View.java revision fb81703ab11c653a587b652b90ec3b550f500ccf
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.View.MeasureSpec; 62import android.view.accessibility.AccessibilityEvent; 63import android.view.accessibility.AccessibilityEventSource; 64import android.view.accessibility.AccessibilityManager; 65import android.view.animation.Animation; 66import android.view.animation.AnimationUtils; 67import android.view.inputmethod.EditorInfo; 68import android.view.inputmethod.InputConnection; 69import android.view.inputmethod.InputMethodManager; 70import android.widget.ScrollBarDrawable; 71 72import java.lang.ref.WeakReference; 73import java.lang.reflect.InvocationTargetException; 74import java.lang.reflect.Method; 75import java.util.ArrayList; 76import java.util.Arrays; 77import java.util.List; 78import java.util.WeakHashMap; 79 80/** 81 * <p> 82 * This class represents the basic building block for user interface components. A View 83 * occupies a rectangular area on the screen and is responsible for drawing and 84 * event handling. View is the base class for <em>widgets</em>, which are 85 * used to create interactive UI components (buttons, text fields, etc.). The 86 * {@link android.view.ViewGroup} subclass is the base class for <em>layouts</em>, which 87 * are invisible containers that hold other Views (or other ViewGroups) and define 88 * their layout properties. 89 * </p> 90 * 91 * <div class="special"> 92 * <p>For an introduction to using this class to develop your 93 * application's user interface, read the Developer Guide documentation on 94 * <strong><a href="{@docRoot}guide/topics/ui/index.html">User Interface</a></strong>. Special topics 95 * include: 96 * <br/><a href="{@docRoot}guide/topics/ui/declaring-layout.html">Declaring Layout</a> 97 * <br/><a href="{@docRoot}guide/topics/ui/menus.html">Creating Menus</a> 98 * <br/><a href="{@docRoot}guide/topics/ui/layout-objects.html">Common Layout Objects</a> 99 * <br/><a href="{@docRoot}guide/topics/ui/binding.html">Binding to Data with AdapterView</a> 100 * <br/><a href="{@docRoot}guide/topics/ui/ui-events.html">Handling UI Events</a> 101 * <br/><a href="{@docRoot}guide/topics/ui/themes.html">Applying Styles and Themes</a> 102 * <br/><a href="{@docRoot}guide/topics/ui/custom-components.html">Building Custom Components</a> 103 * <br/><a href="{@docRoot}guide/topics/ui/how-android-draws.html">How Android Draws Views</a>. 104 * </p> 105 * </div> 106 * 107 * <a name="Using"></a> 108 * <h3>Using Views</h3> 109 * <p> 110 * All of the views in a window are arranged in a single tree. You can add views 111 * either from code or by specifying a tree of views in one or more XML layout 112 * files. There are many specialized subclasses of views that act as controls or 113 * are capable of displaying text, images, or other content. 114 * </p> 115 * <p> 116 * Once you have created a tree of views, there are typically a few types of 117 * common operations you may wish to perform: 118 * <ul> 119 * <li><strong>Set properties:</strong> for example setting the text of a 120 * {@link android.widget.TextView}. The available properties and the methods 121 * that set them will vary among the different subclasses of views. Note that 122 * properties that are known at build time can be set in the XML layout 123 * files.</li> 124 * <li><strong>Set focus:</strong> The framework will handled moving focus in 125 * response to user input. To force focus to a specific view, call 126 * {@link #requestFocus}.</li> 127 * <li><strong>Set up listeners:</strong> Views allow clients to set listeners 128 * that will be notified when something interesting happens to the view. For 129 * example, all views will let you set a listener to be notified when the view 130 * gains or loses focus. You can register such a listener using 131 * {@link #setOnFocusChangeListener}. Other view subclasses offer more 132 * specialized listeners. For example, a Button exposes a listener to notify 133 * clients when the button is clicked.</li> 134 * <li><strong>Set visibility:</strong> You can hide or show views using 135 * {@link #setVisibility}.</li> 136 * </ul> 137 * </p> 138 * <p><em> 139 * Note: The Android framework is responsible for measuring, laying out and 140 * drawing views. You should not call methods that perform these actions on 141 * views yourself unless you are actually implementing a 142 * {@link android.view.ViewGroup}. 143 * </em></p> 144 * 145 * <a name="Lifecycle"></a> 146 * <h3>Implementing a Custom View</h3> 147 * 148 * <p> 149 * To implement a custom view, you will usually begin by providing overrides for 150 * some of the standard methods that the framework calls on all views. You do 151 * not need to override all of these methods. In fact, you can start by just 152 * overriding {@link #onDraw(android.graphics.Canvas)}. 153 * <table border="2" width="85%" align="center" cellpadding="5"> 154 * <thead> 155 * <tr><th>Category</th> <th>Methods</th> <th>Description</th></tr> 156 * </thead> 157 * 158 * <tbody> 159 * <tr> 160 * <td rowspan="2">Creation</td> 161 * <td>Constructors</td> 162 * <td>There is a form of the constructor that are called when the view 163 * is created from code and a form that is called when the view is 164 * inflated from a layout file. The second form should parse and apply 165 * any attributes defined in the layout file. 166 * </td> 167 * </tr> 168 * <tr> 169 * <td><code>{@link #onFinishInflate()}</code></td> 170 * <td>Called after a view and all of its children has been inflated 171 * from XML.</td> 172 * </tr> 173 * 174 * <tr> 175 * <td rowspan="3">Layout</td> 176 * <td><code>{@link #onMeasure}</code></td> 177 * <td>Called to determine the size requirements for this view and all 178 * of its children. 179 * </td> 180 * </tr> 181 * <tr> 182 * <td><code>{@link #onLayout}</code></td> 183 * <td>Called when this view should assign a size and position to all 184 * of its children. 185 * </td> 186 * </tr> 187 * <tr> 188 * <td><code>{@link #onSizeChanged}</code></td> 189 * <td>Called when the size of this view has changed. 190 * </td> 191 * </tr> 192 * 193 * <tr> 194 * <td>Drawing</td> 195 * <td><code>{@link #onDraw}</code></td> 196 * <td>Called when the view should render its content. 197 * </td> 198 * </tr> 199 * 200 * <tr> 201 * <td rowspan="4">Event processing</td> 202 * <td><code>{@link #onKeyDown}</code></td> 203 * <td>Called when a new key event occurs. 204 * </td> 205 * </tr> 206 * <tr> 207 * <td><code>{@link #onKeyUp}</code></td> 208 * <td>Called when a key up event occurs. 209 * </td> 210 * </tr> 211 * <tr> 212 * <td><code>{@link #onTrackballEvent}</code></td> 213 * <td>Called when a trackball motion event occurs. 214 * </td> 215 * </tr> 216 * <tr> 217 * <td><code>{@link #onTouchEvent}</code></td> 218 * <td>Called when a touch screen motion event occurs. 219 * </td> 220 * </tr> 221 * 222 * <tr> 223 * <td rowspan="2">Focus</td> 224 * <td><code>{@link #onFocusChanged}</code></td> 225 * <td>Called when the view gains or loses focus. 226 * </td> 227 * </tr> 228 * 229 * <tr> 230 * <td><code>{@link #onWindowFocusChanged}</code></td> 231 * <td>Called when the window containing the view gains or loses focus. 232 * </td> 233 * </tr> 234 * 235 * <tr> 236 * <td rowspan="3">Attaching</td> 237 * <td><code>{@link #onAttachedToWindow()}</code></td> 238 * <td>Called when the view is attached to a window. 239 * </td> 240 * </tr> 241 * 242 * <tr> 243 * <td><code>{@link #onDetachedFromWindow}</code></td> 244 * <td>Called when the view is detached from its window. 245 * </td> 246 * </tr> 247 * 248 * <tr> 249 * <td><code>{@link #onWindowVisibilityChanged}</code></td> 250 * <td>Called when the visibility of the window containing the view 251 * has changed. 252 * </td> 253 * </tr> 254 * </tbody> 255 * 256 * </table> 257 * </p> 258 * 259 * <a name="IDs"></a> 260 * <h3>IDs</h3> 261 * Views may have an integer id associated with them. These ids are typically 262 * assigned in the layout XML files, and are used to find specific views within 263 * the view tree. A common pattern is to: 264 * <ul> 265 * <li>Define a Button in the layout file and assign it a unique ID. 266 * <pre> 267 * <Button 268 * android:id="@+id/my_button" 269 * android:layout_width="wrap_content" 270 * android:layout_height="wrap_content" 271 * android:text="@string/my_button_text"/> 272 * </pre></li> 273 * <li>From the onCreate method of an Activity, find the Button 274 * <pre class="prettyprint"> 275 * Button myButton = (Button) findViewById(R.id.my_button); 276 * </pre></li> 277 * </ul> 278 * <p> 279 * View IDs need not be unique throughout the tree, but it is good practice to 280 * ensure that they are at least unique within the part of the tree you are 281 * searching. 282 * </p> 283 * 284 * <a name="Position"></a> 285 * <h3>Position</h3> 286 * <p> 287 * The geometry of a view is that of a rectangle. A view has a location, 288 * expressed as a pair of <em>left</em> and <em>top</em> coordinates, and 289 * two dimensions, expressed as a width and a height. The unit for location 290 * and dimensions is the pixel. 291 * </p> 292 * 293 * <p> 294 * It is possible to retrieve the location of a view by invoking the methods 295 * {@link #getLeft()} and {@link #getTop()}. The former returns the left, or X, 296 * coordinate of the rectangle representing the view. The latter returns the 297 * top, or Y, coordinate of the rectangle representing the view. These methods 298 * both return the location of the view relative to its parent. For instance, 299 * when getLeft() returns 20, that means the view is located 20 pixels to the 300 * right of the left edge of its direct parent. 301 * </p> 302 * 303 * <p> 304 * In addition, several convenience methods are offered to avoid unnecessary 305 * computations, namely {@link #getRight()} and {@link #getBottom()}. 306 * These methods return the coordinates of the right and bottom edges of the 307 * rectangle representing the view. For instance, calling {@link #getRight()} 308 * is similar to the following computation: <code>getLeft() + getWidth()</code> 309 * (see <a href="#SizePaddingMargins">Size</a> for more information about the width.) 310 * </p> 311 * 312 * <a name="SizePaddingMargins"></a> 313 * <h3>Size, padding and margins</h3> 314 * <p> 315 * The size of a view is expressed with a width and a height. A view actually 316 * possess two pairs of width and height values. 317 * </p> 318 * 319 * <p> 320 * The first pair is known as <em>measured width</em> and 321 * <em>measured height</em>. These dimensions define how big a view wants to be 322 * within its parent (see <a href="#Layout">Layout</a> for more details.) The 323 * measured dimensions can be obtained by calling {@link #getMeasuredWidth()} 324 * and {@link #getMeasuredHeight()}. 325 * </p> 326 * 327 * <p> 328 * The second pair is simply known as <em>width</em> and <em>height</em>, or 329 * sometimes <em>drawing width</em> and <em>drawing height</em>. These 330 * dimensions define the actual size of the view on screen, at drawing time and 331 * after layout. These values may, but do not have to, be different from the 332 * measured width and height. The width and height can be obtained by calling 333 * {@link #getWidth()} and {@link #getHeight()}. 334 * </p> 335 * 336 * <p> 337 * To measure its dimensions, a view takes into account its padding. The padding 338 * is expressed in pixels for the left, top, right and bottom parts of the view. 339 * Padding can be used to offset the content of the view by a specific amount of 340 * pixels. For instance, a left padding of 2 will push the view's content by 341 * 2 pixels to the right of the left edge. Padding can be set using the 342 * {@link #setPadding(int, int, int, int)} method and queried by calling 343 * {@link #getPaddingLeft()}, {@link #getPaddingTop()}, 344 * {@link #getPaddingRight()} and {@link #getPaddingBottom()}. 345 * </p> 346 * 347 * <p> 348 * Even though a view can define a padding, it does not provide any support for 349 * margins. However, view groups provide such a support. Refer to 350 * {@link android.view.ViewGroup} and 351 * {@link android.view.ViewGroup.MarginLayoutParams} for further information. 352 * </p> 353 * 354 * <a name="Layout"></a> 355 * <h3>Layout</h3> 356 * <p> 357 * Layout is a two pass process: a measure pass and a layout pass. The measuring 358 * pass is implemented in {@link #measure(int, int)} and is a top-down traversal 359 * of the view tree. Each view pushes dimension specifications down the tree 360 * during the recursion. At the end of the measure pass, every view has stored 361 * its measurements. The second pass happens in 362 * {@link #layout(int,int,int,int)} and is also top-down. During 363 * this pass each parent is responsible for positioning all of its children 364 * using the sizes computed in the measure pass. 365 * </p> 366 * 367 * <p> 368 * When a view's measure() method returns, its {@link #getMeasuredWidth()} and 369 * {@link #getMeasuredHeight()} values must be set, along with those for all of 370 * that view's descendants. A view's measured width and measured height values 371 * must respect the constraints imposed by the view's parents. This guarantees 372 * that at the end of the measure pass, all parents accept all of their 373 * children's measurements. A parent view may call measure() more than once on 374 * its children. For example, the parent may measure each child once with 375 * unspecified dimensions to find out how big they want to be, then call 376 * measure() on them again with actual numbers if the sum of all the children's 377 * unconstrained sizes is too big or too small. 378 * </p> 379 * 380 * <p> 381 * The measure pass uses two classes to communicate dimensions. The 382 * {@link MeasureSpec} class is used by views to tell their parents how they 383 * want to be measured and positioned. The base LayoutParams class just 384 * describes how big the view wants to be for both width and height. For each 385 * dimension, it can specify one of: 386 * <ul> 387 * <li> an exact number 388 * <li>MATCH_PARENT, which means the view wants to be as big as its parent 389 * (minus padding) 390 * <li> WRAP_CONTENT, which means that the view wants to be just big enough to 391 * enclose its content (plus padding). 392 * </ul> 393 * There are subclasses of LayoutParams for different subclasses of ViewGroup. 394 * For example, AbsoluteLayout has its own subclass of LayoutParams which adds 395 * an X and Y value. 396 * </p> 397 * 398 * <p> 399 * MeasureSpecs are used to push requirements down the tree from parent to 400 * child. A MeasureSpec can be in one of three modes: 401 * <ul> 402 * <li>UNSPECIFIED: This is used by a parent to determine the desired dimension 403 * of a child view. For example, a LinearLayout may call measure() on its child 404 * with the height set to UNSPECIFIED and a width of EXACTLY 240 to find out how 405 * tall the child view wants to be given a width of 240 pixels. 406 * <li>EXACTLY: This is used by the parent to impose an exact size on the 407 * child. The child must use this size, and guarantee that all of its 408 * descendants will fit within this size. 409 * <li>AT_MOST: This is used by the parent to impose a maximum size on the 410 * child. The child must gurantee that it and all of its descendants will fit 411 * within this size. 412 * </ul> 413 * </p> 414 * 415 * <p> 416 * To intiate a layout, call {@link #requestLayout}. This method is typically 417 * called by a view on itself when it believes that is can no longer fit within 418 * its current bounds. 419 * </p> 420 * 421 * <a name="Drawing"></a> 422 * <h3>Drawing</h3> 423 * <p> 424 * Drawing is handled by walking the tree and rendering each view that 425 * intersects the the invalid region. Because the tree is traversed in-order, 426 * this means that parents will draw before (i.e., behind) their children, with 427 * siblings drawn in the order they appear in the tree. 428 * If you set a background drawable for a View, then the View will draw it for you 429 * before calling back to its <code>onDraw()</code> method. 430 * </p> 431 * 432 * <p> 433 * Note that the framework will not draw views that are not in the invalid region. 434 * </p> 435 * 436 * <p> 437 * To force a view to draw, call {@link #invalidate()}. 438 * </p> 439 * 440 * <a name="EventHandlingThreading"></a> 441 * <h3>Event Handling and Threading</h3> 442 * <p> 443 * The basic cycle of a view is as follows: 444 * <ol> 445 * <li>An event comes in and is dispatched to the appropriate view. The view 446 * handles the event and notifies any listeners.</li> 447 * <li>If in the course of processing the event, the view's bounds may need 448 * to be changed, the view will call {@link #requestLayout()}.</li> 449 * <li>Similarly, if in the course of processing the event the view's appearance 450 * may need to be changed, the view will call {@link #invalidate()}.</li> 451 * <li>If either {@link #requestLayout()} or {@link #invalidate()} were called, 452 * the framework will take care of measuring, laying out, and drawing the tree 453 * as appropriate.</li> 454 * </ol> 455 * </p> 456 * 457 * <p><em>Note: The entire view tree is single threaded. You must always be on 458 * the UI thread when calling any method on any view.</em> 459 * If you are doing work on other threads and want to update the state of a view 460 * from that thread, you should use a {@link Handler}. 461 * </p> 462 * 463 * <a name="FocusHandling"></a> 464 * <h3>Focus Handling</h3> 465 * <p> 466 * The framework will handle routine focus movement in response to user input. 467 * This includes changing the focus as views are removed or hidden, or as new 468 * views become available. Views indicate their willingness to take focus 469 * through the {@link #isFocusable} method. To change whether a view can take 470 * focus, call {@link #setFocusable(boolean)}. When in touch mode (see notes below) 471 * views indicate whether they still would like focus via {@link #isFocusableInTouchMode} 472 * and can change this via {@link #setFocusableInTouchMode(boolean)}. 473 * </p> 474 * <p> 475 * Focus movement is based on an algorithm which finds the nearest neighbor in a 476 * given direction. In rare cases, the default algorithm may not match the 477 * intended behavior of the developer. In these situations, you can provide 478 * explicit overrides by using these XML attributes in the layout file: 479 * <pre> 480 * nextFocusDown 481 * nextFocusLeft 482 * nextFocusRight 483 * nextFocusUp 484 * </pre> 485 * </p> 486 * 487 * 488 * <p> 489 * To get a particular view to take focus, call {@link #requestFocus()}. 490 * </p> 491 * 492 * <a name="TouchMode"></a> 493 * <h3>Touch Mode</h3> 494 * <p> 495 * When a user is navigating a user interface via directional keys such as a D-pad, it is 496 * necessary to give focus to actionable items such as buttons so the user can see 497 * what will take input. If the device has touch capabilities, however, and the user 498 * begins interacting with the interface by touching it, it is no longer necessary to 499 * always highlight, or give focus to, a particular view. This motivates a mode 500 * for interaction named 'touch mode'. 501 * </p> 502 * <p> 503 * For a touch capable device, once the user touches the screen, the device 504 * will enter touch mode. From this point onward, only views for which 505 * {@link #isFocusableInTouchMode} is true will be focusable, such as text editing widgets. 506 * Other views that are touchable, like buttons, will not take focus when touched; they will 507 * only fire the on click listeners. 508 * </p> 509 * <p> 510 * Any time a user hits a directional key, such as a D-pad direction, the view device will 511 * exit touch mode, and find a view to take focus, so that the user may resume interacting 512 * with the user interface without touching the screen again. 513 * </p> 514 * <p> 515 * The touch mode state is maintained across {@link android.app.Activity}s. Call 516 * {@link #isInTouchMode} to see whether the device is currently in touch mode. 517 * </p> 518 * 519 * <a name="Scrolling"></a> 520 * <h3>Scrolling</h3> 521 * <p> 522 * The framework provides basic support for views that wish to internally 523 * scroll their content. This includes keeping track of the X and Y scroll 524 * offset as well as mechanisms for drawing scrollbars. See 525 * {@link #scrollBy(int, int)}, {@link #scrollTo(int, int)}, and 526 * {@link #awakenScrollBars()} for more details. 527 * </p> 528 * 529 * <a name="Tags"></a> 530 * <h3>Tags</h3> 531 * <p> 532 * Unlike IDs, tags are not used to identify views. Tags are essentially an 533 * extra piece of information that can be associated with a view. They are most 534 * often used as a convenience to store data related to views in the views 535 * themselves rather than by putting them in a separate structure. 536 * </p> 537 * 538 * <a name="Animation"></a> 539 * <h3>Animation</h3> 540 * <p> 541 * You can attach an {@link Animation} object to a view using 542 * {@link #setAnimation(Animation)} or 543 * {@link #startAnimation(Animation)}. The animation can alter the scale, 544 * rotation, translation and alpha of a view over time. If the animation is 545 * attached to a view that has children, the animation will affect the entire 546 * subtree rooted by that node. When an animation is started, the framework will 547 * take care of redrawing the appropriate views until the animation completes. 548 * </p> 549 * <p> 550 * Starting with Android 3.0, the preferred way of animating views is to use the 551 * {@link android.animation} package APIs. 552 * </p> 553 * 554 * <a name="Security"></a> 555 * <h3>Security</h3> 556 * <p> 557 * Sometimes it is essential that an application be able to verify that an action 558 * is being performed with the full knowledge and consent of the user, such as 559 * granting a permission request, making a purchase or clicking on an advertisement. 560 * Unfortunately, a malicious application could try to spoof the user into 561 * performing these actions, unaware, by concealing the intended purpose of the view. 562 * As a remedy, the framework offers a touch filtering mechanism that can be used to 563 * improve the security of views that provide access to sensitive functionality. 564 * </p><p> 565 * To enable touch filtering, call {@link #setFilterTouchesWhenObscured} or set the 566 * android:filterTouchesWhenObscured layout attribute to true. When enabled, the framework 567 * will discard touches that are received whenever the view's window is obscured by 568 * another visible window. As a result, the view will not receive touches whenever a 569 * toast, dialog or other window appears above the view's window. 570 * </p><p> 571 * For more fine-grained control over security, consider overriding the 572 * {@link #onFilterTouchEventForSecurity} method to implement your own security policy. 573 * See also {@link MotionEvent#FLAG_WINDOW_IS_OBSCURED}. 574 * </p> 575 * 576 * @attr ref android.R.styleable#View_alpha 577 * @attr ref android.R.styleable#View_background 578 * @attr ref android.R.styleable#View_clickable 579 * @attr ref android.R.styleable#View_contentDescription 580 * @attr ref android.R.styleable#View_drawingCacheQuality 581 * @attr ref android.R.styleable#View_duplicateParentState 582 * @attr ref android.R.styleable#View_id 583 * @attr ref android.R.styleable#View_fadingEdge 584 * @attr ref android.R.styleable#View_fadingEdgeLength 585 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 586 * @attr ref android.R.styleable#View_fitsSystemWindows 587 * @attr ref android.R.styleable#View_isScrollContainer 588 * @attr ref android.R.styleable#View_focusable 589 * @attr ref android.R.styleable#View_focusableInTouchMode 590 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 591 * @attr ref android.R.styleable#View_keepScreenOn 592 * @attr ref android.R.styleable#View_layerType 593 * @attr ref android.R.styleable#View_longClickable 594 * @attr ref android.R.styleable#View_minHeight 595 * @attr ref android.R.styleable#View_minWidth 596 * @attr ref android.R.styleable#View_nextFocusDown 597 * @attr ref android.R.styleable#View_nextFocusLeft 598 * @attr ref android.R.styleable#View_nextFocusRight 599 * @attr ref android.R.styleable#View_nextFocusUp 600 * @attr ref android.R.styleable#View_onClick 601 * @attr ref android.R.styleable#View_padding 602 * @attr ref android.R.styleable#View_paddingBottom 603 * @attr ref android.R.styleable#View_paddingLeft 604 * @attr ref android.R.styleable#View_paddingRight 605 * @attr ref android.R.styleable#View_paddingTop 606 * @attr ref android.R.styleable#View_saveEnabled 607 * @attr ref android.R.styleable#View_rotation 608 * @attr ref android.R.styleable#View_rotationX 609 * @attr ref android.R.styleable#View_rotationY 610 * @attr ref android.R.styleable#View_scaleX 611 * @attr ref android.R.styleable#View_scaleY 612 * @attr ref android.R.styleable#View_scrollX 613 * @attr ref android.R.styleable#View_scrollY 614 * @attr ref android.R.styleable#View_scrollbarSize 615 * @attr ref android.R.styleable#View_scrollbarStyle 616 * @attr ref android.R.styleable#View_scrollbars 617 * @attr ref android.R.styleable#View_scrollbarDefaultDelayBeforeFade 618 * @attr ref android.R.styleable#View_scrollbarFadeDuration 619 * @attr ref android.R.styleable#View_scrollbarTrackHorizontal 620 * @attr ref android.R.styleable#View_scrollbarThumbHorizontal 621 * @attr ref android.R.styleable#View_scrollbarThumbVertical 622 * @attr ref android.R.styleable#View_scrollbarTrackVertical 623 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawHorizontalTrack 624 * @attr ref android.R.styleable#View_scrollbarAlwaysDrawVerticalTrack 625 * @attr ref android.R.styleable#View_soundEffectsEnabled 626 * @attr ref android.R.styleable#View_tag 627 * @attr ref android.R.styleable#View_transformPivotX 628 * @attr ref android.R.styleable#View_transformPivotY 629 * @attr ref android.R.styleable#View_translationX 630 * @attr ref android.R.styleable#View_translationY 631 * @attr ref android.R.styleable#View_visibility 632 * 633 * @see android.view.ViewGroup 634 */ 635public class View implements Drawable.Callback, KeyEvent.Callback, AccessibilityEventSource { 636 private static final boolean DBG = false; 637 638 /** 639 * The logging tag used by this class with android.util.Log. 640 */ 641 protected static final String VIEW_LOG_TAG = "View"; 642 643 /** 644 * Used to mark a View that has no ID. 645 */ 646 public static final int NO_ID = -1; 647 648 /** 649 * This view does not want keystrokes. Use with TAKES_FOCUS_MASK when 650 * calling setFlags. 651 */ 652 private static final int NOT_FOCUSABLE = 0x00000000; 653 654 /** 655 * This view wants keystrokes. Use with TAKES_FOCUS_MASK when calling 656 * setFlags. 657 */ 658 private static final int FOCUSABLE = 0x00000001; 659 660 /** 661 * Mask for use with setFlags indicating bits used for focus. 662 */ 663 private static final int FOCUSABLE_MASK = 0x00000001; 664 665 /** 666 * This view will adjust its padding to fit sytem windows (e.g. status bar) 667 */ 668 private static final int FITS_SYSTEM_WINDOWS = 0x00000002; 669 670 /** 671 * This view is visible. Use with {@link #setVisibility}. 672 */ 673 public static final int VISIBLE = 0x00000000; 674 675 /** 676 * This view is invisible, but it still takes up space for layout purposes. 677 * Use with {@link #setVisibility}. 678 */ 679 public static final int INVISIBLE = 0x00000004; 680 681 /** 682 * This view is invisible, and it doesn't take any space for layout 683 * purposes. Use with {@link #setVisibility}. 684 */ 685 public static final int GONE = 0x00000008; 686 687 /** 688 * Mask for use with setFlags indicating bits used for visibility. 689 * {@hide} 690 */ 691 static final int VISIBILITY_MASK = 0x0000000C; 692 693 private static final int[] VISIBILITY_FLAGS = {VISIBLE, INVISIBLE, GONE}; 694 695 /** 696 * This view is enabled. Intrepretation varies by subclass. 697 * Use with ENABLED_MASK when calling setFlags. 698 * {@hide} 699 */ 700 static final int ENABLED = 0x00000000; 701 702 /** 703 * This view is disabled. Intrepretation varies by subclass. 704 * Use with ENABLED_MASK when calling setFlags. 705 * {@hide} 706 */ 707 static final int DISABLED = 0x00000020; 708 709 /** 710 * Mask for use with setFlags indicating bits used for indicating whether 711 * this view is enabled 712 * {@hide} 713 */ 714 static final int ENABLED_MASK = 0x00000020; 715 716 /** 717 * This view won't draw. {@link #onDraw} won't be called and further 718 * optimizations 719 * will be performed. It is okay to have this flag set and a background. 720 * Use with DRAW_MASK when calling setFlags. 721 * {@hide} 722 */ 723 static final int WILL_NOT_DRAW = 0x00000080; 724 725 /** 726 * Mask for use with setFlags indicating bits used for indicating whether 727 * this view is will draw 728 * {@hide} 729 */ 730 static final int DRAW_MASK = 0x00000080; 731 732 /** 733 * <p>This view doesn't show scrollbars.</p> 734 * {@hide} 735 */ 736 static final int SCROLLBARS_NONE = 0x00000000; 737 738 /** 739 * <p>This view shows horizontal scrollbars.</p> 740 * {@hide} 741 */ 742 static final int SCROLLBARS_HORIZONTAL = 0x00000100; 743 744 /** 745 * <p>This view shows vertical scrollbars.</p> 746 * {@hide} 747 */ 748 static final int SCROLLBARS_VERTICAL = 0x00000200; 749 750 /** 751 * <p>Mask for use with setFlags indicating bits used for indicating which 752 * scrollbars are enabled.</p> 753 * {@hide} 754 */ 755 static final int SCROLLBARS_MASK = 0x00000300; 756 757 /** 758 * Indicates that the view should filter touches when its window is obscured. 759 * Refer to the class comments for more information about this security feature. 760 * {@hide} 761 */ 762 static final int FILTER_TOUCHES_WHEN_OBSCURED = 0x00000400; 763 764 // note flag value 0x00000800 is now available for next flags... 765 766 /** 767 * <p>This view doesn't show fading edges.</p> 768 * {@hide} 769 */ 770 static final int FADING_EDGE_NONE = 0x00000000; 771 772 /** 773 * <p>This view shows horizontal fading edges.</p> 774 * {@hide} 775 */ 776 static final int FADING_EDGE_HORIZONTAL = 0x00001000; 777 778 /** 779 * <p>This view shows vertical fading edges.</p> 780 * {@hide} 781 */ 782 static final int FADING_EDGE_VERTICAL = 0x00002000; 783 784 /** 785 * <p>Mask for use with setFlags indicating bits used for indicating which 786 * fading edges are enabled.</p> 787 * {@hide} 788 */ 789 static final int FADING_EDGE_MASK = 0x00003000; 790 791 /** 792 * <p>Indicates this view can be clicked. When clickable, a View reacts 793 * to clicks by notifying the OnClickListener.<p> 794 * {@hide} 795 */ 796 static final int CLICKABLE = 0x00004000; 797 798 /** 799 * <p>Indicates this view is caching its drawing into a bitmap.</p> 800 * {@hide} 801 */ 802 static final int DRAWING_CACHE_ENABLED = 0x00008000; 803 804 /** 805 * <p>Indicates that no icicle should be saved for this view.<p> 806 * {@hide} 807 */ 808 static final int SAVE_DISABLED = 0x000010000; 809 810 /** 811 * <p>Mask for use with setFlags indicating bits used for the saveEnabled 812 * property.</p> 813 * {@hide} 814 */ 815 static final int SAVE_DISABLED_MASK = 0x000010000; 816 817 /** 818 * <p>Indicates that no drawing cache should ever be created for this view.<p> 819 * {@hide} 820 */ 821 static final int WILL_NOT_CACHE_DRAWING = 0x000020000; 822 823 /** 824 * <p>Indicates this view can take / keep focus when int touch mode.</p> 825 * {@hide} 826 */ 827 static final int FOCUSABLE_IN_TOUCH_MODE = 0x00040000; 828 829 /** 830 * <p>Enables low quality mode for the drawing cache.</p> 831 */ 832 public static final int DRAWING_CACHE_QUALITY_LOW = 0x00080000; 833 834 /** 835 * <p>Enables high quality mode for the drawing cache.</p> 836 */ 837 public static final int DRAWING_CACHE_QUALITY_HIGH = 0x00100000; 838 839 /** 840 * <p>Enables automatic quality mode for the drawing cache.</p> 841 */ 842 public static final int DRAWING_CACHE_QUALITY_AUTO = 0x00000000; 843 844 private static final int[] DRAWING_CACHE_QUALITY_FLAGS = { 845 DRAWING_CACHE_QUALITY_AUTO, DRAWING_CACHE_QUALITY_LOW, DRAWING_CACHE_QUALITY_HIGH 846 }; 847 848 /** 849 * <p>Mask for use with setFlags indicating bits used for the cache 850 * quality property.</p> 851 * {@hide} 852 */ 853 static final int DRAWING_CACHE_QUALITY_MASK = 0x00180000; 854 855 /** 856 * <p> 857 * Indicates this view can be long clicked. When long clickable, a View 858 * reacts to long clicks by notifying the OnLongClickListener or showing a 859 * context menu. 860 * </p> 861 * {@hide} 862 */ 863 static final int LONG_CLICKABLE = 0x00200000; 864 865 /** 866 * <p>Indicates that this view gets its drawable states from its direct parent 867 * and ignores its original internal states.</p> 868 * 869 * @hide 870 */ 871 static final int DUPLICATE_PARENT_STATE = 0x00400000; 872 873 /** 874 * The scrollbar style to display the scrollbars inside the content area, 875 * without increasing the padding. The scrollbars will be overlaid with 876 * translucency on the view's content. 877 */ 878 public static final int SCROLLBARS_INSIDE_OVERLAY = 0; 879 880 /** 881 * The scrollbar style to display the scrollbars inside the padded area, 882 * increasing the padding of the view. The scrollbars will not overlap the 883 * content area of the view. 884 */ 885 public static final int SCROLLBARS_INSIDE_INSET = 0x01000000; 886 887 /** 888 * The scrollbar style to display the scrollbars at the edge of the view, 889 * without increasing the padding. The scrollbars will be overlaid with 890 * translucency. 891 */ 892 public static final int SCROLLBARS_OUTSIDE_OVERLAY = 0x02000000; 893 894 /** 895 * The scrollbar style to display the scrollbars at the edge of the view, 896 * increasing the padding of the view. The scrollbars will only overlap the 897 * background, if any. 898 */ 899 public static final int SCROLLBARS_OUTSIDE_INSET = 0x03000000; 900 901 /** 902 * Mask to check if the scrollbar style is overlay or inset. 903 * {@hide} 904 */ 905 static final int SCROLLBARS_INSET_MASK = 0x01000000; 906 907 /** 908 * Mask to check if the scrollbar style is inside or outside. 909 * {@hide} 910 */ 911 static final int SCROLLBARS_OUTSIDE_MASK = 0x02000000; 912 913 /** 914 * Mask for scrollbar style. 915 * {@hide} 916 */ 917 static final int SCROLLBARS_STYLE_MASK = 0x03000000; 918 919 /** 920 * View flag indicating that the screen should remain on while the 921 * window containing this view is visible to the user. This effectively 922 * takes care of automatically setting the WindowManager's 923 * {@link WindowManager.LayoutParams#FLAG_KEEP_SCREEN_ON}. 