @param direction The direction of the focus 3793 * @return A list of focusable views 3794 */ 3795 public ArrayList<View> getFocusables(int direction) { 3796 ArrayList<View> result = new ArrayList<View>(24); 3797 addFocusables(result, direction); 3798 return result; 3799 } 3800 3801 /** 3802 * Add any focusable views that are descendants of this view (possibly 3803 * including this view if it is focusable itself) to views. If we are in touch mode, 3804 * only add views that are also focusable in touch mode. 3805 * 3806 * @param views Focusable views found so far 3807 * @param direction The direction of the focus 3808 */ 3809 public void addFocusables(ArrayList<View> views, int direction) { 3810 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 3811 } 3812 3813 /** 3814 * Adds any focusable views that are descendants of this view (possibly 3815 * including this view if it is focusable itself) to views. This method 3816 * adds all focusable views regardless if we are in touch mode or 3817 * only views focusable in touch mode if we are in touch mode depending on 3818 * the focusable mode paramater. 3819 * 3820 * @param views Focusable views found so far or null if all we are interested is 3821 * the number of focusables. 3822 * @param direction The direction of the focus. 3823 * @param focusableMode The type of focusables to be added. 3824 * 3825 * @see #FOCUSABLES_ALL 3826 * @see #FOCUSABLES_TOUCH_MODE 3827 */ 3828 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 3829 if (!isFocusable()) { 3830 return; 3831 } 3832 3833 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 3834 isInTouchMode() && !isFocusableInTouchMode()) { 3835 return; 3836 } 3837 3838 if (views != null) { 3839 views.add(this); 3840 } 3841 } 3842 3843 /** 3844 * Find and return all touchable views that are descendants of this view, 3845 * possibly including this view if it is touchable itself. 3846 * 3847 * @return A list of touchable views 3848 */ 3849 public ArrayList<View> getTouchables() { 3850 ArrayList<View> result = new ArrayList<View>(); 3851 addTouchables(result); 3852 return result; 3853 } 3854 3855 /** 3856 * Add any touchable views that are descendants of this view (possibly 3857 * including this view if it is touchable itself) to views. 3858 * 3859 * @param views Touchable views found so far 3860 */ 3861 public void addTouchables(ArrayList<View> views) { 3862 final int viewFlags = mViewFlags; 3863 3864 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 3865 && (viewFlags & ENABLED_MASK) == ENABLED) { 3866 views.add(this); 3867 } 3868 } 3869 3870 /** 3871 * Call this to try to give focus to a specific view or to one of its 3872 * descendants. 3873 * 3874 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 3875 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 3876 * while the device is in touch mode. 3877 * 3878 * See also {@link #focusSearch}, which is what you call to say that you 3879 * have focus, and you want your parent to look for the next one. 3880 * 3881 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 3882 * {@link #FOCUS_DOWN} and <code>null</code>. 3883 * 3884 * @return Whether this view or one of its descendants actually took focus. 3885 */ 3886 public final boolean requestFocus() { 3887 return requestFocus(View.FOCUS_DOWN); 3888 } 3889 3890 3891 /** 3892 * Call this to try to give focus to a specific view or to one of its 3893 * descendants and give it a hint about what direction focus is heading. 3894 * 3895 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 3896 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 3897 * while the device is in touch mode. 3898 * 3899 * See also {@link #focusSearch}, which is what you call to say that you 3900 * have focus, and you want your parent to look for the next one. 3901 * 3902 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 3903 * <code>null</code> set for the previously focused rectangle. 3904 * 3905 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 3906 * @return Whether this view or one of its descendants actually took focus. 3907 */ 3908 public final boolean requestFocus(int direction) { 3909 return requestFocus(direction, null); 3910 } 3911 3912 /** 3913 * Call this to try to give focus to a specific view or to one of its descendants 3914 * and give it hints about the direction and a specific rectangle that the focus 3915 * is coming from. The rectangle can help give larger views a finer grained hint 3916 * about where focus is coming from, and therefore, where to show selection, or 3917 * forward focus change internally. 3918 * 3919 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 3920 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 3921 * while the device is in touch mode. 3922 * 3923 * A View will not take focus if it is not visible. 3924 * 3925 * A View will not take focus if one of its parents has {@link android.view.ViewGroup#getDescendantFocusability()} 3926 * equal to {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 3927 * 3928 * See also {@link #focusSearch}, which is what you call to say that you 3929 * have focus, and you want your parent to look for the next one. 3930 * 3931 * You may wish to override this method if your custom {@link View} has an internal 3932 * {@link View} that it wishes to forward the request to. 3933 * 3934 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 3935 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 3936 * to give a finer grained hint about where focus is coming from. May be null 3937 * if there is no hint. 3938 * @return Whether this view or one of its descendants actually took focus. 3939 */ 3940 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 3941 // need to be focusable 3942 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 3943 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3944 return false; 3945 } 3946 3947 // need to be focusable in touch mode if in touch mode 3948 if (isInTouchMode() && 3949 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 3950 return false; 3951 } 3952 3953 // need to not have any parents blocking us 3954 if (hasAncestorThatBlocksDescendantFocus()) { 3955 return false; 3956 } 3957 3958 handleFocusGainInternal(direction, previouslyFocusedRect); 3959 return true; 3960 } 3961 3962 /** 3963 * Call this to try to give focus to a specific view or to one of its descendants. This is a 3964 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 3965 * touch mode to request focus when they are touched. 3966 * 3967 * @return Whether this view or one of its descendants actually took focus. 3968 * 3969 * @see #isInTouchMode() 3970 * 3971 */ 3972 public final boolean requestFocusFromTouch() { 3973 // Leave touch mode if we need to 3974 if (isInTouchMode()) { 3975 View root = getRootView(); 3976 if (root != null) { 3977 ViewRoot viewRoot = (ViewRoot)root.getParent(); 3978 if (viewRoot != null) { 3979 viewRoot.ensureTouchMode(false); 3980 } 3981 } 3982 } 3983 return requestFocus(View.FOCUS_DOWN); 3984 } 3985 3986 /** 3987 * @return Whether any ancestor of this view blocks descendant focus. 3988 */ 3989 private boolean hasAncestorThatBlocksDescendantFocus() { 3990 ViewParent ancestor = mParent; 3991 while (ancestor instanceof ViewGroup) { 3992 final ViewGroup vgAncestor = (ViewGroup) ancestor; 3993 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 3994 return true; 3995 } else { 3996 ancestor = vgAncestor.getParent(); 3997 } 3998 } 3999 return false; 4000 } 4001 4002 /** 4003 * @hide 4004 */ 4005 public void dispatchStartTemporaryDetach() { 4006 onStartTemporaryDetach(); 4007 } 4008 4009 /** 4010 * This is called when a container is going to temporarily detach a child, with 4011 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4012 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4013 * {@link #onDetachedFromWindow()} when the container is done. 4014 */ 4015 public void onStartTemporaryDetach() { 4016 removeUnsetPressCallback(); 4017 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4018 } 4019 4020 /** 4021 * @hide 4022 */ 4023 public void dispatchFinishTemporaryDetach() { 4024 onFinishTemporaryDetach(); 4025 } 4026 4027 /** 4028 * Called after {@link #onStartTemporaryDetach} when the container is done 4029 * changing the view. 4030 */ 4031 public void onFinishTemporaryDetach() { 4032 } 4033 4034 /** 4035 * capture information of this view for later analysis: developement only 4036 * check dynamic switch to make sure we only dump view 4037 * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set 4038 */ 4039 private static void captureViewInfo(String subTag, View v) { 4040 if (v == null || SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) { 4041 return; 4042 } 4043 ViewDebug.dumpCapturedView(subTag, v); 4044 } 4045 4046 /** 4047 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4048 * for this view's window. Returns null if the view is not currently attached 4049 * to the window. Normally you will not need to use this directly, but 4050 * just use the standard high-level event callbacks like {@link #onKeyDown}. 4051 */ 4052 public KeyEvent.DispatcherState getKeyDispatcherState() { 4053 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4054 } 4055 4056 /** 4057 * Dispatch a key event before it is processed by any input method 4058 * associated with the view hierarchy. This can be used to intercept 4059 * key events in special situations before the IME consumes them; a 4060 * typical example would be handling the BACK key to update the application's 4061 * UI instead of allowing the IME to see it and close itself. 4062 * 4063 * @param event The key event to be dispatched. 4064 * @return True if the event was handled, false otherwise. 4065 */ 4066 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4067 return onKeyPreIme(event.getKeyCode(), event); 4068 } 4069 4070 /** 4071 * Dispatch a key event to the next view on the focus path. This path runs 4072 * from the top of the view tree down to the currently focused view. If this 4073 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4074 * the next node down the focus path. This method also fires any key 4075 * listeners. 4076 * 4077 * @param event The key event to be dispatched. 4078 * @return True if the event was handled, false otherwise. 4079 */ 4080 public boolean dispatchKeyEvent(KeyEvent event) { 4081 // If any attached key listener a first crack at the event. 4082 4083 //noinspection SimplifiableIfStatement,deprecation 4084 if (android.util.Config.LOGV) { 4085 captureViewInfo("captureViewKeyEvent", this); 4086 } 4087 4088 //noinspection SimplifiableIfStatement 4089 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4090 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4091 return true; 4092 } 4093 4094 return event.dispatch(this, mAttachInfo != null 4095 ? mAttachInfo.mKeyDispatchState : null, this); 4096 } 4097 4098 /** 4099 * Dispatches a key shortcut event. 4100 * 4101 * @param event The key event to be dispatched. 4102 * @return True if the event was handled by the view, false otherwise. 4103 */ 4104 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 4105 return onKeyShortcut(event.getKeyCode(), event); 4106 } 4107 4108 /** 4109 * Pass the touch screen motion event down to the target view, or this 4110 * view if it is the target. 4111 * 4112 * @param event The motion event to be dispatched. 4113 * @return True if the event was handled by the view, false otherwise. 4114 */ 4115 public boolean dispatchTouchEvent(MotionEvent event) { 4116 if (!onFilterTouchEventForSecurity(event)) { 4117 return false; 4118 } 4119 4120 //noinspection SimplifiableIfStatement 4121 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 4122 mOnTouchListener.onTouch(this, event)) { 4123 return true; 4124 } 4125 return onTouchEvent(event); 4126 } 4127 4128 /** 4129 * Filter the touch event to apply security policies. 4130 * 4131 * @param event The motion event to be filtered. 4132 * @return True if the event should be dispatched, false if the event should be dropped. 4133 * 4134 * @see #getFilterTouchesWhenObscured 4135 */ 4136 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 4137 //noinspection RedundantIfStatement 4138 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 4139 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 4140 // Window is obscured, drop this touch. 4141 return false; 4142 } 4143 return true; 4144 } 4145 4146 /** 4147 * Pass a trackball motion event down to the focused view. 4148 * 4149 * @param event The motion event to be dispatched. 4150 * @return True if the event was handled by the view, false otherwise. 4151 */ 4152 public boolean dispatchTrackballEvent(MotionEvent event) { 4153 //Log.i("view", "view=" + this + ", " + event.toString()); 4154 return onTrackballEvent(event); 4155 } 4156 4157 /** 4158 * Called when the window containing this view gains or loses window focus. 4159 * ViewGroups should override to route to their children. 4160 * 4161 * @param hasFocus True if the window containing this view now has focus, 4162 * false otherwise. 4163 */ 4164 public void dispatchWindowFocusChanged(boolean hasFocus) { 4165 onWindowFocusChanged(hasFocus); 4166 } 4167 4168 /** 4169 * Called when the window containing this view gains or loses focus. Note 4170 * that this is separate from view focus: to receive key events, both 4171 * your view and its window must have focus. If a window is displayed 4172 * on top of yours that takes input focus, then your own window will lose 4173 * focus but the view focus will remain unchanged. 4174 * 4175 * @param hasWindowFocus True if the window containing this view now has 4176 * focus, false otherwise. 4177 */ 4178 public void onWindowFocusChanged(boolean hasWindowFocus) { 4179 InputMethodManager imm = InputMethodManager.peekInstance(); 4180 if (!hasWindowFocus) { 4181 if (isPressed()) { 4182 setPressed(false); 4183 } 4184 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4185 imm.focusOut(this); 4186 } 4187 removeLongPressCallback(); 4188 removeTapCallback(); 4189 onFocusLost(); 4190 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4191 imm.focusIn(this); 4192 } 4193 refreshDrawableState(); 4194 } 4195 4196 /** 4197 * Returns true if this view is in a window that currently has window focus. 4198 * Note that this is not the same as the view itself having focus. 4199 * 4200 * @return True if this view is in a window that currently has window focus. 4201 */ 4202 public boolean hasWindowFocus() { 4203 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 4204 } 4205 4206 /** 4207 * Dispatch a view visibility change down the view hierarchy. 4208 * ViewGroups should override to route to their children. 4209 * @param changedView The view whose visibility changed. Could be 'this' or 4210 * an ancestor view. 4211 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4212 * {@link #INVISIBLE} or {@link #GONE}. 4213 */ 4214 protected void dispatchVisibilityChanged(View changedView, int visibility) { 4215 onVisibilityChanged(changedView, visibility); 4216 } 4217 4218 /** 4219 * Called when the visibility of the view or an ancestor of the view is changed. 4220 * @param changedView The view whose visibility changed. Could be 'this' or 4221 * an ancestor view. 4222 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4223 * {@link #INVISIBLE} or {@link #GONE}. 4224 */ 4225 protected void onVisibilityChanged(View changedView, int visibility) { 4226 if (visibility == VISIBLE) { 4227 if (mAttachInfo != null) { 4228 initialAwakenScrollBars(); 4229 } else { 4230 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 4231 } 4232 } 4233 } 4234 4235 /** 4236 * Dispatch a hint about whether this view is displayed. For instance, when 4237 * a View moves out of the screen, it might receives a display hint indicating 4238 * the view is not displayed. Applications should not <em>rely</em> on this hint 4239 * as there is no guarantee that they will receive one. 4240 * 4241 * @param hint A hint about whether or not this view is displayed: 4242 * {@link #VISIBLE} or {@link #INVISIBLE}. 4243 */ 4244 public void dispatchDisplayHint(int hint) { 4245 onDisplayHint(hint); 4246 } 4247 4248 /** 4249 * Gives this view a hint about whether is displayed or not. For instance, when 4250 * a View moves out of the screen, it might receives a display hint indicating 4251 * the view is not displayed. Applications should not <em>rely</em> on this hint 4252 * as there is no guarantee that they will receive one. 4253 * 4254 * @param hint A hint about whether or not this view is displayed: 4255 * {@link #VISIBLE} or {@link #INVISIBLE}. 4256 */ 4257 protected void onDisplayHint(int hint) { 4258 } 4259 4260 /** 4261 * Dispatch a window visibility change down the view hierarchy. 4262 * ViewGroups should override to route to their children. 4263 * 4264 * @param visibility The new visibility of the window. 4265 * 4266 * @see #onWindowVisibilityChanged 4267 */ 4268 public void dispatchWindowVisibilityChanged(int visibility) { 4269 onWindowVisibilityChanged(visibility); 4270 } 4271 4272 /** 4273 * Called when the window containing has change its visibility 4274 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 4275 * that this tells you whether or not your window is being made visible 4276 * to the window manager; this does <em>not</em> tell you whether or not 4277 * your window is obscured by other windows on the screen, even if it 4278 * is itself visible. 4279 * 4280 * @param visibility The new visibility of the window. 4281 */ 4282 protected void onWindowVisibilityChanged(int visibility) { 4283 if (visibility == VISIBLE) { 4284 initialAwakenScrollBars(); 4285 } 4286 } 4287 4288 /** 4289 * Returns the current visibility of the window this view is attached to 4290 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 4291 * 4292 * @return Returns the current visibility of the view's window. 4293 */ 4294 public int getWindowVisibility() { 4295 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 4296 } 4297 4298 /** 4299 * Retrieve the overall visible display size in which the window this view is 4300 * attached to has been positioned in. This takes into account screen 4301 * decorations above the window, for both cases where the window itself 4302 * is being position inside of them or the window is being placed under 4303 * then and covered insets are used for the window to position its content 4304 * inside. In effect, this tells you the available area where content can 4305 * be placed and remain visible to users. 4306 * 4307 * <p>This function requires an IPC back to the window manager to retrieve 4308 * the requested information, so should not be used in performance critical 4309 * code like drawing. 4310 * 4311 * @param outRect Filled in with the visible display frame. If the view 4312 * is not attached to a window, this is simply the raw display size. 4313 */ 4314 public void getWindowVisibleDisplayFrame(Rect outRect) { 4315 if (mAttachInfo != null) { 4316 try { 4317 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 4318 } catch (RemoteException e) { 4319 return; 4320 } 4321 // XXX This is really broken, and probably all needs to be done 4322 // in the window manager, and we need to know more about whether 4323 // we want the area behind or in front of the IME. 4324 final Rect insets = mAttachInfo.mVisibleInsets; 4325 outRect.left += insets.left; 4326 outRect.top += insets.top; 4327 outRect.right -= insets.right; 4328 outRect.bottom -= insets.bottom; 4329 return; 4330 } 4331 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 4332 outRect.set(0, 0, d.getWidth(), d.getHeight()); 4333 } 4334 4335 /** 4336 * Dispatch a notification about a resource configuration change down 4337 * the view hierarchy. 4338 * ViewGroups should override to route to their children. 4339 * 4340 * @param newConfig The new resource configuration. 4341 * 4342 * @see #onConfigurationChanged 4343 */ 4344 public void dispatchConfigurationChanged(Configuration newConfig) { 4345 onConfigurationChanged(newConfig); 4346 } 4347 4348 /** 4349 * Called when the current configuration of the resources being used 4350 * by the application have changed. You can use this to decide when 4351 * to reload resources that can changed based on orientation and other 4352 * configuration characterstics. You only need to use this if you are 4353 * not relying on the normal {@link android.app.Activity} mechanism of 4354 * recreating the activity instance upon a configuration change. 4355 * 4356 * @param newConfig The new resource configuration. 4357 */ 4358 protected void onConfigurationChanged(Configuration newConfig) { 4359 } 4360 4361 /** 4362 * Private function to aggregate all per-view attributes in to the view 4363 * root. 4364 */ 4365 void dispatchCollectViewAttributes(int visibility) { 4366 performCollectViewAttributes(visibility); 4367 } 4368 4369 void performCollectViewAttributes(int visibility) { 4370 //noinspection PointlessBitwiseExpression 4371 if (((visibility | mViewFlags) & (VISIBILITY_MASK | KEEP_SCREEN_ON)) 4372 == (VISIBLE | KEEP_SCREEN_ON)) { 4373 mAttachInfo.mKeepScreenOn = true; 4374 } 4375 } 4376 4377 void needGlobalAttributesUpdate(boolean force) { 4378 AttachInfo ai = mAttachInfo; 4379 if (ai != null) { 4380 if (ai.mKeepScreenOn || force) { 4381 ai.mRecomputeGlobalAttributes = true; 4382 } 4383 } 4384 } 4385 4386 /** 4387 * Returns whether the device is currently in touch mode. Touch mode is entered 4388 * once the user begins interacting with the device by touch, and affects various 4389 * things like whether focus is always visible to the user. 4390 * 4391 * @return Whether the device is in touch mode. 4392 */ 4393 @ViewDebug.ExportedProperty 4394 public boolean isInTouchMode() { 4395 if (mAttachInfo != null) { 4396 return mAttachInfo.mInTouchMode; 4397 } else { 4398 return ViewRoot.isInTouchMode(); 4399 } 4400 } 4401 4402 /** 4403 * Returns the context the view is running in, through which it can 4404 * access the current theme, resources, etc. 4405 * 4406 * @return The view's Context. 4407 */ 4408 @ViewDebug.CapturedViewProperty 4409 public final Context getContext() { 4410 return mContext; 4411 } 4412 4413 /** 4414 * Handle a key event before it is processed by any input method 4415 * associated with the view hierarchy. This can be used to intercept 4416 * key events in special situations before the IME consumes them; a 4417 * typical example would be handling the BACK key to update the application's 4418 * UI instead of allowing the IME to see it and close itself. 4419 * 4420 * @param keyCode The value in event.getKeyCode(). 4421 * @param event Description of the key event. 4422 * @return If you handled the event, return true. If you want to allow the 4423 * event to be handled by the next receiver, return false. 4424 */ 4425 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 4426 return false; 4427 } 4428 4429 /** 4430 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 4431 * KeyEvent.Callback.onKeyMultiple()}: perform press of the view 4432 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 4433 * is released, if the view is enabled and clickable. 4434 * 4435 * @param keyCode A key code that represents the button pressed, from 4436 * {@link android.view.KeyEvent}. 4437 * @param event The KeyEvent object that defines the button action. 4438 */ 4439 public boolean onKeyDown(int keyCode, KeyEvent event) { 4440 boolean result = false; 4441 4442 switch (keyCode) { 4443 case KeyEvent.KEYCODE_DPAD_CENTER: 4444 case KeyEvent.KEYCODE_ENTER: { 4445 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4446 return true; 4447 } 4448 // Long clickable items don't necessarily have to be clickable 4449 if (((mViewFlags & CLICKABLE) == CLICKABLE || 4450 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 4451 (event.getRepeatCount() == 0)) { 4452 setPressed(true); 4453 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 4454 postCheckForLongClick(0); 4455 } 4456 return true; 4457 } 4458 break; 4459 } 4460 } 4461 return result; 4462 } 4463 4464 /** 4465 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 4466 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 4467 * the event). 4468 */ 4469 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 4470 return false; 4471 } 4472 4473 /** 4474 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 4475 * KeyEvent.Callback.onKeyMultiple()}: perform clicking of the view 4476 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 4477 * {@link KeyEvent#KEYCODE_ENTER} is released. 4478 * 4479 * @param keyCode A key code that represents the button pressed, from 4480 * {@link android.view.KeyEvent}. 4481 * @param event The KeyEvent object that defines the button action. 4482 */ 4483 public boolean onKeyUp(int keyCode, KeyEvent event) { 4484 boolean result = false; 4485 4486 switch (keyCode) { 4487 case KeyEvent.KEYCODE_DPAD_CENTER: 4488 case KeyEvent.KEYCODE_ENTER: { 4489 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4490 return true; 4491 } 4492 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 4493 setPressed(false); 4494 4495 if (!mHasPerformedLongPress) { 4496 // This is a tap, so remove the longpress check 4497 removeLongPressCallback(); 4498 4499 result = performClick(); 4500 } 4501 } 4502 break; 4503 } 4504 } 4505 return result; 4506 } 4507 4508 /** 4509 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 4510 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 4511 * the event). 4512 * 4513 * @param keyCode A key code that represents the button pressed, from 4514 * {@link android.view.KeyEvent}. 4515 * @param repeatCount The number of times the action was made. 4516 * @param event The KeyEvent object that defines the button action. 4517 */ 4518 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 4519 return false; 4520 } 4521 4522 /** 4523 * Called when an unhandled key shortcut event occurs. 4524 * 4525 * @param keyCode The value in event.getKeyCode(). 4526 * @param event Description of the key event. 4527 * @return If you handled the event, return true. If you want to allow the 4528 * event to be handled by the next receiver, return false. 4529 */ 4530 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 4531 return false; 4532 } 4533 4534 /** 4535 * Check whether the called view is a text editor, in which case it 4536 * would make sense to automatically display a soft input window for 4537 * it. Subclasses should override this if they implement 4538 * {@link #onCreateInputConnection(EditorInfo)} to return true if 4539 * a call on that method would return a non-null InputConnection, and 4540 * they are really a first-class editor that the user would normally 4541 * start typing on when the go into a window containing your view. 4542 * 4543 * <p>The default implementation always returns false. This does 4544 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 4545 * will not be called or the user can not otherwise perform edits on your 4546 * view; it is just a hint to the system that this is not the primary 4547 * purpose of this view. 4548 * 4549 * @return Returns true if this view is a text editor, else false. 4550 */ 4551 public boolean onCheckIsTextEditor() { 4552 return false; 4553 } 4554 4555 /** 4556 * Create a new InputConnection for an InputMethod to interact 4557 * with the view. The default implementation returns null, since it doesn't 4558 * support input methods. You can override this to implement such support. 4559 * This is only needed for views that take focus and text input. 4560 * 4561 * <p>When implementing this, you probably also want to implement 4562 * {@link #onCheckIsTextEditor()} to indicate you will return a 4563 * non-null InputConnection. 4564 * 4565 * @param outAttrs Fill in with attribute information about the connection. 4566 */ 4567 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 4568 return null; 4569 } 4570 4571 /** 4572 * Called by the {@link android.view.inputmethod.InputMethodManager} 4573 * when a view who is not the current 4574 * input connection target is trying to make a call on the manager. The 4575 * default implementation returns false; you can override this to return 4576 * true for certain views if you are performing InputConnection proxying 4577 * to them. 4578 * @param view The View that is making the InputMethodManager call. 4579 * @return Return true to allow the call, false to reject. 