View.java revision 6c319ca1275c8db892c39b48fc54864c949f9171
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import com.android.internal.R; 20import com.android.internal.util.Predicate; 21import com.android.internal.view.menu.MenuBuilder; 22 23import android.content.ClipData; 24import android.content.Context; 25import android.content.res.Configuration; 26import android.content.res.Resources; 27import android.content.res.TypedArray; 28import android.graphics.Bitmap; 29import android.graphics.Camera; 30import android.graphics.Canvas; 31import android.graphics.Interpolator; 32import android.graphics.LinearGradient; 33import android.graphics.Matrix; 34import android.graphics.Paint; 35import android.graphics.PixelFormat; 36import android.graphics.Point; 37import android.graphics.PorterDuff; 38import android.graphics.PorterDuffXfermode; 39import android.graphics.Rect; 40import android.graphics.RectF; 41import android.graphics.Region; 42import android.graphics.Shader; 43import android.graphics.drawable.ColorDrawable; 44import android.graphics.drawable.Drawable; 45import android.os.Handler; 46import android.os.IBinder; 47import android.os.Message; 48import android.os.Parcel; 49import android.os.Parcelable; 50import android.os.RemoteException; 51import android.os.SystemClock; 52import android.os.SystemProperties; 53import android.util.AttributeSet; 54import android.util.Log; 55import android.util.Pool; 56import android.util.Poolable; 57import android.util.PoolableManager; 58import android.util.Pools; 59import android.util.SparseArray; 60import android.view.ContextMenu.ContextMenuInfo; 61import android.view.accessibility.AccessibilityEvent; 62import android.view.accessibility.AccessibilityEventSource; 63import android.view.accessibility.AccessibilityManager; 64import android.view.animation.Animation; 65import android.view.animation.AnimationUtils; 66import android.view.inputmethod.EditorInfo; 67import android.view.inputmethod.InputConnection; 68import android.view.inputmethod.InputMethodManager; 69import android.widget.ScrollBarDrawable; 70 71import java.lang.ref.WeakReference; 72import java.lang.reflect.InvocationTargetException; 73import java.lang.reflect.Method; 74import java.util.ArrayList; 75import java.util.Arrays; 76import java.util.List; 77import java.util.WeakHashMap; 78 79/** 80 * <p> 81 * This class represents the basic building block for user interface components. A View 82 * occupies a rectangular area on the screen and is responsible for drawing and 83 * event handling. View is the base class for <em>widgets</em>, which are 84 * used to create interactive UI components (buttons, text fields, etc.). The 85 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 86 * are invisible containers that hold other Views (or other ViewGroups) and define 87 * their layout properties. 88 * </p> 89 * 90 * <div class="special"> 91 * <p>For an introduction to using this class to develop your 92 * application's user interface, read the Developer Guide documentation on 93 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 94 * include: 95 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 96 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 97 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 98 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 99 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 100 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 103 * </p> 104 * </div> 105 * 106 * <a name="Using"></a> 107 * <h3>Using Views</h3> 108 * <p> 109 * All of the views in a window are arranged in a single tree. You can add views 110 * either from code or by specifying a tree of views in one or more XML layout 111 * files. There are many specialized subclasses of views that act as controls or 112 * are capable of displaying text, images, or other content. 113 * </p> 114 * <p> 115 * Once you have created a tree of views, there are typically a few types of 116 * common operations you may wish to perform: 117 * <ul> 118 * <li><strong>Set properties:</strong> for example setting the text of a 119 * {@link android.widget.TextView}. The available properties and the methods 120 * that set them will vary among the different subclasses of views. Note that 121 * properties that are known at build time can be set in the XML layout 122 * files.</li> 123 * <li><strong>Set focus:</strong> The framework will handled moving focus in 124 * response to user input. To force focus to a specific view, call 125 * {@link #requestFocus}.</li> 126 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 127 * that will be notified when something interesting happens to the view. For 128 * example, all views will let you set a listener to be notified when the view 129 * gains or loses focus. You can register such a listener using 130 * {@link #setOnFocusChangeListener}. Other view subclasses offer more 131 * specialized listeners. For example, a Button exposes a listener to notify 132 * clients when the button is clicked.</li> 133 * <li><strong>Set visibility:</strong> You can hide or show views using 134 * {@link #setVisibility}.</li> 135 * </ul> 136 * </p> 137 * <p><em> 138 * Note: The Android framework is responsible for measuring, laying out and 139 * drawing views. You should not call methods that perform these actions on 140 * views yourself unless you are actually implementing a 141 * {@link android.view.ViewGroup}. 142 * </em></p> 143 * 144 * <a name="Lifecycle"></a> 145 * <h3>Implementing a Custom View</h3> 146 * 147 * <p> 148 * To implement a custom view, you will usually begin by providing overrides for 149 * some of the standard methods that the framework calls on all views. You do 150 * not need to override all of these methods. In fact, you can start by just 151 * overriding {@link #onDraw(android.graphics.Canvas)}. 152 * <table border="2" width="85%" align="center" cellpadding="5"> 153 * <thead> 154 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 155 * </thead> 156 * 157 * <tbody> 158 * <tr> 159 * <td rowspan="2">Creation</td> 160 * <td>Constructors</td> 161 * <td>There is a form of the constructor that are called when the view 162 * is created from code and a form that is called when the view is 163 * inflated from a layout file. The second form should parse and apply 164 * any attributes defined in the layout file. 165 * </td> 166 * </tr> 167 * <tr> 168 * <td><code>{@link #onFinishInflate()}</code></td> 169 * <td>Called after a view and all of its children has been inflated 170 * from XML.</td> 171 * </tr> 172 * 173 * <tr> 174 * <td rowspan="3">Layout</td> 175 * <td><code>{@link #onMeasure}</code></td> 176 * <td>Called to determine the size requirements for this view and all 177 * of its children. 178 * </td> 179 * </tr> 180 * <tr> 181 * <td><code>{@link #onLayout}</code></td> 182 * <td>Called when this view should assign a size and position to all 183 * of its children. 184 * </td> 185 * </tr> 186 * <tr> 187 * <td><code>{@link #onSizeChanged}</code></td> 188 * <td>Called when the size of this view has changed. 189 * </td> 190 * </tr> 191 * 192 * <tr> 193 * <td>Drawing</td> 194 * <td><code>{@link #onDraw}</code></td> 195 * <td>Called when the view should render its content. 196 * </td> 197 * </tr> 198 * 199 * <tr> 200 * <td rowspan="4">Event processing</td> 201 * <td><code>{@link #onKeyDown}</code></td> 202 * <td>Called when a new key event occurs. 203 * </td> 204 * </tr> 205 * <tr> 206 * <td><code>{@link #onKeyUp}</code></td> 207 * <td>Called when a key up event occurs. 208 * </td> 209 * </tr> 210 * <tr> 211 * <td><code>{@link #onTrackballEvent}</code></td> 212 * <td>Called when a trackball motion event occurs. 213 * </td> 214 * </tr> 215 * <tr> 216 * <td><code>{@link #onTouchEvent}</code></td> 217 * <td>Called when a touch screen motion event occurs. 218 * </td> 219 * </tr> 220 * 221 * <tr> 222 * <td rowspan="2">Focus</td> 223 * <td><code>{@link #onFocusChanged}</code></td> 224 * <td>Called when the view gains or loses focus. 225 * </td> 226 * </tr> 227 * 228 * <tr> 229 * <td><code>{@link #onWindowFocusChanged}</code></td> 230 * <td>Called when the window containing the view gains or loses focus. 231 * </td> 232 * </tr> 233 * 234 * <tr> 235 * <td rowspan="3">Attaching</td> 236 * <td><code>{@link #onAttachedToWindow()}</code></td> 237 * <td>Called when the view is attached to a window. 238 * </td> 239 * </tr> 240 * 241 * <tr> 242 * <td><code>{@link #onDetachedFromWindow}</code></td> 243 * <td>Called when the view is detached from its window. 244 * </td> 245 * </tr> 246 * 247 * <tr> 248 * <td><code>{@link #onWindowVisibilityChanged}</code></td> 249 * <td>Called when the visibility of the window containing the view 250 * has changed. 251 * </td> 252 * </tr> 253 * </tbody> 254 * 255 * </table> 256 * </p> 257 * 258 * <a name="IDs"></a> 259 * <h3>IDs</h3> 260 * Views may have an integer id associated with them. These ids are typically 261 * assigned in the layout XML files, and are used to find specific views within 262 * the view tree. A common pattern is to: 263 * <ul> 264 * <li>Define a Button in the layout file and assign it a unique ID. 265 * <pre> 266 * <Button 267 * android:id="@+id/my_button" 268 * android:layout_width="wrap_content" 269 * android:layout_height="wrap_content" 270 * android:text="@string/my_button_text"/> 271 * </pre></li> 272 * <li>From the onCreate method of an Activity, find the Button 273 * <pre class="prettyprint"> 274 * Button myButton = (Button) findViewById(R.id.my_button); 275 * </pre></li> 276 * </ul> 277 * <p> 278 * View IDs need not be unique throughout the tree, but it is good practice to 279 * ensure that they are at least unique within the part of the tree you are 280 * searching. 281 * </p> 282 * 283 * <a name="Position"></a> 284 * <h3>Position</h3> 285 * <p> 286 * The geometry of a view is that of a rectangle. A view has a location, 287 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 288 * two dimensions, expressed as a width and a height. The unit for location 289 * and dimensions is the pixel. 290 * </p> 291 * 292 * <p> 293 * It is possible to retrieve the location of a view by invoking the methods 294 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 295 * coordinate of the rectangle representing the view. The latter returns the 296 * top, or Y, coordinate of the rectangle representing the view. These methods 297 * both return the location of the view relative to its parent. For instance, 298 * when getLeft() returns 20, that means the view is located 20 pixels to the 299 * right of the left edge of its direct parent. 300 * </p> 301 * 302 * <p> 303 * In addition, several convenience methods are offered to avoid unnecessary 304 * computations, namely {@link #getRight()} and {@link #getBottom()}. 305 * These methods return the coordinates of the right and bottom edges of the 306 * rectangle representing the view. For instance, calling {@link #getRight()} 307 * is similar to the following computation: <code>getLeft() + getWidth()</code> 308 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 309 * </p> 310 * 311 * <a name="SizePaddingMargins"></a> 312 * <h3>Size, padding and margins</h3> 313 * <p> 314 * The size of a view is expressed with a width and a height. A view actually 315 * possess two pairs of width and height values. 316 * </p> 317 * 318 * <p> 319 * The first pair is known as <em>measured width</em> and 320 * <em>measured height</em>. These dimensions define how big a view wants to be 321 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 322 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 323 * and {@link #getMeasuredHeight()}. 324 * </p> 325 * 326 * <p> 327 * The second pair is simply known as <em>width</em> and <em>height</em>, or 328 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 329 * dimensions define the actual size of the view on screen, at drawing time and 330 * after layout. These values may, but do not have to, be different from the 331 * measured width and height. The width and height can be obtained by calling 332 * {@link #getWidth()} and {@link #getHeight()}. 333 * </p> 334 * 335 * <p> 336 * To measure its dimensions, a view takes into account its padding. The padding 337 * is expressed in pixels for the left, top, right and bottom parts of the view. 338 * Padding can be used to offset the content of the view by a specific amount of 339 * pixels. For instance, a left padding of 2 will push the view's content by 340 * 2 pixels to the right of the left edge. Padding can be set using the 341 * {@link #setPadding(int, int, int, int)} method and queried by calling 342 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 343 * {@link #getPaddingRight()} and {@link #getPaddingBottom()}. 344 * </p> 345 * 346 * <p> 347 * Even though a view can define a padding, it does not provide any support for 348 * margins. However, view groups provide such a support. Refer to 349 * {@link android.view.ViewGroup} and 350 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 351 * </p> 352 * 353 * <a name="Layout"></a> 354 * <h3>Layout</h3> 355 * <p> 356 * Layout is a two pass process: a measure pass and a layout pass. The measuring 357 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 358 * of the view tree. Each view pushes dimension specifications down the tree 359 * during the recursion. At the end of the measure pass, every view has stored 360 * its measurements. The second pass happens in 361 * {@link #layout(int,int,int,int)} and is also top-down. During 362 * this pass each parent is responsible for positioning all of its children 363 * using the sizes computed in the measure pass. 364 * </p> 365 * 366 * <p> 367 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 368 * {@link #getMeasuredHeight()} values must be set, along with those for all of 369 * that view's descendants. A view's measured width and measured height values 370 * must respect the constraints imposed by the view's parents. This guarantees 371 * that at the end of the measure pass, all parents accept all of their 372 * children's measurements. A parent view may call measure() more than once on 373 * its children. For example, the parent may measure each child once with 374 * unspecified dimensions to find out how big they want to be, then call 375 * measure() on them again with actual numbers if the sum of all the children's 376 * unconstrained sizes is too big or too small. 377 * </p> 378 * 379 * <p> 380 * The measure pass uses two classes to communicate dimensions. The 381 * {@link MeasureSpec} class is used by views to tell their parents how they 382 * want to be measured and positioned. The base LayoutParams class just 383 * describes how big the view wants to be for both width and height. For each 384 * dimension, it can specify one of: 385 * <ul> 386 * <li> an exact number 387 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 388 * (minus padding) 389 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 390 * enclose its content (plus padding). 391 * </ul> 392 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 393 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 394 * an X and Y value. 395 * </p> 396 * 397 * <p> 398 * MeasureSpecs are used to push requirements down the tree from parent to 399 * child. A MeasureSpec can be in one of three modes: 400 * <ul> 401 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 402 * of a child view. For example, a LinearLayout may call measure() on its child 403 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 404 * tall the child view wants to be given a width of 240 pixels. 405 * <li>EXACTLY: This is used by the parent to impose an exact size on the 406 * child. The child must use this size, and guarantee that all of its 407 * descendants will fit within this size. 408 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 409 * child. The child must gurantee that it and all of its descendants will fit 410 * within this size. 411 * </ul> 412 * </p> 413 * 414 * <p> 415 * To intiate a layout, call {@link #requestLayout}. This method is typically 416 * called by a view on itself when it believes that is can no longer fit within 417 * its current bounds. 418 * </p> 419 * 420 * <a name="Drawing"></a> 421 * <h3>Drawing</h3> 422 * <p> 423 * Drawing is handled by walking the tree and rendering each view that 424 * intersects the the invalid region. Because the tree is traversed in-order, 425 * this means that parents will draw before (i.e., behind) their children, with 426 * siblings drawn in the order they appear in the tree. 427 * If you set a background drawable for a View, then the View will draw it for you 428 * before calling back to its <code>onDraw()</code> method. 429 * </p> 430 * 431 * <p> 432 * Note that the framework will not draw views that are not in the invalid region. 433 * </p> 434 * 435 * <p> 436 * To force a view to draw, call {@link #invalidate()}. 437 * </p> 438 * 439 * <a name="EventHandlingThreading"></a> 440 * <h3>Event Handling and Threading</h3> 441 * <p> 442 * The basic cycle of a view is as follows: 443 * <ol> 444 * <li>An event comes in and is dispatched to the appropriate view. The view 445 * handles the event and notifies any listeners.</li> 446 * <li>If in the course of processing the event, the view's bounds may need 447 * to be changed, the view will call {@link #requestLayout()}.</li> 448 * <li>Similarly, if in the course of processing the event the view's appearance 449 * may need to be changed, the view will call {@link #invalidate()}.</li> 450 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 451 * the framework will take care of measuring, laying out, and drawing the tree 452 * as appropriate.</li> 453 * </ol> 454 * </p> 455 * 456 * <p><em>Note: The entire view tree is single threaded. You must always be on 457 * the UI thread when calling any method on any view.</em> 458 * If you are doing work on other threads and want to update the state of a view 459 * from that thread, you should use a {@link Handler}. 460 * </p> 461 * 462 * <a name="FocusHandling"></a> 463 * <h3>Focus Handling</h3> 464 * <p> 465 * The framework will handle routine focus movement in response to user input. 466 * This includes changing the focus as views are removed or hidden, or as new 467 * views become available. Views indicate their willingness to take focus 468 * through the {@link #isFocusable} method. To change whether a view can take 469 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 470 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 471 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 472 * </p> 473 * <p> 474 * Focus movement is based on an algorithm which finds the nearest neighbor in a 475 * given direction. In rare cases, the default algorithm may not match the 476 * intended behavior of the developer. In these situations, you can provide 477 * explicit overrides by using these XML attributes in the layout file: 478 * <pre> 479 * nextFocusDown 480 * nextFocusLeft 481 * nextFocusRight 482 * nextFocusUp 483 * </pre> 484 * </p> 485 * 486 * 487 * <p> 488 * To get a particular view to take focus, call {@link #requestFocus()}. 489 * </p> 490 * 491 * <a name="TouchMode"></a> 492 * <h3>Touch Mode</h3> 493 * <p> 494 * When a user is navigating a user interface via directional keys such as a D-pad, it is 495 * necessary to give focus to actionable items such as buttons so the user can see 496 * what will take input. If the device has touch capabilities, however, and the user 497 * begins interacting with the interface by touching it, it is no longer necessary to 498 * always highlight, or give focus to, a particular view. This motivates a mode 499 * for interaction named 'touch mode'. 500 * </p> 501 * <p> 502 * For a touch capable device, once the user touches the screen, the device 503 * will enter touch mode. From this point onward, only views for which 504 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 505 * Other views that are touchable, like buttons, will not take focus when touched; they will 506 * only fire the on click listeners. 507 * </p> 508 * <p> 509 * Any time a user hits a directional key, such as a D-pad direction, the view device will 510 * exit touch mode, and find a view to take focus, so that the user may resume interacting 511 * with the user interface without touching the screen again. 512 * </p> 513 * <p> 514 * The touch mode state is maintained across {@link android.app.Activity}s. Call 515 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 516 * </p> 517 * 518 * <a name="Scrolling"></a> 519 * <h3>Scrolling</h3> 520 * <p> 521 * The framework provides basic support for views that wish to internally 522 * scroll their content. This includes keeping track of the X and Y scroll 523 * offset as well as mechanisms for drawing scrollbars. See 524 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 525 * {@link #awakenScrollBars()} for more details. 526 * </p> 527 * 528 * <a name="Tags"></a> 529 * <h3>Tags</h3> 530 * <p> 531 * Unlike IDs, tags are not used to identify views. Tags are essentially an 532 * extra piece of information that can be associated with a view. They are most 533 * often used as a convenience to store data related to views in the views 534 * themselves rather than by putting them in a separate structure. 535 * </p> 536 * 537 * <a name="Animation"></a> 538 * <h3>Animation</h3> 539 * <p> 540 * You can attach an {@link Animation} object to a view using 541 * {@link #setAnimation(Animation)} or 542 * {@link #startAnimation(Animation)}. The animation can alter the scale, 543 * rotation, translation and alpha of a view over time. If the animation is 544 * attached to a view that has children, the animation will affect the entire 545 * subtree rooted by that node. When an animation is started, the framework will 546 * take care of redrawing the appropriate views until the animation completes. 547 * </p> 548 * <p> 549 * Starting with Android 3.0, the preferred way of animating views is to use the 550 * {@link android.animation} package APIs. 551 * </p> 552 * 553 * <a name="Security"></a> 554 * <h3>Security</h3> 555 * <p> 556 * Sometimes it is essential that an application be able to verify that an action 557 * is being performed with the full knowledge and consent of the user, such as 558 * granting a permission request, making a purchase or clicking on an advertisement. 559 * Unfortunately, a malicious application could try to spoof the user into 560 * performing these actions, unaware, by concealing the intended purpose of the view. 561 * As a remedy, the framework offers a touch filtering mechanism that can be used to 562 * improve the security of views that provide access to sensitive functionality. 563 * </p><p> 564 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured} or set the 565 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 566 * will discard touches that are received whenever the view's window is obscured by 567 * another visible window. As a result, the view will not receive touches whenever a 568 * toast, dialog or other window appears above the view's window. 569 * </p><p> 570 * For more fine-grained control over security, consider overriding the 571 * {@link #onFilterTouchEventForSecurity} method to implement your own security policy. 572 * See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 573 * </p> 574 * 575 * @attr ref android.R.styleable#View_alpha 576 * @attr ref android.R.styleable#View_background 577 * @attr ref android.R.styleable#View_clickable 578 * @attr ref android.R.styleable#View_contentDescription 579 * @attr ref android.R.styleable#View_drawingCacheQuality 580 * @attr ref android.R.styleable#View_duplicateParentState 581 * @attr ref android.R.styleable#View_id 582 * @attr ref android.R.styleable#View_fadingEdge 583 * @attr ref android.R.styleable#View_fadingEdgeLength 584 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 585 * @attr ref android.R.styleable#View_fitsSystemWindows 586 * @attr ref android.R.styleable#View_isScrollContainer 587 * @attr ref android.R.styleable#View_focusable 588 * @attr ref android.R.styleable#View_focusableInTouchMode 589 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 590 * @attr ref android.R.styleable#View_keepScreenOn 591 * @attr ref android.R.styleable#View_layerType 592 * @attr ref android.R.styleable#View_longClickable 593 * @attr ref android.R.styleable#View_minHeight 594 * @attr ref android.R.styleable#View_minWidth 595 * @attr ref android.R.styleable#View_nextFocusDown 596 * @attr ref android.R.styleable#View_nextFocusLeft 597 * @attr ref android.R.styleable#View_nextFocusRight 598 * @attr ref android.R.styleable#View_nextFocusUp 599 * @attr ref android.R.styleable#View_onClick 600 * @attr ref android.R.styleable#View_padding 601 * @attr ref android.R.styleable#View_paddingBottom 602 * @attr ref android.R.styleable#View_paddingLeft 603 * @attr ref android.R.styleable#View_paddingRight 604 * @attr ref android.R.styleable#View_paddingTop 605 * @attr ref android.R.styleable#View_saveEnabled 606 * @attr ref android.R.styleable#View_rotation 607 * @attr ref android.R.styleable#View_rotationX 608 * @attr ref android.R.styleable#View_rotationY 609 * @attr ref android.R.styleable#View_scaleX 610 * @attr ref android.R.styleable#View_scaleY 611 * @attr ref android.R.styleable#View_scrollX 612 * @attr ref android.R.styleable#View_scrollY 613 * @attr ref android.R.styleable#View_scrollbarSize 614 * @attr ref android.R.styleable#View_scrollbarStyle 615 * @attr ref android.R.styleable#View_scrollbars 616 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 617 * @attr ref android.R.styleable#View_scrollbarFadeDuration 618 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 619 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 620 * @attr ref android.R.styleable#View_scrollbarThumbVertical 621 * @attr ref android.R.styleable#View_scrollbarTrackVertical 622 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 623 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 624 * @attr ref android.R.styleable#View_soundEffectsEnabled 625 * @attr ref android.R.styleable#View_tag 626 * @attr ref android.R.styleable#View_transformPivotX 627 * @attr ref android.R.styleable#View_transformPivotY 628 * @attr ref android.R.styleable#View_translationX 629 * @attr ref android.R.styleable#View_translationY 630 * @attr ref android.R.styleable#View_visibility 631 * 632 * @see android.view.ViewGroup 633 */ 634public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource { 635 private static final boolean DBG = false; 636 637 /** 638 * The logging tag used by this class with android.util.Log. 639 */ 640 protected static final String VIEW_LOG_TAG = "View"; 641 642 /** 643 * Used to mark a View that has no ID. 644 */ 645 public static final int NO_ID = -1; 646 647 /** 648 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 649 * calling setFlags. 650 */ 651 private static final int NOT_FOCUSABLE = 0x00000000; 652 653 /** 654 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 655 * setFlags. 656 */ 657 private static final int FOCUSABLE = 0x00000001; 658 659 /** 660 * Mask for use with setFlags indicating bits used for focus. 661 */ 662 private static final int FOCUSABLE_MASK = 0x00000001; 663 664 /** 665 * This view will adjust its padding to fit sytem windows (e.g. status bar) 666 */ 667 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 668 669 /** 670 * This view is visible. Use with {@link #setVisibility}. 671 */ 672 public static final int VISIBLE = 0x00000000; 673 674 /** 675 * This view is invisible, but it still takes up space for layout purposes. 676 * Use with {@link #setVisibility}. 677 */ 678 public static final int INVISIBLE = 0x00000004; 679 680 /** 681 * This view is invisible, and it doesn't take any space for layout 682 * purposes. Use with {@link #setVisibility}. 683 */ 684 public static final int GONE = 0x00000008; 685 686 /** 687 * Mask for use with setFlags indicating bits used for visibility. 688 * {@hide} 689 */ 690 static final int VISIBILITY_MASK = 0x0000000C; 691 692 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 693 694 /** 695 * This view is enabled. Intrepretation varies by subclass. 696 * Use with ENABLED_MASK when calling setFlags. 697 * {@hide} 698 */ 699 static final int ENABLED = 0x00000000; 700 701 /** 702 * This view is disabled. Intrepretation varies by subclass. 703 * Use with ENABLED_MASK when calling setFlags. 704 * {@hide} 705 */ 706 static final int DISABLED = 0x00000020; 707 708 /** 709 * Mask for use with setFlags indicating bits used for indicating whether 710 * this view is enabled 711 * {@hide} 712 */ 713 static final int ENABLED_MASK = 0x00000020; 714 715 /** 716 * This view won't draw. {@link #onDraw} won't be called and further 717 * optimizations 718 * will be performed. It is okay to have this flag set and a background. 719 * Use with DRAW_MASK when calling setFlags. 720 * {@hide} 721 */ 722 static final int WILL_NOT_DRAW = 0x00000080; 723 724 /** 725 * Mask for use with setFlags indicating bits used for indicating whether 726 * this view is will draw 727 * {@hide} 728 */ 729 static final int DRAW_MASK = 0x00000080; 730 731 /** 732 * <p>This view doesn't show scrollbars.</p> 733 * {@hide} 734 */ 735 static final int SCROLLBARS_NONE = 0x00000000; 736 737 /** 738 * <p>This view shows horizontal scrollbars.</p> 739 * {@hide} 740 */ 741 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 742 743 /** 744 * <p>This view shows vertical scrollbars.</p> 745 * {@hide} 746 */ 747 static final int SCROLLBARS_VERTICAL = 0x00000200; 748 749 /** 750 * <p>Mask for use with setFlags indicating bits used for indicating which 751 * scrollbars are enabled.</p> 752 * {@hide} 753 */ 754 static final int SCROLLBARS_MASK = 0x00000300; 755 756 /** 757 * Indicates that the view should filter touches when its window is obscured. 758 * Refer to the class comments for more information about this security feature. 759 * {@hide} 760 */ 761 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 762 763 // note flag value 0x00000800 is now available for next flags... 764 765 /** 766 * <p>This view doesn't show fading edges.</p> 767 * {@hide} 768 */ 769 static final int FADING_EDGE_NONE = 0x00000000; 770 771 /** 772 * <p>This view shows horizontal fading edges.</p> 773 * {@hide} 774 */ 775 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 776 777 /** 778 * <p>This view shows vertical fading edges.</p> 779 * {@hide} 780 */ 781 static final int FADING_EDGE_VERTICAL = 0x00002000; 782 783 /** 784 * <p>Mask for use with setFlags indicating bits used for indicating which 785 * fading edges are enabled.</p> 786 * {@hide} 787 */ 788 static final int FADING_EDGE_MASK = 0x00003000; 789 790 /** 791 * <p>Indicates this view can be clicked. When clickable, a View reacts 792 * to clicks by notifying the OnClickListener.<p> 793 * {@hide} 794 */ 795 static final int CLICKABLE = 0x00004000; 796 797 /** 798 * <p>Indicates this view is caching its drawing into a bitmap.</p> 799 * {@hide} 800 */ 801 static final int DRAWING_CACHE_ENABLED = 0x00008000; 802 803 /** 804 * <p>Indicates that no icicle should be saved for this view.<p> 805 * {@hide} 806 */ 807 static final int SAVE_DISABLED = 0x000010000; 808 809 /** 810 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 811 * property.</p> 812 * {@hide} 813 */ 814 static final int SAVE_DISABLED_MASK = 0x000010000; 815 816 /** 817 * <p>Indicates that no drawing cache should ever be created for this view.<p> 818 * {@hide} 819 */ 820 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 821 822 /** 823 * <p>Indicates this view can take / keep focus when int touch mode.</p> 824 * {@hide} 825 */ 826 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 827 828 /** 829 * <p>Enables low quality mode for the drawing cache.</p> 830 */ 831 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 832 833 /** 834 * <p>Enables high quality mode for the drawing cache.</p> 835 */ 836 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 837 838 /** 839 * <p>Enables automatic quality mode for the drawing cache.</p> 840 */ 841 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 842 843 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 844 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 845 }; 846 847 /** 848 * <p>Mask for use with setFlags indicating bits used for the cache 849 * quality property.</p> 850 * {@hide} 851 */ 852 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 853 854 /** 855 * <p> 856 * Indicates this view can be long clicked. When long clickable, a View 857 * reacts to long clicks by notifying the OnLongClickListener or showing a 858 * context menu. 859 * </p> 860 * {@hide} 861 */ 862 static final int LONG_CLICKABLE = 0x00200000; 863 864 /** 865 * <p>Indicates that this view gets its drawable states from its direct parent 866 * and ignores its original internal states.</p> 867 * 868 * @hide 869 */ 870 static final int DUPLICATE_PARENT_STATE = 0x00400000; 871 872 /** 873 * The scrollbar style to display the scrollbars inside the content area, 874 * without increasing the padding. The scrollbars will be overlaid with 875 * translucency on the view's content. 876 */ 877 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 878 879 /** 880 * The scrollbar style to display the scrollbars inside the padded area, 881 * increasing the padding of the view. The scrollbars will not overlap the 882 * content area of the view. 883 */ 884 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 885 886 /** 887 * The scrollbar style to display the scrollbars at the edge of the view, 888 * without increasing the padding. The scrollbars will be overlaid with 889 * translucency. 890 */ 891 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 892 893 /** 894 * The scrollbar style to display the scrollbars at the edge of the view, 895 * increasing the padding of the view. The scrollbars will only overlap the 896 * background, if any. 897 */ 898 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 899 900 /** 901 * Mask to check if the scrollbar style is overlay or inset. 902 * {@hide} 903 */ 904 static final int SCROLLBARS_INSET_MASK = 0x01000000; 905 906 /** 907 * Mask to check if the scrollbar style is inside or outside. 908 * {@hide} 909 */ 910 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 911 912 /** 913 * Mask for scrollbar style. 914 * {@hide} 915 */ 916 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 917 918 /** 919 * View flag indicating that the screen should remain on while the 920 * window containing this view is visible to the user. This effectively 921 * takes care of automatically setting the WindowManager's 922 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 923 */ 924 public static final int KEEP_SCREEN_ON = 0x04000000; 925 926 /** 927 * View flag indicating whether this view should have sound effects enabled 928 * for events such as clicking and touching. 929 */ 930 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 931 932 /** 933 * View flag indicating whether this view should have haptic feedback 934 * enabled for events such as long presses. 935 */ 936 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 937 938 /** 939 * <p>Indicates that the view hierarchy should stop saving state when 940 * it reaches this view. If state saving is initiated immediately at 941 * the view, it will be allowed. 942 * {@hide} 943 */ 944 static final int PARENT_SAVE_DISABLED = 0x20000000; 945 946 /** 947 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 948 * {@hide} 949 */ 950 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 951 952 /** 953 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 954 * should add all focusable Views regardless if they are focusable in touch mode. 955 */ 956 public static final int FOCUSABLES_ALL = 0x00000000; 957 958 /** 959 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 960 * should add only Views focusable in touch mode. 961 */ 962 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 963 964 /** 965 * Use with {@link #focusSearch}. Move focus to the previous selectable 966 * item. 967 */ 968 public static final int FOCUS_BACKWARD = 0x00000001; 969 970 /** 971 * Use with {@link #focusSearch}. Move focus to the next selectable 972 * item. 973 */ 974 public static final int FOCUS_FORWARD = 0x00000002; 975 976 /** 977 * Use with {@link #focusSearch}. Move focus to the left. 978 */ 979 public static final int FOCUS_LEFT = 0x00000011; 980 981 /** 982 * Use with {@link #focusSearch}. Move focus up. 983 */ 984 public static final int FOCUS_UP = 0x00000021; 985 986 /** 987 * Use with {@link #focusSearch}. Move focus to the right. 988 */ 989 public static final int FOCUS_RIGHT = 0x00000042; 990 991 /** 992 * Use with {@link #focusSearch}. Move focus down. 993 */ 994 public static final int FOCUS_DOWN = 0x00000082; 995 996 /** 997 * Bits of {@link #getMeasuredWidthAndState()} and 998 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 999 */ 1000 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1001 1002 /** 1003 * Bits of {@link #getMeasuredWidthAndState()} and 1004 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1005 */ 1006 public static final int MEASURED_STATE_MASK = 0xff000000; 1007 1008 /** 1009 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1010 * for functions that combine both width and height into a single int, 1011 * such as {@link #getMeasuredState()} and the childState argument of 1012 * {@link #resolveSizeAndState(int, int, int)}. 1013 */ 1014 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1015 1016 /** 1017 * Bit of {@link #getMeasuredWidthAndState()} and 1018 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1019 * is smaller that the space the view would like to have. 1020 */ 1021 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1022 1023 /** 1024 * Base View state sets 1025 */ 1026 // Singles 1027 /** 1028 * Indicates the view has no states set. States are used with 1029 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1030 * view depending on its state. 1031 * 1032 * @see android.graphics.drawable.Drawable 1033 * @see #getDrawableState() 1034 */ 1035 protected static final int[] EMPTY_STATE_SET; 1036 /** 1037 * Indicates the view is enabled. States are used with 1038 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1039 * view depending on its state. 1040 * 1041 * @see android.graphics.drawable.Drawable 1042 * @see #getDrawableState() 1043 */ 1044 protected static final int[] ENABLED_STATE_SET; 1045 /** 1046 * Indicates the view is focused. States are used with 1047 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1048 * view depending on its state. 1049 * 1050 * @see android.graphics.drawable.Drawable 1051 * @see #getDrawableState() 1052 */ 1053 protected static final int[] FOCUSED_STATE_SET; 1054 /** 1055 * Indicates the view is selected. States are used with 1056 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1057 * view depending on its state. 1058 * 1059 * @see android.graphics.drawable.Drawable 1060 * @see #getDrawableState() 1061 */ 1062 protected static final int[] SELECTED_STATE_SET; 1063 /** 1064 * Indicates the view is pressed. States are used with 1065 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1066 * view depending on its state. 1067 * 1068 * @see android.graphics.drawable.Drawable 1069 * @see #getDrawableState() 1070 * @hide 1071 */ 1072 protected static final int[] PRESSED_STATE_SET; 1073 /** 1074 * Indicates the view's window has focus. States are used with 1075 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1076 * view depending on its state. 1077 * 1078 * @see android.graphics.drawable.Drawable 1079 * @see #getDrawableState() 1080 */ 1081 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1082 // Doubles 1083 /** 1084 * Indicates the view is enabled and has the focus. 1085 * 1086 * @see #ENABLED_STATE_SET 1087 * @see #FOCUSED_STATE_SET 1088 */ 1089 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1090 /** 1091 * Indicates the view is enabled and selected. 1092 * 1093 * @see #ENABLED_STATE_SET 1094 * @see #SELECTED_STATE_SET 1095 */ 1096 protected static final int[] ENABLED_SELECTED_STATE_SET; 1097 /** 1098 * Indicates the view is enabled and that its window has focus. 1099 * 1100 * @see #ENABLED_STATE_SET 1101 * @see #WINDOW_FOCUSED_STATE_SET 1102 */ 1103 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1104 /** 1105 * Indicates the view is focused and selected. 1106 * 1107 * @see #FOCUSED_STATE_SET 1108 * @see #SELECTED_STATE_SET 1109 */ 1110 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1111 /** 1112 * Indicates the view has the focus and that its window has the focus. 1113 * 1114 * @see #FOCUSED_STATE_SET 1115 * @see #WINDOW_FOCUSED_STATE_SET 1116 */ 1117 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1118 /** 1119 * Indicates the view is selected and that its window has the focus. 1120 * 1121 * @see #SELECTED_STATE_SET 1122 * @see #WINDOW_FOCUSED_STATE_SET 1123 */ 1124 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1125 // Triples 1126 /** 1127 * Indicates the view is enabled, focused and selected. 1128 * 1129 * @see #ENABLED_STATE_SET 1130 * @see #FOCUSED_STATE_SET 1131 * @see #SELECTED_STATE_SET 1132 */ 1133 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1134 /** 1135 * Indicates the view is enabled, focused and its window has the focus. 1136 * 1137 * @see #ENABLED_STATE_SET 1138 * @see #FOCUSED_STATE_SET 1139 * @see #WINDOW_FOCUSED_STATE_SET 1140 */ 1141 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1142 /** 1143 * Indicates the view is enabled, selected and its window has the focus. 1144 * 1145 * @see #ENABLED_STATE_SET 1146 * @see #SELECTED_STATE_SET 1147 * @see #WINDOW_FOCUSED_STATE_SET 1148 */ 1149 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1150 /** 1151 * Indicates the view is focused, selected and its window has the focus. 1152 * 1153 * @see #FOCUSED_STATE_SET 1154 * @see #SELECTED_STATE_SET 1155 * @see #WINDOW_FOCUSED_STATE_SET 1156 */ 1157 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1158 /** 1159 * Indicates the view is enabled, focused, selected and its window 1160 * has the focus. 1161 * 1162 * @see #ENABLED_STATE_SET 1163 * @see #FOCUSED_STATE_SET 1164 * @see #SELECTED_STATE_SET 1165 * @see #WINDOW_FOCUSED_STATE_SET 1166 */ 1167 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1168 /** 1169 * Indicates the view is pressed and its window has the focus. 1170 * 1171 * @see #PRESSED_STATE_SET 1172 * @see #WINDOW_FOCUSED_STATE_SET 1173 */ 1174 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1175 /** 1176 * Indicates the view is pressed and selected. 1177 * 1178 * @see #PRESSED_STATE_SET 1179 * @see #SELECTED_STATE_SET 1180 */ 1181 protected static final int[] PRESSED_SELECTED_STATE_SET; 1182 /** 1183 * Indicates the view is pressed, selected and its window has the focus. 1184 * 1185 * @see #PRESSED_STATE_SET 1186 * @see #SELECTED_STATE_SET 1187 * @see #WINDOW_FOCUSED_STATE_SET 1188 */ 1189 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1190 /** 1191 * Indicates the view is pressed and focused. 1192 * 1193 * @see #PRESSED_STATE_SET 1194 * @see #FOCUSED_STATE_SET 1195 */ 1196 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1197 /** 1198 * Indicates the view is pressed, focused and its window has the focus. 1199 * 1200 * @see #PRESSED_STATE_SET 1201 * @see #FOCUSED_STATE_SET 1202 * @see #WINDOW_FOCUSED_STATE_SET 1203 */ 1204 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1205 /** 1206 * Indicates the view is pressed, focused and selected. 1207 * 1208 * @see #PRESSED_STATE_SET 1209 * @see #SELECTED_STATE_SET 1210 * @see #FOCUSED_STATE_SET 1211 */ 1212 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1213 /** 1214 * Indicates the view is pressed, focused, selected and its window has the focus. 1215 * 1216 * @see #PRESSED_STATE_SET 1217 * @see #FOCUSED_STATE_SET 1218 * @see #SELECTED_STATE_SET 1219 * @see #WINDOW_FOCUSED_STATE_SET 1220 */ 1221 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1222 /** 1223 * Indicates the view is pressed and enabled. 1224 * 1225 * @see #PRESSED_STATE_SET 1226 * @see #ENABLED_STATE_SET 1227 */ 1228 protected static final int[] PRESSED_ENABLED_STATE_SET; 1229 /** 1230 * Indicates the view is pressed, enabled and its window has the focus. 1231 * 1232 * @see #PRESSED_STATE_SET 1233 * @see #ENABLED_STATE_SET 1234 * @see #WINDOW_FOCUSED_STATE_SET 1235 */ 1236 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1237 /** 1238 * Indicates the view is pressed, enabled and selected. 1239 * 1240 * @see #PRESSED_STATE_SET 1241 * @see #ENABLED_STATE_SET 1242 * @see #SELECTED_STATE_SET 1243 */ 1244 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1245 /** 1246 * Indicates the view is pressed, enabled, selected and its window has the 1247 * focus. 1248 * 1249 * @see #PRESSED_STATE_SET 1250 * @see #ENABLED_STATE_SET 1251 * @see #SELECTED_STATE_SET 1252 * @see #WINDOW_FOCUSED_STATE_SET 1253 */ 1254 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1255 /** 1256 * Indicates the view is pressed, enabled and focused. 1257 * 1258 * @see #PRESSED_STATE_SET 1259 * @see #ENABLED_STATE_SET 1260 * @see #FOCUSED_STATE_SET 1261 */ 1262 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1263 /** 1264 * Indicates the view is pressed, enabled, focused and its window has the 1265 * focus. 1266 * 1267 * @see #PRESSED_STATE_SET 1268 * @see #ENABLED_STATE_SET 1269 * @see #FOCUSED_STATE_SET 1270 * @see #WINDOW_FOCUSED_STATE_SET 1271 */ 1272 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1273 /** 1274 * Indicates the view is pressed, enabled, focused and selected. 1275 * 1276 * @see #PRESSED_STATE_SET 1277 * @see #ENABLED_STATE_SET 1278 * @see #SELECTED_STATE_SET 1279 * @see #FOCUSED_STATE_SET 1280 */ 1281 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1282 /** 1283 * Indicates the view is pressed, enabled, focused, selected and its window 1284 * has the focus. 