924 */ 925 public static final int KEEP_SCREEN_ON = 0x04000000; 926 927 /** 928 * View flag indicating whether this view should have sound effects enabled 929 * for events such as clicking and touching. 930 */ 931 public static final int SOUND_EFFECTS_ENABLED = 0x08000000; 932 933 /** 934 * View flag indicating whether this view should have haptic feedback 935 * enabled for events such as long presses. 936 */ 937 public static final int HAPTIC_FEEDBACK_ENABLED = 0x10000000; 938 939 /** 940 * <p>Indicates that the view hierarchy should stop saving state when 941 * it reaches this view. If state saving is initiated immediately at 942 * the view, it will be allowed. 943 * {@hide} 944 */ 945 static final int PARENT_SAVE_DISABLED = 0x20000000; 946 947 /** 948 * <p>Mask for use with setFlags indicating bits used for PARENT_SAVE_DISABLED.</p> 949 * {@hide} 950 */ 951 static final int PARENT_SAVE_DISABLED_MASK = 0x20000000; 952 953 /** 954 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 955 * should add all focusable Views regardless if they are focusable in touch mode. 956 */ 957 public static final int FOCUSABLES_ALL = 0x00000000; 958 959 /** 960 * View flag indicating whether {@link #addFocusables(ArrayList, int, int)} 961 * should add only Views focusable in touch mode. 962 */ 963 public static final int FOCUSABLES_TOUCH_MODE = 0x00000001; 964 965 /** 966 * Use with {@link #focusSearch}. Move focus to the previous selectable 967 * item. 968 */ 969 public static final int FOCUS_BACKWARD = 0x00000001; 970 971 /** 972 * Use with {@link #focusSearch}. Move focus to the next selectable 973 * item. 974 */ 975 public static final int FOCUS_FORWARD = 0x00000002; 976 977 /** 978 * Use with {@link #focusSearch}. Move focus to the left. 979 */ 980 public static final int FOCUS_LEFT = 0x00000011; 981 982 /** 983 * Use with {@link #focusSearch}. Move focus up. 984 */ 985 public static final int FOCUS_UP = 0x00000021; 986 987 /** 988 * Use with {@link #focusSearch}. Move focus to the right. 989 */ 990 public static final int FOCUS_RIGHT = 0x00000042; 991 992 /** 993 * Use with {@link #focusSearch}. Move focus down. 994 */ 995 public static final int FOCUS_DOWN = 0x00000082; 996 997 /** 998 * Bits of {@link #getMeasuredWidthAndState()} and 999 * {@link #getMeasuredWidthAndState()} that provide the actual measured size. 1000 */ 1001 public static final int MEASURED_SIZE_MASK = 0x00ffffff; 1002 1003 /** 1004 * Bits of {@link #getMeasuredWidthAndState()} and 1005 * {@link #getMeasuredWidthAndState()} that provide the additional state bits. 1006 */ 1007 public static final int MEASURED_STATE_MASK = 0xff000000; 1008 1009 /** 1010 * Bit shift of {@link #MEASURED_STATE_MASK} to get to the height bits 1011 * for functions that combine both width and height into a single int, 1012 * such as {@link #getMeasuredState()} and the childState argument of 1013 * {@link #resolveSizeAndState(int, int, int)}. 1014 */ 1015 public static final int MEASURED_HEIGHT_STATE_SHIFT = 16; 1016 1017 /** 1018 * Bit of {@link #getMeasuredWidthAndState()} and 1019 * {@link #getMeasuredWidthAndState()} that indicates the measured size 1020 * is smaller that the space the view would like to have. 1021 */ 1022 public static final int MEASURED_STATE_TOO_SMALL = 0x01000000; 1023 1024 /** 1025 * Base View state sets 1026 */ 1027 // Singles 1028 /** 1029 * Indicates the view has no states set. States are used with 1030 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1031 * view depending on its state. 1032 * 1033 * @see android.graphics.drawable.Drawable 1034 * @see #getDrawableState() 1035 */ 1036 protected static final int[] EMPTY_STATE_SET; 1037 /** 1038 * Indicates the view is enabled. States are used with 1039 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1040 * view depending on its state. 1041 * 1042 * @see android.graphics.drawable.Drawable 1043 * @see #getDrawableState() 1044 */ 1045 protected static final int[] ENABLED_STATE_SET; 1046 /** 1047 * Indicates the view is focused. States are used with 1048 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1049 * view depending on its state. 1050 * 1051 * @see android.graphics.drawable.Drawable 1052 * @see #getDrawableState() 1053 */ 1054 protected static final int[] FOCUSED_STATE_SET; 1055 /** 1056 * Indicates the view is selected. States are used with 1057 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1058 * view depending on its state. 1059 * 1060 * @see android.graphics.drawable.Drawable 1061 * @see #getDrawableState() 1062 */ 1063 protected static final int[] SELECTED_STATE_SET; 1064 /** 1065 * Indicates the view is pressed. States are used with 1066 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1067 * view depending on its state. 1068 * 1069 * @see android.graphics.drawable.Drawable 1070 * @see #getDrawableState() 1071 * @hide 1072 */ 1073 protected static final int[] PRESSED_STATE_SET; 1074 /** 1075 * Indicates the view's window has focus. States are used with 1076 * {@link android.graphics.drawable.Drawable} to change the drawing of the 1077 * view depending on its state. 1078 * 1079 * @see android.graphics.drawable.Drawable 1080 * @see #getDrawableState() 1081 */ 1082 protected static final int[] WINDOW_FOCUSED_STATE_SET; 1083 // Doubles 1084 /** 1085 * Indicates the view is enabled and has the focus. 1086 * 1087 * @see #ENABLED_STATE_SET 1088 * @see #FOCUSED_STATE_SET 1089 */ 1090 protected static final int[] ENABLED_FOCUSED_STATE_SET; 1091 /** 1092 * Indicates the view is enabled and selected. 1093 * 1094 * @see #ENABLED_STATE_SET 1095 * @see #SELECTED_STATE_SET 1096 */ 1097 protected static final int[] ENABLED_SELECTED_STATE_SET; 1098 /** 1099 * Indicates the view is enabled and that its window has focus. 1100 * 1101 * @see #ENABLED_STATE_SET 1102 * @see #WINDOW_FOCUSED_STATE_SET 1103 */ 1104 protected static final int[] ENABLED_WINDOW_FOCUSED_STATE_SET; 1105 /** 1106 * Indicates the view is focused and selected. 1107 * 1108 * @see #FOCUSED_STATE_SET 1109 * @see #SELECTED_STATE_SET 1110 */ 1111 protected static final int[] FOCUSED_SELECTED_STATE_SET; 1112 /** 1113 * Indicates the view has the focus and that its window has the focus. 1114 * 1115 * @see #FOCUSED_STATE_SET 1116 * @see #WINDOW_FOCUSED_STATE_SET 1117 */ 1118 protected static final int[] FOCUSED_WINDOW_FOCUSED_STATE_SET; 1119 /** 1120 * Indicates the view is selected and that its window has the focus. 1121 * 1122 * @see #SELECTED_STATE_SET 1123 * @see #WINDOW_FOCUSED_STATE_SET 1124 */ 1125 protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET; 1126 // Triples 1127 /** 1128 * Indicates the view is enabled, focused and selected. 1129 * 1130 * @see #ENABLED_STATE_SET 1131 * @see #FOCUSED_STATE_SET 1132 * @see #SELECTED_STATE_SET 1133 */ 1134 protected static final int[] ENABLED_FOCUSED_SELECTED_STATE_SET; 1135 /** 1136 * Indicates the view is enabled, focused and its window has the focus. 1137 * 1138 * @see #ENABLED_STATE_SET 1139 * @see #FOCUSED_STATE_SET 1140 * @see #WINDOW_FOCUSED_STATE_SET 1141 */ 1142 protected static final int[] ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1143 /** 1144 * Indicates the view is enabled, selected and its window has the focus. 1145 * 1146 * @see #ENABLED_STATE_SET 1147 * @see #SELECTED_STATE_SET 1148 * @see #WINDOW_FOCUSED_STATE_SET 1149 */ 1150 protected static final int[] ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1151 /** 1152 * Indicates the view is focused, selected and its window has the focus. 1153 * 1154 * @see #FOCUSED_STATE_SET 1155 * @see #SELECTED_STATE_SET 1156 * @see #WINDOW_FOCUSED_STATE_SET 1157 */ 1158 protected static final int[] FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1159 /** 1160 * Indicates the view is enabled, focused, selected and its window 1161 * has the focus. 1162 * 1163 * @see #ENABLED_STATE_SET 1164 * @see #FOCUSED_STATE_SET 1165 * @see #SELECTED_STATE_SET 1166 * @see #WINDOW_FOCUSED_STATE_SET 1167 */ 1168 protected static final int[] ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1169 /** 1170 * Indicates the view is pressed and its window has the focus. 1171 * 1172 * @see #PRESSED_STATE_SET 1173 * @see #WINDOW_FOCUSED_STATE_SET 1174 */ 1175 protected static final int[] PRESSED_WINDOW_FOCUSED_STATE_SET; 1176 /** 1177 * Indicates the view is pressed and selected. 1178 * 1179 * @see #PRESSED_STATE_SET 1180 * @see #SELECTED_STATE_SET 1181 */ 1182 protected static final int[] PRESSED_SELECTED_STATE_SET; 1183 /** 1184 * Indicates the view is pressed, selected and its window has the focus. 1185 * 1186 * @see #PRESSED_STATE_SET 1187 * @see #SELECTED_STATE_SET 1188 * @see #WINDOW_FOCUSED_STATE_SET 1189 */ 1190 protected static final int[] PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1191 /** 1192 * Indicates the view is pressed and focused. 1193 * 1194 * @see #PRESSED_STATE_SET 1195 * @see #FOCUSED_STATE_SET 1196 */ 1197 protected static final int[] PRESSED_FOCUSED_STATE_SET; 1198 /** 1199 * Indicates the view is pressed, focused and its window has the focus. 1200 * 1201 * @see #PRESSED_STATE_SET 1202 * @see #FOCUSED_STATE_SET 1203 * @see #WINDOW_FOCUSED_STATE_SET 1204 */ 1205 protected static final int[] PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1206 /** 1207 * Indicates the view is pressed, focused and selected. 1208 * 1209 * @see #PRESSED_STATE_SET 1210 * @see #SELECTED_STATE_SET 1211 * @see #FOCUSED_STATE_SET 1212 */ 1213 protected static final int[] PRESSED_FOCUSED_SELECTED_STATE_SET; 1214 /** 1215 * Indicates the view is pressed, focused, selected and its window has the focus. 1216 * 1217 * @see #PRESSED_STATE_SET 1218 * @see #FOCUSED_STATE_SET 1219 * @see #SELECTED_STATE_SET 1220 * @see #WINDOW_FOCUSED_STATE_SET 1221 */ 1222 protected static final int[] PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1223 /** 1224 * Indicates the view is pressed and enabled. 1225 * 1226 * @see #PRESSED_STATE_SET 1227 * @see #ENABLED_STATE_SET 1228 */ 1229 protected static final int[] PRESSED_ENABLED_STATE_SET; 1230 /** 1231 * Indicates the view is pressed, enabled and its window has the focus. 1232 * 1233 * @see #PRESSED_STATE_SET 1234 * @see #ENABLED_STATE_SET 1235 * @see #WINDOW_FOCUSED_STATE_SET 1236 */ 1237 protected static final int[] PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET; 1238 /** 1239 * Indicates the view is pressed, enabled and selected. 1240 * 1241 * @see #PRESSED_STATE_SET 1242 * @see #ENABLED_STATE_SET 1243 * @see #SELECTED_STATE_SET 1244 */ 1245 protected static final int[] PRESSED_ENABLED_SELECTED_STATE_SET; 1246 /** 1247 * Indicates the view is pressed, enabled, selected and its window has the 1248 * focus. 1249 * 1250 * @see #PRESSED_STATE_SET 1251 * @see #ENABLED_STATE_SET 1252 * @see #SELECTED_STATE_SET 1253 * @see #WINDOW_FOCUSED_STATE_SET 1254 */ 1255 protected static final int[] PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1256 /** 1257 * Indicates the view is pressed, enabled and focused. 1258 * 1259 * @see #PRESSED_STATE_SET 1260 * @see #ENABLED_STATE_SET 1261 * @see #FOCUSED_STATE_SET 1262 */ 1263 protected static final int[] PRESSED_ENABLED_FOCUSED_STATE_SET; 1264 /** 1265 * Indicates the view is pressed, enabled, focused and its window has the 1266 * focus. 1267 * 1268 * @see #PRESSED_STATE_SET 1269 * @see #ENABLED_STATE_SET 1270 * @see #FOCUSED_STATE_SET 1271 * @see #WINDOW_FOCUSED_STATE_SET 1272 */ 1273 protected static final int[] PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET; 1274 /** 1275 * Indicates the view is pressed, enabled, focused and selected. 1276 * 1277 * @see #PRESSED_STATE_SET 1278 * @see #ENABLED_STATE_SET 1279 * @see #SELECTED_STATE_SET 1280 * @see #FOCUSED_STATE_SET 1281 */ 1282 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET; 1283 /** 1284 * Indicates the view is pressed, enabled, focused, selected and its window 1285 * has the focus. 1286 * 1287 * @see #PRESSED_STATE_SET 1288 * @see #ENABLED_STATE_SET 1289 * @see #SELECTED_STATE_SET 1290 * @see #FOCUSED_STATE_SET 1291 * @see #WINDOW_FOCUSED_STATE_SET 1292 */ 1293 protected static final int[] PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET; 1294 1295 /** 1296 * The order here is very important to {@link #getDrawableState()} 1297 */ 1298 private static final int[][] VIEW_STATE_SETS; 1299 1300 static final int VIEW_STATE_WINDOW_FOCUSED = 1; 1301 static final int VIEW_STATE_SELECTED = 1 << 1; 1302 static final int VIEW_STATE_FOCUSED = 1 << 2; 1303 static final int VIEW_STATE_ENABLED = 1 << 3; 1304 static final int VIEW_STATE_PRESSED = 1 << 4; 1305 static final int VIEW_STATE_ACTIVATED = 1 << 5; 1306 static final int VIEW_STATE_ACCELERATED = 1 << 6; 1307 1308 static final int[] VIEW_STATE_IDS = new int[] { 1309 R.attr.state_window_focused, VIEW_STATE_WINDOW_FOCUSED, 1310 R.attr.state_selected, VIEW_STATE_SELECTED, 1311 R.attr.state_focused, VIEW_STATE_FOCUSED, 1312 R.attr.state_enabled, VIEW_STATE_ENABLED, 1313 R.attr.state_pressed, VIEW_STATE_PRESSED, 1314 R.attr.state_activated, VIEW_STATE_ACTIVATED, 1315 R.attr.state_accelerated, VIEW_STATE_ACCELERATED, 1316 }; 1317 1318 static { 1319 if ((VIEW_STATE_IDS.length/2) != R.styleable.ViewDrawableStates.length) { 1320 throw new IllegalStateException( 1321 "VIEW_STATE_IDs array length does not match ViewDrawableStates style array"); 1322 } 1323 int[] orderedIds = new int[VIEW_STATE_IDS.length]; 1324 for (int i = 0; i < R.styleable.ViewDrawableStates.length; i++) { 1325 int viewState = R.styleable.ViewDrawableStates[i]; 1326 for (int j = 0; j<VIEW_STATE_IDS.length; j += 2) { 1327 if (VIEW_STATE_IDS[j] == viewState) { 1328 orderedIds[i * 2] = viewState; 1329 orderedIds[i * 2 + 1] = VIEW_STATE_IDS[j + 1]; 1330 } 1331 } 1332 } 1333 final int NUM_BITS = VIEW_STATE_IDS.length / 2; 1334 VIEW_STATE_SETS = new int[1 << NUM_BITS][]; 1335 for (int i = 0; i < VIEW_STATE_SETS.length; i++) { 1336 int numBits = Integer.bitCount(i); 1337 int[] set = new int[numBits]; 1338 int pos = 0; 1339 for (int j = 0; j < orderedIds.length; j += 2) { 1340 if ((i & orderedIds[j+1]) != 0) { 1341 set[pos++] = orderedIds[j]; 1342 } 1343 } 1344 VIEW_STATE_SETS[i] = set; 1345 } 1346 1347 EMPTY_STATE_SET = VIEW_STATE_SETS[0]; 1348 WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_WINDOW_FOCUSED]; 1349 SELECTED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_SELECTED]; 1350 SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1351 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED]; 1352 FOCUSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_FOCUSED]; 1353 FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1354 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED]; 1355 FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1356 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED]; 1357 FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1358 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1359 | VIEW_STATE_FOCUSED]; 1360 ENABLED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_ENABLED]; 1361 ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1362 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED]; 1363 ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1364 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED]; 1365 ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1366 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1367 | VIEW_STATE_ENABLED]; 1368 ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1369 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED]; 1370 ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1371 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1372 | VIEW_STATE_ENABLED]; 1373 ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1374 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1375 | VIEW_STATE_ENABLED]; 1376 ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1377 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1378 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED]; 1379 1380 PRESSED_STATE_SET = VIEW_STATE_SETS[VIEW_STATE_PRESSED]; 1381 PRESSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1382 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_PRESSED]; 1383 PRESSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1384 VIEW_STATE_SELECTED | VIEW_STATE_PRESSED]; 1385 PRESSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1386 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1387 | VIEW_STATE_PRESSED]; 1388 PRESSED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1389 VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1390 PRESSED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1391 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1392 | VIEW_STATE_PRESSED]; 1393 PRESSED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1394 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1395 | VIEW_STATE_PRESSED]; 1396 PRESSED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1397 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1398 | VIEW_STATE_FOCUSED | VIEW_STATE_PRESSED]; 1399 PRESSED_ENABLED_STATE_SET = VIEW_STATE_SETS[ 1400 VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1401 PRESSED_ENABLED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1402 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_ENABLED 1403 | VIEW_STATE_PRESSED]; 1404 PRESSED_ENABLED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1405 VIEW_STATE_SELECTED | VIEW_STATE_ENABLED 1406 | VIEW_STATE_PRESSED]; 1407 PRESSED_ENABLED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1408 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1409 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1410 PRESSED_ENABLED_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1411 VIEW_STATE_FOCUSED | VIEW_STATE_ENABLED 1412 | VIEW_STATE_PRESSED]; 1413 PRESSED_ENABLED_FOCUSED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1414 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_FOCUSED 1415 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1416 PRESSED_ENABLED_FOCUSED_SELECTED_STATE_SET = VIEW_STATE_SETS[ 1417 VIEW_STATE_SELECTED | VIEW_STATE_FOCUSED 1418 | VIEW_STATE_ENABLED | VIEW_STATE_PRESSED]; 1419 PRESSED_ENABLED_FOCUSED_SELECTED_WINDOW_FOCUSED_STATE_SET = VIEW_STATE_SETS[ 1420 VIEW_STATE_WINDOW_FOCUSED | VIEW_STATE_SELECTED 1421 | VIEW_STATE_FOCUSED| VIEW_STATE_ENABLED 1422 | VIEW_STATE_PRESSED]; 1423 } 1424 1425 /** 1426 * Used by views that contain lists of items. This state indicates that 1427 * the view is showing the last item. 1428 * @hide 1429 */ 1430 protected static final int[] LAST_STATE_SET = {R.attr.state_last}; 1431 /** 1432 * Used by views that contain lists of items. This state indicates that 1433 * the view is showing the first item. 1434 * @hide 1435 */ 1436 protected static final int[] FIRST_STATE_SET = {R.attr.state_first}; 1437 /** 1438 * Used by views that contain lists of items. This state indicates that 1439 * the view is showing the middle item. 1440 * @hide 1441 */ 1442 protected static final int[] MIDDLE_STATE_SET = {R.attr.state_middle}; 1443 /** 1444 * Used by views that contain lists of items. This state indicates that 1445 * the view is showing only one item. 1446 * @hide 1447 */ 1448 protected static final int[] SINGLE_STATE_SET = {R.attr.state_single}; 1449 /** 1450 * Used by views that contain lists of items. This state indicates that 1451 * the view is pressed and showing the last item. 1452 * @hide 1453 */ 1454 protected static final int[] PRESSED_LAST_STATE_SET = {R.attr.state_last, R.attr.state_pressed}; 1455 /** 1456 * Used by views that contain lists of items. This state indicates that 1457 * the view is pressed and showing the first item. 1458 * @hide 1459 */ 1460 protected static final int[] PRESSED_FIRST_STATE_SET = {R.attr.state_first, R.attr.state_pressed}; 1461 /** 1462 * Used by views that contain lists of items. This state indicates that 1463 * the view is pressed and showing the middle item. 1464 * @hide 1465 */ 1466 protected static final int[] PRESSED_MIDDLE_STATE_SET = {R.attr.state_middle, R.attr.state_pressed}; 1467 /** 1468 * Used by views that contain lists of items. This state indicates that 1469 * the view is pressed and showing only one item. 1470 * @hide 1471 */ 1472 protected static final int[] PRESSED_SINGLE_STATE_SET = {R.attr.state_single, R.attr.state_pressed}; 1473 1474 /** 1475 * Temporary Rect currently for use in setBackground(). This will probably 1476 * be extended in the future to hold our own class with more than just 1477 * a Rect. :) 1478 */ 1479 static final ThreadLocal<Rect> sThreadLocal = new ThreadLocal<Rect>(); 1480 1481 /** 1482 * Map used to store views' tags. 1483 */ 1484 private static WeakHashMap<View, SparseArray<Object>> sTags; 1485 1486 /** 1487 * Lock used to access sTags. 1488 */ 1489 private static final Object sTagsLock = new Object(); 1490 1491 /** 1492 * The animation currently associated with this view. 1493 * @hide 1494 */ 1495 protected Animation mCurrentAnimation = null; 1496 1497 /** 1498 * Width as measured during measure pass. 1499 * {@hide} 1500 */ 1501 @ViewDebug.ExportedProperty(category = "measurement") 1502 /*package*/ int mMeasuredWidth; 1503 1504 /** 1505 * Height as measured during measure pass. 1506 * {@hide} 1507 */ 1508 @ViewDebug.ExportedProperty(category = "measurement") 1509 /*package*/ int mMeasuredHeight; 1510 1511 /** 1512 * The view's identifier. 1513 * {@hide} 1514 * 1515 * @see #setId(int) 1516 * @see #getId() 1517 */ 1518 @ViewDebug.ExportedProperty(resolveId = true) 1519 int mID = NO_ID; 1520 1521 /** 1522 * The view's tag. 1523 * {@hide} 1524 * 1525 * @see #setTag(Object) 1526 * @see #getTag() 1527 */ 1528 protected Object mTag; 1529 1530 // for mPrivateFlags: 1531 /** {@hide} */ 1532 static final int WANTS_FOCUS = 0x00000001; 1533 /** {@hide} */ 1534 static final int FOCUSED = 0x00000002; 1535 /** {@hide} */ 1536 static final int SELECTED = 0x00000004; 1537 /** {@hide} */ 1538 static final int IS_ROOT_NAMESPACE = 0x00000008; 1539 /** {@hide} */ 1540 static final int HAS_BOUNDS = 0x00000010; 1541 /** {@hide} */ 1542 static final int DRAWN = 0x00000020; 1543 /** 1544 * When this flag is set, this view is running an animation on behalf of its 1545 * children and should therefore not cancel invalidate requests, even if they 1546 * lie outside of this view's bounds. 1547 * 1548 * {@hide} 1549 */ 1550 static final int DRAW_ANIMATION = 0x00000040; 1551 /** {@hide} */ 1552 static final int SKIP_DRAW = 0x00000080; 1553 /** {@hide} */ 1554 static final int ONLY_DRAWS_BACKGROUND = 0x00000100; 1555 /** {@hide} */ 1556 static final int REQUEST_TRANSPARENT_REGIONS = 0x00000200; 1557 /** {@hide} */ 1558 static final int DRAWABLE_STATE_DIRTY = 0x00000400; 1559 /** {@hide} */ 1560 static final int MEASURED_DIMENSION_SET = 0x00000800; 1561 /** {@hide} */ 1562 static final int FORCE_LAYOUT = 0x00001000; 1563 /** {@hide} */ 1564 static final int LAYOUT_REQUIRED = 0x00002000; 1565 1566 private static final int PRESSED = 0x00004000; 1567 1568 /** {@hide} */ 1569 static final int DRAWING_CACHE_VALID = 0x00008000; 1570 /** 1571 * Flag used to indicate that this view should be drawn once more (and only once 1572 * more) after its animation has completed. 1573 * {@hide} 1574 */ 1575 static final int ANIMATION_STARTED = 0x00010000; 1576 1577 private static final int SAVE_STATE_CALLED = 0x00020000; 1578 1579 /** 1580 * Indicates that the View returned true when onSetAlpha() was called and that 1581 * the alpha must be restored. 1582 * {@hide} 1583 */ 1584 static final int ALPHA_SET = 0x00040000; 1585 1586 /** 1587 * Set by {@link #setScrollContainer(boolean)}. 1588 */ 1589 static final int SCROLL_CONTAINER = 0x00080000; 1590 1591 /** 1592 * Set by {@link #setScrollContainer(boolean)}. 1593 */ 1594 static final int SCROLL_CONTAINER_ADDED = 0x00100000; 1595 1596 /** 1597 * View flag indicating whether this view was invalidated (fully or partially.) 1598 * 1599 * @hide 1600 */ 1601 static final int DIRTY = 0x00200000; 1602 1603 /** 1604 * View flag indicating whether this view was invalidated by an opaque 1605 * invalidate request. 1606 * 1607 * @hide 1608 */ 1609 static final int DIRTY_OPAQUE = 0x00400000; 1610 1611 /** 1612 * Mask for {@link #DIRTY} and {@link #DIRTY_OPAQUE}. 1613 * 1614 * @hide 1615 */ 1616 static final int DIRTY_MASK = 0x00600000; 1617 1618 /** 1619 * Indicates whether the background is opaque. 1620 * 1621 * @hide 1622 */ 1623 static final int OPAQUE_BACKGROUND = 0x00800000; 1624 1625 /** 1626 * Indicates whether the scrollbars are opaque. 1627 * 1628 * @hide 1629 */ 1630 static final int OPAQUE_SCROLLBARS = 0x01000000; 1631 1632 /** 1633 * Indicates whether the view is opaque. 1634 * 1635 * @hide 1636 */ 1637 static final int OPAQUE_MASK = 0x01800000; 1638 1639 /** 1640 * Indicates a prepressed state; 1641 * the short time between ACTION_DOWN and recognizing 1642 * a 'real' press. Prepressed is used to recognize quick taps 1643 * even when they are shorter than ViewConfiguration.getTapTimeout(). 1644 * 1645 * @hide 1646 */ 1647 private static final int PREPRESSED = 0x02000000; 1648 1649 /** 1650 * Indicates whether the view is temporarily detached. 1651 * 1652 * @hide 1653 */ 1654 static final int CANCEL_NEXT_UP_EVENT = 0x04000000; 1655 1656 /** 1657 * Indicates that we should awaken scroll bars once attached 1658 * 1659 * @hide 1660 */ 1661 private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000; 1662 1663 /** 1664 * Indicates that pivotX or pivotY were explicitly set and we should not assume the center 1665 * for transform operations 1666 * 1667 * @hide 1668 */ 1669 private static final int PIVOT_EXPLICITLY_SET = 0x20000000; 1670 1671 /** {@hide} */ 1672 static final int ACTIVATED = 0x40000000; 1673 1674 /** 1675 * Always allow a user to over-scroll this view, provided it is a 1676 * view that can scroll. 1677 * 1678 * @see #getOverScrollMode() 1679 * @see #setOverScrollMode(int) 1680 */ 1681 public static final int OVER_SCROLL_ALWAYS = 0; 1682 1683 /** 1684 * Allow a user to over-scroll this view only if the content is large 1685 * enough to meaningfully scroll, provided it is a view that can scroll. 1686 * 1687 * @see #getOverScrollMode() 1688 * @see #setOverScrollMode(int) 1689 */ 1690 public static final int OVER_SCROLL_IF_CONTENT_SCROLLS = 1; 1691 1692 /** 1693 * Never allow a user to over-scroll this view. 1694 * 1695 * @see #getOverScrollMode() 1696 * @see #setOverScrollMode(int) 1697 */ 1698 public static final int OVER_SCROLL_NEVER = 2; 1699 1700 /** 1701 * Controls the over-scroll mode for this view. 1702 * See {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)}, 1703 * {@link #OVER_SCROLL_ALWAYS}, {@link #OVER_SCROLL_IF_CONTENT_SCROLLS}, 1704 * and {@link #OVER_SCROLL_NEVER}. 1705 */ 1706 private int mOverScrollMode; 1707 1708 /** 1709 * The parent this view is attached to. 1710 * {@hide} 1711 * 1712 * @see #getParent() 1713 */ 1714 protected ViewParent mParent; 1715 1716 /** 1717 * {@hide} 1718 */ 1719 AttachInfo mAttachInfo; 1720 1721 /** 1722 * {@hide} 1723 */ 1724 @ViewDebug.ExportedProperty(flagMapping = { 1725 @ViewDebug.FlagToString(mask = FORCE_LAYOUT, equals = FORCE_LAYOUT, 1726 name = "FORCE_LAYOUT"), 1727 @ViewDebug.FlagToString(mask = LAYOUT_REQUIRED, equals = LAYOUT_REQUIRED, 1728 name = "LAYOUT_REQUIRED"), 1729 @ViewDebug.FlagToString(mask = DRAWING_CACHE_VALID, equals = DRAWING_CACHE_VALID, 1730 name = "DRAWING_CACHE_INVALID", outputIf = false), 1731 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "DRAWN", outputIf = true), 1732 @ViewDebug.FlagToString(mask = DRAWN, equals = DRAWN, name = "NOT_DRAWN", outputIf = false), 1733 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY_OPAQUE, name = "DIRTY_OPAQUE"), 1734 @ViewDebug.FlagToString(mask = DIRTY_MASK, equals = DIRTY, name = "DIRTY") 1735 }) 1736 int mPrivateFlags; 1737 1738 /** 1739 * Count of how many windows this view has been attached to. 1740 */ 1741 int mWindowAttachCount; 1742 1743 /** 1744 * The layout parameters associated with this view and used by the parent 1745 * {@link android.view.ViewGroup} to determine how this view should be 1746 * laid out. 1747 * {@hide} 1748 */ 1749 protected ViewGroup.LayoutParams mLayoutParams; 1750 1751 /** 1752 * The view flags hold various views states. 1753 * {@hide} 1754 */ 1755 @ViewDebug.ExportedProperty 1756 int mViewFlags; 1757 1758 /** 1759 * The transform matrix for the View. This transform is calculated internally 1760 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1761 * is used by default. Do *not* use this variable directly; instead call 1762 * getMatrix(), which will automatically recalculate the matrix if necessary 1763 * to get the correct matrix based on the latest rotation and scale properties. 1764 */ 1765 private final Matrix mMatrix = new Matrix(); 1766 1767 /** 1768 * The transform matrix for the View. This transform is calculated internally 1769 * based on the rotation, scaleX, and scaleY properties. The identity matrix 1770 * is used by default. Do *not* use this variable directly; instead call 1771 * getInverseMatrix(), which will automatically recalculate the matrix if necessary 1772 * to get the correct matrix based on the latest rotation and scale properties. 1773 */ 1774 private Matrix mInverseMatrix; 1775 1776 /** 1777 * An internal variable that tracks whether we need to recalculate the 1778 * transform matrix, based on whether the rotation or scaleX/Y properties 1779 * have changed since the matrix was last calculated. 1780 */ 1781 private boolean mMatrixDirty = false; 1782 1783 /** 1784 * An internal variable that tracks whether we need to recalculate the 1785 * transform matrix, based on whether the rotation or scaleX/Y properties 1786 * have changed since the matrix was last calculated. 1787 */ 1788 private boolean mInverseMatrixDirty = true; 1789 1790 /** 1791 * A variable that tracks whether we need to recalculate the 1792 * transform matrix, based on whether the rotation or scaleX/Y properties 1793 * have changed since the matrix was last calculated. This variable 1794 * is only valid after a call to updateMatrix() or to a function that 1795 * calls it such as getMatrix(), hasIdentityMatrix() and getInverseMatrix(). 1796 */ 1797 private boolean mMatrixIsIdentity = true; 1798 1799 /** 1800 * The Camera object is used to compute a 3D matrix when rotationX or rotationY are set. 1801 */ 1802 private Camera mCamera = null; 1803 1804 /** 1805 * This matrix is used when computing the matrix for 3D rotations. 1806 */ 1807 private Matrix matrix3D = null; 1808 1809 /** 1810 * These prev values are used to recalculate a centered pivot point when necessary. The 1811 * pivot point is only used in matrix operations (when rotation, scale, or translation are 1812 * set), so thes values are only used then as well. 1813 */ 1814 private int mPrevWidth = -1; 1815 private int mPrevHeight = -1; 1816 1817 /** 1818 * Convenience value to check for float values that are close enough to zero to be considered 1819 * zero. 1820 */ 1821 private static final float NONZERO_EPSILON = .001f; 1822 1823 /** 1824 * The degrees rotation around the vertical axis through the pivot point. 1825 */ 1826 @ViewDebug.ExportedProperty 1827 private float mRotationY = 0f; 1828 1829 /** 1830 * The degrees rotation around the horizontal axis through the pivot point. 1831 */ 1832 @ViewDebug.ExportedProperty 1833 private float mRotationX = 0f; 1834 1835 /** 1836 * The degrees rotation around the pivot point. 1837 */ 1838 @ViewDebug.ExportedProperty 1839 private float mRotation = 0f; 1840 1841 /** 1842 * The amount of translation of the object away from its left property (post-layout). 1843 */ 1844 @ViewDebug.ExportedProperty 1845 private float mTranslationX = 0f; 1846 1847 /** 1848 * The amount of translation of the object away from its top property (post-layout). 1849 */ 1850 @ViewDebug.ExportedProperty 1851 private float mTranslationY = 0f; 1852 1853 /** 1854 * The amount of scale in the x direction around the pivot point. A 1855 * value of 1 means no scaling is applied. 1856 */ 1857 @ViewDebug.ExportedProperty 1858 private float mScaleX = 1f; 1859 1860 /** 1861 * The amount of scale in the y direction around the pivot point. A 1862 * value of 1 means no scaling is applied. 1863 */ 1864 @ViewDebug.ExportedProperty 1865 private float mScaleY = 1f; 1866 1867 /** 1868 * The amount of scale in the x direction around the pivot point. A 1869 * value of 1 means no scaling is applied. 1870 */ 1871 @ViewDebug.ExportedProperty 1872 private float mPivotX = 0f; 1873 1874 /** 1875 * The amount of scale in the y direction around the pivot point. A 1876 * value of 1 means no scaling is applied. 1877 */ 1878 @ViewDebug.ExportedProperty 1879 private float mPivotY = 0f; 1880 1881 /** 1882 * The opacity of the View. This is a value from 0 to 1, where 0 means 1883 * completely transparent and 1 means completely opaque. 1884 */ 1885 @ViewDebug.ExportedProperty 1886 private float mAlpha = 1f; 1887 1888 /** 1889 * The distance in pixels from the left edge of this view's parent 1890 * to the left edge of this view. 1891 * {@hide} 1892 */ 1893 @ViewDebug.ExportedProperty(category = "layout") 1894 protected int mLeft; 1895 /** 1896 * The distance in pixels from the left edge of this view's parent 1897 * to the right edge of this view. 1898 * {@hide} 1899 */ 1900 @ViewDebug.ExportedProperty(category = "layout") 1901 protected int mRight; 1902 /** 1903 * The distance in pixels from the top edge of this view's parent 1904 * to the top edge of this view. 1905 * {@hide} 1906 */ 1907 @ViewDebug.ExportedProperty(category = "layout") 1908 protected int mTop; 1909 /** 1910 * The distance in pixels from the top edge of this view's parent 1911 * to the bottom edge of this view. 1912 * {@hide} 1913 */ 1914 @ViewDebug.ExportedProperty(category = "layout") 1915 protected int mBottom; 1916 1917 /** 1918 * The offset, in pixels, by which the content of this view is scrolled 1919 * horizontally. 1920 * {@hide} 1921 */ 1922 @ViewDebug.ExportedProperty(category = "scrolling") 1923 protected int mScrollX; 1924 /** 1925 * The offset, in pixels, by which the content of this view is scrolled 1926 * vertically. 1927 * {@hide} 1928 */ 1929 @ViewDebug.ExportedProperty(category = "scrolling") 1930 protected int mScrollY; 1931 1932 /** 1933 * The left padding in pixels, that is the distance in pixels between the 1934 * left edge of this view and the left edge of its content. 