4580 */ 4581 public boolean checkInputConnectionProxy(View view) { 4582 return false; 4583 } 4584 4585 /** 4586 * Show the context menu for this view. It is not safe to hold on to the 4587 * menu after returning from this method. 4588 * 4589 * You should normally not overload this method. Overload 4590 * {@link #onCreateContextMenu(ContextMenu)} or define an 4591 * {@link OnCreateContextMenuListener} to add items to the context menu. 4592 * 4593 * @param menu The context menu to populate 4594 */ 4595 public void createContextMenu(ContextMenu menu) { 4596 ContextMenuInfo menuInfo = getContextMenuInfo(); 4597 4598 // Sets the current menu info so all items added to menu will have 4599 // my extra info set. 4600 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 4601 4602 onCreateContextMenu(menu); 4603 if (mOnCreateContextMenuListener != null) { 4604 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 4605 } 4606 4607 // Clear the extra information so subsequent items that aren't mine don't 4608 // have my extra info. 4609 ((MenuBuilder)menu).setCurrentMenuInfo(null); 4610 4611 if (mParent != null) { 4612 mParent.createContextMenu(menu); 4613 } 4614 } 4615 4616 /** 4617 * Views should implement this if they have extra information to associate 4618 * with the context menu. The return result is supplied as a parameter to 4619 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 4620 * callback. 4621 * 4622 * @return Extra information about the item for which the context menu 4623 * should be shown. This information will vary across different 4624 * subclasses of View. 4625 */ 4626 protected ContextMenuInfo getContextMenuInfo() { 4627 return null; 4628 } 4629 4630 /** 4631 * Views should implement this if the view itself is going to add items to 4632 * the context menu. 4633 * 4634 * @param menu the context menu to populate 4635 */ 4636 protected void onCreateContextMenu(ContextMenu menu) { 4637 } 4638 4639 /** 4640 * Implement this method to handle trackball motion events. The 4641 * <em>relative</em> movement of the trackball since the last event 4642 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 4643 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 4644 * that a movement of 1 corresponds to the user pressing one DPAD key (so 4645 * they will often be fractional values, representing the more fine-grained 4646 * movement information available from a trackball). 4647 * 4648 * @param event The motion event. 4649 * @return True if the event was handled, false otherwise. 4650 */ 4651 public boolean onTrackballEvent(MotionEvent event) { 4652 return false; 4653 } 4654 4655 /** 4656 * Implement this method to handle touch screen motion events. 4657 * 4658 * @param event The motion event. 4659 * @return True if the event was handled, false otherwise. 4660 */ 4661 public boolean onTouchEvent(MotionEvent event) { 4662 final int viewFlags = mViewFlags; 4663 4664 if ((viewFlags & ENABLED_MASK) == DISABLED) { 4665 // A disabled view that is clickable still consumes the touch 4666 // events, it just doesn't respond to them. 4667 return (((viewFlags & CLICKABLE) == CLICKABLE || 4668 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 4669 } 4670 4671 if (mTouchDelegate != null) { 4672 if (mTouchDelegate.onTouchEvent(event)) { 4673 return true; 4674 } 4675 } 4676 4677 if (((viewFlags & CLICKABLE) == CLICKABLE || 4678 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 4679 switch (event.getAction()) { 4680 case MotionEvent.ACTION_UP: 4681 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 4682 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 4683 // take focus if we don't have it already and we should in 4684 // touch mode. 4685 boolean focusTaken = false; 4686 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 4687 focusTaken = requestFocus(); 4688 } 4689 4690 if (!mHasPerformedLongPress) { 4691 // This is a tap, so remove the longpress check 4692 removeLongPressCallback(); 4693 4694 // Only perform take click actions if we were in the pressed state 4695 if (!focusTaken) { 4696 // Use a Runnable and post this rather than calling 4697 // performClick directly. This lets other visual state 4698 // of the view update before click actions start. 4699 if (mPerformClick == null) { 4700 mPerformClick = new PerformClick(); 4701 } 4702 if (!post(mPerformClick)) { 4703 performClick(); 4704 } 4705 } 4706 } 4707 4708 if (mUnsetPressedState == null) { 4709 mUnsetPressedState = new UnsetPressedState(); 4710 } 4711 4712 if (prepressed) { 4713 mPrivateFlags |= PRESSED; 4714 refreshDrawableState(); 4715 postDelayed(mUnsetPressedState, 4716 ViewConfiguration.getPressedStateDuration()); 4717 } else if (!post(mUnsetPressedState)) { 4718 // If the post failed, unpress right now 4719 mUnsetPressedState.run(); 4720 } 4721 removeTapCallback(); 4722 } 4723 break; 4724 4725 case MotionEvent.ACTION_DOWN: 4726 if (mPendingCheckForTap == null) { 4727 mPendingCheckForTap = new CheckForTap(); 4728 } 4729 mPrivateFlags |= PREPRESSED; 4730 mHasPerformedLongPress = false; 4731 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 4732 break; 4733 4734 case MotionEvent.ACTION_CANCEL: 4735 mPrivateFlags &= ~PRESSED; 4736 refreshDrawableState(); 4737 removeTapCallback(); 4738 break; 4739 4740 case MotionEvent.ACTION_MOVE: 4741 final int x = (int) event.getX(); 4742 final int y = (int) event.getY(); 4743 4744 // Be lenient about moving outside of buttons 4745 if (!pointInView(x, y, mTouchSlop)) { 4746 // Outside button 4747 removeTapCallback(); 4748 if ((mPrivateFlags & PRESSED) != 0) { 4749 // Remove any future long press/tap checks 4750 removeLongPressCallback(); 4751 4752 // Need to switch from pressed to not pressed 4753 mPrivateFlags &= ~PRESSED; 4754 refreshDrawableState(); 4755 } 4756 } 4757 break; 4758 } 4759 return true; 4760 } 4761 4762 return false; 4763 } 4764 4765 /** 4766 * Remove the longpress detection timer. 4767 */ 4768 private void removeLongPressCallback() { 4769 if (mPendingCheckForLongPress != null) { 4770 removeCallbacks(mPendingCheckForLongPress); 4771 } 4772 } 4773 4774 /** 4775 * Remove the prepress detection timer. 4776 */ 4777 private void removeUnsetPressCallback() { 4778 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 4779 setPressed(false); 4780 removeCallbacks(mUnsetPressedState); 4781 } 4782 } 4783 4784 /** 4785 * Remove the tap detection timer. 4786 */ 4787 private void removeTapCallback() { 4788 if (mPendingCheckForTap != null) { 4789 mPrivateFlags &= ~PREPRESSED; 4790 removeCallbacks(mPendingCheckForTap); 4791 } 4792 } 4793 4794 /** 4795 * Cancels a pending long press. Your subclass can use this if you 4796 * want the context menu to come up if the user presses and holds 4797 * at the same place, but you don't want it to come up if they press 4798 * and then move around enough to cause scrolling. 4799 */ 4800 public void cancelLongPress() { 4801 removeLongPressCallback(); 4802 4803 /* 4804 * The prepressed state handled by the tap callback is a display 4805 * construct, but the tap callback will post a long press callback 4806 * less its own timeout. Remove it here. 4807 */ 4808 removeTapCallback(); 4809 } 4810 4811 /** 4812 * Sets the TouchDelegate for this View. 4813 */ 4814 public void setTouchDelegate(TouchDelegate delegate) { 4815 mTouchDelegate = delegate; 4816 } 4817 4818 /** 4819 * Gets the TouchDelegate for this View. 4820 */ 4821 public TouchDelegate getTouchDelegate() { 4822 return mTouchDelegate; 4823 } 4824 4825 /** 4826 * Set flags controlling behavior of this view. 4827 * 4828 * @param flags Constant indicating the value which should be set 4829 * @param mask Constant indicating the bit range that should be changed 4830 */ 4831 void setFlags(int flags, int mask) { 4832 int old = mViewFlags; 4833 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 4834 4835 int changed = mViewFlags ^ old; 4836 if (changed == 0) { 4837 return; 4838 } 4839 int privateFlags = mPrivateFlags; 4840 4841 /* Check if the FOCUSABLE bit has changed */ 4842 if (((changed & FOCUSABLE_MASK) != 0) && 4843 ((privateFlags & HAS_BOUNDS) !=0)) { 4844 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 4845 && ((privateFlags & FOCUSED) != 0)) { 4846 /* Give up focus if we are no longer focusable */ 4847 clearFocus(); 4848 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 4849 && ((privateFlags & FOCUSED) == 0)) { 4850 /* 4851 * Tell the view system that we are now available to take focus 4852 * if no one else already has it. 4853 */ 4854 if (mParent != null) mParent.focusableViewAvailable(this); 4855 } 4856 } 4857 4858 if ((flags & VISIBILITY_MASK) == VISIBLE) { 4859 if ((changed & VISIBILITY_MASK) != 0) { 4860 /* 4861 * If this view is becoming visible, set the DRAWN flag so that 4862 * the next invalidate() will not be skipped. 4863 */ 4864 mPrivateFlags |= DRAWN; 4865 4866 needGlobalAttributesUpdate(true); 4867 4868 // a view becoming visible is worth notifying the parent 4869 // about in case nothing has focus. even if this specific view 4870 // isn't focusable, it may contain something that is, so let 4871 // the root view try to give this focus if nothing else does. 4872 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 4873 mParent.focusableViewAvailable(this); 4874 } 4875 } 4876 } 4877 4878 /* Check if the GONE bit has changed */ 4879 if ((changed & GONE) != 0) { 4880 needGlobalAttributesUpdate(false); 4881 requestLayout(); 4882 invalidate(); 4883 4884 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 4885 if (hasFocus()) clearFocus(); 4886 destroyDrawingCache(); 4887 } 4888 if (mAttachInfo != null) { 4889 mAttachInfo.mViewVisibilityChanged = true; 4890 } 4891 } 4892 4893 /* Check if the VISIBLE bit has changed */ 4894 if ((changed & INVISIBLE) != 0) { 4895 needGlobalAttributesUpdate(false); 4896 invalidate(); 4897 4898 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 4899 // root view becoming invisible shouldn't clear focus 4900 if (getRootView() != this) { 4901 clearFocus(); 4902 } 4903 } 4904 if (mAttachInfo != null) { 4905 mAttachInfo.mViewVisibilityChanged = true; 4906 } 4907 } 4908 4909 if ((changed & VISIBILITY_MASK) != 0) { 4910 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 4911 } 4912 4913 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 4914 destroyDrawingCache(); 4915 } 4916 4917 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 4918 destroyDrawingCache(); 4919 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4920 } 4921 4922 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 4923 destroyDrawingCache(); 4924 mPrivateFlags &= ~DRAWING_CACHE_VALID; 4925 } 4926 4927 if ((changed & DRAW_MASK) != 0) { 4928 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 4929 if (mBGDrawable != null) { 4930 mPrivateFlags &= ~SKIP_DRAW; 4931 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 4932 } else { 4933 mPrivateFlags |= SKIP_DRAW; 4934 } 4935 } else { 4936 mPrivateFlags &= ~SKIP_DRAW; 4937 } 4938 requestLayout(); 4939 invalidate(); 4940 } 4941 4942 if ((changed & KEEP_SCREEN_ON) != 0) { 4943 if (mParent != null) { 4944 mParent.recomputeViewAttributes(this); 4945 } 4946 } 4947 } 4948 4949 /** 4950 * Change the view's z order in the tree, so it's on top of other sibling 4951 * views 4952 */ 4953 public void bringToFront() { 4954 if (mParent != null) { 4955 mParent.bringChildToFront(this); 4956 } 4957 } 4958 4959 /** 4960 * This is called in response to an internal scroll in this view (i.e., the 4961 * view scrolled its own contents). This is typically as a result of 4962 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 4963 * called. 4964 * 4965 * @param l Current horizontal scroll origin. 4966 * @param t Current vertical scroll origin. 4967 * @param oldl Previous horizontal scroll origin. 4968 * @param oldt Previous vertical scroll origin. 4969 */ 4970 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 4971 mBackgroundSizeChanged = true; 4972 4973 final AttachInfo ai = mAttachInfo; 4974 if (ai != null) { 4975 ai.mViewScrollChanged = true; 4976 } 4977 } 4978 4979 /** 4980 * Interface definition for a callback to be invoked when the layout bounds of a view 4981 * changes due to layout processing. 4982 */ 4983 public interface OnLayoutChangeListener { 4984 /** 4985 * Called when the focus state of a view has changed. 4986 * 4987 * @param v The view whose state has changed. 4988 * @param left The new value of the view's left property. 4989 * @param top The new value of the view's top property. 4990 * @param right The new value of the view's right property. 4991 * @param bottom The new value of the view's bottom property. 4992 * @param oldLeft The previous value of the view's left property. 4993 * @param oldTop The previous value of the view's top property. 4994 * @param oldRight The previous value of the view's right property. 4995 * @param oldBottom The previous value of the view's bottom property. 4996 */ 4997 void onLayoutChange(View v, int left, int top, int right, int bottom, 4998 int oldLeft, int oldTop, int oldRight, int oldBottom); 4999 } 5000 5001 /** 5002 * This is called during layout when the size of this view has changed. If 5003 * you were just added to the view hierarchy, you're called with the old 5004 * values of 0. 5005 * 5006 * @param w Current width of this view. 5007 * @param h Current height of this view. 5008 * @param oldw Old width of this view. 5009 * @param oldh Old height of this view. 5010 */ 5011 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 5012 } 5013 5014 /** 5015 * Called by draw to draw the child views. This may be overridden 5016 * by derived classes to gain control just before its children are drawn 5017 * (but after its own view has been drawn). 5018 * @param canvas the canvas on which to draw the view 5019 */ 5020 protected void dispatchDraw(Canvas canvas) { 5021 } 5022 5023 /** 5024 * Gets the parent of this view. Note that the parent is a 5025 * ViewParent and not necessarily a View. 5026 * 5027 * @return Parent of this view. 5028 */ 5029 public final ViewParent getParent() { 5030 return mParent; 5031 } 5032 5033 /** 5034 * Return the scrolled left position of this view. This is the left edge of 5035 * the displayed part of your view. You do not need to draw any pixels 5036 * farther left, since those are outside of the frame of your view on 5037 * screen. 5038 * 5039 * @return The left edge of the displayed part of your view, in pixels. 5040 */ 5041 public final int getScrollX() { 5042 return mScrollX; 5043 } 5044 5045 /** 5046 * Return the scrolled top position of this view. This is the top edge of 5047 * the displayed part of your view. You do not need to draw any pixels above 5048 * it, since those are outside of the frame of your view on screen. 5049 * 5050 * @return The top edge of the displayed part of your view, in pixels. 5051 */ 5052 public final int getScrollY() { 5053 return mScrollY; 5054 } 5055 5056 /** 5057 * Return the width of the your view. 5058 * 5059 * @return The width of your view, in pixels. 5060 */ 5061 @ViewDebug.ExportedProperty(category = "layout") 5062 public final int getWidth() { 5063 return mRight - mLeft; 5064 } 5065 5066 /** 5067 * Return the height of your view. 5068 * 5069 * @return The height of your view, in pixels. 5070 */ 5071 @ViewDebug.ExportedProperty(category = "layout") 5072 public final int getHeight() { 5073 return mBottom - mTop; 5074 } 5075 5076 /** 5077 * Return the visible drawing bounds of your view. Fills in the output 5078 * rectangle with the values from getScrollX(), getScrollY(), 5079 * getWidth(), and getHeight(). 5080 * 5081 * @param outRect The (scrolled) drawing bounds of the view. 5082 */ 5083 public void getDrawingRect(Rect outRect) { 5084 outRect.left = mScrollX; 5085 outRect.top = mScrollY; 5086 outRect.right = mScrollX + (mRight - mLeft); 5087 outRect.bottom = mScrollY + (mBottom - mTop); 5088 } 5089 5090 /** 5091 * The width of this view as measured in the most recent call to measure(). 5092 * This should be used during measurement and layout calculations only. Use 5093 * {@link #getWidth()} to see how wide a view is after layout. 5094 * 5095 * @return The measured width of this view. 5096 */ 5097 public final int getMeasuredWidth() { 5098 return mMeasuredWidth; 5099 } 5100 5101 /** 5102 * The height of this view as measured in the most recent call to measure(). 5103 * This should be used during measurement and layout calculations only. Use 5104 * {@link #getHeight()} to see how tall a view is after layout. 5105 * 5106 * @return The measured height of this view. 5107 */ 5108 public final int getMeasuredHeight() { 5109 return mMeasuredHeight; 5110 } 5111 5112 /** 5113 * The transform matrix of this view, which is calculated based on the current 5114 * roation, scale, and pivot properties. 5115 * 5116 * @see #getRotation() 5117 * @see #getScaleX() 5118 * @see #getScaleY() 5119 * @see #getPivotX() 5120 * @see #getPivotY() 5121 * @return The current transform matrix for the view 5122 */ 5123 public Matrix getMatrix() { 5124 hasIdentityMatrix(); 5125 return mMatrix; 5126 } 5127 5128 /** 5129 * Utility function to determine if the value is far enough away from zero to be 5130 * considered non-zero. 5131 * @param value A floating point value to check for zero-ness 5132 * @return whether the passed-in value is far enough away from zero to be considered non-zero 5133 */ 5134 private static boolean nonzero(float value) { 5135 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 5136 } 5137 5138 /** 5139 * Recomputes the transform matrix if necessary. 5140 * 5141 * @return True if the transform matrix is the identity matrix, false otherwise. 5142 */ 5143 boolean hasIdentityMatrix() { 5144 if (mMatrixDirty) { 5145 // transform-related properties have changed since the last time someone 5146 // asked for the matrix; recalculate it with the current values 5147 5148 // Figure out if we need to update the pivot point 5149 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5150 if ((mRight - mLeft) != mPrevWidth && (mBottom - mTop) != mPrevHeight) { 5151 mPrevWidth = mRight - mLeft; 5152 mPrevHeight = mBottom - mTop; 5153 mPivotX = (float) mPrevWidth / 2f; 5154 mPivotY = (float) mPrevHeight / 2f; 5155 } 5156 } 5157 mMatrix.reset(); 5158 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 5159 mMatrix.setTranslate(mTranslationX, mTranslationY); 5160 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 5161 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5162 } else { 5163 if (mCamera == null) { 5164 mCamera = new Camera(); 5165 matrix3D = new Matrix(); 5166 } 5167 mCamera.save(); 5168 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5169 mCamera.rotateX(mRotationX); 5170 mCamera.rotateY(mRotationY); 5171 mCamera.rotateZ(-mRotation); 5172 mCamera.getMatrix(matrix3D); 5173 matrix3D.preTranslate(-mPivotX, -mPivotY); 5174 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 5175 mMatrix.postConcat(matrix3D); 5176 mCamera.restore(); 5177 } 5178 mMatrixDirty = false; 5179 mMatrixIsIdentity = mMatrix.isIdentity(); 5180 mInverseMatrixDirty = true; 5181 } 5182 return mMatrixIsIdentity; 5183 } 5184 5185 /** 5186 * Utility method to retrieve the inverse of the current mMatrix property. 5187 * We cache the matrix to avoid recalculating it when transform properties 5188 * have not changed. 5189 * 5190 * @return The inverse of the current matrix of this view. 5191 */ 5192 Matrix getInverseMatrix() { 5193 if (mInverseMatrixDirty) { 5194 if (mInverseMatrix == null) { 5195 mInverseMatrix = new Matrix(); 5196 } 5197 mMatrix.invert(mInverseMatrix); 5198 mInverseMatrixDirty = false; 5199 } 5200 return mInverseMatrix; 5201 } 5202 5203 /** 5204 * The degrees that the view is rotated around the pivot point. 5205 * 5206 * @see #getPivotX() 5207 * @see #getPivotY() 5208 * @return The degrees of rotation. 5209 */ 5210 public float getRotation() { 5211 return mRotation; 5212 } 5213 5214 /** 5215 * Sets the degrees that the view is rotated around the pivot point. Increasing values 5216 * result in clockwise rotation. 5217 * 5218 * @param rotation The degrees of rotation. 5219 * @see #getPivotX() 5220 * @see #getPivotY() 5221 */ 5222 public void setRotation(float rotation) { 5223 if (mRotation != rotation) { 5224 // Double-invalidation is necessary to capture view's old and new areas 5225 invalidate(); 5226 mRotation = rotation; 5227 mMatrixDirty = true; 5228 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5229 invalidate(); 5230 } 5231 } 5232 5233 /** 5234 * The degrees that the view is rotated around the vertical axis through the pivot point. 5235 * 5236 * @see #getPivotX() 5237 * @see #getPivotY() 5238 * @return The degrees of Y rotation. 5239 */ 5240 public float getRotationY() { 5241 return mRotationY; 5242 } 5243 5244 /** 5245 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 5246 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 5247 * down the y axis. 5248 * 5249 * @param rotationY The degrees of Y rotation. 5250 * @see #getPivotX() 5251 * @see #getPivotY() 5252 */ 5253 public void setRotationY(float rotationY) { 5254 if (mRotationY != rotationY) { 5255 // Double-invalidation is necessary to capture view's old and new areas 5256 invalidate(); 5257 mRotationY = rotationY; 5258 mMatrixDirty = true; 5259 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5260 invalidate(); 5261 } 5262 } 5263 5264 /** 5265 * The degrees that the view is rotated around the horizontal axis through the pivot point. 5266 * 5267 * @see #getPivotX() 5268 * @see #getPivotY() 5269 * @return The degrees of X rotation. 5270 */ 5271 public float getRotationX() { 5272 return mRotationX; 5273 } 5274 5275 /** 5276 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 5277 * Increasing values result in clockwise rotation from the viewpoint of looking down the 5278 * x axis. 5279 * 5280 * @param rotationX The degrees of X rotation. 5281 * @see #getPivotX() 5282 * @see #getPivotY() 5283 */ 5284 public void setRotationX(float rotationX) { 5285 if (mRotationX != rotationX) { 5286 // Double-invalidation is necessary to capture view's old and new areas 5287 invalidate(); 5288 mRotationX = rotationX; 5289 mMatrixDirty = true; 5290 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5291 invalidate(); 5292 } 5293 } 5294 5295 /** 5296 * The amount that the view is scaled in x around the pivot point, as a proportion of 5297 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 5298 * 5299 * <p>By default, this is 1.0f. 5300 * 5301 * @see #getPivotX() 5302 * @see #getPivotY() 5303 * @return The scaling factor. 5304 */ 5305 public float getScaleX() { 5306 return mScaleX; 5307 } 5308 5309 /** 5310 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 5311 * the view's unscaled width. A value of 1 means that no scaling is applied. 5312 * 5313 * @param scaleX The scaling factor. 5314 * @see #getPivotX() 5315 * @see #getPivotY() 5316 */ 5317 public void setScaleX(float scaleX) { 5318 if (mScaleX != scaleX) { 5319 // Double-invalidation is necessary to capture view's old and new areas 5320 invalidate(); 5321 mScaleX = scaleX; 5322 mMatrixDirty = true; 5323 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5324 invalidate(); 5325 } 5326 } 5327 5328 /** 5329 * The amount that the view is scaled in y around the pivot point, as a proportion of 5330 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 5331 * 5332 * <p>By default, this is 1.0f. 5333 * 5334 * @see #getPivotX() 5335 * @see #getPivotY() 5336 * @return The scaling factor. 5337 */ 5338 public float getScaleY() { 5339 return mScaleY; 5340 } 5341 5342 /** 5343 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 5344 * the view's unscaled width. A value of 1 means that no scaling is applied. 5345 * 5346 * @param scaleY The scaling factor. 5347 * @see #getPivotX() 5348 * @see #getPivotY() 5349 */ 5350 public void setScaleY(float scaleY) { 5351 if (mScaleY != scaleY) { 5352 // Double-invalidation is necessary to capture view's old and new areas 5353 invalidate(); 5354 mScaleY = scaleY; 5355 mMatrixDirty = true; 5356 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5357 invalidate(); 5358 } 5359 } 5360 5361 /** 5362 * The x location of the point around which the view is {@link #setRotation(float) rotated} 5363 * and {@link #setScaleX(float) scaled}. 5364 * 5365 * @see #getRotation() 5366 * @see #getScaleX() 5367 * @see #getScaleY() 5368 * @see #getPivotY() 5369 * @return The x location of the pivot point. 5370 */ 5371 public float getPivotX() { 5372 return mPivotX; 5373 } 5374 5375 /** 5376 * Sets the x location of the point around which the view is 5377 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 5378 * By default, the pivot point is centered on the object. 5379 * Setting this property disables this behavior and causes the view to use only the 5380 * explicitly set pivotX and pivotY values. 5381 * 5382 * @param pivotX The x location of the pivot point. 5383 * @see #getRotation() 5384 * @see #getScaleX() 5385 * @see #getScaleY() 5386 * @see #getPivotY() 5387 */ 5388 public void setPivotX(float pivotX) { 5389 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5390 if (mPivotX != pivotX) { 5391 // Double-invalidation is necessary to capture view's old and new areas 5392 invalidate(); 5393 mPivotX = pivotX; 5394 mMatrixDirty = true; 5395 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5396 invalidate(); 5397 } 5398 } 5399 5400 /** 5401 * The y location of the point around which the view is {@link #setRotation(float) rotated} 5402 * and {@link #setScaleY(float) scaled}. 5403 * 5404 * @see #getRotation() 5405 * @see #getScaleX() 5406 * @see #getScaleY() 5407 * @see #getPivotY() 5408 * @return The y location of the pivot point. 5409 */ 5410 public float getPivotY() { 5411 return mPivotY; 5412 } 5413 5414 /** 5415 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 5416 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 5417 * Setting this property disables this behavior and causes the view to use only the 5418 * explicitly set pivotX and pivotY values. 5419 * 5420 * @param pivotY The y location of the pivot point. 5421 * @see #getRotation() 5422 * @see #getScaleX() 5423 * @see #getScaleY() 5424 * @see #getPivotY() 5425 */ 5426 public void setPivotY(float pivotY) { 5427 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5428 if (mPivotY != pivotY) { 5429 // Double-invalidation is necessary to capture view's old and new areas 5430 invalidate(); 5431 mPivotY = pivotY; 5432 mMatrixDirty = true; 5433 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5434 invalidate(); 5435 } 5436 } 5437 5438 /** 5439 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 5440 * completely transparent and 1 means the view is completely opaque. 5441 * 5442 * <p>By default this is 1.0f. 5443 * @return The opacity of the view. 5444 */ 5445 public float getAlpha() { 5446 return mAlpha; 5447 } 5448 5449 /** 5450 * Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 5451 * completely transparent and 1 means the view is completely opaque. 5452 * 5453 * @param alpha The opacity of the view. 5454 */ 5455 public void setAlpha(float alpha) { 5456 mAlpha = alpha; 5457 onSetAlpha((int) (alpha * 255)); 5458 invalidate(); 5459 } 5460 5461 /** 5462 * Top position of this view relative to its parent. 5463 * 5464 * @return The top of this view, in pixels. 5465 */ 5466 @ViewDebug.CapturedViewProperty 5467 public final int getTop() { 5468 return mTop; 5469 } 5470 5471 /** 5472 * Sets the top position of this view relative to its parent. This method is meant to be called 5473 * by the layout system and should not generally be called otherwise, because the property 5474 * may be changed at any time by the layout. 5475 * 5476 * @param top The top of this view, in pixels. 