1285 * 1286 * @see #PRESSED_STATE_SET 1287 * @see #ENABLED_STATE_SET 1288 * @see #SELECTED_STATE_SET 1289 * @see #FOCUSED_STATE_SET 1290 * @see #WINDOW_FOCUSED_STATE_SET 1291 */ 1292 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1293 1294 /** 1295 * The order here is very important to {@link #getDrawableState()} 1296 */ 1297 private static final int[][] VIEW_STATE_SETS; 1298 1299 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1300 static final int VIEW_STATE_SELECTED = 1 << 1; 1301 static final int VIEW_STATE_FOCUSED = 1 << 2; 1302 static final int VIEW_STATE_ENABLED = 1 << 3; 1303 static final int VIEW_STATE_PRESSED = 1 << 4; 1304 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1305 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1306 1307 static final int[] VIEW_STATE_IDS = new int[] { 1308 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1309 R.attr.state_selected, VIEW_STATE_SELECTED, 1310 R.attr.state_focused, VIEW_STATE_FOCUSED, 1311 R.attr.state_enabled, VIEW_STATE_ENABLED, 1312 R.attr.state_pressed, VIEW_STATE_PRESSED, 1313 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1314 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1315 }; 1316 1317 static { 1318 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1319 throw new IllegalStateException( 1320 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1321 } 1322 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1323 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1324 int viewState = R.styleable.ViewDrawableStates[i]; 1325 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1326 if (VIEW_STATE_IDS[j] == viewState) { 1327 orderedIds[i * 2] = viewState; 1328 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1329 } 1330 } 1331 } 1332 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1333 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1334 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1335 int numBits = Integer.bitCount(i); 1336 int[] set = new int[numBits]; 1337 int pos = 0; 1338 for (int j = 0; j < orderedIds.length; j += 2) { 1339 if ((i & orderedIds[j+1]) != 0) { 1340 set[pos++] = orderedIds[j]; 1341 } 1342 } 1343 VIEW_STATE_SETS[i] = set; 1344 } 1345 1346 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1347 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1348 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1349 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1350 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1351 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1352 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1353 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1354 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1355 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1356 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1357 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1358 | VIEW_STATE_FOCUSED]; 1359 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1360 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1361 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1362 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1363 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1364 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1365 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1366 | VIEW_STATE_ENABLED]; 1367 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1368 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1369 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1370 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1371 | VIEW_STATE_ENABLED]; 1372 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1373 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1374 | VIEW_STATE_ENABLED]; 1375 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1376 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1377 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1378 1379 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1380 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1381 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1382 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1383 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1384 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1385 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1386 | VIEW_STATE_PRESSED]; 1387 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1388 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1389 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1390 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1391 | VIEW_STATE_PRESSED]; 1392 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1393 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1394 | VIEW_STATE_PRESSED]; 1395 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1396 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1397 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1398 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1399 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1400 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1401 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1402 | VIEW_STATE_PRESSED]; 1403 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1404 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1405 | VIEW_STATE_PRESSED]; 1406 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1407 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1408 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1409 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1410 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1411 | VIEW_STATE_PRESSED]; 1412 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1413 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1414 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1415 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1416 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1417 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1418 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1419 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1420 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1421 | VIEW_STATE_PRESSED]; 1422 } 1423 1424 /** 1425 * Used by views that contain lists of items. This state indicates that 1426 * the view is showing the last item. 1427 * @hide 1428 */ 1429 protected static final int[] LAST_STATE_SET = {R.attr.state_last}; 1430 /** 1431 * Used by views that contain lists of items. This state indicates that 1432 * the view is showing the first item. 1433 * @hide 1434 */ 1435 protected static final int[] FIRST_STATE_SET = {R.attr.state_first}; 1436 /** 1437 * Used by views that contain lists of items. This state indicates that 1438 * the view is showing the middle item. 1439 * @hide 1440 */ 1441 protected static final int[] MIDDLE_STATE_SET = {R.attr.state_middle}; 1442 /** 1443 * Used by views that contain lists of items. This state indicates that 1444 * the view is showing only one item. 1445 * @hide 1446 */ 1447 protected static final int[] SINGLE_STATE_SET = {R.attr.state_single}; 1448 /** 1449 * Used by views that contain lists of items. This state indicates that 1450 * the view is pressed and showing the last item. 1451 * @hide 1452 */ 1453 protected static final int[] PRESSED_LAST_STATE_SET = {R.attr.state_last, R.attr.state_pressed}; 1454 /** 1455 * Used by views that contain lists of items. This state indicates that 1456 * the view is pressed and showing the first item. 1457 * @hide 1458 */ 1459 protected static final int[] PRESSED_FIRST_STATE_SET = {R.attr.state_first, R.attr.state_pressed}; 1460 /** 1461 * Used by views that contain lists of items. This state indicates that 1462 * the view is pressed and showing the middle item. 1463 * @hide 1464 */ 1465 protected static final int[] PRESSED_MIDDLE_STATE_SET = {R.attr.state_middle, R.attr.state_pressed}; 1466 /** 1467 * Used by views that contain lists of items. This state indicates that 1468 * the view is pressed and showing only one item. 1469 * @hide 1470 */ 1471 protected static final int[] PRESSED_SINGLE_STATE_SET = {R.attr.state_single, R.attr.state_pressed}; 1472 1473 /** 1474 * Temporary Rect currently for use in setBackground(). This will probably 1475 * be extended in the future to hold our own class with more than just 1476 * a Rect. :) 1477 */ 1478 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1479 1480 /** 1481 * Map used to store views' tags. 1482 */ 1483 private static WeakHashMap<View, SparseArray<Object>> sTags; 1484 1485 /** 1486 * Lock used to access sTags. 1487 */ 1488 private static final Object sTagsLock = new Object(); 1489 1490 /** 1491 * The animation currently associated with this view. 1492 * @hide 1493 */ 1494 protected Animation mCurrentAnimation = null; 1495 1496 /** 1497 * Width as measured during measure pass. 1498 * {@hide} 1499 */ 1500 @ViewDebug.ExportedProperty(category = "measurement") 1501 /*package*/ int mMeasuredWidth; 1502 1503 /** 1504 * Height as measured during measure pass. 1505 * {@hide} 1506 */ 1507 @ViewDebug.ExportedProperty(category = "measurement") 1508 /*package*/ int mMeasuredHeight; 1509 1510 /** 1511 * The view's identifier. 1512 * {@hide} 1513 * 1514 * @see #setId(int) 1515 * @see #getId() 1516 */ 1517 @ViewDebug.ExportedProperty(resolveId = true) 1518 int mID = NO_ID; 1519 1520 /** 1521 * The view's tag. 1522 * {@hide} 1523 * 1524 * @see #setTag(Object) 1525 * @see #getTag() 1526 */ 1527 protected Object mTag; 1528 1529 // for mPrivateFlags: 1530 /** {@hide} */ 1531 static final int WANTS_FOCUS = 0x00000001; 1532 /** {@hide} */ 1533 static final int FOCUSED = 0x00000002; 1534 /** {@hide} */ 1535 static final int SELECTED = 0x00000004; 1536 /** {@hide} */ 1537 static final int IS_ROOT_NAMESPACE = 0x00000008; 1538 /** {@hide} */ 1539 static final int HAS_BOUNDS = 0x00000010; 1540 /** {@hide} */ 1541 static final int DRAWN = 0x00000020; 1542 /** 1543 * When this flag is set, this view is running an animation on behalf of its 1544 * children and should therefore not cancel invalidate requests, even if they 1545 * lie outside of this view's bounds. 1546 * 1547 * {@hide} 1548 */ 1549 static final int DRAW_ANIMATION = 0x00000040; 1550 /** {@hide} */ 1551 static final int SKIP_DRAW = 0x00000080; 1552 /** {@hide} */ 1553 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1554 /** {@hide} */ 1555 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1556 /** {@hide} */ 1557 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1558 /** {@hide} */ 1559 static final int MEASURED_DIMENSION_SET = 0x00000800; 1560 /** {@hide} */ 1561 static final int FORCE_LAYOUT = 0x00001000; 1562 /** {@hide} */ 1563 static final int LAYOUT_REQUIRED = 0x00002000; 1564 1565 private static final int PRESSED = 0x00004000; 1566 1567 /** {@hide} */ 1568 static final int DRAWING_CACHE_VALID = 0x00008000; 1569 /** 1570 * Flag used to indicate that this view should be drawn once more (and only once 1571 * more) after its animation has completed. 1572 * {@hide} 1573 */ 1574 static final int ANIMATION_STARTED = 0x00010000; 1575 1576 private static final int SAVE_STATE_CALLED = 0x00020000; 1577 1578 /** 1579 * Indicates that the View returned true when onSetAlpha() was called and that 1580 * the alpha must be restored. 1581 * {@hide} 1582 */ 1583 static final int ALPHA_SET = 0x00040000; 1584 1585 /** 1586 * Set by {@link #setScrollContainer(boolean)}. 1587 */ 1588 static final int SCROLL_CONTAINER = 0x00080000; 1589 1590 /** 1591 * Set by {@link #setScrollContainer(boolean)}. 1592 */ 1593 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1594 1595 /** 1596 * View flag indicating whether this view was invalidated (fully or partially.) 1597 * 1598 * @hide 1599 */ 1600 static final int DIRTY = 0x00200000; 1601 1602 /** 1603 * View flag indicating whether this view was invalidated by an opaque 1604 * invalidate request. 1605 * 1606 * @hide 1607 */ 1608 static final int DIRTY_OPAQUE = 0x00400000; 1609 1610 /** 1611 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1612 * 1613 * @hide 1614 */ 1615 static final int DIRTY_MASK = 0x00600000; 1616 1617 /** 1618 * Indicates whether the background is opaque. 1619 * 1620 * @hide 1621 */ 1622 static final int OPAQUE_BACKGROUND = 0x00800000; 1623 1624 /** 1625 * Indicates whether the scrollbars are opaque. 1626 * 1627 * @hide 1628 */ 1629 static final int OPAQUE_SCROLLBARS = 0x01000000; 1630 1631 /** 1632 * Indicates whether the view is opaque. 1633 * 1634 * @hide 1635 */ 1636 static final int OPAQUE_MASK = 0x01800000; 1637 1638 /** 1639 * Indicates a prepressed state; 1640 * the short time between ACTION_DOWN and recognizing 1641 * a 'real' press. Prepressed is used to recognize quick taps 1642 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1643 * 1644 * @hide 1645 */ 1646 private static final int PREPRESSED = 0x02000000; 1647 1648 /** 1649 * Indicates whether the view is temporarily detached. 1650 * 1651 * @hide 1652 */ 1653 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1654 1655 /** 1656 * Indicates that we should awaken scroll bars once attached 1657 * 1658 * @hide 1659 */ 1660 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1661 1662 /** 1663 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1664 * for transform operations 1665 * 1666 * @hide 1667 */ 1668 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1669 1670 /** {@hide} */ 1671 static final int ACTIVATED = 0x40000000; 1672 1673 /** 1674 * Always allow a user to over-scroll this view, provided it is a 1675 * view that can scroll. 1676 * 1677 * @see #getOverScrollMode() 1678 * @see #setOverScrollMode(int) 1679 */ 1680 public static final int OVER_SCROLL_ALWAYS = 0; 1681 1682 /** 1683 * Allow a user to over-scroll this view only if the content is large 1684 * enough to meaningfully scroll, provided it is a view that can scroll. 1685 * 1686 * @see #getOverScrollMode() 1687 * @see #setOverScrollMode(int) 1688 */ 1689 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1690 1691 /** 1692 * Never allow a user to over-scroll this view. 1693 * 1694 * @see #getOverScrollMode() 1695 * @see #setOverScrollMode(int) 1696 */ 1697 public static final int OVER_SCROLL_NEVER = 2; 1698 1699 /** 1700 * Controls the over-scroll mode for this view. 1701 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1702 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1703 * and {@link #OVER_SCROLL_NEVER}. 1704 */ 1705 private int mOverScrollMode; 1706 1707 /** 1708 * The parent this view is attached to. 1709 * {@hide} 1710 * 1711 * @see #getParent() 1712 */ 1713 protected ViewParent mParent; 1714 1715 /** 1716 * {@hide} 1717 */ 1718 AttachInfo mAttachInfo; 1719 1720 /** 1721 * {@hide} 1722 */ 1723 @ViewDebug.ExportedProperty(flagMapping = { 1724 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1725 name = "FORCE_LAYOUT"), 1726 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1727 name = "LAYOUT_REQUIRED"), 1728 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1729 name = "DRAWING_CACHE_INVALID", outputIf = false), 1730 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1731 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1732 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1733 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1734 }) 1735 int mPrivateFlags; 1736 1737 /** 1738 * Count of how many windows this view has been attached to. 1739 */ 1740 int mWindowAttachCount; 1741 1742 /** 1743 * The layout parameters associated with this view and used by the parent 1744 * {@link android.view.ViewGroup} to determine how this view should be 1745 * laid out. 1746 * {@hide} 1747 */ 1748 protected ViewGroup.LayoutParams mLayoutParams; 1749 1750 /** 1751 * The view flags hold various views states. 1752 * {@hide} 1753 */ 1754 @ViewDebug.ExportedProperty 1755 int mViewFlags; 1756 1757 /** 1758 * The transform matrix for the View. This transform is calculated internally 1759 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1760 * is used by default. Do *not* use this variable directly; instead call 1761 * getMatrix(), which will automatically recalculate the matrix if necessary 1762 * to get the correct matrix based on the latest rotation and scale properties. 1763 */ 1764 private final Matrix mMatrix = new Matrix(); 1765 1766 /** 1767 * The transform matrix for the View. This transform is calculated internally 1768 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1769 * is used by default. Do *not* use this variable directly; instead call 1770 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 1771 * to get the correct matrix based on the latest rotation and scale properties. 1772 */ 1773 private Matrix mInverseMatrix; 1774 1775 /** 1776 * An internal variable that tracks whether we need to recalculate the 1777 * transform matrix, based on whether the rotation or scaleX/Y properties 1778 * have changed since the matrix was last calculated. 1779 */ 1780 private boolean mMatrixDirty = false; 1781 1782 /** 1783 * An internal variable that tracks whether we need to recalculate the 1784 * transform matrix, based on whether the rotation or scaleX/Y properties 1785 * have changed since the matrix was last calculated. 1786 */ 1787 private boolean mInverseMatrixDirty = true; 1788 1789 /** 1790 * A variable that tracks whether we need to recalculate the 1791 * transform matrix, based on whether the rotation or scaleX/Y properties 1792 * have changed since the matrix was last calculated. This variable 1793 * is only valid after a call to updateMatrix() or to a function that 1794 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 1795 */ 1796 private boolean mMatrixIsIdentity = true; 1797 1798 /** 1799 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 1800 */ 1801 private Camera mCamera = null; 1802 1803 /** 1804 * This matrix is used when computing the matrix for 3D rotations. 1805 */ 1806 private Matrix matrix3D = null; 1807 1808 /** 1809 * These prev values are used to recalculate a centered pivot point when necessary. The 1810 * pivot point is only used in matrix operations (when rotation, scale, or translation are 1811 * set), so thes values are only used then as well. 1812 */ 1813 private int mPrevWidth = -1; 1814 private int mPrevHeight = -1; 1815 1816 /** 1817 * Convenience value to check for float values that are close enough to zero to be considered 1818 * zero. 1819 */ 1820 private static final float NONZERO_EPSILON = .001f; 1821 1822 /** 1823 * The degrees rotation around the vertical axis through the pivot point. 1824 */ 1825 @ViewDebug.ExportedProperty 1826 private float mRotationY = 0f; 1827 1828 /** 1829 * The degrees rotation around the horizontal axis through the pivot point. 1830 */ 1831 @ViewDebug.ExportedProperty 1832 private float mRotationX = 0f; 1833 1834 /** 1835 * The degrees rotation around the pivot point. 1836 */ 1837 @ViewDebug.ExportedProperty 1838 private float mRotation = 0f; 1839 1840 /** 1841 * The amount of translation of the object away from its left property (post-layout). 1842 */ 1843 @ViewDebug.ExportedProperty 1844 private float mTranslationX = 0f; 1845 1846 /** 1847 * The amount of translation of the object away from its top property (post-layout). 1848 */ 1849 @ViewDebug.ExportedProperty 1850 private float mTranslationY = 0f; 1851 1852 /** 1853 * The amount of scale in the x direction around the pivot point. A 1854 * value of 1 means no scaling is applied. 1855 */ 1856 @ViewDebug.ExportedProperty 1857 private float mScaleX = 1f; 1858 1859 /** 1860 * The amount of scale in the y direction around the pivot point. A 1861 * value of 1 means no scaling is applied. 1862 */ 1863 @ViewDebug.ExportedProperty 1864 private float mScaleY = 1f; 1865 1866 /** 1867 * The amount of scale in the x direction around the pivot point. A 1868 * value of 1 means no scaling is applied. 1869 */ 1870 @ViewDebug.ExportedProperty 1871 private float mPivotX = 0f; 1872 1873 /** 1874 * The amount of scale in the y direction around the pivot point. A 1875 * value of 1 means no scaling is applied. 1876 */ 1877 @ViewDebug.ExportedProperty 1878 private float mPivotY = 0f; 1879 1880 /** 1881 * The opacity of the View. This is a value from 0 to 1, where 0 means 1882 * completely transparent and 1 means completely opaque. 1883 */ 1884 @ViewDebug.ExportedProperty 1885 private float mAlpha = 1f; 1886 1887 /** 1888 * The distance in pixels from the left edge of this view's parent 1889 * to the left edge of this view. 1890 * {@hide} 1891 */ 1892 @ViewDebug.ExportedProperty(category = "layout") 1893 protected int mLeft; 1894 /** 1895 * The distance in pixels from the left edge of this view's parent 1896 * to the right edge of this view. 1897 * {@hide} 1898 */ 1899 @ViewDebug.ExportedProperty(category = "layout") 1900 protected int mRight; 1901 /** 1902 * The distance in pixels from the top edge of this view's parent 1903 * to the top edge of this view. 1904 * {@hide} 1905 */ 1906 @ViewDebug.ExportedProperty(category = "layout") 1907 protected int mTop; 1908 /** 1909 * The distance in pixels from the top edge of this view's parent 1910 * to the bottom edge of this view. 1911 * {@hide} 1912 */ 1913 @ViewDebug.ExportedProperty(category = "layout") 1914 protected int mBottom; 1915 1916 /** 1917 * The offset, in pixels, by which the content of this view is scrolled 1918 * horizontally. 1919 * {@hide} 1920 */ 1921 @ViewDebug.ExportedProperty(category = "scrolling") 1922 protected int mScrollX; 1923 /** 1924 * The offset, in pixels, by which the content of this view is scrolled 1925 * vertically. 1926 * {@hide} 1927 */ 1928 @ViewDebug.ExportedProperty(category = "scrolling") 1929 protected int mScrollY; 1930 1931 /** 1932 * The left padding in pixels, that is the distance in pixels between the 1933 * left edge of this view and the left edge of its content. 1934 * {@hide} 1935 */ 1936 @ViewDebug.ExportedProperty(category = "padding") 1937 protected int mPaddingLeft; 1938 /** 1939 * The right padding in pixels, that is the distance in pixels between the 1940 * right edge of this view and the right edge of its content. 1941 * {@hide} 1942 */ 1943 @ViewDebug.ExportedProperty(category = "padding") 1944 protected int mPaddingRight; 1945 /** 1946 * The top padding in pixels, that is the distance in pixels between the 1947 * top edge of this view and the top edge of its content. 1948 * {@hide} 1949 */ 1950 @ViewDebug.ExportedProperty(category = "padding") 1951 protected int mPaddingTop; 1952 /** 1953 * The bottom padding in pixels, that is the distance in pixels between the 1954 * bottom edge of this view and the bottom edge of its content. 1955 * {@hide} 1956 */ 1957 @ViewDebug.ExportedProperty(category = "padding") 1958 protected int mPaddingBottom; 1959 1960 /** 1961 * Briefly describes the view and is primarily used for accessibility support. 1962 */ 1963 private CharSequence mContentDescription; 1964 1965 /** 1966 * Cache the paddingRight set by the user to append to the scrollbar's size. 1967 */ 1968 @ViewDebug.ExportedProperty(category = "padding") 1969 int mUserPaddingRight; 1970 1971 /** 1972 * Cache the paddingBottom set by the user to append to the scrollbar's size. 1973 */ 1974 @ViewDebug.ExportedProperty(category = "padding") 1975 int mUserPaddingBottom; 1976 1977 /** 1978 * Cache the paddingLeft set by the user to append to the scrollbar's size. 1979 */ 1980 @ViewDebug.ExportedProperty(category = "padding") 1981 int mUserPaddingLeft; 1982 1983 /** 1984 * @hide 1985 */ 1986 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 1987 /** 1988 * @hide 1989 */ 1990 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 1991 1992 private Resources mResources = null; 1993 1994 private Drawable mBGDrawable; 1995 1996 private int mBackgroundResource; 1997 private boolean mBackgroundSizeChanged; 1998 1999 /** 2000 * Listener used to dispatch focus change events. 2001 * This field should be made private, so it is hidden from the SDK. 2002 * {@hide} 2003 */ 2004 protected OnFocusChangeListener mOnFocusChangeListener; 2005 2006 /** 2007 * Listeners for layout change events. 2008 */ 2009 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2010 2011 /** 2012 * Listener used to dispatch click events. 2013 * This field should be made private, so it is hidden from the SDK. 2014 * {@hide} 2015 */ 2016 protected OnClickListener mOnClickListener; 2017 2018 /** 2019 * Listener used to dispatch long click events. 2020 * This field should be made private, so it is hidden from the SDK. 2021 * {@hide} 2022 */ 2023 protected OnLongClickListener mOnLongClickListener; 2024 2025 /** 2026 * Listener used to build the context menu. 2027 * This field should be made private, so it is hidden from the SDK. 2028 * {@hide} 2029 */ 2030 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2031 2032 private OnKeyListener mOnKeyListener; 2033 2034 private OnTouchListener mOnTouchListener; 2035 2036 private OnDragListener mOnDragListener; 2037 2038 /** 2039 * The application environment this view lives in. 2040 * This field should be made private, so it is hidden from the SDK. 2041 * {@hide} 2042 */ 2043 protected Context mContext; 2044 2045 private ScrollabilityCache mScrollCache; 2046 2047 private int[] mDrawableState = null; 2048 2049 private Bitmap mDrawingCache; 2050 private Bitmap mUnscaledDrawingCache; 2051 private DisplayList mDisplayList; 2052 private HardwareLayer mHardwareLayer; 2053 2054 /** 2055 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2056 * the user may specify which view to go to next. 2057 */ 2058 private int mNextFocusLeftId = View.NO_ID; 2059 2060 /** 2061 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2062 * the user may specify which view to go to next. 2063 */ 2064 private int mNextFocusRightId = View.NO_ID; 2065 2066 /** 2067 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2068 * the user may specify which view to go to next. 2069 */ 2070 private int mNextFocusUpId = View.NO_ID; 2071 2072 /** 2073 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2074 * the user may specify which view to go to next. 2075 */ 2076 private int mNextFocusDownId = View.NO_ID; 2077 2078 /** 2079 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2080 * the user may specify which view to go to next. 2081 */ 2082 int mNextFocusForwardId = View.NO_ID; 2083 2084 private CheckForLongPress mPendingCheckForLongPress; 2085 private CheckForTap mPendingCheckForTap = null; 2086 private PerformClick mPerformClick; 2087 2088 private UnsetPressedState mUnsetPressedState; 2089 2090 /** 2091 * Whether the long press's action has been invoked. The tap's action is invoked on the 2092 * up event while a long press is invoked as soon as the long press duration is reached, so 2093 * a long press could be performed before the tap is checked, in which case the tap's action 2094 * should not be invoked. 2095 */ 2096 private boolean mHasPerformedLongPress; 2097 2098 /** 2099 * The minimum height of the view. We'll try our best to have the height 2100 * of this view to at least this amount. 2101 */ 2102 @ViewDebug.ExportedProperty(category = "measurement") 2103 private int mMinHeight; 2104 2105 /** 2106 * The minimum width of the view. We'll try our best to have the width 2107 * of this view to at least this amount. 2108 */ 2109 @ViewDebug.ExportedProperty(category = "measurement") 2110 private int mMinWidth; 2111 2112 /** 2113 * The delegate to handle touch events that are physically in this view 2114 * but should be handled by another view. 2115 */ 2116 private TouchDelegate mTouchDelegate = null; 2117 2118 /** 2119 * Solid color to use as a background when creating the drawing cache. Enables 2120 * the cache to use 16 bit bitmaps instead of 32 bit. 2121 */ 2122 private int mDrawingCacheBackgroundColor = 0; 2123 2124 /** 2125 * Special tree observer used when mAttachInfo is null. 2126 */ 2127 private ViewTreeObserver mFloatingTreeObserver; 2128 2129 /** 2130 * Cache the touch slop from the context that created the view. 2131 */ 2132 private int mTouchSlop; 2133 2134 /** 2135 * Cache drag/drop state 2136 * 2137 */ 2138 boolean mCanAcceptDrop; 2139 2140 /** 2141 * Position of the vertical scroll bar. 2142 */ 2143 private int mVerticalScrollbarPosition; 2144 2145 /** 2146 * Position the scroll bar at the default position as determined by the system. 2147 */ 2148 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2149 2150 /** 2151 * Position the scroll bar along the left edge. 2152 */ 2153 public static final int SCROLLBAR_POSITION_LEFT = 1; 2154 2155 /** 2156 * Position the scroll bar along the right edge. 2157 */ 2158 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2159 2160 /** 2161 * Indicates that the view does not have a layer. 2162 * 2163 * @see #getLayerType() 2164 * @see #setLayerType(int, android.graphics.Paint) 2165 * @see #LAYER_TYPE_SOFTWARE 2166 * @see #LAYER_TYPE_HARDWARE 2167 */ 2168 public static final int LAYER_TYPE_NONE = 0; 2169 2170 /** 2171 * <p>Indicates that the view has a software layer. A software layer is backed 2172 * by a bitmap and causes the view to be rendered using Android's software 2173 * rendering pipeline, even if hardware acceleration is enabled.</p> 2174 * 2175 * <p>Software layers have various usages:</p> 2176 * <p>When the application is not using hardware acceleration, a software layer 2177 * is useful to apply a specific color filter and/or blending mode and/or 2178 * translucency to a view and all its children.</p> 2179 * <p>When the application is using hardware acceleration, a software layer 2180 * is useful to render drawing primitives not supported by the hardware 2181 * accelerated pipeline. It can also be used to cache a complex view tree 2182 * into a texture and reduce the complexity of drawing operations. For instance, 2183 * when animating a complex view tree with a translation, a software layer can 2184 * be used to render the view tree only once.</p> 2185 * <p>Software layers should be avoided when the affected view tree updates 2186 * often. Every update will require to re-render the software layer, which can 2187 * potentially be slow (particularly when hardware acceleration is turned on 2188 * since the layer will have to be uploaded into a hardware texture after every 2189 * update.)</p> 2190 * 2191 * @see #getLayerType() 2192 * @see #setLayerType(int, android.graphics.Paint) 2193 * @see #LAYER_TYPE_NONE 2194 * @see #LAYER_TYPE_HARDWARE 2195 */ 2196 public static final int LAYER_TYPE_SOFTWARE = 1; 2197 2198 /** 2199 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2200 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2201 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2202 * rendering pipeline, but only if hardware acceleration is turned on for the 2203 * view hierarchy. When hardware acceleration is turned off, hardware layers 2204 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2205 * 2206 * <p>A hardware layer is useful to apply a specific color filter and/or 2207 * blending mode and/or translucency to a view and all its children.</p> 2208 * <p>A hardware layer can be used to cache a complex view tree into a 2209 * texture and reduce the complexity of drawing operations. For instance, 2210 * when animating a complex view tree with a translation, a hardware layer can 2211 * be used to render the view tree only once.</p> 2212 * <p>A hardware layer can also be used to increase the rendering quality when 2213 * rotation transformations are applied on a view. It can also be used to 2214 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2215 * 2216 * @see #getLayerType() 2217 * @see #setLayerType(int, android.graphics.Paint) 2218 * @see #LAYER_TYPE_NONE 2219 * @see #LAYER_TYPE_SOFTWARE 2220 */ 2221 public static final int LAYER_TYPE_HARDWARE = 2; 2222 2223 @ViewDebug.ExportedProperty(category = "drawing") 2224 int mLayerType = LAYER_TYPE_NONE; 2225 Paint mLayerPaint; 2226 2227 /** 2228 * Simple constructor to use when creating a view from code. 2229 * 2230 * @param context The Context the view is running in, through which it can 2231 * access the current theme, resources, etc. 2232 */ 2233 public View(Context context) { 2234 mContext = context; 2235 mResources = context != null ? context.getResources() : null; 2236 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 2237 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2238 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2239 } 2240 2241 /** 2242 * Constructor that is called when inflating a view from XML. This is called 2243 * when a view is being constructed from an XML file, supplying attributes 2244 * that were specified in the XML file. This version uses a default style of 2245 * 0, so the only attribute values applied are those in the Context's Theme 2246 * and the given AttributeSet. 2247 * 2248 * <p> 2249 * The method onFinishInflate() will be called after all children have been 2250 * added. 2251 * 2252 * @param context The Context the view is running in, through which it can 2253 * access the current theme, resources, etc. 2254 * @param attrs The attributes of the XML tag that is inflating the view. 2255 * @see #View(Context, AttributeSet, int) 2256 */ 2257 public View(Context context, AttributeSet attrs) { 2258 this(context, attrs, 0); 2259 } 2260 2261 /** 2262 * Perform inflation from XML and apply a class-specific base style. This 2263 * constructor of View allows subclasses to use their own base style when 2264 * they are inflating. For example, a Button class's constructor would call 2265 * this version of the super class constructor and supply 2266 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2267 * the theme's button style to modify all of the base view attributes (in 2268 * particular its background) as well as the Button class's attributes. 2269 * 2270 * @param context The Context the view is running in, through which it can 2271 * access the current theme, resources, etc. 2272 * @param attrs The attributes of the XML tag that is inflating the view. 2273 * @param defStyle The default style to apply to this view. If 0, no style 2274 * will be applied (beyond what is included in the theme). This may 2275 * either be an attribute resource, whose value will be retrieved 2276 * from the current theme, or an explicit style resource. 2277 * @see #View(Context, AttributeSet) 2278 */ 2279 public View(Context context, AttributeSet attrs, int defStyle) { 2280 this(context); 2281 2282 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2283 defStyle, 0); 2284 2285 Drawable background = null; 2286 2287 int leftPadding = -1; 2288 int topPadding = -1; 2289 int rightPadding = -1; 2290 int bottomPadding = -1; 2291 2292 int padding = -1; 2293 2294 int viewFlagValues = 0; 2295 int viewFlagMasks = 0; 2296 2297 boolean setScrollContainer = false; 2298 2299 int x = 0; 2300 int y = 0; 2301 2302 float tx = 0; 2303 float ty = 0; 2304 float rotation = 0; 2305 float rotationX = 0; 2306 float rotationY = 0; 2307 float sx = 1f; 2308 float sy = 1f; 2309 boolean transformSet = false; 2310 2311 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2312 2313 int overScrollMode = mOverScrollMode; 2314 final int N = a.getIndexCount(); 2315 for (int i = 0; i < N; i++) { 2316 int attr = a.getIndex(i); 2317 switch (attr) { 2318 case com.android.internal.R.styleable.View_background: 2319 background = a.getDrawable(attr); 2320 break; 2321 case com.android.internal.R.styleable.View_padding: 2322 padding = a.getDimensionPixelSize(attr, -1); 2323 break; 2324 case com.android.internal.R.styleable.View_paddingLeft: 2325 leftPadding = a.getDimensionPixelSize(attr, -1); 2326 break; 2327 case com.android.internal.R.styleable.View_paddingTop: 2328 topPadding = a.getDimensionPixelSize(attr, -1); 2329 break; 2330 case com.android.internal.R.styleable.View_paddingRight: 2331 rightPadding = a.getDimensionPixelSize(attr, -1); 2332 break; 2333 case com.android.internal.R.styleable.View_paddingBottom: 2334 bottomPadding = a.getDimensionPixelSize(attr, -1); 2335 break; 2336 case com.android.internal.R.styleable.View_scrollX: 2337 x = a.getDimensionPixelOffset(attr, 0); 2338 break; 2339 case com.android.internal.R.styleable.View_scrollY: 2340 y = a.getDimensionPixelOffset(attr, 0); 2341 break; 2342 case com.android.internal.R.styleable.View_alpha: 2343 setAlpha(a.getFloat(attr, 1f)); 2344 break; 2345 case com.android.internal.R.styleable.View_transformPivotX: 2346 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2347 break; 2348 case com.android.internal.R.styleable.View_transformPivotY: 2349 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2350 break; 2351 case com.android.internal.R.styleable.View_translationX: 2352 tx = a.getDimensionPixelOffset(attr, 0); 2353 transformSet = true; 2354 break; 2355 case com.android.internal.R.styleable.View_translationY: 2356 ty = a.getDimensionPixelOffset(attr, 0); 2357 transformSet = true; 2358 break; 2359 case com.android.internal.R.styleable.View_rotation: 2360 rotation = a.getFloat(attr, 0); 2361 transformSet = true; 2362 break; 2363 case com.android.internal.R.styleable.View_rotationX: 2364 rotationX = a.getFloat(attr, 0); 2365 transformSet = true; 2366 break; 2367 case com.android.internal.R.styleable.View_rotationY: 2368 rotationY = a.getFloat(attr, 0); 2369 transformSet = true; 2370 break; 2371 case com.android.internal.R.styleable.View_scaleX: 2372 sx = a.getFloat(attr, 1f); 2373 transformSet = true; 2374 break; 2375 case com.android.internal.R.styleable.View_scaleY: 2376 sy = a.getFloat(attr, 1f); 2377 transformSet = true; 2378 break; 2379 case com.android.internal.R.styleable.View_id: 2380 mID = a.getResourceId(attr, NO_ID); 2381 break; 2382 case com.android.internal.R.styleable.View_tag: 2383 mTag = a.getText(attr); 2384 break; 2385 case com.android.internal.R.styleable.View_fitsSystemWindows: 2386 if (a.getBoolean(attr, false)) { 2387 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2388 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2389 } 2390 break; 2391 case com.android.internal.R.styleable.View_focusable: 2392 if (a.getBoolean(attr, false)) { 2393 viewFlagValues |= FOCUSABLE; 2394 viewFlagMasks |= FOCUSABLE_MASK; 2395 } 2396 break; 2397 case com.android.internal.R.styleable.View_focusableInTouchMode: 2398 if (a.getBoolean(attr, false)) { 2399 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2400 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2401 } 2402 break; 2403 case com.android.internal.R.styleable.View_clickable: 2404 if (a.getBoolean(attr, false)) { 2405 viewFlagValues |= CLICKABLE; 2406 viewFlagMasks |= CLICKABLE; 2407 } 2408 break; 2409 case com.android.internal.R.styleable.View_longClickable: 2410 if (a.getBoolean(attr, false)) { 2411 viewFlagValues |= LONG_CLICKABLE; 2412 viewFlagMasks |= LONG_CLICKABLE; 2413 } 2414 break; 2415 case com.android.internal.R.styleable.View_saveEnabled: 2416 if (!a.getBoolean(attr, true)) { 2417 viewFlagValues |= SAVE_DISABLED; 2418 viewFlagMasks |= SAVE_DISABLED_MASK; 2419 } 2420 break; 2421 case com.android.internal.R.styleable.View_duplicateParentState: 2422 if (a.getBoolean(attr, false)) { 2423 viewFlagValues |= DUPLICATE_PARENT_STATE; 2424 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2425 } 2426 break; 2427 case com.android.internal.R.styleable.View_visibility: 2428 final int visibility = a.getInt(attr, 0); 2429 if (visibility != 0) { 2430 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2431 viewFlagMasks |= VISIBILITY_MASK; 2432 } 2433 break; 2434 case com.android.internal.R.styleable.View_drawingCacheQuality: 2435 final int cacheQuality = a.getInt(attr, 0); 2436 if (cacheQuality != 0) { 2437 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2438 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2439 } 2440 break; 2441 case com.android.internal.R.styleable.View_contentDescription: 2442 mContentDescription = a.getString(attr); 2443 break; 2444 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2445 if (!a.getBoolean(attr, true)) { 2446 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2447 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2448 } 2449 break; 2450 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2451 if (!a.getBoolean(attr, true)) { 2452 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2453 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2454 } 2455 break; 2456 case R.styleable.View_scrollbars: 2457 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2458 if (scrollbars != SCROLLBARS_NONE) { 2459 viewFlagValues |= scrollbars; 2460 viewFlagMasks |= SCROLLBARS_MASK; 2461 initializeScrollbars(a); 2462 } 2463 break; 2464 case R.styleable.View_fadingEdge: 2465 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2466 if (fadingEdge != FADING_EDGE_NONE) { 2467 viewFlagValues |= fadingEdge; 2468 viewFlagMasks |= FADING_EDGE_MASK; 2469 initializeFadingEdge(a); 2470 } 2471 break; 2472 case R.styleable.View_scrollbarStyle: 2473 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2474 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2475 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2476 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2477 } 2478 break; 2479 case R.styleable.View_isScrollContainer: 2480 setScrollContainer = true; 2481 if (a.getBoolean(attr, false)) { 2482 setScrollContainer(true); 2483 } 2484 break; 2485 case com.android.internal.R.styleable.View_keepScreenOn: 2486 if (a.getBoolean(attr, false)) { 2487 viewFlagValues |= KEEP_SCREEN_ON; 2488 viewFlagMasks |= KEEP_SCREEN_ON; 2489 } 2490 break; 2491 case R.styleable.View_filterTouchesWhenObscured: 2492 if (a.getBoolean(attr, false)) { 2493 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2494 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2495 } 2496 break; 2497 case R.styleable.View_nextFocusLeft: 2498 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2499 break; 2500 case R.styleable.View_nextFocusRight: 2501 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2502 break; 2503 case R.styleable.View_nextFocusUp: 2504 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2505 break; 2506 case R.styleable.View_nextFocusDown: 2507 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2508 break; 2509 case R.styleable.View_nextFocusForward: 2510 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2511 break; 2512 case R.styleable.View_minWidth: 2513 mMinWidth = a.getDimensionPixelSize(attr, 0); 2514 break; 2515 case R.styleable.View_minHeight: 2516 mMinHeight = a.getDimensionPixelSize(attr, 0); 2517 break; 2518 case R.styleable.View_onClick: 2519 if (context.isRestricted()) { 2520 throw new IllegalStateException("The android:onClick attribute cannot " 2521 + "be used within a restricted context"); 2522 } 2523 2524 final String handlerName = a.getString(attr); 2525 if (handlerName != null) { 2526 setOnClickListener(new OnClickListener() { 2527 private Method mHandler; 2528 2529 public void onClick(View v) { 2530 if (mHandler == null) { 2531 try { 2532 mHandler = getContext().getClass().getMethod(handlerName, 2533 View.class); 2534 } catch (NoSuchMethodException e) { 2535 int id = getId(); 2536 String idText = id == NO_ID ? "" : " with id '" 2537 + getContext().getResources().getResourceEntryName( 2538 id) + "'"; 2539 throw new IllegalStateException("Could not find a method " + 2540 handlerName + "(View) in the activity " 2541 + getContext().getClass() + " for onClick handler" 2542 + " on view " + View.this.getClass() + idText, e); 2543 } 2544 } 2545 2546 try { 2547 mHandler.invoke(getContext(), View.this); 2548 } catch (IllegalAccessException e) { 2549 throw new IllegalStateException("Could not execute non " 2550 + "public method of the activity", e); 2551 } catch (InvocationTargetException e) { 2552 throw new IllegalStateException("Could not execute " 2553 + "method of the activity", e); 2554 } 2555 } 2556 }); 2557 } 2558 break; 2559 case R.styleable.View_overScrollMode: 2560 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2561 break; 2562 case R.styleable.View_verticalScrollbarPosition: 2563 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2564 break; 2565 case R.styleable.View_layerType: 2566 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2567 break; 2568 } 2569 } 2570 2571 setOverScrollMode(overScrollMode); 2572 2573 if (background != null) { 2574 setBackgroundDrawable(background); 2575 } 2576 2577 if (padding >= 0) { 2578 leftPadding = padding; 2579 topPadding = padding; 2580 rightPadding = padding; 2581 bottomPadding = padding; 2582 } 2583 2584 // If the user specified the padding (either with android:padding or 2585 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2586 // use the default padding or the padding from the background drawable 2587 // (stored at this point in mPadding*) 2588 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2589 topPadding >= 0 ? topPadding : mPaddingTop, 2590 rightPadding >= 0 ? rightPadding : mPaddingRight, 2591 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2592 2593 if (viewFlagMasks != 0) { 2594 setFlags(viewFlagValues, viewFlagMasks); 2595 } 2596 2597 // Needs to be called after mViewFlags is set 2598 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2599 recomputePadding(); 2600 } 2601 2602 if (x != 0 || y != 0) { 2603 scrollTo(x, y); 2604 } 2605 2606 if (transformSet) { 2607 setTranslationX(tx); 2608 setTranslationY(ty); 2609 setRotation(rotation); 2610 setRotationX(rotationX); 2611 setRotationY(rotationY); 2612 setScaleX(sx); 2613 setScaleY(sy); 2614 } 2615 2616 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2617 setScrollContainer(true); 2618 } 2619 2620 computeOpaqueFlags(); 2621 2622 a.recycle(); 2623 } 2624 2625 /** 2626 * Non-public constructor for use in testing 2627 */ 2628 View() { 2629 } 2630 2631 /** 2632 * <p> 2633 * Initializes the fading edges from a given set of styled attributes. This 2634 * method should be called by subclasses that need fading edges and when an 2635 * instance of these subclasses is created programmatically rather than 2636 * being inflated from XML. This method is automatically called when the XML 2637 * is inflated. 2638 * </p> 2639 * 2640 * @param a the styled attributes set to initialize the fading edges from 2641 */ 2642 protected void initializeFadingEdge(TypedArray a) { 2643 initScrollCache(); 2644 2645 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2646 R.styleable.View_fadingEdgeLength, 2647 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2648 } 2649 2650 /** 2651 * Returns the size of the vertical faded edges used to indicate that more 2652 * content in this view is visible. 2653 * 2654 * @return The size in pixels of the vertical faded edge or 0 if vertical 2655 * faded edges are not enabled for this view. 2656 * @attr ref android.R.styleable#View_fadingEdgeLength 2657 */ 2658 public int getVerticalFadingEdgeLength() { 2659 if (isVerticalFadingEdgeEnabled()) { 2660 ScrollabilityCache cache = mScrollCache; 2661 if (cache != null) { 2662 return cache.fadingEdgeLength; 2663 } 2664 } 2665 return 0; 2666 } 2667 2668 /** 2669 * Set the size of the faded edge used to indicate that more content in this 2670 * view is available. Will not change whether the fading edge is enabled; use 2671 * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled} 2672 * to enable the fading edge for the vertical or horizontal fading edges. 2673 * 2674 * @param length The size in pixels of the faded edge used to indicate that more 2675 * content in this view is visible. 2676 */ 2677 public void setFadingEdgeLength(int length) { 2678 initScrollCache(); 2679 mScrollCache.fadingEdgeLength = length; 2680 } 2681 2682 /** 2683 * Returns the size of the horizontal faded edges used to indicate that more 2684 * content in this view is visible. 2685 * 2686 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2687 * faded edges are not enabled for this view. 2688 * @attr ref android.R.styleable#View_fadingEdgeLength 2689 */ 2690 public int getHorizontalFadingEdgeLength() { 2691 if (isHorizontalFadingEdgeEnabled()) { 2692 ScrollabilityCache cache = mScrollCache; 2693 if (cache != null) { 2694 return cache.fadingEdgeLength; 2695 } 2696 } 2697 return 0; 2698 } 2699 2700 /** 2701 * Returns the width of the vertical scrollbar. 2702 * 2703 * @return The width in pixels of the vertical scrollbar or 0 if there 2704 * is no vertical scrollbar. 2705 */ 2706 public int getVerticalScrollbarWidth() { 2707 ScrollabilityCache cache = mScrollCache; 2708 if (cache != null) { 2709 ScrollBarDrawable scrollBar = cache.scrollBar; 2710 if (scrollBar != null) { 2711 int size = scrollBar.getSize(true); 2712 if (size <= 0) { 2713 size = cache.scrollBarSize; 2714 } 2715 return size; 2716 } 2717 return 0; 2718 } 2719 return 0; 2720 } 2721 2722 /** 2723 * Returns the height of the horizontal scrollbar. 2724 * 2725 * @return The height in pixels of the horizontal scrollbar or 0 if 2726 * there is no horizontal scrollbar. 2727 */ 2728 protected int getHorizontalScrollbarHeight() { 2729 ScrollabilityCache cache = mScrollCache; 2730 if (cache != null) { 2731 ScrollBarDrawable scrollBar = cache.scrollBar; 2732 if (scrollBar != null) { 2733 int size = scrollBar.getSize(false); 2734 if (size <= 0) { 2735 size = cache.scrollBarSize; 2736 } 2737 return size; 2738 } 2739 return 0; 2740 } 2741 return 0; 2742 } 2743 2744 /** 2745 * <p> 2746 * Initializes the scrollbars from a given set of styled attributes. This 2747 * method should be called by subclasses that need scrollbars and when an 2748 * instance of these subclasses is created programmatically rather than 2749 * being inflated from XML. This method is automatically called when the XML 2750 * is inflated. 2751 * </p> 2752 * 2753 * @param a the styled attributes set to initialize the scrollbars from 2754 */ 2755 protected void initializeScrollbars(TypedArray a) { 2756 initScrollCache(); 2757 2758 final ScrollabilityCache scrollabilityCache = mScrollCache; 2759 2760 if (scrollabilityCache.scrollBar == null) { 2761 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 2762 } 2763 2764 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 2765 2766 if (!fadeScrollbars) { 2767 scrollabilityCache.state = ScrollabilityCache.ON; 2768 } 2769 scrollabilityCache.fadeScrollBars = fadeScrollbars; 2770 2771 2772 scrollabilityCache.scrollBarFadeDuration = a.getInt( 2773 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 2774 .getScrollBarFadeDuration()); 2775 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 2776 R.styleable.View_scrollbarDefaultDelayBeforeFade, 2777 ViewConfiguration.getScrollDefaultDelay()); 2778 2779 2780 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 2781 com.android.internal.R.styleable.View_scrollbarSize, 2782 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 2783 2784 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 2785 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 2786 2787 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 2788 if (thumb != null) { 2789 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 2790 } 2791 2792 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 2793 false); 2794 if (alwaysDraw) { 2795 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 2796 } 2797 2798 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 2799 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 2800 2801 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 2802 if (thumb != null) { 2803 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 2804 } 2805 2806 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 2807 false); 2808 if (alwaysDraw) { 2809 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 2810 } 2811 2812 // Re-apply user/background padding so that scrollbar(s) get added 2813 recomputePadding(); 2814 } 2815 2816 /** 2817 * <p> 2818 * Initalizes the scrollability cache if necessary. 