1935 * {@hide} 1936 */ 1937 @ViewDebug.ExportedProperty(category = "padding") 1938 protected int mPaddingLeft; 1939 /** 1940 * The right padding in pixels, that is the distance in pixels between the 1941 * right edge of this view and the right edge of its content. 1942 * {@hide} 1943 */ 1944 @ViewDebug.ExportedProperty(category = "padding") 1945 protected int mPaddingRight; 1946 /** 1947 * The top padding in pixels, that is the distance in pixels between the 1948 * top edge of this view and the top edge of its content. 1949 * {@hide} 1950 */ 1951 @ViewDebug.ExportedProperty(category = "padding") 1952 protected int mPaddingTop; 1953 /** 1954 * The bottom padding in pixels, that is the distance in pixels between the 1955 * bottom edge of this view and the bottom edge of its content. 1956 * {@hide} 1957 */ 1958 @ViewDebug.ExportedProperty(category = "padding") 1959 protected int mPaddingBottom; 1960 1961 /** 1962 * Briefly describes the view and is primarily used for accessibility support. 1963 */ 1964 private CharSequence mContentDescription; 1965 1966 /** 1967 * Cache the paddingRight set by the user to append to the scrollbar's size. 1968 */ 1969 @ViewDebug.ExportedProperty(category = "padding") 1970 int mUserPaddingRight; 1971 1972 /** 1973 * Cache the paddingBottom set by the user to append to the scrollbar's size. 1974 */ 1975 @ViewDebug.ExportedProperty(category = "padding") 1976 int mUserPaddingBottom; 1977 1978 /** 1979 * Cache the paddingLeft set by the user to append to the scrollbar's size. 1980 */ 1981 @ViewDebug.ExportedProperty(category = "padding") 1982 int mUserPaddingLeft; 1983 1984 /** 1985 * @hide 1986 */ 1987 int mOldWidthMeasureSpec = Integer.MIN_VALUE; 1988 /** 1989 * @hide 1990 */ 1991 int mOldHeightMeasureSpec = Integer.MIN_VALUE; 1992 1993 private Resources mResources = null; 1994 1995 private Drawable mBGDrawable; 1996 1997 private int mBackgroundResource; 1998 private boolean mBackgroundSizeChanged; 1999 2000 /** 2001 * Listener used to dispatch focus change events. 2002 * This field should be made private, so it is hidden from the SDK. 2003 * {@hide} 2004 */ 2005 protected OnFocusChangeListener mOnFocusChangeListener; 2006 2007 /** 2008 * Listeners for layout change events. 2009 */ 2010 private ArrayList<OnLayoutChangeListener> mOnLayoutChangeListeners; 2011 2012 /** 2013 * Listener used to dispatch click events. 2014 * This field should be made private, so it is hidden from the SDK. 2015 * {@hide} 2016 */ 2017 protected OnClickListener mOnClickListener; 2018 2019 /** 2020 * Listener used to dispatch long click events. 2021 * This field should be made private, so it is hidden from the SDK. 2022 * {@hide} 2023 */ 2024 protected OnLongClickListener mOnLongClickListener; 2025 2026 /** 2027 * Listener used to build the context menu. 2028 * This field should be made private, so it is hidden from the SDK. 2029 * {@hide} 2030 */ 2031 protected OnCreateContextMenuListener mOnCreateContextMenuListener; 2032 2033 private OnKeyListener mOnKeyListener; 2034 2035 private OnTouchListener mOnTouchListener; 2036 2037 private OnDragListener mOnDragListener; 2038 2039 /** 2040 * The application environment this view lives in. 2041 * This field should be made private, so it is hidden from the SDK. 2042 * {@hide} 2043 */ 2044 protected Context mContext; 2045 2046 private ScrollabilityCache mScrollCache; 2047 2048 private int[] mDrawableState = null; 2049 2050 private Bitmap mDrawingCache; 2051 private Bitmap mUnscaledDrawingCache; 2052 private DisplayList mDisplayList; 2053 private HardwareLayer mHardwareLayer; 2054 2055 /** 2056 * When this view has focus and the next focus is {@link #FOCUS_LEFT}, 2057 * the user may specify which view to go to next. 2058 */ 2059 private int mNextFocusLeftId = View.NO_ID; 2060 2061 /** 2062 * When this view has focus and the next focus is {@link #FOCUS_RIGHT}, 2063 * the user may specify which view to go to next. 2064 */ 2065 private int mNextFocusRightId = View.NO_ID; 2066 2067 /** 2068 * When this view has focus and the next focus is {@link #FOCUS_UP}, 2069 * the user may specify which view to go to next. 2070 */ 2071 private int mNextFocusUpId = View.NO_ID; 2072 2073 /** 2074 * When this view has focus and the next focus is {@link #FOCUS_DOWN}, 2075 * the user may specify which view to go to next. 2076 */ 2077 private int mNextFocusDownId = View.NO_ID; 2078 2079 /** 2080 * When this view has focus and the next focus is {@link #FOCUS_FORWARD}, 2081 * the user may specify which view to go to next. 2082 */ 2083 int mNextFocusForwardId = View.NO_ID; 2084 2085 private CheckForLongPress mPendingCheckForLongPress; 2086 private CheckForTap mPendingCheckForTap = null; 2087 private PerformClick mPerformClick; 2088 2089 private UnsetPressedState mUnsetPressedState; 2090 2091 /** 2092 * Whether the long press's action has been invoked. The tap's action is invoked on the 2093 * up event while a long press is invoked as soon as the long press duration is reached, so 2094 * a long press could be performed before the tap is checked, in which case the tap's action 2095 * should not be invoked. 2096 */ 2097 private boolean mHasPerformedLongPress; 2098 2099 /** 2100 * The minimum height of the view. We'll try our best to have the height 2101 * of this view to at least this amount. 2102 */ 2103 @ViewDebug.ExportedProperty(category = "measurement") 2104 private int mMinHeight; 2105 2106 /** 2107 * The minimum width of the view. We'll try our best to have the width 2108 * of this view to at least this amount. 2109 */ 2110 @ViewDebug.ExportedProperty(category = "measurement") 2111 private int mMinWidth; 2112 2113 /** 2114 * The delegate to handle touch events that are physically in this view 2115 * but should be handled by another view. 2116 */ 2117 private TouchDelegate mTouchDelegate = null; 2118 2119 /** 2120 * Solid color to use as a background when creating the drawing cache. Enables 2121 * the cache to use 16 bit bitmaps instead of 32 bit. 2122 */ 2123 private int mDrawingCacheBackgroundColor = 0; 2124 2125 /** 2126 * Special tree observer used when mAttachInfo is null. 2127 */ 2128 private ViewTreeObserver mFloatingTreeObserver; 2129 2130 /** 2131 * Cache the touch slop from the context that created the view. 2132 */ 2133 private int mTouchSlop; 2134 2135 /** 2136 * Cache drag/drop state 2137 * 2138 */ 2139 boolean mCanAcceptDrop; 2140 2141 /** 2142 * Flag indicating that a drag can cross window boundaries 2143 * @hide 2144 */ 2145 public static final int DRAG_FLAG_GLOBAL = 1; 2146 2147 /** 2148 * Position of the vertical scroll bar. 2149 */ 2150 private int mVerticalScrollbarPosition; 2151 2152 /** 2153 * Position the scroll bar at the default position as determined by the system. 2154 */ 2155 public static final int SCROLLBAR_POSITION_DEFAULT = 0; 2156 2157 /** 2158 * Position the scroll bar along the left edge. 2159 */ 2160 public static final int SCROLLBAR_POSITION_LEFT = 1; 2161 2162 /** 2163 * Position the scroll bar along the right edge. 2164 */ 2165 public static final int SCROLLBAR_POSITION_RIGHT = 2; 2166 2167 /** 2168 * Indicates that the view does not have a layer. 2169 * 2170 * @see #getLayerType() 2171 * @see #setLayerType(int, android.graphics.Paint) 2172 * @see #LAYER_TYPE_SOFTWARE 2173 * @see #LAYER_TYPE_HARDWARE 2174 */ 2175 public static final int LAYER_TYPE_NONE = 0; 2176 2177 /** 2178 * <p>Indicates that the view has a software layer. A software layer is backed 2179 * by a bitmap and causes the view to be rendered using Android's software 2180 * rendering pipeline, even if hardware acceleration is enabled.</p> 2181 * 2182 * <p>Software layers have various usages:</p> 2183 * <p>When the application is not using hardware acceleration, a software layer 2184 * is useful to apply a specific color filter and/or blending mode and/or 2185 * translucency to a view and all its children.</p> 2186 * <p>When the application is using hardware acceleration, a software layer 2187 * is useful to render drawing primitives not supported by the hardware 2188 * accelerated pipeline. It can also be used to cache a complex view tree 2189 * into a texture and reduce the complexity of drawing operations. For instance, 2190 * when animating a complex view tree with a translation, a software layer can 2191 * be used to render the view tree only once.</p> 2192 * <p>Software layers should be avoided when the affected view tree updates 2193 * often. Every update will require to re-render the software layer, which can 2194 * potentially be slow (particularly when hardware acceleration is turned on 2195 * since the layer will have to be uploaded into a hardware texture after every 2196 * update.)</p> 2197 * 2198 * @see #getLayerType() 2199 * @see #setLayerType(int, android.graphics.Paint) 2200 * @see #LAYER_TYPE_NONE 2201 * @see #LAYER_TYPE_HARDWARE 2202 */ 2203 public static final int LAYER_TYPE_SOFTWARE = 1; 2204 2205 /** 2206 * <p>Indicates that the view has a hardware layer. A hardware layer is backed 2207 * by a hardware specific texture (generally Frame Buffer Objects or FBO on 2208 * OpenGL hardware) and causes the view to be rendered using Android's hardware 2209 * rendering pipeline, but only if hardware acceleration is turned on for the 2210 * view hierarchy. When hardware acceleration is turned off, hardware layers 2211 * behave exactly as {@link #LAYER_TYPE_SOFTWARE software layers}.</p> 2212 * 2213 * <p>A hardware layer is useful to apply a specific color filter and/or 2214 * blending mode and/or translucency to a view and all its children.</p> 2215 * <p>A hardware layer can be used to cache a complex view tree into a 2216 * texture and reduce the complexity of drawing operations. For instance, 2217 * when animating a complex view tree with a translation, a hardware layer can 2218 * be used to render the view tree only once.</p> 2219 * <p>A hardware layer can also be used to increase the rendering quality when 2220 * rotation transformations are applied on a view. It can also be used to 2221 * prevent potential clipping issues when applying 3D transforms on a view.</p> 2222 * 2223 * @see #getLayerType() 2224 * @see #setLayerType(int, android.graphics.Paint) 2225 * @see #LAYER_TYPE_NONE 2226 * @see #LAYER_TYPE_SOFTWARE 2227 */ 2228 public static final int LAYER_TYPE_HARDWARE = 2; 2229 2230 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 2231 @ViewDebug.IntToString(from = LAYER_TYPE_NONE, to = "NONE"), 2232 @ViewDebug.IntToString(from = LAYER_TYPE_SOFTWARE, to = "SOFTWARE"), 2233 @ViewDebug.IntToString(from = LAYER_TYPE_HARDWARE, to = "HARDWARE") 2234 }) 2235 int mLayerType = LAYER_TYPE_NONE; 2236 Paint mLayerPaint; 2237 2238 /** 2239 * Simple constructor to use when creating a view from code. 2240 * 2241 * @param context The Context the view is running in, through which it can 2242 * access the current theme, resources, etc. 2243 */ 2244 public View(Context context) { 2245 mContext = context; 2246 mResources = context != null ? context.getResources() : null; 2247 mViewFlags = SOUND_EFFECTS_ENABLED | HAPTIC_FEEDBACK_ENABLED; 2248 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); 2249 setOverScrollMode(OVER_SCROLL_IF_CONTENT_SCROLLS); 2250 } 2251 2252 /** 2253 * Constructor that is called when inflating a view from XML. This is called 2254 * when a view is being constructed from an XML file, supplying attributes 2255 * that were specified in the XML file. This version uses a default style of 2256 * 0, so the only attribute values applied are those in the Context's Theme 2257 * and the given AttributeSet. 2258 * 2259 * <p> 2260 * The method onFinishInflate() will be called after all children have been 2261 * added. 2262 * 2263 * @param context The Context the view is running in, through which it can 2264 * access the current theme, resources, etc. 2265 * @param attrs The attributes of the XML tag that is inflating the view. 2266 * @see #View(Context, AttributeSet, int) 2267 */ 2268 public View(Context context, AttributeSet attrs) { 2269 this(context, attrs, 0); 2270 } 2271 2272 /** 2273 * Perform inflation from XML and apply a class-specific base style. This 2274 * constructor of View allows subclasses to use their own base style when 2275 * they are inflating. For example, a Button class's constructor would call 2276 * this version of the super class constructor and supply 2277 * <code>R.attr.buttonStyle</code> for <var>defStyle</var>; this allows 2278 * the theme's button style to modify all of the base view attributes (in 2279 * particular its background) as well as the Button class's attributes. 2280 * 2281 * @param context The Context the view is running in, through which it can 2282 * access the current theme, resources, etc. 2283 * @param attrs The attributes of the XML tag that is inflating the view. 2284 * @param defStyle The default style to apply to this view. If 0, no style 2285 * will be applied (beyond what is included in the theme). This may 2286 * either be an attribute resource, whose value will be retrieved 2287 * from the current theme, or an explicit style resource. 2288 * @see #View(Context, AttributeSet) 2289 */ 2290 public View(Context context, AttributeSet attrs, int defStyle) { 2291 this(context); 2292 2293 TypedArray a = context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.View, 2294 defStyle, 0); 2295 2296 Drawable background = null; 2297 2298 int leftPadding = -1; 2299 int topPadding = -1; 2300 int rightPadding = -1; 2301 int bottomPadding = -1; 2302 2303 int padding = -1; 2304 2305 int viewFlagValues = 0; 2306 int viewFlagMasks = 0; 2307 2308 boolean setScrollContainer = false; 2309 2310 int x = 0; 2311 int y = 0; 2312 2313 float tx = 0; 2314 float ty = 0; 2315 float rotation = 0; 2316 float rotationX = 0; 2317 float rotationY = 0; 2318 float sx = 1f; 2319 float sy = 1f; 2320 boolean transformSet = false; 2321 2322 int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY; 2323 2324 int overScrollMode = mOverScrollMode; 2325 final int N = a.getIndexCount(); 2326 for (int i = 0; i < N; i++) { 2327 int attr = a.getIndex(i); 2328 switch (attr) { 2329 case com.android.internal.R.styleable.View_background: 2330 background = a.getDrawable(attr); 2331 break; 2332 case com.android.internal.R.styleable.View_padding: 2333 padding = a.getDimensionPixelSize(attr, -1); 2334 break; 2335 case com.android.internal.R.styleable.View_paddingLeft: 2336 leftPadding = a.getDimensionPixelSize(attr, -1); 2337 break; 2338 case com.android.internal.R.styleable.View_paddingTop: 2339 topPadding = a.getDimensionPixelSize(attr, -1); 2340 break; 2341 case com.android.internal.R.styleable.View_paddingRight: 2342 rightPadding = a.getDimensionPixelSize(attr, -1); 2343 break; 2344 case com.android.internal.R.styleable.View_paddingBottom: 2345 bottomPadding = a.getDimensionPixelSize(attr, -1); 2346 break; 2347 case com.android.internal.R.styleable.View_scrollX: 2348 x = a.getDimensionPixelOffset(attr, 0); 2349 break; 2350 case com.android.internal.R.styleable.View_scrollY: 2351 y = a.getDimensionPixelOffset(attr, 0); 2352 break; 2353 case com.android.internal.R.styleable.View_alpha: 2354 setAlpha(a.getFloat(attr, 1f)); 2355 break; 2356 case com.android.internal.R.styleable.View_transformPivotX: 2357 setPivotX(a.getDimensionPixelOffset(attr, 0)); 2358 break; 2359 case com.android.internal.R.styleable.View_transformPivotY: 2360 setPivotY(a.getDimensionPixelOffset(attr, 0)); 2361 break; 2362 case com.android.internal.R.styleable.View_translationX: 2363 tx = a.getDimensionPixelOffset(attr, 0); 2364 transformSet = true; 2365 break; 2366 case com.android.internal.R.styleable.View_translationY: 2367 ty = a.getDimensionPixelOffset(attr, 0); 2368 transformSet = true; 2369 break; 2370 case com.android.internal.R.styleable.View_rotation: 2371 rotation = a.getFloat(attr, 0); 2372 transformSet = true; 2373 break; 2374 case com.android.internal.R.styleable.View_rotationX: 2375 rotationX = a.getFloat(attr, 0); 2376 transformSet = true; 2377 break; 2378 case com.android.internal.R.styleable.View_rotationY: 2379 rotationY = a.getFloat(attr, 0); 2380 transformSet = true; 2381 break; 2382 case com.android.internal.R.styleable.View_scaleX: 2383 sx = a.getFloat(attr, 1f); 2384 transformSet = true; 2385 break; 2386 case com.android.internal.R.styleable.View_scaleY: 2387 sy = a.getFloat(attr, 1f); 2388 transformSet = true; 2389 break; 2390 case com.android.internal.R.styleable.View_id: 2391 mID = a.getResourceId(attr, NO_ID); 2392 break; 2393 case com.android.internal.R.styleable.View_tag: 2394 mTag = a.getText(attr); 2395 break; 2396 case com.android.internal.R.styleable.View_fitsSystemWindows: 2397 if (a.getBoolean(attr, false)) { 2398 viewFlagValues |= FITS_SYSTEM_WINDOWS; 2399 viewFlagMasks |= FITS_SYSTEM_WINDOWS; 2400 } 2401 break; 2402 case com.android.internal.R.styleable.View_focusable: 2403 if (a.getBoolean(attr, false)) { 2404 viewFlagValues |= FOCUSABLE; 2405 viewFlagMasks |= FOCUSABLE_MASK; 2406 } 2407 break; 2408 case com.android.internal.R.styleable.View_focusableInTouchMode: 2409 if (a.getBoolean(attr, false)) { 2410 viewFlagValues |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE; 2411 viewFlagMasks |= FOCUSABLE_IN_TOUCH_MODE | FOCUSABLE_MASK; 2412 } 2413 break; 2414 case com.android.internal.R.styleable.View_clickable: 2415 if (a.getBoolean(attr, false)) { 2416 viewFlagValues |= CLICKABLE; 2417 viewFlagMasks |= CLICKABLE; 2418 } 2419 break; 2420 case com.android.internal.R.styleable.View_longClickable: 2421 if (a.getBoolean(attr, false)) { 2422 viewFlagValues |= LONG_CLICKABLE; 2423 viewFlagMasks |= LONG_CLICKABLE; 2424 } 2425 break; 2426 case com.android.internal.R.styleable.View_saveEnabled: 2427 if (!a.getBoolean(attr, true)) { 2428 viewFlagValues |= SAVE_DISABLED; 2429 viewFlagMasks |= SAVE_DISABLED_MASK; 2430 } 2431 break; 2432 case com.android.internal.R.styleable.View_duplicateParentState: 2433 if (a.getBoolean(attr, false)) { 2434 viewFlagValues |= DUPLICATE_PARENT_STATE; 2435 viewFlagMasks |= DUPLICATE_PARENT_STATE; 2436 } 2437 break; 2438 case com.android.internal.R.styleable.View_visibility: 2439 final int visibility = a.getInt(attr, 0); 2440 if (visibility != 0) { 2441 viewFlagValues |= VISIBILITY_FLAGS[visibility]; 2442 viewFlagMasks |= VISIBILITY_MASK; 2443 } 2444 break; 2445 case com.android.internal.R.styleable.View_drawingCacheQuality: 2446 final int cacheQuality = a.getInt(attr, 0); 2447 if (cacheQuality != 0) { 2448 viewFlagValues |= DRAWING_CACHE_QUALITY_FLAGS[cacheQuality]; 2449 viewFlagMasks |= DRAWING_CACHE_QUALITY_MASK; 2450 } 2451 break; 2452 case com.android.internal.R.styleable.View_contentDescription: 2453 mContentDescription = a.getString(attr); 2454 break; 2455 case com.android.internal.R.styleable.View_soundEffectsEnabled: 2456 if (!a.getBoolean(attr, true)) { 2457 viewFlagValues &= ~SOUND_EFFECTS_ENABLED; 2458 viewFlagMasks |= SOUND_EFFECTS_ENABLED; 2459 } 2460 break; 2461 case com.android.internal.R.styleable.View_hapticFeedbackEnabled: 2462 if (!a.getBoolean(attr, true)) { 2463 viewFlagValues &= ~HAPTIC_FEEDBACK_ENABLED; 2464 viewFlagMasks |= HAPTIC_FEEDBACK_ENABLED; 2465 } 2466 break; 2467 case R.styleable.View_scrollbars: 2468 final int scrollbars = a.getInt(attr, SCROLLBARS_NONE); 2469 if (scrollbars != SCROLLBARS_NONE) { 2470 viewFlagValues |= scrollbars; 2471 viewFlagMasks |= SCROLLBARS_MASK; 2472 initializeScrollbars(a); 2473 } 2474 break; 2475 case R.styleable.View_fadingEdge: 2476 final int fadingEdge = a.getInt(attr, FADING_EDGE_NONE); 2477 if (fadingEdge != FADING_EDGE_NONE) { 2478 viewFlagValues |= fadingEdge; 2479 viewFlagMasks |= FADING_EDGE_MASK; 2480 initializeFadingEdge(a); 2481 } 2482 break; 2483 case R.styleable.View_scrollbarStyle: 2484 scrollbarStyle = a.getInt(attr, SCROLLBARS_INSIDE_OVERLAY); 2485 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2486 viewFlagValues |= scrollbarStyle & SCROLLBARS_STYLE_MASK; 2487 viewFlagMasks |= SCROLLBARS_STYLE_MASK; 2488 } 2489 break; 2490 case R.styleable.View_isScrollContainer: 2491 setScrollContainer = true; 2492 if (a.getBoolean(attr, false)) { 2493 setScrollContainer(true); 2494 } 2495 break; 2496 case com.android.internal.R.styleable.View_keepScreenOn: 2497 if (a.getBoolean(attr, false)) { 2498 viewFlagValues |= KEEP_SCREEN_ON; 2499 viewFlagMasks |= KEEP_SCREEN_ON; 2500 } 2501 break; 2502 case R.styleable.View_filterTouchesWhenObscured: 2503 if (a.getBoolean(attr, false)) { 2504 viewFlagValues |= FILTER_TOUCHES_WHEN_OBSCURED; 2505 viewFlagMasks |= FILTER_TOUCHES_WHEN_OBSCURED; 2506 } 2507 break; 2508 case R.styleable.View_nextFocusLeft: 2509 mNextFocusLeftId = a.getResourceId(attr, View.NO_ID); 2510 break; 2511 case R.styleable.View_nextFocusRight: 2512 mNextFocusRightId = a.getResourceId(attr, View.NO_ID); 2513 break; 2514 case R.styleable.View_nextFocusUp: 2515 mNextFocusUpId = a.getResourceId(attr, View.NO_ID); 2516 break; 2517 case R.styleable.View_nextFocusDown: 2518 mNextFocusDownId = a.getResourceId(attr, View.NO_ID); 2519 break; 2520 case R.styleable.View_nextFocusForward: 2521 mNextFocusForwardId = a.getResourceId(attr, View.NO_ID); 2522 break; 2523 case R.styleable.View_minWidth: 2524 mMinWidth = a.getDimensionPixelSize(attr, 0); 2525 break; 2526 case R.styleable.View_minHeight: 2527 mMinHeight = a.getDimensionPixelSize(attr, 0); 2528 break; 2529 case R.styleable.View_onClick: 2530 if (context.isRestricted()) { 2531 throw new IllegalStateException("The android:onClick attribute cannot " 2532 + "be used within a restricted context"); 2533 } 2534 2535 final String handlerName = a.getString(attr); 2536 if (handlerName != null) { 2537 setOnClickListener(new OnClickListener() { 2538 private Method mHandler; 2539 2540 public void onClick(View v) { 2541 if (mHandler == null) { 2542 try { 2543 mHandler = getContext().getClass().getMethod(handlerName, 2544 View.class); 2545 } catch (NoSuchMethodException e) { 2546 int id = getId(); 2547 String idText = id == NO_ID ? "" : " with id '" 2548 + getContext().getResources().getResourceEntryName( 2549 id) + "'"; 2550 throw new IllegalStateException("Could not find a method " + 2551 handlerName + "(View) in the activity " 2552 + getContext().getClass() + " for onClick handler" 2553 + " on view " + View.this.getClass() + idText, e); 2554 } 2555 } 2556 2557 try { 2558 mHandler.invoke(getContext(), View.this); 2559 } catch (IllegalAccessException e) { 2560 throw new IllegalStateException("Could not execute non " 2561 + "public method of the activity", e); 2562 } catch (InvocationTargetException e) { 2563 throw new IllegalStateException("Could not execute " 2564 + "method of the activity", e); 2565 } 2566 } 2567 }); 2568 } 2569 break; 2570 case R.styleable.View_overScrollMode: 2571 overScrollMode = a.getInt(attr, OVER_SCROLL_IF_CONTENT_SCROLLS); 2572 break; 2573 case R.styleable.View_verticalScrollbarPosition: 2574 mVerticalScrollbarPosition = a.getInt(attr, SCROLLBAR_POSITION_DEFAULT); 2575 break; 2576 case R.styleable.View_layerType: 2577 setLayerType(a.getInt(attr, LAYER_TYPE_NONE), null); 2578 break; 2579 } 2580 } 2581 2582 setOverScrollMode(overScrollMode); 2583 2584 if (background != null) { 2585 setBackgroundDrawable(background); 2586 } 2587 2588 if (padding >= 0) { 2589 leftPadding = padding; 2590 topPadding = padding; 2591 rightPadding = padding; 2592 bottomPadding = padding; 2593 } 2594 2595 // If the user specified the padding (either with android:padding or 2596 // android:paddingLeft/Top/Right/Bottom), use this padding, otherwise 2597 // use the default padding or the padding from the background drawable 2598 // (stored at this point in mPadding*) 2599 setPadding(leftPadding >= 0 ? leftPadding : mPaddingLeft, 2600 topPadding >= 0 ? topPadding : mPaddingTop, 2601 rightPadding >= 0 ? rightPadding : mPaddingRight, 2602 bottomPadding >= 0 ? bottomPadding : mPaddingBottom); 2603 2604 if (viewFlagMasks != 0) { 2605 setFlags(viewFlagValues, viewFlagMasks); 2606 } 2607 2608 // Needs to be called after mViewFlags is set 2609 if (scrollbarStyle != SCROLLBARS_INSIDE_OVERLAY) { 2610 recomputePadding(); 2611 } 2612 2613 if (x != 0 || y != 0) { 2614 scrollTo(x, y); 2615 } 2616 2617 if (transformSet) { 2618 setTranslationX(tx); 2619 setTranslationY(ty); 2620 setRotation(rotation); 2621 setRotationX(rotationX); 2622 setRotationY(rotationY); 2623 setScaleX(sx); 2624 setScaleY(sy); 2625 } 2626 2627 if (!setScrollContainer && (viewFlagValues&SCROLLBARS_VERTICAL) != 0) { 2628 setScrollContainer(true); 2629 } 2630 2631 computeOpaqueFlags(); 2632 2633 a.recycle(); 2634 } 2635 2636 /** 2637 * Non-public constructor for use in testing 2638 */ 2639 View() { 2640 } 2641 2642 /** 2643 * <p> 2644 * Initializes the fading edges from a given set of styled attributes. This 2645 * method should be called by subclasses that need fading edges and when an 2646 * instance of these subclasses is created programmatically rather than 2647 * being inflated from XML. This method is automatically called when the XML 2648 * is inflated. 2649 * </p> 2650 * 2651 * @param a the styled attributes set to initialize the fading edges from 2652 */ 2653 protected void initializeFadingEdge(TypedArray a) { 2654 initScrollCache(); 2655 2656 mScrollCache.fadingEdgeLength = a.getDimensionPixelSize( 2657 R.styleable.View_fadingEdgeLength, 2658 ViewConfiguration.get(mContext).getScaledFadingEdgeLength()); 2659 } 2660 2661 /** 2662 * Returns the size of the vertical faded edges used to indicate that more 2663 * content in this view is visible. 2664 * 2665 * @return The size in pixels of the vertical faded edge or 0 if vertical 2666 * faded edges are not enabled for this view. 2667 * @attr ref android.R.styleable#View_fadingEdgeLength 2668 */ 2669 public int getVerticalFadingEdgeLength() { 2670 if (isVerticalFadingEdgeEnabled()) { 2671 ScrollabilityCache cache = mScrollCache; 2672 if (cache != null) { 2673 return cache.fadingEdgeLength; 2674 } 2675 } 2676 return 0; 2677 } 2678 2679 /** 2680 * Set the size of the faded edge used to indicate that more content in this 2681 * view is available. Will not change whether the fading edge is enabled; use 2682 * {@link #setVerticalFadingEdgeEnabled} or {@link #setHorizontalFadingEdgeEnabled} 2683 * to enable the fading edge for the vertical or horizontal fading edges. 2684 * 2685 * @param length The size in pixels of the faded edge used to indicate that more 2686 * content in this view is visible. 2687 */ 2688 public void setFadingEdgeLength(int length) { 2689 initScrollCache(); 2690 mScrollCache.fadingEdgeLength = length; 2691 } 2692 2693 /** 2694 * Returns the size of the horizontal faded edges used to indicate that more 2695 * content in this view is visible. 2696 * 2697 * @return The size in pixels of the horizontal faded edge or 0 if horizontal 2698 * faded edges are not enabled for this view. 2699 * @attr ref android.R.styleable#View_fadingEdgeLength 2700 */ 2701 public int getHorizontalFadingEdgeLength() { 2702 if (isHorizontalFadingEdgeEnabled()) { 2703 ScrollabilityCache cache = mScrollCache; 2704 if (cache != null) { 2705 return cache.fadingEdgeLength; 2706 } 2707 } 2708 return 0; 2709 } 2710 2711 /** 2712 * Returns the width of the vertical scrollbar. 2713 * 2714 * @return The width in pixels of the vertical scrollbar or 0 if there 2715 * is no vertical scrollbar. 2716 */ 2717 public int getVerticalScrollbarWidth() { 2718 ScrollabilityCache cache = mScrollCache; 2719 if (cache != null) { 2720 ScrollBarDrawable scrollBar = cache.scrollBar; 2721 if (scrollBar != null) { 2722 int size = scrollBar.getSize(true); 2723 if (size <= 0) { 2724 size = cache.scrollBarSize; 2725 } 2726 return size; 2727 } 2728 return 0; 2729 } 2730 return 0; 2731 } 2732 2733 /** 2734 * Returns the height of the horizontal scrollbar. 2735 * 2736 * @return The height in pixels of the horizontal scrollbar or 0 if 2737 * there is no horizontal scrollbar. 2738 */ 2739 protected int getHorizontalScrollbarHeight() { 2740 ScrollabilityCache cache = mScrollCache; 2741 if (cache != null) { 2742 ScrollBarDrawable scrollBar = cache.scrollBar; 2743 if (scrollBar != null) { 2744 int size = scrollBar.getSize(false); 2745 if (size <= 0) { 2746 size = cache.scrollBarSize; 2747 } 2748 return size; 2749 } 2750 return 0; 2751 } 2752 return 0; 2753 } 2754 2755 /** 2756 * <p> 2757 * Initializes the scrollbars from a given set of styled attributes. This 2758 * method should be called by subclasses that need scrollbars and when an 2759 * instance of these subclasses is created programmatically rather than 2760 * being inflated from XML. This method is automatically called when the XML 2761 * is inflated. 2762 * </p> 2763 * 2764 * @param a the styled attributes set to initialize the scrollbars from 2765 */ 2766 protected void initializeScrollbars(TypedArray a) { 2767 initScrollCache(); 2768 2769 final ScrollabilityCache scrollabilityCache = mScrollCache; 2770 2771 if (scrollabilityCache.scrollBar == null) { 2772 scrollabilityCache.scrollBar = new ScrollBarDrawable(); 2773 } 2774 2775 final boolean fadeScrollbars = a.getBoolean(R.styleable.View_fadeScrollbars, true); 2776 2777 if (!fadeScrollbars) { 2778 scrollabilityCache.state = ScrollabilityCache.ON; 2779 } 2780 scrollabilityCache.fadeScrollBars = fadeScrollbars; 2781 2782 2783 scrollabilityCache.scrollBarFadeDuration = a.getInt( 2784 R.styleable.View_scrollbarFadeDuration, ViewConfiguration 2785 .getScrollBarFadeDuration()); 2786 scrollabilityCache.scrollBarDefaultDelayBeforeFade = a.getInt( 2787 R.styleable.View_scrollbarDefaultDelayBeforeFade, 2788 ViewConfiguration.getScrollDefaultDelay()); 2789 2790 2791 scrollabilityCache.scrollBarSize = a.getDimensionPixelSize( 2792 com.android.internal.R.styleable.View_scrollbarSize, 2793 ViewConfiguration.get(mContext).getScaledScrollBarSize()); 2794 2795 Drawable track = a.getDrawable(R.styleable.View_scrollbarTrackHorizontal); 2796 scrollabilityCache.scrollBar.setHorizontalTrackDrawable(track); 2797 2798 Drawable thumb = a.getDrawable(R.styleable.View_scrollbarThumbHorizontal); 2799 if (thumb != null) { 2800 scrollabilityCache.scrollBar.setHorizontalThumbDrawable(thumb); 2801 } 2802 2803 boolean alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawHorizontalTrack, 2804 false); 2805 if (alwaysDraw) { 2806 scrollabilityCache.scrollBar.setAlwaysDrawHorizontalTrack(true); 2807 } 2808 2809 track = a.getDrawable(R.styleable.View_scrollbarTrackVertical); 2810 scrollabilityCache.scrollBar.setVerticalTrackDrawable(track); 2811 2812 thumb = a.getDrawable(R.styleable.View_scrollbarThumbVertical); 2813 if (thumb != null) { 2814 scrollabilityCache.scrollBar.setVerticalThumbDrawable(thumb); 2815 } 2816 2817 alwaysDraw = a.getBoolean(R.styleable.View_scrollbarAlwaysDrawVerticalTrack, 2818 false); 2819 if (alwaysDraw) { 2820 scrollabilityCache.scrollBar.setAlwaysDrawVerticalTrack(true); 2821 } 2822 2823 // Re-apply user/background padding so that scrollbar(s) get added 2824 recomputePadding(); 2825 } 2826 2827 /** 2828 * <p> 2829 * Initalizes the scrollability cache if necessary. 2830 * </p> 2831 */ 2832 private void initScrollCache() { 2833 if (mScrollCache == null) { 2834 mScrollCache = new ScrollabilityCache(ViewConfiguration.get(mContext), this); 2835 } 2836 } 2837 2838 /** 2839 * Set the position of the vertical scroll bar. Should be one of 2840 * {@link #SCROLLBAR_POSITION_DEFAULT}, {@link #SCROLLBAR_POSITION_LEFT} or 2841 * {@link #SCROLLBAR_POSITION_RIGHT}. 2842 * 2843 * @param position Where the vertical scroll bar should be positioned. 2844 */ 2845 public void setVerticalScrollbarPosition(int position) { 2846 if (mVerticalScrollbarPosition != position) { 2847 mVerticalScrollbarPosition = position; 2848 computeOpaqueFlags(); 2849 recomputePadding(); 2850 } 2851 } 2852 2853 /** 2854 * @return The position where the vertical scroll bar will show, if applicable. 2855 * @see #setVerticalScrollbarPosition(int) 2856 */ 2857 public int getVerticalScrollbarPosition() { 2858 return mVerticalScrollbarPosition; 2859 } 2860 2861 /** 2862 * Register a callback to be invoked when focus of this view changed. 2863 * 2864 * @param l The callback that will run. 2865 */ 2866 public void setOnFocusChangeListener(OnFocusChangeListener l) { 2867 mOnFocusChangeListener = l; 2868 } 2869 2870 /** 2871 * Add a listener that will be called when the bounds of the view change due to 2872 * layout processing. 2873 * 2874 * @param listener The listener that will be called when layout bounds change. 2875 */ 2876 public void addOnLayoutChangeListener(OnLayoutChangeListener listener) { 2877 if (mOnLayoutChangeListeners == null) { 2878 mOnLayoutChangeListeners = new ArrayList<OnLayoutChangeListener>(); 2879 } 2880 mOnLayoutChangeListeners.add(listener); 2881 } 2882 2883 /** 2884 * Remove a listener for layout changes. 2885 * 2886 * @param listener The listener for layout bounds change. 2887 */ 2888 public void removeOnLayoutChangeListener(OnLayoutChangeListener listener) { 2889 if (mOnLayoutChangeListeners == null) { 2890 return; 2891 } 2892 mOnLayoutChangeListeners.remove(listener); 2893 } 2894 2895 /** 2896 * Gets the current list of listeners for layout changes. 2897 */ 2898 public List<OnLayoutChangeListener> getOnLayoutChangeListeners() { 2899 return mOnLayoutChangeListeners; 2900 } 2901 2902 /** 2903 * Returns the focus-change callback registered for this view. 2904 * 2905 * @return The callback, or null if one is not registered. 2906 */ 2907 public OnFocusChangeListener getOnFocusChangeListener() { 2908 return mOnFocusChangeListener; 2909 } 2910 2911 /** 2912 * Register a callback to be invoked when this view is clicked. If this view is not 2913 * clickable, it becomes clickable. 2914 * 2915 * @param l The callback that will run 2916 * 2917 * @see #setClickable(boolean) 2918 */ 2919 public void setOnClickListener(OnClickListener l) { 2920 if (!isClickable()) { 2921 setClickable(true); 2922 } 2923 mOnClickListener = l; 2924 } 2925 2926 /** 2927 * Register a callback to be invoked when this view is clicked and held. If this view is not 2928 * long clickable, it becomes long clickable. 2929 * 2930 * @param l The callback that will run 2931 * 2932 * @see #setLongClickable(boolean) 2933 */ 2934 public void setOnLongClickListener(OnLongClickListener l) { 2935 if (!isLongClickable()) { 2936 setLongClickable(true); 2937 } 2938 mOnLongClickListener = l; 2939 } 2940 2941 /** 2942 * Register a callback to be invoked when the context menu for this view is 2943 * being built. If this view is not long clickable, it becomes long clickable. 