5477 */ 5478 public final void setTop(int top) { 5479 if (top != mTop) { 5480 if (hasIdentityMatrix()) { 5481 final ViewParent p = mParent; 5482 if (p != null && mAttachInfo != null) { 5483 final Rect r = mAttachInfo.mTmpInvalRect; 5484 int minTop; 5485 int yLoc; 5486 if (top < mTop) { 5487 minTop = top; 5488 yLoc = top - mTop; 5489 } else { 5490 minTop = mTop; 5491 yLoc = 0; 5492 } 5493 r.set(0, yLoc, mRight - mLeft, mBottom - minTop); 5494 p.invalidateChild(this, r); 5495 } 5496 } else { 5497 // Double-invalidation is necessary to capture view's old and new areas 5498 invalidate(); 5499 } 5500 5501 mTop = top; 5502 5503 if (!mMatrixIsIdentity) { 5504 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5505 invalidate(); 5506 } 5507 } 5508 } 5509 5510 /** 5511 * Bottom position of this view relative to its parent. 5512 * 5513 * @return The bottom of this view, in pixels. 5514 */ 5515 @ViewDebug.CapturedViewProperty 5516 public final int getBottom() { 5517 return mBottom; 5518 } 5519 5520 /** 5521 * Sets the bottom position of this view relative to its parent. This method is meant to be 5522 * called by the layout system and should not generally be called otherwise, because the 5523 * property may be changed at any time by the layout. 5524 * 5525 * @param bottom The bottom of this view, in pixels. 5526 */ 5527 public final void setBottom(int bottom) { 5528 if (bottom != mBottom) { 5529 if (hasIdentityMatrix()) { 5530 final ViewParent p = mParent; 5531 if (p != null && mAttachInfo != null) { 5532 final Rect r = mAttachInfo.mTmpInvalRect; 5533 int maxBottom; 5534 if (bottom < mBottom) { 5535 maxBottom = mBottom; 5536 } else { 5537 maxBottom = bottom; 5538 } 5539 r.set(0, 0, mRight - mLeft, maxBottom - mTop); 5540 p.invalidateChild(this, r); 5541 } 5542 } else { 5543 // Double-invalidation is necessary to capture view's old and new areas 5544 invalidate(); 5545 } 5546 5547 mBottom = bottom; 5548 5549 if (!mMatrixIsIdentity) { 5550 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5551 invalidate(); 5552 } 5553 } 5554 } 5555 5556 /** 5557 * Left position of this view relative to its parent. 5558 * 5559 * @return The left edge of this view, in pixels. 5560 */ 5561 @ViewDebug.CapturedViewProperty 5562 public final int getLeft() { 5563 return mLeft; 5564 } 5565 5566 /** 5567 * Sets the left position of this view relative to its parent. This method is meant to be called 5568 * by the layout system and should not generally be called otherwise, because the property 5569 * may be changed at any time by the layout. 5570 * 5571 * @param left The bottom of this view, in pixels. 5572 */ 5573 public final void setLeft(int left) { 5574 if (left != mLeft) { 5575 System.out.println("view " + this + " left = " + left); 5576 if (hasIdentityMatrix()) { 5577 final ViewParent p = mParent; 5578 if (p != null && mAttachInfo != null) { 5579 final Rect r = mAttachInfo.mTmpInvalRect; 5580 int minLeft; 5581 int xLoc; 5582 if (left < mLeft) { 5583 minLeft = left; 5584 xLoc = left - mLeft; 5585 } else { 5586 minLeft = mLeft; 5587 xLoc = 0; 5588 } 5589 r.set(xLoc, 0, mRight - minLeft, mBottom - mTop); 5590 p.invalidateChild(this, r); 5591 } 5592 } else { 5593 // Double-invalidation is necessary to capture view's old and new areas 5594 invalidate(); 5595 } 5596 5597 mLeft = left; 5598 5599 if (!mMatrixIsIdentity) { 5600 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5601 invalidate(); 5602 } 5603 } 5604 } 5605 5606 /** 5607 * Right position of this view relative to its parent. 5608 * 5609 * @return The right edge of this view, in pixels. 5610 */ 5611 @ViewDebug.CapturedViewProperty 5612 public final int getRight() { 5613 return mRight; 5614 } 5615 5616 /** 5617 * Sets the right position of this view relative to its parent. This method is meant to be called 5618 * by the layout system and should not generally be called otherwise, because the property 5619 * may be changed at any time by the layout. 5620 * 5621 * @param right The bottom of this view, in pixels. 5622 */ 5623 public final void setRight(int right) { 5624 if (right != mRight) { 5625 if (hasIdentityMatrix()) { 5626 final ViewParent p = mParent; 5627 if (p != null && mAttachInfo != null) { 5628 final Rect r = mAttachInfo.mTmpInvalRect; 5629 int maxRight; 5630 if (right < mRight) { 5631 maxRight = mRight; 5632 } else { 5633 maxRight = right; 5634 } 5635 r.set(0, 0, maxRight - mLeft, mBottom - mTop); 5636 p.invalidateChild(this, r); 5637 } 5638 } else { 5639 // Double-invalidation is necessary to capture view's old and new areas 5640 invalidate(); 5641 } 5642 5643 mRight = right; 5644 5645 if (!mMatrixIsIdentity) { 5646 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5647 invalidate(); 5648 } 5649 } 5650 } 5651 5652 /** 5653 * The visual x position of this view, in pixels. This is equivalent to the 5654 * {@link #setTranslationX(float) translationX} property plus the current 5655 * {@link #getLeft() left} property. 5656 * 5657 * @return The visual x position of this view, in pixels. 5658 */ 5659 public float getX() { 5660 return mLeft + mTranslationX; 5661 } 5662 5663 /** 5664 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 5665 * {@link #setTranslationX(float) translationX} property to be the difference between 5666 * the x value passed in and the current {@link #getLeft() left} property. 5667 * 5668 * @param x The visual x position of this view, in pixels. 5669 */ 5670 public void setX(float x) { 5671 setTranslationX(x - mLeft); 5672 } 5673 5674 /** 5675 * The visual y position of this view, in pixels. This is equivalent to the 5676 * {@link #setTranslationY(float) translationY} property plus the current 5677 * {@link #getTop() top} property. 5678 * 5679 * @return The visual y position of this view, in pixels. 5680 */ 5681 public float getY() { 5682 return mTop + mTranslationY; 5683 } 5684 5685 /** 5686 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 5687 * {@link #setTranslationY(float) translationY} property to be the difference between 5688 * the y value passed in and the current {@link #getTop() top} property. 5689 * 5690 * @param y The visual y position of this view, in pixels. 5691 */ 5692 public void setY(float y) { 5693 setTranslationY(y - mTop); 5694 } 5695 5696 5697 /** 5698 * The horizontal location of this view relative to its {@link #getLeft() left} position. 5699 * This position is post-layout, in addition to wherever the object's 5700 * layout placed it. 5701 * 5702 * @return The horizontal position of this view relative to its left position, in pixels. 5703 */ 5704 public float getTranslationX() { 5705 return mTranslationX; 5706 } 5707 5708 /** 5709 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 5710 * This effectively positions the object post-layout, in addition to wherever the object's 5711 * layout placed it. 5712 * 5713 * @param translationX The horizontal position of this view relative to its left position, 5714 * in pixels. 5715 */ 5716 public void setTranslationX(float translationX) { 5717 if (mTranslationX != translationX) { 5718 // Double-invalidation is necessary to capture view's old and new areas 5719 invalidate(); 5720 mTranslationX = translationX; 5721 mMatrixDirty = true; 5722 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5723 invalidate(); 5724 } 5725 } 5726 5727 /** 5728 * The horizontal location of this view relative to its {@link #getTop() top} position. 5729 * This position is post-layout, in addition to wherever the object's 5730 * layout placed it. 5731 * 5732 * @return The vertical position of this view relative to its top position, 5733 * in pixels. 5734 */ 5735 public float getTranslationY() { 5736 return mTranslationY; 5737 } 5738 5739 /** 5740 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 5741 * This effectively positions the object post-layout, in addition to wherever the object's 5742 * layout placed it. 5743 * 5744 * @param translationY The vertical position of this view relative to its top position, 5745 * in pixels. 5746 */ 5747 public void setTranslationY(float translationY) { 5748 if (mTranslationY != translationY) { 5749 // Double-invalidation is necessary to capture view's old and new areas 5750 invalidate(); 5751 mTranslationY = translationY; 5752 mMatrixDirty = true; 5753 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5754 invalidate(); 5755 } 5756 } 5757 5758 /** 5759 * Hit rectangle in parent's coordinates 5760 * 5761 * @param outRect The hit rectangle of the view. 5762 */ 5763 public void getHitRect(Rect outRect) { 5764 if (hasIdentityMatrix() || mAttachInfo == null) { 5765 outRect.set(mLeft, mTop, mRight, mBottom); 5766 } else { 5767 Matrix m = getMatrix(); 5768 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 5769 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 5770 m.mapRect(tmpRect); 5771 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 5772 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 5773 } 5774 } 5775 5776 /** 5777 * Determines whether the given point, in local coordinates is inside the view. 5778 */ 5779 /*package*/ final boolean pointInView(float localX, float localY) { 5780 return localX >= 0 && localX < (mRight - mLeft) 5781 && localY >= 0 && localY < (mBottom - mTop); 5782 } 5783 5784 /** 5785 * Utility method to determine whether the given point, in local coordinates, 5786 * is inside the view, where the area of the view is expanded by the slop factor. 5787 * This method is called while processing touch-move events to determine if the event 5788 * is still within the view. 5789 */ 5790 private boolean pointInView(float localX, float localY, float slop) { 5791 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 5792 localY < ((mBottom - mTop) + slop); 5793 } 5794 5795 /** 5796 * When a view has focus and the user navigates away from it, the next view is searched for 5797 * starting from the rectangle filled in by this method. 5798 * 5799 * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your 5800 * view maintains some idea of internal selection, such as a cursor, or a selected row 5801 * or column, you should override this method and fill in a more specific rectangle. 5802 * 5803 * @param r The rectangle to fill in, in this view's coordinates. 5804 */ 5805 public void getFocusedRect(Rect r) { 5806 getDrawingRect(r); 5807 } 5808 5809 /** 5810 * If some part of this view is not clipped by any of its parents, then 5811 * return that area in r in global (root) coordinates. To convert r to local 5812 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 5813 * -globalOffset.y)) If the view is completely clipped or translated out, 5814 * return false. 5815 * 5816 * @param r If true is returned, r holds the global coordinates of the 5817 * visible portion of this view. 5818 * @param globalOffset If true is returned, globalOffset holds the dx,dy 5819 * between this view and its root. globalOffet may be null. 5820 * @return true if r is non-empty (i.e. part of the view is visible at the 5821 * root level. 5822 */ 5823 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 5824 int width = mRight - mLeft; 5825 int height = mBottom - mTop; 5826 if (width > 0 && height > 0) { 5827 r.set(0, 0, width, height); 5828 if (globalOffset != null) { 5829 globalOffset.set(-mScrollX, -mScrollY); 5830 } 5831 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 5832 } 5833 return false; 5834 } 5835 5836 public final boolean getGlobalVisibleRect(Rect r) { 5837 return getGlobalVisibleRect(r, null); 5838 } 5839 5840 public final boolean getLocalVisibleRect(Rect r) { 5841 Point offset = new Point(); 5842 if (getGlobalVisibleRect(r, offset)) { 5843 r.offset(-offset.x, -offset.y); // make r local 5844 return true; 5845 } 5846 return false; 5847 } 5848 5849 /** 5850 * Offset this view's vertical location by the specified number of pixels. 5851 * 5852 * @param offset the number of pixels to offset the view by 5853 */ 5854 public void offsetTopAndBottom(int offset) { 5855 if (offset != 0) { 5856 if (hasIdentityMatrix()) { 5857 final ViewParent p = mParent; 5858 if (p != null && mAttachInfo != null) { 5859 final Rect r = mAttachInfo.mTmpInvalRect; 5860 int minTop; 5861 int maxBottom; 5862 int yLoc; 5863 if (offset < 0) { 5864 minTop = mTop + offset; 5865 maxBottom = mBottom; 5866 yLoc = offset; 5867 } else { 5868 minTop = mTop; 5869 maxBottom = mBottom + offset; 5870 yLoc = 0; 5871 } 5872 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 5873 p.invalidateChild(this, r); 5874 } 5875 } else { 5876 invalidate(); 5877 } 5878 5879 mTop += offset; 5880 mBottom += offset; 5881 5882 if (!mMatrixIsIdentity) { 5883 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5884 invalidate(); 5885 } 5886 } 5887 } 5888 5889 /** 5890 * Offset this view's horizontal location by the specified amount of pixels. 5891 * 5892 * @param offset the numer of pixels to offset the view by 5893 */ 5894 public void offsetLeftAndRight(int offset) { 5895 if (offset != 0) { 5896 if (hasIdentityMatrix()) { 5897 final ViewParent p = mParent; 5898 if (p != null && mAttachInfo != null) { 5899 final Rect r = mAttachInfo.mTmpInvalRect; 5900 int minLeft; 5901 int maxRight; 5902 if (offset < 0) { 5903 minLeft = mLeft + offset; 5904 maxRight = mRight; 5905 } else { 5906 minLeft = mLeft; 5907 maxRight = mRight + offset; 5908 } 5909 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 5910 p.invalidateChild(this, r); 5911 } 5912 } else { 5913 invalidate(); 5914 } 5915 5916 mLeft += offset; 5917 mRight += offset; 5918 5919 if (!mMatrixIsIdentity) { 5920 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5921 invalidate(); 5922 } 5923 } 5924 } 5925 5926 /** 5927 * Get the LayoutParams associated with this view. All views should have 5928 * layout parameters. These supply parameters to the <i>parent</i> of this 5929 * view specifying how it should be arranged. There are many subclasses of 5930 * ViewGroup.LayoutParams, and these correspond to the different subclasses 5931 * of ViewGroup that are responsible for arranging their children. 5932 * @return The LayoutParams associated with this view 5933 */ 5934 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 5935 public ViewGroup.LayoutParams getLayoutParams() { 5936 return mLayoutParams; 5937 } 5938 5939 /** 5940 * Set the layout parameters associated with this view. These supply 5941 * parameters to the <i>parent</i> of this view specifying how it should be 5942 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 5943 * correspond to the different subclasses of ViewGroup that are responsible 5944 * for arranging their children. 5945 * 5946 * @param params the layout parameters for this view 5947 */ 5948 public void setLayoutParams(ViewGroup.LayoutParams params) { 5949 if (params == null) { 5950 throw new NullPointerException("params == null"); 5951 } 5952 mLayoutParams = params; 5953 requestLayout(); 5954 } 5955 5956 /** 5957 * Set the scrolled position of your view. This will cause a call to 5958 * {@link #onScrollChanged(int, int, int, int)} and the view will be 5959 * invalidated. 5960 * @param x the x position to scroll to 5961 * @param y the y position to scroll to 5962 */ 5963 public void scrollTo(int x, int y) { 5964 if (mScrollX != x || mScrollY != y) { 5965 int oldX = mScrollX; 5966 int oldY = mScrollY; 5967 mScrollX = x; 5968 mScrollY = y; 5969 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 5970 if (!awakenScrollBars()) { 5971 invalidate(); 5972 } 5973 } 5974 } 5975 5976 /** 5977 * Move the scrolled position of your view. This will cause a call to 5978 * {@link #onScrollChanged(int, int, int, int)} and the view will be 5979 * invalidated. 5980 * @param x the amount of pixels to scroll by horizontally 5981 * @param y the amount of pixels to scroll by vertically 5982 */ 5983 public void scrollBy(int x, int y) { 5984 scrollTo(mScrollX + x, mScrollY + y); 5985 } 5986 5987 /** 5988 * <p>Trigger the scrollbars to draw. When invoked this method starts an 5989 * animation to fade the scrollbars out after a default delay. If a subclass 5990 * provides animated scrolling, the start delay should equal the duration 5991 * of the scrolling animation.</p> 5992 * 5993 * <p>The animation starts only if at least one of the scrollbars is 5994 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 5995 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 5996 * this method returns true, and false otherwise. If the animation is 5997 * started, this method calls {@link #invalidate()}; in that case the 5998 * caller should not call {@link #invalidate()}.</p> 5999 * 6000 * <p>This method should be invoked every time a subclass directly updates 6001 * the scroll parameters.</p> 6002 * 6003 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 6004 * and {@link #scrollTo(int, int)}.</p> 6005 * 6006 * @return true if the animation is played, false otherwise 6007 * 6008 * @see #awakenScrollBars(int) 6009 * @see #scrollBy(int, int) 6010 * @see #scrollTo(int, int) 6011 * @see #isHorizontalScrollBarEnabled() 6012 * @see #isVerticalScrollBarEnabled() 6013 * @see #setHorizontalScrollBarEnabled(boolean) 6014 * @see #setVerticalScrollBarEnabled(boolean) 6015 */ 6016 protected boolean awakenScrollBars() { 6017 return mScrollCache != null && 6018 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 6019 } 6020 6021 /** 6022 * Trigger the scrollbars to draw. 6023 * This method differs from awakenScrollBars() only in its default duration. 6024 * initialAwakenScrollBars() will show the scroll bars for longer than 6025 * usual to give the user more of a chance to notice them. 6026 * 6027 * @return true if the animation is played, false otherwise. 6028 */ 6029 private boolean initialAwakenScrollBars() { 6030 return mScrollCache != null && 6031 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 6032 } 6033 6034 /** 6035 * <p> 6036 * Trigger the scrollbars to draw. When invoked this method starts an 6037 * animation to fade the scrollbars out after a fixed delay. If a subclass 6038 * provides animated scrolling, the start delay should equal the duration of 6039 * the scrolling animation. 6040 * </p> 6041 * 6042 * <p> 6043 * The animation starts only if at least one of the scrollbars is enabled, 6044 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6045 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6046 * this method returns true, and false otherwise. If the animation is 6047 * started, this method calls {@link #invalidate()}; in that case the caller 6048 * should not call {@link #invalidate()}. 6049 * </p> 6050 * 6051 * <p> 6052 * This method should be invoked everytime a subclass directly updates the 6053 * scroll parameters. 6054 * </p> 6055 * 6056 * @param startDelay the delay, in milliseconds, after which the animation 6057 * should start; when the delay is 0, the animation starts 6058 * immediately 6059 * @return true if the animation is played, false otherwise 6060 * 6061 * @see #scrollBy(int, int) 6062 * @see #scrollTo(int, int) 6063 * @see #isHorizontalScrollBarEnabled() 6064 * @see #isVerticalScrollBarEnabled() 6065 * @see #setHorizontalScrollBarEnabled(boolean) 6066 * @see #setVerticalScrollBarEnabled(boolean) 6067 */ 6068 protected boolean awakenScrollBars(int startDelay) { 6069 return awakenScrollBars(startDelay, true); 6070 } 6071 6072 /** 6073 * <p> 6074 * Trigger the scrollbars to draw. When invoked this method starts an 6075 * animation to fade the scrollbars out after a fixed delay. If a subclass 6076 * provides animated scrolling, the start delay should equal the duration of 6077 * the scrolling animation. 6078 * </p> 6079 * 6080 * <p> 6081 * The animation starts only if at least one of the scrollbars is enabled, 6082 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6083 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6084 * this method returns true, and false otherwise. If the animation is 6085 * started, this method calls {@link #invalidate()} if the invalidate parameter 6086 * is set to true; in that case the caller 6087 * should not call {@link #invalidate()}. 6088 * </p> 6089 * 6090 * <p> 6091 * This method should be invoked everytime a subclass directly updates the 6092 * scroll parameters. 6093 * </p> 6094 * 6095 * @param startDelay the delay, in milliseconds, after which the animation 6096 * should start; when the delay is 0, the animation starts 6097 * immediately 6098 * 6099 * @param invalidate Wheter this method should call invalidate 6100 * 6101 * @return true if the animation is played, false otherwise 6102 * 6103 * @see #scrollBy(int, int) 6104 * @see #scrollTo(int, int) 6105 * @see #isHorizontalScrollBarEnabled() 6106 * @see #isVerticalScrollBarEnabled() 6107 * @see #setHorizontalScrollBarEnabled(boolean) 6108 * @see #setVerticalScrollBarEnabled(boolean) 6109 */ 6110 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 6111 final ScrollabilityCache scrollCache = mScrollCache; 6112 6113 if (scrollCache == null || !scrollCache.fadeScrollBars) { 6114 return false; 6115 } 6116 6117 if (scrollCache.scrollBar == null) { 6118 scrollCache.scrollBar = new ScrollBarDrawable(); 6119 } 6120 6121 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 6122 6123 if (invalidate) { 6124 // Invalidate to show the scrollbars 6125 invalidate(); 6126 } 6127 6128 if (scrollCache.state == ScrollabilityCache.OFF) { 6129 // FIXME: this is copied from WindowManagerService. 6130 // We should get this value from the system when it 6131 // is possible to do so. 6132 final int KEY_REPEAT_FIRST_DELAY = 750; 6133 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 6134 } 6135 6136 // Tell mScrollCache when we should start fading. This may 6137 // extend the fade start time if one was already scheduled 6138 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 6139 scrollCache.fadeStartTime = fadeStartTime; 6140 scrollCache.state = ScrollabilityCache.ON; 6141 6142 // Schedule our fader to run, unscheduling any old ones first 6143 if (mAttachInfo != null) { 6144 mAttachInfo.mHandler.removeCallbacks(scrollCache); 6145 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 6146 } 6147 6148 return true; 6149 } 6150 6151 return false; 6152 } 6153 6154 /** 6155 * Mark the the area defined by dirty as needing to be drawn. If the view is 6156 * visible, {@link #onDraw} will be called at some point in the future. 6157 * This must be called from a UI thread. To call from a non-UI thread, call 6158 * {@link #postInvalidate()}. 6159 * 6160 * WARNING: This method is destructive to dirty. 6161 * @param dirty the rectangle representing the bounds of the dirty region 6162 */ 6163 public void invalidate(Rect dirty) { 6164 if (ViewDebug.TRACE_HIERARCHY) { 6165 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6166 } 6167 6168 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS)) { 6169 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6170 final ViewParent p = mParent; 6171 final AttachInfo ai = mAttachInfo; 6172 if (p != null && ai != null) { 6173 final int scrollX = mScrollX; 6174 final int scrollY = mScrollY; 6175 final Rect r = ai.mTmpInvalRect; 6176 r.set(dirty.left - scrollX, dirty.top - scrollY, 6177 dirty.right - scrollX, dirty.bottom - scrollY); 6178 mParent.invalidateChild(this, r); 6179 } 6180 } 6181 } 6182 6183 /** 6184 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 6185 * The coordinates of the dirty rect are relative to the view. 6186 * If the view is visible, {@link #onDraw} will be called at some point 6187 * in the future. This must be called from a UI thread. To call 6188 * from a non-UI thread, call {@link #postInvalidate()}. 6189 * @param l the left position of the dirty region 6190 * @param t the top position of the dirty region 6191 * @param r the right position of the dirty region 6192 * @param b the bottom position of the dirty region 6193 */ 6194 public void invalidate(int l, int t, int r, int b) { 6195 if (ViewDebug.TRACE_HIERARCHY) { 6196 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6197 } 6198 6199 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS)) { 6200 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6201 final ViewParent p = mParent; 6202 final AttachInfo ai = mAttachInfo; 6203 if (p != null && ai != null && l < r && t < b) { 6204 final int scrollX = mScrollX; 6205 final int scrollY = mScrollY; 6206 final Rect tmpr = ai.mTmpInvalRect; 6207 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 6208 p.invalidateChild(this, tmpr); 6209 } 6210 } 6211 } 6212 6213 /** 6214 * Invalidate the whole view. If the view is visible, {@link #onDraw} will 6215 * be called at some point in the future. This must be called from a 6216 * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 6217 */ 6218 public void invalidate() { 6219 if (ViewDebug.TRACE_HIERARCHY) { 6220 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6221 } 6222 6223 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS)) { 6224 mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; 6225 final ViewParent p = mParent; 6226 final AttachInfo ai = mAttachInfo; 6227 if (p != null && ai != null) { 6228 final Rect r = ai.mTmpInvalRect; 6229 r.set(0, 0, mRight - mLeft, mBottom - mTop); 6230 // Don't call invalidate -- we don't want to internally scroll 6231 // our own bounds 6232 p.invalidateChild(this, r); 6233 } 6234 } 6235 } 6236 6237 /** 6238 * Indicates whether this View is opaque. An opaque View guarantees that it will 6239 * draw all the pixels overlapping its bounds using a fully opaque color. 6240 * 6241 * Subclasses of View should override this method whenever possible to indicate 6242 * whether an instance is opaque. Opaque Views are treated in a special way by 6243 * the View hierarchy, possibly allowing it to perform optimizations during 6244 * invalidate/draw passes. 6245 * 6246 * @return True if this View is guaranteed to be fully opaque, false otherwise. 6247 */ 6248 @ViewDebug.ExportedProperty(category = "drawing") 6249 public boolean isOpaque() { 6250 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK; 6251 } 6252 6253 private void computeOpaqueFlags() { 6254 // Opaque if: 6255 // - Has a background 6256 // - Background is opaque 6257 // - Doesn't have scrollbars or scrollbars are inside overlay 6258 6259 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 6260 mPrivateFlags |= OPAQUE_BACKGROUND; 6261 } else { 6262 mPrivateFlags &= ~OPAQUE_BACKGROUND; 6263 } 6264 6265 final int flags = mViewFlags; 6266 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 6267 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 6268 mPrivateFlags |= OPAQUE_SCROLLBARS; 6269 } else { 6270 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 6271 } 6272 } 6273 6274 /** 6275 * @hide 6276 */ 6277 protected boolean hasOpaqueScrollbars() { 6278 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 6279 } 6280 6281 /** 6282 * @return A handler associated with the thread running the View. This 6283 * handler can be used to pump events in the UI events queue. 6284 */ 6285 public Handler getHandler() { 6286 if (mAttachInfo != null) { 6287 return mAttachInfo.mHandler; 6288 } 6289 return null; 6290 } 6291 6292 /** 6293 * Causes the Runnable to be added to the message queue. 6294 * The runnable will be run on the user interface thread. 6295 * 6296 * @param action The Runnable that will be executed. 6297 * 6298 * @return Returns true if the Runnable was successfully placed in to the 6299 * message queue. Returns false on failure, usually because the 6300 * looper processing the message queue is exiting. 6301 */ 6302 public boolean post(Runnable action) { 6303 Handler handler; 6304 if (mAttachInfo != null) { 6305 handler = mAttachInfo.mHandler; 6306 } else { 6307 // Assume that post will succeed later 6308 ViewRoot.getRunQueue().post(action); 6309 return true; 6310 } 6311 6312 return handler.post(action); 6313 } 6314 6315 /** 6316 * Causes the Runnable to be added to the message queue, to be run 6317 * after the specified amount of time elapses. 6318 * The runnable will be run on the user interface thread. 6319 * 6320 * @param action The Runnable that will be executed. 6321 * @param delayMillis The delay (in milliseconds) until the Runnable 6322 * will be executed. 6323 * 6324 * @return true if the Runnable was successfully placed in to the 6325 * message queue. Returns false on failure, usually because the 6326 * looper processing the message queue is exiting. Note that a 6327 * result of true does not mean the Runnable will be processed -- 6328 * if the looper is quit before the delivery time of the message 6329 * occurs then the message will be dropped. 