2819 * </p> 2820 */ 2821 private void initScrollCache() { 2822 if (mScrollCache == null) { 2823 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 2824 } 2825 } 2826 2827 /** 2828 * Set the position of the vertical scroll bar. Should be one of 2829 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 2830 * {@link #SCROLLBAR_POSITION_RIGHT}. 2831 * 2832 * @param position Where the vertical scroll bar should be positioned. 2833 */ 2834 public void setVerticalScrollbarPosition(int position) { 2835 if (mVerticalScrollbarPosition != position) { 2836 mVerticalScrollbarPosition = position; 2837 computeOpaqueFlags(); 2838 recomputePadding(); 2839 } 2840 } 2841 2842 /** 2843 * @return The position where the vertical scroll bar will show, if applicable. 2844 * @see #setVerticalScrollbarPosition(int) 2845 */ 2846 public int getVerticalScrollbarPosition() { 2847 return mVerticalScrollbarPosition; 2848 } 2849 2850 /** 2851 * Register a callback to be invoked when focus of this view changed. 2852 * 2853 * @param l The callback that will run. 2854 */ 2855 public void setOnFocusChangeListener(OnFocusChangeListener l) { 2856 mOnFocusChangeListener = l; 2857 } 2858 2859 /** 2860 * Add a listener that will be called when the bounds of the view change due to 2861 * layout processing. 2862 * 2863 * @param listener The listener that will be called when layout bounds change. 2864 */ 2865 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 2866 if (mOnLayoutChangeListeners == null) { 2867 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 2868 } 2869 mOnLayoutChangeListeners.add(listener); 2870 } 2871 2872 /** 2873 * Remove a listener for layout changes. 2874 * 2875 * @param listener The listener for layout bounds change. 2876 */ 2877 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 2878 if (mOnLayoutChangeListeners == null) { 2879 return; 2880 } 2881 mOnLayoutChangeListeners.remove(listener); 2882 } 2883 2884 /** 2885 * Gets the current list of listeners for layout changes. 2886 */ 2887 public List<OnLayoutChangeListener> getOnLayoutChangeListeners() { 2888 return mOnLayoutChangeListeners; 2889 } 2890 2891 /** 2892 * Returns the focus-change callback registered for this view. 2893 * 2894 * @return The callback, or null if one is not registered. 2895 */ 2896 public OnFocusChangeListener getOnFocusChangeListener() { 2897 return mOnFocusChangeListener; 2898 } 2899 2900 /** 2901 * Register a callback to be invoked when this view is clicked. If this view is not 2902 * clickable, it becomes clickable. 2903 * 2904 * @param l The callback that will run 2905 * 2906 * @see #setClickable(boolean) 2907 */ 2908 public void setOnClickListener(OnClickListener l) { 2909 if (!isClickable()) { 2910 setClickable(true); 2911 } 2912 mOnClickListener = l; 2913 } 2914 2915 /** 2916 * Register a callback to be invoked when this view is clicked and held. If this view is not 2917 * long clickable, it becomes long clickable. 2918 * 2919 * @param l The callback that will run 2920 * 2921 * @see #setLongClickable(boolean) 2922 */ 2923 public void setOnLongClickListener(OnLongClickListener l) { 2924 if (!isLongClickable()) { 2925 setLongClickable(true); 2926 } 2927 mOnLongClickListener = l; 2928 } 2929 2930 /** 2931 * Register a callback to be invoked when the context menu for this view is 2932 * being built. If this view is not long clickable, it becomes long clickable. 2933 * 2934 * @param l The callback that will run 2935 * 2936 */ 2937 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 2938 if (!isLongClickable()) { 2939 setLongClickable(true); 2940 } 2941 mOnCreateContextMenuListener = l; 2942 } 2943 2944 /** 2945 * Call this view's OnClickListener, if it is defined. 2946 * 2947 * @return True there was an assigned OnClickListener that was called, false 2948 * otherwise is returned. 2949 */ 2950 public boolean performClick() { 2951 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 2952 2953 if (mOnClickListener != null) { 2954 playSoundEffect(SoundEffectConstants.CLICK); 2955 mOnClickListener.onClick(this); 2956 return true; 2957 } 2958 2959 return false; 2960 } 2961 2962 /** 2963 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 2964 * OnLongClickListener did not consume the event. 2965 * 2966 * @return True if one of the above receivers consumed the event, false otherwise. 2967 */ 2968 public boolean performLongClick() { 2969 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 2970 2971 boolean handled = false; 2972 if (mOnLongClickListener != null) { 2973 handled = mOnLongClickListener.onLongClick(View.this); 2974 } 2975 if (!handled) { 2976 handled = showContextMenu(); 2977 } 2978 if (handled) { 2979 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 2980 } 2981 return handled; 2982 } 2983 2984 /** 2985 * Bring up the context menu for this view. 2986 * 2987 * @return Whether a context menu was displayed. 2988 */ 2989 public boolean showContextMenu() { 2990 return getParent().showContextMenuForChild(this); 2991 } 2992 2993 /** 2994 * Start an action mode. 2995 * 2996 * @param callback Callback that will control the lifecycle of the action mode 2997 * @return The new action mode if it is started, null otherwise 2998 * 2999 * @see ActionMode 3000 */ 3001 public ActionMode startActionMode(ActionMode.Callback callback) { 3002 return getParent().startActionModeForChild(this, callback); 3003 } 3004 3005 /** 3006 * Register a callback to be invoked when a key is pressed in this view. 3007 * @param l the key listener to attach to this view 3008 */ 3009 public void setOnKeyListener(OnKeyListener l) { 3010 mOnKeyListener = l; 3011 } 3012 3013 /** 3014 * Register a callback to be invoked when a touch event is sent to this view. 3015 * @param l the touch listener to attach to this view 3016 */ 3017 public void setOnTouchListener(OnTouchListener l) { 3018 mOnTouchListener = l; 3019 } 3020 3021 /** 3022 * Register a callback to be invoked when a drag event is sent to this view. 3023 * @param l The drag listener to attach to this view 3024 */ 3025 public void setOnDragListener(OnDragListener l) { 3026 mOnDragListener = l; 3027 } 3028 3029 /** 3030 * Give this view focus. This will cause {@link #onFocusChanged} to be called. 3031 * 3032 * Note: this does not check whether this {@link View} should get focus, it just 3033 * gives it focus no matter what. It should only be called internally by framework 3034 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3035 * 3036 * @param direction values are View.FOCUS_UP, View.FOCUS_DOWN, 3037 * View.FOCUS_LEFT or View.FOCUS_RIGHT. This is the direction which 3038 * focus moved when requestFocus() is called. It may not always 3039 * apply, in which case use the default View.FOCUS_DOWN. 3040 * @param previouslyFocusedRect The rectangle of the view that had focus 3041 * prior in this View's coordinate system. 3042 */ 3043 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3044 if (DBG) { 3045 System.out.println(this + " requestFocus()"); 3046 } 3047 3048 if ((mPrivateFlags & FOCUSED) == 0) { 3049 mPrivateFlags |= FOCUSED; 3050 3051 if (mParent != null) { 3052 mParent.requestChildFocus(this, this); 3053 } 3054 3055 onFocusChanged(true, direction, previouslyFocusedRect); 3056 refreshDrawableState(); 3057 } 3058 } 3059 3060 /** 3061 * Request that a rectangle of this view be visible on the screen, 3062 * scrolling if necessary just enough. 3063 * 3064 * <p>A View should call this if it maintains some notion of which part 3065 * of its content is interesting. For example, a text editing view 3066 * should call this when its cursor moves. 3067 * 3068 * @param rectangle The rectangle. 3069 * @return Whether any parent scrolled. 3070 */ 3071 public boolean requestRectangleOnScreen(Rect rectangle) { 3072 return requestRectangleOnScreen(rectangle, false); 3073 } 3074 3075 /** 3076 * Request that a rectangle of this view be visible on the screen, 3077 * scrolling if necessary just enough. 3078 * 3079 * <p>A View should call this if it maintains some notion of which part 3080 * of its content is interesting. For example, a text editing view 3081 * should call this when its cursor moves. 3082 * 3083 * <p>When <code>immediate</code> is set to true, scrolling will not be 3084 * animated. 3085 * 3086 * @param rectangle The rectangle. 3087 * @param immediate True to forbid animated scrolling, false otherwise 3088 * @return Whether any parent scrolled. 3089 */ 3090 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3091 View child = this; 3092 ViewParent parent = mParent; 3093 boolean scrolled = false; 3094 while (parent != null) { 3095 scrolled |= parent.requestChildRectangleOnScreen(child, 3096 rectangle, immediate); 3097 3098 // offset rect so next call has the rectangle in the 3099 // coordinate system of its direct child. 3100 rectangle.offset(child.getLeft(), child.getTop()); 3101 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3102 3103 if (!(parent instanceof View)) { 3104 break; 3105 } 3106 3107 child = (View) parent; 3108 parent = child.getParent(); 3109 } 3110 return scrolled; 3111 } 3112 3113 /** 3114 * Called when this view wants to give up focus. This will cause 3115 * {@link #onFocusChanged} to be called. 3116 */ 3117 public void clearFocus() { 3118 if (DBG) { 3119 System.out.println(this + " clearFocus()"); 3120 } 3121 3122 if ((mPrivateFlags & FOCUSED) != 0) { 3123 mPrivateFlags &= ~FOCUSED; 3124 3125 if (mParent != null) { 3126 mParent.clearChildFocus(this); 3127 } 3128 3129 onFocusChanged(false, 0, null); 3130 refreshDrawableState(); 3131 } 3132 } 3133 3134 /** 3135 * Called to clear the focus of a view that is about to be removed. 3136 * Doesn't call clearChildFocus, which prevents this view from taking 3137 * focus again before it has been removed from the parent 3138 */ 3139 void clearFocusForRemoval() { 3140 if ((mPrivateFlags & FOCUSED) != 0) { 3141 mPrivateFlags &= ~FOCUSED; 3142 3143 onFocusChanged(false, 0, null); 3144 refreshDrawableState(); 3145 } 3146 } 3147 3148 /** 3149 * Called internally by the view system when a new view is getting focus. 3150 * This is what clears the old focus. 3151 */ 3152 void unFocus() { 3153 if (DBG) { 3154 System.out.println(this + " unFocus()"); 3155 } 3156 3157 if ((mPrivateFlags & FOCUSED) != 0) { 3158 mPrivateFlags &= ~FOCUSED; 3159 3160 onFocusChanged(false, 0, null); 3161 refreshDrawableState(); 3162 } 3163 } 3164 3165 /** 3166 * Returns true if this view has focus iteself, or is the ancestor of the 3167 * view that has focus. 3168 * 3169 * @return True if this view has or contains focus, false otherwise. 3170 */ 3171 @ViewDebug.ExportedProperty(category = "focus") 3172 public boolean hasFocus() { 3173 return (mPrivateFlags & FOCUSED) != 0; 3174 } 3175 3176 /** 3177 * Returns true if this view is focusable or if it contains a reachable View 3178 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3179 * is a View whose parents do not block descendants focus. 3180 * 3181 * Only {@link #VISIBLE} views are considered focusable. 3182 * 3183 * @return True if the view is focusable or if the view contains a focusable 3184 * View, false otherwise. 3185 * 3186 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3187 */ 3188 public boolean hasFocusable() { 3189 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3190 } 3191 3192 /** 3193 * Called by the view system when the focus state of this view changes. 3194 * When the focus change event is caused by directional navigation, direction 3195 * and previouslyFocusedRect provide insight into where the focus is coming from. 3196 * When overriding, be sure to call up through to the super class so that 3197 * the standard focus handling will occur. 3198 * 3199 * @param gainFocus True if the View has focus; false otherwise. 3200 * @param direction The direction focus has moved when requestFocus() 3201 * is called to give this view focus. Values are 3202 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3203 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3204 * It may not always apply, in which case use the default. 3205 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3206 * system, of the previously focused view. If applicable, this will be 3207 * passed in as finer grained information about where the focus is coming 3208 * from (in addition to direction). Will be <code>null</code> otherwise. 3209 */ 3210 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3211 if (gainFocus) { 3212 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3213 } 3214 3215 InputMethodManager imm = InputMethodManager.peekInstance(); 3216 if (!gainFocus) { 3217 if (isPressed()) { 3218 setPressed(false); 3219 } 3220 if (imm != null && mAttachInfo != null 3221 && mAttachInfo.mHasWindowFocus) { 3222 imm.focusOut(this); 3223 } 3224 onFocusLost(); 3225 } else if (imm != null && mAttachInfo != null 3226 && mAttachInfo.mHasWindowFocus) { 3227 imm.focusIn(this); 3228 } 3229 3230 invalidate(); 3231 if (mOnFocusChangeListener != null) { 3232 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3233 } 3234 3235 if (mAttachInfo != null) { 3236 mAttachInfo.mKeyDispatchState.reset(this); 3237 } 3238 } 3239 3240 /** 3241 * {@inheritDoc} 3242 */ 3243 public void sendAccessibilityEvent(int eventType) { 3244 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3245 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3246 } 3247 } 3248 3249 /** 3250 * {@inheritDoc} 3251 */ 3252 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3253 event.setClassName(getClass().getName()); 3254 event.setPackageName(getContext().getPackageName()); 3255 event.setEnabled(isEnabled()); 3256 event.setContentDescription(mContentDescription); 3257 3258 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 3259 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3260 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 3261 event.setItemCount(focusablesTempList.size()); 3262 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3263 focusablesTempList.clear(); 3264 } 3265 3266 dispatchPopulateAccessibilityEvent(event); 3267 3268 AccessibilityManager.getInstance(mContext).sendAccessibilityEvent(event); 3269 } 3270 3271 /** 3272 * Dispatches an {@link AccessibilityEvent} to the {@link View} children 3273 * to be populated. 3274 * 3275 * @param event The event. 3276 * 3277 * @return True if the event population was completed. 3278 */ 3279 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3280 return false; 3281 } 3282 3283 /** 3284 * Gets the {@link View} description. It briefly describes the view and is 3285 * primarily used for accessibility support. Set this property to enable 3286 * better accessibility support for your application. This is especially 3287 * true for views that do not have textual representation (For example, 3288 * ImageButton). 3289 * 3290 * @return The content descriptiopn. 3291 * 3292 * @attr ref android.R.styleable#View_contentDescription 3293 */ 3294 public CharSequence getContentDescription() { 3295 return mContentDescription; 3296 } 3297 3298 /** 3299 * Sets the {@link View} description. It briefly describes the view and is 3300 * primarily used for accessibility support. Set this property to enable 3301 * better accessibility support for your application. This is especially 3302 * true for views that do not have textual representation (For example, 3303 * ImageButton). 3304 * 3305 * @param contentDescription The content description. 3306 * 3307 * @attr ref android.R.styleable#View_contentDescription 3308 */ 3309 public void setContentDescription(CharSequence contentDescription) { 3310 mContentDescription = contentDescription; 3311 } 3312 3313 /** 3314 * Invoked whenever this view loses focus, either by losing window focus or by losing 3315 * focus within its window. This method can be used to clear any state tied to the 3316 * focus. For instance, if a button is held pressed with the trackball and the window 3317 * loses focus, this method can be used to cancel the press. 3318 * 3319 * Subclasses of View overriding this method should always call super.onFocusLost(). 3320 * 3321 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3322 * @see #onWindowFocusChanged(boolean) 3323 * 3324 * @hide pending API council approval 3325 */ 3326 protected void onFocusLost() { 3327 resetPressedState(); 3328 } 3329 3330 private void resetPressedState() { 3331 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3332 return; 3333 } 3334 3335 if (isPressed()) { 3336 setPressed(false); 3337 3338 if (!mHasPerformedLongPress) { 3339 removeLongPressCallback(); 3340 } 3341 } 3342 } 3343 3344 /** 3345 * Returns true if this view has focus 3346 * 3347 * @return True if this view has focus, false otherwise. 3348 */ 3349 @ViewDebug.ExportedProperty(category = "focus") 3350 public boolean isFocused() { 3351 return (mPrivateFlags & FOCUSED) != 0; 3352 } 3353 3354 /** 3355 * Find the view in the hierarchy rooted at this view that currently has 3356 * focus. 3357 * 3358 * @return The view that currently has focus, or null if no focused view can 3359 * be found. 3360 */ 3361 public View findFocus() { 3362 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3363 } 3364 3365 /** 3366 * Change whether this view is one of the set of scrollable containers in 3367 * its window. This will be used to determine whether the window can 3368 * resize or must pan when a soft input area is open -- scrollable 3369 * containers allow the window to use resize mode since the container 3370 * will appropriately shrink. 3371 */ 3372 public void setScrollContainer(boolean isScrollContainer) { 3373 if (isScrollContainer) { 3374 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3375 mAttachInfo.mScrollContainers.add(this); 3376 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3377 } 3378 mPrivateFlags |= SCROLL_CONTAINER; 3379 } else { 3380 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3381 mAttachInfo.mScrollContainers.remove(this); 3382 } 3383 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3384 } 3385 } 3386 3387 /** 3388 * Returns the quality of the drawing cache. 3389 * 3390 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3391 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3392 * 3393 * @see #setDrawingCacheQuality(int) 3394 * @see #setDrawingCacheEnabled(boolean) 3395 * @see #isDrawingCacheEnabled() 3396 * 3397 * @attr ref android.R.styleable#View_drawingCacheQuality 3398 */ 3399 public int getDrawingCacheQuality() { 3400 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3401 } 3402 3403 /** 3404 * Set the drawing cache quality of this view. This value is used only when the 3405 * drawing cache is enabled 3406 * 3407 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3408 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3409 * 3410 * @see #getDrawingCacheQuality() 3411 * @see #setDrawingCacheEnabled(boolean) 3412 * @see #isDrawingCacheEnabled() 3413 * 3414 * @attr ref android.R.styleable#View_drawingCacheQuality 3415 */ 3416 public void setDrawingCacheQuality(int quality) { 3417 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3418 } 3419 3420 /** 3421 * Returns whether the screen should remain on, corresponding to the current 3422 * value of {@link #KEEP_SCREEN_ON}. 3423 * 3424 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3425 * 3426 * @see #setKeepScreenOn(boolean) 3427 * 3428 * @attr ref android.R.styleable#View_keepScreenOn 3429 */ 3430 public boolean getKeepScreenOn() { 3431 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3432 } 3433 3434 /** 3435 * Controls whether the screen should remain on, modifying the 3436 * value of {@link #KEEP_SCREEN_ON}. 3437 * 3438 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3439 * 3440 * @see #getKeepScreenOn() 3441 * 3442 * @attr ref android.R.styleable#View_keepScreenOn 3443 */ 3444 public void setKeepScreenOn(boolean keepScreenOn) { 3445 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3446 } 3447 3448 /** 3449 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3450 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3451 * 3452 * @attr ref android.R.styleable#View_nextFocusLeft 3453 */ 3454 public int getNextFocusLeftId() { 3455 return mNextFocusLeftId; 3456 } 3457 3458 /** 3459 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3460 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 3461 * decide automatically. 3462 * 3463 * @attr ref android.R.styleable#View_nextFocusLeft 3464 */ 3465 public void setNextFocusLeftId(int nextFocusLeftId) { 3466 mNextFocusLeftId = nextFocusLeftId; 3467 } 3468 3469 /** 3470 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3471 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3472 * 3473 * @attr ref android.R.styleable#View_nextFocusRight 3474 */ 3475 public int getNextFocusRightId() { 3476 return mNextFocusRightId; 3477 } 3478 3479 /** 3480 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3481 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 3482 * decide automatically. 3483 * 3484 * @attr ref android.R.styleable#View_nextFocusRight 3485 */ 3486 public void setNextFocusRightId(int nextFocusRightId) { 3487 mNextFocusRightId = nextFocusRightId; 3488 } 3489 3490 /** 3491 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3492 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3493 * 3494 * @attr ref android.R.styleable#View_nextFocusUp 3495 */ 3496 public int getNextFocusUpId() { 3497 return mNextFocusUpId; 3498 } 3499 3500 /** 3501 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3502 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 3503 * decide automatically. 3504 * 3505 * @attr ref android.R.styleable#View_nextFocusUp 3506 */ 3507 public void setNextFocusUpId(int nextFocusUpId) { 3508 mNextFocusUpId = nextFocusUpId; 3509 } 3510 3511 /** 3512 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3513 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3514 * 3515 * @attr ref android.R.styleable#View_nextFocusDown 3516 */ 3517 public int getNextFocusDownId() { 3518 return mNextFocusDownId; 3519 } 3520 3521 /** 3522 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3523 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 3524 * decide automatically. 3525 * 3526 * @attr ref android.R.styleable#View_nextFocusDown 3527 */ 3528 public void setNextFocusDownId(int nextFocusDownId) { 3529 mNextFocusDownId = nextFocusDownId; 3530 } 3531 3532 /** 3533 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3534 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3535 * 3536 * @attr ref android.R.styleable#View_nextFocusForward 3537 */ 3538 public int getNextFocusForwardId() { 3539 return mNextFocusForwardId; 3540 } 3541 3542 /** 3543 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3544 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 3545 * decide automatically. 3546 * 3547 * @attr ref android.R.styleable#View_nextFocusForward 3548 */ 3549 public void setNextFocusForwardId(int nextFocusForwardId) { 3550 mNextFocusForwardId = nextFocusForwardId; 3551 } 3552 3553 /** 3554 * Returns the visibility of this view and all of its ancestors 3555 * 3556 * @return True if this view and all of its ancestors are {@link #VISIBLE} 3557 */ 3558 public boolean isShown() { 3559 View current = this; 3560 //noinspection ConstantConditions 3561 do { 3562 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3563 return false; 3564 } 3565 ViewParent parent = current.mParent; 3566 if (parent == null) { 3567 return false; // We are not attached to the view root 3568 } 3569 if (!(parent instanceof View)) { 3570 return true; 3571 } 3572 current = (View) parent; 3573 } while (current != null); 3574 3575 return false; 3576 } 3577 3578 /** 3579 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 3580 * is set 3581 * 3582 * @param insets Insets for system windows 3583 * 3584 * @return True if this view applied the insets, false otherwise 3585 */ 3586 protected boolean fitSystemWindows(Rect insets) { 3587 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 3588 mPaddingLeft = insets.left; 3589 mPaddingTop = insets.top; 3590 mPaddingRight = insets.right; 3591 mPaddingBottom = insets.bottom; 3592 requestLayout(); 3593 return true; 3594 } 3595 return false; 3596 } 3597 3598 /** 3599 * Determine if this view has the FITS_SYSTEM_WINDOWS flag set. 3600 * @return True if window has FITS_SYSTEM_WINDOWS set 3601 * 3602 * @hide 3603 */ 3604 public boolean isFitsSystemWindowsFlagSet() { 3605 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 3606 } 3607 3608 /** 3609 * Returns the visibility status for this view. 3610 * 3611 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3612 * @attr ref android.R.styleable#View_visibility 3613 */ 3614 @ViewDebug.ExportedProperty(mapping = { 3615 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 3616 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 3617 @ViewDebug.IntToString(from = GONE, to = "GONE") 3618 }) 3619 public int getVisibility() { 3620 return mViewFlags & VISIBILITY_MASK; 3621 } 3622 3623 /** 3624 * Set the enabled state of this view. 3625 * 3626 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3627 * @attr ref android.R.styleable#View_visibility 3628 */ 3629 @RemotableViewMethod 3630 public void setVisibility(int visibility) { 3631 setFlags(visibility, VISIBILITY_MASK); 3632 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 3633 } 3634 3635 /** 3636 * Returns the enabled status for this view. The interpretation of the 3637 * enabled state varies by subclass. 3638 * 3639 * @return True if this view is enabled, false otherwise. 3640 */ 3641 @ViewDebug.ExportedProperty 3642 public boolean isEnabled() { 3643 return (mViewFlags & ENABLED_MASK) == ENABLED; 3644 } 3645 3646 /** 3647 * Set the enabled state of this view. The interpretation of the enabled 3648 * state varies by subclass. 3649 * 3650 * @param enabled True if this view is enabled, false otherwise. 3651 */ 3652 @RemotableViewMethod 3653 public void setEnabled(boolean enabled) { 3654 if (enabled == isEnabled()) return; 3655 3656 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 3657 3658 /* 3659 * The View most likely has to change its appearance, so refresh 3660 * the drawable state. 3661 */ 3662 refreshDrawableState(); 3663 3664 // Invalidate too, since the default behavior for views is to be 3665 // be drawn at 50% alpha rather than to change the drawable. 3666 invalidate(); 3667 } 3668 3669 /** 3670 * Set whether this view can receive the focus. 3671 * 3672 * Setting this to false will also ensure that this view is not focusable 3673 * in touch mode. 3674 * 3675 * @param focusable If true, this view can receive the focus. 3676 * 3677 * @see #setFocusableInTouchMode(boolean) 3678 * @attr ref android.R.styleable#View_focusable 3679 */ 3680 public void setFocusable(boolean focusable) { 3681 if (!focusable) { 3682 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 3683 } 3684 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 3685 } 3686 3687 /** 3688 * Set whether this view can receive focus while in touch mode. 3689 * 3690 * Setting this to true will also ensure that this view is focusable. 3691 * 3692 * @param focusableInTouchMode If true, this view can receive the focus while 3693 * in touch mode. 3694 * 3695 * @see #setFocusable(boolean) 3696 * @attr ref android.R.styleable#View_focusableInTouchMode 3697 */ 3698 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 3699 // Focusable in touch mode should always be set before the focusable flag 3700 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 3701 // which, in touch mode, will not successfully request focus on this view 3702 // because the focusable in touch mode flag is not set 3703 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 3704 if (focusableInTouchMode) { 3705 setFlags(FOCUSABLE, FOCUSABLE_MASK); 3706 } 3707 } 3708 3709 /** 3710 * Set whether this view should have sound effects enabled for events such as 3711 * clicking and touching. 3712 * 3713 * <p>You may wish to disable sound effects for a view if you already play sounds, 3714 * for instance, a dial key that plays dtmf tones. 3715 * 3716 * @param soundEffectsEnabled whether sound effects are enabled for this view. 3717 * @see #isSoundEffectsEnabled() 3718 * @see #playSoundEffect(int) 3719 * @attr ref android.R.styleable#View_soundEffectsEnabled 3720 */ 3721 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 3722 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 3723 } 3724 3725 /** 3726 * @return whether this view should have sound effects enabled for events such as 3727 * clicking and touching. 3728 * 3729 * @see #setSoundEffectsEnabled(boolean) 3730 * @see #playSoundEffect(int) 3731 * @attr ref android.R.styleable#View_soundEffectsEnabled 3732 */ 3733 @ViewDebug.ExportedProperty 3734 public boolean isSoundEffectsEnabled() { 3735 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 3736 } 3737 3738 /** 3739 * Set whether this view should have haptic feedback for events such as 3740 * long presses. 3741 * 3742 * <p>You may wish to disable haptic feedback if your view already controls 3743 * its own haptic feedback. 3744 * 3745 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 3746 * @see #isHapticFeedbackEnabled() 3747 * @see #performHapticFeedback(int) 3748 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3749 */ 3750 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 3751 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 3752 } 3753 3754 /** 3755 * @return whether this view should have haptic feedback enabled for events 3756 * long presses. 3757 * 3758 * @see #setHapticFeedbackEnabled(boolean) 3759 * @see #performHapticFeedback(int) 3760 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3761 */ 3762 @ViewDebug.ExportedProperty 3763 public boolean isHapticFeedbackEnabled() { 3764 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 3765 } 3766 3767 /** 3768 * If this view doesn't do any drawing on its own, set this flag to 3769 * allow further optimizations. By default, this flag is not set on 3770 * View, but could be set on some View subclasses such as ViewGroup. 3771 * 3772 * Typically, if you override {@link #onDraw} you should clear this flag. 3773 * 3774 * @param willNotDraw whether or not this View draw on its own 3775 */ 3776 public void setWillNotDraw(boolean willNotDraw) { 3777 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 3778 } 3779 3780 /** 3781 * Returns whether or not this View draws on its own. 3782 * 3783 * @return true if this view has nothing to draw, false otherwise 3784 */ 3785 @ViewDebug.ExportedProperty(category = "drawing") 3786 public boolean willNotDraw() { 3787 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 3788 } 3789 3790 /** 3791 * When a View's drawing cache is enabled, drawing is redirected to an 3792 * offscreen bitmap. Some views, like an ImageView, must be able to 3793 * bypass this mechanism if they already draw a single bitmap, to avoid 3794 * unnecessary usage of the memory. 3795 * 3796 * @param willNotCacheDrawing true if this view does not cache its 3797 * drawing, false otherwise 3798 */ 3799 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 3800 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 3801 } 3802 3803 /** 3804 * Returns whether or not this View can cache its drawing or not. 3805 * 3806 * @return true if this view does not cache its drawing, false otherwise 3807 */ 3808 @ViewDebug.ExportedProperty(category = "drawing") 3809 public boolean willNotCacheDrawing() { 3810 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 3811 } 3812 3813 /** 3814 * Indicates whether this view reacts to click events or not. 3815 * 3816 * @return true if the view is clickable, false otherwise 3817 * 3818 * @see #setClickable(boolean) 3819 * @attr ref android.R.styleable#View_clickable 3820 */ 3821 @ViewDebug.ExportedProperty 3822 public boolean isClickable() { 3823 return (mViewFlags & CLICKABLE) == CLICKABLE; 3824 } 3825 3826 /** 3827 * Enables or disables click events for this view. When a view 3828 * is clickable it will change its state to "pressed" on every click. 3829 * Subclasses should set the view clickable to visually react to 3830 * user's clicks. 3831 * 3832 * @param clickable true to make the view clickable, false otherwise 3833 * 3834 * @see #isClickable() 3835 * @attr ref android.R.styleable#View_clickable 3836 */ 3837 public void setClickable(boolean clickable) { 3838 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 3839 } 3840 3841 /** 3842 * Indicates whether this view reacts to long click events or not. 3843 * 3844 * @return true if the view is long clickable, false otherwise 3845 * 3846 * @see #setLongClickable(boolean) 3847 * @attr ref android.R.styleable#View_longClickable 3848 */ 3849 public boolean isLongClickable() { 3850 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 3851 } 3852 3853 /** 3854 * Enables or disables long click events for this view. When a view is long 3855 * clickable it reacts to the user holding down the button for a longer 3856 * duration than a tap. This event can either launch the listener or a 3857 * context menu. 3858 * 3859 * @param longClickable true to make the view long clickable, false otherwise 3860 * @see #isLongClickable() 3861 * @attr ref android.R.styleable#View_longClickable 3862 */ 3863 public void setLongClickable(boolean longClickable) { 3864 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 3865 } 3866 3867 /** 3868 * Sets the pressed state for this view. 3869 * 3870 * @see #isClickable() 3871 * @see #setClickable(boolean) 3872 * 3873 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 3874 * the View's internal state from a previously set "pressed" state. 3875 */ 3876 public void setPressed(boolean pressed) { 3877 if (pressed) { 3878 mPrivateFlags |= PRESSED; 3879 } else { 3880 mPrivateFlags &= ~PRESSED; 3881 } 3882 refreshDrawableState(); 3883 dispatchSetPressed(pressed); 3884 } 3885 3886 /** 3887 * Dispatch setPressed to all of this View's children. 3888 * 3889 * @see #setPressed(boolean) 3890 * 3891 * @param pressed The new pressed state 3892 */ 3893 protected void dispatchSetPressed(boolean pressed) { 3894 } 3895 3896 /** 3897 * Indicates whether the view is currently in pressed state. Unless 3898 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 3899 * the pressed state. 3900 * 3901 * @see #setPressed 3902 * @see #isClickable() 3903 * @see #setClickable(boolean) 3904 * 3905 * @return true if the view is currently pressed, false otherwise 3906 */ 3907 public boolean isPressed() { 3908 return (mPrivateFlags & PRESSED) == PRESSED; 3909 } 3910 3911 /** 3912 * Indicates whether this view will save its state (that is, 3913 * whether its {@link #onSaveInstanceState} method will be called). 3914 * 3915 * @return Returns true if the view state saving is enabled, else false. 3916 * 3917 * @see #setSaveEnabled(boolean) 3918 * @attr ref android.R.styleable#View_saveEnabled 3919 */ 3920 public boolean isSaveEnabled() { 3921 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 3922 } 3923 3924 /** 3925 * Controls whether the saving of this view's state is 3926 * enabled (that is, whether its {@link #onSaveInstanceState} method 3927 * will be called). Note that even if freezing is enabled, the 3928 * view still must have an id assigned to it (via {@link #setId setId()}) 3929 * for its state to be saved. This flag can only disable the 3930 * saving of this view; any child views may still have their state saved. 3931 * 3932 * @param enabled Set to false to <em>disable</em> state saving, or true 3933 * (the default) to allow it. 3934 * 3935 * @see #isSaveEnabled() 3936 * @see #setId(int) 3937 * @see #onSaveInstanceState() 3938 * @attr ref android.R.styleable#View_saveEnabled 3939 */ 3940 public void setSaveEnabled(boolean enabled) { 3941 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 3942 } 3943 3944 /** 3945 * Gets whether the framework should discard touches when the view's 3946 * window is obscured by another visible window. 3947 * Refer to the {@link View} security documentation for more details. 3948 * 3949 * @return True if touch filtering is enabled. 3950 * 3951 * @see #setFilterTouchesWhenObscured(boolean) 3952 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3953 */ 3954 @ViewDebug.ExportedProperty 3955 public boolean getFilterTouchesWhenObscured() { 3956 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 3957 } 3958 3959 /** 3960 * Sets whether the framework should discard touches when the view's 3961 * window is obscured by another visible window. 3962 * Refer to the {@link View} security documentation for more details. 3963 * 3964 * @param enabled True if touch filtering should be enabled. 3965 * 3966 * @see #getFilterTouchesWhenObscured 3967 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3968 */ 3969 public void setFilterTouchesWhenObscured(boolean enabled) { 3970 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 3971 FILTER_TOUCHES_WHEN_OBSCURED); 3972 } 3973 3974 /** 3975 * Indicates whether the entire hierarchy under this view will save its 3976 * state when a state saving traversal occurs from its parent. The default 3977 * is true; if false, these views will not be saved unless 3978 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 3979 * 3980 * @return Returns true if the view state saving from parent is enabled, else false. 3981 * 3982 * @see #setSaveFromParentEnabled(boolean) 3983 */ 3984 public boolean isSaveFromParentEnabled() { 3985 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 3986 } 3987 3988 /** 3989 * Controls whether the entire hierarchy under this view will save its 3990 * state when a state saving traversal occurs from its parent. The default 3991 * is true; if false, these views will not be saved unless 3992 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 3993 * 3994 * @param enabled Set to false to <em>disable</em> state saving, or true 3995 * (the default) to allow it. 3996 * 3997 * @see #isSaveFromParentEnabled() 3998 * @see #setId(int) 3999 * @see #onSaveInstanceState() 4000 */ 4001 public void setSaveFromParentEnabled(boolean enabled) { 4002 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4003 } 4004 4005 4006 /** 4007 * Returns whether this View is able to take focus. 4008 * 4009 * @return True if this view can take focus, or false otherwise. 4010 * @attr ref android.R.styleable#View_focusable 4011 */ 4012 @ViewDebug.ExportedProperty(category = "focus") 4013 public final boolean isFocusable() { 4014 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4015 } 4016 4017 /** 4018 * When a view is focusable, it may not want to take focus when in touch mode. 4019 * For example, a button would like focus when the user is navigating via a D-pad 4020 * so that the user can click on it, but once the user starts touching the screen, 4021 * the button shouldn't take focus 4022 * @return Whether the view is focusable in touch mode. 4023 * @attr ref android.R.styleable#View_focusableInTouchMode 4024 */ 4025 @ViewDebug.ExportedProperty 4026 public final boolean isFocusableInTouchMode() { 4027 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4028 } 4029 4030 /** 4031 * Find the nearest view in the specified direction that can take focus. 4032 * This does not actually give focus to that view. 4033 * 4034 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4035 * 4036 * @return The nearest focusable in the specified direction, or null if none 4037 * can be found. 4038 */ 4039 public View focusSearch(int direction) { 4040 if (mParent != null) { 4041 return mParent.focusSearch(this, direction); 4042 } else { 4043 return null; 4044 } 4045 } 4046 4047 /** 4048 * This method is the last chance for the focused view and its ancestors to 4049 * respond to an arrow key. This is called when the focused view did not 4050 * consume the key internally, nor could the view system find a new view in 4051 * the requested direction to give focus to. 4052 * 4053 * @param focused The currently focused view. 4054 * @param direction The direction focus wants to move. One of FOCUS_UP, 4055 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4056 * @return True if the this view consumed this unhandled move. 4057 */ 4058 public boolean dispatchUnhandledMove(View focused, int direction) { 4059 return false; 4060 } 4061 4062 /** 4063 * If a user manually specified the next view id for a particular direction, 4064 * use the root to look up the view. 4065 * @param root The root view of the hierarchy containing this view. 4066 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4067 * or FOCUS_BACKWARD. 4068 * @return The user specified next view, or null if there is none. 4069 */ 4070 View findUserSetNextFocus(View root, int direction) { 4071 switch (direction) { 4072 case FOCUS_LEFT: 4073 if (mNextFocusLeftId == View.NO_ID) return null; 4074 return findViewShouldExist(root, mNextFocusLeftId); 4075 case FOCUS_RIGHT: 4076 if (mNextFocusRightId == View.NO_ID) return null; 4077 return findViewShouldExist(root, mNextFocusRightId); 4078 case FOCUS_UP: 4079 if (mNextFocusUpId == View.NO_ID) return null; 4080 return findViewShouldExist(root, mNextFocusUpId); 4081 case FOCUS_DOWN: 4082 if (mNextFocusDownId == View.NO_ID) return null; 4083 return findViewShouldExist(root, mNextFocusDownId); 4084 case FOCUS_FORWARD: 4085 if (mNextFocusForwardId == View.NO_ID) return null; 4086 return findViewShouldExist(root, mNextFocusForwardId); 4087 case FOCUS_BACKWARD: { 4088 final int id = mID; 4089 return root.findViewByPredicate(new Predicate<View>() { 4090 @Override 4091 public boolean apply(View t) { 4092 return t.mNextFocusForwardId == id; 4093 } 4094 }); 4095 } 4096 } 4097 return null; 4098 } 4099 4100 private static View findViewShouldExist(View root, int childViewId) { 4101 View result = root.findViewById(childViewId); 4102 if (result == null) { 4103 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4104 + "by user for id " + childViewId); 4105 } 4106 return result; 4107 } 4108 4109 /** 4110 * Find and return all focusable views that are descendants of this view, 4111 * possibly including this view if it is focusable itself. 4112 * 4113 * @param direction The direction of the focus 4114 * @return A list of focusable views 4115 */ 4116 public ArrayList<View> getFocusables(int direction) { 4117 ArrayList<View> result = new ArrayList<View>(24); 4118 addFocusables(result, direction); 4119 return result; 4120 } 4121 4122 /** 4123 * Add any focusable views that are descendants of this view (possibly 4124 * including this view if it is focusable itself) to views. If we are in touch mode, 4125 * only add views that are also focusable in touch mode. 4126 * 4127 * @param views Focusable views found so far 4128 * @param direction The direction of the focus 4129 */ 4130 public void addFocusables(ArrayList<View> views, int direction) { 4131 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4132 } 4133 4134 /** 4135 * Adds any focusable views that are descendants of this view (possibly 4136 * including this view if it is focusable itself) to views. This method 4137 * adds all focusable views regardless if we are in touch mode or 4138 * only views focusable in touch mode if we are in touch mode depending on 4139 * the focusable mode paramater. 4140 * 4141 * @param views Focusable views found so far or null if all we are interested is 4142 * the number of focusables. 4143 * @param direction The direction of the focus. 4144 * @param focusableMode The type of focusables to be added. 4145 * 4146 * @see #FOCUSABLES_ALL 4147 * @see #FOCUSABLES_TOUCH_MODE 4148 */ 4149 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4150 if (!isFocusable()) { 4151 return; 4152 } 4153 4154 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4155 isInTouchMode() && !isFocusableInTouchMode()) { 4156 return; 4157 } 4158 4159 if (views != null) { 4160 views.add(this); 4161 } 4162 } 4163 4164 /** 4165 * Find and return all touchable views that are descendants of this view, 4166 * possibly including this view if it is touchable itself. 4167 * 4168 * @return A list of touchable views 4169 */ 4170 public ArrayList<View> getTouchables() { 4171 ArrayList<View> result = new ArrayList<View>(); 4172 addTouchables(result); 4173 return result; 4174 } 4175 4176 /** 4177 * Add any touchable views that are descendants of this view (possibly 4178 * including this view if it is touchable itself) to views. 4179 * 4180 * @param views Touchable views found so far 4181 */ 4182 public void addTouchables(ArrayList<View> views) { 4183 final int viewFlags = mViewFlags; 4184 4185 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 4186 && (viewFlags & ENABLED_MASK) == ENABLED) { 4187 views.add(this); 4188 } 4189 } 4190 4191 /** 4192 * Call this to try to give focus to a specific view or to one of its 4193 * descendants. 4194 * 4195 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4196 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4197 * while the device is in touch mode. 4198 * 4199 * See also {@link #focusSearch}, which is what you call to say that you 4200 * have focus, and you want your parent to look for the next one. 4201 * 4202 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 4203 * {@link #FOCUS_DOWN} and <code>null</code>. 4204 * 4205 * @return Whether this view or one of its descendants actually took focus. 4206 */ 4207 public final boolean requestFocus() { 4208 return requestFocus(View.FOCUS_DOWN); 4209 } 4210 4211 4212 /** 4213 * Call this to try to give focus to a specific view or to one of its 4214 * descendants and give it a hint about what direction focus is heading. 4215 * 4216 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4217 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4218 * while the device is in touch mode. 4219 * 4220 * See also {@link #focusSearch}, which is what you call to say that you 4221 * have focus, and you want your parent to look for the next one. 4222 * 4223 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 4224 * <code>null</code> set for the previously focused rectangle. 4225 * 4226 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4227 * @return Whether this view or one of its descendants actually took focus. 4228 */ 4229 public final boolean requestFocus(int direction) { 4230 return requestFocus(direction, null); 4231 } 4232 4233 /** 4234 * Call this to try to give focus to a specific view or to one of its descendants 4235 * and give it hints about the direction and a specific rectangle that the focus 4236 * is coming from. The rectangle can help give larger views a finer grained hint 4237 * about where focus is coming from, and therefore, where to show selection, or 4238 * forward focus change internally. 4239 * 4240 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4241 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4242 * while the device is in touch mode. 4243 * 4244 * A View will not take focus if it is not visible. 4245 * 4246 * A View will not take focus if one of its parents has {@link android.view.ViewGroup#getDescendantFocusability()} 4247 * equal to {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 4248 * 4249 * See also {@link #focusSearch}, which is what you call to say that you 4250 * have focus, and you want your parent to look for the next one. 4251 * 4252 * You may wish to override this method if your custom {@link View} has an internal 4253 * {@link View} that it wishes to forward the request to. 4254 * 4255 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4256 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 4257 * to give a finer grained hint about where focus is coming from. May be null 4258 * if there is no hint. 4259 * @return Whether this view or one of its descendants actually took focus. 4260 */ 4261 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 4262 // need to be focusable 4263 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 4264 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4265 return false; 4266 } 4267 4268 // need to be focusable in touch mode if in touch mode 4269 if (isInTouchMode() && 4270 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 4271 return false; 4272 } 4273 4274 // need to not have any parents blocking us 4275 if (hasAncestorThatBlocksDescendantFocus()) { 4276 return false; 4277 } 4278 4279 handleFocusGainInternal(direction, previouslyFocusedRect); 4280 return true; 4281 } 4282 4283 /** Gets the ViewRoot, or null if not attached. */ 4284 /*package*/ ViewRoot getViewRoot() { 4285 View root = getRootView(); 4286 return root != null ? (ViewRoot)root.getParent() : null; 4287 } 4288 4289 /** 4290 * Call this to try to give focus to a specific view or to one of its descendants. This is a 4291 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 4292 * touch mode to request focus when they are touched. 