2944 * 2945 * @param l The callback that will run 2946 * 2947 */ 2948 public void setOnCreateContextMenuListener(OnCreateContextMenuListener l) { 2949 if (!isLongClickable()) { 2950 setLongClickable(true); 2951 } 2952 mOnCreateContextMenuListener = l; 2953 } 2954 2955 /** 2956 * Call this view's OnClickListener, if it is defined. 2957 * 2958 * @return True there was an assigned OnClickListener that was called, false 2959 * otherwise is returned. 2960 */ 2961 public boolean performClick() { 2962 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED); 2963 2964 if (mOnClickListener != null) { 2965 playSoundEffect(SoundEffectConstants.CLICK); 2966 mOnClickListener.onClick(this); 2967 return true; 2968 } 2969 2970 return false; 2971 } 2972 2973 /** 2974 * Call this view's OnLongClickListener, if it is defined. Invokes the context menu if the 2975 * OnLongClickListener did not consume the event. 2976 * 2977 * @return True if one of the above receivers consumed the event, false otherwise. 2978 */ 2979 public boolean performLongClick() { 2980 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_LONG_CLICKED); 2981 2982 boolean handled = false; 2983 if (mOnLongClickListener != null) { 2984 handled = mOnLongClickListener.onLongClick(View.this); 2985 } 2986 if (!handled) { 2987 handled = showContextMenu(); 2988 } 2989 if (handled) { 2990 performHapticFeedback(HapticFeedbackConstants.LONG_PRESS); 2991 } 2992 return handled; 2993 } 2994 2995 /** 2996 * Bring up the context menu for this view. 2997 * 2998 * @return Whether a context menu was displayed. 2999 */ 3000 public boolean showContextMenu() { 3001 return getParent().showContextMenuForChild(this); 3002 } 3003 3004 /** 3005 * Start an action mode. 3006 * 3007 * @param callback Callback that will control the lifecycle of the action mode 3008 * @return The new action mode if it is started, null otherwise 3009 * 3010 * @see ActionMode 3011 */ 3012 public ActionMode startActionMode(ActionMode.Callback callback) { 3013 return getParent().startActionModeForChild(this, callback); 3014 } 3015 3016 /** 3017 * Register a callback to be invoked when a key is pressed in this view. 3018 * @param l the key listener to attach to this view 3019 */ 3020 public void setOnKeyListener(OnKeyListener l) { 3021 mOnKeyListener = l; 3022 } 3023 3024 /** 3025 * Register a callback to be invoked when a touch event is sent to this view. 3026 * @param l the touch listener to attach to this view 3027 */ 3028 public void setOnTouchListener(OnTouchListener l) { 3029 mOnTouchListener = l; 3030 } 3031 3032 /** 3033 * Register a callback to be invoked when a drag event is sent to this view. 3034 * @param l The drag listener to attach to this view 3035 */ 3036 public void setOnDragListener(OnDragListener l) { 3037 mOnDragListener = l; 3038 } 3039 3040 /** 3041 * Give this view focus. This will cause {@link #onFocusChanged} to be called. 3042 * 3043 * Note: this does not check whether this {@link View} should get focus, it just 3044 * gives it focus no matter what. It should only be called internally by framework 3045 * code that knows what it is doing, namely {@link #requestFocus(int, Rect)}. 3046 * 3047 * @param direction values are View.FOCUS_UP, View.FOCUS_DOWN, 3048 * View.FOCUS_LEFT or View.FOCUS_RIGHT. This is the direction which 3049 * focus moved when requestFocus() is called. It may not always 3050 * apply, in which case use the default View.FOCUS_DOWN. 3051 * @param previouslyFocusedRect The rectangle of the view that had focus 3052 * prior in this View's coordinate system. 3053 */ 3054 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 3055 if (DBG) { 3056 System.out.println(this + " requestFocus()"); 3057 } 3058 3059 if ((mPrivateFlags & FOCUSED) == 0) { 3060 mPrivateFlags |= FOCUSED; 3061 3062 if (mParent != null) { 3063 mParent.requestChildFocus(this, this); 3064 } 3065 3066 onFocusChanged(true, direction, previouslyFocusedRect); 3067 refreshDrawableState(); 3068 } 3069 } 3070 3071 /** 3072 * Request that a rectangle of this view be visible on the screen, 3073 * scrolling if necessary just enough. 3074 * 3075 * <p>A View should call this if it maintains some notion of which part 3076 * of its content is interesting. For example, a text editing view 3077 * should call this when its cursor moves. 3078 * 3079 * @param rectangle The rectangle. 3080 * @return Whether any parent scrolled. 3081 */ 3082 public boolean requestRectangleOnScreen(Rect rectangle) { 3083 return requestRectangleOnScreen(rectangle, false); 3084 } 3085 3086 /** 3087 * Request that a rectangle of this view be visible on the screen, 3088 * scrolling if necessary just enough. 3089 * 3090 * <p>A View should call this if it maintains some notion of which part 3091 * of its content is interesting. For example, a text editing view 3092 * should call this when its cursor moves. 3093 * 3094 * <p>When <code>immediate</code> is set to true, scrolling will not be 3095 * animated. 3096 * 3097 * @param rectangle The rectangle. 3098 * @param immediate True to forbid animated scrolling, false otherwise 3099 * @return Whether any parent scrolled. 3100 */ 3101 public boolean requestRectangleOnScreen(Rect rectangle, boolean immediate) { 3102 View child = this; 3103 ViewParent parent = mParent; 3104 boolean scrolled = false; 3105 while (parent != null) { 3106 scrolled |= parent.requestChildRectangleOnScreen(child, 3107 rectangle, immediate); 3108 3109 // offset rect so next call has the rectangle in the 3110 // coordinate system of its direct child. 3111 rectangle.offset(child.getLeft(), child.getTop()); 3112 rectangle.offset(-child.getScrollX(), -child.getScrollY()); 3113 3114 if (!(parent instanceof View)) { 3115 break; 3116 } 3117 3118 child = (View) parent; 3119 parent = child.getParent(); 3120 } 3121 return scrolled; 3122 } 3123 3124 /** 3125 * Called when this view wants to give up focus. This will cause 3126 * {@link #onFocusChanged} to be called. 3127 */ 3128 public void clearFocus() { 3129 if (DBG) { 3130 System.out.println(this + " clearFocus()"); 3131 } 3132 3133 if ((mPrivateFlags & FOCUSED) != 0) { 3134 mPrivateFlags &= ~FOCUSED; 3135 3136 if (mParent != null) { 3137 mParent.clearChildFocus(this); 3138 } 3139 3140 onFocusChanged(false, 0, null); 3141 refreshDrawableState(); 3142 } 3143 } 3144 3145 /** 3146 * Called to clear the focus of a view that is about to be removed. 3147 * Doesn't call clearChildFocus, which prevents this view from taking 3148 * focus again before it has been removed from the parent 3149 */ 3150 void clearFocusForRemoval() { 3151 if ((mPrivateFlags & FOCUSED) != 0) { 3152 mPrivateFlags &= ~FOCUSED; 3153 3154 onFocusChanged(false, 0, null); 3155 refreshDrawableState(); 3156 } 3157 } 3158 3159 /** 3160 * Called internally by the view system when a new view is getting focus. 3161 * This is what clears the old focus. 3162 */ 3163 void unFocus() { 3164 if (DBG) { 3165 System.out.println(this + " unFocus()"); 3166 } 3167 3168 if ((mPrivateFlags & FOCUSED) != 0) { 3169 mPrivateFlags &= ~FOCUSED; 3170 3171 onFocusChanged(false, 0, null); 3172 refreshDrawableState(); 3173 } 3174 } 3175 3176 /** 3177 * Returns true if this view has focus iteself, or is the ancestor of the 3178 * view that has focus. 3179 * 3180 * @return True if this view has or contains focus, false otherwise. 3181 */ 3182 @ViewDebug.ExportedProperty(category = "focus") 3183 public boolean hasFocus() { 3184 return (mPrivateFlags & FOCUSED) != 0; 3185 } 3186 3187 /** 3188 * Returns true if this view is focusable or if it contains a reachable View 3189 * for which {@link #hasFocusable()} returns true. A "reachable hasFocusable()" 3190 * is a View whose parents do not block descendants focus. 3191 * 3192 * Only {@link #VISIBLE} views are considered focusable. 3193 * 3194 * @return True if the view is focusable or if the view contains a focusable 3195 * View, false otherwise. 3196 * 3197 * @see ViewGroup#FOCUS_BLOCK_DESCENDANTS 3198 */ 3199 public boolean hasFocusable() { 3200 return (mViewFlags & VISIBILITY_MASK) == VISIBLE && isFocusable(); 3201 } 3202 3203 /** 3204 * Called by the view system when the focus state of this view changes. 3205 * When the focus change event is caused by directional navigation, direction 3206 * and previouslyFocusedRect provide insight into where the focus is coming from. 3207 * When overriding, be sure to call up through to the super class so that 3208 * the standard focus handling will occur. 3209 * 3210 * @param gainFocus True if the View has focus; false otherwise. 3211 * @param direction The direction focus has moved when requestFocus() 3212 * is called to give this view focus. Values are 3213 * {@link #FOCUS_UP}, {@link #FOCUS_DOWN}, {@link #FOCUS_LEFT}, 3214 * {@link #FOCUS_RIGHT}, {@link #FOCUS_FORWARD}, or {@link #FOCUS_BACKWARD}. 3215 * It may not always apply, in which case use the default. 3216 * @param previouslyFocusedRect The rectangle, in this view's coordinate 3217 * system, of the previously focused view. If applicable, this will be 3218 * passed in as finer grained information about where the focus is coming 3219 * from (in addition to direction). Will be <code>null</code> otherwise. 3220 */ 3221 protected void onFocusChanged(boolean gainFocus, int direction, Rect previouslyFocusedRect) { 3222 if (gainFocus) { 3223 sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_FOCUSED); 3224 } 3225 3226 InputMethodManager imm = InputMethodManager.peekInstance(); 3227 if (!gainFocus) { 3228 if (isPressed()) { 3229 setPressed(false); 3230 } 3231 if (imm != null && mAttachInfo != null 3232 && mAttachInfo.mHasWindowFocus) { 3233 imm.focusOut(this); 3234 } 3235 onFocusLost(); 3236 } else if (imm != null && mAttachInfo != null 3237 && mAttachInfo.mHasWindowFocus) { 3238 imm.focusIn(this); 3239 } 3240 3241 invalidate(); 3242 if (mOnFocusChangeListener != null) { 3243 mOnFocusChangeListener.onFocusChange(this, gainFocus); 3244 } 3245 3246 if (mAttachInfo != null) { 3247 mAttachInfo.mKeyDispatchState.reset(this); 3248 } 3249 } 3250 3251 /** 3252 * {@inheritDoc} 3253 */ 3254 public void sendAccessibilityEvent(int eventType) { 3255 if (AccessibilityManager.getInstance(mContext).isEnabled()) { 3256 sendAccessibilityEventUnchecked(AccessibilityEvent.obtain(eventType)); 3257 } 3258 } 3259 3260 /** 3261 * {@inheritDoc} 3262 */ 3263 public void sendAccessibilityEventUnchecked(AccessibilityEvent event) { 3264 event.setClassName(getClass().getName()); 3265 event.setPackageName(getContext().getPackageName()); 3266 event.setEnabled(isEnabled()); 3267 event.setContentDescription(mContentDescription); 3268 3269 if (event.getEventType() == AccessibilityEvent.TYPE_VIEW_FOCUSED && mAttachInfo != null) { 3270 ArrayList<View> focusablesTempList = mAttachInfo.mFocusablesTempList; 3271 getRootView().addFocusables(focusablesTempList, View.FOCUS_FORWARD, FOCUSABLES_ALL); 3272 event.setItemCount(focusablesTempList.size()); 3273 event.setCurrentItemIndex(focusablesTempList.indexOf(this)); 3274 focusablesTempList.clear(); 3275 } 3276 3277 dispatchPopulateAccessibilityEvent(event); 3278 3279 AccessibilityManager.getInstance(mContext).sendAccessibilityEvent(event); 3280 } 3281 3282 /** 3283 * Dispatches an {@link AccessibilityEvent} to the {@link View} children 3284 * to be populated. 3285 * 3286 * @param event The event. 3287 * 3288 * @return True if the event population was completed. 3289 */ 3290 public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) { 3291 return false; 3292 } 3293 3294 /** 3295 * Gets the {@link View} description. It briefly describes the view and is 3296 * primarily used for accessibility support. Set this property to enable 3297 * better accessibility support for your application. This is especially 3298 * true for views that do not have textual representation (For example, 3299 * ImageButton). 3300 * 3301 * @return The content descriptiopn. 3302 * 3303 * @attr ref android.R.styleable#View_contentDescription 3304 */ 3305 public CharSequence getContentDescription() { 3306 return mContentDescription; 3307 } 3308 3309 /** 3310 * Sets the {@link View} description. It briefly describes the view and is 3311 * primarily used for accessibility support. Set this property to enable 3312 * better accessibility support for your application. This is especially 3313 * true for views that do not have textual representation (For example, 3314 * ImageButton). 3315 * 3316 * @param contentDescription The content description. 3317 * 3318 * @attr ref android.R.styleable#View_contentDescription 3319 */ 3320 public void setContentDescription(CharSequence contentDescription) { 3321 mContentDescription = contentDescription; 3322 } 3323 3324 /** 3325 * Invoked whenever this view loses focus, either by losing window focus or by losing 3326 * focus within its window. This method can be used to clear any state tied to the 3327 * focus. For instance, if a button is held pressed with the trackball and the window 3328 * loses focus, this method can be used to cancel the press. 3329 * 3330 * Subclasses of View overriding this method should always call super.onFocusLost(). 3331 * 3332 * @see #onFocusChanged(boolean, int, android.graphics.Rect) 3333 * @see #onWindowFocusChanged(boolean) 3334 * 3335 * @hide pending API council approval 3336 */ 3337 protected void onFocusLost() { 3338 resetPressedState(); 3339 } 3340 3341 private void resetPressedState() { 3342 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 3343 return; 3344 } 3345 3346 if (isPressed()) { 3347 setPressed(false); 3348 3349 if (!mHasPerformedLongPress) { 3350 removeLongPressCallback(); 3351 } 3352 } 3353 } 3354 3355 /** 3356 * Returns true if this view has focus 3357 * 3358 * @return True if this view has focus, false otherwise. 3359 */ 3360 @ViewDebug.ExportedProperty(category = "focus") 3361 public boolean isFocused() { 3362 return (mPrivateFlags & FOCUSED) != 0; 3363 } 3364 3365 /** 3366 * Find the view in the hierarchy rooted at this view that currently has 3367 * focus. 3368 * 3369 * @return The view that currently has focus, or null if no focused view can 3370 * be found. 3371 */ 3372 public View findFocus() { 3373 return (mPrivateFlags & FOCUSED) != 0 ? this : null; 3374 } 3375 3376 /** 3377 * Change whether this view is one of the set of scrollable containers in 3378 * its window. This will be used to determine whether the window can 3379 * resize or must pan when a soft input area is open -- scrollable 3380 * containers allow the window to use resize mode since the container 3381 * will appropriately shrink. 3382 */ 3383 public void setScrollContainer(boolean isScrollContainer) { 3384 if (isScrollContainer) { 3385 if (mAttachInfo != null && (mPrivateFlags&SCROLL_CONTAINER_ADDED) == 0) { 3386 mAttachInfo.mScrollContainers.add(this); 3387 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 3388 } 3389 mPrivateFlags |= SCROLL_CONTAINER; 3390 } else { 3391 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 3392 mAttachInfo.mScrollContainers.remove(this); 3393 } 3394 mPrivateFlags &= ~(SCROLL_CONTAINER|SCROLL_CONTAINER_ADDED); 3395 } 3396 } 3397 3398 /** 3399 * Returns the quality of the drawing cache. 3400 * 3401 * @return One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3402 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3403 * 3404 * @see #setDrawingCacheQuality(int) 3405 * @see #setDrawingCacheEnabled(boolean) 3406 * @see #isDrawingCacheEnabled() 3407 * 3408 * @attr ref android.R.styleable#View_drawingCacheQuality 3409 */ 3410 public int getDrawingCacheQuality() { 3411 return mViewFlags & DRAWING_CACHE_QUALITY_MASK; 3412 } 3413 3414 /** 3415 * Set the drawing cache quality of this view. This value is used only when the 3416 * drawing cache is enabled 3417 * 3418 * @param quality One of {@link #DRAWING_CACHE_QUALITY_AUTO}, 3419 * {@link #DRAWING_CACHE_QUALITY_LOW}, or {@link #DRAWING_CACHE_QUALITY_HIGH} 3420 * 3421 * @see #getDrawingCacheQuality() 3422 * @see #setDrawingCacheEnabled(boolean) 3423 * @see #isDrawingCacheEnabled() 3424 * 3425 * @attr ref android.R.styleable#View_drawingCacheQuality 3426 */ 3427 public void setDrawingCacheQuality(int quality) { 3428 setFlags(quality, DRAWING_CACHE_QUALITY_MASK); 3429 } 3430 3431 /** 3432 * Returns whether the screen should remain on, corresponding to the current 3433 * value of {@link #KEEP_SCREEN_ON}. 3434 * 3435 * @return Returns true if {@link #KEEP_SCREEN_ON} is set. 3436 * 3437 * @see #setKeepScreenOn(boolean) 3438 * 3439 * @attr ref android.R.styleable#View_keepScreenOn 3440 */ 3441 public boolean getKeepScreenOn() { 3442 return (mViewFlags & KEEP_SCREEN_ON) != 0; 3443 } 3444 3445 /** 3446 * Controls whether the screen should remain on, modifying the 3447 * value of {@link #KEEP_SCREEN_ON}. 3448 * 3449 * @param keepScreenOn Supply true to set {@link #KEEP_SCREEN_ON}. 3450 * 3451 * @see #getKeepScreenOn() 3452 * 3453 * @attr ref android.R.styleable#View_keepScreenOn 3454 */ 3455 public void setKeepScreenOn(boolean keepScreenOn) { 3456 setFlags(keepScreenOn ? KEEP_SCREEN_ON : 0, KEEP_SCREEN_ON); 3457 } 3458 3459 /** 3460 * Gets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3461 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3462 * 3463 * @attr ref android.R.styleable#View_nextFocusLeft 3464 */ 3465 public int getNextFocusLeftId() { 3466 return mNextFocusLeftId; 3467 } 3468 3469 /** 3470 * Sets the id of the view to use when the next focus is {@link #FOCUS_LEFT}. 3471 * @param nextFocusLeftId The next focus ID, or {@link #NO_ID} if the framework should 3472 * decide automatically. 3473 * 3474 * @attr ref android.R.styleable#View_nextFocusLeft 3475 */ 3476 public void setNextFocusLeftId(int nextFocusLeftId) { 3477 mNextFocusLeftId = nextFocusLeftId; 3478 } 3479 3480 /** 3481 * Gets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3482 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3483 * 3484 * @attr ref android.R.styleable#View_nextFocusRight 3485 */ 3486 public int getNextFocusRightId() { 3487 return mNextFocusRightId; 3488 } 3489 3490 /** 3491 * Sets the id of the view to use when the next focus is {@link #FOCUS_RIGHT}. 3492 * @param nextFocusRightId The next focus ID, or {@link #NO_ID} if the framework should 3493 * decide automatically. 3494 * 3495 * @attr ref android.R.styleable#View_nextFocusRight 3496 */ 3497 public void setNextFocusRightId(int nextFocusRightId) { 3498 mNextFocusRightId = nextFocusRightId; 3499 } 3500 3501 /** 3502 * Gets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3503 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3504 * 3505 * @attr ref android.R.styleable#View_nextFocusUp 3506 */ 3507 public int getNextFocusUpId() { 3508 return mNextFocusUpId; 3509 } 3510 3511 /** 3512 * Sets the id of the view to use when the next focus is {@link #FOCUS_UP}. 3513 * @param nextFocusUpId The next focus ID, or {@link #NO_ID} if the framework should 3514 * decide automatically. 3515 * 3516 * @attr ref android.R.styleable#View_nextFocusUp 3517 */ 3518 public void setNextFocusUpId(int nextFocusUpId) { 3519 mNextFocusUpId = nextFocusUpId; 3520 } 3521 3522 /** 3523 * Gets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3524 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3525 * 3526 * @attr ref android.R.styleable#View_nextFocusDown 3527 */ 3528 public int getNextFocusDownId() { 3529 return mNextFocusDownId; 3530 } 3531 3532 /** 3533 * Sets the id of the view to use when the next focus is {@link #FOCUS_DOWN}. 3534 * @param nextFocusDownId The next focus ID, or {@link #NO_ID} if the framework should 3535 * decide automatically. 3536 * 3537 * @attr ref android.R.styleable#View_nextFocusDown 3538 */ 3539 public void setNextFocusDownId(int nextFocusDownId) { 3540 mNextFocusDownId = nextFocusDownId; 3541 } 3542 3543 /** 3544 * Gets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3545 * @return The next focus ID, or {@link #NO_ID} if the framework should decide automatically. 3546 * 3547 * @attr ref android.R.styleable#View_nextFocusForward 3548 */ 3549 public int getNextFocusForwardId() { 3550 return mNextFocusForwardId; 3551 } 3552 3553 /** 3554 * Sets the id of the view to use when the next focus is {@link #FOCUS_FORWARD}. 3555 * @param nextFocusForwardId The next focus ID, or {@link #NO_ID} if the framework should 3556 * decide automatically. 3557 * 3558 * @attr ref android.R.styleable#View_nextFocusForward 3559 */ 3560 public void setNextFocusForwardId(int nextFocusForwardId) { 3561 mNextFocusForwardId = nextFocusForwardId; 3562 } 3563 3564 /** 3565 * Returns the visibility of this view and all of its ancestors 3566 * 3567 * @return True if this view and all of its ancestors are {@link #VISIBLE} 3568 */ 3569 public boolean isShown() { 3570 View current = this; 3571 //noinspection ConstantConditions 3572 do { 3573 if ((current.mViewFlags & VISIBILITY_MASK) != VISIBLE) { 3574 return false; 3575 } 3576 ViewParent parent = current.mParent; 3577 if (parent == null) { 3578 return false; // We are not attached to the view root 3579 } 3580 if (!(parent instanceof View)) { 3581 return true; 3582 } 3583 current = (View) parent; 3584 } while (current != null); 3585 3586 return false; 3587 } 3588 3589 /** 3590 * Apply the insets for system windows to this view, if the FITS_SYSTEM_WINDOWS flag 3591 * is set 3592 * 3593 * @param insets Insets for system windows 3594 * 3595 * @return True if this view applied the insets, false otherwise 3596 */ 3597 protected boolean fitSystemWindows(Rect insets) { 3598 if ((mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS) { 3599 mPaddingLeft = insets.left; 3600 mPaddingTop = insets.top; 3601 mPaddingRight = insets.right; 3602 mPaddingBottom = insets.bottom; 3603 requestLayout(); 3604 return true; 3605 } 3606 return false; 3607 } 3608 3609 /** 3610 * Determine if this view has the FITS_SYSTEM_WINDOWS flag set. 3611 * @return True if window has FITS_SYSTEM_WINDOWS set 3612 * 3613 * @hide 3614 */ 3615 public boolean isFitsSystemWindowsFlagSet() { 3616 return (mViewFlags & FITS_SYSTEM_WINDOWS) == FITS_SYSTEM_WINDOWS; 3617 } 3618 3619 /** 3620 * Returns the visibility status for this view. 3621 * 3622 * @return One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3623 * @attr ref android.R.styleable#View_visibility 3624 */ 3625 @ViewDebug.ExportedProperty(mapping = { 3626 @ViewDebug.IntToString(from = VISIBLE, to = "VISIBLE"), 3627 @ViewDebug.IntToString(from = INVISIBLE, to = "INVISIBLE"), 3628 @ViewDebug.IntToString(from = GONE, to = "GONE") 3629 }) 3630 public int getVisibility() { 3631 return mViewFlags & VISIBILITY_MASK; 3632 } 3633 3634 /** 3635 * Set the enabled state of this view. 3636 * 3637 * @param visibility One of {@link #VISIBLE}, {@link #INVISIBLE}, or {@link #GONE}. 3638 * @attr ref android.R.styleable#View_visibility 3639 */ 3640 @RemotableViewMethod 3641 public void setVisibility(int visibility) { 3642 setFlags(visibility, VISIBILITY_MASK); 3643 if (mBGDrawable != null) mBGDrawable.setVisible(visibility == VISIBLE, false); 3644 } 3645 3646 /** 3647 * Returns the enabled status for this view. The interpretation of the 3648 * enabled state varies by subclass. 3649 * 3650 * @return True if this view is enabled, false otherwise. 3651 */ 3652 @ViewDebug.ExportedProperty 3653 public boolean isEnabled() { 3654 return (mViewFlags & ENABLED_MASK) == ENABLED; 3655 } 3656 3657 /** 3658 * Set the enabled state of this view. The interpretation of the enabled 3659 * state varies by subclass. 3660 * 3661 * @param enabled True if this view is enabled, false otherwise. 3662 */ 3663 @RemotableViewMethod 3664 public void setEnabled(boolean enabled) { 3665 if (enabled == isEnabled()) return; 3666 3667 setFlags(enabled ? ENABLED : DISABLED, ENABLED_MASK); 3668 3669 /* 3670 * The View most likely has to change its appearance, so refresh 3671 * the drawable state. 3672 */ 3673 refreshDrawableState(); 3674 3675 // Invalidate too, since the default behavior for views is to be 3676 // be drawn at 50% alpha rather than to change the drawable. 3677 invalidate(); 3678 } 3679 3680 /** 3681 * Set whether this view can receive the focus. 3682 * 3683 * Setting this to false will also ensure that this view is not focusable 3684 * in touch mode. 3685 * 3686 * @param focusable If true, this view can receive the focus. 3687 * 3688 * @see #setFocusableInTouchMode(boolean) 3689 * @attr ref android.R.styleable#View_focusable 3690 */ 3691 public void setFocusable(boolean focusable) { 3692 if (!focusable) { 3693 setFlags(0, FOCUSABLE_IN_TOUCH_MODE); 3694 } 3695 setFlags(focusable ? FOCUSABLE : NOT_FOCUSABLE, FOCUSABLE_MASK); 3696 } 3697 3698 /** 3699 * Set whether this view can receive focus while in touch mode. 3700 * 3701 * Setting this to true will also ensure that this view is focusable. 3702 * 3703 * @param focusableInTouchMode If true, this view can receive the focus while 3704 * in touch mode. 3705 * 3706 * @see #setFocusable(boolean) 3707 * @attr ref android.R.styleable#View_focusableInTouchMode 3708 */ 3709 public void setFocusableInTouchMode(boolean focusableInTouchMode) { 3710 // Focusable in touch mode should always be set before the focusable flag 3711 // otherwise, setting the focusable flag will trigger a focusableViewAvailable() 3712 // which, in touch mode, will not successfully request focus on this view 3713 // because the focusable in touch mode flag is not set 3714 setFlags(focusableInTouchMode ? FOCUSABLE_IN_TOUCH_MODE : 0, FOCUSABLE_IN_TOUCH_MODE); 3715 if (focusableInTouchMode) { 3716 setFlags(FOCUSABLE, FOCUSABLE_MASK); 3717 } 3718 } 3719 3720 /** 3721 * Set whether this view should have sound effects enabled for events such as 3722 * clicking and touching. 3723 * 3724 * <p>You may wish to disable sound effects for a view if you already play sounds, 3725 * for instance, a dial key that plays dtmf tones. 3726 * 3727 * @param soundEffectsEnabled whether sound effects are enabled for this view. 3728 * @see #isSoundEffectsEnabled() 3729 * @see #playSoundEffect(int) 3730 * @attr ref android.R.styleable#View_soundEffectsEnabled 3731 */ 3732 public void setSoundEffectsEnabled(boolean soundEffectsEnabled) { 3733 setFlags(soundEffectsEnabled ? SOUND_EFFECTS_ENABLED: 0, SOUND_EFFECTS_ENABLED); 3734 } 3735 3736 /** 3737 * @return whether this view should have sound effects enabled for events such as 3738 * clicking and touching. 3739 * 3740 * @see #setSoundEffectsEnabled(boolean) 3741 * @see #playSoundEffect(int) 3742 * @attr ref android.R.styleable#View_soundEffectsEnabled 3743 */ 3744 @ViewDebug.ExportedProperty 3745 public boolean isSoundEffectsEnabled() { 3746 return SOUND_EFFECTS_ENABLED == (mViewFlags & SOUND_EFFECTS_ENABLED); 3747 } 3748 3749 /** 3750 * Set whether this view should have haptic feedback for events such as 3751 * long presses. 3752 * 3753 * <p>You may wish to disable haptic feedback if your view already controls 3754 * its own haptic feedback. 3755 * 3756 * @param hapticFeedbackEnabled whether haptic feedback enabled for this view. 3757 * @see #isHapticFeedbackEnabled() 3758 * @see #performHapticFeedback(int) 3759 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3760 */ 3761 public void setHapticFeedbackEnabled(boolean hapticFeedbackEnabled) { 3762 setFlags(hapticFeedbackEnabled ? HAPTIC_FEEDBACK_ENABLED: 0, HAPTIC_FEEDBACK_ENABLED); 3763 } 3764 3765 /** 3766 * @return whether this view should have haptic feedback enabled for events 3767 * long presses. 3768 * 3769 * @see #setHapticFeedbackEnabled(boolean) 3770 * @see #performHapticFeedback(int) 3771 * @attr ref android.R.styleable#View_hapticFeedbackEnabled 3772 */ 3773 @ViewDebug.ExportedProperty 3774 public boolean isHapticFeedbackEnabled() { 3775 return HAPTIC_FEEDBACK_ENABLED == (mViewFlags & HAPTIC_FEEDBACK_ENABLED); 3776 } 3777 3778 /** 3779 * If this view doesn't do any drawing on its own, set this flag to 3780 * allow further optimizations. By default, this flag is not set on 3781 * View, but could be set on some View subclasses such as ViewGroup. 3782 * 3783 * Typically, if you override {@link #onDraw} you should clear this flag. 3784 * 3785 * @param willNotDraw whether or not this View draw on its own 3786 */ 3787 public void setWillNotDraw(boolean willNotDraw) { 3788 setFlags(willNotDraw ? WILL_NOT_DRAW : 0, DRAW_MASK); 3789 } 3790 3791 /** 3792 * Returns whether or not this View draws on its own. 3793 * 3794 * @return true if this view has nothing to draw, false otherwise 3795 */ 3796 @ViewDebug.ExportedProperty(category = "drawing") 3797 public boolean willNotDraw() { 3798 return (mViewFlags & DRAW_MASK) == WILL_NOT_DRAW; 3799 } 3800 3801 /** 3802 * When a View's drawing cache is enabled, drawing is redirected to an 3803 * offscreen bitmap. Some views, like an ImageView, must be able to 3804 * bypass this mechanism if they already draw a single bitmap, to avoid 3805 * unnecessary usage of the memory. 3806 * 3807 * @param willNotCacheDrawing true if this view does not cache its 3808 * drawing, false otherwise 3809 */ 3810 public void setWillNotCacheDrawing(boolean willNotCacheDrawing) { 3811 setFlags(willNotCacheDrawing ? WILL_NOT_CACHE_DRAWING : 0, WILL_NOT_CACHE_DRAWING); 3812 } 3813 3814 /** 3815 * Returns whether or not this View can cache its drawing or not. 3816 * 3817 * @return true if this view does not cache its drawing, false otherwise 3818 */ 3819 @ViewDebug.ExportedProperty(category = "drawing") 3820 public boolean willNotCacheDrawing() { 3821 return (mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING; 3822 } 3823 3824 /** 3825 * Indicates whether this view reacts to click events or not. 3826 * 3827 * @return true if the view is clickable, false otherwise 3828 * 3829 * @see #setClickable(boolean) 3830 * @attr ref android.R.styleable#View_clickable 3831 */ 3832 @ViewDebug.ExportedProperty 3833 public boolean isClickable() { 3834 return (mViewFlags & CLICKABLE) == CLICKABLE; 3835 } 3836 3837 /** 3838 * Enables or disables click events for this view. When a view 3839 * is clickable it will change its state to "pressed" on every click. 3840 * Subclasses should set the view clickable to visually react to 3841 * user's clicks. 3842 * 3843 * @param clickable true to make the view clickable, false otherwise 3844 * 3845 * @see #isClickable() 3846 * @attr ref android.R.styleable#View_clickable 3847 */ 3848 public void setClickable(boolean clickable) { 3849 setFlags(clickable ? CLICKABLE : 0, CLICKABLE); 3850 } 3851 3852 /** 3853 * Indicates whether this view reacts to long click events or not. 3854 * 3855 * @return true if the view is long clickable, false otherwise 3856 * 3857 * @see #setLongClickable(boolean) 3858 * @attr ref android.R.styleable#View_longClickable 3859 */ 3860 public boolean isLongClickable() { 3861 return (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE; 3862 } 3863 3864 /** 3865 * Enables or disables long click events for this view. When a view is long 3866 * clickable it reacts to the user holding down the button for a longer 3867 * duration than a tap. This event can either launch the listener or a 3868 * context menu. 3869 * 3870 * @param longClickable true to make the view long clickable, false otherwise 3871 * @see #isLongClickable() 3872 * @attr ref android.R.styleable#View_longClickable 3873 */ 3874 public void setLongClickable(boolean longClickable) { 3875 setFlags(longClickable ? LONG_CLICKABLE : 0, LONG_CLICKABLE); 3876 } 3877 3878 /** 3879 * Sets the pressed state for this view. 3880 * 3881 * @see #isClickable() 3882 * @see #setClickable(boolean) 3883 * 3884 * @param pressed Pass true to set the View's internal state to "pressed", or false to reverts 3885 * the View's internal state from a previously set "pressed" state. 3886 */ 3887 public void setPressed(boolean pressed) { 3888 if (pressed) { 3889 mPrivateFlags |= PRESSED; 3890 } else { 3891 mPrivateFlags &= ~PRESSED; 3892 } 3893 refreshDrawableState(); 3894 dispatchSetPressed(pressed); 3895 } 3896 3897 /** 3898 * Dispatch setPressed to all of this View's children. 3899 * 3900 * @see #setPressed(boolean) 3901 * 3902 * @param pressed The new pressed state 3903 */ 3904 protected void dispatchSetPressed(boolean pressed) { 3905 } 3906 3907 /** 3908 * Indicates whether the view is currently in pressed state. Unless 3909 * {@link #setPressed(boolean)} is explicitly called, only clickable views can enter 3910 * the pressed state. 3911 * 3912 * @see #setPressed 3913 * @see #isClickable() 3914 * @see #setClickable(boolean) 3915 * 3916 * @return true if the view is currently pressed, false otherwise 3917 */ 3918 public boolean isPressed() { 3919 return (mPrivateFlags & PRESSED) == PRESSED; 3920 } 3921 3922 /** 3923 * Indicates whether this view will save its state (that is, 3924 * whether its {@link #onSaveInstanceState} method will be called). 3925 * 3926 * @return Returns true if the view state saving is enabled, else false. 3927 * 3928 * @see #setSaveEnabled(boolean) 3929 * @attr ref android.R.styleable#View_saveEnabled 3930 */ 3931 public boolean isSaveEnabled() { 3932 return (mViewFlags & SAVE_DISABLED_MASK) != SAVE_DISABLED; 3933 } 3934 3935 /** 3936 * Controls whether the saving of this view's state is 3937 * enabled (that is, whether its {@link #onSaveInstanceState} method 3938 * will be called). Note that even if freezing is enabled, the 3939 * view still must have an id assigned to it (via {@link #setId setId()}) 3940 * for its state to be saved. This flag can only disable the 3941 * saving of this view; any child views may still have their state saved. 3942 * 3943 * @param enabled Set to false to <em>disable</em> state saving, or true 3944 * (the default) to allow it. 3945 * 3946 * @see #isSaveEnabled() 3947 * @see #setId(int) 3948 * @see #onSaveInstanceState() 3949 * @attr ref android.R.styleable#View_saveEnabled 3950 */ 3951 public void setSaveEnabled(boolean enabled) { 3952 setFlags(enabled ? 0 : SAVE_DISABLED, SAVE_DISABLED_MASK); 3953 } 3954 3955 /** 3956 * Gets whether the framework should discard touches when the view's 3957 * window is obscured by another visible window. 3958 * Refer to the {@link View} security documentation for more details. 3959 * 3960 * @return True if touch filtering is enabled. 3961 * 3962 * @see #setFilterTouchesWhenObscured(boolean) 3963 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3964 */ 3965 @ViewDebug.ExportedProperty 3966 public boolean getFilterTouchesWhenObscured() { 3967 return (mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0; 3968 } 3969 3970 /** 3971 * Sets whether the framework should discard touches when the view's 3972 * window is obscured by another visible window. 