6330 */ 6331 public boolean postDelayed(Runnable action, long delayMillis) { 6332 Handler handler; 6333 if (mAttachInfo != null) { 6334 handler = mAttachInfo.mHandler; 6335 } else { 6336 // Assume that post will succeed later 6337 ViewRoot.getRunQueue().postDelayed(action, delayMillis); 6338 return true; 6339 } 6340 6341 return handler.postDelayed(action, delayMillis); 6342 } 6343 6344 /** 6345 * Removes the specified Runnable from the message queue. 6346 * 6347 * @param action The Runnable to remove from the message handling queue 6348 * 6349 * @return true if this view could ask the Handler to remove the Runnable, 6350 * false otherwise. When the returned value is true, the Runnable 6351 * may or may not have been actually removed from the message queue 6352 * (for instance, if the Runnable was not in the queue already.) 6353 */ 6354 public boolean removeCallbacks(Runnable action) { 6355 Handler handler; 6356 if (mAttachInfo != null) { 6357 handler = mAttachInfo.mHandler; 6358 } else { 6359 // Assume that post will succeed later 6360 ViewRoot.getRunQueue().removeCallbacks(action); 6361 return true; 6362 } 6363 6364 handler.removeCallbacks(action); 6365 return true; 6366 } 6367 6368 /** 6369 * Cause an invalidate to happen on a subsequent cycle through the event loop. 6370 * Use this to invalidate the View from a non-UI thread. 6371 * 6372 * @see #invalidate() 6373 */ 6374 public void postInvalidate() { 6375 postInvalidateDelayed(0); 6376 } 6377 6378 /** 6379 * Cause an invalidate of the specified area to happen on a subsequent cycle 6380 * through the event loop. Use this to invalidate the View from a non-UI thread. 6381 * 6382 * @param left The left coordinate of the rectangle to invalidate. 6383 * @param top The top coordinate of the rectangle to invalidate. 6384 * @param right The right coordinate of the rectangle to invalidate. 6385 * @param bottom The bottom coordinate of the rectangle to invalidate. 6386 * 6387 * @see #invalidate(int, int, int, int) 6388 * @see #invalidate(Rect) 6389 */ 6390 public void postInvalidate(int left, int top, int right, int bottom) { 6391 postInvalidateDelayed(0, left, top, right, bottom); 6392 } 6393 6394 /** 6395 * Cause an invalidate to happen on a subsequent cycle through the event 6396 * loop. Waits for the specified amount of time. 6397 * 6398 * @param delayMilliseconds the duration in milliseconds to delay the 6399 * invalidation by 6400 */ 6401 public void postInvalidateDelayed(long delayMilliseconds) { 6402 // We try only with the AttachInfo because there's no point in invalidating 6403 // if we are not attached to our window 6404 if (mAttachInfo != null) { 6405 Message msg = Message.obtain(); 6406 msg.what = AttachInfo.INVALIDATE_MSG; 6407 msg.obj = this; 6408 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6409 } 6410 } 6411 6412 /** 6413 * Cause an invalidate of the specified area to happen on a subsequent cycle 6414 * through the event loop. Waits for the specified amount of time. 6415 * 6416 * @param delayMilliseconds the duration in milliseconds to delay the 6417 * invalidation by 6418 * @param left The left coordinate of the rectangle to invalidate. 6419 * @param top The top coordinate of the rectangle to invalidate. 6420 * @param right The right coordinate of the rectangle to invalidate. 6421 * @param bottom The bottom coordinate of the rectangle to invalidate. 6422 */ 6423 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 6424 int right, int bottom) { 6425 6426 // We try only with the AttachInfo because there's no point in invalidating 6427 // if we are not attached to our window 6428 if (mAttachInfo != null) { 6429 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 6430 info.target = this; 6431 info.left = left; 6432 info.top = top; 6433 info.right = right; 6434 info.bottom = bottom; 6435 6436 final Message msg = Message.obtain(); 6437 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 6438 msg.obj = info; 6439 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6440 } 6441 } 6442 6443 /** 6444 * Called by a parent to request that a child update its values for mScrollX 6445 * and mScrollY if necessary. This will typically be done if the child is 6446 * animating a scroll using a {@link android.widget.Scroller Scroller} 6447 * object. 6448 */ 6449 public void computeScroll() { 6450 } 6451 6452 /** 6453 * <p>Indicate whether the horizontal edges are faded when the view is 6454 * scrolled horizontally.</p> 6455 * 6456 * @return true if the horizontal edges should are faded on scroll, false 6457 * otherwise 6458 * 6459 * @see #setHorizontalFadingEdgeEnabled(boolean) 6460 * @attr ref android.R.styleable#View_fadingEdge 6461 */ 6462 public boolean isHorizontalFadingEdgeEnabled() { 6463 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 6464 } 6465 6466 /** 6467 * <p>Define whether the horizontal edges should be faded when this view 6468 * is scrolled horizontally.</p> 6469 * 6470 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 6471 * be faded when the view is scrolled 6472 * horizontally 6473 * 6474 * @see #isHorizontalFadingEdgeEnabled() 6475 * @attr ref android.R.styleable#View_fadingEdge 6476 */ 6477 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 6478 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 6479 if (horizontalFadingEdgeEnabled) { 6480 initScrollCache(); 6481 } 6482 6483 mViewFlags ^= FADING_EDGE_HORIZONTAL; 6484 } 6485 } 6486 6487 /** 6488 * <p>Indicate whether the vertical edges are faded when the view is 6489 * scrolled horizontally.</p> 6490 * 6491 * @return true if the vertical edges should are faded on scroll, false 6492 * otherwise 6493 * 6494 * @see #setVerticalFadingEdgeEnabled(boolean) 6495 * @attr ref android.R.styleable#View_fadingEdge 6496 */ 6497 public boolean isVerticalFadingEdgeEnabled() { 6498 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 6499 } 6500 6501 /** 6502 * <p>Define whether the vertical edges should be faded when this view 6503 * is scrolled vertically.</p> 6504 * 6505 * @param verticalFadingEdgeEnabled true if the vertical edges should 6506 * be faded when the view is scrolled 6507 * vertically 6508 * 6509 * @see #isVerticalFadingEdgeEnabled() 6510 * @attr ref android.R.styleable#View_fadingEdge 6511 */ 6512 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 6513 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 6514 if (verticalFadingEdgeEnabled) { 6515 initScrollCache(); 6516 } 6517 6518 mViewFlags ^= FADING_EDGE_VERTICAL; 6519 } 6520 } 6521 6522 /** 6523 * Returns the strength, or intensity, of the top faded edge. The strength is 6524 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 6525 * returns 0.0 or 1.0 but no value in between. 6526 * 6527 * Subclasses should override this method to provide a smoother fade transition 6528 * when scrolling occurs. 6529 * 6530 * @return the intensity of the top fade as a float between 0.0f and 1.0f 6531 */ 6532 protected float getTopFadingEdgeStrength() { 6533 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 6534 } 6535 6536 /** 6537 * Returns the strength, or intensity, of the bottom faded edge. The strength is 6538 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 6539 * returns 0.0 or 1.0 but no value in between. 6540 * 6541 * Subclasses should override this method to provide a smoother fade transition 6542 * when scrolling occurs. 6543 * 6544 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 6545 */ 6546 protected float getBottomFadingEdgeStrength() { 6547 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 6548 computeVerticalScrollRange() ? 1.0f : 0.0f; 6549 } 6550 6551 /** 6552 * Returns the strength, or intensity, of the left faded edge. The strength is 6553 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 6554 * returns 0.0 or 1.0 but no value in between. 6555 * 6556 * Subclasses should override this method to provide a smoother fade transition 6557 * when scrolling occurs. 6558 * 6559 * @return the intensity of the left fade as a float between 0.0f and 1.0f 6560 */ 6561 protected float getLeftFadingEdgeStrength() { 6562 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 6563 } 6564 6565 /** 6566 * Returns the strength, or intensity, of the right faded edge. The strength is 6567 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 6568 * returns 0.0 or 1.0 but no value in between. 6569 * 6570 * Subclasses should override this method to provide a smoother fade transition 6571 * when scrolling occurs. 6572 * 6573 * @return the intensity of the right fade as a float between 0.0f and 1.0f 6574 */ 6575 protected float getRightFadingEdgeStrength() { 6576 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 6577 computeHorizontalScrollRange() ? 1.0f : 0.0f; 6578 } 6579 6580 /** 6581 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 6582 * scrollbar is not drawn by default.</p> 6583 * 6584 * @return true if the horizontal scrollbar should be painted, false 6585 * otherwise 6586 * 6587 * @see #setHorizontalScrollBarEnabled(boolean) 6588 */ 6589 public boolean isHorizontalScrollBarEnabled() { 6590 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 6591 } 6592 6593 /** 6594 * <p>Define whether the horizontal scrollbar should be drawn or not. The 6595 * scrollbar is not drawn by default.</p> 6596 * 6597 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 6598 * be painted 6599 * 6600 * @see #isHorizontalScrollBarEnabled() 6601 */ 6602 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 6603 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 6604 mViewFlags ^= SCROLLBARS_HORIZONTAL; 6605 computeOpaqueFlags(); 6606 recomputePadding(); 6607 } 6608 } 6609 6610 /** 6611 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 6612 * scrollbar is not drawn by default.</p> 6613 * 6614 * @return true if the vertical scrollbar should be painted, false 6615 * otherwise 6616 * 6617 * @see #setVerticalScrollBarEnabled(boolean) 6618 */ 6619 public boolean isVerticalScrollBarEnabled() { 6620 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 6621 } 6622 6623 /** 6624 * <p>Define whether the vertical scrollbar should be drawn or not. The 6625 * scrollbar is not drawn by default.</p> 6626 * 6627 * @param verticalScrollBarEnabled true if the vertical scrollbar should 6628 * be painted 6629 * 6630 * @see #isVerticalScrollBarEnabled() 6631 */ 6632 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 6633 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 6634 mViewFlags ^= SCROLLBARS_VERTICAL; 6635 computeOpaqueFlags(); 6636 recomputePadding(); 6637 } 6638 } 6639 6640 private void recomputePadding() { 6641 setPadding(mPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 6642 } 6643 6644 /** 6645 * Define whether scrollbars will fade when the view is not scrolling. 6646 * 6647 * @param fadeScrollbars wheter to enable fading 6648 * 6649 */ 6650 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 6651 initScrollCache(); 6652 final ScrollabilityCache scrollabilityCache = mScrollCache; 6653 scrollabilityCache.fadeScrollBars = fadeScrollbars; 6654 if (fadeScrollbars) { 6655 scrollabilityCache.state = ScrollabilityCache.OFF; 6656 } else { 6657 scrollabilityCache.state = ScrollabilityCache.ON; 6658 } 6659 } 6660 6661 /** 6662 * 6663 * Returns true if scrollbars will fade when this view is not scrolling 6664 * 6665 * @return true if scrollbar fading is enabled 6666 */ 6667 public boolean isScrollbarFadingEnabled() { 6668 return mScrollCache != null && mScrollCache.fadeScrollBars; 6669 } 6670 6671 /** 6672 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 6673 * inset. When inset, they add to the padding of the view. And the scrollbars 6674 * can be drawn inside the padding area or on the edge of the view. For example, 6675 * if a view has a background drawable and you want to draw the scrollbars 6676 * inside the padding specified by the drawable, you can use 6677 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 6678 * appear at the edge of the view, ignoring the padding, then you can use 6679 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 6680 * @param style the style of the scrollbars. Should be one of 6681 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 6682 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 6683 * @see #SCROLLBARS_INSIDE_OVERLAY 6684 * @see #SCROLLBARS_INSIDE_INSET 6685 * @see #SCROLLBARS_OUTSIDE_OVERLAY 6686 * @see #SCROLLBARS_OUTSIDE_INSET 6687 */ 6688 public void setScrollBarStyle(int style) { 6689 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 6690 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 6691 computeOpaqueFlags(); 6692 recomputePadding(); 6693 } 6694 } 6695 6696 /** 6697 * <p>Returns the current scrollbar style.</p> 6698 * @return the current scrollbar style 6699 * @see #SCROLLBARS_INSIDE_OVERLAY 6700 * @see #SCROLLBARS_INSIDE_INSET 6701 * @see #SCROLLBARS_OUTSIDE_OVERLAY 6702 * @see #SCROLLBARS_OUTSIDE_INSET 6703 */ 6704 public int getScrollBarStyle() { 6705 return mViewFlags & SCROLLBARS_STYLE_MASK; 6706 } 6707 6708 /** 6709 * <p>Compute the horizontal range that the horizontal scrollbar 6710 * represents.</p> 6711 * 6712 * <p>The range is expressed in arbitrary units that must be the same as the 6713 * units used by {@link #computeHorizontalScrollExtent()} and 6714 * {@link #computeHorizontalScrollOffset()}.</p> 6715 * 6716 * <p>The default range is the drawing width of this view.</p> 6717 * 6718 * @return the total horizontal range represented by the horizontal 6719 * scrollbar 6720 * 6721 * @see #computeHorizontalScrollExtent() 6722 * @see #computeHorizontalScrollOffset() 6723 * @see android.widget.ScrollBarDrawable 6724 */ 6725 protected int computeHorizontalScrollRange() { 6726 return getWidth(); 6727 } 6728 6729 /** 6730 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 6731 * within the horizontal range. This value is used to compute the position 6732 * of the thumb within the scrollbar's track.</p> 6733 * 6734 * <p>The range is expressed in arbitrary units that must be the same as the 6735 * units used by {@link #computeHorizontalScrollRange()} and 6736 * {@link #computeHorizontalScrollExtent()}.</p> 6737 * 6738 * <p>The default offset is the scroll offset of this view.</p> 6739 * 6740 * @return the horizontal offset of the scrollbar's thumb 6741 * 6742 * @see #computeHorizontalScrollRange() 6743 * @see #computeHorizontalScrollExtent() 6744 * @see android.widget.ScrollBarDrawable 6745 */ 6746 protected int computeHorizontalScrollOffset() { 6747 return mScrollX; 6748 } 6749 6750 /** 6751 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 6752 * within the horizontal range. This value is used to compute the length 6753 * of the thumb within the scrollbar's track.</p> 6754 * 6755 * <p>The range is expressed in arbitrary units that must be the same as the 6756 * units used by {@link #computeHorizontalScrollRange()} and 6757 * {@link #computeHorizontalScrollOffset()}.</p> 6758 * 6759 * <p>The default extent is the drawing width of this view.</p> 6760 * 6761 * @return the horizontal extent of the scrollbar's thumb 6762 * 6763 * @see #computeHorizontalScrollRange() 6764 * @see #computeHorizontalScrollOffset() 6765 * @see android.widget.ScrollBarDrawable 6766 */ 6767 protected int computeHorizontalScrollExtent() { 6768 return getWidth(); 6769 } 6770 6771 /** 6772 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 6773 * 6774 * <p>The range is expressed in arbitrary units that must be the same as the 6775 * units used by {@link #computeVerticalScrollExtent()} and 6776 * {@link #computeVerticalScrollOffset()}.</p> 6777 * 6778 * @return the total vertical range represented by the vertical scrollbar 6779 * 6780 * <p>The default range is the drawing height of this view.</p> 6781 * 6782 * @see #computeVerticalScrollExtent() 6783 * @see #computeVerticalScrollOffset() 6784 * @see android.widget.ScrollBarDrawable 6785 */ 6786 protected int computeVerticalScrollRange() { 6787 return getHeight(); 6788 } 6789 6790 /** 6791 * <p>Compute the vertical offset of the vertical scrollbar's thumb 6792 * within the horizontal range. This value is used to compute the position 6793 * of the thumb within the scrollbar's track.</p> 6794 * 6795 * <p>The range is expressed in arbitrary units that must be the same as the 6796 * units used by {@link #computeVerticalScrollRange()} and 6797 * {@link #computeVerticalScrollExtent()}.</p> 6798 * 6799 * <p>The default offset is the scroll offset of this view.</p> 6800 * 6801 * @return the vertical offset of the scrollbar's thumb 6802 * 6803 * @see #computeVerticalScrollRange() 6804 * @see #computeVerticalScrollExtent() 6805 * @see android.widget.ScrollBarDrawable 6806 */ 6807 protected int computeVerticalScrollOffset() { 6808 return mScrollY; 6809 } 6810 6811 /** 6812 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 6813 * within the vertical range. This value is used to compute the length 6814 * of the thumb within the scrollbar's track.</p> 6815 * 6816 * <p>The range is expressed in arbitrary units that must be the same as the 6817 * units used by {@link #computeVerticalScrollRange()} and 6818 * {@link #computeVerticalScrollOffset()}.</p> 6819 * 6820 * <p>The default extent is the drawing height of this view.</p> 6821 * 6822 * @return the vertical extent of the scrollbar's thumb 6823 * 6824 * @see #computeVerticalScrollRange() 6825 * @see #computeVerticalScrollOffset() 6826 * @see android.widget.ScrollBarDrawable 6827 */ 6828 protected int computeVerticalScrollExtent() { 6829 return getHeight(); 6830 } 6831 6832 /** 6833 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 6834 * scrollbars are painted only if they have been awakened first.</p> 6835 * 6836 * @param canvas the canvas on which to draw the scrollbars 6837 * 6838 * @see #awakenScrollBars(int) 6839 */ 6840 protected final void onDrawScrollBars(Canvas canvas) { 6841 // scrollbars are drawn only when the animation is running 6842 final ScrollabilityCache cache = mScrollCache; 6843 if (cache != null) { 6844 6845 int state = cache.state; 6846 6847 if (state == ScrollabilityCache.OFF) { 6848 return; 6849 } 6850 6851 boolean invalidate = false; 6852 6853 if (state == ScrollabilityCache.FADING) { 6854 // We're fading -- get our fade interpolation 6855 if (cache.interpolatorValues == null) { 6856 cache.interpolatorValues = new float[1]; 6857 } 6858 6859 float[] values = cache.interpolatorValues; 6860 6861 // Stops the animation if we're done 6862 if (cache.scrollBarInterpolator.timeToValues(values) == 6863 Interpolator.Result.FREEZE_END) { 6864 cache.state = ScrollabilityCache.OFF; 6865 } else { 6866 cache.scrollBar.setAlpha(Math.round(values[0])); 6867 } 6868 6869 // This will make the scroll bars inval themselves after 6870 // drawing. We only want this when we're fading so that 6871 // we prevent excessive redraws 6872 invalidate = true; 6873 } else { 6874 // We're just on -- but we may have been fading before so 6875 // reset alpha 6876 cache.scrollBar.setAlpha(255); 6877 } 6878 6879 6880 final int viewFlags = mViewFlags; 6881 6882 final boolean drawHorizontalScrollBar = 6883 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 6884 final boolean drawVerticalScrollBar = 6885 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 6886 && !isVerticalScrollBarHidden(); 6887 6888 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 6889 final int width = mRight - mLeft; 6890 final int height = mBottom - mTop; 6891 6892 final ScrollBarDrawable scrollBar = cache.scrollBar; 6893 int size = scrollBar.getSize(false); 6894 if (size <= 0) { 6895 size = cache.scrollBarSize; 6896 } 6897 6898 final int scrollX = mScrollX; 6899 final int scrollY = mScrollY; 6900 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 6901 6902 int left, top, right, bottom; 6903 6904 if (drawHorizontalScrollBar) { 6905 scrollBar.setParameters(computeHorizontalScrollRange(), 6906 computeHorizontalScrollOffset(), 6907 computeHorizontalScrollExtent(), false); 6908 final int verticalScrollBarGap = drawVerticalScrollBar ? 6909 getVerticalScrollbarWidth() : 0; 6910 top = scrollY + height - size - (mUserPaddingBottom & inside); 6911 left = scrollX + (mPaddingLeft & inside); 6912 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 6913 bottom = top + size; 6914 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 6915 if (invalidate) { 6916 invalidate(left, top, right, bottom); 6917 } 6918 } 6919 6920 if (drawVerticalScrollBar) { 6921 scrollBar.setParameters(computeVerticalScrollRange(), 6922 computeVerticalScrollOffset(), 6923 computeVerticalScrollExtent(), true); 6924 // TODO: Deal with RTL languages to position scrollbar on left 6925 left = scrollX + width - size - (mUserPaddingRight & inside); 6926 top = scrollY + (mPaddingTop & inside); 6927 right = left + size; 6928 bottom = scrollY + height - (mUserPaddingBottom & inside); 6929 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 6930 if (invalidate) { 6931 invalidate(left, top, right, bottom); 6932 } 6933 } 6934 } 6935 } 6936 } 6937 6938 /** 6939 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 6940 * FastScroller is visible. 6941 * @return whether to temporarily hide the vertical scrollbar 6942 * @hide 6943 */ 6944 protected boolean isVerticalScrollBarHidden() { 6945 return false; 6946 } 6947 6948 /** 6949 * <p>Draw the horizontal scrollbar if 6950 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 6951 * 6952 * @param canvas the canvas on which to draw the scrollbar 6953 * @param scrollBar the scrollbar's drawable 6954 * 6955 * @see #isHorizontalScrollBarEnabled() 6956 * @see #computeHorizontalScrollRange() 6957 * @see #computeHorizontalScrollExtent() 6958 * @see #computeHorizontalScrollOffset() 6959 * @see android.widget.ScrollBarDrawable 6960 * @hide 6961 */ 6962 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 6963 int l, int t, int r, int b) { 6964 scrollBar.setBounds(l, t, r, b); 6965 scrollBar.draw(canvas); 6966 } 6967 6968 /** 6969 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 6970 * returns true.</p> 6971 * 6972 * @param canvas the canvas on which to draw the scrollbar 6973 * @param scrollBar the scrollbar's drawable 6974 * 6975 * @see #isVerticalScrollBarEnabled() 6976 * @see #computeVerticalScrollRange() 6977 * @see #computeVerticalScrollExtent() 6978 * @see #computeVerticalScrollOffset() 6979 * @see android.widget.ScrollBarDrawable 6980 * @hide 6981 */ 6982 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 6983 int l, int t, int r, int b) { 6984 scrollBar.setBounds(l, t, r, b); 6985 scrollBar.draw(canvas); 6986 } 6987 6988 /** 6989 * Implement this to do your drawing. 6990 * 6991 * @param canvas the canvas on which the background will be drawn 6992 */ 6993 protected void onDraw(Canvas canvas) { 6994 } 6995 6996 /* 6997 * Caller is responsible for calling requestLayout if necessary. 6998 * (This allows addViewInLayout to not request a new layout.) 6999 */ 7000 void assignParent(ViewParent parent) { 7001 if (mParent == null) { 7002 mParent = parent; 7003 } else if (parent == null) { 7004 mParent = null; 7005 } else { 7006 throw new RuntimeException("view " + this + " being added, but" 7007 + " it already has a parent"); 7008 } 7009 } 7010 7011 /** 7012 * This is called when the view is attached to a window. At this point it 7013 * has a Surface and will start drawing. Note that this function is 7014 * guaranteed to be called before {@link #onDraw}, however it may be called 7015 * any time before the first onDraw -- including before or after 7016 * {@link #onMeasure}. 7017 * 7018 * @see #onDetachedFromWindow() 7019 */ 7020 protected void onAttachedToWindow() { 7021 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 7022 mParent.requestTransparentRegion(this); 7023 } 7024 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 7025 initialAwakenScrollBars(); 7026 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 7027 } 7028 } 7029 7030 /** 7031 * This is called when the view is detached from a window. At this point it 7032 * no longer has a surface for drawing. 7033 * 7034 * @see #onAttachedToWindow() 7035 */ 7036 protected void onDetachedFromWindow() { 7037 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 7038 removeUnsetPressCallback(); 7039 removeLongPressCallback(); 7040 destroyDrawingCache(); 7041 } 7042 7043 /** 7044 * @return The number of times this view has been attached to a window 7045 */ 7046 protected int getWindowAttachCount() { 7047 return mWindowAttachCount; 7048 } 7049 7050 /** 7051 * Retrieve a unique token identifying the window this view is attached to. 7052 * @return Return the window's token for use in 7053 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 7054 */ 7055 public IBinder getWindowToken() { 7056 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 7057 } 7058 7059 /** 7060 * Retrieve a unique token identifying the top-level "real" window of 7061 * the window that this view is attached to. That is, this is like 7062 * {@link #getWindowToken}, except if the window this view in is a panel 7063 * window (attached to another containing window), then the token of 7064 * the containing window is returned instead. 7065 * 7066 * @return Returns the associated window token, either 7067 * {@link #getWindowToken()} or the containing window's token. 7068 */ 7069 public IBinder getApplicationWindowToken() { 7070 AttachInfo ai = mAttachInfo; 7071 if (ai != null) { 7072 IBinder appWindowToken = ai.mPanelParentWindowToken; 7073 if (appWindowToken == null) { 7074 appWindowToken = ai.mWindowToken; 7075 } 7076 return appWindowToken; 7077 } 7078 return null; 7079 } 7080 7081 /** 7082 * Retrieve private session object this view hierarchy is using to 7083 * communicate with the window manager. 7084 * @return the session object to communicate with the window manager 7085 */ 7086 /*package*/ IWindowSession getWindowSession() { 7087 return mAttachInfo != null ? mAttachInfo.mSession : null; 7088 } 7089 7090 /** 7091 * @param info the {@link android.view.View.AttachInfo} to associated with 7092 * this view 7093 */ 7094 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 7095 //System.out.println("Attached! " + this); 7096 mAttachInfo = info; 7097 mWindowAttachCount++; 7098 if (mFloatingTreeObserver != null) { 7099 info.mTreeObserver.merge(mFloatingTreeObserver); 7100 mFloatingTreeObserver = null; 7101 } 7102 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 7103 mAttachInfo.mScrollContainers.add(this); 7104 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 7105 } 7106 performCollectViewAttributes(visibility); 7107 onAttachedToWindow(); 7108 int vis = info.mWindowVisibility; 7109 if (vis != GONE) { 7110 onWindowVisibilityChanged(vis); 7111 } 7112 } 7113 7114 void dispatchDetachedFromWindow() { 7115 //System.out.println("Detached! " + this); 7116 AttachInfo info = mAttachInfo; 7117 if (info != null) { 7118 int vis = info.mWindowVisibility; 7119 if (vis != GONE) { 7120 onWindowVisibilityChanged(GONE); 7121 } 7122 } 7123 7124 onDetachedFromWindow(); 7125 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 7126 mAttachInfo.mScrollContainers.remove(this); 7127 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 7128 } 7129 mAttachInfo = null; 7130 } 7131 7132 /** 7133 * Store this view hierarchy's frozen state into the given container. 7134 * 7135 * @param container The SparseArray in which to save the view's state. 7136 * 7137 * @see #restoreHierarchyState 7138 * @see #dispatchSaveInstanceState 7139 * @see #onSaveInstanceState 7140 */ 7141 public void saveHierarchyState(SparseArray<Parcelable> container) { 7142 dispatchSaveInstanceState(container); 7143 } 7144 7145 /** 7146 * Called by {@link #saveHierarchyState} to store the state for this view and its children. 7147 * May be overridden to modify how freezing happens to a view's children; for example, some 7148 * views may want to not store state for their children. 7149 * 7150 * @param container The SparseArray in which to save the view's state. 