4293 * 4294 * @return Whether this view or one of its descendants actually took focus. 4295 * 4296 * @see #isInTouchMode() 4297 * 4298 */ 4299 public final boolean requestFocusFromTouch() { 4300 // Leave touch mode if we need to 4301 if (isInTouchMode()) { 4302 ViewRoot viewRoot = getViewRoot(); 4303 if (viewRoot != null) { 4304 viewRoot.ensureTouchMode(false); 4305 } 4306 } 4307 return requestFocus(View.FOCUS_DOWN); 4308 } 4309 4310 /** 4311 * @return Whether any ancestor of this view blocks descendant focus. 4312 */ 4313 private boolean hasAncestorThatBlocksDescendantFocus() { 4314 ViewParent ancestor = mParent; 4315 while (ancestor instanceof ViewGroup) { 4316 final ViewGroup vgAncestor = (ViewGroup) ancestor; 4317 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 4318 return true; 4319 } else { 4320 ancestor = vgAncestor.getParent(); 4321 } 4322 } 4323 return false; 4324 } 4325 4326 /** 4327 * @hide 4328 */ 4329 public void dispatchStartTemporaryDetach() { 4330 onStartTemporaryDetach(); 4331 } 4332 4333 /** 4334 * This is called when a container is going to temporarily detach a child, with 4335 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4336 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4337 * {@link #onDetachedFromWindow()} when the container is done. 4338 */ 4339 public void onStartTemporaryDetach() { 4340 removeUnsetPressCallback(); 4341 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4342 } 4343 4344 /** 4345 * @hide 4346 */ 4347 public void dispatchFinishTemporaryDetach() { 4348 onFinishTemporaryDetach(); 4349 } 4350 4351 /** 4352 * Called after {@link #onStartTemporaryDetach} when the container is done 4353 * changing the view. 4354 */ 4355 public void onFinishTemporaryDetach() { 4356 } 4357 4358 /** 4359 * capture information of this view for later analysis: developement only 4360 * check dynamic switch to make sure we only dump view 4361 * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set 4362 */ 4363 private static void captureViewInfo(String subTag, View v) { 4364 if (v == null || SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) { 4365 return; 4366 } 4367 ViewDebug.dumpCapturedView(subTag, v); 4368 } 4369 4370 /** 4371 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4372 * for this view's window. Returns null if the view is not currently attached 4373 * to the window. Normally you will not need to use this directly, but 4374 * just use the standard high-level event callbacks like {@link #onKeyDown}. 4375 */ 4376 public KeyEvent.DispatcherState getKeyDispatcherState() { 4377 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4378 } 4379 4380 /** 4381 * Dispatch a key event before it is processed by any input method 4382 * associated with the view hierarchy. This can be used to intercept 4383 * key events in special situations before the IME consumes them; a 4384 * typical example would be handling the BACK key to update the application's 4385 * UI instead of allowing the IME to see it and close itself. 4386 * 4387 * @param event The key event to be dispatched. 4388 * @return True if the event was handled, false otherwise. 4389 */ 4390 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4391 return onKeyPreIme(event.getKeyCode(), event); 4392 } 4393 4394 /** 4395 * Dispatch a key event to the next view on the focus path. This path runs 4396 * from the top of the view tree down to the currently focused view. If this 4397 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4398 * the next node down the focus path. This method also fires any key 4399 * listeners. 4400 * 4401 * @param event The key event to be dispatched. 4402 * @return True if the event was handled, false otherwise. 4403 */ 4404 public boolean dispatchKeyEvent(KeyEvent event) { 4405 // If any attached key listener a first crack at the event. 4406 4407 //noinspection SimplifiableIfStatement,deprecation 4408 if (android.util.Config.LOGV) { 4409 captureViewInfo("captureViewKeyEvent", this); 4410 } 4411 4412 //noinspection SimplifiableIfStatement 4413 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4414 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4415 return true; 4416 } 4417 4418 return event.dispatch(this, mAttachInfo != null 4419 ? mAttachInfo.mKeyDispatchState : null, this); 4420 } 4421 4422 /** 4423 * Dispatches a key shortcut event. 4424 * 4425 * @param event The key event to be dispatched. 4426 * @return True if the event was handled by the view, false otherwise. 4427 */ 4428 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 4429 return onKeyShortcut(event.getKeyCode(), event); 4430 } 4431 4432 /** 4433 * Pass the touch screen motion event down to the target view, or this 4434 * view if it is the target. 4435 * 4436 * @param event The motion event to be dispatched. 4437 * @return True if the event was handled by the view, false otherwise. 4438 */ 4439 public boolean dispatchTouchEvent(MotionEvent event) { 4440 if (!onFilterTouchEventForSecurity(event)) { 4441 return false; 4442 } 4443 4444 //noinspection SimplifiableIfStatement 4445 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 4446 mOnTouchListener.onTouch(this, event)) { 4447 return true; 4448 } 4449 return onTouchEvent(event); 4450 } 4451 4452 /** 4453 * Filter the touch event to apply security policies. 4454 * 4455 * @param event The motion event to be filtered. 4456 * @return True if the event should be dispatched, false if the event should be dropped. 4457 * 4458 * @see #getFilterTouchesWhenObscured 4459 */ 4460 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 4461 //noinspection RedundantIfStatement 4462 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 4463 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 4464 // Window is obscured, drop this touch. 4465 return false; 4466 } 4467 return true; 4468 } 4469 4470 /** 4471 * Pass a trackball motion event down to the focused view. 4472 * 4473 * @param event The motion event to be dispatched. 4474 * @return True if the event was handled by the view, false otherwise. 4475 */ 4476 public boolean dispatchTrackballEvent(MotionEvent event) { 4477 //Log.i("view", "view=" + this + ", " + event.toString()); 4478 return onTrackballEvent(event); 4479 } 4480 4481 /** 4482 * Called when the window containing this view gains or loses window focus. 4483 * ViewGroups should override to route to their children. 4484 * 4485 * @param hasFocus True if the window containing this view now has focus, 4486 * false otherwise. 4487 */ 4488 public void dispatchWindowFocusChanged(boolean hasFocus) { 4489 onWindowFocusChanged(hasFocus); 4490 } 4491 4492 /** 4493 * Called when the window containing this view gains or loses focus. Note 4494 * that this is separate from view focus: to receive key events, both 4495 * your view and its window must have focus. If a window is displayed 4496 * on top of yours that takes input focus, then your own window will lose 4497 * focus but the view focus will remain unchanged. 4498 * 4499 * @param hasWindowFocus True if the window containing this view now has 4500 * focus, false otherwise. 4501 */ 4502 public void onWindowFocusChanged(boolean hasWindowFocus) { 4503 InputMethodManager imm = InputMethodManager.peekInstance(); 4504 if (!hasWindowFocus) { 4505 if (isPressed()) { 4506 setPressed(false); 4507 } 4508 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4509 imm.focusOut(this); 4510 } 4511 removeLongPressCallback(); 4512 removeTapCallback(); 4513 onFocusLost(); 4514 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4515 imm.focusIn(this); 4516 } 4517 refreshDrawableState(); 4518 } 4519 4520 /** 4521 * Returns true if this view is in a window that currently has window focus. 4522 * Note that this is not the same as the view itself having focus. 4523 * 4524 * @return True if this view is in a window that currently has window focus. 4525 */ 4526 public boolean hasWindowFocus() { 4527 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 4528 } 4529 4530 /** 4531 * Dispatch a view visibility change down the view hierarchy. 4532 * ViewGroups should override to route to their children. 4533 * @param changedView The view whose visibility changed. Could be 'this' or 4534 * an ancestor view. 4535 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4536 * {@link #INVISIBLE} or {@link #GONE}. 4537 */ 4538 protected void dispatchVisibilityChanged(View changedView, int visibility) { 4539 onVisibilityChanged(changedView, visibility); 4540 } 4541 4542 /** 4543 * Called when the visibility of the view or an ancestor of the view is changed. 4544 * @param changedView The view whose visibility changed. Could be 'this' or 4545 * an ancestor view. 4546 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4547 * {@link #INVISIBLE} or {@link #GONE}. 4548 */ 4549 protected void onVisibilityChanged(View changedView, int visibility) { 4550 if (visibility == VISIBLE) { 4551 if (mAttachInfo != null) { 4552 initialAwakenScrollBars(); 4553 } else { 4554 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 4555 } 4556 } 4557 } 4558 4559 /** 4560 * Dispatch a hint about whether this view is displayed. For instance, when 4561 * a View moves out of the screen, it might receives a display hint indicating 4562 * the view is not displayed. Applications should not <em>rely</em> on this hint 4563 * as there is no guarantee that they will receive one. 4564 * 4565 * @param hint A hint about whether or not this view is displayed: 4566 * {@link #VISIBLE} or {@link #INVISIBLE}. 4567 */ 4568 public void dispatchDisplayHint(int hint) { 4569 onDisplayHint(hint); 4570 } 4571 4572 /** 4573 * Gives this view a hint about whether is displayed or not. For instance, when 4574 * a View moves out of the screen, it might receives a display hint indicating 4575 * the view is not displayed. Applications should not <em>rely</em> on this hint 4576 * as there is no guarantee that they will receive one. 4577 * 4578 * @param hint A hint about whether or not this view is displayed: 4579 * {@link #VISIBLE} or {@link #INVISIBLE}. 4580 */ 4581 protected void onDisplayHint(int hint) { 4582 } 4583 4584 /** 4585 * Dispatch a window visibility change down the view hierarchy. 4586 * ViewGroups should override to route to their children. 4587 * 4588 * @param visibility The new visibility of the window. 4589 * 4590 * @see #onWindowVisibilityChanged 4591 */ 4592 public void dispatchWindowVisibilityChanged(int visibility) { 4593 onWindowVisibilityChanged(visibility); 4594 } 4595 4596 /** 4597 * Called when the window containing has change its visibility 4598 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 4599 * that this tells you whether or not your window is being made visible 4600 * to the window manager; this does <em>not</em> tell you whether or not 4601 * your window is obscured by other windows on the screen, even if it 4602 * is itself visible. 4603 * 4604 * @param visibility The new visibility of the window. 4605 */ 4606 protected void onWindowVisibilityChanged(int visibility) { 4607 if (visibility == VISIBLE) { 4608 initialAwakenScrollBars(); 4609 } 4610 } 4611 4612 /** 4613 * Returns the current visibility of the window this view is attached to 4614 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 4615 * 4616 * @return Returns the current visibility of the view's window. 4617 */ 4618 public int getWindowVisibility() { 4619 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 4620 } 4621 4622 /** 4623 * Retrieve the overall visible display size in which the window this view is 4624 * attached to has been positioned in. This takes into account screen 4625 * decorations above the window, for both cases where the window itself 4626 * is being position inside of them or the window is being placed under 4627 * then and covered insets are used for the window to position its content 4628 * inside. In effect, this tells you the available area where content can 4629 * be placed and remain visible to users. 4630 * 4631 * <p>This function requires an IPC back to the window manager to retrieve 4632 * the requested information, so should not be used in performance critical 4633 * code like drawing. 4634 * 4635 * @param outRect Filled in with the visible display frame. If the view 4636 * is not attached to a window, this is simply the raw display size. 4637 */ 4638 public void getWindowVisibleDisplayFrame(Rect outRect) { 4639 if (mAttachInfo != null) { 4640 try { 4641 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 4642 } catch (RemoteException e) { 4643 return; 4644 } 4645 // XXX This is really broken, and probably all needs to be done 4646 // in the window manager, and we need to know more about whether 4647 // we want the area behind or in front of the IME. 4648 final Rect insets = mAttachInfo.mVisibleInsets; 4649 outRect.left += insets.left; 4650 outRect.top += insets.top; 4651 outRect.right -= insets.right; 4652 outRect.bottom -= insets.bottom; 4653 return; 4654 } 4655 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 4656 outRect.set(0, 0, d.getWidth(), d.getHeight()); 4657 } 4658 4659 /** 4660 * Dispatch a notification about a resource configuration change down 4661 * the view hierarchy. 4662 * ViewGroups should override to route to their children. 4663 * 4664 * @param newConfig The new resource configuration. 4665 * 4666 * @see #onConfigurationChanged 4667 */ 4668 public void dispatchConfigurationChanged(Configuration newConfig) { 4669 onConfigurationChanged(newConfig); 4670 } 4671 4672 /** 4673 * Called when the current configuration of the resources being used 4674 * by the application have changed. You can use this to decide when 4675 * to reload resources that can changed based on orientation and other 4676 * configuration characterstics. You only need to use this if you are 4677 * not relying on the normal {@link android.app.Activity} mechanism of 4678 * recreating the activity instance upon a configuration change. 4679 * 4680 * @param newConfig The new resource configuration. 4681 */ 4682 protected void onConfigurationChanged(Configuration newConfig) { 4683 } 4684 4685 /** 4686 * Private function to aggregate all per-view attributes in to the view 4687 * root. 4688 */ 4689 void dispatchCollectViewAttributes(int visibility) { 4690 performCollectViewAttributes(visibility); 4691 } 4692 4693 void performCollectViewAttributes(int visibility) { 4694 //noinspection PointlessBitwiseExpression 4695 if (((visibility | mViewFlags) & (VISIBILITY_MASK | KEEP_SCREEN_ON)) 4696 == (VISIBLE | KEEP_SCREEN_ON)) { 4697 mAttachInfo.mKeepScreenOn = true; 4698 } 4699 } 4700 4701 void needGlobalAttributesUpdate(boolean force) { 4702 AttachInfo ai = mAttachInfo; 4703 if (ai != null) { 4704 if (ai.mKeepScreenOn || force) { 4705 ai.mRecomputeGlobalAttributes = true; 4706 } 4707 } 4708 } 4709 4710 /** 4711 * Returns whether the device is currently in touch mode. Touch mode is entered 4712 * once the user begins interacting with the device by touch, and affects various 4713 * things like whether focus is always visible to the user. 4714 * 4715 * @return Whether the device is in touch mode. 4716 */ 4717 @ViewDebug.ExportedProperty 4718 public boolean isInTouchMode() { 4719 if (mAttachInfo != null) { 4720 return mAttachInfo.mInTouchMode; 4721 } else { 4722 return ViewRoot.isInTouchMode(); 4723 } 4724 } 4725 4726 /** 4727 * Returns the context the view is running in, through which it can 4728 * access the current theme, resources, etc. 4729 * 4730 * @return The view's Context. 4731 */ 4732 @ViewDebug.CapturedViewProperty 4733 public final Context getContext() { 4734 return mContext; 4735 } 4736 4737 /** 4738 * Handle a key event before it is processed by any input method 4739 * associated with the view hierarchy. This can be used to intercept 4740 * key events in special situations before the IME consumes them; a 4741 * typical example would be handling the BACK key to update the application's 4742 * UI instead of allowing the IME to see it and close itself. 4743 * 4744 * @param keyCode The value in event.getKeyCode(). 4745 * @param event Description of the key event. 4746 * @return If you handled the event, return true. If you want to allow the 4747 * event to be handled by the next receiver, return false. 4748 */ 4749 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 4750 return false; 4751 } 4752 4753 /** 4754 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 4755 * KeyEvent.Callback.onKeyDown()}: perform press of the view 4756 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 4757 * is released, if the view is enabled and clickable. 4758 * 4759 * @param keyCode A key code that represents the button pressed, from 4760 * {@link android.view.KeyEvent}. 4761 * @param event The KeyEvent object that defines the button action. 4762 */ 4763 public boolean onKeyDown(int keyCode, KeyEvent event) { 4764 boolean result = false; 4765 4766 switch (keyCode) { 4767 case KeyEvent.KEYCODE_DPAD_CENTER: 4768 case KeyEvent.KEYCODE_ENTER: { 4769 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4770 return true; 4771 } 4772 // Long clickable items don't necessarily have to be clickable 4773 if (((mViewFlags & CLICKABLE) == CLICKABLE || 4774 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 4775 (event.getRepeatCount() == 0)) { 4776 setPressed(true); 4777 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 4778 postCheckForLongClick(0); 4779 } 4780 return true; 4781 } 4782 break; 4783 } 4784 } 4785 return result; 4786 } 4787 4788 /** 4789 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 4790 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 4791 * the event). 4792 */ 4793 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 4794 return false; 4795 } 4796 4797 /** 4798 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 4799 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 4800 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 4801 * {@link KeyEvent#KEYCODE_ENTER} is released. 4802 * 4803 * @param keyCode A key code that represents the button pressed, from 4804 * {@link android.view.KeyEvent}. 4805 * @param event The KeyEvent object that defines the button action. 4806 */ 4807 public boolean onKeyUp(int keyCode, KeyEvent event) { 4808 boolean result = false; 4809 4810 switch (keyCode) { 4811 case KeyEvent.KEYCODE_DPAD_CENTER: 4812 case KeyEvent.KEYCODE_ENTER: { 4813 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4814 return true; 4815 } 4816 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 4817 setPressed(false); 4818 4819 if (!mHasPerformedLongPress) { 4820 // This is a tap, so remove the longpress check 4821 removeLongPressCallback(); 4822 4823 result = performClick(); 4824 } 4825 } 4826 break; 4827 } 4828 } 4829 return result; 4830 } 4831 4832 /** 4833 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 4834 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 4835 * the event). 4836 * 4837 * @param keyCode A key code that represents the button pressed, from 4838 * {@link android.view.KeyEvent}. 4839 * @param repeatCount The number of times the action was made. 4840 * @param event The KeyEvent object that defines the button action. 4841 */ 4842 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 4843 return false; 4844 } 4845 4846 /** 4847 * Called on the focused view when a key shortcut event is not handled. 4848 * Override this method to implement local key shortcuts for the View. 4849 * Key shortcuts can also be implemented by setting the 4850 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 4851 * 4852 * @param keyCode The value in event.getKeyCode(). 4853 * @param event Description of the key event. 4854 * @return If you handled the event, return true. If you want to allow the 4855 * event to be handled by the next receiver, return false. 4856 */ 4857 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 4858 return false; 4859 } 4860 4861 /** 4862 * Check whether the called view is a text editor, in which case it 4863 * would make sense to automatically display a soft input window for 4864 * it. Subclasses should override this if they implement 4865 * {@link #onCreateInputConnection(EditorInfo)} to return true if 4866 * a call on that method would return a non-null InputConnection, and 4867 * they are really a first-class editor that the user would normally 4868 * start typing on when the go into a window containing your view. 4869 * 4870 * <p>The default implementation always returns false. This does 4871 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 4872 * will not be called or the user can not otherwise perform edits on your 4873 * view; it is just a hint to the system that this is not the primary 4874 * purpose of this view. 4875 * 4876 * @return Returns true if this view is a text editor, else false. 4877 */ 4878 public boolean onCheckIsTextEditor() { 4879 return false; 4880 } 4881 4882 /** 4883 * Create a new InputConnection for an InputMethod to interact 4884 * with the view. The default implementation returns null, since it doesn't 4885 * support input methods. You can override this to implement such support. 4886 * This is only needed for views that take focus and text input. 4887 * 4888 * <p>When implementing this, you probably also want to implement 4889 * {@link #onCheckIsTextEditor()} to indicate you will return a 4890 * non-null InputConnection. 4891 * 4892 * @param outAttrs Fill in with attribute information about the connection. 4893 */ 4894 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 4895 return null; 4896 } 4897 4898 /** 4899 * Called by the {@link android.view.inputmethod.InputMethodManager} 4900 * when a view who is not the current 4901 * input connection target is trying to make a call on the manager. The 4902 * default implementation returns false; you can override this to return 4903 * true for certain views if you are performing InputConnection proxying 4904 * to them. 4905 * @param view The View that is making the InputMethodManager call. 4906 * @return Return true to allow the call, false to reject. 4907 */ 4908 public boolean checkInputConnectionProxy(View view) { 4909 return false; 4910 } 4911 4912 /** 4913 * Show the context menu for this view. It is not safe to hold on to the 4914 * menu after returning from this method. 4915 * 4916 * You should normally not overload this method. Overload 4917 * {@link #onCreateContextMenu(ContextMenu)} or define an 4918 * {@link OnCreateContextMenuListener} to add items to the context menu. 4919 * 4920 * @param menu The context menu to populate 4921 */ 4922 public void createContextMenu(ContextMenu menu) { 4923 ContextMenuInfo menuInfo = getContextMenuInfo(); 4924 4925 // Sets the current menu info so all items added to menu will have 4926 // my extra info set. 4927 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 4928 4929 onCreateContextMenu(menu); 4930 if (mOnCreateContextMenuListener != null) { 4931 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 4932 } 4933 4934 // Clear the extra information so subsequent items that aren't mine don't 4935 // have my extra info. 4936 ((MenuBuilder)menu).setCurrentMenuInfo(null); 4937 4938 if (mParent != null) { 4939 mParent.createContextMenu(menu); 4940 } 4941 } 4942 4943 /** 4944 * Views should implement this if they have extra information to associate 4945 * with the context menu. The return result is supplied as a parameter to 4946 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 4947 * callback. 4948 * 4949 * @return Extra information about the item for which the context menu 4950 * should be shown. This information will vary across different 4951 * subclasses of View. 4952 */ 4953 protected ContextMenuInfo getContextMenuInfo() { 4954 return null; 4955 } 4956 4957 /** 4958 * Views should implement this if the view itself is going to add items to 4959 * the context menu. 4960 * 4961 * @param menu the context menu to populate 4962 */ 4963 protected void onCreateContextMenu(ContextMenu menu) { 4964 } 4965 4966 /** 4967 * Implement this method to handle trackball motion events. The 4968 * <em>relative</em> movement of the trackball since the last event 4969 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 4970 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 4971 * that a movement of 1 corresponds to the user pressing one DPAD key (so 4972 * they will often be fractional values, representing the more fine-grained 4973 * movement information available from a trackball). 4974 * 4975 * @param event The motion event. 4976 * @return True if the event was handled, false otherwise. 4977 */ 4978 public boolean onTrackballEvent(MotionEvent event) { 4979 return false; 4980 } 4981 4982 /** 4983 * Implement this method to handle touch screen motion events. 4984 * 4985 * @param event The motion event. 4986 * @return True if the event was handled, false otherwise. 4987 */ 4988 public boolean onTouchEvent(MotionEvent event) { 4989 final int viewFlags = mViewFlags; 4990 4991 if ((viewFlags & ENABLED_MASK) == DISABLED) { 4992 // A disabled view that is clickable still consumes the touch 4993 // events, it just doesn't respond to them. 4994 return (((viewFlags & CLICKABLE) == CLICKABLE || 4995 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 4996 } 4997 4998 if (mTouchDelegate != null) { 4999 if (mTouchDelegate.onTouchEvent(event)) { 5000 return true; 5001 } 5002 } 5003 5004 if (((viewFlags & CLICKABLE) == CLICKABLE || 5005 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 5006 switch (event.getAction()) { 5007 case MotionEvent.ACTION_UP: 5008 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 5009 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 5010 // take focus if we don't have it already and we should in 5011 // touch mode. 5012 boolean focusTaken = false; 5013 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 5014 focusTaken = requestFocus(); 5015 } 5016 5017 if (!mHasPerformedLongPress) { 5018 // This is a tap, so remove the longpress check 5019 removeLongPressCallback(); 5020 5021 // Only perform take click actions if we were in the pressed state 5022 if (!focusTaken) { 5023 // Use a Runnable and post this rather than calling 5024 // performClick directly. This lets other visual state 5025 // of the view update before click actions start. 5026 if (mPerformClick == null) { 5027 mPerformClick = new PerformClick(); 5028 } 5029 if (!post(mPerformClick)) { 5030 performClick(); 5031 } 5032 } 5033 } 5034 5035 if (mUnsetPressedState == null) { 5036 mUnsetPressedState = new UnsetPressedState(); 5037 } 5038 5039 if (prepressed) { 5040 mPrivateFlags |= PRESSED; 5041 refreshDrawableState(); 5042 postDelayed(mUnsetPressedState, 5043 ViewConfiguration.getPressedStateDuration()); 5044 } else if (!post(mUnsetPressedState)) { 5045 // If the post failed, unpress right now 5046 mUnsetPressedState.run(); 5047 } 5048 removeTapCallback(); 5049 } 5050 break; 5051 5052 case MotionEvent.ACTION_DOWN: 5053 if (mPendingCheckForTap == null) { 5054 mPendingCheckForTap = new CheckForTap(); 5055 } 5056 mPrivateFlags |= PREPRESSED; 5057 mHasPerformedLongPress = false; 5058 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 5059 break; 5060 5061 case MotionEvent.ACTION_CANCEL: 5062 mPrivateFlags &= ~PRESSED; 5063 refreshDrawableState(); 5064 removeTapCallback(); 5065 break; 5066 5067 case MotionEvent.ACTION_MOVE: 5068 final int x = (int) event.getX(); 5069 final int y = (int) event.getY(); 5070 5071 // Be lenient about moving outside of buttons 5072 if (!pointInView(x, y, mTouchSlop)) { 5073 // Outside button 5074 removeTapCallback(); 5075 if ((mPrivateFlags & PRESSED) != 0) { 5076 // Remove any future long press/tap checks 5077 removeLongPressCallback(); 5078 5079 // Need to switch from pressed to not pressed 5080 mPrivateFlags &= ~PRESSED; 5081 refreshDrawableState(); 5082 } 5083 } 5084 break; 5085 } 5086 return true; 5087 } 5088 5089 return false; 5090 } 5091 5092 /** 5093 * Remove the longpress detection timer. 5094 */ 5095 private void removeLongPressCallback() { 5096 if (mPendingCheckForLongPress != null) { 5097 removeCallbacks(mPendingCheckForLongPress); 5098 } 5099 } 5100 5101 /** 5102 * Remove the prepress detection timer. 5103 */ 5104 private void removeUnsetPressCallback() { 5105 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 5106 setPressed(false); 5107 removeCallbacks(mUnsetPressedState); 5108 } 5109 } 5110 5111 /** 5112 * Remove the tap detection timer. 5113 */ 5114 private void removeTapCallback() { 5115 if (mPendingCheckForTap != null) { 5116 mPrivateFlags &= ~PREPRESSED; 5117 removeCallbacks(mPendingCheckForTap); 5118 } 5119 } 5120 5121 /** 5122 * Cancels a pending long press. Your subclass can use this if you 5123 * want the context menu to come up if the user presses and holds 5124 * at the same place, but you don't want it to come up if they press 5125 * and then move around enough to cause scrolling. 5126 */ 5127 public void cancelLongPress() { 5128 removeLongPressCallback(); 5129 5130 /* 5131 * The prepressed state handled by the tap callback is a display 5132 * construct, but the tap callback will post a long press callback 5133 * less its own timeout. Remove it here. 5134 */ 5135 removeTapCallback(); 5136 } 5137 5138 /** 5139 * Sets the TouchDelegate for this View. 5140 */ 5141 public void setTouchDelegate(TouchDelegate delegate) { 5142 mTouchDelegate = delegate; 5143 } 5144 5145 /** 5146 * Gets the TouchDelegate for this View. 5147 */ 5148 public TouchDelegate getTouchDelegate() { 5149 return mTouchDelegate; 5150 } 5151 5152 /** 5153 * Set flags controlling behavior of this view. 5154 * 5155 * @param flags Constant indicating the value which should be set 5156 * @param mask Constant indicating the bit range that should be changed 5157 */ 5158 void setFlags(int flags, int mask) { 5159 int old = mViewFlags; 5160 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 5161 5162 int changed = mViewFlags ^ old; 5163 if (changed == 0) { 5164 return; 5165 } 5166 int privateFlags = mPrivateFlags; 5167 5168 /* Check if the FOCUSABLE bit has changed */ 5169 if (((changed & FOCUSABLE_MASK) != 0) && 5170 ((privateFlags & HAS_BOUNDS) !=0)) { 5171 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 5172 && ((privateFlags & FOCUSED) != 0)) { 5173 /* Give up focus if we are no longer focusable */ 5174 clearFocus(); 5175 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 5176 && ((privateFlags & FOCUSED) == 0)) { 5177 /* 5178 * Tell the view system that we are now available to take focus 5179 * if no one else already has it. 5180 */ 5181 if (mParent != null) mParent.focusableViewAvailable(this); 5182 } 5183 } 5184 5185 if ((flags & VISIBILITY_MASK) == VISIBLE) { 5186 if ((changed & VISIBILITY_MASK) != 0) { 5187 /* 5188 * If this view is becoming visible, set the DRAWN flag so that 5189 * the next invalidate() will not be skipped. 5190 */ 5191 mPrivateFlags |= DRAWN; 5192 5193 needGlobalAttributesUpdate(true); 5194 5195 // a view becoming visible is worth notifying the parent 5196 // about in case nothing has focus. even if this specific view 5197 // isn't focusable, it may contain something that is, so let 5198 // the root view try to give this focus if nothing else does. 5199 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 5200 mParent.focusableViewAvailable(this); 5201 } 5202 } 5203 } 5204 5205 /* Check if the GONE bit has changed */ 5206 if ((changed & GONE) != 0) { 5207 needGlobalAttributesUpdate(false); 5208 requestLayout(); 5209 invalidate(); 5210 5211 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 5212 if (hasFocus()) clearFocus(); 5213 destroyDrawingCache(); 5214 } 5215 if (mAttachInfo != null) { 5216 mAttachInfo.mViewVisibilityChanged = true; 5217 } 5218 } 5219 5220 /* Check if the VISIBLE bit has changed */ 5221 if ((changed & INVISIBLE) != 0) { 5222 needGlobalAttributesUpdate(false); 5223 invalidate(); 5224 5225 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 5226 // root view becoming invisible shouldn't clear focus 5227 if (getRootView() != this) { 5228 clearFocus(); 5229 } 5230 } 5231 if (mAttachInfo != null) { 5232 mAttachInfo.mViewVisibilityChanged = true; 5233 } 5234 } 5235 5236 if ((changed & VISIBILITY_MASK) != 0) { 5237 if (mParent instanceof ViewGroup) { 5238 ((ViewGroup)mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5239 } 5240 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5241 } 5242 5243 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 5244 destroyDrawingCache(); 5245 } 5246 5247 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 5248 destroyDrawingCache(); 5249 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5250 } 5251 5252 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 5253 destroyDrawingCache(); 5254 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5255 } 5256 5257 if ((changed & DRAW_MASK) != 0) { 5258 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 5259 if (mBGDrawable != null) { 5260 mPrivateFlags &= ~SKIP_DRAW; 5261 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 5262 } else { 5263 mPrivateFlags |= SKIP_DRAW; 5264 } 5265 } else { 5266 mPrivateFlags &= ~SKIP_DRAW; 5267 } 5268 requestLayout(); 5269 invalidate(); 5270 } 5271 5272 if ((changed & KEEP_SCREEN_ON) != 0) { 5273 if (mParent != null) { 5274 mParent.recomputeViewAttributes(this); 5275 } 5276 } 5277 } 5278 5279 /** 5280 * Change the view's z order in the tree, so it's on top of other sibling 5281 * views 5282 */ 5283 public void bringToFront() { 5284 if (mParent != null) { 5285 mParent.bringChildToFront(this); 5286 } 5287 } 5288 5289 /** 5290 * This is called in response to an internal scroll in this view (i.e., the 5291 * view scrolled its own contents). This is typically as a result of 5292 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 5293 * called. 5294 * 5295 * @param l Current horizontal scroll origin. 5296 * @param t Current vertical scroll origin. 5297 * @param oldl Previous horizontal scroll origin. 5298 * @param oldt Previous vertical scroll origin. 5299 */ 5300 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 5301 mBackgroundSizeChanged = true; 5302 5303 final AttachInfo ai = mAttachInfo; 5304 if (ai != null) { 5305 ai.mViewScrollChanged = true; 5306 } 5307 } 5308 5309 /** 5310 * Interface definition for a callback to be invoked when the layout bounds of a view 5311 * changes due to layout processing. 5312 */ 5313 public interface OnLayoutChangeListener { 5314 /** 5315 * Called when the focus state of a view has changed. 5316 * 5317 * @param v The view whose state has changed. 5318 * @param left The new value of the view's left property. 5319 * @param top The new value of the view's top property. 5320 * @param right The new value of the view's right property. 5321 * @param bottom The new value of the view's bottom property. 5322 * @param oldLeft The previous value of the view's left property. 5323 * @param oldTop The previous value of the view's top property. 5324 * @param oldRight The previous value of the view's right property. 5325 * @param oldBottom The previous value of the view's bottom property. 5326 */ 5327 void onLayoutChange(View v, int left, int top, int right, int bottom, 5328 int oldLeft, int oldTop, int oldRight, int oldBottom); 5329 } 5330 5331 /** 5332 * This is called during layout when the size of this view has changed. If 5333 * you were just added to the view hierarchy, you're called with the old 5334 * values of 0. 5335 * 5336 * @param w Current width of this view. 5337 * @param h Current height of this view. 5338 * @param oldw Old width of this view. 5339 * @param oldh Old height of this view. 5340 */ 5341 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 5342 } 5343 5344 /** 5345 * Called by draw to draw the child views. This may be overridden 5346 * by derived classes to gain control just before its children are drawn 5347 * (but after its own view has been drawn). 5348 * @param canvas the canvas on which to draw the view 5349 */ 5350 protected void dispatchDraw(Canvas canvas) { 5351 } 5352 5353 /** 5354 * Gets the parent of this view. Note that the parent is a 5355 * ViewParent and not necessarily a View. 5356 * 5357 * @return Parent of this view. 5358 */ 5359 public final ViewParent getParent() { 5360 return mParent; 5361 } 5362 5363 /** 5364 * Return the scrolled left position of this view. This is the left edge of 5365 * the displayed part of your view. You do not need to draw any pixels 5366 * farther left, since those are outside of the frame of your view on 5367 * screen. 5368 * 5369 * @return The left edge of the displayed part of your view, in pixels. 5370 */ 5371 public final int getScrollX() { 5372 return mScrollX; 5373 } 5374 5375 /** 5376 * Return the scrolled top position of this view. This is the top edge of 5377 * the displayed part of your view. You do not need to draw any pixels above 5378 * it, since those are outside of the frame of your view on screen. 5379 * 5380 * @return The top edge of the displayed part of your view, in pixels. 5381 */ 5382 public final int getScrollY() { 5383 return mScrollY; 5384 } 5385 5386 /** 5387 * Return the width of the your view. 5388 * 5389 * @return The width of your view, in pixels. 5390 */ 5391 @ViewDebug.ExportedProperty(category = "layout") 5392 public final int getWidth() { 5393 return mRight - mLeft; 5394 } 5395 5396 /** 5397 * Return the height of your view. 5398 * 5399 * @return The height of your view, in pixels. 5400 */ 5401 @ViewDebug.ExportedProperty(category = "layout") 5402 public final int getHeight() { 5403 return mBottom - mTop; 5404 } 5405 5406 /** 5407 * Return the visible drawing bounds of your view. Fills in the output 5408 * rectangle with the values from getScrollX(), getScrollY(), 5409 * getWidth(), and getHeight(). 5410 * 5411 * @param outRect The (scrolled) drawing bounds of the view. 5412 */ 5413 public void getDrawingRect(Rect outRect) { 5414 outRect.left = mScrollX; 5415 outRect.top = mScrollY; 5416 outRect.right = mScrollX + (mRight - mLeft); 5417 outRect.bottom = mScrollY + (mBottom - mTop); 5418 } 5419 5420 /** 5421 * Like {@link #getMeasuredWidthAndState()}, but only returns the 5422 * raw width component (that is the result is masked by 5423 * {@link #MEASURED_SIZE_MASK}). 5424 * 5425 * @return The raw measured width of this view. 5426 */ 5427 public final int getMeasuredWidth() { 5428 return mMeasuredWidth & MEASURED_SIZE_MASK; 5429 } 5430 5431 /** 5432 * Return the full width measurement information for this view as computed 5433 * by the most recent call to {@link #measure}. This result is a bit mask 5434 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5435 * This should be used during measurement and layout calculations only. Use 5436 * {@link #getWidth()} to see how wide a view is after layout. 5437 * 5438 * @return The measured width of this view as a bit mask. 5439 */ 5440 public final int getMeasuredWidthAndState() { 5441 return mMeasuredWidth; 5442 } 5443 5444 /** 5445 * Like {@link #getMeasuredHeightAndState()}, but only returns the 5446 * raw width component (that is the result is masked by 5447 * {@link #MEASURED_SIZE_MASK}). 5448 * 5449 * @return The raw measured height of this view. 5450 */ 5451 public final int getMeasuredHeight() { 5452 return mMeasuredHeight & MEASURED_SIZE_MASK; 5453 } 5454 5455 /** 5456 * Return the full height measurement information for this view as computed 5457 * by the most recent call to {@link #measure}. This result is a bit mask 5458 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5459 * This should be used during measurement and layout calculations only. Use 5460 * {@link #getHeight()} to see how wide a view is after layout. 5461 * 5462 * @return The measured width of this view as a bit mask. 5463 */ 5464 public final int getMeasuredHeightAndState() { 5465 return mMeasuredHeight; 5466 } 5467 5468 /** 5469 * Return only the state bits of {@link #getMeasuredWidthAndState()} 5470 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 5471 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 5472 * and the height component is at the shifted bits 5473 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 5474 */ 5475 public final int getMeasuredState() { 5476 return (mMeasuredWidth&MEASURED_STATE_MASK) 5477 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 5478 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 5479 } 5480 5481 /** 5482 * The transform matrix of this view, which is calculated based on the current 5483 * roation, scale, and pivot properties. 5484 * 5485 * @see #getRotation() 5486 * @see #getScaleX() 5487 * @see #getScaleY() 5488 * @see #getPivotX() 5489 * @see #getPivotY() 5490 * @return The current transform matrix for the view 5491 */ 5492 public Matrix getMatrix() { 5493 updateMatrix(); 5494 return mMatrix; 5495 } 5496 5497 /** 5498 * Utility function to determine if the value is far enough away from zero to be 5499 * considered non-zero. 5500 * @param value A floating point value to check for zero-ness 5501 * @return whether the passed-in value is far enough away from zero to be considered non-zero 5502 */ 5503 private static boolean nonzero(float value) { 5504 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 5505 } 5506 5507 /** 5508 * Returns true if the transform matrix is the identity matrix. 5509 * Recomputes the matrix if necessary. 5510 * 5511 * @return True if the transform matrix is the identity matrix, false otherwise. 5512 */ 5513 final boolean hasIdentityMatrix() { 5514 updateMatrix(); 5515 return mMatrixIsIdentity; 5516 } 5517 5518 /** 5519 * Recomputes the transform matrix if necessary. 5520 */ 5521 private void updateMatrix() { 5522 if (mMatrixDirty) { 5523 // transform-related properties have changed since the last time someone 5524 // asked for the matrix; recalculate it with the current values 5525 5526 // Figure out if we need to update the pivot point 5527 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5528 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 5529 mPrevWidth = mRight - mLeft; 5530 mPrevHeight = mBottom - mTop; 5531 mPivotX = mPrevWidth / 2f; 5532 mPivotY = mPrevHeight / 2f; 5533 } 5534 } 5535 mMatrix.reset(); 5536 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 5537 mMatrix.setTranslate(mTranslationX, mTranslationY); 5538 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 5539 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5540 } else { 5541 if (mCamera == null) { 5542 mCamera = new Camera(); 5543 matrix3D = new Matrix(); 5544 } 5545 mCamera.save(); 5546 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5547 mCamera.rotateX(mRotationX); 5548 mCamera.rotateY(mRotationY); 5549 mCamera.rotateZ(-mRotation); 5550 mCamera.getMatrix(matrix3D); 5551 matrix3D.preTranslate(-mPivotX, -mPivotY); 5552 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 5553 mMatrix.postConcat(matrix3D); 5554 mCamera.restore(); 5555 } 5556 mMatrixDirty = false; 5557 mMatrixIsIdentity = mMatrix.isIdentity(); 5558 mInverseMatrixDirty = true; 5559 } 5560 } 5561 5562 /** 5563 * Utility method to retrieve the inverse of the current mMatrix property. 5564 * We cache the matrix to avoid recalculating it when transform properties 5565 * have not changed. 5566 * 5567 * @return The inverse of the current matrix of this view. 5568 */ 5569 final Matrix getInverseMatrix() { 5570 updateMatrix(); 5571 if (mInverseMatrixDirty) { 5572 if (mInverseMatrix == null) { 5573 mInverseMatrix = new Matrix(); 5574 } 5575 mMatrix.invert(mInverseMatrix); 5576 mInverseMatrixDirty = false; 5577 } 5578 return mInverseMatrix; 5579 } 5580 5581 /** 5582 * The degrees that the view is rotated around the pivot point. 5583 * 5584 * @see #getPivotX() 5585 * @see #getPivotY() 5586 * @return The degrees of rotation. 5587 */ 5588 public float getRotation() { 5589 return mRotation; 5590 } 5591 5592 /** 5593 * Sets the degrees that the view is rotated around the pivot point. Increasing values 5594 * result in clockwise rotation. 5595 * 5596 * @param rotation The degrees of rotation. 5597 * @see #getPivotX() 5598 * @see #getPivotY() 5599 * 5600 * @attr ref android.R.styleable#View_rotation 5601 */ 5602 public void setRotation(float rotation) { 5603 if (mRotation != rotation) { 5604 // Double-invalidation is necessary to capture view's old and new areas 5605 invalidate(false); 5606 mRotation = rotation; 5607 mMatrixDirty = true; 5608 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5609 invalidate(false); 5610 } 5611 } 5612 5613 /** 5614 * The degrees that the view is rotated around the vertical axis through the pivot point. 5615 * 5616 * @see #getPivotX() 5617 * @see #getPivotY() 5618 * @return The degrees of Y rotation. 5619 */ 5620 public float getRotationY() { 5621 return mRotationY; 5622 } 5623 5624 /** 5625 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 5626 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 5627 * down the y axis. 5628 * 5629 * @param rotationY The degrees of Y rotation. 5630 * @see #getPivotX() 5631 * @see #getPivotY() 5632 * 5633 * @attr ref android.R.styleable#View_rotationY 5634 */ 5635 public void setRotationY(float rotationY) { 5636 if (mRotationY != rotationY) { 5637 // Double-invalidation is necessary to capture view's old and new areas 5638 invalidate(false); 5639 mRotationY = rotationY; 5640 mMatrixDirty = true; 5641 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5642 invalidate(false); 5643 } 5644 } 5645 5646 /** 5647 * The degrees that the view is rotated around the horizontal axis through the pivot point. 5648 * 5649 * @see #getPivotX() 5650 * @see #getPivotY() 5651 * @return The degrees of X rotation. 5652 */ 5653 public float getRotationX() { 5654 return mRotationX; 5655 } 5656 5657 /** 5658 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 5659 * Increasing values result in clockwise rotation from the viewpoint of looking down the 5660 * x axis. 5661 * 5662 * @param rotationX The degrees of X rotation. 5663 * @see #getPivotX() 5664 * @see #getPivotY() 5665 * 5666 * @attr ref android.R.styleable#View_rotationX 5667 */ 5668 public void setRotationX(float rotationX) { 5669 if (mRotationX != rotationX) { 5670 // Double-invalidation is necessary to capture view's old and new areas 5671 invalidate(false); 5672 mRotationX = rotationX; 5673 mMatrixDirty = true; 5674 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5675 invalidate(false); 5676 } 5677 } 5678 5679 /** 5680 * The amount that the view is scaled in x around the pivot point, as a proportion of 5681 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 5682 * 5683 * <p>By default, this is 1.0f. 5684 * 5685 * @see #getPivotX() 5686 * @see #getPivotY() 5687 * @return The scaling factor. 5688 */ 5689 public float getScaleX() { 5690 return mScaleX; 5691 } 5692 5693 /** 5694 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 5695 * the view's unscaled width. A value of 1 means that no scaling is applied. 5696 * 5697 * @param scaleX The scaling factor. 5698 * @see #getPivotX() 5699 * @see #getPivotY() 5700 * 5701 * @attr ref android.R.styleable#View_scaleX 5702 */ 5703 public void setScaleX(float scaleX) { 5704 if (mScaleX != scaleX) { 5705 // Double-invalidation is necessary to capture view's old and new areas 5706 invalidate(false); 5707 mScaleX = scaleX; 5708 mMatrixDirty = true; 5709 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5710 invalidate(false); 5711 } 5712 } 5713 5714 /** 5715 * The amount that the view is scaled in y around the pivot point, as a proportion of 5716 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 5717 * 5718 * <p>By default, this is 1.0f. 5719 * 5720 * @see #getPivotX() 5721 * @see #getPivotY() 5722 * @return The scaling factor. 5723 */ 5724 public float getScaleY() { 5725 return mScaleY; 5726 } 5727 5728 /** 5729 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 5730 * the view's unscaled width. A value of 1 means that no scaling is applied. 5731 * 5732 * @param scaleY The scaling factor. 5733 * @see #getPivotX() 5734 * @see #getPivotY() 5735 * 5736 * @attr ref android.R.styleable#View_scaleY 5737 */ 5738 public void setScaleY(float scaleY) { 5739 if (mScaleY != scaleY) { 5740 // Double-invalidation is necessary to capture view's old and new areas 5741 invalidate(false); 5742 mScaleY = scaleY; 5743 mMatrixDirty = true; 5744 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5745 invalidate(false); 5746 } 5747 } 5748 5749 /** 5750 * The x location of the point around which the view is {@link #setRotation(float) rotated} 5751 * and {@link #setScaleX(float) scaled}. 