3973 * Refer to the {@link View} security documentation for more details. 3974 * 3975 * @param enabled True if touch filtering should be enabled. 3976 * 3977 * @see #getFilterTouchesWhenObscured 3978 * @attr ref android.R.styleable#View_filterTouchesWhenObscured 3979 */ 3980 public void setFilterTouchesWhenObscured(boolean enabled) { 3981 setFlags(enabled ? 0 : FILTER_TOUCHES_WHEN_OBSCURED, 3982 FILTER_TOUCHES_WHEN_OBSCURED); 3983 } 3984 3985 /** 3986 * Indicates whether the entire hierarchy under this view will save its 3987 * state when a state saving traversal occurs from its parent. The default 3988 * is true; if false, these views will not be saved unless 3989 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 3990 * 3991 * @return Returns true if the view state saving from parent is enabled, else false. 3992 * 3993 * @see #setSaveFromParentEnabled(boolean) 3994 */ 3995 public boolean isSaveFromParentEnabled() { 3996 return (mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED; 3997 } 3998 3999 /** 4000 * Controls whether the entire hierarchy under this view will save its 4001 * state when a state saving traversal occurs from its parent. The default 4002 * is true; if false, these views will not be saved unless 4003 * {@link #saveHierarchyState(SparseArray)} is called directly on this view. 4004 * 4005 * @param enabled Set to false to <em>disable</em> state saving, or true 4006 * (the default) to allow it. 4007 * 4008 * @see #isSaveFromParentEnabled() 4009 * @see #setId(int) 4010 * @see #onSaveInstanceState() 4011 */ 4012 public void setSaveFromParentEnabled(boolean enabled) { 4013 setFlags(enabled ? 0 : PARENT_SAVE_DISABLED, PARENT_SAVE_DISABLED_MASK); 4014 } 4015 4016 4017 /** 4018 * Returns whether this View is able to take focus. 4019 * 4020 * @return True if this view can take focus, or false otherwise. 4021 * @attr ref android.R.styleable#View_focusable 4022 */ 4023 @ViewDebug.ExportedProperty(category = "focus") 4024 public final boolean isFocusable() { 4025 return FOCUSABLE == (mViewFlags & FOCUSABLE_MASK); 4026 } 4027 4028 /** 4029 * When a view is focusable, it may not want to take focus when in touch mode. 4030 * For example, a button would like focus when the user is navigating via a D-pad 4031 * so that the user can click on it, but once the user starts touching the screen, 4032 * the button shouldn't take focus 4033 * @return Whether the view is focusable in touch mode. 4034 * @attr ref android.R.styleable#View_focusableInTouchMode 4035 */ 4036 @ViewDebug.ExportedProperty 4037 public final boolean isFocusableInTouchMode() { 4038 return FOCUSABLE_IN_TOUCH_MODE == (mViewFlags & FOCUSABLE_IN_TOUCH_MODE); 4039 } 4040 4041 /** 4042 * Find the nearest view in the specified direction that can take focus. 4043 * This does not actually give focus to that view. 4044 * 4045 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4046 * 4047 * @return The nearest focusable in the specified direction, or null if none 4048 * can be found. 4049 */ 4050 public View focusSearch(int direction) { 4051 if (mParent != null) { 4052 return mParent.focusSearch(this, direction); 4053 } else { 4054 return null; 4055 } 4056 } 4057 4058 /** 4059 * This method is the last chance for the focused view and its ancestors to 4060 * respond to an arrow key. This is called when the focused view did not 4061 * consume the key internally, nor could the view system find a new view in 4062 * the requested direction to give focus to. 4063 * 4064 * @param focused The currently focused view. 4065 * @param direction The direction focus wants to move. One of FOCUS_UP, 4066 * FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT. 4067 * @return True if the this view consumed this unhandled move. 4068 */ 4069 public boolean dispatchUnhandledMove(View focused, int direction) { 4070 return false; 4071 } 4072 4073 /** 4074 * If a user manually specified the next view id for a particular direction, 4075 * use the root to look up the view. 4076 * @param root The root view of the hierarchy containing this view. 4077 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, FOCUS_RIGHT, FOCUS_FORWARD, 4078 * or FOCUS_BACKWARD. 4079 * @return The user specified next view, or null if there is none. 4080 */ 4081 View findUserSetNextFocus(View root, int direction) { 4082 switch (direction) { 4083 case FOCUS_LEFT: 4084 if (mNextFocusLeftId == View.NO_ID) return null; 4085 return findViewShouldExist(root, mNextFocusLeftId); 4086 case FOCUS_RIGHT: 4087 if (mNextFocusRightId == View.NO_ID) return null; 4088 return findViewShouldExist(root, mNextFocusRightId); 4089 case FOCUS_UP: 4090 if (mNextFocusUpId == View.NO_ID) return null; 4091 return findViewShouldExist(root, mNextFocusUpId); 4092 case FOCUS_DOWN: 4093 if (mNextFocusDownId == View.NO_ID) return null; 4094 return findViewShouldExist(root, mNextFocusDownId); 4095 case FOCUS_FORWARD: 4096 if (mNextFocusForwardId == View.NO_ID) return null; 4097 return findViewShouldExist(root, mNextFocusForwardId); 4098 case FOCUS_BACKWARD: { 4099 final int id = mID; 4100 return root.findViewByPredicate(new Predicate<View>() { 4101 @Override 4102 public boolean apply(View t) { 4103 return t.mNextFocusForwardId == id; 4104 } 4105 }); 4106 } 4107 } 4108 return null; 4109 } 4110 4111 private static View findViewShouldExist(View root, int childViewId) { 4112 View result = root.findViewById(childViewId); 4113 if (result == null) { 4114 Log.w(VIEW_LOG_TAG, "couldn't find next focus view specified " 4115 + "by user for id " + childViewId); 4116 } 4117 return result; 4118 } 4119 4120 /** 4121 * Find and return all focusable views that are descendants of this view, 4122 * possibly including this view if it is focusable itself. 4123 * 4124 * @param direction The direction of the focus 4125 * @return A list of focusable views 4126 */ 4127 public ArrayList<View> getFocusables(int direction) { 4128 ArrayList<View> result = new ArrayList<View>(24); 4129 addFocusables(result, direction); 4130 return result; 4131 } 4132 4133 /** 4134 * Add any focusable views that are descendants of this view (possibly 4135 * including this view if it is focusable itself) to views. If we are in touch mode, 4136 * only add views that are also focusable in touch mode. 4137 * 4138 * @param views Focusable views found so far 4139 * @param direction The direction of the focus 4140 */ 4141 public void addFocusables(ArrayList<View> views, int direction) { 4142 addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); 4143 } 4144 4145 /** 4146 * Adds any focusable views that are descendants of this view (possibly 4147 * including this view if it is focusable itself) to views. This method 4148 * adds all focusable views regardless if we are in touch mode or 4149 * only views focusable in touch mode if we are in touch mode depending on 4150 * the focusable mode paramater. 4151 * 4152 * @param views Focusable views found so far or null if all we are interested is 4153 * the number of focusables. 4154 * @param direction The direction of the focus. 4155 * @param focusableMode The type of focusables to be added. 4156 * 4157 * @see #FOCUSABLES_ALL 4158 * @see #FOCUSABLES_TOUCH_MODE 4159 */ 4160 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 4161 if (!isFocusable()) { 4162 return; 4163 } 4164 4165 if ((focusableMode & FOCUSABLES_TOUCH_MODE) == FOCUSABLES_TOUCH_MODE && 4166 isInTouchMode() && !isFocusableInTouchMode()) { 4167 return; 4168 } 4169 4170 if (views != null) { 4171 views.add(this); 4172 } 4173 } 4174 4175 /** 4176 * Find and return all touchable views that are descendants of this view, 4177 * possibly including this view if it is touchable itself. 4178 * 4179 * @return A list of touchable views 4180 */ 4181 public ArrayList<View> getTouchables() { 4182 ArrayList<View> result = new ArrayList<View>(); 4183 addTouchables(result); 4184 return result; 4185 } 4186 4187 /** 4188 * Add any touchable views that are descendants of this view (possibly 4189 * including this view if it is touchable itself) to views. 4190 * 4191 * @param views Touchable views found so far 4192 */ 4193 public void addTouchables(ArrayList<View> views) { 4194 final int viewFlags = mViewFlags; 4195 4196 if (((viewFlags & CLICKABLE) == CLICKABLE || (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) 4197 && (viewFlags & ENABLED_MASK) == ENABLED) { 4198 views.add(this); 4199 } 4200 } 4201 4202 /** 4203 * Call this to try to give focus to a specific view or to one of its 4204 * descendants. 4205 * 4206 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4207 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4208 * while the device is in touch mode. 4209 * 4210 * See also {@link #focusSearch}, which is what you call to say that you 4211 * have focus, and you want your parent to look for the next one. 4212 * 4213 * This is equivalent to calling {@link #requestFocus(int, Rect)} with arguments 4214 * {@link #FOCUS_DOWN} and <code>null</code>. 4215 * 4216 * @return Whether this view or one of its descendants actually took focus. 4217 */ 4218 public final boolean requestFocus() { 4219 return requestFocus(View.FOCUS_DOWN); 4220 } 4221 4222 4223 /** 4224 * Call this to try to give focus to a specific view or to one of its 4225 * descendants and give it a hint about what direction focus is heading. 4226 * 4227 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4228 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4229 * while the device is in touch mode. 4230 * 4231 * See also {@link #focusSearch}, which is what you call to say that you 4232 * have focus, and you want your parent to look for the next one. 4233 * 4234 * This is equivalent to calling {@link #requestFocus(int, Rect)} with 4235 * <code>null</code> set for the previously focused rectangle. 4236 * 4237 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4238 * @return Whether this view or one of its descendants actually took focus. 4239 */ 4240 public final boolean requestFocus(int direction) { 4241 return requestFocus(direction, null); 4242 } 4243 4244 /** 4245 * Call this to try to give focus to a specific view or to one of its descendants 4246 * and give it hints about the direction and a specific rectangle that the focus 4247 * is coming from. The rectangle can help give larger views a finer grained hint 4248 * about where focus is coming from, and therefore, where to show selection, or 4249 * forward focus change internally. 4250 * 4251 * A view will not actually take focus if it is not focusable ({@link #isFocusable} returns false), 4252 * or if it is focusable and it is not focusable in touch mode ({@link #isFocusableInTouchMode}) 4253 * while the device is in touch mode. 4254 * 4255 * A View will not take focus if it is not visible. 4256 * 4257 * A View will not take focus if one of its parents has {@link android.view.ViewGroup#getDescendantFocusability()} 4258 * equal to {@link ViewGroup#FOCUS_BLOCK_DESCENDANTS}. 4259 * 4260 * See also {@link #focusSearch}, which is what you call to say that you 4261 * have focus, and you want your parent to look for the next one. 4262 * 4263 * You may wish to override this method if your custom {@link View} has an internal 4264 * {@link View} that it wishes to forward the request to. 4265 * 4266 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 4267 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 4268 * to give a finer grained hint about where focus is coming from. May be null 4269 * if there is no hint. 4270 * @return Whether this view or one of its descendants actually took focus. 4271 */ 4272 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 4273 // need to be focusable 4274 if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE || 4275 (mViewFlags & VISIBILITY_MASK) != VISIBLE) { 4276 return false; 4277 } 4278 4279 // need to be focusable in touch mode if in touch mode 4280 if (isInTouchMode() && 4281 (FOCUSABLE_IN_TOUCH_MODE != (mViewFlags & FOCUSABLE_IN_TOUCH_MODE))) { 4282 return false; 4283 } 4284 4285 // need to not have any parents blocking us 4286 if (hasAncestorThatBlocksDescendantFocus()) { 4287 return false; 4288 } 4289 4290 handleFocusGainInternal(direction, previouslyFocusedRect); 4291 return true; 4292 } 4293 4294 /** Gets the ViewRoot, or null if not attached. */ 4295 /*package*/ ViewRoot getViewRoot() { 4296 View root = getRootView(); 4297 return root != null ? (ViewRoot)root.getParent() : null; 4298 } 4299 4300 /** 4301 * Call this to try to give focus to a specific view or to one of its descendants. This is a 4302 * special variant of {@link #requestFocus() } that will allow views that are not focuable in 4303 * touch mode to request focus when they are touched. 4304 * 4305 * @return Whether this view or one of its descendants actually took focus. 4306 * 4307 * @see #isInTouchMode() 4308 * 4309 */ 4310 public final boolean requestFocusFromTouch() { 4311 // Leave touch mode if we need to 4312 if (isInTouchMode()) { 4313 ViewRoot viewRoot = getViewRoot(); 4314 if (viewRoot != null) { 4315 viewRoot.ensureTouchMode(false); 4316 } 4317 } 4318 return requestFocus(View.FOCUS_DOWN); 4319 } 4320 4321 /** 4322 * @return Whether any ancestor of this view blocks descendant focus. 4323 */ 4324 private boolean hasAncestorThatBlocksDescendantFocus() { 4325 ViewParent ancestor = mParent; 4326 while (ancestor instanceof ViewGroup) { 4327 final ViewGroup vgAncestor = (ViewGroup) ancestor; 4328 if (vgAncestor.getDescendantFocusability() == ViewGroup.FOCUS_BLOCK_DESCENDANTS) { 4329 return true; 4330 } else { 4331 ancestor = vgAncestor.getParent(); 4332 } 4333 } 4334 return false; 4335 } 4336 4337 /** 4338 * @hide 4339 */ 4340 public void dispatchStartTemporaryDetach() { 4341 onStartTemporaryDetach(); 4342 } 4343 4344 /** 4345 * This is called when a container is going to temporarily detach a child, with 4346 * {@link ViewGroup#detachViewFromParent(View) ViewGroup.detachViewFromParent}. 4347 * It will either be followed by {@link #onFinishTemporaryDetach()} or 4348 * {@link #onDetachedFromWindow()} when the container is done. 4349 */ 4350 public void onStartTemporaryDetach() { 4351 removeUnsetPressCallback(); 4352 mPrivateFlags |= CANCEL_NEXT_UP_EVENT; 4353 } 4354 4355 /** 4356 * @hide 4357 */ 4358 public void dispatchFinishTemporaryDetach() { 4359 onFinishTemporaryDetach(); 4360 } 4361 4362 /** 4363 * Called after {@link #onStartTemporaryDetach} when the container is done 4364 * changing the view. 4365 */ 4366 public void onFinishTemporaryDetach() { 4367 } 4368 4369 /** 4370 * capture information of this view for later analysis: developement only 4371 * check dynamic switch to make sure we only dump view 4372 * when ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW) is set 4373 */ 4374 private static void captureViewInfo(String subTag, View v) { 4375 if (v == null || SystemProperties.getInt(ViewDebug.SYSTEM_PROPERTY_CAPTURE_VIEW, 0) == 0) { 4376 return; 4377 } 4378 ViewDebug.dumpCapturedView(subTag, v); 4379 } 4380 4381 /** 4382 * Return the global {@link KeyEvent.DispatcherState KeyEvent.DispatcherState} 4383 * for this view's window. Returns null if the view is not currently attached 4384 * to the window. Normally you will not need to use this directly, but 4385 * just use the standard high-level event callbacks like {@link #onKeyDown}. 4386 */ 4387 public KeyEvent.DispatcherState getKeyDispatcherState() { 4388 return mAttachInfo != null ? mAttachInfo.mKeyDispatchState : null; 4389 } 4390 4391 /** 4392 * Dispatch a key event before it is processed by any input method 4393 * associated with the view hierarchy. This can be used to intercept 4394 * key events in special situations before the IME consumes them; a 4395 * typical example would be handling the BACK key to update the application's 4396 * UI instead of allowing the IME to see it and close itself. 4397 * 4398 * @param event The key event to be dispatched. 4399 * @return True if the event was handled, false otherwise. 4400 */ 4401 public boolean dispatchKeyEventPreIme(KeyEvent event) { 4402 return onKeyPreIme(event.getKeyCode(), event); 4403 } 4404 4405 /** 4406 * Dispatch a key event to the next view on the focus path. This path runs 4407 * from the top of the view tree down to the currently focused view. If this 4408 * view has focus, it will dispatch to itself. Otherwise it will dispatch 4409 * the next node down the focus path. This method also fires any key 4410 * listeners. 4411 * 4412 * @param event The key event to be dispatched. 4413 * @return True if the event was handled, false otherwise. 4414 */ 4415 public boolean dispatchKeyEvent(KeyEvent event) { 4416 // If any attached key listener a first crack at the event. 4417 4418 //noinspection SimplifiableIfStatement,deprecation 4419 if (android.util.Config.LOGV) { 4420 captureViewInfo("captureViewKeyEvent", this); 4421 } 4422 4423 //noinspection SimplifiableIfStatement 4424 if (mOnKeyListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 4425 && mOnKeyListener.onKey(this, event.getKeyCode(), event)) { 4426 return true; 4427 } 4428 4429 return event.dispatch(this, mAttachInfo != null 4430 ? mAttachInfo.mKeyDispatchState : null, this); 4431 } 4432 4433 /** 4434 * Dispatches a key shortcut event. 4435 * 4436 * @param event The key event to be dispatched. 4437 * @return True if the event was handled by the view, false otherwise. 4438 */ 4439 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 4440 return onKeyShortcut(event.getKeyCode(), event); 4441 } 4442 4443 /** 4444 * Pass the touch screen motion event down to the target view, or this 4445 * view if it is the target. 4446 * 4447 * @param event The motion event to be dispatched. 4448 * @return True if the event was handled by the view, false otherwise. 4449 */ 4450 public boolean dispatchTouchEvent(MotionEvent event) { 4451 if (!onFilterTouchEventForSecurity(event)) { 4452 return false; 4453 } 4454 4455 //noinspection SimplifiableIfStatement 4456 if (mOnTouchListener != null && (mViewFlags & ENABLED_MASK) == ENABLED && 4457 mOnTouchListener.onTouch(this, event)) { 4458 return true; 4459 } 4460 return onTouchEvent(event); 4461 } 4462 4463 /** 4464 * Filter the touch event to apply security policies. 4465 * 4466 * @param event The motion event to be filtered. 4467 * @return True if the event should be dispatched, false if the event should be dropped. 4468 * 4469 * @see #getFilterTouchesWhenObscured 4470 */ 4471 public boolean onFilterTouchEventForSecurity(MotionEvent event) { 4472 //noinspection RedundantIfStatement 4473 if ((mViewFlags & FILTER_TOUCHES_WHEN_OBSCURED) != 0 4474 && (event.getFlags() & MotionEvent.FLAG_WINDOW_IS_OBSCURED) != 0) { 4475 // Window is obscured, drop this touch. 4476 return false; 4477 } 4478 return true; 4479 } 4480 4481 /** 4482 * Pass a trackball motion event down to the focused view. 4483 * 4484 * @param event The motion event to be dispatched. 4485 * @return True if the event was handled by the view, false otherwise. 4486 */ 4487 public boolean dispatchTrackballEvent(MotionEvent event) { 4488 //Log.i("view", "view=" + this + ", " + event.toString()); 4489 return onTrackballEvent(event); 4490 } 4491 4492 /** 4493 * Called when the window containing this view gains or loses window focus. 4494 * ViewGroups should override to route to their children. 4495 * 4496 * @param hasFocus True if the window containing this view now has focus, 4497 * false otherwise. 4498 */ 4499 public void dispatchWindowFocusChanged(boolean hasFocus) { 4500 onWindowFocusChanged(hasFocus); 4501 } 4502 4503 /** 4504 * Called when the window containing this view gains or loses focus. Note 4505 * that this is separate from view focus: to receive key events, both 4506 * your view and its window must have focus. If a window is displayed 4507 * on top of yours that takes input focus, then your own window will lose 4508 * focus but the view focus will remain unchanged. 4509 * 4510 * @param hasWindowFocus True if the window containing this view now has 4511 * focus, false otherwise. 4512 */ 4513 public void onWindowFocusChanged(boolean hasWindowFocus) { 4514 InputMethodManager imm = InputMethodManager.peekInstance(); 4515 if (!hasWindowFocus) { 4516 if (isPressed()) { 4517 setPressed(false); 4518 } 4519 if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4520 imm.focusOut(this); 4521 } 4522 removeLongPressCallback(); 4523 removeTapCallback(); 4524 onFocusLost(); 4525 } else if (imm != null && (mPrivateFlags & FOCUSED) != 0) { 4526 imm.focusIn(this); 4527 } 4528 refreshDrawableState(); 4529 } 4530 4531 /** 4532 * Returns true if this view is in a window that currently has window focus. 4533 * Note that this is not the same as the view itself having focus. 4534 * 4535 * @return True if this view is in a window that currently has window focus. 4536 */ 4537 public boolean hasWindowFocus() { 4538 return mAttachInfo != null && mAttachInfo.mHasWindowFocus; 4539 } 4540 4541 /** 4542 * Dispatch a view visibility change down the view hierarchy. 4543 * ViewGroups should override to route to their children. 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 dispatchVisibilityChanged(View changedView, int visibility) { 4550 onVisibilityChanged(changedView, visibility); 4551 } 4552 4553 /** 4554 * Called when the visibility of the view or an ancestor of the view is changed. 4555 * @param changedView The view whose visibility changed. Could be 'this' or 4556 * an ancestor view. 4557 * @param visibility The new visibility of changedView: {@link #VISIBLE}, 4558 * {@link #INVISIBLE} or {@link #GONE}. 4559 */ 4560 protected void onVisibilityChanged(View changedView, int visibility) { 4561 if (visibility == VISIBLE) { 4562 if (mAttachInfo != null) { 4563 initialAwakenScrollBars(); 4564 } else { 4565 mPrivateFlags |= AWAKEN_SCROLL_BARS_ON_ATTACH; 4566 } 4567 } 4568 } 4569 4570 /** 4571 * Dispatch a hint about whether this view is displayed. For instance, when 4572 * a View moves out of the screen, it might receives a display hint indicating 4573 * the view is not displayed. Applications should not <em>rely</em> on this hint 4574 * as there is no guarantee that they will receive one. 4575 * 4576 * @param hint A hint about whether or not this view is displayed: 4577 * {@link #VISIBLE} or {@link #INVISIBLE}. 4578 */ 4579 public void dispatchDisplayHint(int hint) { 4580 onDisplayHint(hint); 4581 } 4582 4583 /** 4584 * Gives this view a hint about whether is displayed or not. For instance, when 4585 * a View moves out of the screen, it might receives a display hint indicating 4586 * the view is not displayed. Applications should not <em>rely</em> on this hint 4587 * as there is no guarantee that they will receive one. 4588 * 4589 * @param hint A hint about whether or not this view is displayed: 4590 * {@link #VISIBLE} or {@link #INVISIBLE}. 4591 */ 4592 protected void onDisplayHint(int hint) { 4593 } 4594 4595 /** 4596 * Dispatch a window visibility change down the view hierarchy. 4597 * ViewGroups should override to route to their children. 4598 * 4599 * @param visibility The new visibility of the window. 4600 * 4601 * @see #onWindowVisibilityChanged 4602 */ 4603 public void dispatchWindowVisibilityChanged(int visibility) { 4604 onWindowVisibilityChanged(visibility); 4605 } 4606 4607 /** 4608 * Called when the window containing has change its visibility 4609 * (between {@link #GONE}, {@link #INVISIBLE}, and {@link #VISIBLE}). Note 4610 * that this tells you whether or not your window is being made visible 4611 * to the window manager; this does <em>not</em> tell you whether or not 4612 * your window is obscured by other windows on the screen, even if it 4613 * is itself visible. 4614 * 4615 * @param visibility The new visibility of the window. 4616 */ 4617 protected void onWindowVisibilityChanged(int visibility) { 4618 if (visibility == VISIBLE) { 4619 initialAwakenScrollBars(); 4620 } 4621 } 4622 4623 /** 4624 * Returns the current visibility of the window this view is attached to 4625 * (either {@link #GONE}, {@link #INVISIBLE}, or {@link #VISIBLE}). 4626 * 4627 * @return Returns the current visibility of the view's window. 4628 */ 4629 public int getWindowVisibility() { 4630 return mAttachInfo != null ? mAttachInfo.mWindowVisibility : GONE; 4631 } 4632 4633 /** 4634 * Retrieve the overall visible display size in which the window this view is 4635 * attached to has been positioned in. This takes into account screen 4636 * decorations above the window, for both cases where the window itself 4637 * is being position inside of them or the window is being placed under 4638 * then and covered insets are used for the window to position its content 4639 * inside. In effect, this tells you the available area where content can 4640 * be placed and remain visible to users. 4641 * 4642 * <p>This function requires an IPC back to the window manager to retrieve 4643 * the requested information, so should not be used in performance critical 4644 * code like drawing. 4645 * 4646 * @param outRect Filled in with the visible display frame. If the view 4647 * is not attached to a window, this is simply the raw display size. 4648 */ 4649 public void getWindowVisibleDisplayFrame(Rect outRect) { 4650 if (mAttachInfo != null) { 4651 try { 4652 mAttachInfo.mSession.getDisplayFrame(mAttachInfo.mWindow, outRect); 4653 } catch (RemoteException e) { 4654 return; 4655 } 4656 // XXX This is really broken, and probably all needs to be done 4657 // in the window manager, and we need to know more about whether 4658 // we want the area behind or in front of the IME. 4659 final Rect insets = mAttachInfo.mVisibleInsets; 4660 outRect.left += insets.left; 4661 outRect.top += insets.top; 4662 outRect.right -= insets.right; 4663 outRect.bottom -= insets.bottom; 4664 return; 4665 } 4666 Display d = WindowManagerImpl.getDefault().getDefaultDisplay(); 4667 outRect.set(0, 0, d.getWidth(), d.getHeight()); 4668 } 4669 4670 /** 4671 * Dispatch a notification about a resource configuration change down 4672 * the view hierarchy. 4673 * ViewGroups should override to route to their children. 4674 * 4675 * @param newConfig The new resource configuration. 4676 * 4677 * @see #onConfigurationChanged 4678 */ 4679 public void dispatchConfigurationChanged(Configuration newConfig) { 4680 onConfigurationChanged(newConfig); 4681 } 4682 4683 /** 4684 * Called when the current configuration of the resources being used 4685 * by the application have changed. You can use this to decide when 4686 * to reload resources that can changed based on orientation and other 4687 * configuration characterstics. You only need to use this if you are 4688 * not relying on the normal {@link android.app.Activity} mechanism of 4689 * recreating the activity instance upon a configuration change. 4690 * 4691 * @param newConfig The new resource configuration. 4692 */ 4693 protected void onConfigurationChanged(Configuration newConfig) { 4694 } 4695 4696 /** 4697 * Private function to aggregate all per-view attributes in to the view 4698 * root. 4699 */ 4700 void dispatchCollectViewAttributes(int visibility) { 4701 performCollectViewAttributes(visibility); 4702 } 4703 4704 void performCollectViewAttributes(int visibility) { 4705 //noinspection PointlessBitwiseExpression 4706 if (((visibility | mViewFlags) & (VISIBILITY_MASK | KEEP_SCREEN_ON)) 4707 == (VISIBLE | KEEP_SCREEN_ON)) { 4708 mAttachInfo.mKeepScreenOn = true; 4709 } 4710 } 4711 4712 void needGlobalAttributesUpdate(boolean force) { 4713 AttachInfo ai = mAttachInfo; 4714 if (ai != null) { 4715 if (ai.mKeepScreenOn || force) { 4716 ai.mRecomputeGlobalAttributes = true; 4717 } 4718 } 4719 } 4720 4721 /** 4722 * Returns whether the device is currently in touch mode. Touch mode is entered 4723 * once the user begins interacting with the device by touch, and affects various 4724 * things like whether focus is always visible to the user. 4725 * 4726 * @return Whether the device is in touch mode. 4727 */ 4728 @ViewDebug.ExportedProperty 4729 public boolean isInTouchMode() { 4730 if (mAttachInfo != null) { 4731 return mAttachInfo.mInTouchMode; 4732 } else { 4733 return ViewRoot.isInTouchMode(); 4734 } 4735 } 4736 4737 /** 4738 * Returns the context the view is running in, through which it can 4739 * access the current theme, resources, etc. 4740 * 4741 * @return The view's Context. 4742 */ 4743 @ViewDebug.CapturedViewProperty 4744 public final Context getContext() { 4745 return mContext; 4746 } 4747 4748 /** 4749 * Handle a key event before it is processed by any input method 4750 * associated with the view hierarchy. This can be used to intercept 4751 * key events in special situations before the IME consumes them; a 4752 * typical example would be handling the BACK key to update the application's 4753 * UI instead of allowing the IME to see it and close itself. 4754 * 4755 * @param keyCode The value in event.getKeyCode(). 4756 * @param event Description of the key event. 4757 * @return If you handled the event, return true. If you want to allow the 4758 * event to be handled by the next receiver, return false. 4759 */ 4760 public boolean onKeyPreIme(int keyCode, KeyEvent event) { 4761 return false; 4762 } 4763 4764 /** 4765 * Default implementation of {@link KeyEvent.Callback#onKeyDown(int, KeyEvent) 4766 * KeyEvent.Callback.onKeyDown()}: perform press of the view 4767 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or {@link KeyEvent#KEYCODE_ENTER} 4768 * is released, if the view is enabled and clickable. 4769 * 4770 * @param keyCode A key code that represents the button pressed, from 4771 * {@link android.view.KeyEvent}. 4772 * @param event The KeyEvent object that defines the button action. 4773 */ 4774 public boolean onKeyDown(int keyCode, KeyEvent event) { 4775 boolean result = false; 4776 4777 switch (keyCode) { 4778 case KeyEvent.KEYCODE_DPAD_CENTER: 4779 case KeyEvent.KEYCODE_ENTER: { 4780 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4781 return true; 4782 } 4783 // Long clickable items don't necessarily have to be clickable 4784 if (((mViewFlags & CLICKABLE) == CLICKABLE || 4785 (mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) && 4786 (event.getRepeatCount() == 0)) { 4787 setPressed(true); 4788 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 4789 postCheckForLongClick(0); 4790 } 4791 return true; 4792 } 4793 break; 4794 } 4795 } 4796 return result; 4797 } 4798 4799 /** 4800 * Default implementation of {@link KeyEvent.Callback#onKeyLongPress(int, KeyEvent) 4801 * KeyEvent.Callback.onKeyLongPress()}: always returns false (doesn't handle 4802 * the event). 4803 */ 4804 public boolean onKeyLongPress(int keyCode, KeyEvent event) { 4805 return false; 4806 } 4807 4808 /** 4809 * Default implementation of {@link KeyEvent.Callback#onKeyUp(int, KeyEvent) 4810 * KeyEvent.Callback.onKeyUp()}: perform clicking of the view 4811 * when {@link KeyEvent#KEYCODE_DPAD_CENTER} or 4812 * {@link KeyEvent#KEYCODE_ENTER} is released. 4813 * 4814 * @param keyCode A key code that represents the button pressed, from 4815 * {@link android.view.KeyEvent}. 4816 * @param event The KeyEvent object that defines the button action. 4817 */ 4818 public boolean onKeyUp(int keyCode, KeyEvent event) { 4819 boolean result = false; 4820 4821 switch (keyCode) { 4822 case KeyEvent.KEYCODE_DPAD_CENTER: 4823 case KeyEvent.KEYCODE_ENTER: { 4824 if ((mViewFlags & ENABLED_MASK) == DISABLED) { 4825 return true; 4826 } 4827 if ((mViewFlags & CLICKABLE) == CLICKABLE && isPressed()) { 4828 setPressed(false); 4829 4830 if (!mHasPerformedLongPress) { 4831 // This is a tap, so remove the longpress check 4832 removeLongPressCallback(); 4833 4834 result = performClick(); 4835 } 4836 } 4837 break; 4838 } 4839 } 4840 return result; 4841 } 4842 4843 /** 4844 * Default implementation of {@link KeyEvent.Callback#onKeyMultiple(int, int, KeyEvent) 4845 * KeyEvent.Callback.onKeyMultiple()}: always returns false (doesn't handle 4846 * the event). 4847 * 4848 * @param keyCode A key code that represents the button pressed, from 4849 * {@link android.view.KeyEvent}. 4850 * @param repeatCount The number of times the action was made. 4851 * @param event The KeyEvent object that defines the button action. 4852 */ 4853 public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) { 4854 return false; 4855 } 4856 4857 /** 4858 * Called on the focused view when a key shortcut event is not handled. 4859 * Override this method to implement local key shortcuts for the View. 4860 * Key shortcuts can also be implemented by setting the 4861 * {@link MenuItem#setShortcut(char, char) shortcut} property of menu items. 4862 * 4863 * @param keyCode The value in event.getKeyCode(). 4864 * @param event Description of the key event. 4865 * @return If you handled the event, return true. If you want to allow the 4866 * event to be handled by the next receiver, return false. 4867 */ 4868 public boolean onKeyShortcut(int keyCode, KeyEvent event) { 4869 return false; 4870 } 4871 4872 /** 4873 * Check whether the called view is a text editor, in which case it 4874 * would make sense to automatically display a soft input window for 4875 * it. Subclasses should override this if they implement 4876 * {@link #onCreateInputConnection(EditorInfo)} to return true if 4877 * a call on that method would return a non-null InputConnection, and 4878 * they are really a first-class editor that the user would normally 4879 * start typing on when the go into a window containing your view. 4880 * 4881 * <p>The default implementation always returns false. This does 4882 * <em>not</em> mean that its {@link #onCreateInputConnection(EditorInfo)} 4883 * will not be called or the user can not otherwise perform edits on your 4884 * view; it is just a hint to the system that this is not the primary 4885 * purpose of this view. 4886 * 4887 * @return Returns true if this view is a text editor, else false. 4888 */ 4889 public boolean onCheckIsTextEditor() { 4890 return false; 4891 } 4892 4893 /** 4894 * Create a new InputConnection for an InputMethod to interact 4895 * with the view. The default implementation returns null, since it doesn't 4896 * support input methods. You can override this to implement such support. 4897 * This is only needed for views that take focus and text input. 4898 * 4899 * <p>When implementing this, you probably also want to implement 4900 * {@link #onCheckIsTextEditor()} to indicate you will return a 4901 * non-null InputConnection. 