7151 * 7152 * @see #dispatchRestoreInstanceState 7153 * @see #saveHierarchyState 7154 * @see #onSaveInstanceState 7155 */ 7156 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 7157 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 7158 mPrivateFlags &= ~SAVE_STATE_CALLED; 7159 Parcelable state = onSaveInstanceState(); 7160 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7161 throw new IllegalStateException( 7162 "Derived class did not call super.onSaveInstanceState()"); 7163 } 7164 if (state != null) { 7165 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 7166 // + ": " + state); 7167 container.put(mID, state); 7168 } 7169 } 7170 } 7171 7172 /** 7173 * Hook allowing a view to generate a representation of its internal state 7174 * that can later be used to create a new instance with that same state. 7175 * This state should only contain information that is not persistent or can 7176 * not be reconstructed later. For example, you will never store your 7177 * current position on screen because that will be computed again when a 7178 * new instance of the view is placed in its view hierarchy. 7179 * <p> 7180 * Some examples of things you may store here: the current cursor position 7181 * in a text view (but usually not the text itself since that is stored in a 7182 * content provider or other persistent storage), the currently selected 7183 * item in a list view. 7184 * 7185 * @return Returns a Parcelable object containing the view's current dynamic 7186 * state, or null if there is nothing interesting to save. The 7187 * default implementation returns null. 7188 * @see #onRestoreInstanceState 7189 * @see #saveHierarchyState 7190 * @see #dispatchSaveInstanceState 7191 * @see #setSaveEnabled(boolean) 7192 */ 7193 protected Parcelable onSaveInstanceState() { 7194 mPrivateFlags |= SAVE_STATE_CALLED; 7195 return BaseSavedState.EMPTY_STATE; 7196 } 7197 7198 /** 7199 * Restore this view hierarchy's frozen state from the given container. 7200 * 7201 * @param container The SparseArray which holds previously frozen states. 7202 * 7203 * @see #saveHierarchyState 7204 * @see #dispatchRestoreInstanceState 7205 * @see #onRestoreInstanceState 7206 */ 7207 public void restoreHierarchyState(SparseArray<Parcelable> container) { 7208 dispatchRestoreInstanceState(container); 7209 } 7210 7211 /** 7212 * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its 7213 * children. May be overridden to modify how restoreing happens to a view's children; for 7214 * example, some views may want to not store state for their children. 7215 * 7216 * @param container The SparseArray which holds previously saved state. 7217 * 7218 * @see #dispatchSaveInstanceState 7219 * @see #restoreHierarchyState 7220 * @see #onRestoreInstanceState 7221 */ 7222 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 7223 if (mID != NO_ID) { 7224 Parcelable state = container.get(mID); 7225 if (state != null) { 7226 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 7227 // + ": " + state); 7228 mPrivateFlags &= ~SAVE_STATE_CALLED; 7229 onRestoreInstanceState(state); 7230 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7231 throw new IllegalStateException( 7232 "Derived class did not call super.onRestoreInstanceState()"); 7233 } 7234 } 7235 } 7236 } 7237 7238 /** 7239 * Hook allowing a view to re-apply a representation of its internal state that had previously 7240 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 7241 * null state. 7242 * 7243 * @param state The frozen state that had previously been returned by 7244 * {@link #onSaveInstanceState}. 7245 * 7246 * @see #onSaveInstanceState 7247 * @see #restoreHierarchyState 7248 * @see #dispatchRestoreInstanceState 7249 */ 7250 protected void onRestoreInstanceState(Parcelable state) { 7251 mPrivateFlags |= SAVE_STATE_CALLED; 7252 if (state != BaseSavedState.EMPTY_STATE && state != null) { 7253 throw new IllegalArgumentException("Wrong state class, expecting View State but " 7254 + "received " + state.getClass().toString() + " instead. This usually happens " 7255 + "when two views of different type have the same id in the same hierarchy. " 7256 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 7257 + "other views do not use the same id."); 7258 } 7259 } 7260 7261 /** 7262 * <p>Return the time at which the drawing of the view hierarchy started.</p> 7263 * 7264 * @return the drawing start time in milliseconds 7265 */ 7266 public long getDrawingTime() { 7267 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 7268 } 7269 7270 /** 7271 * <p>Enables or disables the duplication of the parent's state into this view. When 7272 * duplication is enabled, this view gets its drawable state from its parent rather 7273 * than from its own internal properties.</p> 7274 * 7275 * <p>Note: in the current implementation, setting this property to true after the 7276 * view was added to a ViewGroup might have no effect at all. This property should 7277 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 7278 * 7279 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 7280 * property is enabled, an exception will be thrown.</p> 7281 * 7282 * @param enabled True to enable duplication of the parent's drawable state, false 7283 * to disable it. 7284 * 7285 * @see #getDrawableState() 7286 * @see #isDuplicateParentStateEnabled() 7287 */ 7288 public void setDuplicateParentStateEnabled(boolean enabled) { 7289 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 7290 } 7291 7292 /** 7293 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 7294 * 7295 * @return True if this view's drawable state is duplicated from the parent, 7296 * false otherwise 7297 * 7298 * @see #getDrawableState() 7299 * @see #setDuplicateParentStateEnabled(boolean) 7300 */ 7301 public boolean isDuplicateParentStateEnabled() { 7302 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 7303 } 7304 7305 /** 7306 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 7307 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 7308 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 7309 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 7310 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 7311 * null.</p> 7312 * 7313 * @param enabled true to enable the drawing cache, false otherwise 7314 * 7315 * @see #isDrawingCacheEnabled() 7316 * @see #getDrawingCache() 7317 * @see #buildDrawingCache() 7318 */ 7319 public void setDrawingCacheEnabled(boolean enabled) { 7320 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 7321 } 7322 7323 /** 7324 * <p>Indicates whether the drawing cache is enabled for this view.</p> 7325 * 7326 * @return true if the drawing cache is enabled 7327 * 7328 * @see #setDrawingCacheEnabled(boolean) 7329 * @see #getDrawingCache() 7330 */ 7331 @ViewDebug.ExportedProperty(category = "drawing") 7332 public boolean isDrawingCacheEnabled() { 7333 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 7334 } 7335 7336 /** 7337 * <p>Returns a display list that can be used to draw this view again 7338 * without executing its draw method.</p> 7339 * 7340 * @return A DisplayList ready to replay, or null if caching is not enabled. 7341 */ 7342 DisplayList getDisplayList() { 7343 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 7344 return null; 7345 } 7346 7347 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 7348 return null; 7349 } 7350 7351 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED && 7352 ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mDisplayList == null)) { 7353 7354 if (mDisplayList != null) { 7355 mDisplayList.destroy(); 7356 } 7357 7358 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 7359 7360 final HardwareCanvas canvas = mDisplayList.start(); 7361 try { 7362 int width = mRight - mLeft; 7363 int height = mBottom - mTop; 7364 7365 canvas.setViewport(width, height); 7366 canvas.onPreDraw(); 7367 7368 final int restoreCount = canvas.save(); 7369 7370 mPrivateFlags |= DRAWN; 7371 mPrivateFlags |= DRAWING_CACHE_VALID; 7372 7373 // Fast path for layouts with no backgrounds 7374 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 7375 mPrivateFlags &= ~DIRTY_MASK; 7376 dispatchDraw(canvas); 7377 } else { 7378 draw(canvas); 7379 } 7380 7381 canvas.restoreToCount(restoreCount); 7382 } finally { 7383 canvas.onPostDraw(); 7384 7385 mDisplayList.end(); 7386 7387 canvas.destroy(); 7388 } 7389 } 7390 7391 return mDisplayList; 7392 } 7393 7394 /** 7395 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 7396 * 7397 * @return A non-scaled bitmap representing this view or null if cache is disabled. 7398 * 7399 * @see #getDrawingCache(boolean) 7400 */ 7401 public Bitmap getDrawingCache() { 7402 return getDrawingCache(false); 7403 } 7404 7405 /** 7406 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 7407 * is null when caching is disabled. If caching is enabled and the cache is not ready, 7408 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 7409 * draw from the cache when the cache is enabled. To benefit from the cache, you must 7410 * request the drawing cache by calling this method and draw it on screen if the 7411 * returned bitmap is not null.</p> 7412 * 7413 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 7414 * this method will create a bitmap of the same size as this view. Because this bitmap 7415 * will be drawn scaled by the parent ViewGroup, the result on screen might show 7416 * scaling artifacts. To avoid such artifacts, you should call this method by setting 7417 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 7418 * size than the view. This implies that your application must be able to handle this 7419 * size.</p> 7420 * 7421 * @param autoScale Indicates whether the generated bitmap should be scaled based on 7422 * the current density of the screen when the application is in compatibility 7423 * mode. 7424 * 7425 * @return A bitmap representing this view or null if cache is disabled. 7426 * 7427 * @see #setDrawingCacheEnabled(boolean) 7428 * @see #isDrawingCacheEnabled() 7429 * @see #buildDrawingCache(boolean) 7430 * @see #destroyDrawingCache() 7431 */ 7432 public Bitmap getDrawingCache(boolean autoScale) { 7433 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 7434 return null; 7435 } 7436 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 7437 buildDrawingCache(autoScale); 7438 } 7439 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 7440 } 7441 7442 /** 7443 * <p>Frees the resources used by the drawing cache. If you call 7444 * {@link #buildDrawingCache()} manually without calling 7445 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 7446 * should cleanup the cache with this method afterwards.</p> 7447 * 7448 * @see #setDrawingCacheEnabled(boolean) 7449 * @see #buildDrawingCache() 7450 * @see #getDrawingCache() 7451 */ 7452 public void destroyDrawingCache() { 7453 if (mDrawingCache != null) { 7454 mDrawingCache.recycle(); 7455 mDrawingCache = null; 7456 } 7457 if (mUnscaledDrawingCache != null) { 7458 mUnscaledDrawingCache.recycle(); 7459 mUnscaledDrawingCache = null; 7460 } 7461 if (mDisplayList != null) { 7462 mDisplayList.destroy(); 7463 mDisplayList = null; 7464 } 7465 } 7466 7467 /** 7468 * Setting a solid background color for the drawing cache's bitmaps will improve 7469 * perfromance and memory usage. Note, though that this should only be used if this 7470 * view will always be drawn on top of a solid color. 7471 * 7472 * @param color The background color to use for the drawing cache's bitmap 7473 * 7474 * @see #setDrawingCacheEnabled(boolean) 7475 * @see #buildDrawingCache() 7476 * @see #getDrawingCache() 7477 */ 7478 public void setDrawingCacheBackgroundColor(int color) { 7479 if (color != mDrawingCacheBackgroundColor) { 7480 mDrawingCacheBackgroundColor = color; 7481 mPrivateFlags &= ~DRAWING_CACHE_VALID; 7482 } 7483 } 7484 7485 /** 7486 * @see #setDrawingCacheBackgroundColor(int) 7487 * 7488 * @return The background color to used for the drawing cache's bitmap 7489 */ 7490 public int getDrawingCacheBackgroundColor() { 7491 return mDrawingCacheBackgroundColor; 7492 } 7493 7494 /** 7495 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 7496 * 7497 * @see #buildDrawingCache(boolean) 7498 */ 7499 public void buildDrawingCache() { 7500 buildDrawingCache(false); 7501 } 7502 7503 /** 7504 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 7505 * 7506 * <p>If you call {@link #buildDrawingCache()} manually without calling 7507 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 7508 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 7509 * 7510 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 7511 * this method will create a bitmap of the same size as this view. Because this bitmap 7512 * will be drawn scaled by the parent ViewGroup, the result on screen might show 7513 * scaling artifacts. To avoid such artifacts, you should call this method by setting 7514 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 7515 * size than the view. This implies that your application must be able to handle this 7516 * size.</p> 7517 * 7518 * @see #getDrawingCache() 7519 * @see #destroyDrawingCache() 7520 */ 7521 public void buildDrawingCache(boolean autoScale) { 7522 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 7523 mDrawingCache == null : mUnscaledDrawingCache == null)) { 7524 7525 if (ViewDebug.TRACE_HIERARCHY) { 7526 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 7527 } 7528 7529 int width = mRight - mLeft; 7530 int height = mBottom - mTop; 7531 7532 final AttachInfo attachInfo = mAttachInfo; 7533 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 7534 7535 if (autoScale && scalingRequired) { 7536 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 7537 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 7538 } 7539 7540 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 7541 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 7542 final boolean translucentWindow = attachInfo != null && attachInfo.mTranslucentWindow; 7543 7544 if (width <= 0 || height <= 0 || 7545 // Projected bitmap size in bytes 7546 (width * height * (opaque && !translucentWindow ? 2 : 4) > 7547 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 7548 destroyDrawingCache(); 7549 return; 7550 } 7551 7552 boolean clear = true; 7553 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 7554 7555 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 7556 Bitmap.Config quality; 7557 if (!opaque) { 7558 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 7559 case DRAWING_CACHE_QUALITY_AUTO: 7560 quality = Bitmap.Config.ARGB_8888; 7561 break; 7562 case DRAWING_CACHE_QUALITY_LOW: 7563 quality = Bitmap.Config.ARGB_4444; 7564 break; 7565 case DRAWING_CACHE_QUALITY_HIGH: 7566 quality = Bitmap.Config.ARGB_8888; 7567 break; 7568 default: 7569 quality = Bitmap.Config.ARGB_8888; 7570 break; 7571 } 7572 } else { 7573 // Optimization for translucent windows 7574 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 7575 quality = translucentWindow ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 7576 } 7577 7578 // Try to cleanup memory 7579 if (bitmap != null) bitmap.recycle(); 7580 7581 try { 7582 bitmap = Bitmap.createBitmap(width, height, quality); 7583 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 7584 if (autoScale) { 7585 mDrawingCache = bitmap; 7586 } else { 7587 mUnscaledDrawingCache = bitmap; 7588 } 7589 if (opaque && translucentWindow) bitmap.setHasAlpha(false); 7590 } catch (OutOfMemoryError e) { 7591 // If there is not enough memory to create the bitmap cache, just 7592 // ignore the issue as bitmap caches are not required to draw the 7593 // view hierarchy 7594 if (autoScale) { 7595 mDrawingCache = null; 7596 } else { 7597 mUnscaledDrawingCache = null; 7598 } 7599 return; 7600 } 7601 7602 clear = drawingCacheBackgroundColor != 0; 7603 } 7604 7605 Canvas canvas; 7606 if (attachInfo != null) { 7607 canvas = attachInfo.mCanvas; 7608 if (canvas == null) { 7609 canvas = new Canvas(); 7610 } 7611 canvas.setBitmap(bitmap); 7612 // Temporarily clobber the cached Canvas in case one of our children 7613 // is also using a drawing cache. Without this, the children would 7614 // steal the canvas by attaching their own bitmap to it and bad, bad 7615 // thing would happen (invisible views, corrupted drawings, etc.) 7616 attachInfo.mCanvas = null; 7617 } else { 7618 // This case should hopefully never or seldom happen 7619 canvas = new Canvas(bitmap); 7620 } 7621 7622 if (clear) { 7623 bitmap.eraseColor(drawingCacheBackgroundColor); 7624 } 7625 7626 computeScroll(); 7627 final int restoreCount = canvas.save(); 7628 7629 if (autoScale && scalingRequired) { 7630 final float scale = attachInfo.mApplicationScale; 7631 canvas.scale(scale, scale); 7632 } 7633 7634 canvas.translate(-mScrollX, -mScrollY); 7635 7636 mPrivateFlags |= DRAWN; 7637 mPrivateFlags |= DRAWING_CACHE_VALID; 7638 7639 // Fast path for layouts with no backgrounds 7640 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 7641 if (ViewDebug.TRACE_HIERARCHY) { 7642 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 7643 } 7644 mPrivateFlags &= ~DIRTY_MASK; 7645 dispatchDraw(canvas); 7646 } else { 7647 draw(canvas); 7648 } 7649 7650 canvas.restoreToCount(restoreCount); 7651 7652 if (attachInfo != null) { 7653 // Restore the cached Canvas for our siblings 7654 attachInfo.mCanvas = canvas; 7655 } 7656 } 7657 } 7658 7659 /** 7660 * Create a snapshot of the view into a bitmap. We should probably make 7661 * some form of this public, but should think about the API. 7662 */ 7663 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 7664 int width = mRight - mLeft; 7665 int height = mBottom - mTop; 7666 7667 final AttachInfo attachInfo = mAttachInfo; 7668 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 7669 width = (int) ((width * scale) + 0.5f); 7670 height = (int) ((height * scale) + 0.5f); 7671 7672 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 7673 if (bitmap == null) { 7674 throw new OutOfMemoryError(); 7675 } 7676 7677 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 7678 7679 Canvas canvas; 7680 if (attachInfo != null) { 7681 canvas = attachInfo.mCanvas; 7682 if (canvas == null) { 7683 canvas = new Canvas(); 7684 } 7685 canvas.setBitmap(bitmap); 7686 // Temporarily clobber the cached Canvas in case one of our children 7687 // is also using a drawing cache. Without this, the children would 7688 // steal the canvas by attaching their own bitmap to it and bad, bad 7689 // things would happen (invisible views, corrupted drawings, etc.) 7690 attachInfo.mCanvas = null; 7691 } else { 7692 // This case should hopefully never or seldom happen 7693 canvas = new Canvas(bitmap); 7694 } 7695 7696 if ((backgroundColor & 0xff000000) != 0) { 7697 bitmap.eraseColor(backgroundColor); 7698 } 7699 7700 computeScroll(); 7701 final int restoreCount = canvas.save(); 7702 canvas.scale(scale, scale); 7703 canvas.translate(-mScrollX, -mScrollY); 7704 7705 // Temporarily remove the dirty mask 7706 int flags = mPrivateFlags; 7707 mPrivateFlags &= ~DIRTY_MASK; 7708 7709 // Fast path for layouts with no backgrounds 7710 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 7711 dispatchDraw(canvas); 7712 } else { 7713 draw(canvas); 7714 } 7715 7716 mPrivateFlags = flags; 7717 7718 canvas.restoreToCount(restoreCount); 7719 7720 if (attachInfo != null) { 7721 // Restore the cached Canvas for our siblings 7722 attachInfo.mCanvas = canvas; 7723 } 7724 7725 return bitmap; 7726 } 7727 7728 /** 7729 * Indicates whether this View is currently in edit mode. A View is usually 7730 * in edit mode when displayed within a developer tool. For instance, if 7731 * this View is being drawn by a visual user interface builder, this method 7732 * should return true. 7733 * 7734 * Subclasses should check the return value of this method to provide 7735 * different behaviors if their normal behavior might interfere with the 7736 * host environment. For instance: the class spawns a thread in its 7737 * constructor, the drawing code relies on device-specific features, etc. 7738 * 7739 * This method is usually checked in the drawing code of custom widgets. 7740 * 7741 * @return True if this View is in edit mode, false otherwise. 7742 */ 7743 public boolean isInEditMode() { 7744 return false; 7745 } 7746 7747 /** 7748 * If the View draws content inside its padding and enables fading edges, 7749 * it needs to support padding offsets. Padding offsets are added to the 7750 * fading edges to extend the length of the fade so that it covers pixels 7751 * drawn inside the padding. 7752 * 7753 * Subclasses of this class should override this method if they need 7754 * to draw content inside the padding. 7755 * 7756 * @return True if padding offset must be applied, false otherwise. 7757 * 7758 * @see #getLeftPaddingOffset() 7759 * @see #getRightPaddingOffset() 7760 * @see #getTopPaddingOffset() 7761 * @see #getBottomPaddingOffset() 7762 * 7763 * @since CURRENT 7764 */ 7765 protected boolean isPaddingOffsetRequired() { 7766 return false; 7767 } 7768 7769 /** 7770 * Amount by which to extend the left fading region. Called only when 7771 * {@link #isPaddingOffsetRequired()} returns true. 7772 * 7773 * @return The left padding offset in pixels. 7774 * 7775 * @see #isPaddingOffsetRequired() 7776 * 7777 * @since CURRENT 7778 */ 7779 protected int getLeftPaddingOffset() { 7780 return 0; 7781 } 7782 7783 /** 7784 * Amount by which to extend the right fading region. Called only when 7785 * {@link #isPaddingOffsetRequired()} returns true. 7786 * 7787 * @return The right padding offset in pixels. 7788 * 7789 * @see #isPaddingOffsetRequired() 7790 * 7791 * @since CURRENT 7792 */ 7793 protected int getRightPaddingOffset() { 7794 return 0; 7795 } 7796 7797 /** 7798 * Amount by which to extend the top fading region. Called only when 7799 * {@link #isPaddingOffsetRequired()} returns true. 7800 * 7801 * @return The top padding offset in pixels. 7802 * 7803 * @see #isPaddingOffsetRequired() 7804 * 7805 * @since CURRENT 7806 */ 7807 protected int getTopPaddingOffset() { 7808 return 0; 7809 } 7810 7811 /** 7812 * Amount by which to extend the bottom fading region. Called only when 7813 * {@link #isPaddingOffsetRequired()} returns true. 7814 * 7815 * @return The bottom padding offset in pixels. 7816 * 7817 * @see #isPaddingOffsetRequired() 7818 * 7819 * @since CURRENT 7820 */ 7821 protected int getBottomPaddingOffset() { 7822 return 0; 7823 } 7824 7825 /** 7826 * <p>Indicates whether this view is attached to an hardware accelerated 7827 * window or not.</p> 7828 * 7829 * <p>Even if this method returns true, it does not mean that every call 7830 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 7831 * accelerated {@link android.graphics.Canvas}. For instance, if this view 7832 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 7833 * window is hardware accelerated, 7834 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 7835 * return false, and this method will return true.</p> 7836 * 7837 * @return True if the view is attached to a window and the window is 7838 * hardware accelerated; false in any other case. 7839 */ 7840 public boolean isHardwareAccelerated() { 7841 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 7842 } 7843 7844 /** 7845 * Manually render this view (and all of its children) to the given Canvas. 7846 * The view must have already done a full layout before this function is 7847 * called. When implementing a view, do not override this method; instead, 7848 * you should implement {@link #onDraw}. 7849 * 7850 * @param canvas The Canvas to which the View is rendered. 7851 */ 7852 public void draw(Canvas canvas) { 7853 if (ViewDebug.TRACE_HIERARCHY) { 7854 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 7855 } 7856 7857 final int privateFlags = mPrivateFlags; 7858 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 7859 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 7860 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 7861 7862 /* 7863 * Draw traversal performs several drawing steps which must be executed 7864 * in the appropriate order: 7865 * 7866 * 1. Draw the background 7867 * 2. If necessary, save the canvas' layers to prepare for fading 7868 * 3. Draw view's content 7869 * 4. Draw children 7870 * 5. If necessary, draw the fading edges and restore layers 7871 * 6. Draw decorations (scrollbars for instance) 7872 */ 7873 7874 // Step 1, draw the background, if needed 7875 int saveCount; 7876 7877 if (!dirtyOpaque) { 7878 final Drawable background = mBGDrawable; 7879 if (background != null) { 7880 final int scrollX = mScrollX; 7881 final int scrollY = mScrollY; 7882 7883 if (mBackgroundSizeChanged) { 7884 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 7885 mBackgroundSizeChanged = false; 7886 } 7887 7888 if ((scrollX | scrollY) == 0) { 7889 background.draw(canvas); 7890 } else { 7891 canvas.translate(scrollX, scrollY); 7892 background.draw(canvas); 7893 canvas.translate(-scrollX, -scrollY); 7894 } 7895 } 7896 } 7897 7898 // skip step 2 & 5 if possible (common case) 7899 final int viewFlags = mViewFlags; 7900 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 7901 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 7902 if (!verticalEdges && !horizontalEdges) { 7903 // Step 3, draw the content 7904 if (!dirtyOpaque) onDraw(canvas); 7905 7906 // Step 4, draw the children 7907 dispatchDraw(canvas); 7908 7909 // Step 6, draw decorations (scrollbars) 7910 onDrawScrollBars(canvas); 7911 7912 // we're done... 7913 return; 7914 } 7915 7916 /* 7917 * Here we do the full fledged routine... 7918 * (this is an uncommon case where speed matters less, 7919 * this is why we repeat some of the tests that have been 7920 * done above) 7921 */ 7922 7923 boolean drawTop = false; 7924 boolean drawBottom = false; 7925 boolean drawLeft = false; 7926 boolean drawRight = false; 7927 7928 float topFadeStrength = 0.0f; 7929 float bottomFadeStrength = 0.0f; 7930 float leftFadeStrength = 0.0f; 7931 float rightFadeStrength = 0.0f; 7932 7933 // Step 2, save the canvas' layers 7934 int paddingLeft = mPaddingLeft; 7935 int paddingTop = mPaddingTop; 7936 7937 final boolean offsetRequired = isPaddingOffsetRequired(); 7938 if (offsetRequired) { 7939 paddingLeft += getLeftPaddingOffset(); 7940 paddingTop += getTopPaddingOffset(); 7941 } 7942 7943 int left = mScrollX + paddingLeft; 7944 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 7945 int top = mScrollY + paddingTop; 7946 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 7947 7948 if (offsetRequired) { 7949 right += getRightPaddingOffset(); 7950 bottom += getBottomPaddingOffset(); 7951 } 7952 7953 final ScrollabilityCache scrollabilityCache = mScrollCache; 7954 int length = scrollabilityCache.fadingEdgeLength; 7955 7956 // clip the fade length if top and bottom fades overlap 7957 // overlapping fades produce odd-looking artifacts 7958 if (verticalEdges && (top + length > bottom - length)) { 7959 length = (bottom - top) / 2; 7960 } 7961 7962 // also clip horizontal fades if necessary 7963 if (horizontalEdges && (left + length > right - length)) { 7964 length = (right - left) / 2; 7965 } 7966 7967 if (verticalEdges) { 7968 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 7969 drawTop = topFadeStrength > 0.0f; 7970 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 7971 drawBottom = bottomFadeStrength > 0.0f; 7972 } 7973 7974 if (horizontalEdges) { 7975 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 7976 drawLeft = leftFadeStrength > 0.0f; 7977 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 7978 drawRight = rightFadeStrength > 0.0f; 7979 } 7980 7981 saveCount = canvas.getSaveCount(); 7982 7983 int solidColor = getSolidColor(); 7984 if (solidColor == 0) { 7985 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 7986 7987 if (drawTop) { 7988 canvas.saveLayer(left, top, right, top + length, null, flags); 7989 } 7990 7991 if (drawBottom) { 7992 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 7993 } 7994 7995 if (drawLeft) { 7996 canvas.saveLayer(left, top, left + length, bottom, null, flags); 7997 } 7998 7999 if (drawRight) { 8000 canvas.saveLayer(right - length, top, right, bottom, null, flags); 8001 } 8002 } else { 8003 scrollabilityCache.setFadeColor(solidColor); 8004 } 8005 8006 // Step 3, draw the content 8007 if (!dirtyOpaque) onDraw(canvas); 8008 8009 // Step 4, draw the children 8010 dispatchDraw(canvas); 8011 8012 // Step 5, draw the fade effect and restore layers 8013 final Paint p = scrollabilityCache.paint; 8014 final Matrix matrix = scrollabilityCache.matrix; 8015 final Shader fade = scrollabilityCache.shader; 8016 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 8017 8018 if (drawTop) { 8019 matrix.setScale(1, fadeHeight * topFadeStrength); 8020 matrix.postTranslate(left, top); 8021 fade.setLocalMatrix(matrix); 8022 canvas.drawRect(left, top, right, top + length, p); 8023 } 8024 8025 if (drawBottom) { 8026 matrix.setScale(1, fadeHeight * bottomFadeStrength); 8027 matrix.postRotate(180); 8028 matrix.postTranslate(left, bottom); 8029 fade.setLocalMatrix(matrix); 8030 canvas.drawRect(left, bottom - length, right, bottom, p); 8031 } 8032 8033 if (drawLeft) { 8034 matrix.setScale(1, fadeHeight * leftFadeStrength); 8035 matrix.postRotate(-90); 8036 matrix.postTranslate(left, top); 8037 fade.setLocalMatrix(matrix); 8038 canvas.drawRect(left, top, left + length, bottom, p); 8039 } 8040 8041 if (drawRight) { 8042 matrix.setScale(1, fadeHeight * rightFadeStrength); 8043 matrix.postRotate(90); 8044 matrix.postTranslate(right, top); 8045 fade.setLocalMatrix(matrix); 8046 canvas.drawRect(right - length, top, right, bottom, p); 8047 } 8048 8049 canvas.restoreToCount(saveCount); 8050 8051 // Step 6, draw decorations (scrollbars) 8052 onDrawScrollBars(canvas); 8053 } 8054 8055 /** 8056 * Override this if your view is known to always be drawn on top of a solid color background, 8057 * and needs to draw fading edges. Returning a non-zero color enables the view system to 8058 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 8059 * should be set to 0xFF. 8060 * 8061 * @see #setVerticalFadingEdgeEnabled 8062 * @see #setHorizontalFadingEdgeEnabled 8063 * 8064 * @return The known solid color background for this view, or 0 if the color may vary 8065 */ 8066 public int getSolidColor() { 8067 return 0; 8068 } 8069 8070 /** 8071 * Build a human readable string representation of the specified view flags. 