5752 * 5753 * @see #getRotation() 5754 * @see #getScaleX() 5755 * @see #getScaleY() 5756 * @see #getPivotY() 5757 * @return The x location of the pivot point. 5758 */ 5759 public float getPivotX() { 5760 return mPivotX; 5761 } 5762 5763 /** 5764 * Sets the x location of the point around which the view is 5765 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 5766 * By default, the pivot point is centered on the object. 5767 * Setting this property disables this behavior and causes the view to use only the 5768 * explicitly set pivotX and pivotY values. 5769 * 5770 * @param pivotX The x location of the pivot point. 5771 * @see #getRotation() 5772 * @see #getScaleX() 5773 * @see #getScaleY() 5774 * @see #getPivotY() 5775 * 5776 * @attr ref android.R.styleable#View_transformPivotX 5777 */ 5778 public void setPivotX(float pivotX) { 5779 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5780 if (mPivotX != pivotX) { 5781 // Double-invalidation is necessary to capture view's old and new areas 5782 invalidate(false); 5783 mPivotX = pivotX; 5784 mMatrixDirty = true; 5785 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5786 invalidate(false); 5787 } 5788 } 5789 5790 /** 5791 * The y location of the point around which the view is {@link #setRotation(float) rotated} 5792 * and {@link #setScaleY(float) scaled}. 5793 * 5794 * @see #getRotation() 5795 * @see #getScaleX() 5796 * @see #getScaleY() 5797 * @see #getPivotY() 5798 * @return The y location of the pivot point. 5799 */ 5800 public float getPivotY() { 5801 return mPivotY; 5802 } 5803 5804 /** 5805 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 5806 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 5807 * Setting this property disables this behavior and causes the view to use only the 5808 * explicitly set pivotX and pivotY values. 5809 * 5810 * @param pivotY The y location of the pivot point. 5811 * @see #getRotation() 5812 * @see #getScaleX() 5813 * @see #getScaleY() 5814 * @see #getPivotY() 5815 * 5816 * @attr ref android.R.styleable#View_transformPivotY 5817 */ 5818 public void setPivotY(float pivotY) { 5819 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5820 if (mPivotY != pivotY) { 5821 // Double-invalidation is necessary to capture view's old and new areas 5822 invalidate(false); 5823 mPivotY = pivotY; 5824 mMatrixDirty = true; 5825 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5826 invalidate(false); 5827 } 5828 } 5829 5830 /** 5831 * The opacity of the view. This is a value from 0 to 1, where 0 means the view is 5832 * completely transparent and 1 means the view is completely opaque. 5833 * 5834 * <p>By default this is 1.0f. 5835 * @return The opacity of the view. 5836 */ 5837 public float getAlpha() { 5838 return mAlpha; 5839 } 5840 5841 /** 5842 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 5843 * completely transparent and 1 means the view is completely opaque.</p> 5844 * 5845 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 5846 * responsible for applying the opacity itself. Otherwise, calling this method is 5847 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 5848 * setting a hardware layer.</p> 5849 * 5850 * @param alpha The opacity of the view. 5851 * 5852 * @see #setLayerType(int, android.graphics.Paint) 5853 * 5854 * @attr ref android.R.styleable#View_alpha 5855 */ 5856 public void setAlpha(float alpha) { 5857 mAlpha = alpha; 5858 if (onSetAlpha((int) (alpha * 255))) { 5859 mPrivateFlags |= ALPHA_SET; 5860 // subclass is handling alpha - don't optimize rendering cache invalidation 5861 invalidate(); 5862 } else { 5863 mPrivateFlags &= ~ALPHA_SET; 5864 invalidate(false); 5865 } 5866 } 5867 5868 /** 5869 * Top position of this view relative to its parent. 5870 * 5871 * @return The top of this view, in pixels. 5872 */ 5873 @ViewDebug.CapturedViewProperty 5874 public final int getTop() { 5875 return mTop; 5876 } 5877 5878 /** 5879 * Sets the top position of this view relative to its parent. This method is meant to be called 5880 * by the layout system and should not generally be called otherwise, because the property 5881 * may be changed at any time by the layout. 5882 * 5883 * @param top The top of this view, in pixels. 5884 */ 5885 public final void setTop(int top) { 5886 if (top != mTop) { 5887 updateMatrix(); 5888 if (mMatrixIsIdentity) { 5889 final ViewParent p = mParent; 5890 if (p != null && mAttachInfo != null) { 5891 final Rect r = mAttachInfo.mTmpInvalRect; 5892 int minTop; 5893 int yLoc; 5894 if (top < mTop) { 5895 minTop = top; 5896 yLoc = top - mTop; 5897 } else { 5898 minTop = mTop; 5899 yLoc = 0; 5900 } 5901 r.set(0, yLoc, mRight - mLeft, mBottom - minTop); 5902 p.invalidateChild(this, r); 5903 } 5904 } else { 5905 // Double-invalidation is necessary to capture view's old and new areas 5906 invalidate(); 5907 } 5908 5909 int width = mRight - mLeft; 5910 int oldHeight = mBottom - mTop; 5911 5912 mTop = top; 5913 5914 onSizeChanged(width, mBottom - mTop, width, oldHeight); 5915 5916 if (!mMatrixIsIdentity) { 5917 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5918 // A change in dimension means an auto-centered pivot point changes, too 5919 mMatrixDirty = true; 5920 } 5921 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5922 invalidate(); 5923 } 5924 mBackgroundSizeChanged = true; 5925 } 5926 } 5927 5928 /** 5929 * Bottom position of this view relative to its parent. 5930 * 5931 * @return The bottom of this view, in pixels. 5932 */ 5933 @ViewDebug.CapturedViewProperty 5934 public final int getBottom() { 5935 return mBottom; 5936 } 5937 5938 /** 5939 * True if this view has changed since the last time being drawn. 5940 * 5941 * @return The dirty state of this view. 5942 */ 5943 public boolean isDirty() { 5944 return (mPrivateFlags & DIRTY_MASK) != 0; 5945 } 5946 5947 /** 5948 * Sets the bottom position of this view relative to its parent. This method is meant to be 5949 * called by the layout system and should not generally be called otherwise, because the 5950 * property may be changed at any time by the layout. 5951 * 5952 * @param bottom The bottom of this view, in pixels. 5953 */ 5954 public final void setBottom(int bottom) { 5955 if (bottom != mBottom) { 5956 updateMatrix(); 5957 if (mMatrixIsIdentity) { 5958 final ViewParent p = mParent; 5959 if (p != null && mAttachInfo != null) { 5960 final Rect r = mAttachInfo.mTmpInvalRect; 5961 int maxBottom; 5962 if (bottom < mBottom) { 5963 maxBottom = mBottom; 5964 } else { 5965 maxBottom = bottom; 5966 } 5967 r.set(0, 0, mRight - mLeft, maxBottom - mTop); 5968 p.invalidateChild(this, r); 5969 } 5970 } else { 5971 // Double-invalidation is necessary to capture view's old and new areas 5972 invalidate(); 5973 } 5974 5975 int width = mRight - mLeft; 5976 int oldHeight = mBottom - mTop; 5977 5978 mBottom = bottom; 5979 5980 onSizeChanged(width, mBottom - mTop, width, oldHeight); 5981 5982 if (!mMatrixIsIdentity) { 5983 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5984 // A change in dimension means an auto-centered pivot point changes, too 5985 mMatrixDirty = true; 5986 } 5987 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5988 invalidate(); 5989 } 5990 mBackgroundSizeChanged = true; 5991 } 5992 } 5993 5994 /** 5995 * Left position of this view relative to its parent. 5996 * 5997 * @return The left edge of this view, in pixels. 5998 */ 5999 @ViewDebug.CapturedViewProperty 6000 public final int getLeft() { 6001 return mLeft; 6002 } 6003 6004 /** 6005 * Sets the left position of this view relative to its parent. This method is meant to be called 6006 * by the layout system and should not generally be called otherwise, because the property 6007 * may be changed at any time by the layout. 6008 * 6009 * @param left The bottom of this view, in pixels. 6010 */ 6011 public final void setLeft(int left) { 6012 if (left != mLeft) { 6013 updateMatrix(); 6014 if (mMatrixIsIdentity) { 6015 final ViewParent p = mParent; 6016 if (p != null && mAttachInfo != null) { 6017 final Rect r = mAttachInfo.mTmpInvalRect; 6018 int minLeft; 6019 int xLoc; 6020 if (left < mLeft) { 6021 minLeft = left; 6022 xLoc = left - mLeft; 6023 } else { 6024 minLeft = mLeft; 6025 xLoc = 0; 6026 } 6027 r.set(xLoc, 0, mRight - minLeft, mBottom - mTop); 6028 p.invalidateChild(this, r); 6029 } 6030 } else { 6031 // Double-invalidation is necessary to capture view's old and new areas 6032 invalidate(); 6033 } 6034 6035 int oldWidth = mRight - mLeft; 6036 int height = mBottom - mTop; 6037 6038 mLeft = left; 6039 6040 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6041 6042 if (!mMatrixIsIdentity) { 6043 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6044 // A change in dimension means an auto-centered pivot point changes, too 6045 mMatrixDirty = true; 6046 } 6047 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6048 invalidate(); 6049 } 6050 mBackgroundSizeChanged = true; 6051 } 6052 } 6053 6054 /** 6055 * Right position of this view relative to its parent. 6056 * 6057 * @return The right edge of this view, in pixels. 6058 */ 6059 @ViewDebug.CapturedViewProperty 6060 public final int getRight() { 6061 return mRight; 6062 } 6063 6064 /** 6065 * Sets the right position of this view relative to its parent. This method is meant to be called 6066 * by the layout system and should not generally be called otherwise, because the property 6067 * may be changed at any time by the layout. 6068 * 6069 * @param right The bottom of this view, in pixels. 6070 */ 6071 public final void setRight(int right) { 6072 if (right != mRight) { 6073 updateMatrix(); 6074 if (mMatrixIsIdentity) { 6075 final ViewParent p = mParent; 6076 if (p != null && mAttachInfo != null) { 6077 final Rect r = mAttachInfo.mTmpInvalRect; 6078 int maxRight; 6079 if (right < mRight) { 6080 maxRight = mRight; 6081 } else { 6082 maxRight = right; 6083 } 6084 r.set(0, 0, maxRight - mLeft, mBottom - mTop); 6085 p.invalidateChild(this, r); 6086 } 6087 } else { 6088 // Double-invalidation is necessary to capture view's old and new areas 6089 invalidate(); 6090 } 6091 6092 int oldWidth = mRight - mLeft; 6093 int height = mBottom - mTop; 6094 6095 mRight = right; 6096 6097 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6098 6099 if (!mMatrixIsIdentity) { 6100 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6101 // A change in dimension means an auto-centered pivot point changes, too 6102 mMatrixDirty = true; 6103 } 6104 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6105 invalidate(); 6106 } 6107 mBackgroundSizeChanged = true; 6108 } 6109 } 6110 6111 /** 6112 * The visual x position of this view, in pixels. This is equivalent to the 6113 * {@link #setTranslationX(float) translationX} property plus the current 6114 * {@link #getLeft() left} property. 6115 * 6116 * @return The visual x position of this view, in pixels. 6117 */ 6118 public float getX() { 6119 return mLeft + mTranslationX; 6120 } 6121 6122 /** 6123 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 6124 * {@link #setTranslationX(float) translationX} property to be the difference between 6125 * the x value passed in and the current {@link #getLeft() left} property. 6126 * 6127 * @param x The visual x position of this view, in pixels. 6128 */ 6129 public void setX(float x) { 6130 setTranslationX(x - mLeft); 6131 } 6132 6133 /** 6134 * The visual y position of this view, in pixels. This is equivalent to the 6135 * {@link #setTranslationY(float) translationY} property plus the current 6136 * {@link #getTop() top} property. 6137 * 6138 * @return The visual y position of this view, in pixels. 6139 */ 6140 public float getY() { 6141 return mTop + mTranslationY; 6142 } 6143 6144 /** 6145 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 6146 * {@link #setTranslationY(float) translationY} property to be the difference between 6147 * the y value passed in and the current {@link #getTop() top} property. 6148 * 6149 * @param y The visual y position of this view, in pixels. 6150 */ 6151 public void setY(float y) { 6152 setTranslationY(y - mTop); 6153 } 6154 6155 6156 /** 6157 * The horizontal location of this view relative to its {@link #getLeft() left} position. 6158 * This position is post-layout, in addition to wherever the object's 6159 * layout placed it. 6160 * 6161 * @return The horizontal position of this view relative to its left position, in pixels. 6162 */ 6163 public float getTranslationX() { 6164 return mTranslationX; 6165 } 6166 6167 /** 6168 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 6169 * This effectively positions the object post-layout, in addition to wherever the object's 6170 * layout placed it. 6171 * 6172 * @param translationX The horizontal position of this view relative to its left position, 6173 * in pixels. 6174 * 6175 * @attr ref android.R.styleable#View_translationX 6176 */ 6177 public void setTranslationX(float translationX) { 6178 if (mTranslationX != translationX) { 6179 // Double-invalidation is necessary to capture view's old and new areas 6180 invalidate(false); 6181 mTranslationX = translationX; 6182 mMatrixDirty = true; 6183 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6184 invalidate(false); 6185 } 6186 } 6187 6188 /** 6189 * The horizontal location of this view relative to its {@link #getTop() top} position. 6190 * This position is post-layout, in addition to wherever the object's 6191 * layout placed it. 6192 * 6193 * @return The vertical position of this view relative to its top position, 6194 * in pixels. 6195 */ 6196 public float getTranslationY() { 6197 return mTranslationY; 6198 } 6199 6200 /** 6201 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 6202 * This effectively positions the object post-layout, in addition to wherever the object's 6203 * layout placed it. 6204 * 6205 * @param translationY The vertical position of this view relative to its top position, 6206 * in pixels. 6207 * 6208 * @attr ref android.R.styleable#View_translationY 6209 */ 6210 public void setTranslationY(float translationY) { 6211 if (mTranslationY != translationY) { 6212 // Double-invalidation is necessary to capture view's old and new areas 6213 invalidate(false); 6214 mTranslationY = translationY; 6215 mMatrixDirty = true; 6216 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6217 invalidate(false); 6218 } 6219 } 6220 6221 /** 6222 * Hit rectangle in parent's coordinates 6223 * 6224 * @param outRect The hit rectangle of the view. 6225 */ 6226 public void getHitRect(Rect outRect) { 6227 updateMatrix(); 6228 if (mMatrixIsIdentity || mAttachInfo == null) { 6229 outRect.set(mLeft, mTop, mRight, mBottom); 6230 } else { 6231 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 6232 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 6233 mMatrix.mapRect(tmpRect); 6234 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 6235 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 6236 } 6237 } 6238 6239 /** 6240 * Determines whether the given point, in local coordinates is inside the view. 6241 */ 6242 /*package*/ final boolean pointInView(float localX, float localY) { 6243 return localX >= 0 && localX < (mRight - mLeft) 6244 && localY >= 0 && localY < (mBottom - mTop); 6245 } 6246 6247 /** 6248 * Utility method to determine whether the given point, in local coordinates, 6249 * is inside the view, where the area of the view is expanded by the slop factor. 6250 * This method is called while processing touch-move events to determine if the event 6251 * is still within the view. 6252 */ 6253 private boolean pointInView(float localX, float localY, float slop) { 6254 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 6255 localY < ((mBottom - mTop) + slop); 6256 } 6257 6258 /** 6259 * When a view has focus and the user navigates away from it, the next view is searched for 6260 * starting from the rectangle filled in by this method. 6261 * 6262 * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your 6263 * view maintains some idea of internal selection, such as a cursor, or a selected row 6264 * or column, you should override this method and fill in a more specific rectangle. 6265 * 6266 * @param r The rectangle to fill in, in this view's coordinates. 6267 */ 6268 public void getFocusedRect(Rect r) { 6269 getDrawingRect(r); 6270 } 6271 6272 /** 6273 * If some part of this view is not clipped by any of its parents, then 6274 * return that area in r in global (root) coordinates. To convert r to local 6275 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 6276 * -globalOffset.y)) If the view is completely clipped or translated out, 6277 * return false. 6278 * 6279 * @param r If true is returned, r holds the global coordinates of the 6280 * visible portion of this view. 6281 * @param globalOffset If true is returned, globalOffset holds the dx,dy 6282 * between this view and its root. globalOffet may be null. 6283 * @return true if r is non-empty (i.e. part of the view is visible at the 6284 * root level. 6285 */ 6286 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 6287 int width = mRight - mLeft; 6288 int height = mBottom - mTop; 6289 if (width > 0 && height > 0) { 6290 r.set(0, 0, width, height); 6291 if (globalOffset != null) { 6292 globalOffset.set(-mScrollX, -mScrollY); 6293 } 6294 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 6295 } 6296 return false; 6297 } 6298 6299 public final boolean getGlobalVisibleRect(Rect r) { 6300 return getGlobalVisibleRect(r, null); 6301 } 6302 6303 public final boolean getLocalVisibleRect(Rect r) { 6304 Point offset = new Point(); 6305 if (getGlobalVisibleRect(r, offset)) { 6306 r.offset(-offset.x, -offset.y); // make r local 6307 return true; 6308 } 6309 return false; 6310 } 6311 6312 /** 6313 * Offset this view's vertical location by the specified number of pixels. 6314 * 6315 * @param offset the number of pixels to offset the view by 6316 */ 6317 public void offsetTopAndBottom(int offset) { 6318 if (offset != 0) { 6319 updateMatrix(); 6320 if (mMatrixIsIdentity) { 6321 final ViewParent p = mParent; 6322 if (p != null && mAttachInfo != null) { 6323 final Rect r = mAttachInfo.mTmpInvalRect; 6324 int minTop; 6325 int maxBottom; 6326 int yLoc; 6327 if (offset < 0) { 6328 minTop = mTop + offset; 6329 maxBottom = mBottom; 6330 yLoc = offset; 6331 } else { 6332 minTop = mTop; 6333 maxBottom = mBottom + offset; 6334 yLoc = 0; 6335 } 6336 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 6337 p.invalidateChild(this, r); 6338 } 6339 } else { 6340 invalidate(false); 6341 } 6342 6343 mTop += offset; 6344 mBottom += offset; 6345 6346 if (!mMatrixIsIdentity) { 6347 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6348 invalidate(false); 6349 } 6350 } 6351 } 6352 6353 /** 6354 * Offset this view's horizontal location by the specified amount of pixels. 6355 * 6356 * @param offset the numer of pixels to offset the view by 6357 */ 6358 public void offsetLeftAndRight(int offset) { 6359 if (offset != 0) { 6360 updateMatrix(); 6361 if (mMatrixIsIdentity) { 6362 final ViewParent p = mParent; 6363 if (p != null && mAttachInfo != null) { 6364 final Rect r = mAttachInfo.mTmpInvalRect; 6365 int minLeft; 6366 int maxRight; 6367 if (offset < 0) { 6368 minLeft = mLeft + offset; 6369 maxRight = mRight; 6370 } else { 6371 minLeft = mLeft; 6372 maxRight = mRight + offset; 6373 } 6374 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 6375 p.invalidateChild(this, r); 6376 } 6377 } else { 6378 invalidate(false); 6379 } 6380 6381 mLeft += offset; 6382 mRight += offset; 6383 6384 if (!mMatrixIsIdentity) { 6385 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6386 invalidate(false); 6387 } 6388 } 6389 } 6390 6391 /** 6392 * Get the LayoutParams associated with this view. All views should have 6393 * layout parameters. These supply parameters to the <i>parent</i> of this 6394 * view specifying how it should be arranged. There are many subclasses of 6395 * ViewGroup.LayoutParams, and these correspond to the different subclasses 6396 * of ViewGroup that are responsible for arranging their children. 6397 * @return The LayoutParams associated with this view 6398 */ 6399 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 6400 public ViewGroup.LayoutParams getLayoutParams() { 6401 return mLayoutParams; 6402 } 6403 6404 /** 6405 * Set the layout parameters associated with this view. These supply 6406 * parameters to the <i>parent</i> of this view specifying how it should be 6407 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 6408 * correspond to the different subclasses of ViewGroup that are responsible 6409 * for arranging their children. 6410 * 6411 * @param params the layout parameters for this view 6412 */ 6413 public void setLayoutParams(ViewGroup.LayoutParams params) { 6414 if (params == null) { 6415 throw new NullPointerException("params == null"); 6416 } 6417 mLayoutParams = params; 6418 requestLayout(); 6419 } 6420 6421 /** 6422 * Set the scrolled position of your view. This will cause a call to 6423 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6424 * invalidated. 6425 * @param x the x position to scroll to 6426 * @param y the y position to scroll to 6427 */ 6428 public void scrollTo(int x, int y) { 6429 if (mScrollX != x || mScrollY != y) { 6430 int oldX = mScrollX; 6431 int oldY = mScrollY; 6432 mScrollX = x; 6433 mScrollY = y; 6434 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 6435 if (!awakenScrollBars()) { 6436 invalidate(); 6437 } 6438 } 6439 } 6440 6441 /** 6442 * Move the scrolled position of your view. This will cause a call to 6443 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6444 * invalidated. 6445 * @param x the amount of pixels to scroll by horizontally 6446 * @param y the amount of pixels to scroll by vertically 6447 */ 6448 public void scrollBy(int x, int y) { 6449 scrollTo(mScrollX + x, mScrollY + y); 6450 } 6451 6452 /** 6453 * <p>Trigger the scrollbars to draw. When invoked this method starts an 6454 * animation to fade the scrollbars out after a default delay. If a subclass 6455 * provides animated scrolling, the start delay should equal the duration 6456 * of the scrolling animation.</p> 6457 * 6458 * <p>The animation starts only if at least one of the scrollbars is 6459 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 6460 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6461 * this method returns true, and false otherwise. If the animation is 6462 * started, this method calls {@link #invalidate()}; in that case the 6463 * caller should not call {@link #invalidate()}.</p> 6464 * 6465 * <p>This method should be invoked every time a subclass directly updates 6466 * the scroll parameters.</p> 6467 * 6468 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 6469 * and {@link #scrollTo(int, int)}.</p> 6470 * 6471 * @return true if the animation is played, false otherwise 6472 * 6473 * @see #awakenScrollBars(int) 6474 * @see #scrollBy(int, int) 6475 * @see #scrollTo(int, int) 6476 * @see #isHorizontalScrollBarEnabled() 6477 * @see #isVerticalScrollBarEnabled() 6478 * @see #setHorizontalScrollBarEnabled(boolean) 6479 * @see #setVerticalScrollBarEnabled(boolean) 6480 */ 6481 protected boolean awakenScrollBars() { 6482 return mScrollCache != null && 6483 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 6484 } 6485 6486 /** 6487 * Trigger the scrollbars to draw. 6488 * This method differs from awakenScrollBars() only in its default duration. 6489 * initialAwakenScrollBars() will show the scroll bars for longer than 6490 * usual to give the user more of a chance to notice them. 6491 * 6492 * @return true if the animation is played, false otherwise. 6493 */ 6494 private boolean initialAwakenScrollBars() { 6495 return mScrollCache != null && 6496 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 6497 } 6498 6499 /** 6500 * <p> 6501 * Trigger the scrollbars to draw. When invoked this method starts an 6502 * animation to fade the scrollbars out after a fixed delay. If a subclass 6503 * provides animated scrolling, the start delay should equal the duration of 6504 * the scrolling animation. 6505 * </p> 6506 * 6507 * <p> 6508 * The animation starts only if at least one of the scrollbars is enabled, 6509 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6510 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6511 * this method returns true, and false otherwise. If the animation is 6512 * started, this method calls {@link #invalidate()}; in that case the caller 6513 * should not call {@link #invalidate()}. 6514 * </p> 6515 * 6516 * <p> 6517 * This method should be invoked everytime a subclass directly updates the 6518 * scroll parameters. 6519 * </p> 6520 * 6521 * @param startDelay the delay, in milliseconds, after which the animation 6522 * should start; when the delay is 0, the animation starts 6523 * immediately 6524 * @return true if the animation is played, false otherwise 6525 * 6526 * @see #scrollBy(int, int) 6527 * @see #scrollTo(int, int) 6528 * @see #isHorizontalScrollBarEnabled() 6529 * @see #isVerticalScrollBarEnabled() 6530 * @see #setHorizontalScrollBarEnabled(boolean) 6531 * @see #setVerticalScrollBarEnabled(boolean) 6532 */ 6533 protected boolean awakenScrollBars(int startDelay) { 6534 return awakenScrollBars(startDelay, true); 6535 } 6536 6537 /** 6538 * <p> 6539 * Trigger the scrollbars to draw. When invoked this method starts an 6540 * animation to fade the scrollbars out after a fixed delay. If a subclass 6541 * provides animated scrolling, the start delay should equal the duration of 6542 * the scrolling animation. 6543 * </p> 6544 * 6545 * <p> 6546 * The animation starts only if at least one of the scrollbars is enabled, 6547 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6548 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6549 * this method returns true, and false otherwise. If the animation is 6550 * started, this method calls {@link #invalidate()} if the invalidate parameter 6551 * is set to true; in that case the caller 6552 * should not call {@link #invalidate()}. 6553 * </p> 6554 * 6555 * <p> 6556 * This method should be invoked everytime a subclass directly updates the 6557 * scroll parameters. 6558 * </p> 6559 * 6560 * @param startDelay the delay, in milliseconds, after which the animation 6561 * should start; when the delay is 0, the animation starts 6562 * immediately 6563 * 6564 * @param invalidate Wheter this method should call invalidate 6565 * 6566 * @return true if the animation is played, false otherwise 6567 * 6568 * @see #scrollBy(int, int) 6569 * @see #scrollTo(int, int) 6570 * @see #isHorizontalScrollBarEnabled() 6571 * @see #isVerticalScrollBarEnabled() 6572 * @see #setHorizontalScrollBarEnabled(boolean) 6573 * @see #setVerticalScrollBarEnabled(boolean) 6574 */ 6575 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 6576 final ScrollabilityCache scrollCache = mScrollCache; 6577 6578 if (scrollCache == null || !scrollCache.fadeScrollBars) { 6579 return false; 6580 } 6581 6582 if (scrollCache.scrollBar == null) { 6583 scrollCache.scrollBar = new ScrollBarDrawable(); 6584 } 6585 6586 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 6587 6588 if (invalidate) { 6589 // Invalidate to show the scrollbars 6590 invalidate(); 6591 } 6592 6593 if (scrollCache.state == ScrollabilityCache.OFF) { 6594 // FIXME: this is copied from WindowManagerService. 6595 // We should get this value from the system when it 6596 // is possible to do so. 6597 final int KEY_REPEAT_FIRST_DELAY = 750; 6598 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 6599 } 6600 6601 // Tell mScrollCache when we should start fading. This may 6602 // extend the fade start time if one was already scheduled 6603 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 6604 scrollCache.fadeStartTime = fadeStartTime; 6605 scrollCache.state = ScrollabilityCache.ON; 6606 6607 // Schedule our fader to run, unscheduling any old ones first 6608 if (mAttachInfo != null) { 6609 mAttachInfo.mHandler.removeCallbacks(scrollCache); 6610 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 6611 } 6612 6613 return true; 6614 } 6615 6616 return false; 6617 } 6618 6619 /** 6620 * Mark the the area defined by dirty as needing to be drawn. If the view is 6621 * visible, {@link #onDraw} will be called at some point in the future. 6622 * This must be called from a UI thread. To call from a non-UI thread, call 6623 * {@link #postInvalidate()}. 6624 * 6625 * WARNING: This method is destructive to dirty. 6626 * @param dirty the rectangle representing the bounds of the dirty region 6627 */ 6628 public void invalidate(Rect dirty) { 6629 if (ViewDebug.TRACE_HIERARCHY) { 6630 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6631 } 6632 6633 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6634 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 6635 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6636 final ViewParent p = mParent; 6637 final AttachInfo ai = mAttachInfo; 6638 if (p != null && ai != null && ai.mHardwareAccelerated) { 6639 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6640 // with a null dirty rect, which tells the ViewRoot to redraw everything 6641 p.invalidateChild(this, null); 6642 return; 6643 } 6644 if (p != null && ai != null) { 6645 final int scrollX = mScrollX; 6646 final int scrollY = mScrollY; 6647 final Rect r = ai.mTmpInvalRect; 6648 r.set(dirty.left - scrollX, dirty.top - scrollY, 6649 dirty.right - scrollX, dirty.bottom - scrollY); 6650 mParent.invalidateChild(this, r); 6651 } 6652 } 6653 } 6654 6655 /** 6656 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 6657 * The coordinates of the dirty rect are relative to the view. 6658 * If the view is visible, {@link #onDraw} will be called at some point 6659 * in the future. This must be called from a UI thread. To call 6660 * from a non-UI thread, call {@link #postInvalidate()}. 6661 * @param l the left position of the dirty region 6662 * @param t the top position of the dirty region 6663 * @param r the right position of the dirty region 6664 * @param b the bottom position of the dirty region 6665 */ 6666 public void invalidate(int l, int t, int r, int b) { 6667 if (ViewDebug.TRACE_HIERARCHY) { 6668 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6669 } 6670 6671 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6672 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 6673 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6674 final ViewParent p = mParent; 6675 final AttachInfo ai = mAttachInfo; 6676 if (p != null && ai != null && ai.mHardwareAccelerated) { 6677 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6678 // with a null dirty rect, which tells the ViewRoot to redraw everything 6679 p.invalidateChild(this, null); 6680 return; 6681 } 6682 if (p != null && ai != null && l < r && t < b) { 6683 final int scrollX = mScrollX; 6684 final int scrollY = mScrollY; 6685 final Rect tmpr = ai.mTmpInvalRect; 6686 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 6687 p.invalidateChild(this, tmpr); 6688 } 6689 } 6690 } 6691 6692 /** 6693 * Invalidate the whole view. If the view is visible, {@link #onDraw} will 6694 * be called at some point in the future. This must be called from a 6695 * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 6696 */ 6697 public void invalidate() { 6698 invalidate(true); 6699 } 6700 6701 /** 6702 * This is where the invalidate() work actually happens. A full invalidate() 6703 * causes the drawing cache to be invalidated, but this function can be called with 6704 * invalidateCache set to false to skip that invalidation step for cases that do not 6705 * need it (for example, a component that remains at the same dimensions with the same 6706 * content). 6707 * 6708 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 6709 * well. This is usually true for a full invalidate, but may be set to false if the 6710 * View's contents or dimensions have not changed. 6711 */ 6712 private void invalidate(boolean invalidateCache) { 6713 if (ViewDebug.TRACE_HIERARCHY) { 6714 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6715 } 6716 6717 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6718 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID)) { 6719 mPrivateFlags &= ~DRAWN; 6720 if (invalidateCache) { 6721 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6722 } 6723 final AttachInfo ai = mAttachInfo; 6724 final ViewParent p = mParent; 6725 if (p != null && ai != null && ai.mHardwareAccelerated) { 6726 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6727 // with a null dirty rect, which tells the ViewRoot to redraw everything 6728 p.invalidateChild(this, null); 6729 return; 6730 } 6731 6732 if (p != null && ai != null) { 6733 final Rect r = ai.mTmpInvalRect; 6734 r.set(0, 0, mRight - mLeft, mBottom - mTop); 6735 // Don't call invalidate -- we don't want to internally scroll 6736 // our own bounds 6737 p.invalidateChild(this, r); 6738 } 6739 } 6740 } 6741 6742 /** 6743 * Indicates whether this View is opaque. An opaque View guarantees that it will 6744 * draw all the pixels overlapping its bounds using a fully opaque color. 6745 * 6746 * Subclasses of View should override this method whenever possible to indicate 6747 * whether an instance is opaque. Opaque Views are treated in a special way by 6748 * the View hierarchy, possibly allowing it to perform optimizations during 6749 * invalidate/draw passes. 6750 * 6751 * @return True if this View is guaranteed to be fully opaque, false otherwise. 6752 */ 6753 @ViewDebug.ExportedProperty(category = "drawing") 6754 public boolean isOpaque() { 6755 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 6756 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 6757 } 6758 6759 /** 6760 * @hide 6761 */ 6762 protected void computeOpaqueFlags() { 6763 // Opaque if: 6764 // - Has a background 6765 // - Background is opaque 6766 // - Doesn't have scrollbars or scrollbars are inside overlay 6767 6768 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 6769 mPrivateFlags |= OPAQUE_BACKGROUND; 6770 } else { 6771 mPrivateFlags &= ~OPAQUE_BACKGROUND; 6772 } 6773 6774 final int flags = mViewFlags; 6775 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 6776 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 6777 mPrivateFlags |= OPAQUE_SCROLLBARS; 6778 } else { 6779 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 6780 } 6781 } 6782 6783 /** 6784 * @hide 6785 */ 6786 protected boolean hasOpaqueScrollbars() { 6787 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 6788 } 6789 6790 /** 6791 * @return A handler associated with the thread running the View. This 6792 * handler can be used to pump events in the UI events queue. 6793 */ 6794 public Handler getHandler() { 6795 if (mAttachInfo != null) { 6796 return mAttachInfo.mHandler; 6797 } 6798 return null; 6799 } 6800 6801 /** 6802 * Causes the Runnable to be added to the message queue. 6803 * The runnable will be run on the user interface thread. 6804 * 6805 * @param action The Runnable that will be executed. 6806 * 6807 * @return Returns true if the Runnable was successfully placed in to the 6808 * message queue. Returns false on failure, usually because the 6809 * looper processing the message queue is exiting. 6810 */ 6811 public boolean post(Runnable action) { 6812 Handler handler; 6813 if (mAttachInfo != null) { 6814 handler = mAttachInfo.mHandler; 6815 } else { 6816 // Assume that post will succeed later 6817 ViewRoot.getRunQueue().post(action); 6818 return true; 6819 } 6820 6821 return handler.post(action); 6822 } 6823 6824 /** 6825 * Causes the Runnable to be added to the message queue, to be run 6826 * after the specified amount of time elapses. 6827 * The runnable will be run on the user interface thread. 6828 * 6829 * @param action The Runnable that will be executed. 6830 * @param delayMillis The delay (in milliseconds) until the Runnable 6831 * will be executed. 6832 * 6833 * @return true if the Runnable was successfully placed in to the 6834 * message queue. Returns false on failure, usually because the 6835 * looper processing the message queue is exiting. Note that a 6836 * result of true does not mean the Runnable will be processed -- 6837 * if the looper is quit before the delivery time of the message 6838 * occurs then the message will be dropped. 6839 */ 6840 public boolean postDelayed(Runnable action, long delayMillis) { 6841 Handler handler; 6842 if (mAttachInfo != null) { 6843 handler = mAttachInfo.mHandler; 6844 } else { 6845 // Assume that post will succeed later 6846 ViewRoot.getRunQueue().postDelayed(action, delayMillis); 6847 return true; 6848 } 6849 6850 return handler.postDelayed(action, delayMillis); 6851 } 6852 6853 /** 6854 * Removes the specified Runnable from the message queue. 6855 * 6856 * @param action The Runnable to remove from the message handling queue 6857 * 6858 * @return true if this view could ask the Handler to remove the Runnable, 6859 * false otherwise. When the returned value is true, the Runnable 6860 * may or may not have been actually removed from the message queue 6861 * (for instance, if the Runnable was not in the queue already.) 6862 */ 6863 public boolean removeCallbacks(Runnable action) { 6864 Handler handler; 6865 if (mAttachInfo != null) { 6866 handler = mAttachInfo.mHandler; 6867 } else { 6868 // Assume that post will succeed later 6869 ViewRoot.getRunQueue().removeCallbacks(action); 6870 return true; 6871 } 6872 6873 handler.removeCallbacks(action); 6874 return true; 6875 } 6876 6877 /** 6878 * Cause an invalidate to happen on a subsequent cycle through the event loop. 6879 * Use this to invalidate the View from a non-UI thread. 6880 * 6881 * @see #invalidate() 6882 */ 6883 public void postInvalidate() { 6884 postInvalidateDelayed(0); 6885 } 6886 6887 /** 6888 * Cause an invalidate of the specified area to happen on a subsequent cycle 6889 * through the event loop. Use this to invalidate the View from a non-UI thread. 6890 * 6891 * @param left The left coordinate of the rectangle to invalidate. 6892 * @param top The top coordinate of the rectangle to invalidate. 6893 * @param right The right coordinate of the rectangle to invalidate. 6894 * @param bottom The bottom coordinate of the rectangle to invalidate. 6895 * 6896 * @see #invalidate(int, int, int, int) 6897 * @see #invalidate(Rect) 6898 */ 6899 public void postInvalidate(int left, int top, int right, int bottom) { 6900 postInvalidateDelayed(0, left, top, right, bottom); 6901 } 6902 6903 /** 6904 * Cause an invalidate to happen on a subsequent cycle through the event 6905 * loop. Waits for the specified amount of time. 6906 * 6907 * @param delayMilliseconds the duration in milliseconds to delay the 6908 * invalidation by 6909 */ 6910 public void postInvalidateDelayed(long delayMilliseconds) { 6911 // We try only with the AttachInfo because there's no point in invalidating 6912 // if we are not attached to our window 6913 if (mAttachInfo != null) { 6914 Message msg = Message.obtain(); 6915 msg.what = AttachInfo.INVALIDATE_MSG; 6916 msg.obj = this; 6917 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6918 } 6919 } 6920 6921 /** 6922 * Cause an invalidate of the specified area to happen on a subsequent cycle 6923 * through the event loop. Waits for the specified amount of time. 6924 * 6925 * @param delayMilliseconds the duration in milliseconds to delay the 6926 * invalidation by 6927 * @param left The left coordinate of the rectangle to invalidate. 6928 * @param top The top coordinate of the rectangle to invalidate. 6929 * @param right The right coordinate of the rectangle to invalidate. 6930 * @param bottom The bottom coordinate of the rectangle to invalidate. 6931 */ 6932 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 6933 int right, int bottom) { 6934 6935 // We try only with the AttachInfo because there's no point in invalidating 6936 // if we are not attached to our window 6937 if (mAttachInfo != null) { 6938 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 6939 info.target = this; 6940 info.left = left; 6941 info.top = top; 6942 info.right = right; 6943 info.bottom = bottom; 6944 6945 final Message msg = Message.obtain(); 6946 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 6947 msg.obj = info; 6948 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6949 } 6950 } 6951 6952 /** 6953 * Called by a parent to request that a child update its values for mScrollX 6954 * and mScrollY if necessary. This will typically be done if the child is 6955 * animating a scroll using a {@link android.widget.Scroller Scroller} 6956 * object. 6957 */ 6958 public void computeScroll() { 6959 } 6960 6961 /** 6962 * <p>Indicate whether the horizontal edges are faded when the view is 6963 * scrolled horizontally.</p> 6964 * 6965 * @return true if the horizontal edges should are faded on scroll, false 6966 * otherwise 6967 * 6968 * @see #setHorizontalFadingEdgeEnabled(boolean) 6969 * @attr ref android.R.styleable#View_fadingEdge 6970 */ 6971 public boolean isHorizontalFadingEdgeEnabled() { 6972 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 6973 } 6974 6975 /** 6976 * <p>Define whether the horizontal edges should be faded when this view 6977 * is scrolled horizontally.</p> 6978 * 6979 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 6980 * be faded when the view is scrolled 6981 * horizontally 6982 * 6983 * @see #isHorizontalFadingEdgeEnabled() 6984 * @attr ref android.R.styleable#View_fadingEdge 6985 */ 6986 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 6987 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 6988 if (horizontalFadingEdgeEnabled) { 6989 initScrollCache(); 6990 } 6991 6992 mViewFlags ^= FADING_EDGE_HORIZONTAL; 6993 } 6994 } 6995 6996 /** 6997 * <p>Indicate whether the vertical edges are faded when the view is 6998 * scrolled horizontally.</p> 6999 * 7000 * @return true if the vertical edges should are faded on scroll, false 7001 * otherwise 7002 * 7003 * @see #setVerticalFadingEdgeEnabled(boolean) 7004 * @attr ref android.R.styleable#View_fadingEdge 7005 */ 7006 public boolean isVerticalFadingEdgeEnabled() { 7007 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 7008 } 7009 7010 /** 7011 * <p>Define whether the vertical edges should be faded when this view 7012 * is scrolled vertically.</p> 7013 * 7014 * @param verticalFadingEdgeEnabled true if the vertical edges should 7015 * be faded when the view is scrolled 7016 * vertically 7017 * 7018 * @see #isVerticalFadingEdgeEnabled() 7019 * @attr ref android.R.styleable#View_fadingEdge 7020 */ 7021 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 7022 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 7023 if (verticalFadingEdgeEnabled) { 7024 initScrollCache(); 7025 } 7026 7027 mViewFlags ^= FADING_EDGE_VERTICAL; 7028 } 7029 } 7030 7031 /** 7032 * Returns the strength, or intensity, of the top faded edge. The strength is 7033 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7034 * returns 0.0 or 1.0 but no value in between. 7035 * 7036 * Subclasses should override this method to provide a smoother fade transition 7037 * when scrolling occurs. 7038 * 7039 * @return the intensity of the top fade as a float between 0.0f and 1.0f 7040 */ 7041 protected float getTopFadingEdgeStrength() { 7042 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 7043 } 7044 7045 /** 7046 * Returns the strength, or intensity, of the bottom faded edge. The strength is 7047 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7048 * returns 0.0 or 1.0 but no value in between. 7049 * 7050 * Subclasses should override this method to provide a smoother fade transition 7051 * when scrolling occurs. 7052 * 7053 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 7054 */ 7055 protected float getBottomFadingEdgeStrength() { 7056 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 7057 computeVerticalScrollRange() ? 1.0f : 0.0f; 7058 } 7059 7060 /** 7061 * Returns the strength, or intensity, of the left faded edge. The strength is 7062 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7063 * returns 0.0 or 1.0 but no value in between. 7064 * 7065 * Subclasses should override this method to provide a smoother fade transition 7066 * when scrolling occurs. 7067 * 7068 * @return the intensity of the left fade as a float between 0.0f and 1.0f 7069 */ 7070 protected float getLeftFadingEdgeStrength() { 7071 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 7072 } 7073 7074 /** 7075 * Returns the strength, or intensity, of the right faded edge. The strength is 7076 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7077 * returns 0.0 or 1.0 but no value in between. 7078 * 7079 * Subclasses should override this method to provide a smoother fade transition 7080 * when scrolling occurs. 7081 * 7082 * @return the intensity of the right fade as a float between 0.0f and 1.0f 7083 */ 7084 protected float getRightFadingEdgeStrength() { 7085 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 7086 computeHorizontalScrollRange() ? 1.0f : 0.0f; 7087 } 7088 7089 /** 7090 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 7091 * scrollbar is not drawn by default.</p> 7092 * 7093 * @return true if the horizontal scrollbar should be painted, false 7094 * otherwise 7095 * 7096 * @see #setHorizontalScrollBarEnabled(boolean) 7097 */ 7098 public boolean isHorizontalScrollBarEnabled() { 7099 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7100 } 7101 7102 /** 7103 * <p>Define whether the horizontal scrollbar should be drawn or not. The 7104 * scrollbar is not drawn by default.</p> 7105 * 7106 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 7107 * be painted 7108 * 7109 * @see #isHorizontalScrollBarEnabled() 7110 */ 7111 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 7112 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 7113 mViewFlags ^= SCROLLBARS_HORIZONTAL; 7114 computeOpaqueFlags(); 7115 recomputePadding(); 7116 } 7117 } 7118 7119 /** 7120 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 7121 * scrollbar is not drawn by default.</p> 7122 * 7123 * @return true if the vertical scrollbar should be painted, false 7124 * otherwise 7125 * 7126 * @see #setVerticalScrollBarEnabled(boolean) 7127 */ 7128 public boolean isVerticalScrollBarEnabled() { 7129 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 7130 } 7131 7132 /** 7133 * <p>Define whether the vertical scrollbar should be drawn or not. The 7134 * scrollbar is not drawn by default.</p> 7135 * 7136 * @param verticalScrollBarEnabled true if the vertical scrollbar should 7137 * be painted 7138 * 7139 * @see #isVerticalScrollBarEnabled() 7140 */ 7141 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 7142 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 7143 mViewFlags ^= SCROLLBARS_VERTICAL; 7144 computeOpaqueFlags(); 7145 recomputePadding(); 7146 } 7147 } 7148 7149 /** 7150 * @hide 7151 */ 7152 protected void recomputePadding() { 7153 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 7154 } 7155 7156 /** 7157 * Define whether scrollbars will fade when the view is not scrolling. 7158 * 7159 * @param fadeScrollbars wheter to enable fading 7160 * 7161 */ 7162 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 7163 initScrollCache(); 7164 final ScrollabilityCache scrollabilityCache = mScrollCache; 7165 scrollabilityCache.fadeScrollBars = fadeScrollbars; 7166 if (fadeScrollbars) { 7167 scrollabilityCache.state = ScrollabilityCache.OFF; 7168 } else { 7169 scrollabilityCache.state = ScrollabilityCache.ON; 7170 } 7171 } 7172 7173 /** 7174 * 7175 * Returns true if scrollbars will fade when this view is not scrolling 7176 * 7177 * @return true if scrollbar fading is enabled 7178 */ 7179 public boolean isScrollbarFadingEnabled() { 7180 return mScrollCache != null && mScrollCache.fadeScrollBars; 7181 } 7182 7183 /** 7184 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 7185 * inset. When inset, they add to the padding of the view. And the scrollbars 7186 * can be drawn inside the padding area or on the edge of the view. For example, 7187 * if a view has a background drawable and you want to draw the scrollbars 7188 * inside the padding specified by the drawable, you can use 7189 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 7190 * appear at the edge of the view, ignoring the padding, then you can use 7191 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 7192 * @param style the style of the scrollbars. Should be one of 7193 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 7194 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 7195 * @see #SCROLLBARS_INSIDE_OVERLAY 7196 * @see #SCROLLBARS_INSIDE_INSET 7197 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7198 * @see #SCROLLBARS_OUTSIDE_INSET 7199 */ 7200 public void setScrollBarStyle(int style) { 7201 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 7202 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 7203 computeOpaqueFlags(); 7204 recomputePadding(); 7205 } 7206 } 7207 7208 /** 7209 * <p>Returns the current scrollbar style.