4902 * 4903 * @param outAttrs Fill in with attribute information about the connection. 4904 */ 4905 public InputConnection onCreateInputConnection(EditorInfo outAttrs) { 4906 return null; 4907 } 4908 4909 /** 4910 * Called by the {@link android.view.inputmethod.InputMethodManager} 4911 * when a view who is not the current 4912 * input connection target is trying to make a call on the manager. The 4913 * default implementation returns false; you can override this to return 4914 * true for certain views if you are performing InputConnection proxying 4915 * to them. 4916 * @param view The View that is making the InputMethodManager call. 4917 * @return Return true to allow the call, false to reject. 4918 */ 4919 public boolean checkInputConnectionProxy(View view) { 4920 return false; 4921 } 4922 4923 /** 4924 * Show the context menu for this view. It is not safe to hold on to the 4925 * menu after returning from this method. 4926 * 4927 * You should normally not overload this method. Overload 4928 * {@link #onCreateContextMenu(ContextMenu)} or define an 4929 * {@link OnCreateContextMenuListener} to add items to the context menu. 4930 * 4931 * @param menu The context menu to populate 4932 */ 4933 public void createContextMenu(ContextMenu menu) { 4934 ContextMenuInfo menuInfo = getContextMenuInfo(); 4935 4936 // Sets the current menu info so all items added to menu will have 4937 // my extra info set. 4938 ((MenuBuilder)menu).setCurrentMenuInfo(menuInfo); 4939 4940 onCreateContextMenu(menu); 4941 if (mOnCreateContextMenuListener != null) { 4942 mOnCreateContextMenuListener.onCreateContextMenu(menu, this, menuInfo); 4943 } 4944 4945 // Clear the extra information so subsequent items that aren't mine don't 4946 // have my extra info. 4947 ((MenuBuilder)menu).setCurrentMenuInfo(null); 4948 4949 if (mParent != null) { 4950 mParent.createContextMenu(menu); 4951 } 4952 } 4953 4954 /** 4955 * Views should implement this if they have extra information to associate 4956 * with the context menu. The return result is supplied as a parameter to 4957 * the {@link OnCreateContextMenuListener#onCreateContextMenu(ContextMenu, View, ContextMenuInfo)} 4958 * callback. 4959 * 4960 * @return Extra information about the item for which the context menu 4961 * should be shown. This information will vary across different 4962 * subclasses of View. 4963 */ 4964 protected ContextMenuInfo getContextMenuInfo() { 4965 return null; 4966 } 4967 4968 /** 4969 * Views should implement this if the view itself is going to add items to 4970 * the context menu. 4971 * 4972 * @param menu the context menu to populate 4973 */ 4974 protected void onCreateContextMenu(ContextMenu menu) { 4975 } 4976 4977 /** 4978 * Implement this method to handle trackball motion events. The 4979 * <em>relative</em> movement of the trackball since the last event 4980 * can be retrieve with {@link MotionEvent#getX MotionEvent.getX()} and 4981 * {@link MotionEvent#getY MotionEvent.getY()}. These are normalized so 4982 * that a movement of 1 corresponds to the user pressing one DPAD key (so 4983 * they will often be fractional values, representing the more fine-grained 4984 * movement information available from a trackball). 4985 * 4986 * @param event The motion event. 4987 * @return True if the event was handled, false otherwise. 4988 */ 4989 public boolean onTrackballEvent(MotionEvent event) { 4990 return false; 4991 } 4992 4993 /** 4994 * Implement this method to handle touch screen motion events. 4995 * 4996 * @param event The motion event. 4997 * @return True if the event was handled, false otherwise. 4998 */ 4999 public boolean onTouchEvent(MotionEvent event) { 5000 final int viewFlags = mViewFlags; 5001 5002 if ((viewFlags & ENABLED_MASK) == DISABLED) { 5003 // A disabled view that is clickable still consumes the touch 5004 // events, it just doesn't respond to them. 5005 return (((viewFlags & CLICKABLE) == CLICKABLE || 5006 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)); 5007 } 5008 5009 if (mTouchDelegate != null) { 5010 if (mTouchDelegate.onTouchEvent(event)) { 5011 return true; 5012 } 5013 } 5014 5015 if (((viewFlags & CLICKABLE) == CLICKABLE || 5016 (viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE)) { 5017 switch (event.getAction()) { 5018 case MotionEvent.ACTION_UP: 5019 boolean prepressed = (mPrivateFlags & PREPRESSED) != 0; 5020 if ((mPrivateFlags & PRESSED) != 0 || prepressed) { 5021 // take focus if we don't have it already and we should in 5022 // touch mode. 5023 boolean focusTaken = false; 5024 if (isFocusable() && isFocusableInTouchMode() && !isFocused()) { 5025 focusTaken = requestFocus(); 5026 } 5027 5028 if (!mHasPerformedLongPress) { 5029 // This is a tap, so remove the longpress check 5030 removeLongPressCallback(); 5031 5032 // Only perform take click actions if we were in the pressed state 5033 if (!focusTaken) { 5034 // Use a Runnable and post this rather than calling 5035 // performClick directly. This lets other visual state 5036 // of the view update before click actions start. 5037 if (mPerformClick == null) { 5038 mPerformClick = new PerformClick(); 5039 } 5040 if (!post(mPerformClick)) { 5041 performClick(); 5042 } 5043 } 5044 } 5045 5046 if (mUnsetPressedState == null) { 5047 mUnsetPressedState = new UnsetPressedState(); 5048 } 5049 5050 if (prepressed) { 5051 mPrivateFlags |= PRESSED; 5052 refreshDrawableState(); 5053 postDelayed(mUnsetPressedState, 5054 ViewConfiguration.getPressedStateDuration()); 5055 } else if (!post(mUnsetPressedState)) { 5056 // If the post failed, unpress right now 5057 mUnsetPressedState.run(); 5058 } 5059 removeTapCallback(); 5060 } 5061 break; 5062 5063 case MotionEvent.ACTION_DOWN: 5064 if (mPendingCheckForTap == null) { 5065 mPendingCheckForTap = new CheckForTap(); 5066 } 5067 mPrivateFlags |= PREPRESSED; 5068 mHasPerformedLongPress = false; 5069 postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout()); 5070 break; 5071 5072 case MotionEvent.ACTION_CANCEL: 5073 mPrivateFlags &= ~PRESSED; 5074 refreshDrawableState(); 5075 removeTapCallback(); 5076 break; 5077 5078 case MotionEvent.ACTION_MOVE: 5079 final int x = (int) event.getX(); 5080 final int y = (int) event.getY(); 5081 5082 // Be lenient about moving outside of buttons 5083 if (!pointInView(x, y, mTouchSlop)) { 5084 // Outside button 5085 removeTapCallback(); 5086 if ((mPrivateFlags & PRESSED) != 0) { 5087 // Remove any future long press/tap checks 5088 removeLongPressCallback(); 5089 5090 // Need to switch from pressed to not pressed 5091 mPrivateFlags &= ~PRESSED; 5092 refreshDrawableState(); 5093 } 5094 } 5095 break; 5096 } 5097 return true; 5098 } 5099 5100 return false; 5101 } 5102 5103 /** 5104 * Remove the longpress detection timer. 5105 */ 5106 private void removeLongPressCallback() { 5107 if (mPendingCheckForLongPress != null) { 5108 removeCallbacks(mPendingCheckForLongPress); 5109 } 5110 } 5111 5112 /** 5113 * Remove the prepress detection timer. 5114 */ 5115 private void removeUnsetPressCallback() { 5116 if ((mPrivateFlags & PRESSED) != 0 && mUnsetPressedState != null) { 5117 setPressed(false); 5118 removeCallbacks(mUnsetPressedState); 5119 } 5120 } 5121 5122 /** 5123 * Remove the tap detection timer. 5124 */ 5125 private void removeTapCallback() { 5126 if (mPendingCheckForTap != null) { 5127 mPrivateFlags &= ~PREPRESSED; 5128 removeCallbacks(mPendingCheckForTap); 5129 } 5130 } 5131 5132 /** 5133 * Cancels a pending long press. Your subclass can use this if you 5134 * want the context menu to come up if the user presses and holds 5135 * at the same place, but you don't want it to come up if they press 5136 * and then move around enough to cause scrolling. 5137 */ 5138 public void cancelLongPress() { 5139 removeLongPressCallback(); 5140 5141 /* 5142 * The prepressed state handled by the tap callback is a display 5143 * construct, but the tap callback will post a long press callback 5144 * less its own timeout. Remove it here. 5145 */ 5146 removeTapCallback(); 5147 } 5148 5149 /** 5150 * Sets the TouchDelegate for this View. 5151 */ 5152 public void setTouchDelegate(TouchDelegate delegate) { 5153 mTouchDelegate = delegate; 5154 } 5155 5156 /** 5157 * Gets the TouchDelegate for this View. 5158 */ 5159 public TouchDelegate getTouchDelegate() { 5160 return mTouchDelegate; 5161 } 5162 5163 /** 5164 * Set flags controlling behavior of this view. 5165 * 5166 * @param flags Constant indicating the value which should be set 5167 * @param mask Constant indicating the bit range that should be changed 5168 */ 5169 void setFlags(int flags, int mask) { 5170 int old = mViewFlags; 5171 mViewFlags = (mViewFlags & ~mask) | (flags & mask); 5172 5173 int changed = mViewFlags ^ old; 5174 if (changed == 0) { 5175 return; 5176 } 5177 int privateFlags = mPrivateFlags; 5178 5179 /* Check if the FOCUSABLE bit has changed */ 5180 if (((changed & FOCUSABLE_MASK) != 0) && 5181 ((privateFlags & HAS_BOUNDS) !=0)) { 5182 if (((old & FOCUSABLE_MASK) == FOCUSABLE) 5183 && ((privateFlags & FOCUSED) != 0)) { 5184 /* Give up focus if we are no longer focusable */ 5185 clearFocus(); 5186 } else if (((old & FOCUSABLE_MASK) == NOT_FOCUSABLE) 5187 && ((privateFlags & FOCUSED) == 0)) { 5188 /* 5189 * Tell the view system that we are now available to take focus 5190 * if no one else already has it. 5191 */ 5192 if (mParent != null) mParent.focusableViewAvailable(this); 5193 } 5194 } 5195 5196 if ((flags & VISIBILITY_MASK) == VISIBLE) { 5197 if ((changed & VISIBILITY_MASK) != 0) { 5198 /* 5199 * If this view is becoming visible, set the DRAWN flag so that 5200 * the next invalidate() will not be skipped. 5201 */ 5202 mPrivateFlags |= DRAWN; 5203 5204 needGlobalAttributesUpdate(true); 5205 5206 // a view becoming visible is worth notifying the parent 5207 // about in case nothing has focus. even if this specific view 5208 // isn't focusable, it may contain something that is, so let 5209 // the root view try to give this focus if nothing else does. 5210 if ((mParent != null) && (mBottom > mTop) && (mRight > mLeft)) { 5211 mParent.focusableViewAvailable(this); 5212 } 5213 } 5214 } 5215 5216 /* Check if the GONE bit has changed */ 5217 if ((changed & GONE) != 0) { 5218 needGlobalAttributesUpdate(false); 5219 requestLayout(); 5220 invalidate(); 5221 5222 if (((mViewFlags & VISIBILITY_MASK) == GONE)) { 5223 if (hasFocus()) clearFocus(); 5224 destroyDrawingCache(); 5225 } 5226 if (mAttachInfo != null) { 5227 mAttachInfo.mViewVisibilityChanged = true; 5228 } 5229 } 5230 5231 /* Check if the VISIBLE bit has changed */ 5232 if ((changed & INVISIBLE) != 0) { 5233 needGlobalAttributesUpdate(false); 5234 invalidate(); 5235 5236 if (((mViewFlags & VISIBILITY_MASK) == INVISIBLE) && hasFocus()) { 5237 // root view becoming invisible shouldn't clear focus 5238 if (getRootView() != this) { 5239 clearFocus(); 5240 } 5241 } 5242 if (mAttachInfo != null) { 5243 mAttachInfo.mViewVisibilityChanged = true; 5244 } 5245 } 5246 5247 if ((changed & VISIBILITY_MASK) != 0) { 5248 if (mParent instanceof ViewGroup) { 5249 ((ViewGroup)mParent).onChildVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5250 } 5251 dispatchVisibilityChanged(this, (flags & VISIBILITY_MASK)); 5252 } 5253 5254 if ((changed & WILL_NOT_CACHE_DRAWING) != 0) { 5255 destroyDrawingCache(); 5256 } 5257 5258 if ((changed & DRAWING_CACHE_ENABLED) != 0) { 5259 destroyDrawingCache(); 5260 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5261 } 5262 5263 if ((changed & DRAWING_CACHE_QUALITY_MASK) != 0) { 5264 destroyDrawingCache(); 5265 mPrivateFlags &= ~DRAWING_CACHE_VALID; 5266 } 5267 5268 if ((changed & DRAW_MASK) != 0) { 5269 if ((mViewFlags & WILL_NOT_DRAW) != 0) { 5270 if (mBGDrawable != null) { 5271 mPrivateFlags &= ~SKIP_DRAW; 5272 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 5273 } else { 5274 mPrivateFlags |= SKIP_DRAW; 5275 } 5276 } else { 5277 mPrivateFlags &= ~SKIP_DRAW; 5278 } 5279 requestLayout(); 5280 invalidate(); 5281 } 5282 5283 if ((changed & KEEP_SCREEN_ON) != 0) { 5284 if (mParent != null) { 5285 mParent.recomputeViewAttributes(this); 5286 } 5287 } 5288 } 5289 5290 /** 5291 * Change the view's z order in the tree, so it's on top of other sibling 5292 * views 5293 */ 5294 public void bringToFront() { 5295 if (mParent != null) { 5296 mParent.bringChildToFront(this); 5297 } 5298 } 5299 5300 /** 5301 * This is called in response to an internal scroll in this view (i.e., the 5302 * view scrolled its own contents). This is typically as a result of 5303 * {@link #scrollBy(int, int)} or {@link #scrollTo(int, int)} having been 5304 * called. 5305 * 5306 * @param l Current horizontal scroll origin. 5307 * @param t Current vertical scroll origin. 5308 * @param oldl Previous horizontal scroll origin. 5309 * @param oldt Previous vertical scroll origin. 5310 */ 5311 protected void onScrollChanged(int l, int t, int oldl, int oldt) { 5312 mBackgroundSizeChanged = true; 5313 5314 final AttachInfo ai = mAttachInfo; 5315 if (ai != null) { 5316 ai.mViewScrollChanged = true; 5317 } 5318 } 5319 5320 /** 5321 * Interface definition for a callback to be invoked when the layout bounds of a view 5322 * changes due to layout processing. 5323 */ 5324 public interface OnLayoutChangeListener { 5325 /** 5326 * Called when the focus state of a view has changed. 5327 * 5328 * @param v The view whose state has changed. 5329 * @param left The new value of the view's left property. 5330 * @param top The new value of the view's top property. 5331 * @param right The new value of the view's right property. 5332 * @param bottom The new value of the view's bottom property. 5333 * @param oldLeft The previous value of the view's left property. 5334 * @param oldTop The previous value of the view's top property. 5335 * @param oldRight The previous value of the view's right property. 5336 * @param oldBottom The previous value of the view's bottom property. 5337 */ 5338 void onLayoutChange(View v, int left, int top, int right, int bottom, 5339 int oldLeft, int oldTop, int oldRight, int oldBottom); 5340 } 5341 5342 /** 5343 * This is called during layout when the size of this view has changed. If 5344 * you were just added to the view hierarchy, you're called with the old 5345 * values of 0. 5346 * 5347 * @param w Current width of this view. 5348 * @param h Current height of this view. 5349 * @param oldw Old width of this view. 5350 * @param oldh Old height of this view. 5351 */ 5352 protected void onSizeChanged(int w, int h, int oldw, int oldh) { 5353 } 5354 5355 /** 5356 * Called by draw to draw the child views. This may be overridden 5357 * by derived classes to gain control just before its children are drawn 5358 * (but after its own view has been drawn). 5359 * @param canvas the canvas on which to draw the view 5360 */ 5361 protected void dispatchDraw(Canvas canvas) { 5362 } 5363 5364 /** 5365 * Gets the parent of this view. Note that the parent is a 5366 * ViewParent and not necessarily a View. 5367 * 5368 * @return Parent of this view. 5369 */ 5370 public final ViewParent getParent() { 5371 return mParent; 5372 } 5373 5374 /** 5375 * Return the scrolled left position of this view. This is the left edge of 5376 * the displayed part of your view. You do not need to draw any pixels 5377 * farther left, since those are outside of the frame of your view on 5378 * screen. 5379 * 5380 * @return The left edge of the displayed part of your view, in pixels. 5381 */ 5382 public final int getScrollX() { 5383 return mScrollX; 5384 } 5385 5386 /** 5387 * Return the scrolled top position of this view. This is the top edge of 5388 * the displayed part of your view. You do not need to draw any pixels above 5389 * it, since those are outside of the frame of your view on screen. 5390 * 5391 * @return The top edge of the displayed part of your view, in pixels. 5392 */ 5393 public final int getScrollY() { 5394 return mScrollY; 5395 } 5396 5397 /** 5398 * Return the width of the your view. 5399 * 5400 * @return The width of your view, in pixels. 5401 */ 5402 @ViewDebug.ExportedProperty(category = "layout") 5403 public final int getWidth() { 5404 return mRight - mLeft; 5405 } 5406 5407 /** 5408 * Return the height of your view. 5409 * 5410 * @return The height of your view, in pixels. 5411 */ 5412 @ViewDebug.ExportedProperty(category = "layout") 5413 public final int getHeight() { 5414 return mBottom - mTop; 5415 } 5416 5417 /** 5418 * Return the visible drawing bounds of your view. Fills in the output 5419 * rectangle with the values from getScrollX(), getScrollY(), 5420 * getWidth(), and getHeight(). 5421 * 5422 * @param outRect The (scrolled) drawing bounds of the view. 5423 */ 5424 public void getDrawingRect(Rect outRect) { 5425 outRect.left = mScrollX; 5426 outRect.top = mScrollY; 5427 outRect.right = mScrollX + (mRight - mLeft); 5428 outRect.bottom = mScrollY + (mBottom - mTop); 5429 } 5430 5431 /** 5432 * Like {@link #getMeasuredWidthAndState()}, but only returns the 5433 * raw width component (that is the result is masked by 5434 * {@link #MEASURED_SIZE_MASK}). 5435 * 5436 * @return The raw measured width of this view. 5437 */ 5438 public final int getMeasuredWidth() { 5439 return mMeasuredWidth & MEASURED_SIZE_MASK; 5440 } 5441 5442 /** 5443 * Return the full width measurement information for this view as computed 5444 * by the most recent call to {@link #measure}. This result is a bit mask 5445 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5446 * This should be used during measurement and layout calculations only. Use 5447 * {@link #getWidth()} to see how wide a view is after layout. 5448 * 5449 * @return The measured width of this view as a bit mask. 5450 */ 5451 public final int getMeasuredWidthAndState() { 5452 return mMeasuredWidth; 5453 } 5454 5455 /** 5456 * Like {@link #getMeasuredHeightAndState()}, but only returns the 5457 * raw width component (that is the result is masked by 5458 * {@link #MEASURED_SIZE_MASK}). 5459 * 5460 * @return The raw measured height of this view. 5461 */ 5462 public final int getMeasuredHeight() { 5463 return mMeasuredHeight & MEASURED_SIZE_MASK; 5464 } 5465 5466 /** 5467 * Return the full height measurement information for this view as computed 5468 * by the most recent call to {@link #measure}. This result is a bit mask 5469 * as defined by {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 5470 * This should be used during measurement and layout calculations only. Use 5471 * {@link #getHeight()} to see how wide a view is after layout. 5472 * 5473 * @return The measured width of this view as a bit mask. 5474 */ 5475 public final int getMeasuredHeightAndState() { 5476 return mMeasuredHeight; 5477 } 5478 5479 /** 5480 * Return only the state bits of {@link #getMeasuredWidthAndState()} 5481 * and {@link #getMeasuredHeightAndState()}, combined into one integer. 5482 * The width component is in the regular bits {@link #MEASURED_STATE_MASK} 5483 * and the height component is at the shifted bits 5484 * {@link #MEASURED_HEIGHT_STATE_SHIFT}>>{@link #MEASURED_STATE_MASK}. 5485 */ 5486 public final int getMeasuredState() { 5487 return (mMeasuredWidth&MEASURED_STATE_MASK) 5488 | ((mMeasuredHeight>>MEASURED_HEIGHT_STATE_SHIFT) 5489 & (MEASURED_STATE_MASK>>MEASURED_HEIGHT_STATE_SHIFT)); 5490 } 5491 5492 /** 5493 * The transform matrix of this view, which is calculated based on the current 5494 * roation, scale, and pivot properties. 5495 * 5496 * @see #getRotation() 5497 * @see #getScaleX() 5498 * @see #getScaleY() 5499 * @see #getPivotX() 5500 * @see #getPivotY() 5501 * @return The current transform matrix for the view 5502 */ 5503 public Matrix getMatrix() { 5504 updateMatrix(); 5505 return mMatrix; 5506 } 5507 5508 /** 5509 * Utility function to determine if the value is far enough away from zero to be 5510 * considered non-zero. 5511 * @param value A floating point value to check for zero-ness 5512 * @return whether the passed-in value is far enough away from zero to be considered non-zero 5513 */ 5514 private static boolean nonzero(float value) { 5515 return (value < -NONZERO_EPSILON || value > NONZERO_EPSILON); 5516 } 5517 5518 /** 5519 * Returns true if the transform matrix is the identity matrix. 5520 * Recomputes the matrix if necessary. 5521 * 5522 * @return True if the transform matrix is the identity matrix, false otherwise. 5523 */ 5524 final boolean hasIdentityMatrix() { 5525 updateMatrix(); 5526 return mMatrixIsIdentity; 5527 } 5528 5529 /** 5530 * Recomputes the transform matrix if necessary. 5531 */ 5532 private void updateMatrix() { 5533 if (mMatrixDirty) { 5534 // transform-related properties have changed since the last time someone 5535 // asked for the matrix; recalculate it with the current values 5536 5537 // Figure out if we need to update the pivot point 5538 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5539 if ((mRight - mLeft) != mPrevWidth || (mBottom - mTop) != mPrevHeight) { 5540 mPrevWidth = mRight - mLeft; 5541 mPrevHeight = mBottom - mTop; 5542 mPivotX = mPrevWidth / 2f; 5543 mPivotY = mPrevHeight / 2f; 5544 } 5545 } 5546 mMatrix.reset(); 5547 if (!nonzero(mRotationX) && !nonzero(mRotationY)) { 5548 mMatrix.setTranslate(mTranslationX, mTranslationY); 5549 mMatrix.preRotate(mRotation, mPivotX, mPivotY); 5550 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5551 } else { 5552 if (mCamera == null) { 5553 mCamera = new Camera(); 5554 matrix3D = new Matrix(); 5555 } 5556 mCamera.save(); 5557 mMatrix.preScale(mScaleX, mScaleY, mPivotX, mPivotY); 5558 mCamera.rotateX(mRotationX); 5559 mCamera.rotateY(mRotationY); 5560 mCamera.rotateZ(-mRotation); 5561 mCamera.getMatrix(matrix3D); 5562 matrix3D.preTranslate(-mPivotX, -mPivotY); 5563 matrix3D.postTranslate(mPivotX + mTranslationX, mPivotY + mTranslationY); 5564 mMatrix.postConcat(matrix3D); 5565 mCamera.restore(); 5566 } 5567 mMatrixDirty = false; 5568 mMatrixIsIdentity = mMatrix.isIdentity(); 5569 mInverseMatrixDirty = true; 5570 } 5571 } 5572 5573 /** 5574 * Utility method to retrieve the inverse of the current mMatrix property. 5575 * We cache the matrix to avoid recalculating it when transform properties 5576 * have not changed. 5577 * 5578 * @return The inverse of the current matrix of this view. 5579 */ 5580 final Matrix getInverseMatrix() { 5581 updateMatrix(); 5582 if (mInverseMatrixDirty) { 5583 if (mInverseMatrix == null) { 5584 mInverseMatrix = new Matrix(); 5585 } 5586 mMatrix.invert(mInverseMatrix); 5587 mInverseMatrixDirty = false; 5588 } 5589 return mInverseMatrix; 5590 } 5591 5592 /** 5593 * The degrees that the view is rotated around the pivot point. 5594 * 5595 * @see #getPivotX() 5596 * @see #getPivotY() 5597 * @return The degrees of rotation. 5598 */ 5599 public float getRotation() { 5600 return mRotation; 5601 } 5602 5603 /** 5604 * Sets the degrees that the view is rotated around the pivot point. Increasing values 5605 * result in clockwise rotation. 5606 * 5607 * @param rotation The degrees of rotation. 5608 * @see #getPivotX() 5609 * @see #getPivotY() 5610 * 5611 * @attr ref android.R.styleable#View_rotation 5612 */ 5613 public void setRotation(float rotation) { 5614 if (mRotation != rotation) { 5615 // Double-invalidation is necessary to capture view's old and new areas 5616 invalidate(false); 5617 mRotation = rotation; 5618 mMatrixDirty = true; 5619 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5620 invalidate(false); 5621 } 5622 } 5623 5624 /** 5625 * The degrees that the view is rotated around the vertical axis through the pivot point. 5626 * 5627 * @see #getPivotX() 5628 * @see #getPivotY() 5629 * @return The degrees of Y rotation. 5630 */ 5631 public float getRotationY() { 5632 return mRotationY; 5633 } 5634 5635 /** 5636 * Sets the degrees that the view is rotated around the vertical axis through the pivot point. 5637 * Increasing values result in counter-clockwise rotation from the viewpoint of looking 5638 * down the y axis. 5639 * 5640 * @param rotationY The degrees of Y rotation. 5641 * @see #getPivotX() 5642 * @see #getPivotY() 5643 * 5644 * @attr ref android.R.styleable#View_rotationY 5645 */ 5646 public void setRotationY(float rotationY) { 5647 if (mRotationY != rotationY) { 5648 // Double-invalidation is necessary to capture view's old and new areas 5649 invalidate(false); 5650 mRotationY = rotationY; 5651 mMatrixDirty = true; 5652 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5653 invalidate(false); 5654 } 5655 } 5656 5657 /** 5658 * The degrees that the view is rotated around the horizontal axis through the pivot point. 5659 * 5660 * @see #getPivotX() 5661 * @see #getPivotY() 5662 * @return The degrees of X rotation. 5663 */ 5664 public float getRotationX() { 5665 return mRotationX; 5666 } 5667 5668 /** 5669 * Sets the degrees that the view is rotated around the horizontal axis through the pivot point. 5670 * Increasing values result in clockwise rotation from the viewpoint of looking down the 5671 * x axis. 5672 * 5673 * @param rotationX The degrees of X rotation. 5674 * @see #getPivotX() 5675 * @see #getPivotY() 5676 * 5677 * @attr ref android.R.styleable#View_rotationX 5678 */ 5679 public void setRotationX(float rotationX) { 5680 if (mRotationX != rotationX) { 5681 // Double-invalidation is necessary to capture view's old and new areas 5682 invalidate(false); 5683 mRotationX = rotationX; 5684 mMatrixDirty = true; 5685 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5686 invalidate(false); 5687 } 5688 } 5689 5690 /** 5691 * The amount that the view is scaled in x around the pivot point, as a proportion of 5692 * the view's unscaled width. A value of 1, the default, means that no scaling is applied. 5693 * 5694 * <p>By default, this is 1.0f. 5695 * 5696 * @see #getPivotX() 5697 * @see #getPivotY() 5698 * @return The scaling factor. 5699 */ 5700 public float getScaleX() { 5701 return mScaleX; 5702 } 5703 5704 /** 5705 * Sets the amount that the view is scaled in x around the pivot point, as a proportion of 5706 * the view's unscaled width. A value of 1 means that no scaling is applied. 5707 * 5708 * @param scaleX The scaling factor. 5709 * @see #getPivotX() 5710 * @see #getPivotY() 5711 * 5712 * @attr ref android.R.styleable#View_scaleX 5713 */ 5714 public void setScaleX(float scaleX) { 5715 if (mScaleX != scaleX) { 5716 // Double-invalidation is necessary to capture view's old and new areas 5717 invalidate(false); 5718 mScaleX = scaleX; 5719 mMatrixDirty = true; 5720 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5721 invalidate(false); 5722 } 5723 } 5724 5725 /** 5726 * The amount that the view is scaled in y around the pivot point, as a proportion of 5727 * the view's unscaled height. A value of 1, the default, means that no scaling is applied. 5728 * 5729 * <p>By default, this is 1.0f. 5730 * 5731 * @see #getPivotX() 5732 * @see #getPivotY() 5733 * @return The scaling factor. 5734 */ 5735 public float getScaleY() { 5736 return mScaleY; 5737 } 5738 5739 /** 5740 * Sets the amount that the view is scaled in Y around the pivot point, as a proportion of 5741 * the view's unscaled width. A value of 1 means that no scaling is applied. 5742 * 5743 * @param scaleY The scaling factor. 5744 * @see #getPivotX() 5745 * @see #getPivotY() 5746 * 5747 * @attr ref android.R.styleable#View_scaleY 5748 */ 5749 public void setScaleY(float scaleY) { 5750 if (mScaleY != scaleY) { 5751 // Double-invalidation is necessary to capture view's old and new areas 5752 invalidate(false); 5753 mScaleY = scaleY; 5754 mMatrixDirty = true; 5755 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5756 invalidate(false); 5757 } 5758 } 5759 5760 /** 5761 * The x location of the point around which the view is {@link #setRotation(float) rotated} 5762 * and {@link #setScaleX(float) scaled}. 5763 * 5764 * @see #getRotation() 5765 * @see #getScaleX() 5766 * @see #getScaleY() 5767 * @see #getPivotY() 5768 * @return The x location of the pivot point. 5769 */ 5770 public float getPivotX() { 5771 return mPivotX; 5772 } 5773 5774 /** 5775 * Sets the x location of the point around which the view is 5776 * {@link #setRotation(float) rotated} and {@link #setScaleX(float) scaled}. 5777 * By default, the pivot point is centered on the object. 5778 * Setting this property disables this behavior and causes the view to use only the 5779 * explicitly set pivotX and pivotY values. 5780 * 5781 * @param pivotX The x location of the pivot point. 5782 * @see #getRotation() 5783 * @see #getScaleX() 5784 * @see #getScaleY() 5785 * @see #getPivotY() 5786 * 5787 * @attr ref android.R.styleable#View_transformPivotX 5788 */ 5789 public void setPivotX(float pivotX) { 5790 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5791 if (mPivotX != pivotX) { 5792 // Double-invalidation is necessary to capture view's old and new areas 5793 invalidate(false); 5794 mPivotX = pivotX; 5795 mMatrixDirty = true; 5796 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5797 invalidate(false); 5798 } 5799 } 5800 5801 /** 5802 * The y location of the point around which the view is {@link #setRotation(float) rotated} 5803 * and {@link #setScaleY(float) scaled}. 5804 * 5805 * @see #getRotation() 5806 * @see #getScaleX() 5807 * @see #getScaleY() 5808 * @see #getPivotY() 5809 * @return The y location of the pivot point. 5810 */ 5811 public float getPivotY() { 5812 return mPivotY; 5813 } 5814 5815 /** 5816 * Sets the y location of the point around which the view is {@link #setRotation(float) rotated} 5817 * and {@link #setScaleY(float) scaled}. By default, the pivot point is centered on the object. 5818 * Setting this property disables this behavior and causes the view to use only the 5819 * explicitly set pivotX and pivotY values. 5820 * 5821 * @param pivotY The y location of the pivot point. 5822 * @see #getRotation() 5823 * @see #getScaleX() 5824 * @see #getScaleY() 5825 * @see #getPivotY() 5826 * 5827 * @attr ref android.R.styleable#View_transformPivotY 5828 */ 5829 public void setPivotY(float pivotY) { 5830 mPrivateFlags |= PIVOT_EXPLICITLY_SET; 5831 if (mPivotY != pivotY) { 5832 // Double-invalidation is necessary to capture view's old and new areas 5833 invalidate(false); 5834 mPivotY = pivotY; 5835 mMatrixDirty = true; 5836 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5837 invalidate(false); 5838 } 5839 } 5840 5841 /** 5842 * 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. 5844 * 5845 * <p>By default this is 1.0f. 5846 * @return The opacity of the view. 5847 */ 5848 public float getAlpha() { 5849 return mAlpha; 5850 } 5851 5852 /** 5853 * <p>Sets the opacity of the view. This is a value from 0 to 1, where 0 means the view is 5854 * completely transparent and 1 means the view is completely opaque.</p> 5855 * 5856 * <p>If this view overrides {@link #onSetAlpha(int)} to return true, then this view is 5857 * responsible for applying the opacity itself. Otherwise, calling this method is 5858 * equivalent to calling {@link #setLayerType(int, android.graphics.Paint)} and 5859 * setting a hardware layer.</p> 5860 * 5861 * @param alpha The opacity of the view. 5862 * 5863 * @see #setLayerType(int, android.graphics.Paint) 5864 * 5865 * @attr ref android.R.styleable#View_alpha 5866 */ 5867 public void setAlpha(float alpha) { 5868 mAlpha = alpha; 5869 if (onSetAlpha((int) (alpha * 255))) { 5870 mPrivateFlags |= ALPHA_SET; 5871 // subclass is handling alpha - don't optimize rendering cache invalidation 5872 invalidate(); 5873 } else { 5874 mPrivateFlags &= ~ALPHA_SET; 5875 invalidate(false); 5876 } 5877 } 5878 5879 /** 5880 * Top position of this view relative to its parent. 5881 * 5882 * @return The top of this view, in pixels. 5883 */ 5884 @ViewDebug.CapturedViewProperty 5885 public final int getTop() { 5886 return mTop; 5887 } 5888 5889 /** 5890 * Sets the top position of this view relative to its parent. This method is meant to be called 5891 * by the layout system and should not generally be called otherwise, because the property 5892 * may be changed at any time by the layout. 5893 * 5894 * @param top The top of this view, in pixels. 5895 */ 5896 public final void setTop(int top) { 5897 if (top != mTop) { 5898 updateMatrix(); 5899 if (mMatrixIsIdentity) { 5900 final ViewParent p = mParent; 5901 if (p != null && mAttachInfo != null) { 5902 final Rect r = mAttachInfo.mTmpInvalRect; 5903 int minTop; 5904 int yLoc; 5905 if (top < mTop) { 5906 minTop = top; 5907 yLoc = top - mTop; 5908 } else { 5909 minTop = mTop; 5910 yLoc = 0; 5911 } 5912 r.set(0, yLoc, mRight - mLeft, mBottom - minTop); 5913 p.invalidateChild(this, r); 5914 } 5915 } else { 5916 // Double-invalidation is necessary to capture view's old and new areas 5917 invalidate(); 5918 } 5919 5920 int width = mRight - mLeft; 5921 int oldHeight = mBottom - mTop; 5922 5923 mTop = top; 5924 5925 onSizeChanged(width, mBottom - mTop, width, oldHeight); 5926 5927 if (!mMatrixIsIdentity) { 5928 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5929 // A change in dimension means an auto-centered pivot point changes, too 5930 mMatrixDirty = true; 5931 } 5932 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5933 invalidate(); 5934 } 5935 mBackgroundSizeChanged = true; 5936 } 5937 } 5938 5939 /** 5940 * Bottom position of this view relative to its parent. 5941 * 5942 * @return The bottom of this view, in pixels. 5943 */ 5944 @ViewDebug.CapturedViewProperty 5945 public final int getBottom() { 5946 return mBottom; 5947 } 5948 5949 /** 5950 * True if this view has changed since the last time being drawn. 5951 * 5952 * @return The dirty state of this view. 5953 */ 5954 public boolean isDirty() { 5955 return (mPrivateFlags & DIRTY_MASK) != 0; 5956 } 5957 5958 /** 5959 * Sets the bottom position of this view relative to its parent. This method is meant to be 5960 * called by the layout system and should not generally be called otherwise, because the 5961 * property may be changed at any time by the layout. 5962 * 5963 * @param bottom The bottom of this view, in pixels. 5964 */ 5965 public final void setBottom(int bottom) { 5966 if (bottom != mBottom) { 5967 updateMatrix(); 5968 if (mMatrixIsIdentity) { 5969 final ViewParent p = mParent; 5970 if (p != null && mAttachInfo != null) { 5971 final Rect r = mAttachInfo.mTmpInvalRect; 5972 int maxBottom; 5973 if (bottom < mBottom) { 5974 maxBottom = mBottom; 5975 } else { 5976 maxBottom = bottom; 5977 } 5978 r.set(0, 0, mRight - mLeft, maxBottom - mTop); 5979 p.invalidateChild(this, r); 5980 } 5981 } else { 5982 // Double-invalidation is necessary to capture view's old and new areas 5983 invalidate(); 5984 } 5985 5986 int width = mRight - mLeft; 5987 int oldHeight = mBottom - mTop; 5988 5989 mBottom = bottom; 5990 5991 onSizeChanged(width, mBottom - mTop, width, oldHeight); 5992 5993 if (!mMatrixIsIdentity) { 5994 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 5995 // A change in dimension means an auto-centered pivot point changes, too 5996 mMatrixDirty = true; 5997 } 5998 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 5999 invalidate(); 6000 } 6001 mBackgroundSizeChanged = true; 6002 } 6003 } 6004 6005 /** 6006 * Left position of this view relative to its parent. 