8072 * 8073 * @param flags the view flags to convert to a string 8074 * @return a String representing the supplied flags 8075 */ 8076 private static String printFlags(int flags) { 8077 String output = ""; 8078 int numFlags = 0; 8079 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 8080 output += "TAKES_FOCUS"; 8081 numFlags++; 8082 } 8083 8084 switch (flags & VISIBILITY_MASK) { 8085 case INVISIBLE: 8086 if (numFlags > 0) { 8087 output += " "; 8088 } 8089 output += "INVISIBLE"; 8090 // USELESS HERE numFlags++; 8091 break; 8092 case GONE: 8093 if (numFlags > 0) { 8094 output += " "; 8095 } 8096 output += "GONE"; 8097 // USELESS HERE numFlags++; 8098 break; 8099 default: 8100 break; 8101 } 8102 return output; 8103 } 8104 8105 /** 8106 * Build a human readable string representation of the specified private 8107 * view flags. 8108 * 8109 * @param privateFlags the private view flags to convert to a string 8110 * @return a String representing the supplied flags 8111 */ 8112 private static String printPrivateFlags(int privateFlags) { 8113 String output = ""; 8114 int numFlags = 0; 8115 8116 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 8117 output += "WANTS_FOCUS"; 8118 numFlags++; 8119 } 8120 8121 if ((privateFlags & FOCUSED) == FOCUSED) { 8122 if (numFlags > 0) { 8123 output += " "; 8124 } 8125 output += "FOCUSED"; 8126 numFlags++; 8127 } 8128 8129 if ((privateFlags & SELECTED) == SELECTED) { 8130 if (numFlags > 0) { 8131 output += " "; 8132 } 8133 output += "SELECTED"; 8134 numFlags++; 8135 } 8136 8137 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 8138 if (numFlags > 0) { 8139 output += " "; 8140 } 8141 output += "IS_ROOT_NAMESPACE"; 8142 numFlags++; 8143 } 8144 8145 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 8146 if (numFlags > 0) { 8147 output += " "; 8148 } 8149 output += "HAS_BOUNDS"; 8150 numFlags++; 8151 } 8152 8153 if ((privateFlags & DRAWN) == DRAWN) { 8154 if (numFlags > 0) { 8155 output += " "; 8156 } 8157 output += "DRAWN"; 8158 // USELESS HERE numFlags++; 8159 } 8160 return output; 8161 } 8162 8163 /** 8164 * <p>Indicates whether or not this view's layout will be requested during 8165 * the next hierarchy layout pass.</p> 8166 * 8167 * @return true if the layout will be forced during next layout pass 8168 */ 8169 public boolean isLayoutRequested() { 8170 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 8171 } 8172 8173 /** 8174 * Assign a size and position to a view and all of its 8175 * descendants 8176 * 8177 * <p>This is the second phase of the layout mechanism. 8178 * (The first is measuring). In this phase, each parent calls 8179 * layout on all of its children to position them. 8180 * This is typically done using the child measurements 8181 * that were stored in the measure pass(). 8182 * 8183 * Derived classes with children should override 8184 * onLayout. In that method, they should 8185 * call layout on each of their children. 8186 * 8187 * @param l Left position, relative to parent 8188 * @param t Top position, relative to parent 8189 * @param r Right position, relative to parent 8190 * @param b Bottom position, relative to parent 8191 */ 8192 @SuppressWarnings({"unchecked"}) 8193 public final void layout(int l, int t, int r, int b) { 8194 int oldL = mLeft; 8195 int oldT = mTop; 8196 int oldB = mBottom; 8197 int oldR = mRight; 8198 boolean changed = setFrame(l, t, r, b); 8199 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 8200 if (ViewDebug.TRACE_HIERARCHY) { 8201 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 8202 } 8203 8204 onLayout(changed, l, t, r, b); 8205 mPrivateFlags &= ~LAYOUT_REQUIRED; 8206 8207 if (mOnLayoutChangeListeners != null) { 8208 ArrayList<OnLayoutChangeListener> listenersCopy = 8209 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 8210 int numListeners = listenersCopy.size(); 8211 for (int i = 0; i < numListeners; ++i) { 8212 listenersCopy.get(i).onLayoutChange(this, l, r, t, b, oldL, oldT, oldR, oldB); 8213 } 8214 } 8215 } 8216 mPrivateFlags &= ~FORCE_LAYOUT; 8217 } 8218 8219 /** 8220 * Called from layout when this view should 8221 * assign a size and position to each of its children. 8222 * 8223 * Derived classes with children should override 8224 * this method and call layout on each of 8225 * their children. 8226 * @param changed This is a new size or position for this view 8227 * @param left Left position, relative to parent 8228 * @param top Top position, relative to parent 8229 * @param right Right position, relative to parent 8230 * @param bottom Bottom position, relative to parent 8231 */ 8232 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 8233 } 8234 8235 /** 8236 * Assign a size and position to this view. 8237 * 8238 * This is called from layout. 8239 * 8240 * @param left Left position, relative to parent 8241 * @param top Top position, relative to parent 8242 * @param right Right position, relative to parent 8243 * @param bottom Bottom position, relative to parent 8244 * @return true if the new size and position are different than the 8245 * previous ones 8246 * {@hide} 8247 */ 8248 protected boolean setFrame(int left, int top, int right, int bottom) { 8249 boolean changed = false; 8250 8251 if (DBG) { 8252 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 8253 + right + "," + bottom + ")"); 8254 } 8255 8256 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 8257 changed = true; 8258 8259 // Remember our drawn bit 8260 int drawn = mPrivateFlags & DRAWN; 8261 8262 // Invalidate our old position 8263 invalidate(); 8264 8265 8266 int oldWidth = mRight - mLeft; 8267 int oldHeight = mBottom - mTop; 8268 8269 mLeft = left; 8270 mTop = top; 8271 mRight = right; 8272 mBottom = bottom; 8273 8274 mPrivateFlags |= HAS_BOUNDS; 8275 8276 int newWidth = right - left; 8277 int newHeight = bottom - top; 8278 8279 if (newWidth != oldWidth || newHeight != oldHeight) { 8280 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 8281 } 8282 8283 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 8284 // If we are visible, force the DRAWN bit to on so that 8285 // this invalidate will go through (at least to our parent). 8286 // This is because someone may have invalidated this view 8287 // before this call to setFrame came in, therby clearing 8288 // the DRAWN bit. 8289 mPrivateFlags |= DRAWN; 8290 invalidate(); 8291 } 8292 8293 // Reset drawn bit to original value (invalidate turns it off) 8294 mPrivateFlags |= drawn; 8295 8296 mBackgroundSizeChanged = true; 8297 } 8298 return changed; 8299 } 8300 8301 /** 8302 * Finalize inflating a view from XML. This is called as the last phase 8303 * of inflation, after all child views have been added. 8304 * 8305 * <p>Even if the subclass overrides onFinishInflate, they should always be 8306 * sure to call the super method, so that we get called. 8307 */ 8308 protected void onFinishInflate() { 8309 } 8310 8311 /** 8312 * Returns the resources associated with this view. 8313 * 8314 * @return Resources object. 8315 */ 8316 public Resources getResources() { 8317 return mResources; 8318 } 8319 8320 /** 8321 * Invalidates the specified Drawable. 8322 * 8323 * @param drawable the drawable to invalidate 8324 */ 8325 public void invalidateDrawable(Drawable drawable) { 8326 if (verifyDrawable(drawable)) { 8327 final Rect dirty = drawable.getBounds(); 8328 final int scrollX = mScrollX; 8329 final int scrollY = mScrollY; 8330 8331 invalidate(dirty.left + scrollX, dirty.top + scrollY, 8332 dirty.right + scrollX, dirty.bottom + scrollY); 8333 } 8334 } 8335 8336 /** 8337 * Schedules an action on a drawable to occur at a specified time. 8338 * 8339 * @param who the recipient of the action 8340 * @param what the action to run on the drawable 8341 * @param when the time at which the action must occur. Uses the 8342 * {@link SystemClock#uptimeMillis} timebase. 8343 */ 8344 public void scheduleDrawable(Drawable who, Runnable what, long when) { 8345 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 8346 mAttachInfo.mHandler.postAtTime(what, who, when); 8347 } 8348 } 8349 8350 /** 8351 * Cancels a scheduled action on a drawable. 8352 * 8353 * @param who the recipient of the action 8354 * @param what the action to cancel 8355 */ 8356 public void unscheduleDrawable(Drawable who, Runnable what) { 8357 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 8358 mAttachInfo.mHandler.removeCallbacks(what, who); 8359 } 8360 } 8361 8362 /** 8363 * Unschedule any events associated with the given Drawable. This can be 8364 * used when selecting a new Drawable into a view, so that the previous 8365 * one is completely unscheduled. 8366 * 8367 * @param who The Drawable to unschedule. 8368 * 8369 * @see #drawableStateChanged 8370 */ 8371 public void unscheduleDrawable(Drawable who) { 8372 if (mAttachInfo != null) { 8373 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 8374 } 8375 } 8376 8377 /** 8378 * If your view subclass is displaying its own Drawable objects, it should 8379 * override this function and return true for any Drawable it is 8380 * displaying. This allows animations for those drawables to be 8381 * scheduled. 8382 * 8383 * <p>Be sure to call through to the super class when overriding this 8384 * function. 8385 * 8386 * @param who The Drawable to verify. Return true if it is one you are 8387 * displaying, else return the result of calling through to the 8388 * super class. 8389 * 8390 * @return boolean If true than the Drawable is being displayed in the 8391 * view; else false and it is not allowed to animate. 8392 * 8393 * @see #unscheduleDrawable 8394 * @see #drawableStateChanged 8395 */ 8396 protected boolean verifyDrawable(Drawable who) { 8397 return who == mBGDrawable; 8398 } 8399 8400 /** 8401 * This function is called whenever the state of the view changes in such 8402 * a way that it impacts the state of drawables being shown. 8403 * 8404 * <p>Be sure to call through to the superclass when overriding this 8405 * function. 8406 * 8407 * @see Drawable#setState 8408 */ 8409 protected void drawableStateChanged() { 8410 Drawable d = mBGDrawable; 8411 if (d != null && d.isStateful()) { 8412 d.setState(getDrawableState()); 8413 } 8414 } 8415 8416 /** 8417 * Call this to force a view to update its drawable state. This will cause 8418 * drawableStateChanged to be called on this view. Views that are interested 8419 * in the new state should call getDrawableState. 8420 * 8421 * @see #drawableStateChanged 8422 * @see #getDrawableState 8423 */ 8424 public void refreshDrawableState() { 8425 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 8426 drawableStateChanged(); 8427 8428 ViewParent parent = mParent; 8429 if (parent != null) { 8430 parent.childDrawableStateChanged(this); 8431 } 8432 } 8433 8434 /** 8435 * Return an array of resource IDs of the drawable states representing the 8436 * current state of the view. 8437 * 8438 * @return The current drawable state 8439 * 8440 * @see Drawable#setState 8441 * @see #drawableStateChanged 8442 * @see #onCreateDrawableState 8443 */ 8444 public final int[] getDrawableState() { 8445 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 8446 return mDrawableState; 8447 } else { 8448 mDrawableState = onCreateDrawableState(0); 8449 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 8450 return mDrawableState; 8451 } 8452 } 8453 8454 /** 8455 * Generate the new {@link android.graphics.drawable.Drawable} state for 8456 * this view. This is called by the view 8457 * system when the cached Drawable state is determined to be invalid. To 8458 * retrieve the current state, you should use {@link #getDrawableState}. 8459 * 8460 * @param extraSpace if non-zero, this is the number of extra entries you 8461 * would like in the returned array in which you can place your own 8462 * states. 8463 * 8464 * @return Returns an array holding the current {@link Drawable} state of 8465 * the view. 8466 * 8467 * @see #mergeDrawableStates 8468 */ 8469 protected int[] onCreateDrawableState(int extraSpace) { 8470 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 8471 mParent instanceof View) { 8472 return ((View) mParent).onCreateDrawableState(extraSpace); 8473 } 8474 8475 int[] drawableState; 8476 8477 int privateFlags = mPrivateFlags; 8478 8479 int viewStateIndex = 0; 8480 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 8481 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 8482 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 8483 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 8484 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 8485 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 8486 8487 drawableState = VIEW_STATE_SETS[viewStateIndex]; 8488 8489 //noinspection ConstantIfStatement 8490 if (false) { 8491 Log.i("View", "drawableStateIndex=" + viewStateIndex); 8492 Log.i("View", toString() 8493 + " pressed=" + ((privateFlags & PRESSED) != 0) 8494 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 8495 + " fo=" + hasFocus() 8496 + " sl=" + ((privateFlags & SELECTED) != 0) 8497 + " wf=" + hasWindowFocus() 8498 + ": " + Arrays.toString(drawableState)); 8499 } 8500 8501 if (extraSpace == 0) { 8502 return drawableState; 8503 } 8504 8505 final int[] fullState; 8506 if (drawableState != null) { 8507 fullState = new int[drawableState.length + extraSpace]; 8508 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 8509 } else { 8510 fullState = new int[extraSpace]; 8511 } 8512 8513 return fullState; 8514 } 8515 8516 /** 8517 * Merge your own state values in <var>additionalState</var> into the base 8518 * state values <var>baseState</var> that were returned by 8519 * {@link #onCreateDrawableState}. 8520 * 8521 * @param baseState The base state values returned by 8522 * {@link #onCreateDrawableState}, which will be modified to also hold your 8523 * own additional state values. 8524 * 8525 * @param additionalState The additional state values you would like 8526 * added to <var>baseState</var>; this array is not modified. 8527 * 8528 * @return As a convenience, the <var>baseState</var> array you originally 8529 * passed into the function is returned. 8530 * 8531 * @see #onCreateDrawableState 8532 */ 8533 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 8534 final int N = baseState.length; 8535 int i = N - 1; 8536 while (i >= 0 && baseState[i] == 0) { 8537 i--; 8538 } 8539 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 8540 return baseState; 8541 } 8542 8543 /** 8544 * Sets the background color for this view. 8545 * @param color the color of the background 8546 */ 8547 @RemotableViewMethod 8548 public void setBackgroundColor(int color) { 8549 setBackgroundDrawable(new ColorDrawable(color)); 8550 } 8551 8552 /** 8553 * Set the background to a given resource. The resource should refer to 8554 * a Drawable object or 0 to remove the background. 8555 * @param resid The identifier of the resource. 8556 * @attr ref android.R.styleable#View_background 8557 */ 8558 @RemotableViewMethod 8559 public void setBackgroundResource(int resid) { 8560 if (resid != 0 && resid == mBackgroundResource) { 8561 return; 8562 } 8563 8564 Drawable d= null; 8565 if (resid != 0) { 8566 d = mResources.getDrawable(resid); 8567 } 8568 setBackgroundDrawable(d); 8569 8570 mBackgroundResource = resid; 8571 } 8572 8573 /** 8574 * Set the background to a given Drawable, or remove the background. If the 8575 * background has padding, this View's padding is set to the background's 8576 * padding. However, when a background is removed, this View's padding isn't 8577 * touched. If setting the padding is desired, please use 8578 * {@link #setPadding(int, int, int, int)}. 8579 * 8580 * @param d The Drawable to use as the background, or null to remove the 8581 * background 8582 */ 8583 public void setBackgroundDrawable(Drawable d) { 8584 boolean requestLayout = false; 8585 8586 mBackgroundResource = 0; 8587 8588 /* 8589 * Regardless of whether we're setting a new background or not, we want 8590 * to clear the previous drawable. 8591 */ 8592 if (mBGDrawable != null) { 8593 mBGDrawable.setCallback(null); 8594 unscheduleDrawable(mBGDrawable); 8595 } 8596 8597 if (d != null) { 8598 Rect padding = sThreadLocal.get(); 8599 if (padding == null) { 8600 padding = new Rect(); 8601 sThreadLocal.set(padding); 8602 } 8603 if (d.getPadding(padding)) { 8604 setPadding(padding.left, padding.top, padding.right, padding.bottom); 8605 } 8606 8607 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 8608 // if it has a different minimum size, we should layout again 8609 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 8610 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 8611 requestLayout = true; 8612 } 8613 8614 d.setCallback(this); 8615 if (d.isStateful()) { 8616 d.setState(getDrawableState()); 8617 } 8618 d.setVisible(getVisibility() == VISIBLE, false); 8619 mBGDrawable = d; 8620 8621 if ((mPrivateFlags & SKIP_DRAW) != 0) { 8622 mPrivateFlags &= ~SKIP_DRAW; 8623 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 8624 requestLayout = true; 8625 } 8626 } else { 8627 /* Remove the background */ 8628 mBGDrawable = null; 8629 8630 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 8631 /* 8632 * This view ONLY drew the background before and we're removing 8633 * the background, so now it won't draw anything 8634 * (hence we SKIP_DRAW) 8635 */ 8636 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 8637 mPrivateFlags |= SKIP_DRAW; 8638 } 8639 8640 /* 8641 * When the background is set, we try to apply its padding to this 8642 * View. When the background is removed, we don't touch this View's 8643 * padding. This is noted in the Javadocs. Hence, we don't need to 8644 * requestLayout(), the invalidate() below is sufficient. 8645 */ 8646 8647 // The old background's minimum size could have affected this 8648 // View's layout, so let's requestLayout 8649 requestLayout = true; 8650 } 8651 8652 computeOpaqueFlags(); 8653 8654 if (requestLayout) { 8655 requestLayout(); 8656 } 8657 8658 mBackgroundSizeChanged = true; 8659 invalidate(); 8660 } 8661 8662 /** 8663 * Gets the background drawable 8664 * @return The drawable used as the background for this view, if any. 8665 */ 8666 public Drawable getBackground() { 8667 return mBGDrawable; 8668 } 8669 8670 /** 8671 * Sets the padding. The view may add on the space required to display 8672 * the scrollbars, depending on the style and visibility of the scrollbars. 8673 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 8674 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 8675 * from the values set in this call. 8676 * 8677 * @attr ref android.R.styleable#View_padding 8678 * @attr ref android.R.styleable#View_paddingBottom 8679 * @attr ref android.R.styleable#View_paddingLeft 8680 * @attr ref android.R.styleable#View_paddingRight 8681 * @attr ref android.R.styleable#View_paddingTop 8682 * @param left the left padding in pixels 8683 * @param top the top padding in pixels 8684 * @param right the right padding in pixels 8685 * @param bottom the bottom padding in pixels 8686 */ 8687 public void setPadding(int left, int top, int right, int bottom) { 8688 boolean changed = false; 8689 8690 mUserPaddingRight = right; 8691 mUserPaddingBottom = bottom; 8692 8693 final int viewFlags = mViewFlags; 8694 8695 // Common case is there are no scroll bars. 8696 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 8697 // TODO: Deal with RTL languages to adjust left padding instead of right. 8698 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 8699 right += (viewFlags & SCROLLBARS_INSET_MASK) == 0 8700 ? 0 : getVerticalScrollbarWidth(); 8701 } 8702 if ((viewFlags & SCROLLBARS_HORIZONTAL) == 0) { 8703 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 8704 ? 0 : getHorizontalScrollbarHeight(); 8705 } 8706 } 8707 8708 if (mPaddingLeft != left) { 8709 changed = true; 8710 mPaddingLeft = left; 8711 } 8712 if (mPaddingTop != top) { 8713 changed = true; 8714 mPaddingTop = top; 8715 } 8716 if (mPaddingRight != right) { 8717 changed = true; 8718 mPaddingRight = right; 8719 } 8720 if (mPaddingBottom != bottom) { 8721 changed = true; 8722 mPaddingBottom = bottom; 8723 } 8724 8725 if (changed) { 8726 requestLayout(); 8727 } 8728 } 8729 8730 /** 8731 * Returns the top padding of this view. 8732 * 8733 * @return the top padding in pixels 8734 */ 8735 public int getPaddingTop() { 8736 return mPaddingTop; 8737 } 8738 8739 /** 8740 * Returns the bottom padding of this view. If there are inset and enabled 8741 * scrollbars, this value may include the space required to display the 8742 * scrollbars as well. 8743 * 8744 * @return the bottom padding in pixels 8745 */ 8746 public int getPaddingBottom() { 8747 return mPaddingBottom; 8748 } 8749 8750 /** 8751 * Returns the left padding of this view. If there are inset and enabled 8752 * scrollbars, this value may include the space required to display the 8753 * scrollbars as well. 8754 * 8755 * @return the left padding in pixels 8756 */ 8757 public int getPaddingLeft() { 8758 return mPaddingLeft; 8759 } 8760 8761 /** 8762 * Returns the right padding of this view. If there are inset and enabled 8763 * scrollbars, this value may include the space required to display the 8764 * scrollbars as well. 8765 * 8766 * @return the right padding in pixels 8767 */ 8768 public int getPaddingRight() { 8769 return mPaddingRight; 8770 } 8771 8772 /** 8773 * Changes the selection state of this view. A view can be selected or not. 8774 * Note that selection is not the same as focus. Views are typically 8775 * selected in the context of an AdapterView like ListView or GridView; 8776 * the selected view is the view that is highlighted. 8777 * 8778 * @param selected true if the view must be selected, false otherwise 8779 */ 8780 public void setSelected(boolean selected) { 8781 if (((mPrivateFlags & SELECTED) != 0) != selected) { 8782 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 8783 if (!selected) resetPressedState(); 8784 invalidate(); 8785 refreshDrawableState(); 8786 dispatchSetSelected(selected); 8787 } 8788 } 8789 8790 /** 8791 * Dispatch setSelected to all of this View's children. 8792 * 8793 * @see #setSelected(boolean) 8794 * 8795 * @param selected The new selected state 8796 */ 8797 protected void dispatchSetSelected(boolean selected) { 8798 } 8799 8800 /** 8801 * Indicates the selection state of this view. 8802 * 8803 * @return true if the view is selected, false otherwise 8804 */ 8805 @ViewDebug.ExportedProperty 8806 public boolean isSelected() { 8807 return (mPrivateFlags & SELECTED) != 0; 8808 } 8809 8810 /** 8811 * Changes the activated state of this view. A view can be activated or not. 8812 * Note that activation is not the same as selection. Selection is 8813 * a transient property, representing the view (hierarchy) the user is 8814 * currently interacting with. Activation is a longer-term state that the 8815 * user can move views in and out of. For example, in a list view with 8816 * single or multiple selection enabled, the views in the current selection 8817 * set are activated. (Um, yeah, we are deeply sorry about the terminology 8818 * here.) The activated state is propagated down to children of the view it 8819 * is set on. 8820 * 8821 * @param activated true if the view must be activated, false otherwise 8822 */ 8823 public void setActivated(boolean activated) { 8824 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 8825 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 8826 invalidate(); 8827 refreshDrawableState(); 8828 dispatchSetActivated(activated); 8829 } 8830 } 8831 8832 /** 8833 * Dispatch setActivated to all of this View's children. 8834 * 8835 * @see #setActivated(boolean) 8836 * 8837 * @param activated The new activated state 8838 */ 8839 protected void dispatchSetActivated(boolean activated) { 8840 } 8841 8842 /** 8843 * Indicates the activation state of this view. 8844 * 8845 * @return true if the view is activated, false otherwise 8846 */ 8847 @ViewDebug.ExportedProperty 8848 public boolean isActivated() { 8849 return (mPrivateFlags & ACTIVATED) != 0; 8850 } 8851 8852 /** 8853 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 8854 * observer can be used to get notifications when global events, like 8855 * layout, happen. 8856 * 8857 * The returned ViewTreeObserver observer is not guaranteed to remain 8858 * valid for the lifetime of this View. If the caller of this method keeps 8859 * a long-lived reference to ViewTreeObserver, it should always check for 8860 * the return value of {@link ViewTreeObserver#isAlive()}. 8861 * 8862 * @return The ViewTreeObserver for this view's hierarchy. 8863 */ 8864 public ViewTreeObserver getViewTreeObserver() { 8865 if (mAttachInfo != null) { 8866 return mAttachInfo.mTreeObserver; 8867 } 8868 if (mFloatingTreeObserver == null) { 8869 mFloatingTreeObserver = new ViewTreeObserver(); 8870 } 8871 return mFloatingTreeObserver; 8872 } 8873 8874 /** 8875 * <p>Finds the topmost view in the current view hierarchy.</p> 8876 * 8877 * @return the topmost view containing this view 8878 */ 8879 public View getRootView() { 8880 if (mAttachInfo != null) { 8881 final View v = mAttachInfo.mRootView; 8882 if (v != null) { 8883 return v; 8884 } 8885 } 8886 8887 View parent = this; 8888 8889 while (parent.mParent != null && parent.mParent instanceof View) { 8890 parent = (View) parent.mParent; 8891 } 8892 8893 return parent; 8894 } 8895 8896 /** 8897 * <p>Computes the coordinates of this view on the screen. The argument 8898 * must be an array of two integers. After the method returns, the array 8899 * contains the x and y location in that order.</p> 8900 * 8901 * @param location an array of two integers in which to hold the coordinates 8902 */ 8903 public void getLocationOnScreen(int[] location) { 8904 getLocationInWindow(location); 8905 8906 final AttachInfo info = mAttachInfo; 8907 if (info != null) { 8908 location[0] += info.mWindowLeft; 8909 location[1] += info.mWindowTop; 8910 } 8911 } 8912 8913 /** 8914 * <p>Computes the coordinates of this view in its window. The argument 8915 * must be an array of two integers. After the method returns, the array 8916 * contains the x and y location in that order.