</p> 7210 * @return the current scrollbar style 7211 * @see #SCROLLBARS_INSIDE_OVERLAY 7212 * @see #SCROLLBARS_INSIDE_INSET 7213 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7214 * @see #SCROLLBARS_OUTSIDE_INSET 7215 */ 7216 public int getScrollBarStyle() { 7217 return mViewFlags & SCROLLBARS_STYLE_MASK; 7218 } 7219 7220 /** 7221 * <p>Compute the horizontal range that the horizontal scrollbar 7222 * represents.</p> 7223 * 7224 * <p>The range is expressed in arbitrary units that must be the same as the 7225 * units used by {@link #computeHorizontalScrollExtent()} and 7226 * {@link #computeHorizontalScrollOffset()}.</p> 7227 * 7228 * <p>The default range is the drawing width of this view.</p> 7229 * 7230 * @return the total horizontal range represented by the horizontal 7231 * scrollbar 7232 * 7233 * @see #computeHorizontalScrollExtent() 7234 * @see #computeHorizontalScrollOffset() 7235 * @see android.widget.ScrollBarDrawable 7236 */ 7237 protected int computeHorizontalScrollRange() { 7238 return getWidth(); 7239 } 7240 7241 /** 7242 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 7243 * within the horizontal range. This value is used to compute the position 7244 * of the thumb within the scrollbar's track.</p> 7245 * 7246 * <p>The range is expressed in arbitrary units that must be the same as the 7247 * units used by {@link #computeHorizontalScrollRange()} and 7248 * {@link #computeHorizontalScrollExtent()}.</p> 7249 * 7250 * <p>The default offset is the scroll offset of this view.</p> 7251 * 7252 * @return the horizontal offset of the scrollbar's thumb 7253 * 7254 * @see #computeHorizontalScrollRange() 7255 * @see #computeHorizontalScrollExtent() 7256 * @see android.widget.ScrollBarDrawable 7257 */ 7258 protected int computeHorizontalScrollOffset() { 7259 return mScrollX; 7260 } 7261 7262 /** 7263 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 7264 * within the horizontal range. This value is used to compute the length 7265 * of the thumb within the scrollbar's track.</p> 7266 * 7267 * <p>The range is expressed in arbitrary units that must be the same as the 7268 * units used by {@link #computeHorizontalScrollRange()} and 7269 * {@link #computeHorizontalScrollOffset()}.</p> 7270 * 7271 * <p>The default extent is the drawing width of this view.</p> 7272 * 7273 * @return the horizontal extent of the scrollbar's thumb 7274 * 7275 * @see #computeHorizontalScrollRange() 7276 * @see #computeHorizontalScrollOffset() 7277 * @see android.widget.ScrollBarDrawable 7278 */ 7279 protected int computeHorizontalScrollExtent() { 7280 return getWidth(); 7281 } 7282 7283 /** 7284 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 7285 * 7286 * <p>The range is expressed in arbitrary units that must be the same as the 7287 * units used by {@link #computeVerticalScrollExtent()} and 7288 * {@link #computeVerticalScrollOffset()}.</p> 7289 * 7290 * @return the total vertical range represented by the vertical scrollbar 7291 * 7292 * <p>The default range is the drawing height of this view.</p> 7293 * 7294 * @see #computeVerticalScrollExtent() 7295 * @see #computeVerticalScrollOffset() 7296 * @see android.widget.ScrollBarDrawable 7297 */ 7298 protected int computeVerticalScrollRange() { 7299 return getHeight(); 7300 } 7301 7302 /** 7303 * <p>Compute the vertical offset of the vertical scrollbar's thumb 7304 * within the horizontal range. This value is used to compute the position 7305 * of the thumb within the scrollbar's track.</p> 7306 * 7307 * <p>The range is expressed in arbitrary units that must be the same as the 7308 * units used by {@link #computeVerticalScrollRange()} and 7309 * {@link #computeVerticalScrollExtent()}.</p> 7310 * 7311 * <p>The default offset is the scroll offset of this view.</p> 7312 * 7313 * @return the vertical offset of the scrollbar's thumb 7314 * 7315 * @see #computeVerticalScrollRange() 7316 * @see #computeVerticalScrollExtent() 7317 * @see android.widget.ScrollBarDrawable 7318 */ 7319 protected int computeVerticalScrollOffset() { 7320 return mScrollY; 7321 } 7322 7323 /** 7324 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 7325 * within the vertical range. This value is used to compute the length 7326 * of the thumb within the scrollbar's track.</p> 7327 * 7328 * <p>The range is expressed in arbitrary units that must be the same as the 7329 * units used by {@link #computeVerticalScrollRange()} and 7330 * {@link #computeVerticalScrollOffset()}.</p> 7331 * 7332 * <p>The default extent is the drawing height of this view.</p> 7333 * 7334 * @return the vertical extent of the scrollbar's thumb 7335 * 7336 * @see #computeVerticalScrollRange() 7337 * @see #computeVerticalScrollOffset() 7338 * @see android.widget.ScrollBarDrawable 7339 */ 7340 protected int computeVerticalScrollExtent() { 7341 return getHeight(); 7342 } 7343 7344 /** 7345 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 7346 * scrollbars are painted only if they have been awakened first.</p> 7347 * 7348 * @param canvas the canvas on which to draw the scrollbars 7349 * 7350 * @see #awakenScrollBars(int) 7351 */ 7352 protected final void onDrawScrollBars(Canvas canvas) { 7353 // scrollbars are drawn only when the animation is running 7354 final ScrollabilityCache cache = mScrollCache; 7355 if (cache != null) { 7356 7357 int state = cache.state; 7358 7359 if (state == ScrollabilityCache.OFF) { 7360 return; 7361 } 7362 7363 boolean invalidate = false; 7364 7365 if (state == ScrollabilityCache.FADING) { 7366 // We're fading -- get our fade interpolation 7367 if (cache.interpolatorValues == null) { 7368 cache.interpolatorValues = new float[1]; 7369 } 7370 7371 float[] values = cache.interpolatorValues; 7372 7373 // Stops the animation if we're done 7374 if (cache.scrollBarInterpolator.timeToValues(values) == 7375 Interpolator.Result.FREEZE_END) { 7376 cache.state = ScrollabilityCache.OFF; 7377 } else { 7378 cache.scrollBar.setAlpha(Math.round(values[0])); 7379 } 7380 7381 // This will make the scroll bars inval themselves after 7382 // drawing. We only want this when we're fading so that 7383 // we prevent excessive redraws 7384 invalidate = true; 7385 } else { 7386 // We're just on -- but we may have been fading before so 7387 // reset alpha 7388 cache.scrollBar.setAlpha(255); 7389 } 7390 7391 7392 final int viewFlags = mViewFlags; 7393 7394 final boolean drawHorizontalScrollBar = 7395 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7396 final boolean drawVerticalScrollBar = 7397 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 7398 && !isVerticalScrollBarHidden(); 7399 7400 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 7401 final int width = mRight - mLeft; 7402 final int height = mBottom - mTop; 7403 7404 final ScrollBarDrawable scrollBar = cache.scrollBar; 7405 int size = scrollBar.getSize(false); 7406 if (size <= 0) { 7407 size = cache.scrollBarSize; 7408 } 7409 7410 final int scrollX = mScrollX; 7411 final int scrollY = mScrollY; 7412 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 7413 7414 int left, top, right, bottom; 7415 7416 if (drawHorizontalScrollBar) { 7417 scrollBar.setParameters(computeHorizontalScrollRange(), 7418 computeHorizontalScrollOffset(), 7419 computeHorizontalScrollExtent(), false); 7420 final int verticalScrollBarGap = drawVerticalScrollBar ? 7421 getVerticalScrollbarWidth() : 0; 7422 top = scrollY + height - size - (mUserPaddingBottom & inside); 7423 left = scrollX + (mPaddingLeft & inside); 7424 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 7425 bottom = top + size; 7426 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 7427 if (invalidate) { 7428 invalidate(left, top, right, bottom); 7429 } 7430 } 7431 7432 if (drawVerticalScrollBar) { 7433 scrollBar.setParameters(computeVerticalScrollRange(), 7434 computeVerticalScrollOffset(), 7435 computeVerticalScrollExtent(), true); 7436 switch (mVerticalScrollbarPosition) { 7437 default: 7438 case SCROLLBAR_POSITION_DEFAULT: 7439 case SCROLLBAR_POSITION_RIGHT: 7440 left = scrollX + width - size - (mUserPaddingRight & inside); 7441 break; 7442 case SCROLLBAR_POSITION_LEFT: 7443 left = scrollX + (mUserPaddingLeft & inside); 7444 break; 7445 } 7446 top = scrollY + (mPaddingTop & inside); 7447 right = left + size; 7448 bottom = scrollY + height - (mUserPaddingBottom & inside); 7449 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 7450 if (invalidate) { 7451 invalidate(left, top, right, bottom); 7452 } 7453 } 7454 } 7455 } 7456 } 7457 7458 /** 7459 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 7460 * FastScroller is visible. 7461 * @return whether to temporarily hide the vertical scrollbar 7462 * @hide 7463 */ 7464 protected boolean isVerticalScrollBarHidden() { 7465 return false; 7466 } 7467 7468 /** 7469 * <p>Draw the horizontal scrollbar if 7470 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 7471 * 7472 * @param canvas the canvas on which to draw the scrollbar 7473 * @param scrollBar the scrollbar's drawable 7474 * 7475 * @see #isHorizontalScrollBarEnabled() 7476 * @see #computeHorizontalScrollRange() 7477 * @see #computeHorizontalScrollExtent() 7478 * @see #computeHorizontalScrollOffset() 7479 * @see android.widget.ScrollBarDrawable 7480 * @hide 7481 */ 7482 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 7483 int l, int t, int r, int b) { 7484 scrollBar.setBounds(l, t, r, b); 7485 scrollBar.draw(canvas); 7486 } 7487 7488 /** 7489 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 7490 * returns true.</p> 7491 * 7492 * @param canvas the canvas on which to draw the scrollbar 7493 * @param scrollBar the scrollbar's drawable 7494 * 7495 * @see #isVerticalScrollBarEnabled() 7496 * @see #computeVerticalScrollRange() 7497 * @see #computeVerticalScrollExtent() 7498 * @see #computeVerticalScrollOffset() 7499 * @see android.widget.ScrollBarDrawable 7500 * @hide 7501 */ 7502 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 7503 int l, int t, int r, int b) { 7504 scrollBar.setBounds(l, t, r, b); 7505 scrollBar.draw(canvas); 7506 } 7507 7508 /** 7509 * Implement this to do your drawing. 7510 * 7511 * @param canvas the canvas on which the background will be drawn 7512 */ 7513 protected void onDraw(Canvas canvas) { 7514 } 7515 7516 /* 7517 * Caller is responsible for calling requestLayout if necessary. 7518 * (This allows addViewInLayout to not request a new layout.) 7519 */ 7520 void assignParent(ViewParent parent) { 7521 if (mParent == null) { 7522 mParent = parent; 7523 } else if (parent == null) { 7524 mParent = null; 7525 } else { 7526 throw new RuntimeException("view " + this + " being added, but" 7527 + " it already has a parent"); 7528 } 7529 } 7530 7531 /** 7532 * This is called when the view is attached to a window. At this point it 7533 * has a Surface and will start drawing. Note that this function is 7534 * guaranteed to be called before {@link #onDraw}, however it may be called 7535 * any time before the first onDraw -- including before or after 7536 * {@link #onMeasure}. 7537 * 7538 * @see #onDetachedFromWindow() 7539 */ 7540 protected void onAttachedToWindow() { 7541 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 7542 mParent.requestTransparentRegion(this); 7543 } 7544 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 7545 initialAwakenScrollBars(); 7546 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 7547 } 7548 jumpDrawablesToCurrentState(); 7549 } 7550 7551 /** 7552 * This is called when the view is detached from a window. At this point it 7553 * no longer has a surface for drawing. 7554 * 7555 * @see #onAttachedToWindow() 7556 */ 7557 protected void onDetachedFromWindow() { 7558 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 7559 7560 removeUnsetPressCallback(); 7561 removeLongPressCallback(); 7562 7563 destroyDrawingCache(); 7564 7565 if (mHardwareLayer != null) { 7566 mHardwareLayer.destroy(); 7567 mHardwareLayer = null; 7568 } 7569 } 7570 7571 /** 7572 * @return The number of times this view has been attached to a window 7573 */ 7574 protected int getWindowAttachCount() { 7575 return mWindowAttachCount; 7576 } 7577 7578 /** 7579 * Retrieve a unique token identifying the window this view is attached to. 7580 * @return Return the window's token for use in 7581 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 7582 */ 7583 public IBinder getWindowToken() { 7584 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 7585 } 7586 7587 /** 7588 * Retrieve a unique token identifying the top-level "real" window of 7589 * the window that this view is attached to. That is, this is like 7590 * {@link #getWindowToken}, except if the window this view in is a panel 7591 * window (attached to another containing window), then the token of 7592 * the containing window is returned instead. 7593 * 7594 * @return Returns the associated window token, either 7595 * {@link #getWindowToken()} or the containing window's token. 7596 */ 7597 public IBinder getApplicationWindowToken() { 7598 AttachInfo ai = mAttachInfo; 7599 if (ai != null) { 7600 IBinder appWindowToken = ai.mPanelParentWindowToken; 7601 if (appWindowToken == null) { 7602 appWindowToken = ai.mWindowToken; 7603 } 7604 return appWindowToken; 7605 } 7606 return null; 7607 } 7608 7609 /** 7610 * Retrieve private session object this view hierarchy is using to 7611 * communicate with the window manager. 7612 * @return the session object to communicate with the window manager 7613 */ 7614 /*package*/ IWindowSession getWindowSession() { 7615 return mAttachInfo != null ? mAttachInfo.mSession : null; 7616 } 7617 7618 /** 7619 * @param info the {@link android.view.View.AttachInfo} to associated with 7620 * this view 7621 */ 7622 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 7623 //System.out.println("Attached! " + this); 7624 mAttachInfo = info; 7625 mWindowAttachCount++; 7626 // We will need to evaluate the drawable state at least once. 7627 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 7628 if (mFloatingTreeObserver != null) { 7629 info.mTreeObserver.merge(mFloatingTreeObserver); 7630 mFloatingTreeObserver = null; 7631 } 7632 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 7633 mAttachInfo.mScrollContainers.add(this); 7634 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 7635 } 7636 performCollectViewAttributes(visibility); 7637 onAttachedToWindow(); 7638 int vis = info.mWindowVisibility; 7639 if (vis != GONE) { 7640 onWindowVisibilityChanged(vis); 7641 } 7642 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 7643 // If nobody has evaluated the drawable state yet, then do it now. 7644 refreshDrawableState(); 7645 } 7646 } 7647 7648 void dispatchDetachedFromWindow() { 7649 //System.out.println("Detached! " + this); 7650 AttachInfo info = mAttachInfo; 7651 if (info != null) { 7652 int vis = info.mWindowVisibility; 7653 if (vis != GONE) { 7654 onWindowVisibilityChanged(GONE); 7655 } 7656 } 7657 7658 onDetachedFromWindow(); 7659 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 7660 mAttachInfo.mScrollContainers.remove(this); 7661 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 7662 } 7663 mAttachInfo = null; 7664 } 7665 7666 /** 7667 * Store this view hierarchy's frozen state into the given container. 7668 * 7669 * @param container The SparseArray in which to save the view's state. 7670 * 7671 * @see #restoreHierarchyState 7672 * @see #dispatchSaveInstanceState 7673 * @see #onSaveInstanceState 7674 */ 7675 public void saveHierarchyState(SparseArray<Parcelable> container) { 7676 dispatchSaveInstanceState(container); 7677 } 7678 7679 /** 7680 * Called by {@link #saveHierarchyState} to store the state for this view and its children. 7681 * May be overridden to modify how freezing happens to a view's children; for example, some 7682 * views may want to not store state for their children. 7683 * 7684 * @param container The SparseArray in which to save the view's state. 7685 * 7686 * @see #dispatchRestoreInstanceState 7687 * @see #saveHierarchyState 7688 * @see #onSaveInstanceState 7689 */ 7690 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 7691 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 7692 mPrivateFlags &= ~SAVE_STATE_CALLED; 7693 Parcelable state = onSaveInstanceState(); 7694 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7695 throw new IllegalStateException( 7696 "Derived class did not call super.onSaveInstanceState()"); 7697 } 7698 if (state != null) { 7699 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 7700 // + ": " + state); 7701 container.put(mID, state); 7702 } 7703 } 7704 } 7705 7706 /** 7707 * Hook allowing a view to generate a representation of its internal state 7708 * that can later be used to create a new instance with that same state. 7709 * This state should only contain information that is not persistent or can 7710 * not be reconstructed later. For example, you will never store your 7711 * current position on screen because that will be computed again when a 7712 * new instance of the view is placed in its view hierarchy. 7713 * <p> 7714 * Some examples of things you may store here: the current cursor position 7715 * in a text view (but usually not the text itself since that is stored in a 7716 * content provider or other persistent storage), the currently selected 7717 * item in a list view. 7718 * 7719 * @return Returns a Parcelable object containing the view's current dynamic 7720 * state, or null if there is nothing interesting to save. The 7721 * default implementation returns null. 7722 * @see #onRestoreInstanceState 7723 * @see #saveHierarchyState 7724 * @see #dispatchSaveInstanceState 7725 * @see #setSaveEnabled(boolean) 7726 */ 7727 protected Parcelable onSaveInstanceState() { 7728 mPrivateFlags |= SAVE_STATE_CALLED; 7729 return BaseSavedState.EMPTY_STATE; 7730 } 7731 7732 /** 7733 * Restore this view hierarchy's frozen state from the given container. 7734 * 7735 * @param container The SparseArray which holds previously frozen states. 7736 * 7737 * @see #saveHierarchyState 7738 * @see #dispatchRestoreInstanceState 7739 * @see #onRestoreInstanceState 7740 */ 7741 public void restoreHierarchyState(SparseArray<Parcelable> container) { 7742 dispatchRestoreInstanceState(container); 7743 } 7744 7745 /** 7746 * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its 7747 * children. May be overridden to modify how restoreing happens to a view's children; for 7748 * example, some views may want to not store state for their children. 7749 * 7750 * @param container The SparseArray which holds previously saved state. 7751 * 7752 * @see #dispatchSaveInstanceState 7753 * @see #restoreHierarchyState 7754 * @see #onRestoreInstanceState 7755 */ 7756 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 7757 if (mID != NO_ID) { 7758 Parcelable state = container.get(mID); 7759 if (state != null) { 7760 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 7761 // + ": " + state); 7762 mPrivateFlags &= ~SAVE_STATE_CALLED; 7763 onRestoreInstanceState(state); 7764 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7765 throw new IllegalStateException( 7766 "Derived class did not call super.onRestoreInstanceState()"); 7767 } 7768 } 7769 } 7770 } 7771 7772 /** 7773 * Hook allowing a view to re-apply a representation of its internal state that had previously 7774 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 7775 * null state. 7776 * 7777 * @param state The frozen state that had previously been returned by 7778 * {@link #onSaveInstanceState}. 7779 * 7780 * @see #onSaveInstanceState 7781 * @see #restoreHierarchyState 7782 * @see #dispatchRestoreInstanceState 7783 */ 7784 protected void onRestoreInstanceState(Parcelable state) { 7785 mPrivateFlags |= SAVE_STATE_CALLED; 7786 if (state != BaseSavedState.EMPTY_STATE && state != null) { 7787 throw new IllegalArgumentException("Wrong state class, expecting View State but " 7788 + "received " + state.getClass().toString() + " instead. This usually happens " 7789 + "when two views of different type have the same id in the same hierarchy. " 7790 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 7791 + "other views do not use the same id."); 7792 } 7793 } 7794 7795 /** 7796 * <p>Return the time at which the drawing of the view hierarchy started.</p> 7797 * 7798 * @return the drawing start time in milliseconds 7799 */ 7800 public long getDrawingTime() { 7801 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 7802 } 7803 7804 /** 7805 * <p>Enables or disables the duplication of the parent's state into this view. When 7806 * duplication is enabled, this view gets its drawable state from its parent rather 7807 * than from its own internal properties.</p> 7808 * 7809 * <p>Note: in the current implementation, setting this property to true after the 7810 * view was added to a ViewGroup might have no effect at all. This property should 7811 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 7812 * 7813 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 7814 * property is enabled, an exception will be thrown.</p> 7815 * 7816 * @param enabled True to enable duplication of the parent's drawable state, false 7817 * to disable it. 7818 * 7819 * @see #getDrawableState() 7820 * @see #isDuplicateParentStateEnabled() 7821 */ 7822 public void setDuplicateParentStateEnabled(boolean enabled) { 7823 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 7824 } 7825 7826 /** 7827 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 7828 * 7829 * @return True if this view's drawable state is duplicated from the parent, 7830 * false otherwise 7831 * 7832 * @see #getDrawableState() 7833 * @see #setDuplicateParentStateEnabled(boolean) 7834 */ 7835 public boolean isDuplicateParentStateEnabled() { 7836 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 7837 } 7838 7839 /** 7840 * <p>Specifies the type of layer backing this view. The layer can be 7841 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 7842 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 7843 * 7844 * <p>A layer is associated with an optional {@link android.graphics.Paint} 7845 * instance that controls how the layer is composed on screen. The following 7846 * properties of the paint are taken into account when composing the layer:</p> 7847 * <ul> 7848 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 7849 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 7850 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 7851 * </ul> 7852 * 7853 * <p>If this view has an alpha value set to < 1.0 by calling 7854 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 7855 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 7856 * equivalent to setting a hardware layer on this view and providing a paint with 7857 * the desired alpha value.<p> 7858 * 7859 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 7860 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 7861 * for more information on when and how to use layers.</p> 7862 * 7863 * @param layerType The ype of layer to use with this view, must be one of 7864 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 7865 * {@link #LAYER_TYPE_HARDWARE} 7866 * @param paint The paint used to compose the layer. This argument is optional 7867 * and can be null. It is ignored when the layer type is 7868 * {@link #LAYER_TYPE_NONE} 7869 * 7870 * @see #getLayerType() 7871 * @see #LAYER_TYPE_NONE 7872 * @see #LAYER_TYPE_SOFTWARE 7873 * @see #LAYER_TYPE_HARDWARE 7874 * @see #setAlpha(float) 7875 * 7876 * @attr ref android.R.styleable#View_layerType 7877 */ 7878 public void setLayerType(int layerType, Paint paint) { 7879 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 7880 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 7881 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 7882 } 7883 7884 if (layerType == mLayerType) return; 7885 7886 // Destroy any previous software drawing cache if needed 7887 switch (mLayerType) { 7888 case LAYER_TYPE_SOFTWARE: 7889 if (mDrawingCache != null) { 7890 mDrawingCache.recycle(); 7891 mDrawingCache = null; 7892 } 7893 7894 if (mUnscaledDrawingCache != null) { 7895 mUnscaledDrawingCache.recycle(); 7896 mUnscaledDrawingCache = null; 7897 } 7898 break; 7899 case LAYER_TYPE_HARDWARE: 7900 if (mHardwareLayer != null) { 7901 mHardwareLayer.destroy(); 7902 mHardwareLayer = null; 7903 } 7904 break; 7905 default: 7906 break; 7907 } 7908 7909 mLayerType = layerType; 7910 mLayerPaint = mLayerType == LAYER_TYPE_NONE ? null : paint; 7911 7912 // TODO: Make sure we invalidate the parent's display list 7913 invalidate(); 7914 } 7915 7916 /** 7917 * Indicates what type of layer is currently associated with this view. By default 7918 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 7919 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 7920 * for more information on the different types of layers. 7921 * 7922 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 7923 * {@link #LAYER_TYPE_HARDWARE} 7924 * 7925 * @see #setLayerType(int, android.graphics.Paint) 7926 * @see #LAYER_TYPE_NONE 7927 * @see #LAYER_TYPE_SOFTWARE 7928 * @see #LAYER_TYPE_HARDWARE 7929 */ 7930 public int getLayerType() { 7931 return mLayerType; 7932 } 7933 7934 /** 7935 * <p>Returns a hardware layer that can be used to draw this view again 7936 * without executing its draw method.</p> 7937 * 7938 * @return A HardwareLayer ready to render, or null if an error occurred. 7939 */ 7940 HardwareLayer getHardwareLayer(Canvas currentCanvas) { 7941 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 7942 return null; 7943 } 7944 7945 final int width = mRight - mLeft; 7946 final int height = mBottom - mTop; 7947 7948 if (width == 0 || height == 0) { 7949 return null; 7950 } 7951 7952 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 7953 if (mHardwareLayer == null) { 7954 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 7955 width, height, isOpaque()); 7956 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 7957 mHardwareLayer.resize(width, height); 7958 } 7959 7960 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 7961 try { 7962 canvas.setViewport(width, height); 7963 canvas.onPreDraw(); 7964 7965 computeScroll(); 7966 canvas.translate(-mScrollX, -mScrollY); 7967 7968 final int restoreCount = canvas.save(); 7969 7970 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 7971 7972 // Fast path for layouts with no backgrounds 7973 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 7974 mPrivateFlags &= ~DIRTY_MASK; 7975 dispatchDraw(canvas); 7976 } else { 7977 draw(canvas); 7978 } 7979 7980 canvas.restoreToCount(restoreCount); 7981 } finally { 7982 canvas.onPostDraw(); 7983 mHardwareLayer.end(currentCanvas); 7984 } 7985 } 7986 7987 return mHardwareLayer; 7988 } 7989 7990 /** 7991 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 7992 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 7993 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 7994 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 7995 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 7996 * null.</p> 7997 * 7998 * <p>Enabling the drawing cache is similar to 7999 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 8000 * acceleration is turned off. When hardware acceleration is turned on enabling the 8001 * drawing cache has either no effect or the cache used at drawing time is not a bitmap. 8002 * This API can however be used to manually generate a bitmap copy of this view.</p> 8003 * 8004 * @param enabled true to enable the drawing cache, false otherwise 8005 * 8006 * @see #isDrawingCacheEnabled() 8007 * @see #getDrawingCache() 8008 * @see #buildDrawingCache() 8009 * @see #setLayerType(int, android.graphics.Paint) 8010 */ 8011 public void setDrawingCacheEnabled(boolean enabled) { 8012 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 8013 } 8014 8015 /** 8016 * <p>Indicates whether the drawing cache is enabled for this view.</p> 8017 * 8018 * @return true if the drawing cache is enabled 8019 * 8020 * @see #setDrawingCacheEnabled(boolean) 8021 * @see #getDrawingCache() 8022 */ 8023 @ViewDebug.ExportedProperty(category = "drawing") 8024 public boolean isDrawingCacheEnabled() { 8025 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 8026 } 8027 8028 /** 8029 * <p>Returns a display list that can be used to draw this view again 8030 * without executing its draw method.</p> 8031 * 8032 * @return A DisplayList ready to replay, or null if caching is not enabled. 8033 */ 8034 DisplayList getDisplayList() { 8035 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8036 return null; 8037 } 8038 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8039 return null; 8040 } 8041 8042 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED && 8043 ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 8044 mDisplayList == null || !mDisplayList.isValid())) { 8045 8046 if (mDisplayList == null) { 8047 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 8048 } 8049 8050 final HardwareCanvas canvas = mDisplayList.start(); 8051 try { 8052 int width = mRight - mLeft; 8053 int height = mBottom - mTop; 8054 8055 canvas.setViewport(width, height); 8056 canvas.onPreDraw(); 8057 8058 final int restoreCount = canvas.save(); 8059 8060 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8061 8062 // Fast path for layouts with no backgrounds 8063 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8064 mPrivateFlags &= ~DIRTY_MASK; 8065 dispatchDraw(canvas); 8066 } else { 8067 draw(canvas); 8068 } 8069 8070 canvas.restoreToCount(restoreCount); 8071 } finally { 8072 canvas.onPostDraw(); 8073 8074 mDisplayList.end(); 8075 } 8076 } 8077 8078 return mDisplayList; 8079 } 8080 8081 /** 8082 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 8083 * 8084 * @return A non-scaled bitmap representing this view or null if cache is disabled. 8085 * 8086 * @see #getDrawingCache(boolean) 8087 */ 8088 public Bitmap getDrawingCache() { 8089 return getDrawingCache(false); 8090 } 8091 8092 /** 8093 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 8094 * is null when caching is disabled. If caching is enabled and the cache is not ready, 8095 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 8096 * draw from the cache when the cache is enabled. To benefit from the cache, you must 8097 * request the drawing cache by calling this method and draw it on screen if the 8098 * returned bitmap is not null.</p> 8099 * 8100 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8101 * this method will create a bitmap of the same size as this view. Because this bitmap 8102 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8103 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8104 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8105 * size than the view. This implies that your application must be able to handle this 8106 * size.</p> 8107 * 8108 * @param autoScale Indicates whether the generated bitmap should be scaled based on 8109 * the current density of the screen when the application is in compatibility 8110 * mode. 8111 * 8112 * @return A bitmap representing this view or null if cache is disabled. 8113 * 8114 * @see #setDrawingCacheEnabled(boolean) 8115 * @see #isDrawingCacheEnabled() 8116 * @see #buildDrawingCache(boolean) 8117 * @see #destroyDrawingCache() 8118 */ 8119 public Bitmap getDrawingCache(boolean autoScale) { 8120 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8121 return null; 8122 } 8123 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 8124 buildDrawingCache(autoScale); 8125 } 8126 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 8127 } 8128 8129 /** 8130 * <p>Frees the resources used by the drawing cache. If you call 8131 * {@link #buildDrawingCache()} manually without calling 8132 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8133 * should cleanup the cache with this method afterwards.</p> 8134 * 8135 * @see #setDrawingCacheEnabled(boolean) 8136 * @see #buildDrawingCache() 8137 * @see #getDrawingCache() 8138 */ 8139 public void destroyDrawingCache() { 8140 if (mDrawingCache != null) { 8141 mDrawingCache.recycle(); 8142 mDrawingCache = null; 8143 } 8144 if (mUnscaledDrawingCache != null) { 8145 mUnscaledDrawingCache.recycle(); 8146 mUnscaledDrawingCache = null; 8147 } 8148 if (mDisplayList != null) { 8149 mDisplayList.invalidate(); 8150 } 8151 } 8152 8153 /** 8154 * Setting a solid background color for the drawing cache's bitmaps will improve 8155 * perfromance and memory usage. Note, though that this should only be used if this 8156 * view will always be drawn on top of a solid color. 8157 * 8158 * @param color The background color to use for the drawing cache's bitmap 8159 * 8160 * @see #setDrawingCacheEnabled(boolean) 8161 * @see #buildDrawingCache() 8162 * @see #getDrawingCache() 8163 */ 8164 public void setDrawingCacheBackgroundColor(int color) { 8165 if (color != mDrawingCacheBackgroundColor) { 8166 mDrawingCacheBackgroundColor = color; 8167 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8168 } 8169 } 8170 8171 /** 8172 * @see #setDrawingCacheBackgroundColor(int) 8173 * 8174 * @return The background color to used for the drawing cache's bitmap 8175 */ 8176 public int getDrawingCacheBackgroundColor() { 8177 return mDrawingCacheBackgroundColor; 8178 } 8179 8180 /** 8181 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 8182 * 8183 * @see #buildDrawingCache(boolean) 8184 */ 8185 public void buildDrawingCache() { 8186 buildDrawingCache(false); 8187 } 8188 8189 /** 8190 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 8191 * 8192 * <p>If you call {@link #buildDrawingCache()} manually without calling 8193 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8194 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 8195 * 8196 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8197 * this method will create a bitmap of the same size as this view. Because this bitmap 8198 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8199 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8200 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8201 * size than the view. This implies that your application must be able to handle this 8202 * size.</p> 8203 * 8204 * <p>You should avoid calling this method when hardware acceleration is enabled. If 8205 * you do not need the drawing cache bitmap, calling this method will increase memory 8206 * usage and cause the view to be rendered in software once, thus negatively impacting 8207 * performance.</p> 8208 * 8209 * @see #getDrawingCache() 8210 * @see #destroyDrawingCache() 8211 */ 8212 public void buildDrawingCache(boolean autoScale) { 8213 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 8214 mDrawingCache == null : mUnscaledDrawingCache == null)) { 8215 8216 if (ViewDebug.TRACE_HIERARCHY) { 8217 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 8218 } 8219 8220 int width = mRight - mLeft; 8221 int height = mBottom - mTop; 8222 8223 final AttachInfo attachInfo = mAttachInfo; 8224 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 8225 8226 if (autoScale && scalingRequired) { 8227 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 8228 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 8229 } 8230 8231 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 8232 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 8233 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 8234 8235 if (width <= 0 || height <= 0 || 8236 // Projected bitmap size in bytes 8237 (width * height * (opaque && !use32BitCache ? 2 : 4) > 8238 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 8239 destroyDrawingCache(); 8240 return; 8241 } 8242 8243 boolean clear = true; 8244 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 8245 8246 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 8247 Bitmap.Config quality; 8248 if (!opaque) { 8249 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 8250 case DRAWING_CACHE_QUALITY_AUTO: 8251 quality = Bitmap.Config.ARGB_8888; 8252 break; 8253 case DRAWING_CACHE_QUALITY_LOW: 8254 quality = Bitmap.Config.ARGB_4444; 8255 break; 8256 case DRAWING_CACHE_QUALITY_HIGH: 8257 quality = Bitmap.Config.ARGB_8888; 8258 break; 8259 default: 8260 quality = Bitmap.Config.ARGB_8888; 8261 break; 8262 } 8263 } else { 8264 // Optimization for translucent windows 8265 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 8266 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 8267 } 8268 8269 // Try to cleanup memory 8270 if (bitmap != null) bitmap.recycle(); 8271 8272 try { 8273 bitmap = Bitmap.createBitmap(width, height, quality); 8274 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8275 if (autoScale) { 8276 mDrawingCache = bitmap; 8277 } else { 8278 mUnscaledDrawingCache = bitmap; 8279 } 8280 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 8281 } catch (OutOfMemoryError e) { 8282 // If there is not enough memory to create the bitmap cache, just 8283 // ignore the issue as bitmap caches are not required to draw the 8284 // view hierarchy 8285 if (autoScale) { 8286 mDrawingCache = null; 8287 } else { 8288 mUnscaledDrawingCache = null; 8289 } 8290 return; 8291 } 8292 8293 clear = drawingCacheBackgroundColor != 0; 8294 } 8295 8296 Canvas canvas; 8297 if (attachInfo != null) { 8298 canvas = attachInfo.mCanvas; 8299 if (canvas == null) { 8300 canvas = new Canvas(); 8301 } 8302 canvas.setBitmap(bitmap); 8303 // Temporarily clobber the cached Canvas in case one of our children 8304 // is also using a drawing cache. Without this, the children would 8305 // steal the canvas by attaching their own bitmap to it and bad, bad 8306 // thing would happen (invisible views, corrupted drawings, etc.) 8307 attachInfo.mCanvas = null; 8308 } else { 8309 // This case should hopefully never or seldom happen 8310 canvas = new Canvas(bitmap); 8311 } 8312 8313 if (clear) { 8314 bitmap.eraseColor(drawingCacheBackgroundColor); 8315 } 8316 8317 computeScroll(); 8318 final int restoreCount = canvas.save(); 8319 8320 if (autoScale && scalingRequired) { 8321 final float scale = attachInfo.mApplicationScale; 8322 canvas.scale(scale, scale); 8323 } 8324 8325 canvas.translate(-mScrollX, -mScrollY); 8326 8327 mPrivateFlags |= DRAWN; 8328 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 8329 mLayerType != LAYER_TYPE_NONE) { 8330 mPrivateFlags |= DRAWING_CACHE_VALID; 8331 } 8332 8333 // Fast path for layouts with no backgrounds 8334 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8335 if (ViewDebug.TRACE_HIERARCHY) { 8336 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8337 } 8338 mPrivateFlags &= ~DIRTY_MASK; 8339 dispatchDraw(canvas); 8340 } else { 8341 draw(canvas); 8342 } 8343 8344 canvas.restoreToCount(restoreCount); 8345 8346 if (attachInfo != null) { 8347 // Restore the cached Canvas for our siblings 8348 attachInfo.mCanvas = canvas; 8349 } 8350 } 8351 } 8352 8353 /** 8354 * Create a snapshot of the view into a bitmap. We should probably make 8355 * some form of this public, but should think about the API. 8356 */ 8357 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 8358 int width = mRight - mLeft; 8359 int height = mBottom - mTop; 8360 8361 final AttachInfo attachInfo = mAttachInfo; 8362 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 8363 width = (int) ((width * scale) + 0.5f); 8364 height = (int) ((height * scale) + 0.5f); 8365 8366 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 8367 if (bitmap == null) { 8368 throw new OutOfMemoryError(); 8369 } 8370 8371 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8372 8373 Canvas canvas; 8374 if (attachInfo != null) { 8375 canvas = attachInfo.mCanvas; 8376 if (canvas == null) { 8377 canvas = new Canvas(); 8378 } 8379 canvas.setBitmap(bitmap); 8380 // Temporarily clobber the cached Canvas in case one of our children 8381 // is also using a drawing cache. Without this, the children would 8382 // steal the canvas by attaching their own bitmap to it and bad, bad 8383 // things would happen (invisible views, corrupted drawings, etc.) 8384 attachInfo.mCanvas = null; 8385 } else { 8386 // This case should hopefully never or seldom happen 8387 canvas = new Canvas(bitmap); 8388 } 8389 8390 if ((backgroundColor & 0xff000000) != 0) { 8391 bitmap.eraseColor(backgroundColor); 8392 } 8393 8394 computeScroll(); 8395 final int restoreCount = canvas.save(); 8396 canvas.scale(scale, scale); 8397 canvas.translate(-mScrollX, -mScrollY); 8398 8399 // Temporarily remove the dirty mask 8400 int flags = mPrivateFlags; 8401 mPrivateFlags &= ~DIRTY_MASK; 8402 8403 // Fast path for layouts with no backgrounds 8404 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8405 dispatchDraw(canvas); 8406 } else { 8407 draw(canvas); 8408 } 8409 8410 mPrivateFlags = flags; 8411 8412 canvas.restoreToCount(restoreCount); 8413 8414 if (attachInfo != null) { 8415 // Restore the cached Canvas for our siblings 8416 attachInfo.mCanvas = canvas; 8417 } 8418 8419 return bitmap; 8420 } 8421 8422 /** 8423 * Indicates whether this View is currently in edit mode. A View is usually 8424 * in edit mode when displayed within a developer tool. For instance, if 8425 * this View is being drawn by a visual user interface builder, this method 8426 * should return true. 8427 * 8428 * Subclasses should check the return value of this method to provide 8429 * different behaviors if their normal behavior might interfere with the 8430 * host environment. For instance: the class spawns a thread in its 8431 * constructor, the drawing code relies on device-specific features, etc. 8432 * 8433 * This method is usually checked in the drawing code of custom widgets. 8434 * 8435 * @return True if this View is in edit mode, false otherwise. 8436 */ 8437 public boolean isInEditMode() { 8438 return false; 8439 } 8440 8441 /** 8442 * If the View draws content inside its padding and enables fading edges, 8443 * it needs to support padding offsets. Padding offsets are added to the 8444 * fading edges to extend the length of the fade so that it covers pixels 8445 * drawn inside the padding. 8446 * 8447 * Subclasses of this class should override this method if they need 8448 * to draw content inside the padding. 8449 * 8450 * @return True if padding offset must be applied, false otherwise. 8451 * 8452 * @see #getLeftPaddingOffset() 8453 * @see #getRightPaddingOffset() 8454 * @see #getTopPaddingOffset() 8455 * @see #getBottomPaddingOffset() 8456 * 8457 * @since CURRENT 8458 */ 8459 protected boolean isPaddingOffsetRequired() { 8460 return false; 8461 } 8462 8463 /** 8464 * Amount by which to extend the left fading region. Called only when 8465 * {@link #isPaddingOffsetRequired()} returns true. 8466 * 8467 * @return The left padding offset in pixels. 8468 * 8469 * @see #isPaddingOffsetRequired() 8470 * 8471 * @since CURRENT 8472 */ 8473 protected int getLeftPaddingOffset() { 8474 return 0; 8475 } 8476 8477 /** 8478 * Amount by which to extend the right fading region. Called only when 8479 * {@link #isPaddingOffsetRequired()} returns true. 8480 * 8481 * @return The right padding offset in pixels. 8482 * 8483 * @see #isPaddingOffsetRequired() 8484 * 8485 * @since CURRENT 8486 */ 8487 protected int getRightPaddingOffset() { 8488 return 0; 8489 } 8490 8491 /** 8492 * Amount by which to extend the top fading region. Called only when 8493 * {@link #isPaddingOffsetRequired()} returns true. 8494 * 8495 * @return The top padding offset in pixels. 8496 * 8497 * @see #isPaddingOffsetRequired() 8498 * 8499 * @since CURRENT 8500 */ 8501 protected int getTopPaddingOffset() { 8502 return 0; 8503 } 8504 8505 /** 8506 * Amount by which to extend the bottom fading region. Called only when 8507 * {@link #isPaddingOffsetRequired()} returns true. 8508 * 8509 * @return The bottom padding offset in pixels. 8510 * 8511 * @see #isPaddingOffsetRequired() 8512 * 8513 * @since CURRENT 8514 */ 8515 protected int getBottomPaddingOffset() { 8516 return 0; 8517 } 8518 8519 /** 8520 * <p>Indicates whether this view is attached to an hardware accelerated 8521 * window or not.</p> 8522 * 8523 * <p>Even if this method returns true, it does not mean that every call 8524 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 8525 * accelerated {@link android.graphics.Canvas}. For instance, if this view 8526 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 8527 * window is hardware accelerated, 8528 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 8529 * return false, and this method will return true.</p> 8530 * 8531 * @return True if the view is attached to a window and the window is 8532 * hardware accelerated; false in any other case. 8533 */ 8534 public boolean isHardwareAccelerated() { 8535 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 8536 } 8537 8538 /** 8539 * Manually render this view (and all of its children) to the given Canvas. 8540 * The view must have already done a full layout before this function is 8541 * called. When implementing a view, implement {@link #onDraw} instead of 8542 * overriding this method. If you do need to override this method, call 8543 * the superclass version. 8544 * 8545 * @param canvas The Canvas to which the View is rendered. 8546 */ 8547 public void draw(Canvas canvas) { 8548 if (ViewDebug.TRACE_HIERARCHY) { 8549 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8550 } 8551 8552 final int privateFlags = mPrivateFlags; 8553 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 8554 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 8555 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 8556 8557 /* 8558 * Draw traversal performs several drawing steps which must be executed 8559 * in the appropriate order: 8560 * 8561 * 1. Draw the background 8562 * 2. If necessary, save the canvas' layers to prepare for fading 8563 * 3. Draw view's content 8564 * 4. Draw children 8565 * 5. If necessary, draw the fading edges and restore layers 8566 * 6. Draw decorations (scrollbars for instance) 8567 */ 8568 8569 // Step 1, draw the background, if needed 8570 int saveCount; 8571 8572 if (!dirtyOpaque) { 8573 final Drawable background = mBGDrawable; 8574 if (background != null) { 8575 final int scrollX = mScrollX; 8576 final int scrollY = mScrollY; 8577 8578 if (mBackgroundSizeChanged) { 8579 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 8580 mBackgroundSizeChanged = false; 8581 } 8582 8583 if ((scrollX | scrollY) == 0) { 8584 background.draw(canvas); 8585 } else { 8586 canvas.translate(scrollX, scrollY); 8587 background.draw(canvas); 8588 canvas.translate(-scrollX, -scrollY); 8589 } 8590 } 8591 } 8592 8593 // skip step 2 & 5 if possible (common case) 8594 final int viewFlags = mViewFlags; 8595 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 8596 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 8597 if (!verticalEdges && !horizontalEdges) { 8598 // Step 3, draw the content 8599 if (!dirtyOpaque) onDraw(canvas); 8600 8601 // Step 4, draw the children 8602 dispatchDraw(canvas); 8603 8604 // Step 6, draw decorations (scrollbars) 8605 onDrawScrollBars(canvas); 8606 8607 // we're done... 8608 return; 8609 } 8610 8611 /* 8612 * Here we do the full fledged routine... 