6007 * 6008 * @return The left edge of this view, in pixels. 6009 */ 6010 @ViewDebug.CapturedViewProperty 6011 public final int getLeft() { 6012 return mLeft; 6013 } 6014 6015 /** 6016 * Sets the left position of this view relative to its parent. This method is meant to be called 6017 * by the layout system and should not generally be called otherwise, because the property 6018 * may be changed at any time by the layout. 6019 * 6020 * @param left The bottom of this view, in pixels. 6021 */ 6022 public final void setLeft(int left) { 6023 if (left != mLeft) { 6024 updateMatrix(); 6025 if (mMatrixIsIdentity) { 6026 final ViewParent p = mParent; 6027 if (p != null && mAttachInfo != null) { 6028 final Rect r = mAttachInfo.mTmpInvalRect; 6029 int minLeft; 6030 int xLoc; 6031 if (left < mLeft) { 6032 minLeft = left; 6033 xLoc = left - mLeft; 6034 } else { 6035 minLeft = mLeft; 6036 xLoc = 0; 6037 } 6038 r.set(xLoc, 0, mRight - minLeft, mBottom - mTop); 6039 p.invalidateChild(this, r); 6040 } 6041 } else { 6042 // Double-invalidation is necessary to capture view's old and new areas 6043 invalidate(); 6044 } 6045 6046 int oldWidth = mRight - mLeft; 6047 int height = mBottom - mTop; 6048 6049 mLeft = left; 6050 6051 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6052 6053 if (!mMatrixIsIdentity) { 6054 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6055 // A change in dimension means an auto-centered pivot point changes, too 6056 mMatrixDirty = true; 6057 } 6058 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6059 invalidate(); 6060 } 6061 mBackgroundSizeChanged = true; 6062 } 6063 } 6064 6065 /** 6066 * Right position of this view relative to its parent. 6067 * 6068 * @return The right edge of this view, in pixels. 6069 */ 6070 @ViewDebug.CapturedViewProperty 6071 public final int getRight() { 6072 return mRight; 6073 } 6074 6075 /** 6076 * Sets the right position of this view relative to its parent. This method is meant to be called 6077 * by the layout system and should not generally be called otherwise, because the property 6078 * may be changed at any time by the layout. 6079 * 6080 * @param right The bottom of this view, in pixels. 6081 */ 6082 public final void setRight(int right) { 6083 if (right != mRight) { 6084 updateMatrix(); 6085 if (mMatrixIsIdentity) { 6086 final ViewParent p = mParent; 6087 if (p != null && mAttachInfo != null) { 6088 final Rect r = mAttachInfo.mTmpInvalRect; 6089 int maxRight; 6090 if (right < mRight) { 6091 maxRight = mRight; 6092 } else { 6093 maxRight = right; 6094 } 6095 r.set(0, 0, maxRight - mLeft, mBottom - mTop); 6096 p.invalidateChild(this, r); 6097 } 6098 } else { 6099 // Double-invalidation is necessary to capture view's old and new areas 6100 invalidate(); 6101 } 6102 6103 int oldWidth = mRight - mLeft; 6104 int height = mBottom - mTop; 6105 6106 mRight = right; 6107 6108 onSizeChanged(mRight - mLeft, height, oldWidth, height); 6109 6110 if (!mMatrixIsIdentity) { 6111 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 6112 // A change in dimension means an auto-centered pivot point changes, too 6113 mMatrixDirty = true; 6114 } 6115 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6116 invalidate(); 6117 } 6118 mBackgroundSizeChanged = true; 6119 } 6120 } 6121 6122 /** 6123 * The visual x position of this view, in pixels. This is equivalent to the 6124 * {@link #setTranslationX(float) translationX} property plus the current 6125 * {@link #getLeft() left} property. 6126 * 6127 * @return The visual x position of this view, in pixels. 6128 */ 6129 public float getX() { 6130 return mLeft + mTranslationX; 6131 } 6132 6133 /** 6134 * Sets the visual x position of this view, in pixels. This is equivalent to setting the 6135 * {@link #setTranslationX(float) translationX} property to be the difference between 6136 * the x value passed in and the current {@link #getLeft() left} property. 6137 * 6138 * @param x The visual x position of this view, in pixels. 6139 */ 6140 public void setX(float x) { 6141 setTranslationX(x - mLeft); 6142 } 6143 6144 /** 6145 * The visual y position of this view, in pixels. This is equivalent to the 6146 * {@link #setTranslationY(float) translationY} property plus the current 6147 * {@link #getTop() top} property. 6148 * 6149 * @return The visual y position of this view, in pixels. 6150 */ 6151 public float getY() { 6152 return mTop + mTranslationY; 6153 } 6154 6155 /** 6156 * Sets the visual y position of this view, in pixels. This is equivalent to setting the 6157 * {@link #setTranslationY(float) translationY} property to be the difference between 6158 * the y value passed in and the current {@link #getTop() top} property. 6159 * 6160 * @param y The visual y position of this view, in pixels. 6161 */ 6162 public void setY(float y) { 6163 setTranslationY(y - mTop); 6164 } 6165 6166 6167 /** 6168 * The horizontal location of this view relative to its {@link #getLeft() left} position. 6169 * This position is post-layout, in addition to wherever the object's 6170 * layout placed it. 6171 * 6172 * @return The horizontal position of this view relative to its left position, in pixels. 6173 */ 6174 public float getTranslationX() { 6175 return mTranslationX; 6176 } 6177 6178 /** 6179 * Sets the horizontal location of this view relative to its {@link #getLeft() left} position. 6180 * This effectively positions the object post-layout, in addition to wherever the object's 6181 * layout placed it. 6182 * 6183 * @param translationX The horizontal position of this view relative to its left position, 6184 * in pixels. 6185 * 6186 * @attr ref android.R.styleable#View_translationX 6187 */ 6188 public void setTranslationX(float translationX) { 6189 if (mTranslationX != translationX) { 6190 // Double-invalidation is necessary to capture view's old and new areas 6191 invalidate(false); 6192 mTranslationX = translationX; 6193 mMatrixDirty = true; 6194 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6195 invalidate(false); 6196 } 6197 } 6198 6199 /** 6200 * The horizontal location of this view relative to its {@link #getTop() top} position. 6201 * This position is post-layout, in addition to wherever the object's 6202 * layout placed it. 6203 * 6204 * @return The vertical position of this view relative to its top position, 6205 * in pixels. 6206 */ 6207 public float getTranslationY() { 6208 return mTranslationY; 6209 } 6210 6211 /** 6212 * Sets the vertical location of this view relative to its {@link #getTop() top} position. 6213 * This effectively positions the object post-layout, in addition to wherever the object's 6214 * layout placed it. 6215 * 6216 * @param translationY The vertical position of this view relative to its top position, 6217 * in pixels. 6218 * 6219 * @attr ref android.R.styleable#View_translationY 6220 */ 6221 public void setTranslationY(float translationY) { 6222 if (mTranslationY != translationY) { 6223 // Double-invalidation is necessary to capture view's old and new areas 6224 invalidate(false); 6225 mTranslationY = translationY; 6226 mMatrixDirty = true; 6227 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6228 invalidate(false); 6229 } 6230 } 6231 6232 /** 6233 * Hit rectangle in parent's coordinates 6234 * 6235 * @param outRect The hit rectangle of the view. 6236 */ 6237 public void getHitRect(Rect outRect) { 6238 updateMatrix(); 6239 if (mMatrixIsIdentity || mAttachInfo == null) { 6240 outRect.set(mLeft, mTop, mRight, mBottom); 6241 } else { 6242 final RectF tmpRect = mAttachInfo.mTmpTransformRect; 6243 tmpRect.set(-mPivotX, -mPivotY, getWidth() - mPivotX, getHeight() - mPivotY); 6244 mMatrix.mapRect(tmpRect); 6245 outRect.set((int) tmpRect.left + mLeft, (int) tmpRect.top + mTop, 6246 (int) tmpRect.right + mLeft, (int) tmpRect.bottom + mTop); 6247 } 6248 } 6249 6250 /** 6251 * Determines whether the given point, in local coordinates is inside the view. 6252 */ 6253 /*package*/ final boolean pointInView(float localX, float localY) { 6254 return localX >= 0 && localX < (mRight - mLeft) 6255 && localY >= 0 && localY < (mBottom - mTop); 6256 } 6257 6258 /** 6259 * Utility method to determine whether the given point, in local coordinates, 6260 * is inside the view, where the area of the view is expanded by the slop factor. 6261 * This method is called while processing touch-move events to determine if the event 6262 * is still within the view. 6263 */ 6264 private boolean pointInView(float localX, float localY, float slop) { 6265 return localX >= -slop && localY >= -slop && localX < ((mRight - mLeft) + slop) && 6266 localY < ((mBottom - mTop) + slop); 6267 } 6268 6269 /** 6270 * When a view has focus and the user navigates away from it, the next view is searched for 6271 * starting from the rectangle filled in by this method. 6272 * 6273 * By default, the rectange is the {@link #getDrawingRect})of the view. However, if your 6274 * view maintains some idea of internal selection, such as a cursor, or a selected row 6275 * or column, you should override this method and fill in a more specific rectangle. 6276 * 6277 * @param r The rectangle to fill in, in this view's coordinates. 6278 */ 6279 public void getFocusedRect(Rect r) { 6280 getDrawingRect(r); 6281 } 6282 6283 /** 6284 * If some part of this view is not clipped by any of its parents, then 6285 * return that area in r in global (root) coordinates. To convert r to local 6286 * coordinates, offset it by -globalOffset (e.g. r.offset(-globalOffset.x, 6287 * -globalOffset.y)) If the view is completely clipped or translated out, 6288 * return false. 6289 * 6290 * @param r If true is returned, r holds the global coordinates of the 6291 * visible portion of this view. 6292 * @param globalOffset If true is returned, globalOffset holds the dx,dy 6293 * between this view and its root. globalOffet may be null. 6294 * @return true if r is non-empty (i.e. part of the view is visible at the 6295 * root level. 6296 */ 6297 public boolean getGlobalVisibleRect(Rect r, Point globalOffset) { 6298 int width = mRight - mLeft; 6299 int height = mBottom - mTop; 6300 if (width > 0 && height > 0) { 6301 r.set(0, 0, width, height); 6302 if (globalOffset != null) { 6303 globalOffset.set(-mScrollX, -mScrollY); 6304 } 6305 return mParent == null || mParent.getChildVisibleRect(this, r, globalOffset); 6306 } 6307 return false; 6308 } 6309 6310 public final boolean getGlobalVisibleRect(Rect r) { 6311 return getGlobalVisibleRect(r, null); 6312 } 6313 6314 public final boolean getLocalVisibleRect(Rect r) { 6315 Point offset = new Point(); 6316 if (getGlobalVisibleRect(r, offset)) { 6317 r.offset(-offset.x, -offset.y); // make r local 6318 return true; 6319 } 6320 return false; 6321 } 6322 6323 /** 6324 * Offset this view's vertical location by the specified number of pixels. 6325 * 6326 * @param offset the number of pixels to offset the view by 6327 */ 6328 public void offsetTopAndBottom(int offset) { 6329 if (offset != 0) { 6330 updateMatrix(); 6331 if (mMatrixIsIdentity) { 6332 final ViewParent p = mParent; 6333 if (p != null && mAttachInfo != null) { 6334 final Rect r = mAttachInfo.mTmpInvalRect; 6335 int minTop; 6336 int maxBottom; 6337 int yLoc; 6338 if (offset < 0) { 6339 minTop = mTop + offset; 6340 maxBottom = mBottom; 6341 yLoc = offset; 6342 } else { 6343 minTop = mTop; 6344 maxBottom = mBottom + offset; 6345 yLoc = 0; 6346 } 6347 r.set(0, yLoc, mRight - mLeft, maxBottom - minTop); 6348 p.invalidateChild(this, r); 6349 } 6350 } else { 6351 invalidate(false); 6352 } 6353 6354 mTop += offset; 6355 mBottom += offset; 6356 6357 if (!mMatrixIsIdentity) { 6358 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6359 invalidate(false); 6360 } 6361 } 6362 } 6363 6364 /** 6365 * Offset this view's horizontal location by the specified amount of pixels. 6366 * 6367 * @param offset the numer of pixels to offset the view by 6368 */ 6369 public void offsetLeftAndRight(int offset) { 6370 if (offset != 0) { 6371 updateMatrix(); 6372 if (mMatrixIsIdentity) { 6373 final ViewParent p = mParent; 6374 if (p != null && mAttachInfo != null) { 6375 final Rect r = mAttachInfo.mTmpInvalRect; 6376 int minLeft; 6377 int maxRight; 6378 if (offset < 0) { 6379 minLeft = mLeft + offset; 6380 maxRight = mRight; 6381 } else { 6382 minLeft = mLeft; 6383 maxRight = mRight + offset; 6384 } 6385 r.set(0, 0, maxRight - minLeft, mBottom - mTop); 6386 p.invalidateChild(this, r); 6387 } 6388 } else { 6389 invalidate(false); 6390 } 6391 6392 mLeft += offset; 6393 mRight += offset; 6394 6395 if (!mMatrixIsIdentity) { 6396 mPrivateFlags |= DRAWN; // force another invalidation with the new orientation 6397 invalidate(false); 6398 } 6399 } 6400 } 6401 6402 /** 6403 * Get the LayoutParams associated with this view. All views should have 6404 * layout parameters. These supply parameters to the <i>parent</i> of this 6405 * view specifying how it should be arranged. There are many subclasses of 6406 * ViewGroup.LayoutParams, and these correspond to the different subclasses 6407 * of ViewGroup that are responsible for arranging their children. 6408 * @return The LayoutParams associated with this view 6409 */ 6410 @ViewDebug.ExportedProperty(deepExport = true, prefix = "layout_") 6411 public ViewGroup.LayoutParams getLayoutParams() { 6412 return mLayoutParams; 6413 } 6414 6415 /** 6416 * Set the layout parameters associated with this view. These supply 6417 * parameters to the <i>parent</i> of this view specifying how it should be 6418 * arranged. There are many subclasses of ViewGroup.LayoutParams, and these 6419 * correspond to the different subclasses of ViewGroup that are responsible 6420 * for arranging their children. 6421 * 6422 * @param params the layout parameters for this view 6423 */ 6424 public void setLayoutParams(ViewGroup.LayoutParams params) { 6425 if (params == null) { 6426 throw new NullPointerException("params == null"); 6427 } 6428 mLayoutParams = params; 6429 requestLayout(); 6430 } 6431 6432 /** 6433 * Set the scrolled position of your view. This will cause a call to 6434 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6435 * invalidated. 6436 * @param x the x position to scroll to 6437 * @param y the y position to scroll to 6438 */ 6439 public void scrollTo(int x, int y) { 6440 if (mScrollX != x || mScrollY != y) { 6441 int oldX = mScrollX; 6442 int oldY = mScrollY; 6443 mScrollX = x; 6444 mScrollY = y; 6445 onScrollChanged(mScrollX, mScrollY, oldX, oldY); 6446 if (!awakenScrollBars()) { 6447 invalidate(); 6448 } 6449 } 6450 } 6451 6452 /** 6453 * Move the scrolled position of your view. This will cause a call to 6454 * {@link #onScrollChanged(int, int, int, int)} and the view will be 6455 * invalidated. 6456 * @param x the amount of pixels to scroll by horizontally 6457 * @param y the amount of pixels to scroll by vertically 6458 */ 6459 public void scrollBy(int x, int y) { 6460 scrollTo(mScrollX + x, mScrollY + y); 6461 } 6462 6463 /** 6464 * <p>Trigger the scrollbars to draw. When invoked this method starts an 6465 * animation to fade the scrollbars out after a default delay. If a subclass 6466 * provides animated scrolling, the start delay should equal the duration 6467 * of the scrolling animation.</p> 6468 * 6469 * <p>The animation starts only if at least one of the scrollbars is 6470 * enabled, as specified by {@link #isHorizontalScrollBarEnabled()} and 6471 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6472 * this method returns true, and false otherwise. If the animation is 6473 * started, this method calls {@link #invalidate()}; in that case the 6474 * caller should not call {@link #invalidate()}.</p> 6475 * 6476 * <p>This method should be invoked every time a subclass directly updates 6477 * the scroll parameters.</p> 6478 * 6479 * <p>This method is automatically invoked by {@link #scrollBy(int, int)} 6480 * and {@link #scrollTo(int, int)}.</p> 6481 * 6482 * @return true if the animation is played, false otherwise 6483 * 6484 * @see #awakenScrollBars(int) 6485 * @see #scrollBy(int, int) 6486 * @see #scrollTo(int, int) 6487 * @see #isHorizontalScrollBarEnabled() 6488 * @see #isVerticalScrollBarEnabled() 6489 * @see #setHorizontalScrollBarEnabled(boolean) 6490 * @see #setVerticalScrollBarEnabled(boolean) 6491 */ 6492 protected boolean awakenScrollBars() { 6493 return mScrollCache != null && 6494 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade, true); 6495 } 6496 6497 /** 6498 * Trigger the scrollbars to draw. 6499 * This method differs from awakenScrollBars() only in its default duration. 6500 * initialAwakenScrollBars() will show the scroll bars for longer than 6501 * usual to give the user more of a chance to notice them. 6502 * 6503 * @return true if the animation is played, false otherwise. 6504 */ 6505 private boolean initialAwakenScrollBars() { 6506 return mScrollCache != null && 6507 awakenScrollBars(mScrollCache.scrollBarDefaultDelayBeforeFade * 4, true); 6508 } 6509 6510 /** 6511 * <p> 6512 * Trigger the scrollbars to draw. When invoked this method starts an 6513 * animation to fade the scrollbars out after a fixed delay. If a subclass 6514 * provides animated scrolling, the start delay should equal the duration of 6515 * the scrolling animation. 6516 * </p> 6517 * 6518 * <p> 6519 * The animation starts only if at least one of the scrollbars is enabled, 6520 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6521 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6522 * this method returns true, and false otherwise. If the animation is 6523 * started, this method calls {@link #invalidate()}; in that case the caller 6524 * should not call {@link #invalidate()}. 6525 * </p> 6526 * 6527 * <p> 6528 * This method should be invoked everytime a subclass directly updates the 6529 * scroll parameters. 6530 * </p> 6531 * 6532 * @param startDelay the delay, in milliseconds, after which the animation 6533 * should start; when the delay is 0, the animation starts 6534 * immediately 6535 * @return true if the animation is played, false otherwise 6536 * 6537 * @see #scrollBy(int, int) 6538 * @see #scrollTo(int, int) 6539 * @see #isHorizontalScrollBarEnabled() 6540 * @see #isVerticalScrollBarEnabled() 6541 * @see #setHorizontalScrollBarEnabled(boolean) 6542 * @see #setVerticalScrollBarEnabled(boolean) 6543 */ 6544 protected boolean awakenScrollBars(int startDelay) { 6545 return awakenScrollBars(startDelay, true); 6546 } 6547 6548 /** 6549 * <p> 6550 * Trigger the scrollbars to draw. When invoked this method starts an 6551 * animation to fade the scrollbars out after a fixed delay. If a subclass 6552 * provides animated scrolling, the start delay should equal the duration of 6553 * the scrolling animation. 6554 * </p> 6555 * 6556 * <p> 6557 * The animation starts only if at least one of the scrollbars is enabled, 6558 * as specified by {@link #isHorizontalScrollBarEnabled()} and 6559 * {@link #isVerticalScrollBarEnabled()}. When the animation is started, 6560 * this method returns true, and false otherwise. If the animation is 6561 * started, this method calls {@link #invalidate()} if the invalidate parameter 6562 * is set to true; in that case the caller 6563 * should not call {@link #invalidate()}. 6564 * </p> 6565 * 6566 * <p> 6567 * This method should be invoked everytime a subclass directly updates the 6568 * scroll parameters. 6569 * </p> 6570 * 6571 * @param startDelay the delay, in milliseconds, after which the animation 6572 * should start; when the delay is 0, the animation starts 6573 * immediately 6574 * 6575 * @param invalidate Wheter this method should call invalidate 6576 * 6577 * @return true if the animation is played, false otherwise 6578 * 6579 * @see #scrollBy(int, int) 6580 * @see #scrollTo(int, int) 6581 * @see #isHorizontalScrollBarEnabled() 6582 * @see #isVerticalScrollBarEnabled() 6583 * @see #setHorizontalScrollBarEnabled(boolean) 6584 * @see #setVerticalScrollBarEnabled(boolean) 6585 */ 6586 protected boolean awakenScrollBars(int startDelay, boolean invalidate) { 6587 final ScrollabilityCache scrollCache = mScrollCache; 6588 6589 if (scrollCache == null || !scrollCache.fadeScrollBars) { 6590 return false; 6591 } 6592 6593 if (scrollCache.scrollBar == null) { 6594 scrollCache.scrollBar = new ScrollBarDrawable(); 6595 } 6596 6597 if (isHorizontalScrollBarEnabled() || isVerticalScrollBarEnabled()) { 6598 6599 if (invalidate) { 6600 // Invalidate to show the scrollbars 6601 invalidate(); 6602 } 6603 6604 if (scrollCache.state == ScrollabilityCache.OFF) { 6605 // FIXME: this is copied from WindowManagerService. 6606 // We should get this value from the system when it 6607 // is possible to do so. 6608 final int KEY_REPEAT_FIRST_DELAY = 750; 6609 startDelay = Math.max(KEY_REPEAT_FIRST_DELAY, startDelay); 6610 } 6611 6612 // Tell mScrollCache when we should start fading. This may 6613 // extend the fade start time if one was already scheduled 6614 long fadeStartTime = AnimationUtils.currentAnimationTimeMillis() + startDelay; 6615 scrollCache.fadeStartTime = fadeStartTime; 6616 scrollCache.state = ScrollabilityCache.ON; 6617 6618 // Schedule our fader to run, unscheduling any old ones first 6619 if (mAttachInfo != null) { 6620 mAttachInfo.mHandler.removeCallbacks(scrollCache); 6621 mAttachInfo.mHandler.postAtTime(scrollCache, fadeStartTime); 6622 } 6623 6624 return true; 6625 } 6626 6627 return false; 6628 } 6629 6630 /** 6631 * Mark the the area defined by dirty as needing to be drawn. If the view is 6632 * visible, {@link #onDraw} will be called at some point in the future. 6633 * This must be called from a UI thread. To call from a non-UI thread, call 6634 * {@link #postInvalidate()}. 6635 * 6636 * WARNING: This method is destructive to dirty. 6637 * @param dirty the rectangle representing the bounds of the dirty region 6638 */ 6639 public void invalidate(Rect dirty) { 6640 if (ViewDebug.TRACE_HIERARCHY) { 6641 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6642 } 6643 6644 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6645 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 6646 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6647 final ViewParent p = mParent; 6648 final AttachInfo ai = mAttachInfo; 6649 if (p != null && ai != null && ai.mHardwareAccelerated) { 6650 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6651 // with a null dirty rect, which tells the ViewRoot to redraw everything 6652 p.invalidateChild(this, null); 6653 return; 6654 } 6655 if (p != null && ai != null) { 6656 final int scrollX = mScrollX; 6657 final int scrollY = mScrollY; 6658 final Rect r = ai.mTmpInvalRect; 6659 r.set(dirty.left - scrollX, dirty.top - scrollY, 6660 dirty.right - scrollX, dirty.bottom - scrollY); 6661 mParent.invalidateChild(this, r); 6662 } 6663 } 6664 } 6665 6666 /** 6667 * Mark the the area defined by the rect (l,t,r,b) as needing to be drawn. 6668 * The coordinates of the dirty rect are relative to the view. 6669 * If the view is visible, {@link #onDraw} will be called at some point 6670 * in the future. This must be called from a UI thread. To call 6671 * from a non-UI thread, call {@link #postInvalidate()}. 6672 * @param l the left position of the dirty region 6673 * @param t the top position of the dirty region 6674 * @param r the right position of the dirty region 6675 * @param b the bottom position of the dirty region 6676 */ 6677 public void invalidate(int l, int t, int r, int b) { 6678 if (ViewDebug.TRACE_HIERARCHY) { 6679 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6680 } 6681 6682 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6683 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 6684 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6685 final ViewParent p = mParent; 6686 final AttachInfo ai = mAttachInfo; 6687 if (p != null && ai != null && ai.mHardwareAccelerated) { 6688 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6689 // with a null dirty rect, which tells the ViewRoot to redraw everything 6690 p.invalidateChild(this, null); 6691 return; 6692 } 6693 if (p != null && ai != null && l < r && t < b) { 6694 final int scrollX = mScrollX; 6695 final int scrollY = mScrollY; 6696 final Rect tmpr = ai.mTmpInvalRect; 6697 tmpr.set(l - scrollX, t - scrollY, r - scrollX, b - scrollY); 6698 p.invalidateChild(this, tmpr); 6699 } 6700 } 6701 } 6702 6703 /** 6704 * Invalidate the whole view. If the view is visible, {@link #onDraw} will 6705 * be called at some point in the future. This must be called from a 6706 * UI thread. To call from a non-UI thread, call {@link #postInvalidate()}. 6707 */ 6708 public void invalidate() { 6709 invalidate(true); 6710 } 6711 6712 /** 6713 * This is where the invalidate() work actually happens. A full invalidate() 6714 * causes the drawing cache to be invalidated, but this function can be called with 6715 * invalidateCache set to false to skip that invalidation step for cases that do not 6716 * need it (for example, a component that remains at the same dimensions with the same 6717 * content). 6718 * 6719 * @param invalidateCache Whether the drawing cache for this view should be invalidated as 6720 * well. This is usually true for a full invalidate, but may be set to false if the 6721 * View's contents or dimensions have not changed. 6722 */ 6723 private void invalidate(boolean invalidateCache) { 6724 if (ViewDebug.TRACE_HIERARCHY) { 6725 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE); 6726 } 6727 6728 if ((mPrivateFlags & (DRAWN | HAS_BOUNDS)) == (DRAWN | HAS_BOUNDS) || 6729 (invalidateCache && (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID)) { 6730 mPrivateFlags &= ~DRAWN; 6731 if (invalidateCache) { 6732 mPrivateFlags &= ~DRAWING_CACHE_VALID; 6733 } 6734 final AttachInfo ai = mAttachInfo; 6735 final ViewParent p = mParent; 6736 if (p != null && ai != null && ai.mHardwareAccelerated) { 6737 // fast-track for GL-enabled applications; just invalidate the whole hierarchy 6738 // with a null dirty rect, which tells the ViewRoot to redraw everything 6739 p.invalidateChild(this, null); 6740 return; 6741 } 6742 6743 if (p != null && ai != null) { 6744 final Rect r = ai.mTmpInvalRect; 6745 r.set(0, 0, mRight - mLeft, mBottom - mTop); 6746 // Don't call invalidate -- we don't want to internally scroll 6747 // our own bounds 6748 p.invalidateChild(this, r); 6749 } 6750 } 6751 } 6752 6753 /** 6754 * Indicates whether this View is opaque. An opaque View guarantees that it will 6755 * draw all the pixels overlapping its bounds using a fully opaque color. 6756 * 6757 * Subclasses of View should override this method whenever possible to indicate 6758 * whether an instance is opaque. Opaque Views are treated in a special way by 6759 * the View hierarchy, possibly allowing it to perform optimizations during 6760 * invalidate/draw passes. 6761 * 6762 * @return True if this View is guaranteed to be fully opaque, false otherwise. 6763 */ 6764 @ViewDebug.ExportedProperty(category = "drawing") 6765 public boolean isOpaque() { 6766 return (mPrivateFlags & OPAQUE_MASK) == OPAQUE_MASK && 6767 (mAlpha >= 1.0f - ViewConfiguration.ALPHA_THRESHOLD); 6768 } 6769 6770 /** 6771 * @hide 6772 */ 6773 protected void computeOpaqueFlags() { 6774 // Opaque if: 6775 // - Has a background 6776 // - Background is opaque 6777 // - Doesn't have scrollbars or scrollbars are inside overlay 6778 6779 if (mBGDrawable != null && mBGDrawable.getOpacity() == PixelFormat.OPAQUE) { 6780 mPrivateFlags |= OPAQUE_BACKGROUND; 6781 } else { 6782 mPrivateFlags &= ~OPAQUE_BACKGROUND; 6783 } 6784 6785 final int flags = mViewFlags; 6786 if (((flags & SCROLLBARS_VERTICAL) == 0 && (flags & SCROLLBARS_HORIZONTAL) == 0) || 6787 (flags & SCROLLBARS_STYLE_MASK) == SCROLLBARS_INSIDE_OVERLAY) { 6788 mPrivateFlags |= OPAQUE_SCROLLBARS; 6789 } else { 6790 mPrivateFlags &= ~OPAQUE_SCROLLBARS; 6791 } 6792 } 6793 6794 /** 6795 * @hide 6796 */ 6797 protected boolean hasOpaqueScrollbars() { 6798 return (mPrivateFlags & OPAQUE_SCROLLBARS) == OPAQUE_SCROLLBARS; 6799 } 6800 6801 /** 6802 * @return A handler associated with the thread running the View. This 6803 * handler can be used to pump events in the UI events queue. 6804 */ 6805 public Handler getHandler() { 6806 if (mAttachInfo != null) { 6807 return mAttachInfo.mHandler; 6808 } 6809 return null; 6810 } 6811 6812 /** 6813 * Causes the Runnable to be added to the message queue. 6814 * The runnable will be run on the user interface thread. 6815 * 6816 * @param action The Runnable that will be executed. 6817 * 6818 * @return Returns true if the Runnable was successfully placed in to the 6819 * message queue. Returns false on failure, usually because the 6820 * looper processing the message queue is exiting. 6821 */ 6822 public boolean post(Runnable action) { 6823 Handler handler; 6824 if (mAttachInfo != null) { 6825 handler = mAttachInfo.mHandler; 6826 } else { 6827 // Assume that post will succeed later 6828 ViewRoot.getRunQueue().post(action); 6829 return true; 6830 } 6831 6832 return handler.post(action); 6833 } 6834 6835 /** 6836 * Causes the Runnable to be added to the message queue, to be run 6837 * after the specified amount of time elapses. 6838 * The runnable will be run on the user interface thread. 6839 * 6840 * @param action The Runnable that will be executed. 6841 * @param delayMillis The delay (in milliseconds) until the Runnable 6842 * will be executed. 6843 * 6844 * @return true if the Runnable was successfully placed in to the 6845 * message queue. Returns false on failure, usually because the 6846 * looper processing the message queue is exiting. Note that a 6847 * result of true does not mean the Runnable will be processed -- 6848 * if the looper is quit before the delivery time of the message 6849 * occurs then the message will be dropped. 6850 */ 6851 public boolean postDelayed(Runnable action, long delayMillis) { 6852 Handler handler; 6853 if (mAttachInfo != null) { 6854 handler = mAttachInfo.mHandler; 6855 } else { 6856 // Assume that post will succeed later 6857 ViewRoot.getRunQueue().postDelayed(action, delayMillis); 6858 return true; 6859 } 6860 6861 return handler.postDelayed(action, delayMillis); 6862 } 6863 6864 /** 6865 * Removes the specified Runnable from the message queue. 6866 * 6867 * @param action The Runnable to remove from the message handling queue 6868 * 6869 * @return true if this view could ask the Handler to remove the Runnable, 6870 * false otherwise. When the returned value is true, the Runnable 6871 * may or may not have been actually removed from the message queue 6872 * (for instance, if the Runnable was not in the queue already.) 6873 */ 6874 public boolean removeCallbacks(Runnable action) { 6875 Handler handler; 6876 if (mAttachInfo != null) { 6877 handler = mAttachInfo.mHandler; 6878 } else { 6879 // Assume that post will succeed later 6880 ViewRoot.getRunQueue().removeCallbacks(action); 6881 return true; 6882 } 6883 6884 handler.removeCallbacks(action); 6885 return true; 6886 } 6887 6888 /** 6889 * Cause an invalidate to happen on a subsequent cycle through the event loop. 6890 * Use this to invalidate the View from a non-UI thread. 6891 * 6892 * @see #invalidate() 6893 */ 6894 public void postInvalidate() { 6895 postInvalidateDelayed(0); 6896 } 6897 6898 /** 6899 * Cause an invalidate of the specified area to happen on a subsequent cycle 6900 * through the event loop. Use this to invalidate the View from a non-UI thread. 6901 * 6902 * @param left The left coordinate of the rectangle to invalidate. 6903 * @param top The top coordinate of the rectangle to invalidate. 6904 * @param right The right coordinate of the rectangle to invalidate. 6905 * @param bottom The bottom coordinate of the rectangle to invalidate. 6906 * 6907 * @see #invalidate(int, int, int, int) 6908 * @see #invalidate(Rect) 6909 */ 6910 public void postInvalidate(int left, int top, int right, int bottom) { 6911 postInvalidateDelayed(0, left, top, right, bottom); 6912 } 6913 6914 /** 6915 * Cause an invalidate to happen on a subsequent cycle through the event 6916 * loop. Waits for the specified amount of time. 6917 * 6918 * @param delayMilliseconds the duration in milliseconds to delay the 6919 * invalidation by 6920 */ 6921 public void postInvalidateDelayed(long delayMilliseconds) { 6922 // We try only with the AttachInfo because there's no point in invalidating 6923 // if we are not attached to our window 6924 if (mAttachInfo != null) { 6925 Message msg = Message.obtain(); 6926 msg.what = AttachInfo.INVALIDATE_MSG; 6927 msg.obj = this; 6928 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6929 } 6930 } 6931 6932 /** 6933 * Cause an invalidate of the specified area to happen on a subsequent cycle 6934 * through the event loop. Waits for the specified amount of time. 6935 * 6936 * @param delayMilliseconds the duration in milliseconds to delay the 6937 * invalidation by 6938 * @param left The left coordinate of the rectangle to invalidate. 6939 * @param top The top coordinate of the rectangle to invalidate. 6940 * @param right The right coordinate of the rectangle to invalidate. 6941 * @param bottom The bottom coordinate of the rectangle to invalidate. 6942 */ 6943 public void postInvalidateDelayed(long delayMilliseconds, int left, int top, 6944 int right, int bottom) { 6945 6946 // We try only with the AttachInfo because there's no point in invalidating 6947 // if we are not attached to our window 6948 if (mAttachInfo != null) { 6949 final AttachInfo.InvalidateInfo info = AttachInfo.InvalidateInfo.acquire(); 6950 info.target = this; 6951 info.left = left; 6952 info.top = top; 6953 info.right = right; 6954 info.bottom = bottom; 6955 6956 final Message msg = Message.obtain(); 6957 msg.what = AttachInfo.INVALIDATE_RECT_MSG; 6958 msg.obj = info; 6959 mAttachInfo.mHandler.sendMessageDelayed(msg, delayMilliseconds); 6960 } 6961 } 6962 6963 /** 6964 * Called by a parent to request that a child update its values for mScrollX 6965 * and mScrollY if necessary. This will typically be done if the child is 6966 * animating a scroll using a {@link android.widget.Scroller Scroller} 6967 * object. 