</p> 8917 * 8918 * @param location an array of two integers in which to hold the coordinates 8919 */ 8920 public void getLocationInWindow(int[] location) { 8921 if (location == null || location.length < 2) { 8922 throw new IllegalArgumentException("location must be an array of " 8923 + "two integers"); 8924 } 8925 8926 location[0] = mLeft; 8927 location[1] = mTop; 8928 8929 ViewParent viewParent = mParent; 8930 while (viewParent instanceof View) { 8931 final View view = (View)viewParent; 8932 location[0] += view.mLeft - view.mScrollX; 8933 location[1] += view.mTop - view.mScrollY; 8934 viewParent = view.mParent; 8935 } 8936 8937 if (viewParent instanceof ViewRoot) { 8938 // *cough* 8939 final ViewRoot vr = (ViewRoot)viewParent; 8940 location[1] -= vr.mCurScrollY; 8941 } 8942 } 8943 8944 /** 8945 * {@hide} 8946 * @param id the id of the view to be found 8947 * @return the view of the specified id, null if cannot be found 8948 */ 8949 protected View findViewTraversal(int id) { 8950 if (id == mID) { 8951 return this; 8952 } 8953 return null; 8954 } 8955 8956 /** 8957 * {@hide} 8958 * @param tag the tag of the view to be found 8959 * @return the view of specified tag, null if cannot be found 8960 */ 8961 protected View findViewWithTagTraversal(Object tag) { 8962 if (tag != null && tag.equals(mTag)) { 8963 return this; 8964 } 8965 return null; 8966 } 8967 8968 /** 8969 * Look for a child view with the given id. If this view has the given 8970 * id, return this view. 8971 * 8972 * @param id The id to search for. 8973 * @return The view that has the given id in the hierarchy or null 8974 */ 8975 public final View findViewById(int id) { 8976 if (id < 0) { 8977 return null; 8978 } 8979 return findViewTraversal(id); 8980 } 8981 8982 /** 8983 * Look for a child view with the given tag. If this view has the given 8984 * tag, return this view. 8985 * 8986 * @param tag The tag to search for, using "tag.equals(getTag())". 8987 * @return The View that has the given tag in the hierarchy or null 8988 */ 8989 public final View findViewWithTag(Object tag) { 8990 if (tag == null) { 8991 return null; 8992 } 8993 return findViewWithTagTraversal(tag); 8994 } 8995 8996 /** 8997 * Sets the identifier for this view. The identifier does not have to be 8998 * unique in this view's hierarchy. The identifier should be a positive 8999 * number. 9000 * 9001 * @see #NO_ID 9002 * @see #getId 9003 * @see #findViewById 9004 * 9005 * @param id a number used to identify the view 9006 * 9007 * @attr ref android.R.styleable#View_id 9008 */ 9009 public void setId(int id) { 9010 mID = id; 9011 } 9012 9013 /** 9014 * {@hide} 9015 * 9016 * @param isRoot true if the view belongs to the root namespace, false 9017 * otherwise 9018 */ 9019 public void setIsRootNamespace(boolean isRoot) { 9020 if (isRoot) { 9021 mPrivateFlags |= IS_ROOT_NAMESPACE; 9022 } else { 9023 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 9024 } 9025 } 9026 9027 /** 9028 * {@hide} 9029 * 9030 * @return true if the view belongs to the root namespace, false otherwise 9031 */ 9032 public boolean isRootNamespace() { 9033 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 9034 } 9035 9036 /** 9037 * Returns this view's identifier. 9038 * 9039 * @return a positive integer used to identify the view or {@link #NO_ID} 9040 * if the view has no ID 9041 * 9042 * @see #setId 9043 * @see #findViewById 9044 * @attr ref android.R.styleable#View_id 9045 */ 9046 @ViewDebug.CapturedViewProperty 9047 public int getId() { 9048 return mID; 9049 } 9050 9051 /** 9052 * Returns this view's tag. 9053 * 9054 * @return the Object stored in this view as a tag 9055 * 9056 * @see #setTag(Object) 9057 * @see #getTag(int) 9058 */ 9059 @ViewDebug.ExportedProperty 9060 public Object getTag() { 9061 return mTag; 9062 } 9063 9064 /** 9065 * Sets the tag associated with this view. A tag can be used to mark 9066 * a view in its hierarchy and does not have to be unique within the 9067 * hierarchy. Tags can also be used to store data within a view without 9068 * resorting to another data structure. 9069 * 9070 * @param tag an Object to tag the view with 9071 * 9072 * @see #getTag() 9073 * @see #setTag(int, Object) 9074 */ 9075 public void setTag(final Object tag) { 9076 mTag = tag; 9077 } 9078 9079 /** 9080 * Returns the tag associated with this view and the specified key. 9081 * 9082 * @param key The key identifying the tag 9083 * 9084 * @return the Object stored in this view as a tag 9085 * 9086 * @see #setTag(int, Object) 9087 * @see #getTag() 9088 */ 9089 public Object getTag(int key) { 9090 SparseArray<Object> tags = null; 9091 synchronized (sTagsLock) { 9092 if (sTags != null) { 9093 tags = sTags.get(this); 9094 } 9095 } 9096 9097 if (tags != null) return tags.get(key); 9098 return null; 9099 } 9100 9101 /** 9102 * Sets a tag associated with this view and a key. A tag can be used 9103 * to mark a view in its hierarchy and does not have to be unique within 9104 * the hierarchy. Tags can also be used to store data within a view 9105 * without resorting to another data structure. 9106 * 9107 * The specified key should be an id declared in the resources of the 9108 * application to ensure it is unique (see the <a 9109 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 9110 * Keys identified as belonging to 9111 * the Android framework or not associated with any package will cause 9112 * an {@link IllegalArgumentException} to be thrown. 9113 * 9114 * @param key The key identifying the tag 9115 * @param tag An Object to tag the view with 9116 * 9117 * @throws IllegalArgumentException If they specified key is not valid 9118 * 9119 * @see #setTag(Object) 9120 * @see #getTag(int) 9121 */ 9122 public void setTag(int key, final Object tag) { 9123 // If the package id is 0x00 or 0x01, it's either an undefined package 9124 // or a framework id 9125 if ((key >>> 24) < 2) { 9126 throw new IllegalArgumentException("The key must be an application-specific " 9127 + "resource id."); 9128 } 9129 9130 setTagInternal(this, key, tag); 9131 } 9132 9133 /** 9134 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 9135 * framework id. 9136 * 9137 * @hide 9138 */ 9139 public void setTagInternal(int key, Object tag) { 9140 if ((key >>> 24) != 0x1) { 9141 throw new IllegalArgumentException("The key must be a framework-specific " 9142 + "resource id."); 9143 } 9144 9145 setTagInternal(this, key, tag); 9146 } 9147 9148 private static void setTagInternal(View view, int key, Object tag) { 9149 SparseArray<Object> tags = null; 9150 synchronized (sTagsLock) { 9151 if (sTags == null) { 9152 sTags = new WeakHashMap<View, SparseArray<Object>>(); 9153 } else { 9154 tags = sTags.get(view); 9155 } 9156 } 9157 9158 if (tags == null) { 9159 tags = new SparseArray<Object>(2); 9160 synchronized (sTagsLock) { 9161 sTags.put(view, tags); 9162 } 9163 } 9164 9165 tags.put(key, tag); 9166 } 9167 9168 /** 9169 * @param consistency The type of consistency. See ViewDebug for more information. 9170 * 9171 * @hide 9172 */ 9173 protected boolean dispatchConsistencyCheck(int consistency) { 9174 return onConsistencyCheck(consistency); 9175 } 9176 9177 /** 9178 * Method that subclasses should implement to check their consistency. The type of 9179 * consistency check is indicated by the bit field passed as a parameter. 9180 * 9181 * @param consistency The type of consistency. See ViewDebug for more information. 9182 * 9183 * @throws IllegalStateException if the view is in an inconsistent state. 9184 * 9185 * @hide 9186 */ 9187 protected boolean onConsistencyCheck(int consistency) { 9188 boolean result = true; 9189 9190 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 9191 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 9192 9193 if (checkLayout) { 9194 if (getParent() == null) { 9195 result = false; 9196 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 9197 "View " + this + " does not have a parent."); 9198 } 9199 9200 if (mAttachInfo == null) { 9201 result = false; 9202 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 9203 "View " + this + " is not attached to a window."); 9204 } 9205 } 9206 9207 if (checkDrawing) { 9208 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 9209 // from their draw() method 9210 9211 if ((mPrivateFlags & DRAWN) != DRAWN && 9212 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 9213 result = false; 9214 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 9215 "View " + this + " was invalidated but its drawing cache is valid."); 9216 } 9217 } 9218 9219 return result; 9220 } 9221 9222 /** 9223 * Prints information about this view in the log output, with the tag 9224 * {@link #VIEW_LOG_TAG}. 9225 * 9226 * @hide 9227 */ 9228 public void debug() { 9229 debug(0); 9230 } 9231 9232 /** 9233 * Prints information about this view in the log output, with the tag 9234 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 9235 * indentation defined by the <code>depth</code>. 9236 * 9237 * @param depth the indentation level 9238 * 9239 * @hide 9240 */ 9241 protected void debug(int depth) { 9242 String output = debugIndent(depth - 1); 9243 9244 output += "+ " + this; 9245 int id = getId(); 9246 if (id != -1) { 9247 output += " (id=" + id + ")"; 9248 } 9249 Object tag = getTag(); 9250 if (tag != null) { 9251 output += " (tag=" + tag + ")"; 9252 } 9253 Log.d(VIEW_LOG_TAG, output); 9254 9255 if ((mPrivateFlags & FOCUSED) != 0) { 9256 output = debugIndent(depth) + " FOCUSED"; 9257 Log.d(VIEW_LOG_TAG, output); 9258 } 9259 9260 output = debugIndent(depth); 9261 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 9262 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 9263 + "} "; 9264 Log.d(VIEW_LOG_TAG, output); 9265 9266 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 9267 || mPaddingBottom != 0) { 9268 output = debugIndent(depth); 9269 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 9270 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 9271 Log.d(VIEW_LOG_TAG, output); 9272 } 9273 9274 output = debugIndent(depth); 9275 output += "mMeasureWidth=" + mMeasuredWidth + 9276 " mMeasureHeight=" + mMeasuredHeight; 9277 Log.d(VIEW_LOG_TAG, output); 9278 9279 output = debugIndent(depth); 9280 if (mLayoutParams == null) { 9281 output += "BAD! no layout params"; 9282 } else { 9283 output = mLayoutParams.debug(output); 9284 } 9285 Log.d(VIEW_LOG_TAG, output); 9286 9287 output = debugIndent(depth); 9288 output += "flags={"; 9289 output += View.printFlags(mViewFlags); 9290 output += "}"; 9291 Log.d(VIEW_LOG_TAG, output); 9292 9293 output = debugIndent(depth); 9294 output += "privateFlags={"; 9295 output += View.printPrivateFlags(mPrivateFlags); 9296 output += "}"; 9297 Log.d(VIEW_LOG_TAG, output); 9298 } 9299 9300 /** 9301 * Creates an string of whitespaces used for indentation. 9302 * 9303 * @param depth the indentation level 9304 * @return a String containing (depth * 2 + 3) * 2 white spaces 9305 * 9306 * @hide 9307 */ 9308 protected static String debugIndent(int depth) { 9309 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 9310 for (int i = 0; i < (depth * 2) + 3; i++) { 9311 spaces.append(' ').append(' '); 9312 } 9313 return spaces.toString(); 9314 } 9315 9316 /** 9317 * <p>Return the offset of the widget's text baseline from the widget's top 9318 * boundary. If this widget does not support baseline alignment, this 9319 * method returns -1. </p> 9320 * 9321 * @return the offset of the baseline within the widget's bounds or -1 9322 * if baseline alignment is not supported 9323 */ 9324 @ViewDebug.ExportedProperty(category = "layout") 9325 public int getBaseline() { 9326 return -1; 9327 } 9328 9329 /** 9330 * Call this when something has changed which has invalidated the 9331 * layout of this view. This will schedule a layout pass of the view 9332 * tree. 9333 */ 9334 public void requestLayout() { 9335 if (ViewDebug.TRACE_HIERARCHY) { 9336 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 9337 } 9338 9339 mPrivateFlags |= FORCE_LAYOUT; 9340 9341 if (mParent != null && !mParent.isLayoutRequested()) { 9342 mParent.requestLayout(); 9343 } 9344 } 9345 9346 /** 9347 * Forces this view to be laid out during the next layout pass. 9348 * This method does not call requestLayout() or forceLayout() 9349 * on the parent. 9350 */ 9351 public void forceLayout() { 9352 mPrivateFlags |= FORCE_LAYOUT; 9353 } 9354 9355 /** 9356 * <p> 9357 * This is called to find out how big a view should be. The parent 9358 * supplies constraint information in the width and height parameters. 9359 * </p> 9360 * 9361 * <p> 9362 * The actual mesurement work of a view is performed in 9363 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 9364 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 9365 * </p> 9366 * 9367 * 9368 * @param widthMeasureSpec Horizontal space requirements as imposed by the 9369 * parent 9370 * @param heightMeasureSpec Vertical space requirements as imposed by the 9371 * parent 9372 * 9373 * @see #onMeasure(int, int) 9374 */ 9375 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 9376 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 9377 widthMeasureSpec != mOldWidthMeasureSpec || 9378 heightMeasureSpec != mOldHeightMeasureSpec) { 9379 9380 // first clears the measured dimension flag 9381 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 9382 9383 if (ViewDebug.TRACE_HIERARCHY) { 9384 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 9385 } 9386 9387 // measure ourselves, this should set the measured dimension flag back 9388 onMeasure(widthMeasureSpec, heightMeasureSpec); 9389 9390 // flag not set, setMeasuredDimension() was not invoked, we raise 9391 // an exception to warn the developer 9392 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 9393 throw new IllegalStateException("onMeasure() did not set the" 9394 + " measured dimension by calling" 9395 + " setMeasuredDimension()"); 9396 } 9397 9398 mPrivateFlags |= LAYOUT_REQUIRED; 9399 } 9400 9401 mOldWidthMeasureSpec = widthMeasureSpec; 9402 mOldHeightMeasureSpec = heightMeasureSpec; 9403 } 9404 9405 /** 9406 * <p> 9407 * Measure the view and its content to determine the measured width and the 9408 * measured height. This method is invoked by {@link #measure(int, int)} and 9409 * should be overriden by subclasses to provide accurate and efficient 9410 * measurement of their contents. 9411 * </p> 9412 * 9413 * <p> 9414 * <strong>CONTRACT:</strong> When overriding this method, you 9415 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 9416 * measured width and height of this view. Failure to do so will trigger an 9417 * <code>IllegalStateException</code>, thrown by 9418 * {@link #measure(int, int)}. Calling the superclass' 9419 * {@link #onMeasure(int, int)} is a valid use. 9420 * </p> 9421 * 9422 * <p> 9423 * The base class implementation of measure defaults to the background size, 9424 * unless a larger size is allowed by the MeasureSpec. Subclasses should 9425 * override {@link #onMeasure(int, int)} to provide better measurements of 9426 * their content. 9427 * </p> 9428 * 9429 * <p> 9430 * If this method is overridden, it is the subclass's responsibility to make 9431 * sure the measured height and width are at least the view's minimum height 9432 * and width ({@link #getSuggestedMinimumHeight()} and 9433 * {@link #getSuggestedMinimumWidth()}). 9434 * </p> 9435 * 9436 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 9437 * The requirements are encoded with 9438 * {@link android.view.View.MeasureSpec}. 9439 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 9440 * The requirements are encoded with 9441 * {@link android.view.View.MeasureSpec}. 9442 * 9443 * @see #getMeasuredWidth() 9444 * @see #getMeasuredHeight() 9445 * @see #setMeasuredDimension(int, int) 9446 * @see #getSuggestedMinimumHeight() 9447 * @see #getSuggestedMinimumWidth() 9448 * @see android.view.View.MeasureSpec#getMode(int) 9449 * @see android.view.View.MeasureSpec#getSize(int) 9450 */ 9451 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 9452 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 9453 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 9454 } 9455 9456 /** 9457 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 9458 * measured width and measured height. Failing to do so will trigger an 9459 * exception at measurement time.</p> 9460 * 9461 * @param measuredWidth the measured width of this view 9462 * @param measuredHeight the measured height of this view 9463 */ 9464 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 9465 mMeasuredWidth = measuredWidth; 9466 mMeasuredHeight = measuredHeight; 9467 9468 mPrivateFlags |= MEASURED_DIMENSION_SET; 9469 } 9470 9471 /** 9472 * Utility to reconcile a desired size with constraints imposed by a MeasureSpec. 9473 * Will take the desired size, unless a different size is imposed by the constraints. 9474 * 9475 * @param size How big the view wants to be 9476 * @param measureSpec Constraints imposed by the parent 9477 * @return The size this view should be. 9478 */ 9479 public static int resolveSize(int size, int measureSpec) { 9480 int result = size; 9481 int specMode = MeasureSpec.getMode(measureSpec); 9482 int specSize = MeasureSpec.getSize(measureSpec); 9483 switch (specMode) { 9484 case MeasureSpec.UNSPECIFIED: 9485 result = size; 9486 break; 9487 case MeasureSpec.AT_MOST: 9488 result = Math.min(size, specSize); 9489 break; 9490 case MeasureSpec.EXACTLY: 9491 result = specSize; 9492 break; 9493 } 9494 return result; 9495 } 9496 9497 /** 9498 * Utility to return a default size. Uses the supplied size if the 9499 * MeasureSpec imposed no contraints. Will get larger if allowed 9500 * by the MeasureSpec. 9501 * 9502 * @param size Default size for this view 9503 * @param measureSpec Constraints imposed by the parent 9504 * @return The size this view should be. 9505 */ 9506 public static int getDefaultSize(int size, int measureSpec) { 9507 int result = size; 9508 int specMode = MeasureSpec.getMode(measureSpec); 9509 int specSize = MeasureSpec.getSize(measureSpec); 9510 9511 switch (specMode) { 9512 case MeasureSpec.UNSPECIFIED: 9513 result = size; 9514 break; 9515 case MeasureSpec.AT_MOST: 9516 case MeasureSpec.EXACTLY: 9517 result = specSize; 9518 break; 9519 } 9520 return result; 9521 } 9522 9523 /** 9524 * Returns the suggested minimum height that the view should use. This 9525 * returns the maximum of the view's minimum height 9526 * and the background's minimum height 9527 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 9528 * <p> 9529 * When being used in {@link #onMeasure(int, int)}, the caller should still 9530 * ensure the returned height is within the requirements of the parent. 9531 * 9532 * @return The suggested minimum height of the view. 9533 */ 9534 protected int getSuggestedMinimumHeight() { 9535 int suggestedMinHeight = mMinHeight; 9536 9537 if (mBGDrawable != null) { 9538 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 9539 if (suggestedMinHeight < bgMinHeight) { 9540 suggestedMinHeight = bgMinHeight; 9541 } 9542 } 9543 9544 return suggestedMinHeight; 9545 } 9546 9547 /** 9548 * Returns the suggested minimum width that the view should use. This 9549 * returns the maximum of the view's minimum width) 9550 * and the background's minimum width 9551 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 9552 * <p> 9553 * When being used in {@link #onMeasure(int, int)}, the caller should still 9554 * ensure the returned width is within the requirements of the parent. 9555 * 9556 * @return The suggested minimum width of the view. 9557 */ 9558 protected int getSuggestedMinimumWidth() { 9559 int suggestedMinWidth = mMinWidth; 9560 9561 if (mBGDrawable != null) { 9562 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 9563 if (suggestedMinWidth < bgMinWidth) { 9564 suggestedMinWidth = bgMinWidth; 9565 } 9566 } 9567 9568 return suggestedMinWidth; 9569 } 9570 9571 /** 9572 * Sets the minimum height of the view. It is not guaranteed the view will 9573 * be able to achieve this minimum height (for example, if its parent layout 9574 * constrains it with less available height). 9575 * 9576 * @param minHeight The minimum height the view will try to be. 9577 */ 9578 public void setMinimumHeight(int minHeight) { 9579 mMinHeight = minHeight; 9580 } 9581 9582 /** 9583 * Sets the minimum width of the view. It is not guaranteed the view will 9584 * be able to achieve this minimum width (for example, if its parent layout 9585 * constrains it with less available width). 9586 * 9587 * @param minWidth The minimum width the view will try to be. 9588 */ 9589 public void setMinimumWidth(int minWidth) { 9590 mMinWidth = minWidth; 9591 } 9592 9593 /** 9594 * Get the animation currently associated with this view. 9595 * 9596 * @return The animation that is currently playing or 9597 * scheduled to play for this view. 9598 */ 9599 public Animation getAnimation() { 9600 return mCurrentAnimation; 9601 } 9602 9603 /** 9604 * Start the specified animation now. 9605 * 9606 * @param animation the animation to start now 9607 */ 9608 public void startAnimation(Animation animation) { 9609 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 9610 setAnimation(animation); 9611 invalidate(); 9612 } 9613 9614 /** 9615 * Cancels any animations for this view. 9616 */ 9617 public void clearAnimation() { 9618 if (mCurrentAnimation != null) { 9619 mCurrentAnimation.detach(); 9620 } 9621 mCurrentAnimation = null; 9622 } 9623 9624 /** 9625 * Sets the next animation to play for this view. 9626 * If you want the animation to play immediately, use 9627 * startAnimation. This method provides allows fine-grained 9628 * control over the start time and invalidation, but you 9629 * must make sure that 1) the animation has a start time set, and 9630 * 2) the view will be invalidated when the animation is supposed to 9631 * start. 9632 * 9633 * @param animation The next animation, or null. 9634 */ 9635 public void setAnimation(Animation animation) { 9636 mCurrentAnimation = animation; 9637 if (animation != null) { 9638 animation.reset(); 9639 } 9640 } 9641 9642 /** 9643 * Invoked by a parent ViewGroup to notify the start of the animation 9644 * currently associated with this view. If you override this method, 9645 * always call super.onAnimationStart(); 9646 * 9647 * @see #setAnimation(android.view.animation.Animation) 9648 * @see #getAnimation() 9649 */ 9650 protected void onAnimationStart() { 9651 mPrivateFlags |= ANIMATION_STARTED; 9652 } 9653 9654 /** 9655 * Invoked by a parent ViewGroup to notify the end of the animation 9656 * currently associated with this view. If you override this method, 9657 * always call super.onAnimationEnd(); 9658 * 9659 * @see #setAnimation(android.view.animation.Animation) 9660 * @see #getAnimation() 9661 */ 9662 protected void onAnimationEnd() { 9663 mPrivateFlags &= ~ANIMATION_STARTED; 9664 } 9665 9666 /** 9667 * Invoked if there is a Transform that involves alpha. Subclass that can 9668 * draw themselves with the specified alpha should return true, and then 9669 * respect that alpha when their onDraw() is called. If this returns false 9670 * then the view may be redirected to draw into an offscreen buffer to 9671 * fulfill the request, which will look fine, but may be slower than if the 9672 * subclass handles it internally. The default implementation returns false. 9673 * 9674 * @param alpha The alpha (0..255) to apply to the view's drawing 9675 * @return true if the view can draw with the specified alpha. 9676 */ 9677 protected boolean onSetAlpha(int alpha) { 9678 return false; 9679 } 9680 9681 /** 9682 * This is used by the RootView to perform an optimization when 9683 * the view hierarchy contains one or several SurfaceView. 9684 * SurfaceView is always considered transparent, but its children are not, 9685 * therefore all View objects remove themselves from the global transparent 9686 * region (passed as a parameter to this function). 9687 * 9688 * @param region The transparent region for this ViewRoot (window). 9689 * 9690 * @return Returns true if the effective visibility of the view at this 9691 * point is opaque, regardless of the transparent region; returns false 9692 * if it is possible for underlying windows to be seen behind the view. 9693 * 9694 * {@hide} 9695 */ 9696 public boolean gatherTransparentRegion(Region region) { 9697 final AttachInfo attachInfo = mAttachInfo; 9698 if (region != null && attachInfo != null) { 9699 final int pflags = mPrivateFlags; 9700 if ((pflags & SKIP_DRAW) == 0) { 9701 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 9702 // remove it from the transparent region. 9703 final int[] location = attachInfo.mTransparentLocation; 9704 getLocationInWindow(location); 9705 region.op(location[0], location[1], location[0] + mRight - mLeft, 9706 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 9707 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 9708 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 9709 // exists, so we remove the background drawable's non-transparent 9710 // parts from this transparent region. 9711 applyDrawableToTransparentRegion(mBGDrawable, region); 9712 } 9713 } 9714 return true; 9715 } 9716 9717 /** 9718 * Play a sound effect for this view. 9719 * 9720 * <p>The framework will play sound effects for some built in actions, such as 9721 * clicking, but you may wish to play these effects in your widget, 9722 * for instance, for internal navigation. 9723 * 9724 * <p>The sound effect will only be played if sound effects are enabled by the user, and 9725 * {@link #isSoundEffectsEnabled()} is true. 9726 * 9727 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 9728 */ 9729 public void playSoundEffect(int soundConstant) { 9730 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 9731 return; 9732 } 9733 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 9734 } 9735 9736 /** 9737 * BZZZTT!!1! 9738 * 9739 * <p>Provide haptic feedback to the user for this view. 9740 * 9741 * <p>The framework will provide haptic feedback for some built in actions, 9742 * such as long presses, but you may wish to provide feedback for your 9743 * own widget. 9744 * 9745 * <p>The feedback will only be performed if 9746 * {@link #isHapticFeedbackEnabled()} is true. 9747 * 9748 * @param feedbackConstant One of the constants defined in 9749 * {@link HapticFeedbackConstants} 9750 */ 9751 public boolean performHapticFeedback(int feedbackConstant) { 9752 return performHapticFeedback(feedbackConstant, 0); 9753 } 9754 9755 /** 9756 * BZZZTT!!1! 9757 * 9758 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 9759 * 9760 * @param feedbackConstant One of the constants defined in 9761 * {@link HapticFeedbackConstants} 9762 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 9763 */ 9764 public boolean performHapticFeedback(int feedbackConstant, int flags) { 9765 if (mAttachInfo == null) { 9766 return false; 9767 } 9768 //noinspection SimplifiableIfStatement 9769 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 9770 && !isHapticFeedbackEnabled()) { 9771 return false; 9772 } 9773 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 9774 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 9775 } 9776 9777 /** 9778 * Drag and drop. App calls startDrag(), then callbacks to onMeasureDragThumbnail() 9779 * and onDrawDragThumbnail() happen, then the drag operation is handed over to the 9780 * OS. 9781 * !!! TODO: real docs 9782 * @hide 9783 */ 9784 public final boolean startDrag(ClipData data, float touchX, float touchY, 9785 float thumbnailTouchX, float thumbnailTouchY, boolean myWindowOnly) { 9786 if (DEBUG_DRAG) { 9787 Log.d(VIEW_LOG_TAG, "startDrag: touch=(" + touchX + "," + touchY 9788 + ") thumb=(" + thumbnailTouchX + "," + thumbnailTouchY 9789 + ") data=" + data + " local=" + myWindowOnly); 9790 } 9791 boolean okay = false; 9792 9793 measureThumbnail(); // throws if the view fails to specify dimensions 9794 9795 Surface surface = new Surface(); 9796 try { 9797 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 9798 myWindowOnly, mThumbnailWidth, mThumbnailHeight, surface); 9799 if (DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 9800 + " surface=" + surface); 9801 if (token != null) { 9802 Canvas canvas = surface.lockCanvas(null); 9803 onDrawDragThumbnail(canvas); 9804 surface.unlockCanvasAndPost(canvas); 9805 9806 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 9807 touchX, touchY, thumbnailTouchX, thumbnailTouchX, data); 9808 if (DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 9809 } 9810 } catch (Exception e) { 9811 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 9812 surface.destroy(); 9813 } 9814 9815 return okay; 9816 } 9817 9818 private void measureThumbnail() { 9819 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 9820 9821 onMeasureDragThumbnail(); 9822 9823 // flag not set, setDragThumbnailDimension() was not invoked, we raise 9824 // an exception to warn the developer 9825 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 9826 throw new IllegalStateException("onMeasureDragThumbnail() did not set the" 9827 + " measured dimension by calling setDragThumbnailDimension()"); 9828 } 9829 9830 if (DEBUG_DRAG) { 9831 Log.d(VIEW_LOG_TAG, "Drag thumb measured: w=" + mThumbnailWidth 9832 + " h=" + mThumbnailHeight); 9833 } 9834 } 9835 9836 /** 9837 * The View must call this method from onMeasureDragThumbnail() in order to 9838 * specify the dimensions of the drag thumbnail image. 