8613 * (this is an uncommon case where speed matters less, 8614 * this is why we repeat some of the tests that have been 8615 * done above) 8616 */ 8617 8618 boolean drawTop = false; 8619 boolean drawBottom = false; 8620 boolean drawLeft = false; 8621 boolean drawRight = false; 8622 8623 float topFadeStrength = 0.0f; 8624 float bottomFadeStrength = 0.0f; 8625 float leftFadeStrength = 0.0f; 8626 float rightFadeStrength = 0.0f; 8627 8628 // Step 2, save the canvas' layers 8629 int paddingLeft = mPaddingLeft; 8630 int paddingTop = mPaddingTop; 8631 8632 final boolean offsetRequired = isPaddingOffsetRequired(); 8633 if (offsetRequired) { 8634 paddingLeft += getLeftPaddingOffset(); 8635 paddingTop += getTopPaddingOffset(); 8636 } 8637 8638 int left = mScrollX + paddingLeft; 8639 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 8640 int top = mScrollY + paddingTop; 8641 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 8642 8643 if (offsetRequired) { 8644 right += getRightPaddingOffset(); 8645 bottom += getBottomPaddingOffset(); 8646 } 8647 8648 final ScrollabilityCache scrollabilityCache = mScrollCache; 8649 int length = scrollabilityCache.fadingEdgeLength; 8650 8651 // clip the fade length if top and bottom fades overlap 8652 // overlapping fades produce odd-looking artifacts 8653 if (verticalEdges && (top + length > bottom - length)) { 8654 length = (bottom - top) / 2; 8655 } 8656 8657 // also clip horizontal fades if necessary 8658 if (horizontalEdges && (left + length > right - length)) { 8659 length = (right - left) / 2; 8660 } 8661 8662 if (verticalEdges) { 8663 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 8664 drawTop = topFadeStrength > 0.0f; 8665 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 8666 drawBottom = bottomFadeStrength > 0.0f; 8667 } 8668 8669 if (horizontalEdges) { 8670 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 8671 drawLeft = leftFadeStrength > 0.0f; 8672 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 8673 drawRight = rightFadeStrength > 0.0f; 8674 } 8675 8676 saveCount = canvas.getSaveCount(); 8677 8678 int solidColor = getSolidColor(); 8679 if (solidColor == 0) { 8680 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 8681 8682 if (drawTop) { 8683 canvas.saveLayer(left, top, right, top + length, null, flags); 8684 } 8685 8686 if (drawBottom) { 8687 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 8688 } 8689 8690 if (drawLeft) { 8691 canvas.saveLayer(left, top, left + length, bottom, null, flags); 8692 } 8693 8694 if (drawRight) { 8695 canvas.saveLayer(right - length, top, right, bottom, null, flags); 8696 } 8697 } else { 8698 scrollabilityCache.setFadeColor(solidColor); 8699 } 8700 8701 // Step 3, draw the content 8702 if (!dirtyOpaque) onDraw(canvas); 8703 8704 // Step 4, draw the children 8705 dispatchDraw(canvas); 8706 8707 // Step 5, draw the fade effect and restore layers 8708 final Paint p = scrollabilityCache.paint; 8709 final Matrix matrix = scrollabilityCache.matrix; 8710 final Shader fade = scrollabilityCache.shader; 8711 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 8712 8713 if (drawTop) { 8714 matrix.setScale(1, fadeHeight * topFadeStrength); 8715 matrix.postTranslate(left, top); 8716 fade.setLocalMatrix(matrix); 8717 canvas.drawRect(left, top, right, top + length, p); 8718 } 8719 8720 if (drawBottom) { 8721 matrix.setScale(1, fadeHeight * bottomFadeStrength); 8722 matrix.postRotate(180); 8723 matrix.postTranslate(left, bottom); 8724 fade.setLocalMatrix(matrix); 8725 canvas.drawRect(left, bottom - length, right, bottom, p); 8726 } 8727 8728 if (drawLeft) { 8729 matrix.setScale(1, fadeHeight * leftFadeStrength); 8730 matrix.postRotate(-90); 8731 matrix.postTranslate(left, top); 8732 fade.setLocalMatrix(matrix); 8733 canvas.drawRect(left, top, left + length, bottom, p); 8734 } 8735 8736 if (drawRight) { 8737 matrix.setScale(1, fadeHeight * rightFadeStrength); 8738 matrix.postRotate(90); 8739 matrix.postTranslate(right, top); 8740 fade.setLocalMatrix(matrix); 8741 canvas.drawRect(right - length, top, right, bottom, p); 8742 } 8743 8744 canvas.restoreToCount(saveCount); 8745 8746 // Step 6, draw decorations (scrollbars) 8747 onDrawScrollBars(canvas); 8748 } 8749 8750 /** 8751 * Override this if your view is known to always be drawn on top of a solid color background, 8752 * and needs to draw fading edges. Returning a non-zero color enables the view system to 8753 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 8754 * should be set to 0xFF. 8755 * 8756 * @see #setVerticalFadingEdgeEnabled 8757 * @see #setHorizontalFadingEdgeEnabled 8758 * 8759 * @return The known solid color background for this view, or 0 if the color may vary 8760 */ 8761 public int getSolidColor() { 8762 return 0; 8763 } 8764 8765 /** 8766 * Build a human readable string representation of the specified view flags. 8767 * 8768 * @param flags the view flags to convert to a string 8769 * @return a String representing the supplied flags 8770 */ 8771 private static String printFlags(int flags) { 8772 String output = ""; 8773 int numFlags = 0; 8774 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 8775 output += "TAKES_FOCUS"; 8776 numFlags++; 8777 } 8778 8779 switch (flags & VISIBILITY_MASK) { 8780 case INVISIBLE: 8781 if (numFlags > 0) { 8782 output += " "; 8783 } 8784 output += "INVISIBLE"; 8785 // USELESS HERE numFlags++; 8786 break; 8787 case GONE: 8788 if (numFlags > 0) { 8789 output += " "; 8790 } 8791 output += "GONE"; 8792 // USELESS HERE numFlags++; 8793 break; 8794 default: 8795 break; 8796 } 8797 return output; 8798 } 8799 8800 /** 8801 * Build a human readable string representation of the specified private 8802 * view flags. 8803 * 8804 * @param privateFlags the private view flags to convert to a string 8805 * @return a String representing the supplied flags 8806 */ 8807 private static String printPrivateFlags(int privateFlags) { 8808 String output = ""; 8809 int numFlags = 0; 8810 8811 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 8812 output += "WANTS_FOCUS"; 8813 numFlags++; 8814 } 8815 8816 if ((privateFlags & FOCUSED) == FOCUSED) { 8817 if (numFlags > 0) { 8818 output += " "; 8819 } 8820 output += "FOCUSED"; 8821 numFlags++; 8822 } 8823 8824 if ((privateFlags & SELECTED) == SELECTED) { 8825 if (numFlags > 0) { 8826 output += " "; 8827 } 8828 output += "SELECTED"; 8829 numFlags++; 8830 } 8831 8832 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 8833 if (numFlags > 0) { 8834 output += " "; 8835 } 8836 output += "IS_ROOT_NAMESPACE"; 8837 numFlags++; 8838 } 8839 8840 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 8841 if (numFlags > 0) { 8842 output += " "; 8843 } 8844 output += "HAS_BOUNDS"; 8845 numFlags++; 8846 } 8847 8848 if ((privateFlags & DRAWN) == DRAWN) { 8849 if (numFlags > 0) { 8850 output += " "; 8851 } 8852 output += "DRAWN"; 8853 // USELESS HERE numFlags++; 8854 } 8855 return output; 8856 } 8857 8858 /** 8859 * <p>Indicates whether or not this view's layout will be requested during 8860 * the next hierarchy layout pass.</p> 8861 * 8862 * @return true if the layout will be forced during next layout pass 8863 */ 8864 public boolean isLayoutRequested() { 8865 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 8866 } 8867 8868 /** 8869 * Assign a size and position to a view and all of its 8870 * descendants 8871 * 8872 * <p>This is the second phase of the layout mechanism. 8873 * (The first is measuring). In this phase, each parent calls 8874 * layout on all of its children to position them. 8875 * This is typically done using the child measurements 8876 * that were stored in the measure pass(). 8877 * 8878 * Derived classes with children should override 8879 * onLayout. In that method, they should 8880 * call layout on each of their children. 8881 * 8882 * @param l Left position, relative to parent 8883 * @param t Top position, relative to parent 8884 * @param r Right position, relative to parent 8885 * @param b Bottom position, relative to parent 8886 */ 8887 @SuppressWarnings({"unchecked"}) 8888 public final void layout(int l, int t, int r, int b) { 8889 int oldL = mLeft; 8890 int oldT = mTop; 8891 int oldB = mBottom; 8892 int oldR = mRight; 8893 boolean changed = setFrame(l, t, r, b); 8894 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 8895 if (ViewDebug.TRACE_HIERARCHY) { 8896 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 8897 } 8898 8899 onLayout(changed, l, t, r, b); 8900 mPrivateFlags &= ~LAYOUT_REQUIRED; 8901 8902 if (mOnLayoutChangeListeners != null) { 8903 ArrayList<OnLayoutChangeListener> listenersCopy = 8904 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 8905 int numListeners = listenersCopy.size(); 8906 for (int i = 0; i < numListeners; ++i) { 8907 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 8908 } 8909 } 8910 } 8911 mPrivateFlags &= ~FORCE_LAYOUT; 8912 } 8913 8914 /** 8915 * Called from layout when this view should 8916 * assign a size and position to each of its children. 8917 * 8918 * Derived classes with children should override 8919 * this method and call layout on each of 8920 * their children. 8921 * @param changed This is a new size or position for this view 8922 * @param left Left position, relative to parent 8923 * @param top Top position, relative to parent 8924 * @param right Right position, relative to parent 8925 * @param bottom Bottom position, relative to parent 8926 */ 8927 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 8928 } 8929 8930 /** 8931 * Assign a size and position to this view. 8932 * 8933 * This is called from layout. 8934 * 8935 * @param left Left position, relative to parent 8936 * @param top Top position, relative to parent 8937 * @param right Right position, relative to parent 8938 * @param bottom Bottom position, relative to parent 8939 * @return true if the new size and position are different than the 8940 * previous ones 8941 * {@hide} 8942 */ 8943 protected boolean setFrame(int left, int top, int right, int bottom) { 8944 boolean changed = false; 8945 8946 if (DBG) { 8947 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 8948 + right + "," + bottom + ")"); 8949 } 8950 8951 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 8952 changed = true; 8953 8954 // Remember our drawn bit 8955 int drawn = mPrivateFlags & DRAWN; 8956 8957 // Invalidate our old position 8958 invalidate(); 8959 8960 8961 int oldWidth = mRight - mLeft; 8962 int oldHeight = mBottom - mTop; 8963 8964 mLeft = left; 8965 mTop = top; 8966 mRight = right; 8967 mBottom = bottom; 8968 8969 mPrivateFlags |= HAS_BOUNDS; 8970 8971 int newWidth = right - left; 8972 int newHeight = bottom - top; 8973 8974 if (newWidth != oldWidth || newHeight != oldHeight) { 8975 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8976 // A change in dimension means an auto-centered pivot point changes, too 8977 mMatrixDirty = true; 8978 } 8979 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 8980 } 8981 8982 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 8983 // If we are visible, force the DRAWN bit to on so that 8984 // this invalidate will go through (at least to our parent). 8985 // This is because someone may have invalidated this view 8986 // before this call to setFrame came in, thereby clearing 8987 // the DRAWN bit. 8988 mPrivateFlags |= DRAWN; 8989 invalidate(); 8990 } 8991 8992 // Reset drawn bit to original value (invalidate turns it off) 8993 mPrivateFlags |= drawn; 8994 8995 mBackgroundSizeChanged = true; 8996 } 8997 return changed; 8998 } 8999 9000 /** 9001 * Finalize inflating a view from XML. This is called as the last phase 9002 * of inflation, after all child views have been added. 9003 * 9004 * <p>Even if the subclass overrides onFinishInflate, they should always be 9005 * sure to call the super method, so that we get called. 9006 */ 9007 protected void onFinishInflate() { 9008 } 9009 9010 /** 9011 * Returns the resources associated with this view. 9012 * 9013 * @return Resources object. 9014 */ 9015 public Resources getResources() { 9016 return mResources; 9017 } 9018 9019 /** 9020 * Invalidates the specified Drawable. 9021 * 9022 * @param drawable the drawable to invalidate 9023 */ 9024 public void invalidateDrawable(Drawable drawable) { 9025 if (verifyDrawable(drawable)) { 9026 final Rect dirty = drawable.getBounds(); 9027 final int scrollX = mScrollX; 9028 final int scrollY = mScrollY; 9029 9030 invalidate(dirty.left + scrollX, dirty.top + scrollY, 9031 dirty.right + scrollX, dirty.bottom + scrollY); 9032 } 9033 } 9034 9035 /** 9036 * Schedules an action on a drawable to occur at a specified time. 9037 * 9038 * @param who the recipient of the action 9039 * @param what the action to run on the drawable 9040 * @param when the time at which the action must occur. Uses the 9041 * {@link SystemClock#uptimeMillis} timebase. 9042 */ 9043 public void scheduleDrawable(Drawable who, Runnable what, long when) { 9044 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9045 mAttachInfo.mHandler.postAtTime(what, who, when); 9046 } 9047 } 9048 9049 /** 9050 * Cancels a scheduled action on a drawable. 9051 * 9052 * @param who the recipient of the action 9053 * @param what the action to cancel 9054 */ 9055 public void unscheduleDrawable(Drawable who, Runnable what) { 9056 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9057 mAttachInfo.mHandler.removeCallbacks(what, who); 9058 } 9059 } 9060 9061 /** 9062 * Unschedule any events associated with the given Drawable. This can be 9063 * used when selecting a new Drawable into a view, so that the previous 9064 * one is completely unscheduled. 9065 * 9066 * @param who The Drawable to unschedule. 9067 * 9068 * @see #drawableStateChanged 9069 */ 9070 public void unscheduleDrawable(Drawable who) { 9071 if (mAttachInfo != null) { 9072 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 9073 } 9074 } 9075 9076 /** 9077 * If your view subclass is displaying its own Drawable objects, it should 9078 * override this function and return true for any Drawable it is 9079 * displaying. This allows animations for those drawables to be 9080 * scheduled. 9081 * 9082 * <p>Be sure to call through to the super class when overriding this 9083 * function. 9084 * 9085 * @param who The Drawable to verify. Return true if it is one you are 9086 * displaying, else return the result of calling through to the 9087 * super class. 9088 * 9089 * @return boolean If true than the Drawable is being displayed in the 9090 * view; else false and it is not allowed to animate. 9091 * 9092 * @see #unscheduleDrawable 9093 * @see #drawableStateChanged 9094 */ 9095 protected boolean verifyDrawable(Drawable who) { 9096 return who == mBGDrawable; 9097 } 9098 9099 /** 9100 * This function is called whenever the state of the view changes in such 9101 * a way that it impacts the state of drawables being shown. 9102 * 9103 * <p>Be sure to call through to the superclass when overriding this 9104 * function. 9105 * 9106 * @see Drawable#setState 9107 */ 9108 protected void drawableStateChanged() { 9109 Drawable d = mBGDrawable; 9110 if (d != null && d.isStateful()) { 9111 d.setState(getDrawableState()); 9112 } 9113 } 9114 9115 /** 9116 * Call this to force a view to update its drawable state. This will cause 9117 * drawableStateChanged to be called on this view. Views that are interested 9118 * in the new state should call getDrawableState. 9119 * 9120 * @see #drawableStateChanged 9121 * @see #getDrawableState 9122 */ 9123 public void refreshDrawableState() { 9124 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9125 drawableStateChanged(); 9126 9127 ViewParent parent = mParent; 9128 if (parent != null) { 9129 parent.childDrawableStateChanged(this); 9130 } 9131 } 9132 9133 /** 9134 * Return an array of resource IDs of the drawable states representing the 9135 * current state of the view. 9136 * 9137 * @return The current drawable state 9138 * 9139 * @see Drawable#setState 9140 * @see #drawableStateChanged 9141 * @see #onCreateDrawableState 9142 */ 9143 public final int[] getDrawableState() { 9144 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 9145 return mDrawableState; 9146 } else { 9147 mDrawableState = onCreateDrawableState(0); 9148 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 9149 return mDrawableState; 9150 } 9151 } 9152 9153 /** 9154 * Generate the new {@link android.graphics.drawable.Drawable} state for 9155 * this view. This is called by the view 9156 * system when the cached Drawable state is determined to be invalid. To 9157 * retrieve the current state, you should use {@link #getDrawableState}. 9158 * 9159 * @param extraSpace if non-zero, this is the number of extra entries you 9160 * would like in the returned array in which you can place your own 9161 * states. 9162 * 9163 * @return Returns an array holding the current {@link Drawable} state of 9164 * the view. 9165 * 9166 * @see #mergeDrawableStates 9167 */ 9168 protected int[] onCreateDrawableState(int extraSpace) { 9169 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 9170 mParent instanceof View) { 9171 return ((View) mParent).onCreateDrawableState(extraSpace); 9172 } 9173 9174 int[] drawableState; 9175 9176 int privateFlags = mPrivateFlags; 9177 9178 int viewStateIndex = 0; 9179 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 9180 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 9181 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 9182 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 9183 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 9184 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 9185 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested) { 9186 // This is set if HW acceleration is requested, even if the current 9187 // process doesn't allow it. This is just to allow app preview 9188 // windows to better match their app. 9189 viewStateIndex |= VIEW_STATE_ACCELERATED; 9190 } 9191 9192 drawableState = VIEW_STATE_SETS[viewStateIndex]; 9193 9194 //noinspection ConstantIfStatement 9195 if (false) { 9196 Log.i("View", "drawableStateIndex=" + viewStateIndex); 9197 Log.i("View", toString() 9198 + " pressed=" + ((privateFlags & PRESSED) != 0) 9199 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 9200 + " fo=" + hasFocus() 9201 + " sl=" + ((privateFlags & SELECTED) != 0) 9202 + " wf=" + hasWindowFocus() 9203 + ": " + Arrays.toString(drawableState)); 9204 } 9205 9206 if (extraSpace == 0) { 9207 return drawableState; 9208 } 9209 9210 final int[] fullState; 9211 if (drawableState != null) { 9212 fullState = new int[drawableState.length + extraSpace]; 9213 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 9214 } else { 9215 fullState = new int[extraSpace]; 9216 } 9217 9218 return fullState; 9219 } 9220 9221 /** 9222 * Merge your own state values in <var>additionalState</var> into the base 9223 * state values <var>baseState</var> that were returned by 9224 * {@link #onCreateDrawableState}. 9225 * 9226 * @param baseState The base state values returned by 9227 * {@link #onCreateDrawableState}, which will be modified to also hold your 9228 * own additional state values. 9229 * 9230 * @param additionalState The additional state values you would like 9231 * added to <var>baseState</var>; this array is not modified. 9232 * 9233 * @return As a convenience, the <var>baseState</var> array you originally 9234 * passed into the function is returned. 9235 * 9236 * @see #onCreateDrawableState 9237 */ 9238 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 9239 final int N = baseState.length; 9240 int i = N - 1; 9241 while (i >= 0 && baseState[i] == 0) { 9242 i--; 9243 } 9244 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 9245 return baseState; 9246 } 9247 9248 /** 9249 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 9250 * on all Drawable objects associated with this view. 9251 */ 9252 public void jumpDrawablesToCurrentState() { 9253 if (mBGDrawable != null) { 9254 mBGDrawable.jumpToCurrentState(); 9255 } 9256 } 9257 9258 /** 9259 * Sets the background color for this view. 9260 * @param color the color of the background 9261 */ 9262 @RemotableViewMethod 9263 public void setBackgroundColor(int color) { 9264 if (mBGDrawable instanceof ColorDrawable) { 9265 ((ColorDrawable) mBGDrawable).setColor(color); 9266 } else { 9267 setBackgroundDrawable(new ColorDrawable(color)); 9268 } 9269 } 9270 9271 /** 9272 * Set the background to a given resource. The resource should refer to 9273 * a Drawable object or 0 to remove the background. 9274 * @param resid The identifier of the resource. 9275 * @attr ref android.R.styleable#View_background 9276 */ 9277 @RemotableViewMethod 9278 public void setBackgroundResource(int resid) { 9279 if (resid != 0 && resid == mBackgroundResource) { 9280 return; 9281 } 9282 9283 Drawable d= null; 9284 if (resid != 0) { 9285 d = mResources.getDrawable(resid); 9286 } 9287 setBackgroundDrawable(d); 9288 9289 mBackgroundResource = resid; 9290 } 9291 9292 /** 9293 * Set the background to a given Drawable, or remove the background. If the 9294 * background has padding, this View's padding is set to the background's 9295 * padding. However, when a background is removed, this View's padding isn't 9296 * touched. If setting the padding is desired, please use 9297 * {@link #setPadding(int, int, int, int)}. 9298 * 9299 * @param d The Drawable to use as the background, or null to remove the 9300 * background 9301 */ 9302 public void setBackgroundDrawable(Drawable d) { 9303 boolean requestLayout = false; 9304 9305 mBackgroundResource = 0; 9306 9307 /* 9308 * Regardless of whether we're setting a new background or not, we want 9309 * to clear the previous drawable. 9310 */ 9311 if (mBGDrawable != null) { 9312 mBGDrawable.setCallback(null); 9313 unscheduleDrawable(mBGDrawable); 9314 } 9315 9316 if (d != null) { 9317 Rect padding = sThreadLocal.get(); 9318 if (padding == null) { 9319 padding = new Rect(); 9320 sThreadLocal.set(padding); 9321 } 9322 if (d.getPadding(padding)) { 9323 setPadding(padding.left, padding.top, padding.right, padding.bottom); 9324 } 9325 9326 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 9327 // if it has a different minimum size, we should layout again 9328 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 9329 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 9330 requestLayout = true; 9331 } 9332 9333 d.setCallback(this); 9334 if (d.isStateful()) { 9335 d.setState(getDrawableState()); 9336 } 9337 d.setVisible(getVisibility() == VISIBLE, false); 9338 mBGDrawable = d; 9339 9340 if ((mPrivateFlags & SKIP_DRAW) != 0) { 9341 mPrivateFlags &= ~SKIP_DRAW; 9342 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 9343 requestLayout = true; 9344 } 9345 } else { 9346 /* Remove the background */ 9347 mBGDrawable = null; 9348 9349 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 9350 /* 9351 * This view ONLY drew the background before and we're removing 9352 * the background, so now it won't draw anything 9353 * (hence we SKIP_DRAW) 9354 */ 9355 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 9356 mPrivateFlags |= SKIP_DRAW; 9357 } 9358 9359 /* 9360 * When the background is set, we try to apply its padding to this 9361 * View. When the background is removed, we don't touch this View's 9362 * padding. This is noted in the Javadocs. Hence, we don't need to 9363 * requestLayout(), the invalidate() below is sufficient. 9364 */ 9365 9366 // The old background's minimum size could have affected this 9367 // View's layout, so let's requestLayout 9368 requestLayout = true; 9369 } 9370 9371 computeOpaqueFlags(); 9372 9373 if (requestLayout) { 9374 requestLayout(); 9375 } 9376 9377 mBackgroundSizeChanged = true; 9378 invalidate(); 9379 } 9380 9381 /** 9382 * Gets the background drawable 9383 * @return The drawable used as the background for this view, if any. 9384 */ 9385 public Drawable getBackground() { 9386 return mBGDrawable; 9387 } 9388 9389 /** 9390 * Sets the padding. The view may add on the space required to display 9391 * the scrollbars, depending on the style and visibility of the scrollbars. 9392 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 9393 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 9394 * from the values set in this call. 9395 * 9396 * @attr ref android.R.styleable#View_padding 9397 * @attr ref android.R.styleable#View_paddingBottom 9398 * @attr ref android.R.styleable#View_paddingLeft 9399 * @attr ref android.R.styleable#View_paddingRight 9400 * @attr ref android.R.styleable#View_paddingTop 9401 * @param left the left padding in pixels 9402 * @param top the top padding in pixels 9403 * @param right the right padding in pixels 9404 * @param bottom the bottom padding in pixels 9405 */ 9406 public void setPadding(int left, int top, int right, int bottom) { 9407 boolean changed = false; 9408 9409 mUserPaddingLeft = left; 9410 mUserPaddingRight = right; 9411 mUserPaddingBottom = bottom; 9412 9413 final int viewFlags = mViewFlags; 9414 9415 // Common case is there are no scroll bars. 9416 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 9417 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 9418 // TODO Determine what to do with SCROLLBAR_POSITION_DEFAULT based on RTL settings. 9419 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 9420 ? 0 : getVerticalScrollbarWidth(); 9421 switch (mVerticalScrollbarPosition) { 9422 case SCROLLBAR_POSITION_DEFAULT: 9423 case SCROLLBAR_POSITION_RIGHT: 9424 right += offset; 9425 break; 9426 case SCROLLBAR_POSITION_LEFT: 9427 left += offset; 9428 break; 9429 } 9430 } 9431 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 9432 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 9433 ? 0 : getHorizontalScrollbarHeight(); 9434 } 9435 } 9436 9437 if (mPaddingLeft != left) { 9438 changed = true; 9439 mPaddingLeft = left; 9440 } 9441 if (mPaddingTop != top) { 9442 changed = true; 9443 mPaddingTop = top; 9444 } 9445 if (mPaddingRight != right) { 9446 changed = true; 9447 mPaddingRight = right; 9448 } 9449 if (mPaddingBottom != bottom) { 9450 changed = true; 9451 mPaddingBottom = bottom; 9452 } 9453 9454 if (changed) { 9455 requestLayout(); 9456 } 9457 } 9458 9459 /** 9460 * Returns the top padding of this view. 9461 * 9462 * @return the top padding in pixels 9463 */ 9464 public int getPaddingTop() { 9465 return mPaddingTop; 9466 } 9467 9468 /** 9469 * Returns the bottom padding of this view. If there are inset and enabled 9470 * scrollbars, this value may include the space required to display the 9471 * scrollbars as well. 9472 * 9473 * @return the bottom padding in pixels 9474 */ 9475 public int getPaddingBottom() { 9476 return mPaddingBottom; 9477 } 9478 9479 /** 9480 * Returns the left padding of this view. If there are inset and enabled 9481 * scrollbars, this value may include the space required to display the 9482 * scrollbars as well. 9483 * 9484 * @return the left padding in pixels 9485 */ 9486 public int getPaddingLeft() { 9487 return mPaddingLeft; 9488 } 9489 9490 /** 9491 * Returns the right padding of this view. If there are inset and enabled 9492 * scrollbars, this value may include the space required to display the 9493 * scrollbars as well. 9494 * 9495 * @return the right padding in pixels 9496 */ 9497 public int getPaddingRight() { 9498 return mPaddingRight; 9499 } 9500 9501 /** 9502 * Changes the selection state of this view. A view can be selected or not. 9503 * Note that selection is not the same as focus. Views are typically 9504 * selected in the context of an AdapterView like ListView or GridView; 9505 * the selected view is the view that is highlighted. 9506 * 9507 * @param selected true if the view must be selected, false otherwise 9508 */ 9509 public void setSelected(boolean selected) { 9510 if (((mPrivateFlags & SELECTED) != 0) != selected) { 9511 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 9512 if (!selected) resetPressedState(); 9513 invalidate(); 9514 refreshDrawableState(); 9515 dispatchSetSelected(selected); 9516 } 9517 } 9518 9519 /** 9520 * Dispatch setSelected to all of this View's children. 9521 * 9522 * @see #setSelected(boolean) 9523 * 9524 * @param selected The new selected state 9525 */ 9526 protected void dispatchSetSelected(boolean selected) { 9527 } 9528 9529 /** 9530 * Indicates the selection state of this view. 9531 * 9532 * @return true if the view is selected, false otherwise 9533 */ 9534 @ViewDebug.ExportedProperty 9535 public boolean isSelected() { 9536 return (mPrivateFlags & SELECTED) != 0; 9537 } 9538 9539 /** 9540 * Changes the activated state of this view. A view can be activated or not. 9541 * Note that activation is not the same as selection. Selection is 9542 * a transient property, representing the view (hierarchy) the user is 9543 * currently interacting with. Activation is a longer-term state that the 9544 * user can move views in and out of. For example, in a list view with 9545 * single or multiple selection enabled, the views in the current selection 9546 * set are activated. (Um, yeah, we are deeply sorry about the terminology 9547 * here.) The activated state is propagated down to children of the view it 9548 * is set on. 9549 * 9550 * @param activated true if the view must be activated, false otherwise 9551 */ 9552 public void setActivated(boolean activated) { 9553 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 9554 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 9555 invalidate(); 9556 refreshDrawableState(); 9557 dispatchSetActivated(activated); 9558 } 9559 } 9560 9561 /** 9562 * Dispatch setActivated to all of this View's children. 9563 * 9564 * @see #setActivated(boolean) 9565 * 9566 * @param activated The new activated state 9567 */ 9568 protected void dispatchSetActivated(boolean activated) { 9569 } 9570 9571 /** 9572 * Indicates the activation state of this view. 9573 * 9574 * @return true if the view is activated, false otherwise 9575 */ 9576 @ViewDebug.ExportedProperty 9577 public boolean isActivated() { 9578 return (mPrivateFlags & ACTIVATED) != 0; 9579 } 9580 9581 /** 9582 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 9583 * observer can be used to get notifications when global events, like 9584 * layout, happen. 9585 * 9586 * The returned ViewTreeObserver observer is not guaranteed to remain 9587 * valid for the lifetime of this View. If the caller of this method keeps 9588 * a long-lived reference to ViewTreeObserver, it should always check for 9589 * the return value of {@link ViewTreeObserver#isAlive()}. 9590 * 9591 * @return The ViewTreeObserver for this view's hierarchy. 9592 */ 9593 public ViewTreeObserver getViewTreeObserver() { 9594 if (mAttachInfo != null) { 9595 return mAttachInfo.mTreeObserver; 9596 } 9597 if (mFloatingTreeObserver == null) { 9598 mFloatingTreeObserver = new ViewTreeObserver(); 9599 } 9600 return mFloatingTreeObserver; 9601 } 9602 9603 /** 9604 * <p>Finds the topmost view in the current view hierarchy.</p> 9605 * 9606 * @return the topmost view containing this view 9607 */ 9608 public View getRootView() { 9609 if (mAttachInfo != null) { 9610 final View v = mAttachInfo.mRootView; 9611 if (v != null) { 9612 return v; 9613 } 9614 } 9615 9616 View parent = this; 9617 9618 while (parent.mParent != null && parent.mParent instanceof View) { 9619 parent = (View) parent.mParent; 9620 } 9621 9622 return parent; 9623 } 9624 9625 /** 9626 * <p>Computes the coordinates of this view on the screen. The argument 9627 * must be an array of two integers. After the method returns, the array 9628 * contains the x and y location in that order.</p> 9629 * 9630 * @param location an array of two integers in which to hold the coordinates 9631 */ 9632 public void getLocationOnScreen(int[] location) { 9633 getLocationInWindow(location); 9634 9635 final AttachInfo info = mAttachInfo; 9636 if (info != null) { 9637 location[0] += info.mWindowLeft; 9638 location[1] += info.mWindowTop; 9639 } 9640 } 9641 9642 /** 9643 * <p>Computes the coordinates of this view in its window. The argument 9644 * must be an array of two integers. After the method returns, the array 9645 * contains the x and y location in that order.</p> 9646 * 9647 * @param location an array of two integers in which to hold the coordinates 9648 */ 9649 public void getLocationInWindow(int[] location) { 9650 if (location == null || location.length < 2) { 9651 throw new IllegalArgumentException("location must be an array of " 9652 + "two integers"); 9653 } 9654 9655 location[0] = mLeft + (int) (mTranslationX + 0.5f); 9656 location[1] = mTop + (int) (mTranslationY + 0.5f); 9657 9658 ViewParent viewParent = mParent; 9659 while (viewParent instanceof View) { 9660 final View view = (View)viewParent; 9661 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 9662 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 9663 viewParent = view.mParent; 9664 } 9665 9666 if (viewParent instanceof ViewRoot) { 9667 // *cough* 9668 final ViewRoot vr = (ViewRoot)viewParent; 9669 location[1] -= vr.mCurScrollY; 9670 } 9671 } 9672 9673 /** 9674 * {@hide} 9675 * @param id the id of the view to be found 9676 * @return the view of the specified id, null if cannot be found 9677 */ 9678 protected View findViewTraversal(int id) { 9679 if (id == mID) { 9680 return this; 9681 } 9682 return null; 9683 } 9684 9685 /** 9686 * {@hide} 9687 * @param tag the tag of the view to be found 9688 * @return the view of specified tag, null if cannot be found 9689 */ 9690 protected View findViewWithTagTraversal(Object tag) { 9691 if (tag != null && tag.equals(mTag)) { 9692 return this; 9693 } 9694 return null; 9695 } 9696 9697 /** 9698 * {@hide} 9699 * @param predicate The predicate to evaluate. 9700 * @return The first view that matches the predicate or null. 9701 */ 9702 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 9703 if (predicate.apply(this)) { 9704 return this; 9705 } 9706 return null; 9707 } 9708 9709 /** 9710 * Look for a child view with the given id. If this view has the given 9711 * id, return this view. 9712 * 9713 * @param id The id to search for. 9714 * @return The view that has the given id in the hierarchy or null 9715 */ 9716 public final View findViewById(int id) { 9717 if (id < 0) { 9718 return null; 9719 } 9720 return findViewTraversal(id); 9721 } 9722 9723 /** 9724 * Look for a child view with the given tag. If this view has the given 9725 * tag, return this view. 9726 * 9727 * @param tag The tag to search for, using "tag.equals(getTag())". 9728 * @return The View that has the given tag in the hierarchy or null 9729 */ 9730 public final View findViewWithTag(Object tag) { 9731 if (tag == null) { 9732 return null; 9733 } 9734 return findViewWithTagTraversal(tag); 9735 } 9736 9737 /** 9738 * {@hide} 9739 * Look for a child view that matches the specified predicate. 9740 * If this view matches the predicate, return this view. 9741 * 9742 * @param predicate The predicate to evaluate. 9743 * @return The first view that matches the predicate or null. 9744 */ 9745 public final View findViewByPredicate(Predicate<View> predicate) { 9746 return findViewByPredicateTraversal(predicate); 9747 } 9748 9749 /** 9750 * Sets the identifier for this view. The identifier does not have to be 9751 * unique in this view's hierarchy. The identifier should be a positive 9752 * number. 9753 * 9754 * @see #NO_ID 9755 * @see #getId 9756 * @see #findViewById 9757 * 9758 * @param id a number used to identify the view 9759 * 9760 * @attr ref android.R.styleable#View_id 9761 */ 9762 public void setId(int id) { 9763 mID = id; 9764 } 9765 9766 /** 9767 * {@hide} 9768 * 9769 * @param isRoot true if the view belongs to the root namespace, false 9770 * otherwise 9771 */ 9772 public void setIsRootNamespace(boolean isRoot) { 9773 if (isRoot) { 9774 mPrivateFlags |= IS_ROOT_NAMESPACE; 9775 } else { 9776 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 9777 } 9778 } 9779 9780 /** 9781 * {@hide} 9782 * 9783 * @return true if the view belongs to the root namespace, false otherwise 9784 */ 9785 public boolean isRootNamespace() { 9786 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 9787 } 9788 9789 /** 9790 * Returns this view's identifier. 9791 * 9792 * @return a positive integer used to identify the view or {@link #NO_ID} 9793 * if the view has no ID 9794 * 9795 * @see #setId 9796 * @see #findViewById 9797 * @attr ref android.R.styleable#View_id 9798 */ 9799 @ViewDebug.CapturedViewProperty 9800 public int getId() { 9801 return mID; 9802 } 9803 9804 /** 9805 * Returns this view's tag. 9806 * 9807 * @return the Object stored in this view as a tag 9808 * 9809 * @see #setTag(Object) 9810 * @see #getTag(int) 9811 */ 9812 @ViewDebug.ExportedProperty 9813 public Object getTag() { 9814 return mTag; 9815 } 9816 9817 /** 9818 * Sets the tag associated with this view. A tag can be used to mark 9819 * a view in its hierarchy and does not have to be unique within the 9820 * hierarchy. Tags can also be used to store data within a view without 9821 * resorting to another data structure. 9822 * 9823 * @param tag an Object to tag the view with 9824 * 9825 * @see #getTag() 9826 * @see #setTag(int, Object) 9827 */ 9828 public void setTag(final Object tag) { 9829 mTag = tag; 9830 } 9831 9832 /** 9833 * Returns the tag associated with this view and the specified key. 9834 * 9835 * @param key The key identifying the tag 9836 * 9837 * @return the Object stored in this view as a tag 9838 * 9839 * @see #setTag(int, Object) 9840 * @see #getTag() 9841 */ 9842 public Object getTag(int key) { 9843 SparseArray<Object> tags = null; 9844 synchronized (sTagsLock) { 9845 if (sTags != null) { 9846 tags = sTags.get(this); 9847 } 9848 } 9849 9850 if (tags != null) return tags.get(key); 9851 return null; 9852 } 9853 9854 /** 9855 * Sets a tag associated with this view and a key. A tag can be used 9856 * to mark a view in its hierarchy and does not have to be unique within 9857 * the hierarchy. Tags can also be used to store data within a view 9858 * without resorting to another data structure. 9859 * 9860 * The specified key should be an id declared in the resources of the 9861 * application to ensure it is unique (see the <a 9862 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 9863 * Keys identified as belonging to 9864 * the Android framework or not associated with any package will cause 9865 * an {@link IllegalArgumentException} to be thrown. 9866 * 9867 * @param key The key identifying the tag 9868 * @param tag An Object to tag the view with 9869 * 9870 * @throws IllegalArgumentException If they specified key is not valid 9871 * 9872 * @see #setTag(Object) 9873 * @see #getTag(int) 9874 */ 9875 public void setTag(int key, final Object tag) { 9876 // If the package id is 0x00 or 0x01, it's either an undefined package 9877 // or a framework id 9878 if ((key >>> 24) < 2) { 9879 throw new IllegalArgumentException("The key must be an application-specific " 9880 + "resource id."); 9881 } 9882 9883 setTagInternal(this, key, tag); 9884 } 9885 9886 /** 9887 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 9888 * framework id. 9889 * 9890 * @hide 9891 */ 9892 public void setTagInternal(int key, Object tag) { 9893 if ((key >>> 24) != 0x1) { 9894 throw new IllegalArgumentException("The key must be a framework-specific " 9895 + "resource id."); 9896 } 9897 9898 setTagInternal(this, key, tag); 9899 } 9900 9901 private static void setTagInternal(View view, int key, Object tag) { 9902 SparseArray<Object> tags = null; 9903 synchronized (sTagsLock) { 9904 if (sTags == null) { 9905 sTags = new WeakHashMap<View, SparseArray<Object>>(); 9906 } else { 9907 tags = sTags.get(view); 9908 } 9909 } 9910 9911 if (tags == null) { 9912 tags = new SparseArray<Object>(2); 9913 synchronized (sTagsLock) { 9914 sTags.put(view, tags); 9915 } 9916 } 9917 9918 tags.put(key, tag); 9919 } 9920 9921 /** 9922 * @param consistency The type of consistency. See ViewDebug for more information. 9923 * 9924 * @hide 9925 */ 9926 protected boolean dispatchConsistencyCheck(int consistency) { 9927 return onConsistencyCheck(consistency); 9928 } 9929 9930 /** 9931 * Method that subclasses should implement to check their consistency. The type of 9932 * consistency check is indicated by the bit field passed as a parameter. 9933 * 9934 * @param consistency The type of consistency. See ViewDebug for more information. 9935 * 9936 * @throws IllegalStateException if the view is in an inconsistent state. 9937 * 9938 * @hide 9939 */ 9940 protected boolean onConsistencyCheck(int consistency) { 9941 boolean result = true; 9942 9943 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 9944 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 9945 9946 if (checkLayout) { 9947 if (getParent() == null) { 9948 result = false; 9949 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 9950 "View " + this + " does not have a parent."); 9951 } 9952 9953 if (mAttachInfo == null) { 9954 result = false; 9955 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 9956 "View " + this + " is not attached to a window."); 9957 } 9958 } 9959 9960 if (checkDrawing) { 9961 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 9962 // from their draw() method 9963 9964 if ((mPrivateFlags & DRAWN) != DRAWN && 9965 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 9966 result = false; 9967 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 9968 "View " + this + " was invalidated but its drawing cache is valid."); 9969 } 9970 } 9971 9972 return result; 9973 } 9974 9975 /** 9976 * Prints information about this view in the log output, with the tag 9977 * {@link #VIEW_LOG_TAG}. 9978 * 9979 * @hide 9980 */ 9981 public void debug() { 9982 debug(0); 9983 } 9984 9985 /** 9986 * Prints information about this view in the log output, with the tag 9987 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 9988 * indentation defined by the <code>depth</code>. 9989 * 9990 * @param depth the indentation level 9991 * 9992 * @hide 9993 */ 9994 protected void debug(int depth) { 9995 String output = debugIndent(depth - 1); 9996 9997 output += "+ " + this; 9998 int id = getId(); 9999 if (id != -1) { 10000 output += " (id=" + id + ")"; 10001 } 10002 Object tag = getTag(); 10003 if (tag != null) { 10004 output += " (tag=" + tag + ")"; 10005 } 10006 Log.d(VIEW_LOG_TAG, output); 10007 10008 if ((mPrivateFlags & FOCUSED) != 0) { 10009 output = debugIndent(depth) + " FOCUSED"; 10010 Log.d(VIEW_LOG_TAG, output); 10011 } 10012 10013 output = debugIndent(depth); 10014 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 10015 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 10016 + "} "; 10017 Log.d(VIEW_LOG_TAG, output); 10018 10019 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 10020 || mPaddingBottom != 0) { 10021 output = debugIndent(depth); 10022 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 10023 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 10024 Log.d(VIEW_LOG_TAG, output); 10025 } 10026 10027 output = debugIndent(depth); 10028 output += "mMeasureWidth=" + mMeasuredWidth + 10029 " mMeasureHeight=" + mMeasuredHeight; 10030 Log.d(VIEW_LOG_TAG, output); 10031 10032 output = debugIndent(depth); 10033 if (mLayoutParams == null) { 10034 output += "BAD! no layout params"; 10035 } else { 10036 output = mLayoutParams.debug(output); 10037 } 10038 Log.d(VIEW_LOG_TAG, output); 10039 10040 output = debugIndent(depth); 10041 output += "flags={"; 10042 output += View.printFlags(mViewFlags); 10043 output += "}"; 10044 Log.d(VIEW_LOG_TAG, output); 10045 10046 output = debugIndent(depth); 10047 output += "privateFlags={"; 10048 output += View.printPrivateFlags(mPrivateFlags); 10049 output += "}"; 10050 Log.d(VIEW_LOG_TAG, output); 10051 } 10052 10053 /** 10054 * Creates an string of whitespaces used for indentation. 10055 * 10056 * @param depth the indentation level 10057 * @return a String containing (depth * 2 + 3) * 2 white spaces 10058 * 10059 * @hide 10060 */ 10061 protected static String debugIndent(int depth) { 10062 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 10063 for (int i = 0; i < (depth * 2) + 3; i++) { 10064 spaces.append(' ').append(' '); 10065 } 10066 return spaces.toString(); 10067 } 10068 10069 /** 10070 * <p>Return the offset of the widget's text baseline from the widget's top 10071 * boundary. If this widget does not support baseline alignment, this 10072 * method returns -1. </p> 10073 * 10074 * @return the offset of the baseline within the widget's bounds or -1 10075 * if baseline alignment is not supported 10076 */ 10077 @ViewDebug.ExportedProperty(category = "layout") 10078 public int getBaseline() { 10079 return -1; 10080 } 10081 10082 /** 10083 * Call this when something has changed which has invalidated the 10084 * layout of this view. This will schedule a layout pass of the view 10085 * tree. 10086 */ 10087 public void requestLayout() { 10088 if (ViewDebug.TRACE_HIERARCHY) { 10089 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 10090 } 10091 10092 mPrivateFlags |= FORCE_LAYOUT; 10093 10094 if (mParent != null && !mParent.isLayoutRequested()) { 10095 mParent.requestLayout(); 10096 } 10097 } 10098 10099 /** 10100 * Forces this view to be laid out during the next layout pass. 10101 * This method does not call requestLayout() or forceLayout() 10102 * on the parent. 10103 */ 10104 public void forceLayout() { 10105 mPrivateFlags |= FORCE_LAYOUT; 10106 } 10107 10108 /** 10109 * <p> 10110 * This is called to find out how big a view should be. The parent 10111 * supplies constraint information in the width and height parameters. 10112 * </p> 10113 * 10114 * <p> 10115 * The actual mesurement work of a view is performed in 10116 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 10117 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 10118 * </p> 10119 * 10120 * 10121 * @param widthMeasureSpec Horizontal space requirements as imposed by the 10122 * parent 10123 * @param heightMeasureSpec Vertical space requirements as imposed by the 10124 * parent 10125 * 10126 * @see #onMeasure(int, int) 10127 */ 10128 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 10129 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 10130 widthMeasureSpec != mOldWidthMeasureSpec || 10131 heightMeasureSpec != mOldHeightMeasureSpec) { 10132 10133 // first clears the measured dimension flag 10134 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 10135 10136 if (ViewDebug.TRACE_HIERARCHY) { 10137 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 10138 } 10139 10140 // measure ourselves, this should set the measured dimension flag back 10141 onMeasure(widthMeasureSpec, heightMeasureSpec); 10142 10143 // flag not set, setMeasuredDimension() was not invoked, we raise 10144 // an exception to warn the developer 10145 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 10146 throw new IllegalStateException("onMeasure() did not set the" 10147 + " measured dimension by calling" 10148 + " setMeasuredDimension()"); 10149 } 10150 10151 mPrivateFlags |= LAYOUT_REQUIRED; 10152 } 10153 10154 mOldWidthMeasureSpec = widthMeasureSpec; 10155 mOldHeightMeasureSpec = heightMeasureSpec; 10156 } 10157 10158 /** 10159 * <p> 10160 * Measure the view and its content to determine the measured width and the 10161 * measured height. This method is invoked by {@link #measure(int, int)} and 10162 * should be overriden by subclasses to provide accurate and efficient 10163 * measurement of their contents. 10164 * </p> 10165 * 10166 * <p> 10167 * <strong>CONTRACT:</strong> When overriding this method, you 10168 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 10169 * measured width and height of this view. Failure to do so will trigger an 10170 * <code>IllegalStateException</code>, thrown by 10171 * {@link #measure(int, int)}. Calling the superclass' 10172 * {@link #onMeasure(int, int)} is a valid use. 10173 * </p> 10174 * 10175 * <p> 10176 * The base class implementation of measure defaults to the background size, 10177 * unless a larger size is allowed by the MeasureSpec. Subclasses should 10178 * override {@link #onMeasure(int, int)} to provide better measurements of 10179 * their content. 10180 * </p> 10181 * 10182 * <p> 10183 * If this method is overridden, it is the subclass's responsibility to make 10184 * sure the measured height and width are at least the view's minimum height 10185 * and width ({@link #getSuggestedMinimumHeight()} and 10186 * {@link #getSuggestedMinimumWidth()}). 10187 * </p> 10188 * 10189 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 10190 * The requirements are encoded with 10191 * {@link android.view.View.MeasureSpec}. 10192 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 10193 * The requirements are encoded with 10194 * {@link android.view.View.MeasureSpec}. 10195 * 10196 * @see #getMeasuredWidth() 10197 * @see #getMeasuredHeight() 10198 * @see #setMeasuredDimension(int, int) 10199 * @see #getSuggestedMinimumHeight() 10200 * @see #getSuggestedMinimumWidth() 10201 * @see android.view.View.MeasureSpec#getMode(int) 10202 * @see android.view.View.MeasureSpec#getSize(int) 10203 */ 10204 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 10205 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 10206 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 10207 } 10208 10209 /** 10210 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 10211 * measured width and measured height. Failing to do so will trigger an 10212 * exception at measurement time.</p> 10213 * 10214 * @param measuredWidth The measured width of this view. May be a complex 10215 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10216 * {@link #MEASURED_STATE_TOO_SMALL}. 10217 * @param measuredHeight The measured height of this view. May be a complex 10218 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10219 * {@link #MEASURED_STATE_TOO_SMALL}. 10220 */ 10221 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 10222 mMeasuredWidth = measuredWidth; 10223 mMeasuredHeight = measuredHeight; 10224 10225 mPrivateFlags |= MEASURED_DIMENSION_SET; 10226 } 10227 10228 /** 10229 * Merge two states as returned by {@link #getMeasuredState()}. 10230 * @param curState The current state as returned from a view or the result 10231 * of combining multiple views. 10232 * @param newState The new view state to combine. 10233 * @return Returns a new integer reflecting the combination of the two 10234 * states. 