9839 * 9840 * @param width 9841 * @param height 9842 */ 9843 protected final void setDragThumbnailDimension(int width, int height) { 9844 mPrivateFlags |= MEASURED_DIMENSION_SET; 9845 mThumbnailWidth = width; 9846 mThumbnailHeight = height; 9847 } 9848 9849 /** 9850 * The default implementation specifies a drag thumbnail that matches the 9851 * View's current size and appearance. 9852 */ 9853 protected void onMeasureDragThumbnail() { 9854 setDragThumbnailDimension(getWidth(), getHeight()); 9855 } 9856 9857 /** 9858 * The default implementation just draws the current View appearance as the thumbnail 9859 * @param canvas 9860 */ 9861 protected void onDrawDragThumbnail(Canvas canvas) { 9862 draw(canvas); 9863 } 9864 9865 /** 9866 * Drag-and-drop event dispatch. The event.getAction() verb is one of the DragEvent 9867 * constants DRAG_STARTED_EVENT, DRAG_EVENT, DROP_EVENT, and DRAG_ENDED_EVENT. 9868 * 9869 * For DRAG_STARTED_EVENT, event.getClipDescription() describes the content 9870 * being dragged. onDragEvent() should return 'true' if the view can handle 9871 * a drop of that content. A view that returns 'false' here will receive no 9872 * further calls to onDragEvent() about the drag/drop operation. 9873 * 9874 * For DRAG_ENTERED, event.getClipDescription() describes the content being 9875 * dragged. This will be the same content description passed in the 9876 * DRAG_STARTED_EVENT invocation. 9877 * 9878 * For DRAG_EXITED, event.getClipDescription() describes the content being 9879 * dragged. This will be the same content description passed in the 9880 * DRAG_STARTED_EVENT invocation. The view should return to its approriate 9881 * drag-acceptance visual state. 9882 * 9883 * For DRAG_LOCATION_EVENT, event.getX() and event.getY() give the location in View 9884 * coordinates of the current drag point. The view must return 'true' if it 9885 * can accept a drop of the current drag content, false otherwise. 9886 * 9887 * For DROP_EVENT, event.getX() and event.getY() give the location of the drop 9888 * within the view; also, event.getClipData() returns the full data payload 9889 * being dropped. The view should return 'true' if it consumed the dropped 9890 * content, 'false' if it did not. 9891 * 9892 * For DRAG_ENDED_EVENT, the 'event' argument may be null. The view should return 9893 * to its normal visual state. 9894 */ 9895 protected boolean onDragEvent(DragEvent event) { 9896 return false; 9897 } 9898 9899 /** 9900 * Views typically don't need to override dispatchDragEvent(); it just calls 9901 * onDragEvent(what, event) and passes the result up appropriately. 9902 * 9903 */ 9904 public boolean dispatchDragEvent(DragEvent event) { 9905 return onDragEvent(event); 9906 } 9907 9908 /** 9909 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 9910 * it is ever exposed at all. 9911 * @hide 9912 */ 9913 public void onCloseSystemDialogs(String reason) { 9914 } 9915 9916 /** 9917 * Given a Drawable whose bounds have been set to draw into this view, 9918 * update a Region being computed for {@link #gatherTransparentRegion} so 9919 * that any non-transparent parts of the Drawable are removed from the 9920 * given transparent region. 9921 * 9922 * @param dr The Drawable whose transparency is to be applied to the region. 9923 * @param region A Region holding the current transparency information, 9924 * where any parts of the region that are set are considered to be 9925 * transparent. On return, this region will be modified to have the 9926 * transparency information reduced by the corresponding parts of the 9927 * Drawable that are not transparent. 9928 * {@hide} 9929 */ 9930 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 9931 if (DBG) { 9932 Log.i("View", "Getting transparent region for: " + this); 9933 } 9934 final Region r = dr.getTransparentRegion(); 9935 final Rect db = dr.getBounds(); 9936 final AttachInfo attachInfo = mAttachInfo; 9937 if (r != null && attachInfo != null) { 9938 final int w = getRight()-getLeft(); 9939 final int h = getBottom()-getTop(); 9940 if (db.left > 0) { 9941 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 9942 r.op(0, 0, db.left, h, Region.Op.UNION); 9943 } 9944 if (db.right < w) { 9945 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 9946 r.op(db.right, 0, w, h, Region.Op.UNION); 9947 } 9948 if (db.top > 0) { 9949 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 9950 r.op(0, 0, w, db.top, Region.Op.UNION); 9951 } 9952 if (db.bottom < h) { 9953 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 9954 r.op(0, db.bottom, w, h, Region.Op.UNION); 9955 } 9956 final int[] location = attachInfo.mTransparentLocation; 9957 getLocationInWindow(location); 9958 r.translate(location[0], location[1]); 9959 region.op(r, Region.Op.INTERSECT); 9960 } else { 9961 region.op(db, Region.Op.DIFFERENCE); 9962 } 9963 } 9964 9965 private void postCheckForLongClick(int delayOffset) { 9966 mHasPerformedLongPress = false; 9967 9968 if (mPendingCheckForLongPress == null) { 9969 mPendingCheckForLongPress = new CheckForLongPress(); 9970 } 9971 mPendingCheckForLongPress.rememberWindowAttachCount(); 9972 postDelayed(mPendingCheckForLongPress, 9973 ViewConfiguration.getLongPressTimeout() - delayOffset); 9974 } 9975 9976 private static int[] stateSetUnion(final int[] stateSet1, final int[] stateSet2) { 9977 final int stateSet1Length = stateSet1.length; 9978 final int stateSet2Length = stateSet2.length; 9979 final int[] newSet = new int[stateSet1Length + stateSet2Length]; 9980 int k = 0; 9981 int i = 0; 9982 int j = 0; 9983 // This is a merge of the two input state sets and assumes that the 9984 // input sets are sorted by the order imposed by ViewDrawableStates. 9985 for (int viewState : R.styleable.ViewDrawableStates) { 9986 if (i < stateSet1Length && stateSet1[i] == viewState) { 9987 newSet[k++] = viewState; 9988 i++; 9989 } else if (j < stateSet2Length && stateSet2[j] == viewState) { 9990 newSet[k++] = viewState; 9991 j++; 9992 } 9993 if (k > 1) { 9994 assert(newSet[k - 1] > newSet[k - 2]); 9995 } 9996 } 9997 return newSet; 9998 } 9999 10000 /** 10001 * Inflate a view from an XML resource. This convenience method wraps the {@link 10002 * LayoutInflater} class, which provides a full range of options for view inflation. 10003 * 10004 * @param context The Context object for your activity or application. 10005 * @param resource The resource ID to inflate 10006 * @param root A view group that will be the parent. Used to properly inflate the 10007 * layout_* parameters. 10008 * @see LayoutInflater 10009 */ 10010 public static View inflate(Context context, int resource, ViewGroup root) { 10011 LayoutInflater factory = LayoutInflater.from(context); 10012 return factory.inflate(resource, root); 10013 } 10014 10015 /** 10016 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 10017 * Each MeasureSpec represents a requirement for either the width or the height. 10018 * A MeasureSpec is comprised of a size and a mode. There are three possible 10019 * modes: 10020 * <dl> 10021 * <dt>UNSPECIFIED</dt> 10022 * <dd> 10023 * The parent has not imposed any constraint on the child. It can be whatever size 10024 * it wants. 10025 * </dd> 10026 * 10027 * <dt>EXACTLY</dt> 10028 * <dd> 10029 * The parent has determined an exact size for the child. The child is going to be 10030 * given those bounds regardless of how big it wants to be. 10031 * </dd> 10032 * 10033 * <dt>AT_MOST</dt> 10034 * <dd> 10035 * The child can be as large as it wants up to the specified size. 10036 * </dd> 10037 * </dl> 10038 * 10039 * MeasureSpecs are implemented as ints to reduce object allocation. This class 10040 * is provided to pack and unpack the <size, mode> tuple into the int. 10041 */ 10042 public static class MeasureSpec { 10043 private static final int MODE_SHIFT = 30; 10044 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 10045 10046 /** 10047 * Measure specification mode: The parent has not imposed any constraint 10048 * on the child. It can be whatever size it wants. 10049 */ 10050 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 10051 10052 /** 10053 * Measure specification mode: The parent has determined an exact size 10054 * for the child. The child is going to be given those bounds regardless 10055 * of how big it wants to be. 10056 */ 10057 public static final int EXACTLY = 1 << MODE_SHIFT; 10058 10059 /** 10060 * Measure specification mode: The child can be as large as it wants up 10061 * to the specified size. 10062 */ 10063 public static final int AT_MOST = 2 << MODE_SHIFT; 10064 10065 /** 10066 * Creates a measure specification based on the supplied size and mode. 10067 * 10068 * The mode must always be one of the following: 10069 * <ul> 10070 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 10071 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 10072 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 10073 * </ul> 10074 * 10075 * @param size the size of the measure specification 10076 * @param mode the mode of the measure specification 10077 * @return the measure specification based on size and mode 10078 */ 10079 public static int makeMeasureSpec(int size, int mode) { 10080 return size + mode; 10081 } 10082 10083 /** 10084 * Extracts the mode from the supplied measure specification. 10085 * 10086 * @param measureSpec the measure specification to extract the mode from 10087 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 10088 * {@link android.view.View.MeasureSpec#AT_MOST} or 10089 * {@link android.view.View.MeasureSpec#EXACTLY} 10090 */ 10091 public static int getMode(int measureSpec) { 10092 return (measureSpec & MODE_MASK); 10093 } 10094 10095 /** 10096 * Extracts the size from the supplied measure specification. 10097 * 10098 * @param measureSpec the measure specification to extract the size from 10099 * @return the size in pixels defined in the supplied measure specification 10100 */ 10101 public static int getSize(int measureSpec) { 10102 return (measureSpec & ~MODE_MASK); 10103 } 10104 10105 /** 10106 * Returns a String representation of the specified measure 10107 * specification. 10108 * 10109 * @param measureSpec the measure specification to convert to a String 10110 * @return a String with the following format: "MeasureSpec: MODE SIZE" 10111 */ 10112 public static String toString(int measureSpec) { 10113 int mode = getMode(measureSpec); 10114 int size = getSize(measureSpec); 10115 10116 StringBuilder sb = new StringBuilder("MeasureSpec: "); 10117 10118 if (mode == UNSPECIFIED) 10119 sb.append("UNSPECIFIED "); 10120 else if (mode == EXACTLY) 10121 sb.append("EXACTLY "); 10122 else if (mode == AT_MOST) 10123 sb.append("AT_MOST "); 10124 else 10125 sb.append(mode).append(" "); 10126 10127 sb.append(size); 10128 return sb.toString(); 10129 } 10130 } 10131 10132 class CheckForLongPress implements Runnable { 10133 10134 private int mOriginalWindowAttachCount; 10135 10136 public void run() { 10137 if (isPressed() && (mParent != null) 10138 && mOriginalWindowAttachCount == mWindowAttachCount) { 10139 if (performLongClick()) { 10140 mHasPerformedLongPress = true; 10141 } 10142 } 10143 } 10144 10145 public void rememberWindowAttachCount() { 10146 mOriginalWindowAttachCount = mWindowAttachCount; 10147 } 10148 } 10149 10150 private final class CheckForTap implements Runnable { 10151 public void run() { 10152 mPrivateFlags &= ~PREPRESSED; 10153 mPrivateFlags |= PRESSED; 10154 refreshDrawableState(); 10155 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 10156 postCheckForLongClick(ViewConfiguration.getTapTimeout()); 10157 } 10158 } 10159 } 10160 10161 private final class PerformClick implements Runnable { 10162 public void run() { 10163 performClick(); 10164 } 10165 } 10166 10167 /** 10168 * Interface definition for a callback to be invoked when a key event is 10169 * dispatched to this view. The callback will be invoked before the key 10170 * event is given to the view. 10171 */ 10172 public interface OnKeyListener { 10173 /** 10174 * Called when a key is dispatched to a view. This allows listeners to 10175 * get a chance to respond before the target view. 10176 * 10177 * @param v The view the key has been dispatched to. 10178 * @param keyCode The code for the physical key that was pressed 10179 * @param event The KeyEvent object containing full information about 10180 * the event. 10181 * @return True if the listener has consumed the event, false otherwise. 10182 */ 10183 boolean onKey(View v, int keyCode, KeyEvent event); 10184 } 10185 10186 /** 10187 * Interface definition for a callback to be invoked when a touch event is 10188 * dispatched to this view. The callback will be invoked before the touch 10189 * event is given to the view. 10190 */ 10191 public interface OnTouchListener { 10192 /** 10193 * Called when a touch event is dispatched to a view. This allows listeners to 10194 * get a chance to respond before the target view. 10195 * 10196 * @param v The view the touch event has been dispatched to. 10197 * @param event The MotionEvent object containing full information about 10198 * the event. 10199 * @return True if the listener has consumed the event, false otherwise. 10200 */ 10201 boolean onTouch(View v, MotionEvent event); 10202 } 10203 10204 /** 10205 * Interface definition for a callback to be invoked when a view has been clicked and held. 10206 */ 10207 public interface OnLongClickListener { 10208 /** 10209 * Called when a view has been clicked and held. 10210 * 10211 * @param v The view that was clicked and held. 10212 * 10213 * return True if the callback consumed the long click, false otherwise 10214 */ 10215 boolean onLongClick(View v); 10216 } 10217 10218 /** 10219 * Interface definition for a callback to be invoked when the focus state of 10220 * a view changed. 10221 */ 10222 public interface OnFocusChangeListener { 10223 /** 10224 * Called when the focus state of a view has changed. 10225 * 10226 * @param v The view whose state has changed. 10227 * @param hasFocus The new focus state of v. 10228 */ 10229 void onFocusChange(View v, boolean hasFocus); 10230 } 10231 10232 /** 10233 * Interface definition for a callback to be invoked when a view is clicked. 10234 */ 10235 public interface OnClickListener { 10236 /** 10237 * Called when a view has been clicked. 10238 * 10239 * @param v The view that was clicked. 10240 */ 10241 void onClick(View v); 10242 } 10243 10244 /** 10245 * Interface definition for a callback to be invoked when the context menu 10246 * for this view is being built. 10247 */ 10248 public interface OnCreateContextMenuListener { 10249 /** 10250 * Called when the context menu for this view is being built. It is not 10251 * safe to hold onto the menu after this method returns. 10252 * 10253 * @param menu The context menu that is being built 10254 * @param v The view for which the context menu is being built 10255 * @param menuInfo Extra information about the item for which the 10256 * context menu should be shown. This information will vary 10257 * depending on the class of v. 10258 */ 10259 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 10260 } 10261 10262 private final class UnsetPressedState implements Runnable { 10263 public void run() { 10264 setPressed(false); 10265 } 10266 } 10267 10268 /** 10269 * Base class for derived classes that want to save and restore their own 10270 * state in {@link android.view.View#onSaveInstanceState()}. 10271 */ 10272 public static class BaseSavedState extends AbsSavedState { 10273 /** 10274 * Constructor used when reading from a parcel. Reads the state of the superclass. 10275 * 10276 * @param source 10277 */ 10278 public BaseSavedState(Parcel source) { 10279 super(source); 10280 } 10281 10282 /** 10283 * Constructor called by derived classes when creating their SavedState objects 10284 * 10285 * @param superState The state of the superclass of this view 10286 */ 10287 public BaseSavedState(Parcelable superState) { 10288 super(superState); 10289 } 10290 10291 public static final Parcelable.Creator<BaseSavedState> CREATOR = 10292 new Parcelable.Creator<BaseSavedState>() { 10293 public BaseSavedState createFromParcel(Parcel in) { 10294 return new BaseSavedState(in); 10295 } 10296 10297 public BaseSavedState[] newArray(int size) { 10298 return new BaseSavedState[size]; 10299 } 10300 }; 10301 } 10302 10303 /** 10304 * A set of information given to a view when it is attached to its parent 10305 * window. 10306 */ 10307 static class AttachInfo { 10308 interface Callbacks { 10309 void playSoundEffect(int effectId); 10310 boolean performHapticFeedback(int effectId, boolean always); 10311 } 10312 10313 /** 10314 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 10315 * to a Handler. This class contains the target (View) to invalidate and 10316 * the coordinates of the dirty rectangle. 10317 * 10318 * For performance purposes, this class also implements a pool of up to 10319 * POOL_LIMIT objects that get reused. This reduces memory allocations 10320 * whenever possible. 10321 */ 10322 static class InvalidateInfo implements Poolable<InvalidateInfo> { 10323 private static final int POOL_LIMIT = 10; 10324 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 10325 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 10326 public InvalidateInfo newInstance() { 10327 return new InvalidateInfo(); 10328 } 10329 10330 public void onAcquired(InvalidateInfo element) { 10331 } 10332 10333 public void onReleased(InvalidateInfo element) { 10334 } 10335 }, POOL_LIMIT) 10336 ); 10337 10338 private InvalidateInfo mNext; 10339 10340 View target; 10341 10342 int left; 10343 int top; 10344 int right; 10345 int bottom; 10346 10347 public void setNextPoolable(InvalidateInfo element) { 10348 mNext = element; 10349 } 10350 10351 public InvalidateInfo getNextPoolable() { 10352 return mNext; 10353 } 10354 10355 static InvalidateInfo acquire() { 10356 return sPool.acquire(); 10357 } 10358 10359 void release() { 10360 sPool.release(this); 10361 } 10362 } 10363 10364 final IWindowSession mSession; 10365 10366 final IWindow mWindow; 10367 10368 final IBinder mWindowToken; 10369 10370 final Callbacks mRootCallbacks; 10371 10372 /** 10373 * The top view of the hierarchy. 10374 */ 10375 View mRootView; 10376 10377 IBinder mPanelParentWindowToken; 10378 Surface mSurface; 10379 10380 boolean mHardwareAccelerated; 10381 HardwareRenderer mHardwareRenderer; 10382 10383 /** 10384 * Scale factor used by the compatibility mode 10385 */ 10386 float mApplicationScale; 10387 10388 /** 10389 * Indicates whether the application is in compatibility mode 10390 */ 10391 boolean mScalingRequired; 10392 10393 /** 10394 * Left position of this view's window 10395 */ 10396 int mWindowLeft; 10397 10398 /** 10399 * Top position of this view's window 10400 */ 10401 int mWindowTop; 10402 10403 /** 10404 * Indicates whether the window is translucent/transparent 10405 */ 10406 boolean mTranslucentWindow; 10407 10408 /** 10409 * For windows that are full-screen but using insets to layout inside 10410 * of the screen decorations, these are the current insets for the 10411 * content of the window. 10412 */ 10413 final Rect mContentInsets = new Rect(); 10414 10415 /** 10416 * For windows that are full-screen but using insets to layout inside 10417 * of the screen decorations, these are the current insets for the 10418 * actual visible parts of the window. 10419 */ 10420 final Rect mVisibleInsets = new Rect(); 10421 10422 /** 10423 * The internal insets given by this window. This value is 10424 * supplied by the client (through 10425 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 10426 * be given to the window manager when changed to be used in laying 10427 * out windows behind it. 10428 */ 10429 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 10430 = new ViewTreeObserver.InternalInsetsInfo(); 10431 10432 /** 10433 * All views in the window's hierarchy that serve as scroll containers, 10434 * used to determine if the window can be resized or must be panned 10435 * to adjust for a soft input area. 10436 */ 10437 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 10438 10439 final KeyEvent.DispatcherState mKeyDispatchState 10440 = new KeyEvent.DispatcherState(); 10441 10442 /** 10443 * Indicates whether the view's window currently has the focus. 10444 */ 10445 boolean mHasWindowFocus; 10446 10447 /** 10448 * The current visibility of the window. 10449 */ 10450 int mWindowVisibility; 10451 10452 /** 10453 * Indicates the time at which drawing started to occur. 10454 */ 10455 long mDrawingTime; 10456 10457 /** 10458 * Indicates whether or not ignoring the DIRTY_MASK flags. 10459 */ 10460 boolean mIgnoreDirtyState; 10461 10462 /** 10463 * Indicates whether the view's window is currently in touch mode. 10464 */ 10465 boolean mInTouchMode; 10466 10467 /** 10468 * Indicates that ViewRoot should trigger a global layout change 10469 * the next time it performs a traversal 10470 */ 10471 boolean mRecomputeGlobalAttributes; 10472 10473 /** 10474 * Set during a traveral if any views want to keep the screen on. 10475 */ 10476 boolean mKeepScreenOn; 10477 10478 /** 10479 * Set if the visibility of any views has changed. 10480 */ 10481 boolean mViewVisibilityChanged; 10482 10483 /** 10484 * Set to true if a view has been scrolled. 10485 */ 10486 boolean mViewScrollChanged; 10487 10488 /** 10489 * Global to the view hierarchy used as a temporary for dealing with 10490 * x/y points in the transparent region computations. 10491 */ 10492 final int[] mTransparentLocation = new int[2]; 10493 10494 /** 10495 * Global to the view hierarchy used as a temporary for dealing with 10496 * x/y points in the ViewGroup.invalidateChild implementation. 10497 */ 10498 final int[] mInvalidateChildLocation = new int[2]; 10499 10500 10501 /** 10502 * Global to the view hierarchy used as a temporary for dealing with 10503 * x/y location when view is transformed. 10504 */ 10505 final float[] mTmpTransformLocation = new float[2]; 10506 10507 /** 10508 * The view tree observer used to dispatch global events like 10509 * layout, pre-draw, touch mode change, etc. 10510 */ 10511 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 10512 10513 /** 10514 * A Canvas used by the view hierarchy to perform bitmap caching. 10515 */ 10516 Canvas mCanvas; 10517 10518 /** 10519 * A Handler supplied by a view's {@link android.view.ViewRoot}. This 10520 * handler can be used to pump events in the UI events queue. 10521 */ 10522 final Handler mHandler; 10523 10524 /** 10525 * Identifier for messages requesting the view to be invalidated. 10526 * Such messages should be sent to {@link #mHandler}. 10527 */ 10528 static final int INVALIDATE_MSG = 0x1; 10529 10530 /** 10531 * Identifier for messages requesting the view to invalidate a region. 10532 * Such messages should be sent to {@link #mHandler}. 10533 */ 10534 static final int INVALIDATE_RECT_MSG = 0x2; 10535 10536 /** 10537 * Temporary for use in computing invalidate rectangles while 10538 * calling up the hierarchy. 10539 */ 10540 final Rect mTmpInvalRect = new Rect(); 10541 10542 /** 10543 * Temporary for use in computing hit areas with transformed views 10544 */ 10545 final RectF mTmpTransformRect = new RectF(); 10546 10547 /** 10548 * Temporary list for use in collecting focusable descendents of a view. 10549 */ 10550 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 10551 10552 /** 10553 * Creates a new set of attachment information with the specified 10554 * events handler and thread. 10555 * 10556 * @param handler the events handler the view must use 10557 */ 10558 AttachInfo(IWindowSession session, IWindow window, 10559 Handler handler, Callbacks effectPlayer) { 10560 mSession = session; 10561 mWindow = window; 10562 mWindowToken = window.asBinder(); 10563 mHandler = handler; 10564 mRootCallbacks = effectPlayer; 10565 } 10566 } 10567 10568 /** 10569 * <p>ScrollabilityCache holds various fields used by a View when scrolling 10570 * is supported. This avoids keeping too many unused fields in most 10571 * instances of View.</p> 10572 */ 10573 private static class ScrollabilityCache implements Runnable { 10574 10575 /** 10576 * Scrollbars are not visible 10577 */ 10578 public static final int OFF = 0; 10579 10580 /** 10581 * Scrollbars are visible 10582 */ 10583 public static final int ON = 1; 10584 10585 /** 10586 * Scrollbars are fading away 10587 */ 10588 public static final int FADING = 2; 10589 10590 public boolean fadeScrollBars; 10591 10592 public int fadingEdgeLength; 10593 public int scrollBarDefaultDelayBeforeFade; 10594 public int scrollBarFadeDuration; 10595 10596 public int scrollBarSize; 10597 public ScrollBarDrawable scrollBar; 10598 public float[] interpolatorValues; 10599 public View host; 10600 10601 public final Paint paint; 10602 public final Matrix matrix; 10603 public Shader shader; 10604 10605 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 10606 10607 private final float[] mOpaque = { 255.0f }; 10608 private final float[] mTransparent = { 0.0f }; 10609 10610 /** 10611 * When fading should start. This time moves into the future every time 10612 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 10613 */ 10614 public long fadeStartTime; 10615 10616 10617 /** 10618 * The current state of the scrollbars: ON, OFF, or FADING 10619 */ 10620 public int state = OFF; 10621 10622 private int mLastColor; 10623 10624 public ScrollabilityCache(ViewConfiguration configuration, View host) { 10625 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 10626 scrollBarSize = configuration.getScaledScrollBarSize(); 10627 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 10628 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 10629 10630 paint = new Paint(); 10631 matrix = new Matrix(); 10632 // use use a height of 1, and then wack the matrix each time we 10633 // actually use it. 10634 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 10635 10636 paint.setShader(shader); 10637 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 10638 this.host = host; 10639 } 10640 10641 public void setFadeColor(int color) { 10642 if (color != 0 && color != mLastColor) { 10643 mLastColor = color; 10644 color |= 0xFF000000; 10645 10646 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 10647 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 10648 10649 paint.setShader(shader); 10650 // Restore the default transfer mode (src_over) 10651 paint.setXfermode(null); 10652 } 10653 } 10654 10655 public void run() { 10656 long now = AnimationUtils.currentAnimationTimeMillis(); 10657 if (now >= fadeStartTime) { 10658 10659 // the animation fades the scrollbars out by changing 10660 // the opacity (alpha) from fully opaque to fully 10661 // transparent 10662 int nextFrame = (int) now; 10663 int framesCount = 0; 10664 10665 Interpolator interpolator = scrollBarInterpolator; 10666 10667 // Start opaque 10668 interpolator.setKeyFrame(framesCount++, nextFrame, mOpaque); 10669 10670 // End transparent 10671 nextFrame += scrollBarFadeDuration; 10672 interpolator.setKeyFrame(framesCount, nextFrame, mTransparent); 10673 10674 state = FADING; 10675 10676 // Kick off the fade animation 10677 host.invalidate(); 10678 } 10679 } 10680 10681 } 10682} 10683