10235 */ 10236 public static int combineMeasuredStates(int curState, int newState) { 10237 return curState | newState; 10238 } 10239 10240 /** 10241 * Version of {@link #resolveSizeAndState(int, int, int)} 10242 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 10243 */ 10244 public static int resolveSize(int size, int measureSpec) { 10245 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 10246 } 10247 10248 /** 10249 * Utility to reconcile a desired size and state, with constraints imposed 10250 * by a MeasureSpec. Will take the desired size, unless a different size 10251 * is imposed by the constraints. The returned value is a compound integer, 10252 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 10253 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 10254 * size is smaller than the size the view wants to be. 10255 * 10256 * @param size How big the view wants to be 10257 * @param measureSpec Constraints imposed by the parent 10258 * @return Size information bit mask as defined by 10259 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 10260 */ 10261 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 10262 int result = size; 10263 int specMode = MeasureSpec.getMode(measureSpec); 10264 int specSize = MeasureSpec.getSize(measureSpec); 10265 switch (specMode) { 10266 case MeasureSpec.UNSPECIFIED: 10267 result = size; 10268 break; 10269 case MeasureSpec.AT_MOST: 10270 if (specSize < size) { 10271 result = specSize | MEASURED_STATE_TOO_SMALL; 10272 } else { 10273 result = size; 10274 } 10275 break; 10276 case MeasureSpec.EXACTLY: 10277 result = specSize; 10278 break; 10279 } 10280 return result | (childMeasuredState&MEASURED_STATE_MASK); 10281 } 10282 10283 /** 10284 * Utility to return a default size. Uses the supplied size if the 10285 * MeasureSpec imposed no contraints. Will get larger if allowed 10286 * by the MeasureSpec. 10287 * 10288 * @param size Default size for this view 10289 * @param measureSpec Constraints imposed by the parent 10290 * @return The size this view should be. 10291 */ 10292 public static int getDefaultSize(int size, int measureSpec) { 10293 int result = size; 10294 int specMode = MeasureSpec.getMode(measureSpec); 10295 int specSize = MeasureSpec.getSize(measureSpec); 10296 10297 switch (specMode) { 10298 case MeasureSpec.UNSPECIFIED: 10299 result = size; 10300 break; 10301 case MeasureSpec.AT_MOST: 10302 case MeasureSpec.EXACTLY: 10303 result = specSize; 10304 break; 10305 } 10306 return result; 10307 } 10308 10309 /** 10310 * Returns the suggested minimum height that the view should use. This 10311 * returns the maximum of the view's minimum height 10312 * and the background's minimum height 10313 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 10314 * <p> 10315 * When being used in {@link #onMeasure(int, int)}, the caller should still 10316 * ensure the returned height is within the requirements of the parent. 10317 * 10318 * @return The suggested minimum height of the view. 10319 */ 10320 protected int getSuggestedMinimumHeight() { 10321 int suggestedMinHeight = mMinHeight; 10322 10323 if (mBGDrawable != null) { 10324 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 10325 if (suggestedMinHeight < bgMinHeight) { 10326 suggestedMinHeight = bgMinHeight; 10327 } 10328 } 10329 10330 return suggestedMinHeight; 10331 } 10332 10333 /** 10334 * Returns the suggested minimum width that the view should use. This 10335 * returns the maximum of the view's minimum width) 10336 * and the background's minimum width 10337 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 10338 * <p> 10339 * When being used in {@link #onMeasure(int, int)}, the caller should still 10340 * ensure the returned width is within the requirements of the parent. 10341 * 10342 * @return The suggested minimum width of the view. 10343 */ 10344 protected int getSuggestedMinimumWidth() { 10345 int suggestedMinWidth = mMinWidth; 10346 10347 if (mBGDrawable != null) { 10348 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 10349 if (suggestedMinWidth < bgMinWidth) { 10350 suggestedMinWidth = bgMinWidth; 10351 } 10352 } 10353 10354 return suggestedMinWidth; 10355 } 10356 10357 /** 10358 * Sets the minimum height of the view. It is not guaranteed the view will 10359 * be able to achieve this minimum height (for example, if its parent layout 10360 * constrains it with less available height). 10361 * 10362 * @param minHeight The minimum height the view will try to be. 10363 */ 10364 public void setMinimumHeight(int minHeight) { 10365 mMinHeight = minHeight; 10366 } 10367 10368 /** 10369 * Sets the minimum width of the view. It is not guaranteed the view will 10370 * be able to achieve this minimum width (for example, if its parent layout 10371 * constrains it with less available width). 10372 * 10373 * @param minWidth The minimum width the view will try to be. 10374 */ 10375 public void setMinimumWidth(int minWidth) { 10376 mMinWidth = minWidth; 10377 } 10378 10379 /** 10380 * Get the animation currently associated with this view. 10381 * 10382 * @return The animation that is currently playing or 10383 * scheduled to play for this view. 10384 */ 10385 public Animation getAnimation() { 10386 return mCurrentAnimation; 10387 } 10388 10389 /** 10390 * Start the specified animation now. 10391 * 10392 * @param animation the animation to start now 10393 */ 10394 public void startAnimation(Animation animation) { 10395 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 10396 setAnimation(animation); 10397 invalidate(); 10398 } 10399 10400 /** 10401 * Cancels any animations for this view. 10402 */ 10403 public void clearAnimation() { 10404 if (mCurrentAnimation != null) { 10405 mCurrentAnimation.detach(); 10406 } 10407 mCurrentAnimation = null; 10408 } 10409 10410 /** 10411 * Sets the next animation to play for this view. 10412 * If you want the animation to play immediately, use 10413 * startAnimation. This method provides allows fine-grained 10414 * control over the start time and invalidation, but you 10415 * must make sure that 1) the animation has a start time set, and 10416 * 2) the view will be invalidated when the animation is supposed to 10417 * start. 10418 * 10419 * @param animation The next animation, or null. 10420 */ 10421 public void setAnimation(Animation animation) { 10422 mCurrentAnimation = animation; 10423 if (animation != null) { 10424 animation.reset(); 10425 } 10426 } 10427 10428 /** 10429 * Invoked by a parent ViewGroup to notify the start of the animation 10430 * currently associated with this view. If you override this method, 10431 * always call super.onAnimationStart(); 10432 * 10433 * @see #setAnimation(android.view.animation.Animation) 10434 * @see #getAnimation() 10435 */ 10436 protected void onAnimationStart() { 10437 mPrivateFlags |= ANIMATION_STARTED; 10438 } 10439 10440 /** 10441 * Invoked by a parent ViewGroup to notify the end of the animation 10442 * currently associated with this view. If you override this method, 10443 * always call super.onAnimationEnd(); 10444 * 10445 * @see #setAnimation(android.view.animation.Animation) 10446 * @see #getAnimation() 10447 */ 10448 protected void onAnimationEnd() { 10449 mPrivateFlags &= ~ANIMATION_STARTED; 10450 } 10451 10452 /** 10453 * Invoked if there is a Transform that involves alpha. Subclass that can 10454 * draw themselves with the specified alpha should return true, and then 10455 * respect that alpha when their onDraw() is called. If this returns false 10456 * then the view may be redirected to draw into an offscreen buffer to 10457 * fulfill the request, which will look fine, but may be slower than if the 10458 * subclass handles it internally. The default implementation returns false. 10459 * 10460 * @param alpha The alpha (0..255) to apply to the view's drawing 10461 * @return true if the view can draw with the specified alpha. 10462 */ 10463 protected boolean onSetAlpha(int alpha) { 10464 return false; 10465 } 10466 10467 /** 10468 * This is used by the RootView to perform an optimization when 10469 * the view hierarchy contains one or several SurfaceView. 10470 * SurfaceView is always considered transparent, but its children are not, 10471 * therefore all View objects remove themselves from the global transparent 10472 * region (passed as a parameter to this function). 10473 * 10474 * @param region The transparent region for this ViewRoot (window). 10475 * 10476 * @return Returns true if the effective visibility of the view at this 10477 * point is opaque, regardless of the transparent region; returns false 10478 * if it is possible for underlying windows to be seen behind the view. 10479 * 10480 * {@hide} 10481 */ 10482 public boolean gatherTransparentRegion(Region region) { 10483 final AttachInfo attachInfo = mAttachInfo; 10484 if (region != null && attachInfo != null) { 10485 final int pflags = mPrivateFlags; 10486 if ((pflags & SKIP_DRAW) == 0) { 10487 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 10488 // remove it from the transparent region. 10489 final int[] location = attachInfo.mTransparentLocation; 10490 getLocationInWindow(location); 10491 region.op(location[0], location[1], location[0] + mRight - mLeft, 10492 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 10493 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 10494 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 10495 // exists, so we remove the background drawable's non-transparent 10496 // parts from this transparent region. 10497 applyDrawableToTransparentRegion(mBGDrawable, region); 10498 } 10499 } 10500 return true; 10501 } 10502 10503 /** 10504 * Play a sound effect for this view. 10505 * 10506 * <p>The framework will play sound effects for some built in actions, such as 10507 * clicking, but you may wish to play these effects in your widget, 10508 * for instance, for internal navigation. 10509 * 10510 * <p>The sound effect will only be played if sound effects are enabled by the user, and 10511 * {@link #isSoundEffectsEnabled()} is true. 10512 * 10513 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 10514 */ 10515 public void playSoundEffect(int soundConstant) { 10516 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 10517 return; 10518 } 10519 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 10520 } 10521 10522 /** 10523 * BZZZTT!!1! 10524 * 10525 * <p>Provide haptic feedback to the user for this view. 10526 * 10527 * <p>The framework will provide haptic feedback for some built in actions, 10528 * such as long presses, but you may wish to provide feedback for your 10529 * own widget. 10530 * 10531 * <p>The feedback will only be performed if 10532 * {@link #isHapticFeedbackEnabled()} is true. 10533 * 10534 * @param feedbackConstant One of the constants defined in 10535 * {@link HapticFeedbackConstants} 10536 */ 10537 public boolean performHapticFeedback(int feedbackConstant) { 10538 return performHapticFeedback(feedbackConstant, 0); 10539 } 10540 10541 /** 10542 * BZZZTT!!1! 10543 * 10544 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 10545 * 10546 * @param feedbackConstant One of the constants defined in 10547 * {@link HapticFeedbackConstants} 10548 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 10549 */ 10550 public boolean performHapticFeedback(int feedbackConstant, int flags) { 10551 if (mAttachInfo == null) { 10552 return false; 10553 } 10554 //noinspection SimplifiableIfStatement 10555 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 10556 && !isHapticFeedbackEnabled()) { 10557 return false; 10558 } 10559 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 10560 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 10561 } 10562 10563 /** 10564 * !!! TODO: real docs 10565 * 10566 * The base class implementation makes the shadow the same size and appearance 10567 * as the view itself, and positions it with its center at the touch point. 10568 */ 10569 public static class DragShadowBuilder { 10570 private final WeakReference<View> mView; 10571 10572 /** 10573 * Construct a shadow builder object for use with the given view. 10574 * @param view 10575 */ 10576 public DragShadowBuilder(View view) { 10577 mView = new WeakReference<View>(view); 10578 } 10579 10580 final public View getView() { 10581 return mView.get(); 10582 } 10583 10584 /** 10585 * Provide the draggable-shadow metrics for the operation: the dimensions of 10586 * the shadow image itself, and the point within that shadow that should 10587 * be centered under the touch location while dragging. 10588 * <p> 10589 * The default implementation sets the dimensions of the shadow to be the 10590 * same as the dimensions of the View itself and centers the shadow under 10591 * the touch point. 10592 * 10593 * @param shadowSize The application should set the {@code x} member of this 10594 * parameter to the desired shadow width, and the {@code y} member to 10595 * the desired height. 10596 * @param shadowTouchPoint The application should set this point to be the 10597 * location within the shadow that should track directly underneath 10598 * the touch point on the screen during a drag. 10599 */ 10600 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 10601 final View view = mView.get(); 10602 if (view != null) { 10603 shadowSize.set(view.getWidth(), view.getHeight()); 10604 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 10605 } else { 10606 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 10607 } 10608 } 10609 10610 /** 10611 * Draw the shadow image for the upcoming drag. The shadow canvas was 10612 * created with the dimensions supplied by the 10613 * {@link #onProvideShadowMetrics(Point, Point)} callback. 10614 * 10615 * @param canvas 10616 */ 10617 public void onDrawShadow(Canvas canvas) { 10618 final View view = mView.get(); 10619 if (view != null) { 10620 view.draw(canvas); 10621 } else { 10622 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 10623 } 10624 } 10625 } 10626 10627 /** 10628 * Drag and drop. App calls startDrag(), then callbacks to the shadow builder's 10629 * {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} and 10630 * {@link DragShadowBuilder#onDrawShadow(Canvas)} methods happen, then the drag 10631 * operation is handed over to the OS. 10632 * !!! TODO: real docs 10633 * 10634 * @param data !!! TODO 10635 * @param shadowBuilder !!! TODO 10636 * @param myWindowOnly When {@code true}, indicates that the drag operation should be 10637 * restricted to the calling application. In this case only the calling application 10638 * will see any DragEvents related to this drag operation. 10639 * @param myLocalState An arbitrary object that will be passed as part of every DragEvent 10640 * delivered to the calling application during the course of the current drag operation. 10641 * This object is private to the application that called startDrag(), and is not 10642 * visible to other applications. It provides a lightweight way for the application to 10643 * propagate information from the initiator to the recipient of a drag within its own 10644 * application; for example, to help disambiguate between 'copy' and 'move' semantics. 10645 * @return {@code true} if the drag operation was initiated successfully; {@code false} if 10646 * an error prevented the drag from taking place. 10647 */ 10648 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 10649 boolean myWindowOnly, Object myLocalState) { 10650 if (ViewDebug.DEBUG_DRAG) { 10651 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " local=" + myWindowOnly); 10652 } 10653 boolean okay = false; 10654 10655 Point shadowSize = new Point(); 10656 Point shadowTouchPoint = new Point(); 10657 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 10658 10659 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 10660 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 10661 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 10662 } 10663 10664 if (ViewDebug.DEBUG_DRAG) { 10665 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 10666 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 10667 } 10668 Surface surface = new Surface(); 10669 try { 10670 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 10671 myWindowOnly, shadowSize.x, shadowSize.y, surface); 10672 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 10673 + " surface=" + surface); 10674 if (token != null) { 10675 Canvas canvas = surface.lockCanvas(null); 10676 try { 10677 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 10678 shadowBuilder.onDrawShadow(canvas); 10679 } finally { 10680 surface.unlockCanvasAndPost(canvas); 10681 } 10682 10683 final ViewRoot root = getViewRoot(); 10684 10685 // Cache the local state object for delivery with DragEvents 10686 root.setLocalDragState(myLocalState); 10687 10688 // repurpose 'shadowSize' for the last touch point 10689 root.getLastTouchPoint(shadowSize); 10690 10691 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 10692 shadowSize.x, shadowSize.y, 10693 shadowTouchPoint.x, shadowTouchPoint.y, data); 10694 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 10695 } 10696 } catch (Exception e) { 10697 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 10698 surface.destroy(); 10699 } 10700 10701 return okay; 10702 } 10703 10704 /** 10705 * Drag-and-drop event dispatch. The event.getAction() verb is one of the DragEvent 10706 * constants DRAG_STARTED_EVENT, DRAG_EVENT, DROP_EVENT, and DRAG_ENDED_EVENT. 10707 * 10708 * For DRAG_STARTED_EVENT, event.getClipDescription() describes the content 10709 * being dragged. onDragEvent() should return 'true' if the view can handle 10710 * a drop of that content. A view that returns 'false' here will receive no 10711 * further calls to onDragEvent() about the drag/drop operation. 10712 * 10713 * For DRAG_ENTERED, event.getClipDescription() describes the content being 10714 * dragged. This will be the same content description passed in the 10715 * DRAG_STARTED_EVENT invocation. 10716 * 10717 * For DRAG_EXITED, event.getClipDescription() describes the content being 10718 * dragged. This will be the same content description passed in the 10719 * DRAG_STARTED_EVENT invocation. The view should return to its approriate 10720 * drag-acceptance visual state. 10721 * 10722 * For DRAG_LOCATION_EVENT, event.getX() and event.getY() give the location in View 10723 * coordinates of the current drag point. The view must return 'true' if it 10724 * can accept a drop of the current drag content, false otherwise. 10725 * 10726 * For DROP_EVENT, event.getX() and event.getY() give the location of the drop 10727 * within the view; also, event.getClipData() returns the full data payload 10728 * being dropped. The view should return 'true' if it consumed the dropped 10729 * content, 'false' if it did not. 10730 * 10731 * For DRAG_ENDED_EVENT, the 'event' argument may be null. The view should return 10732 * to its normal visual state. 10733 */ 10734 public boolean onDragEvent(DragEvent event) { 10735 return false; 10736 } 10737 10738 /** 10739 * Views typically don't need to override dispatchDragEvent(); it just calls 10740 * onDragEvent(event) and passes the result up appropriately. 10741 */ 10742 public boolean dispatchDragEvent(DragEvent event) { 10743 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 10744 && mOnDragListener.onDrag(this, event)) { 10745 return true; 10746 } 10747 return onDragEvent(event); 10748 } 10749 10750 /** 10751 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 10752 * it is ever exposed at all. 10753 * @hide 10754 */ 10755 public void onCloseSystemDialogs(String reason) { 10756 } 10757 10758 /** 10759 * Given a Drawable whose bounds have been set to draw into this view, 10760 * update a Region being computed for {@link #gatherTransparentRegion} so 10761 * that any non-transparent parts of the Drawable are removed from the 10762 * given transparent region. 10763 * 10764 * @param dr The Drawable whose transparency is to be applied to the region. 10765 * @param region A Region holding the current transparency information, 10766 * where any parts of the region that are set are considered to be 10767 * transparent. On return, this region will be modified to have the 10768 * transparency information reduced by the corresponding parts of the 10769 * Drawable that are not transparent. 10770 * {@hide} 10771 */ 10772 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 10773 if (DBG) { 10774 Log.i("View", "Getting transparent region for: " + this); 10775 } 10776 final Region r = dr.getTransparentRegion(); 10777 final Rect db = dr.getBounds(); 10778 final AttachInfo attachInfo = mAttachInfo; 10779 if (r != null && attachInfo != null) { 10780 final int w = getRight()-getLeft(); 10781 final int h = getBottom()-getTop(); 10782 if (db.left > 0) { 10783 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 10784 r.op(0, 0, db.left, h, Region.Op.UNION); 10785 } 10786 if (db.right < w) { 10787 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 10788 r.op(db.right, 0, w, h, Region.Op.UNION); 10789 } 10790 if (db.top > 0) { 10791 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 10792 r.op(0, 0, w, db.top, Region.Op.UNION); 10793 } 10794 if (db.bottom < h) { 10795 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 10796 r.op(0, db.bottom, w, h, Region.Op.UNION); 10797 } 10798 final int[] location = attachInfo.mTransparentLocation; 10799 getLocationInWindow(location); 10800 r.translate(location[0], location[1]); 10801 region.op(r, Region.Op.INTERSECT); 10802 } else { 10803 region.op(db, Region.Op.DIFFERENCE); 10804 } 10805 } 10806 10807 private void postCheckForLongClick(int delayOffset) { 10808 mHasPerformedLongPress = false; 10809 10810 if (mPendingCheckForLongPress == null) { 10811 mPendingCheckForLongPress = new CheckForLongPress(); 10812 } 10813 mPendingCheckForLongPress.rememberWindowAttachCount(); 10814 postDelayed(mPendingCheckForLongPress, 10815 ViewConfiguration.getLongPressTimeout() - delayOffset); 10816 } 10817 10818 /** 10819 * Inflate a view from an XML resource. This convenience method wraps the {@link 10820 * LayoutInflater} class, which provides a full range of options for view inflation. 10821 * 10822 * @param context The Context object for your activity or application. 10823 * @param resource The resource ID to inflate 10824 * @param root A view group that will be the parent. Used to properly inflate the 10825 * layout_* parameters. 10826 * @see LayoutInflater 10827 */ 10828 public static View inflate(Context context, int resource, ViewGroup root) { 10829 LayoutInflater factory = LayoutInflater.from(context); 10830 return factory.inflate(resource, root); 10831 } 10832 10833 /** 10834 * Scroll the view with standard behavior for scrolling beyond the normal 10835 * content boundaries. Views that call this method should override 10836 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 10837 * results of an over-scroll operation. 10838 * 10839 * Views can use this method to handle any touch or fling-based scrolling. 10840 * 10841 * @param deltaX Change in X in pixels 10842 * @param deltaY Change in Y in pixels 10843 * @param scrollX Current X scroll value in pixels before applying deltaX 10844 * @param scrollY Current Y scroll value in pixels before applying deltaY 10845 * @param scrollRangeX Maximum content scroll range along the X axis 10846 * @param scrollRangeY Maximum content scroll range along the Y axis 10847 * @param maxOverScrollX Number of pixels to overscroll by in either direction 10848 * along the X axis. 10849 * @param maxOverScrollY Number of pixels to overscroll by in either direction 10850 * along the Y axis. 10851 * @param isTouchEvent true if this scroll operation is the result of a touch event. 10852 * @return true if scrolling was clamped to an over-scroll boundary along either 10853 * axis, false otherwise. 10854 */ 10855 protected boolean overScrollBy(int deltaX, int deltaY, 10856 int scrollX, int scrollY, 10857 int scrollRangeX, int scrollRangeY, 10858 int maxOverScrollX, int maxOverScrollY, 10859 boolean isTouchEvent) { 10860 final int overScrollMode = mOverScrollMode; 10861 final boolean canScrollHorizontal = 10862 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 10863 final boolean canScrollVertical = 10864 computeVerticalScrollRange() > computeVerticalScrollExtent(); 10865 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 10866 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 10867 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 10868 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 10869 10870 int newScrollX = scrollX + deltaX; 10871 if (!overScrollHorizontal) { 10872 maxOverScrollX = 0; 10873 } 10874 10875 int newScrollY = scrollY + deltaY; 10876 if (!overScrollVertical) { 10877 maxOverScrollY = 0; 10878 } 10879 10880 // Clamp values if at the limits and record 10881 final int left = -maxOverScrollX; 10882 final int right = maxOverScrollX + scrollRangeX; 10883 final int top = -maxOverScrollY; 10884 final int bottom = maxOverScrollY + scrollRangeY; 10885 10886 boolean clampedX = false; 10887 if (newScrollX > right) { 10888 newScrollX = right; 10889 clampedX = true; 10890 } else if (newScrollX < left) { 10891 newScrollX = left; 10892 clampedX = true; 10893 } 10894 10895 boolean clampedY = false; 10896 if (newScrollY > bottom) { 10897 newScrollY = bottom; 10898 clampedY = true; 10899 } else if (newScrollY < top) { 10900 newScrollY = top; 10901 clampedY = true; 10902 } 10903 10904 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 10905 10906 return clampedX || clampedY; 10907 } 10908 10909 /** 10910 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 10911 * respond to the results of an over-scroll operation. 10912 * 10913 * @param scrollX New X scroll value in pixels 10914 * @param scrollY New Y scroll value in pixels 10915 * @param clampedX True if scrollX was clamped to an over-scroll boundary 10916 * @param clampedY True if scrollY was clamped to an over-scroll boundary 10917 */ 10918 protected void onOverScrolled(int scrollX, int scrollY, 10919 boolean clampedX, boolean clampedY) { 10920 // Intentionally empty. 10921 } 10922 10923 /** 10924 * Returns the over-scroll mode for this view. The result will be 10925 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 10926 * (allow over-scrolling only if the view content is larger than the container), 10927 * or {@link #OVER_SCROLL_NEVER}. 10928 * 10929 * @return This view's over-scroll mode. 10930 */ 10931 public int getOverScrollMode() { 10932 return mOverScrollMode; 10933 } 10934 10935 /** 10936 * Set the over-scroll mode for this view. Valid over-scroll modes are 10937 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 10938 * (allow over-scrolling only if the view content is larger than the container), 10939 * or {@link #OVER_SCROLL_NEVER}. 10940 * 10941 * Setting the over-scroll mode of a view will have an effect only if the 10942 * view is capable of scrolling. 10943 * 10944 * @param overScrollMode The new over-scroll mode for this view. 10945 */ 10946 public void setOverScrollMode(int overScrollMode) { 10947 if (overScrollMode != OVER_SCROLL_ALWAYS && 10948 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 10949 overScrollMode != OVER_SCROLL_NEVER) { 10950 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 10951 } 10952 mOverScrollMode = overScrollMode; 10953 } 10954 10955 /** 10956 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 10957 * Each MeasureSpec represents a requirement for either the width or the height. 10958 * A MeasureSpec is comprised of a size and a mode. There are three possible 10959 * modes: 10960 * <dl> 10961 * <dt>UNSPECIFIED</dt> 10962 * <dd> 10963 * The parent has not imposed any constraint on the child. It can be whatever size 10964 * it wants. 10965 * </dd> 10966 * 10967 * <dt>EXACTLY</dt> 10968 * <dd> 10969 * The parent has determined an exact size for the child. The child is going to be 10970 * given those bounds regardless of how big it wants to be. 10971 * </dd> 10972 * 10973 * <dt>AT_MOST</dt> 10974 * <dd> 10975 * The child can be as large as it wants up to the specified size. 10976 * </dd> 10977 * </dl> 10978 * 10979 * MeasureSpecs are implemented as ints to reduce object allocation. This class 10980 * is provided to pack and unpack the <size, mode> tuple into the int. 10981 */ 10982 public static class MeasureSpec { 10983 private static final int MODE_SHIFT = 30; 10984 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 10985 10986 /** 10987 * Measure specification mode: The parent has not imposed any constraint 10988 * on the child. It can be whatever size it wants. 10989 */ 10990 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 10991 10992 /** 10993 * Measure specification mode: The parent has determined an exact size 10994 * for the child. The child is going to be given those bounds regardless 10995 * of how big it wants to be. 10996 */ 10997 public static final int EXACTLY = 1 << MODE_SHIFT; 10998 10999 /** 11000 * Measure specification mode: The child can be as large as it wants up 11001 * to the specified size. 11002 */ 11003 public static final int AT_MOST = 2 << MODE_SHIFT; 11004 11005 /** 11006 * Creates a measure specification based on the supplied size and mode. 11007 * 11008 * The mode must always be one of the following: 11009 * <ul> 11010 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 11011 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 11012 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 11013 * </ul> 11014 * 11015 * @param size the size of the measure specification 11016 * @param mode the mode of the measure specification 11017 * @return the measure specification based on size and mode 11018 */ 11019 public static int makeMeasureSpec(int size, int mode) { 11020 return size + mode; 11021 } 11022 11023 /** 11024 * Extracts the mode from the supplied measure specification. 11025 * 11026 * @param measureSpec the measure specification to extract the mode from 11027 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 11028 * {@link android.view.View.MeasureSpec#AT_MOST} or 11029 * {@link android.view.View.MeasureSpec#EXACTLY} 11030 */ 11031 public static int getMode(int measureSpec) { 11032 return (measureSpec & MODE_MASK); 11033 } 11034 11035 /** 11036 * Extracts the size from the supplied measure specification. 11037 * 11038 * @param measureSpec the measure specification to extract the size from 11039 * @return the size in pixels defined in the supplied measure specification 11040 */ 11041 public static int getSize(int measureSpec) { 11042 return (measureSpec & ~MODE_MASK); 11043 } 11044 11045 /** 11046 * Returns a String representation of the specified measure 11047 * specification. 11048 * 11049 * @param measureSpec the measure specification to convert to a String 11050 * @return a String with the following format: "MeasureSpec: MODE SIZE" 11051 */ 11052 public static String toString(int measureSpec) { 11053 int mode = getMode(measureSpec); 11054 int size = getSize(measureSpec); 11055 11056 StringBuilder sb = new StringBuilder("MeasureSpec: "); 11057 11058 if (mode == UNSPECIFIED) 11059 sb.append("UNSPECIFIED "); 11060 else if (mode == EXACTLY) 11061 sb.append("EXACTLY "); 11062 else if (mode == AT_MOST) 11063 sb.append("AT_MOST "); 11064 else 11065 sb.append(mode).append(" "); 11066 11067 sb.append(size); 11068 return sb.toString(); 11069 } 11070 } 11071 11072 class CheckForLongPress implements Runnable { 11073 11074 private int mOriginalWindowAttachCount; 11075 11076 public void run() { 11077 if (isPressed() && (mParent != null) 11078 && mOriginalWindowAttachCount == mWindowAttachCount) { 11079 if (performLongClick()) { 11080 mHasPerformedLongPress = true; 11081 } 11082 } 11083 } 11084 11085 public void rememberWindowAttachCount() { 11086 mOriginalWindowAttachCount = mWindowAttachCount; 11087 } 11088 } 11089 11090 private final class CheckForTap implements Runnable { 11091 public void run() { 11092 mPrivateFlags &= ~PREPRESSED; 11093 mPrivateFlags |= PRESSED; 11094 refreshDrawableState(); 11095 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 11096 postCheckForLongClick(ViewConfiguration.getTapTimeout()); 11097 } 11098 } 11099 } 11100 11101 private final class PerformClick implements Runnable { 11102 public void run() { 11103 performClick(); 11104 } 11105 } 11106 11107 /** 11108 * Interface definition for a callback to be invoked when a key event is 11109 * dispatched to this view. The callback will be invoked before the key 11110 * event is given to the view. 11111 */ 11112 public interface OnKeyListener { 11113 /** 11114 * Called when a key is dispatched to a view. This allows listeners to 11115 * get a chance to respond before the target view. 11116 * 11117 * @param v The view the key has been dispatched to. 11118 * @param keyCode The code for the physical key that was pressed 11119 * @param event The KeyEvent object containing full information about 11120 * the event. 11121 * @return True if the listener has consumed the event, false otherwise. 11122 */ 11123 boolean onKey(View v, int keyCode, KeyEvent event); 11124 } 11125 11126 /** 11127 * Interface definition for a callback to be invoked when a touch event is 11128 * dispatched to this view. The callback will be invoked before the touch 11129 * event is given to the view. 11130 */ 11131 public interface OnTouchListener { 11132 /** 11133 * Called when a touch event is dispatched to a view. This allows listeners to 11134 * get a chance to respond before the target view. 11135 * 11136 * @param v The view the touch event has been dispatched to. 11137 * @param event The MotionEvent object containing full information about 11138 * the event. 11139 * @return True if the listener has consumed the event, false otherwise. 11140 */ 11141 boolean onTouch(View v, MotionEvent event); 11142 } 11143 11144 /** 11145 * Interface definition for a callback to be invoked when a view has been clicked and held. 11146 */ 11147 public interface OnLongClickListener { 11148 /** 11149 * Called when a view has been clicked and held. 11150 * 11151 * @param v The view that was clicked and held. 11152 * 11153 * @return true if the callback consumed the long click, false otherwise. 11154 */ 11155 boolean onLongClick(View v); 11156 } 11157 11158 /** 11159 * Interface definition for a callback to be invoked when a drag is being dispatched 11160 * to this view. The callback will be invoked before the hosting view's own 11161 * onDrag(event) method. If the listener wants to fall back to the hosting view's 11162 * onDrag(event) behavior, it should return 'false' from this callback. 11163 */ 11164 public interface OnDragListener { 11165 /** 11166 * Called when a drag event is dispatched to a view. This allows listeners 11167 * to get a chance to override base View behavior. 11168 * 11169 * @param v The view the drag has been dispatched to. 11170 * @param event The DragEvent object containing full information 11171 * about the event. 11172 * @return true if the listener consumed the DragEvent, false in order to fall 11173 * back to the view's default handling. 11174 */ 11175 boolean onDrag(View v, DragEvent event); 11176 } 11177 11178 /** 11179 * Interface definition for a callback to be invoked when the focus state of 11180 * a view changed. 11181 */ 11182 public interface OnFocusChangeListener { 11183 /** 11184 * Called when the focus state of a view has changed. 11185 * 11186 * @param v The view whose state has changed. 11187 * @param hasFocus The new focus state of v. 11188 */ 11189 void onFocusChange(View v, boolean hasFocus); 11190 } 11191 11192 /** 11193 * Interface definition for a callback to be invoked when a view is clicked. 11194 */ 11195 public interface OnClickListener { 11196 /** 11197 * Called when a view has been clicked. 11198 * 11199 * @param v The view that was clicked. 11200 */ 11201 void onClick(View v); 11202 } 11203 11204 /** 11205 * Interface definition for a callback to be invoked when the context menu 11206 * for this view is being built. 11207 */ 11208 public interface OnCreateContextMenuListener { 11209 /** 11210 * Called when the context menu for this view is being built. It is not 11211 * safe to hold onto the menu after this method returns. 11212 * 11213 * @param menu The context menu that is being built 11214 * @param v The view for which the context menu is being built 11215 * @param menuInfo Extra information about the item for which the 11216 * context menu should be shown. This information will vary 11217 * depending on the class of v. 11218 */ 11219 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 11220 } 11221 11222 private final class UnsetPressedState implements Runnable { 11223 public void run() { 11224 setPressed(false); 11225 } 11226 } 11227 11228 /** 11229 * Base class for derived classes that want to save and restore their own 11230 * state in {@link android.view.View#onSaveInstanceState()}. 11231 */ 11232 public static class BaseSavedState extends AbsSavedState { 11233 /** 11234 * Constructor used when reading from a parcel. Reads the state of the superclass. 11235 * 11236 * @param source 11237 */ 11238 public BaseSavedState(Parcel source) { 11239 super(source); 11240 } 11241 11242 /** 11243 * Constructor called by derived classes when creating their SavedState objects 11244 * 11245 * @param superState The state of the superclass of this view 11246 */ 11247 public BaseSavedState(Parcelable superState) { 11248 super(superState); 11249 } 11250 11251 public static final Parcelable.Creator<BaseSavedState> CREATOR = 11252 new Parcelable.Creator<BaseSavedState>() { 11253 public BaseSavedState createFromParcel(Parcel in) { 11254 return new BaseSavedState(in); 11255 } 11256 11257 public BaseSavedState[] newArray(int size) { 11258 return new BaseSavedState[size]; 11259 } 11260 }; 11261 } 11262 11263 /** 11264 * A set of information given to a view when it is attached to its parent 11265 * window. 11266 */ 11267 static class AttachInfo { 11268 interface Callbacks { 11269 void playSoundEffect(int effectId); 11270 boolean performHapticFeedback(int effectId, boolean always); 11271 } 11272 11273 /** 11274 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 11275 * to a Handler. This class contains the target (View) to invalidate and 11276 * the coordinates of the dirty rectangle. 11277 * 11278 * For performance purposes, this class also implements a pool of up to 11279 * POOL_LIMIT objects that get reused. This reduces memory allocations 11280 * whenever possible. 11281 */ 11282 static class InvalidateInfo implements Poolable<InvalidateInfo> { 11283 private static final int POOL_LIMIT = 10; 11284 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 11285 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 11286 public InvalidateInfo newInstance() { 11287 return new InvalidateInfo(); 11288 } 11289 11290 public void onAcquired(InvalidateInfo element) { 11291 } 11292 11293 public void onReleased(InvalidateInfo element) { 11294 } 11295 }, POOL_LIMIT) 11296 ); 11297 11298 private InvalidateInfo mNext; 11299 11300 View target; 11301 11302 int left; 11303 int top; 11304 int right; 11305 int bottom; 11306 11307 public void setNextPoolable(InvalidateInfo element) { 11308 mNext = element; 11309 } 11310 11311 public InvalidateInfo getNextPoolable() { 11312 return mNext; 11313 } 11314 11315 static InvalidateInfo acquire() { 11316 return sPool.acquire(); 11317 } 11318 11319 void release() { 11320 sPool.release(this); 11321 } 11322 } 11323 11324 final IWindowSession mSession; 11325 11326 final IWindow mWindow; 11327 11328 final IBinder mWindowToken; 11329 11330 final Callbacks mRootCallbacks; 11331 11332 /** 11333 * The top view of the hierarchy. 11334 */ 11335 View mRootView; 11336 11337 IBinder mPanelParentWindowToken; 11338 Surface mSurface; 11339 11340 boolean mHardwareAccelerated; 11341 boolean mHardwareAccelerationRequested; 11342 HardwareRenderer mHardwareRenderer; 11343 11344 /** 11345 * Scale factor used by the compatibility mode 11346 */ 11347 float mApplicationScale; 11348 11349 /** 11350 * Indicates whether the application is in compatibility mode 11351 */ 11352 boolean mScalingRequired; 11353 11354 /** 11355 * Left position of this view's window 11356 */ 11357 int mWindowLeft; 11358 11359 /** 11360 * Top position of this view's window 11361 */ 11362 int mWindowTop; 11363 11364 /** 11365 * Indicates whether views need to use 32-bit drawing caches 11366 */ 11367 boolean mUse32BitDrawingCache; 11368 11369 /** 11370 * For windows that are full-screen but using insets to layout inside 11371 * of the screen decorations, these are the current insets for the 11372 * content of the window. 11373 */ 11374 final Rect mContentInsets = new Rect(); 11375 11376 /** 11377 * For windows that are full-screen but using insets to layout inside 11378 * of the screen decorations, these are the current insets for the 11379 * actual visible parts of the window. 11380 */ 11381 final Rect mVisibleInsets = new Rect(); 11382 11383 /** 11384 * The internal insets given by this window. This value is 11385 * supplied by the client (through 11386 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 11387 * be given to the window manager when changed to be used in laying 11388 * out windows behind it. 11389 */ 11390 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 11391 = new ViewTreeObserver.InternalInsetsInfo(); 11392 11393 /** 11394 * All views in the window's hierarchy that serve as scroll containers, 11395 * used to determine if the window can be resized or must be panned 11396 * to adjust for a soft input area. 11397 */ 11398 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 11399 11400 final KeyEvent.DispatcherState mKeyDispatchState 11401 = new KeyEvent.DispatcherState(); 11402 11403 /** 11404 * Indicates whether the view's window currently has the focus. 11405 */ 11406 boolean mHasWindowFocus; 11407 11408 /** 11409 * The current visibility of the window. 11410 */ 11411 int mWindowVisibility; 11412 11413 /** 11414 * Indicates the time at which drawing started to occur. 11415 */ 11416 long mDrawingTime; 11417 11418 /** 11419 * Indicates whether or not ignoring the DIRTY_MASK flags. 11420 */ 11421 boolean mIgnoreDirtyState; 11422 11423 /** 11424 * Indicates whether the view's window is currently in touch mode. 11425 */ 11426 boolean mInTouchMode; 11427 11428 /** 11429 * Indicates that ViewRoot should trigger a global layout change 11430 * the next time it performs a traversal 11431 */ 11432 boolean mRecomputeGlobalAttributes; 11433 11434 /** 11435 * Set during a traveral if any views want to keep the screen on. 11436 */ 11437 boolean mKeepScreenOn; 11438 11439 /** 11440 * Set if the visibility of any views has changed. 11441 */ 11442 boolean mViewVisibilityChanged; 11443 11444 /** 11445 * Set to true if a view has been scrolled. 11446 */ 11447 boolean mViewScrollChanged; 11448 11449 /** 11450 * Global to the view hierarchy used as a temporary for dealing with 11451 * x/y points in the transparent region computations. 11452 */ 11453 final int[] mTransparentLocation = new int[2]; 11454 11455 /** 11456 * Global to the view hierarchy used as a temporary for dealing with 11457 * x/y points in the ViewGroup.invalidateChild implementation. 11458 */ 11459 final int[] mInvalidateChildLocation = new int[2]; 11460 11461 11462 /** 11463 * Global to the view hierarchy used as a temporary for dealing with 11464 * x/y location when view is transformed. 11465 */ 11466 final float[] mTmpTransformLocation = new float[2]; 11467 11468 /** 11469 * The view tree observer used to dispatch global events like 11470 * layout, pre-draw, touch mode change, etc. 11471 */ 11472 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 11473 11474 /** 11475 * A Canvas used by the view hierarchy to perform bitmap caching. 11476 */ 11477 Canvas mCanvas; 11478 11479 /** 11480 * A Handler supplied by a view's {@link android.view.ViewRoot}. This 11481 * handler can be used to pump events in the UI events queue. 11482 */ 11483 final Handler mHandler; 11484 11485 /** 11486 * Identifier for messages requesting the view to be invalidated. 11487 * Such messages should be sent to {@link #mHandler}. 11488 */ 11489 static final int INVALIDATE_MSG = 0x1; 11490 11491 /** 11492 * Identifier for messages requesting the view to invalidate a region. 11493 * Such messages should be sent to {@link #mHandler}. 11494 */ 11495 static final int INVALIDATE_RECT_MSG = 0x2; 11496 11497 /** 11498 * Temporary for use in computing invalidate rectangles while 11499 * calling up the hierarchy. 11500 */ 11501 final Rect mTmpInvalRect = new Rect(); 11502 11503 /** 11504 * Temporary for use in computing hit areas with transformed views 11505 */ 11506 final RectF mTmpTransformRect = new RectF(); 11507 11508 /** 11509 * Temporary list for use in collecting focusable descendents of a view. 11510 */ 11511 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 11512 11513 /** 11514 * Creates a new set of attachment information with the specified 11515 * events handler and thread. 11516 * 11517 * @param handler the events handler the view must use 11518 */ 11519 AttachInfo(IWindowSession session, IWindow window, 11520 Handler handler, Callbacks effectPlayer) { 11521 mSession = session; 11522 mWindow = window; 11523 mWindowToken = window.asBinder(); 11524 mHandler = handler; 11525 mRootCallbacks = effectPlayer; 11526 } 11527 } 11528 11529 /** 11530 * <p>ScrollabilityCache holds various fields used by a View when scrolling 11531 * is supported. This avoids keeping too many unused fields in most 11532 * instances of View.</p> 11533 */ 11534 private static class ScrollabilityCache implements Runnable { 11535 11536 /** 11537 * Scrollbars are not visible 11538 */ 11539 public static final int OFF = 0; 11540 11541 /** 11542 * Scrollbars are visible 11543 */ 11544 public static final int ON = 1; 11545 11546 /** 11547 * Scrollbars are fading away 11548 */ 11549 public static final int FADING = 2; 11550 11551 public boolean fadeScrollBars; 11552 11553 public int fadingEdgeLength; 11554 public int scrollBarDefaultDelayBeforeFade; 11555 public int scrollBarFadeDuration; 11556 11557 public int scrollBarSize; 11558 public ScrollBarDrawable scrollBar; 11559 public float[] interpolatorValues; 11560 public View host; 11561 11562 public final Paint paint; 11563 public final Matrix matrix; 11564 public Shader shader; 11565 11566 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 11567 11568 private static final float[] OPAQUE = { 255 }; 11569 private static final float[] TRANSPARENT = { 0.0f }; 11570 11571 /** 11572 * When fading should start. This time moves into the future every time 11573 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 11574 */ 11575 public long fadeStartTime; 11576 11577 11578 /** 11579 * The current state of the scrollbars: ON, OFF, or FADING 11580 */ 11581 public int state = OFF; 11582 11583 private int mLastColor; 11584 11585 public ScrollabilityCache(ViewConfiguration configuration, View host) { 11586 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 11587 scrollBarSize = configuration.getScaledScrollBarSize(); 11588 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 11589 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 11590 11591 paint = new Paint(); 11592 matrix = new Matrix(); 11593 // use use a height of 1, and then wack the matrix each time we 11594 // actually use it. 11595 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 11596 11597 paint.setShader(shader); 11598 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 11599 this.host = host; 11600 } 11601 11602 public void setFadeColor(int color) { 11603 if (color != 0 && color != mLastColor) { 11604 mLastColor = color; 11605 color |= 0xFF000000; 11606 11607 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 11608 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 11609 11610 paint.setShader(shader); 11611 // Restore the default transfer mode (src_over) 11612 paint.setXfermode(null); 11613 } 11614 } 11615 11616 public void run() { 11617 long now = AnimationUtils.currentAnimationTimeMillis(); 11618 if (now >= fadeStartTime) { 11619 11620 // the animation fades the scrollbars out by changing 11621 // the opacity (alpha) from fully opaque to fully 11622 // transparent 11623 int nextFrame = (int) now; 11624 int framesCount = 0; 11625 11626 Interpolator interpolator = scrollBarInterpolator; 11627 11628 // Start opaque 11629 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 11630 11631 // End transparent 11632 nextFrame += scrollBarFadeDuration; 11633 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 11634 11635 state = FADING; 11636 11637 // Kick off the fade animation 11638 host.invalidate(); 11639 } 11640 } 11641 11642 } 11643} 11644