6968 */ 6969 public void computeScroll() { 6970 } 6971 6972 /** 6973 * <p>Indicate whether the horizontal edges are faded when the view is 6974 * scrolled horizontally.</p> 6975 * 6976 * @return true if the horizontal edges should are faded on scroll, false 6977 * otherwise 6978 * 6979 * @see #setHorizontalFadingEdgeEnabled(boolean) 6980 * @attr ref android.R.styleable#View_fadingEdge 6981 */ 6982 public boolean isHorizontalFadingEdgeEnabled() { 6983 return (mViewFlags & FADING_EDGE_HORIZONTAL) == FADING_EDGE_HORIZONTAL; 6984 } 6985 6986 /** 6987 * <p>Define whether the horizontal edges should be faded when this view 6988 * is scrolled horizontally.</p> 6989 * 6990 * @param horizontalFadingEdgeEnabled true if the horizontal edges should 6991 * be faded when the view is scrolled 6992 * horizontally 6993 * 6994 * @see #isHorizontalFadingEdgeEnabled() 6995 * @attr ref android.R.styleable#View_fadingEdge 6996 */ 6997 public void setHorizontalFadingEdgeEnabled(boolean horizontalFadingEdgeEnabled) { 6998 if (isHorizontalFadingEdgeEnabled() != horizontalFadingEdgeEnabled) { 6999 if (horizontalFadingEdgeEnabled) { 7000 initScrollCache(); 7001 } 7002 7003 mViewFlags ^= FADING_EDGE_HORIZONTAL; 7004 } 7005 } 7006 7007 /** 7008 * <p>Indicate whether the vertical edges are faded when the view is 7009 * scrolled horizontally.</p> 7010 * 7011 * @return true if the vertical edges should are faded on scroll, false 7012 * otherwise 7013 * 7014 * @see #setVerticalFadingEdgeEnabled(boolean) 7015 * @attr ref android.R.styleable#View_fadingEdge 7016 */ 7017 public boolean isVerticalFadingEdgeEnabled() { 7018 return (mViewFlags & FADING_EDGE_VERTICAL) == FADING_EDGE_VERTICAL; 7019 } 7020 7021 /** 7022 * <p>Define whether the vertical edges should be faded when this view 7023 * is scrolled vertically.</p> 7024 * 7025 * @param verticalFadingEdgeEnabled true if the vertical edges should 7026 * be faded when the view is scrolled 7027 * vertically 7028 * 7029 * @see #isVerticalFadingEdgeEnabled() 7030 * @attr ref android.R.styleable#View_fadingEdge 7031 */ 7032 public void setVerticalFadingEdgeEnabled(boolean verticalFadingEdgeEnabled) { 7033 if (isVerticalFadingEdgeEnabled() != verticalFadingEdgeEnabled) { 7034 if (verticalFadingEdgeEnabled) { 7035 initScrollCache(); 7036 } 7037 7038 mViewFlags ^= FADING_EDGE_VERTICAL; 7039 } 7040 } 7041 7042 /** 7043 * Returns the strength, or intensity, of the top faded edge. The strength is 7044 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7045 * returns 0.0 or 1.0 but no value in between. 7046 * 7047 * Subclasses should override this method to provide a smoother fade transition 7048 * when scrolling occurs. 7049 * 7050 * @return the intensity of the top fade as a float between 0.0f and 1.0f 7051 */ 7052 protected float getTopFadingEdgeStrength() { 7053 return computeVerticalScrollOffset() > 0 ? 1.0f : 0.0f; 7054 } 7055 7056 /** 7057 * Returns the strength, or intensity, of the bottom faded edge. The strength is 7058 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7059 * returns 0.0 or 1.0 but no value in between. 7060 * 7061 * Subclasses should override this method to provide a smoother fade transition 7062 * when scrolling occurs. 7063 * 7064 * @return the intensity of the bottom fade as a float between 0.0f and 1.0f 7065 */ 7066 protected float getBottomFadingEdgeStrength() { 7067 return computeVerticalScrollOffset() + computeVerticalScrollExtent() < 7068 computeVerticalScrollRange() ? 1.0f : 0.0f; 7069 } 7070 7071 /** 7072 * Returns the strength, or intensity, of the left faded edge. The strength is 7073 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7074 * returns 0.0 or 1.0 but no value in between. 7075 * 7076 * Subclasses should override this method to provide a smoother fade transition 7077 * when scrolling occurs. 7078 * 7079 * @return the intensity of the left fade as a float between 0.0f and 1.0f 7080 */ 7081 protected float getLeftFadingEdgeStrength() { 7082 return computeHorizontalScrollOffset() > 0 ? 1.0f : 0.0f; 7083 } 7084 7085 /** 7086 * Returns the strength, or intensity, of the right faded edge. The strength is 7087 * a value between 0.0 (no fade) and 1.0 (full fade). The default implementation 7088 * returns 0.0 or 1.0 but no value in between. 7089 * 7090 * Subclasses should override this method to provide a smoother fade transition 7091 * when scrolling occurs. 7092 * 7093 * @return the intensity of the right fade as a float between 0.0f and 1.0f 7094 */ 7095 protected float getRightFadingEdgeStrength() { 7096 return computeHorizontalScrollOffset() + computeHorizontalScrollExtent() < 7097 computeHorizontalScrollRange() ? 1.0f : 0.0f; 7098 } 7099 7100 /** 7101 * <p>Indicate whether the horizontal scrollbar should be drawn or not. The 7102 * scrollbar is not drawn by default.</p> 7103 * 7104 * @return true if the horizontal scrollbar should be painted, false 7105 * otherwise 7106 * 7107 * @see #setHorizontalScrollBarEnabled(boolean) 7108 */ 7109 public boolean isHorizontalScrollBarEnabled() { 7110 return (mViewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7111 } 7112 7113 /** 7114 * <p>Define whether the horizontal scrollbar should be drawn or not. The 7115 * scrollbar is not drawn by default.</p> 7116 * 7117 * @param horizontalScrollBarEnabled true if the horizontal scrollbar should 7118 * be painted 7119 * 7120 * @see #isHorizontalScrollBarEnabled() 7121 */ 7122 public void setHorizontalScrollBarEnabled(boolean horizontalScrollBarEnabled) { 7123 if (isHorizontalScrollBarEnabled() != horizontalScrollBarEnabled) { 7124 mViewFlags ^= SCROLLBARS_HORIZONTAL; 7125 computeOpaqueFlags(); 7126 recomputePadding(); 7127 } 7128 } 7129 7130 /** 7131 * <p>Indicate whether the vertical scrollbar should be drawn or not. The 7132 * scrollbar is not drawn by default.</p> 7133 * 7134 * @return true if the vertical scrollbar should be painted, false 7135 * otherwise 7136 * 7137 * @see #setVerticalScrollBarEnabled(boolean) 7138 */ 7139 public boolean isVerticalScrollBarEnabled() { 7140 return (mViewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL; 7141 } 7142 7143 /** 7144 * <p>Define whether the vertical scrollbar should be drawn or not. The 7145 * scrollbar is not drawn by default.</p> 7146 * 7147 * @param verticalScrollBarEnabled true if the vertical scrollbar should 7148 * be painted 7149 * 7150 * @see #isVerticalScrollBarEnabled() 7151 */ 7152 public void setVerticalScrollBarEnabled(boolean verticalScrollBarEnabled) { 7153 if (isVerticalScrollBarEnabled() != verticalScrollBarEnabled) { 7154 mViewFlags ^= SCROLLBARS_VERTICAL; 7155 computeOpaqueFlags(); 7156 recomputePadding(); 7157 } 7158 } 7159 7160 /** 7161 * @hide 7162 */ 7163 protected void recomputePadding() { 7164 setPadding(mUserPaddingLeft, mPaddingTop, mUserPaddingRight, mUserPaddingBottom); 7165 } 7166 7167 /** 7168 * Define whether scrollbars will fade when the view is not scrolling. 7169 * 7170 * @param fadeScrollbars wheter to enable fading 7171 * 7172 */ 7173 public void setScrollbarFadingEnabled(boolean fadeScrollbars) { 7174 initScrollCache(); 7175 final ScrollabilityCache scrollabilityCache = mScrollCache; 7176 scrollabilityCache.fadeScrollBars = fadeScrollbars; 7177 if (fadeScrollbars) { 7178 scrollabilityCache.state = ScrollabilityCache.OFF; 7179 } else { 7180 scrollabilityCache.state = ScrollabilityCache.ON; 7181 } 7182 } 7183 7184 /** 7185 * 7186 * Returns true if scrollbars will fade when this view is not scrolling 7187 * 7188 * @return true if scrollbar fading is enabled 7189 */ 7190 public boolean isScrollbarFadingEnabled() { 7191 return mScrollCache != null && mScrollCache.fadeScrollBars; 7192 } 7193 7194 /** 7195 * <p>Specify the style of the scrollbars. The scrollbars can be overlaid or 7196 * inset. When inset, they add to the padding of the view. And the scrollbars 7197 * can be drawn inside the padding area or on the edge of the view. For example, 7198 * if a view has a background drawable and you want to draw the scrollbars 7199 * inside the padding specified by the drawable, you can use 7200 * SCROLLBARS_INSIDE_OVERLAY or SCROLLBARS_INSIDE_INSET. If you want them to 7201 * appear at the edge of the view, ignoring the padding, then you can use 7202 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET.</p> 7203 * @param style the style of the scrollbars. Should be one of 7204 * SCROLLBARS_INSIDE_OVERLAY, SCROLLBARS_INSIDE_INSET, 7205 * SCROLLBARS_OUTSIDE_OVERLAY or SCROLLBARS_OUTSIDE_INSET. 7206 * @see #SCROLLBARS_INSIDE_OVERLAY 7207 * @see #SCROLLBARS_INSIDE_INSET 7208 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7209 * @see #SCROLLBARS_OUTSIDE_INSET 7210 */ 7211 public void setScrollBarStyle(int style) { 7212 if (style != (mViewFlags & SCROLLBARS_STYLE_MASK)) { 7213 mViewFlags = (mViewFlags & ~SCROLLBARS_STYLE_MASK) | (style & SCROLLBARS_STYLE_MASK); 7214 computeOpaqueFlags(); 7215 recomputePadding(); 7216 } 7217 } 7218 7219 /** 7220 * <p>Returns the current scrollbar style.</p> 7221 * @return the current scrollbar style 7222 * @see #SCROLLBARS_INSIDE_OVERLAY 7223 * @see #SCROLLBARS_INSIDE_INSET 7224 * @see #SCROLLBARS_OUTSIDE_OVERLAY 7225 * @see #SCROLLBARS_OUTSIDE_INSET 7226 */ 7227 public int getScrollBarStyle() { 7228 return mViewFlags & SCROLLBARS_STYLE_MASK; 7229 } 7230 7231 /** 7232 * <p>Compute the horizontal range that the horizontal scrollbar 7233 * represents.</p> 7234 * 7235 * <p>The range is expressed in arbitrary units that must be the same as the 7236 * units used by {@link #computeHorizontalScrollExtent()} and 7237 * {@link #computeHorizontalScrollOffset()}.</p> 7238 * 7239 * <p>The default range is the drawing width of this view.</p> 7240 * 7241 * @return the total horizontal range represented by the horizontal 7242 * scrollbar 7243 * 7244 * @see #computeHorizontalScrollExtent() 7245 * @see #computeHorizontalScrollOffset() 7246 * @see android.widget.ScrollBarDrawable 7247 */ 7248 protected int computeHorizontalScrollRange() { 7249 return getWidth(); 7250 } 7251 7252 /** 7253 * <p>Compute the horizontal offset of the horizontal scrollbar's thumb 7254 * within the horizontal range. This value is used to compute the position 7255 * of the thumb within the scrollbar's track.</p> 7256 * 7257 * <p>The range is expressed in arbitrary units that must be the same as the 7258 * units used by {@link #computeHorizontalScrollRange()} and 7259 * {@link #computeHorizontalScrollExtent()}.</p> 7260 * 7261 * <p>The default offset is the scroll offset of this view.</p> 7262 * 7263 * @return the horizontal offset of the scrollbar's thumb 7264 * 7265 * @see #computeHorizontalScrollRange() 7266 * @see #computeHorizontalScrollExtent() 7267 * @see android.widget.ScrollBarDrawable 7268 */ 7269 protected int computeHorizontalScrollOffset() { 7270 return mScrollX; 7271 } 7272 7273 /** 7274 * <p>Compute the horizontal extent of the horizontal scrollbar's thumb 7275 * within the horizontal range. This value is used to compute the length 7276 * of the thumb within the scrollbar's track.</p> 7277 * 7278 * <p>The range is expressed in arbitrary units that must be the same as the 7279 * units used by {@link #computeHorizontalScrollRange()} and 7280 * {@link #computeHorizontalScrollOffset()}.</p> 7281 * 7282 * <p>The default extent is the drawing width of this view.</p> 7283 * 7284 * @return the horizontal extent of the scrollbar's thumb 7285 * 7286 * @see #computeHorizontalScrollRange() 7287 * @see #computeHorizontalScrollOffset() 7288 * @see android.widget.ScrollBarDrawable 7289 */ 7290 protected int computeHorizontalScrollExtent() { 7291 return getWidth(); 7292 } 7293 7294 /** 7295 * <p>Compute the vertical range that the vertical scrollbar represents.</p> 7296 * 7297 * <p>The range is expressed in arbitrary units that must be the same as the 7298 * units used by {@link #computeVerticalScrollExtent()} and 7299 * {@link #computeVerticalScrollOffset()}.</p> 7300 * 7301 * @return the total vertical range represented by the vertical scrollbar 7302 * 7303 * <p>The default range is the drawing height of this view.</p> 7304 * 7305 * @see #computeVerticalScrollExtent() 7306 * @see #computeVerticalScrollOffset() 7307 * @see android.widget.ScrollBarDrawable 7308 */ 7309 protected int computeVerticalScrollRange() { 7310 return getHeight(); 7311 } 7312 7313 /** 7314 * <p>Compute the vertical offset of the vertical scrollbar's thumb 7315 * within the horizontal range. This value is used to compute the position 7316 * of the thumb within the scrollbar's track.</p> 7317 * 7318 * <p>The range is expressed in arbitrary units that must be the same as the 7319 * units used by {@link #computeVerticalScrollRange()} and 7320 * {@link #computeVerticalScrollExtent()}.</p> 7321 * 7322 * <p>The default offset is the scroll offset of this view.</p> 7323 * 7324 * @return the vertical offset of the scrollbar's thumb 7325 * 7326 * @see #computeVerticalScrollRange() 7327 * @see #computeVerticalScrollExtent() 7328 * @see android.widget.ScrollBarDrawable 7329 */ 7330 protected int computeVerticalScrollOffset() { 7331 return mScrollY; 7332 } 7333 7334 /** 7335 * <p>Compute the vertical extent of the horizontal scrollbar's thumb 7336 * within the vertical range. This value is used to compute the length 7337 * of the thumb within the scrollbar's track.</p> 7338 * 7339 * <p>The range is expressed in arbitrary units that must be the same as the 7340 * units used by {@link #computeVerticalScrollRange()} and 7341 * {@link #computeVerticalScrollOffset()}.</p> 7342 * 7343 * <p>The default extent is the drawing height of this view.</p> 7344 * 7345 * @return the vertical extent of the scrollbar's thumb 7346 * 7347 * @see #computeVerticalScrollRange() 7348 * @see #computeVerticalScrollOffset() 7349 * @see android.widget.ScrollBarDrawable 7350 */ 7351 protected int computeVerticalScrollExtent() { 7352 return getHeight(); 7353 } 7354 7355 /** 7356 * <p>Request the drawing of the horizontal and the vertical scrollbar. The 7357 * scrollbars are painted only if they have been awakened first.</p> 7358 * 7359 * @param canvas the canvas on which to draw the scrollbars 7360 * 7361 * @see #awakenScrollBars(int) 7362 */ 7363 protected final void onDrawScrollBars(Canvas canvas) { 7364 // scrollbars are drawn only when the animation is running 7365 final ScrollabilityCache cache = mScrollCache; 7366 if (cache != null) { 7367 7368 int state = cache.state; 7369 7370 if (state == ScrollabilityCache.OFF) { 7371 return; 7372 } 7373 7374 boolean invalidate = false; 7375 7376 if (state == ScrollabilityCache.FADING) { 7377 // We're fading -- get our fade interpolation 7378 if (cache.interpolatorValues == null) { 7379 cache.interpolatorValues = new float[1]; 7380 } 7381 7382 float[] values = cache.interpolatorValues; 7383 7384 // Stops the animation if we're done 7385 if (cache.scrollBarInterpolator.timeToValues(values) == 7386 Interpolator.Result.FREEZE_END) { 7387 cache.state = ScrollabilityCache.OFF; 7388 } else { 7389 cache.scrollBar.setAlpha(Math.round(values[0])); 7390 } 7391 7392 // This will make the scroll bars inval themselves after 7393 // drawing. We only want this when we're fading so that 7394 // we prevent excessive redraws 7395 invalidate = true; 7396 } else { 7397 // We're just on -- but we may have been fading before so 7398 // reset alpha 7399 cache.scrollBar.setAlpha(255); 7400 } 7401 7402 7403 final int viewFlags = mViewFlags; 7404 7405 final boolean drawHorizontalScrollBar = 7406 (viewFlags & SCROLLBARS_HORIZONTAL) == SCROLLBARS_HORIZONTAL; 7407 final boolean drawVerticalScrollBar = 7408 (viewFlags & SCROLLBARS_VERTICAL) == SCROLLBARS_VERTICAL 7409 && !isVerticalScrollBarHidden(); 7410 7411 if (drawVerticalScrollBar || drawHorizontalScrollBar) { 7412 final int width = mRight - mLeft; 7413 final int height = mBottom - mTop; 7414 7415 final ScrollBarDrawable scrollBar = cache.scrollBar; 7416 int size = scrollBar.getSize(false); 7417 if (size <= 0) { 7418 size = cache.scrollBarSize; 7419 } 7420 7421 final int scrollX = mScrollX; 7422 final int scrollY = mScrollY; 7423 final int inside = (viewFlags & SCROLLBARS_OUTSIDE_MASK) == 0 ? ~0 : 0; 7424 7425 int left, top, right, bottom; 7426 7427 if (drawHorizontalScrollBar) { 7428 scrollBar.setParameters(computeHorizontalScrollRange(), 7429 computeHorizontalScrollOffset(), 7430 computeHorizontalScrollExtent(), false); 7431 final int verticalScrollBarGap = drawVerticalScrollBar ? 7432 getVerticalScrollbarWidth() : 0; 7433 top = scrollY + height - size - (mUserPaddingBottom & inside); 7434 left = scrollX + (mPaddingLeft & inside); 7435 right = scrollX + width - (mUserPaddingRight & inside) - verticalScrollBarGap; 7436 bottom = top + size; 7437 onDrawHorizontalScrollBar(canvas, scrollBar, left, top, right, bottom); 7438 if (invalidate) { 7439 invalidate(left, top, right, bottom); 7440 } 7441 } 7442 7443 if (drawVerticalScrollBar) { 7444 scrollBar.setParameters(computeVerticalScrollRange(), 7445 computeVerticalScrollOffset(), 7446 computeVerticalScrollExtent(), true); 7447 switch (mVerticalScrollbarPosition) { 7448 default: 7449 case SCROLLBAR_POSITION_DEFAULT: 7450 case SCROLLBAR_POSITION_RIGHT: 7451 left = scrollX + width - size - (mUserPaddingRight & inside); 7452 break; 7453 case SCROLLBAR_POSITION_LEFT: 7454 left = scrollX + (mUserPaddingLeft & inside); 7455 break; 7456 } 7457 top = scrollY + (mPaddingTop & inside); 7458 right = left + size; 7459 bottom = scrollY + height - (mUserPaddingBottom & inside); 7460 onDrawVerticalScrollBar(canvas, scrollBar, left, top, right, bottom); 7461 if (invalidate) { 7462 invalidate(left, top, right, bottom); 7463 } 7464 } 7465 } 7466 } 7467 } 7468 7469 /** 7470 * Override this if the vertical scrollbar needs to be hidden in a subclass, like when 7471 * FastScroller is visible. 7472 * @return whether to temporarily hide the vertical scrollbar 7473 * @hide 7474 */ 7475 protected boolean isVerticalScrollBarHidden() { 7476 return false; 7477 } 7478 7479 /** 7480 * <p>Draw the horizontal scrollbar if 7481 * {@link #isHorizontalScrollBarEnabled()} returns true.</p> 7482 * 7483 * @param canvas the canvas on which to draw the scrollbar 7484 * @param scrollBar the scrollbar's drawable 7485 * 7486 * @see #isHorizontalScrollBarEnabled() 7487 * @see #computeHorizontalScrollRange() 7488 * @see #computeHorizontalScrollExtent() 7489 * @see #computeHorizontalScrollOffset() 7490 * @see android.widget.ScrollBarDrawable 7491 * @hide 7492 */ 7493 protected void onDrawHorizontalScrollBar(Canvas canvas, Drawable scrollBar, 7494 int l, int t, int r, int b) { 7495 scrollBar.setBounds(l, t, r, b); 7496 scrollBar.draw(canvas); 7497 } 7498 7499 /** 7500 * <p>Draw the vertical scrollbar if {@link #isVerticalScrollBarEnabled()} 7501 * returns true.</p> 7502 * 7503 * @param canvas the canvas on which to draw the scrollbar 7504 * @param scrollBar the scrollbar's drawable 7505 * 7506 * @see #isVerticalScrollBarEnabled() 7507 * @see #computeVerticalScrollRange() 7508 * @see #computeVerticalScrollExtent() 7509 * @see #computeVerticalScrollOffset() 7510 * @see android.widget.ScrollBarDrawable 7511 * @hide 7512 */ 7513 protected void onDrawVerticalScrollBar(Canvas canvas, Drawable scrollBar, 7514 int l, int t, int r, int b) { 7515 scrollBar.setBounds(l, t, r, b); 7516 scrollBar.draw(canvas); 7517 } 7518 7519 /** 7520 * Implement this to do your drawing. 7521 * 7522 * @param canvas the canvas on which the background will be drawn 7523 */ 7524 protected void onDraw(Canvas canvas) { 7525 } 7526 7527 /* 7528 * Caller is responsible for calling requestLayout if necessary. 7529 * (This allows addViewInLayout to not request a new layout.) 7530 */ 7531 void assignParent(ViewParent parent) { 7532 if (mParent == null) { 7533 mParent = parent; 7534 } else if (parent == null) { 7535 mParent = null; 7536 } else { 7537 throw new RuntimeException("view " + this + " being added, but" 7538 + " it already has a parent"); 7539 } 7540 } 7541 7542 /** 7543 * This is called when the view is attached to a window. At this point it 7544 * has a Surface and will start drawing. Note that this function is 7545 * guaranteed to be called before {@link #onDraw}, however it may be called 7546 * any time before the first onDraw -- including before or after 7547 * {@link #onMeasure}. 7548 * 7549 * @see #onDetachedFromWindow() 7550 */ 7551 protected void onAttachedToWindow() { 7552 if ((mPrivateFlags & REQUEST_TRANSPARENT_REGIONS) != 0) { 7553 mParent.requestTransparentRegion(this); 7554 } 7555 if ((mPrivateFlags & AWAKEN_SCROLL_BARS_ON_ATTACH) != 0) { 7556 initialAwakenScrollBars(); 7557 mPrivateFlags &= ~AWAKEN_SCROLL_BARS_ON_ATTACH; 7558 } 7559 jumpDrawablesToCurrentState(); 7560 } 7561 7562 /** 7563 * This is called when the view is detached from a window. At this point it 7564 * no longer has a surface for drawing. 7565 * 7566 * @see #onAttachedToWindow() 7567 */ 7568 protected void onDetachedFromWindow() { 7569 mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; 7570 7571 removeUnsetPressCallback(); 7572 removeLongPressCallback(); 7573 7574 destroyDrawingCache(); 7575 7576 if (mHardwareLayer != null) { 7577 mHardwareLayer.destroy(); 7578 mHardwareLayer = null; 7579 } 7580 } 7581 7582 /** 7583 * @return The number of times this view has been attached to a window 7584 */ 7585 protected int getWindowAttachCount() { 7586 return mWindowAttachCount; 7587 } 7588 7589 /** 7590 * Retrieve a unique token identifying the window this view is attached to. 7591 * @return Return the window's token for use in 7592 * {@link WindowManager.LayoutParams#token WindowManager.LayoutParams.token}. 7593 */ 7594 public IBinder getWindowToken() { 7595 return mAttachInfo != null ? mAttachInfo.mWindowToken : null; 7596 } 7597 7598 /** 7599 * Retrieve a unique token identifying the top-level "real" window of 7600 * the window that this view is attached to. That is, this is like 7601 * {@link #getWindowToken}, except if the window this view in is a panel 7602 * window (attached to another containing window), then the token of 7603 * the containing window is returned instead. 7604 * 7605 * @return Returns the associated window token, either 7606 * {@link #getWindowToken()} or the containing window's token. 7607 */ 7608 public IBinder getApplicationWindowToken() { 7609 AttachInfo ai = mAttachInfo; 7610 if (ai != null) { 7611 IBinder appWindowToken = ai.mPanelParentWindowToken; 7612 if (appWindowToken == null) { 7613 appWindowToken = ai.mWindowToken; 7614 } 7615 return appWindowToken; 7616 } 7617 return null; 7618 } 7619 7620 /** 7621 * Retrieve private session object this view hierarchy is using to 7622 * communicate with the window manager. 7623 * @return the session object to communicate with the window manager 7624 */ 7625 /*package*/ IWindowSession getWindowSession() { 7626 return mAttachInfo != null ? mAttachInfo.mSession : null; 7627 } 7628 7629 /** 7630 * @param info the {@link android.view.View.AttachInfo} to associated with 7631 * this view 7632 */ 7633 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 7634 //System.out.println("Attached! " + this); 7635 mAttachInfo = info; 7636 mWindowAttachCount++; 7637 // We will need to evaluate the drawable state at least once. 7638 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 7639 if (mFloatingTreeObserver != null) { 7640 info.mTreeObserver.merge(mFloatingTreeObserver); 7641 mFloatingTreeObserver = null; 7642 } 7643 if ((mPrivateFlags&SCROLL_CONTAINER) != 0) { 7644 mAttachInfo.mScrollContainers.add(this); 7645 mPrivateFlags |= SCROLL_CONTAINER_ADDED; 7646 } 7647 performCollectViewAttributes(visibility); 7648 onAttachedToWindow(); 7649 int vis = info.mWindowVisibility; 7650 if (vis != GONE) { 7651 onWindowVisibilityChanged(vis); 7652 } 7653 if ((mPrivateFlags&DRAWABLE_STATE_DIRTY) != 0) { 7654 // If nobody has evaluated the drawable state yet, then do it now. 7655 refreshDrawableState(); 7656 } 7657 } 7658 7659 void dispatchDetachedFromWindow() { 7660 //System.out.println("Detached! " + this); 7661 AttachInfo info = mAttachInfo; 7662 if (info != null) { 7663 int vis = info.mWindowVisibility; 7664 if (vis != GONE) { 7665 onWindowVisibilityChanged(GONE); 7666 } 7667 } 7668 7669 onDetachedFromWindow(); 7670 if ((mPrivateFlags&SCROLL_CONTAINER_ADDED) != 0) { 7671 mAttachInfo.mScrollContainers.remove(this); 7672 mPrivateFlags &= ~SCROLL_CONTAINER_ADDED; 7673 } 7674 mAttachInfo = null; 7675 } 7676 7677 /** 7678 * Store this view hierarchy's frozen state into the given container. 7679 * 7680 * @param container The SparseArray in which to save the view's state. 7681 * 7682 * @see #restoreHierarchyState 7683 * @see #dispatchSaveInstanceState 7684 * @see #onSaveInstanceState 7685 */ 7686 public void saveHierarchyState(SparseArray<Parcelable> container) { 7687 dispatchSaveInstanceState(container); 7688 } 7689 7690 /** 7691 * Called by {@link #saveHierarchyState} to store the state for this view and its children. 7692 * May be overridden to modify how freezing happens to a view's children; for example, some 7693 * views may want to not store state for their children. 7694 * 7695 * @param container The SparseArray in which to save the view's state. 7696 * 7697 * @see #dispatchRestoreInstanceState 7698 * @see #saveHierarchyState 7699 * @see #onSaveInstanceState 7700 */ 7701 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 7702 if (mID != NO_ID && (mViewFlags & SAVE_DISABLED_MASK) == 0) { 7703 mPrivateFlags &= ~SAVE_STATE_CALLED; 7704 Parcelable state = onSaveInstanceState(); 7705 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7706 throw new IllegalStateException( 7707 "Derived class did not call super.onSaveInstanceState()"); 7708 } 7709 if (state != null) { 7710 // Log.i("View", "Freezing #" + Integer.toHexString(mID) 7711 // + ": " + state); 7712 container.put(mID, state); 7713 } 7714 } 7715 } 7716 7717 /** 7718 * Hook allowing a view to generate a representation of its internal state 7719 * that can later be used to create a new instance with that same state. 7720 * This state should only contain information that is not persistent or can 7721 * not be reconstructed later. For example, you will never store your 7722 * current position on screen because that will be computed again when a 7723 * new instance of the view is placed in its view hierarchy. 7724 * <p> 7725 * Some examples of things you may store here: the current cursor position 7726 * in a text view (but usually not the text itself since that is stored in a 7727 * content provider or other persistent storage), the currently selected 7728 * item in a list view. 7729 * 7730 * @return Returns a Parcelable object containing the view's current dynamic 7731 * state, or null if there is nothing interesting to save. The 7732 * default implementation returns null. 7733 * @see #onRestoreInstanceState 7734 * @see #saveHierarchyState 7735 * @see #dispatchSaveInstanceState 7736 * @see #setSaveEnabled(boolean) 7737 */ 7738 protected Parcelable onSaveInstanceState() { 7739 mPrivateFlags |= SAVE_STATE_CALLED; 7740 return BaseSavedState.EMPTY_STATE; 7741 } 7742 7743 /** 7744 * Restore this view hierarchy's frozen state from the given container. 7745 * 7746 * @param container The SparseArray which holds previously frozen states. 7747 * 7748 * @see #saveHierarchyState 7749 * @see #dispatchRestoreInstanceState 7750 * @see #onRestoreInstanceState 7751 */ 7752 public void restoreHierarchyState(SparseArray<Parcelable> container) { 7753 dispatchRestoreInstanceState(container); 7754 } 7755 7756 /** 7757 * Called by {@link #restoreHierarchyState} to retrieve the state for this view and its 7758 * children. May be overridden to modify how restoreing happens to a view's children; for 7759 * example, some views may want to not store state for their children. 7760 * 7761 * @param container The SparseArray which holds previously saved state. 7762 * 7763 * @see #dispatchSaveInstanceState 7764 * @see #restoreHierarchyState 7765 * @see #onRestoreInstanceState 7766 */ 7767 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 7768 if (mID != NO_ID) { 7769 Parcelable state = container.get(mID); 7770 if (state != null) { 7771 // Log.i("View", "Restoreing #" + Integer.toHexString(mID) 7772 // + ": " + state); 7773 mPrivateFlags &= ~SAVE_STATE_CALLED; 7774 onRestoreInstanceState(state); 7775 if ((mPrivateFlags & SAVE_STATE_CALLED) == 0) { 7776 throw new IllegalStateException( 7777 "Derived class did not call super.onRestoreInstanceState()"); 7778 } 7779 } 7780 } 7781 } 7782 7783 /** 7784 * Hook allowing a view to re-apply a representation of its internal state that had previously 7785 * been generated by {@link #onSaveInstanceState}. This function will never be called with a 7786 * null state. 7787 * 7788 * @param state The frozen state that had previously been returned by 7789 * {@link #onSaveInstanceState}. 7790 * 7791 * @see #onSaveInstanceState 7792 * @see #restoreHierarchyState 7793 * @see #dispatchRestoreInstanceState 7794 */ 7795 protected void onRestoreInstanceState(Parcelable state) { 7796 mPrivateFlags |= SAVE_STATE_CALLED; 7797 if (state != BaseSavedState.EMPTY_STATE && state != null) { 7798 throw new IllegalArgumentException("Wrong state class, expecting View State but " 7799 + "received " + state.getClass().toString() + " instead. This usually happens " 7800 + "when two views of different type have the same id in the same hierarchy. " 7801 + "This view's id is " + ViewDebug.resolveId(mContext, getId()) + ". Make sure " 7802 + "other views do not use the same id."); 7803 } 7804 } 7805 7806 /** 7807 * <p>Return the time at which the drawing of the view hierarchy started.</p> 7808 * 7809 * @return the drawing start time in milliseconds 7810 */ 7811 public long getDrawingTime() { 7812 return mAttachInfo != null ? mAttachInfo.mDrawingTime : 0; 7813 } 7814 7815 /** 7816 * <p>Enables or disables the duplication of the parent's state into this view. When 7817 * duplication is enabled, this view gets its drawable state from its parent rather 7818 * than from its own internal properties.</p> 7819 * 7820 * <p>Note: in the current implementation, setting this property to true after the 7821 * view was added to a ViewGroup might have no effect at all. This property should 7822 * always be used from XML or set to true before adding this view to a ViewGroup.</p> 7823 * 7824 * <p>Note: if this view's parent addStateFromChildren property is enabled and this 7825 * property is enabled, an exception will be thrown.</p> 7826 * 7827 * <p>Note: if the child view uses and updates additionnal states which are unknown to the 7828 * parent, these states should not be affected by this method.</p> 7829 * 7830 * @param enabled True to enable duplication of the parent's drawable state, false 7831 * to disable it. 7832 * 7833 * @see #getDrawableState() 7834 * @see #isDuplicateParentStateEnabled() 7835 */ 7836 public void setDuplicateParentStateEnabled(boolean enabled) { 7837 setFlags(enabled ? DUPLICATE_PARENT_STATE : 0, DUPLICATE_PARENT_STATE); 7838 } 7839 7840 /** 7841 * <p>Indicates whether this duplicates its drawable state from its parent.</p> 7842 * 7843 * @return True if this view's drawable state is duplicated from the parent, 7844 * false otherwise 7845 * 7846 * @see #getDrawableState() 7847 * @see #setDuplicateParentStateEnabled(boolean) 7848 */ 7849 public boolean isDuplicateParentStateEnabled() { 7850 return (mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE; 7851 } 7852 7853 /** 7854 * <p>Specifies the type of layer backing this view. The layer can be 7855 * {@link #LAYER_TYPE_NONE disabled}, {@link #LAYER_TYPE_SOFTWARE software} or 7856 * {@link #LAYER_TYPE_HARDWARE hardware}.</p> 7857 * 7858 * <p>A layer is associated with an optional {@link android.graphics.Paint} 7859 * instance that controls how the layer is composed on screen. The following 7860 * properties of the paint are taken into account when composing the layer:</p> 7861 * <ul> 7862 * <li>{@link android.graphics.Paint#getAlpha() Translucency (alpha)}</li> 7863 * <li>{@link android.graphics.Paint#getXfermode() Blending mode}</li> 7864 * <li>{@link android.graphics.Paint#getColorFilter() Color filter}</li> 7865 * </ul> 7866 * 7867 * <p>If this view has an alpha value set to < 1.0 by calling 7868 * {@link #setAlpha(float)}, the alpha value of the layer's paint is replaced by 7869 * this view's alpha value. Calling {@link #setAlpha(float)} is therefore 7870 * equivalent to setting a hardware layer on this view and providing a paint with 7871 * the desired alpha value.<p> 7872 * 7873 * <p>Refer to the documentation of {@link #LAYER_TYPE_NONE disabled}, 7874 * {@link #LAYER_TYPE_SOFTWARE software} and {@link #LAYER_TYPE_HARDWARE hardware} 7875 * for more information on when and how to use layers.</p> 7876 * 7877 * @param layerType The ype of layer to use with this view, must be one of 7878 * {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 7879 * {@link #LAYER_TYPE_HARDWARE} 7880 * @param paint The paint used to compose the layer. This argument is optional 7881 * and can be null. It is ignored when the layer type is 7882 * {@link #LAYER_TYPE_NONE} 7883 * 7884 * @see #getLayerType() 7885 * @see #LAYER_TYPE_NONE 7886 * @see #LAYER_TYPE_SOFTWARE 7887 * @see #LAYER_TYPE_HARDWARE 7888 * @see #setAlpha(float) 7889 * 7890 * @attr ref android.R.styleable#View_layerType 7891 */ 7892 public void setLayerType(int layerType, Paint paint) { 7893 if (layerType < LAYER_TYPE_NONE || layerType > LAYER_TYPE_HARDWARE) { 7894 throw new IllegalArgumentException("Layer type can only be one of: LAYER_TYPE_NONE, " 7895 + "LAYER_TYPE_SOFTWARE or LAYER_TYPE_HARDWARE"); 7896 } 7897 7898 if (layerType == mLayerType) return; 7899 7900 // Destroy any previous software drawing cache if needed 7901 switch (mLayerType) { 7902 case LAYER_TYPE_SOFTWARE: 7903 if (mDrawingCache != null) { 7904 mDrawingCache.recycle(); 7905 mDrawingCache = null; 7906 } 7907 7908 if (mUnscaledDrawingCache != null) { 7909 mUnscaledDrawingCache.recycle(); 7910 mUnscaledDrawingCache = null; 7911 } 7912 break; 7913 case LAYER_TYPE_HARDWARE: 7914 if (mHardwareLayer != null) { 7915 mHardwareLayer.destroy(); 7916 mHardwareLayer = null; 7917 } 7918 break; 7919 default: 7920 break; 7921 } 7922 7923 mLayerType = layerType; 7924 mLayerPaint = mLayerType == LAYER_TYPE_NONE ? null : paint; 7925 7926 // TODO: Make sure we invalidate the parent's display list 7927 invalidate(); 7928 } 7929 7930 /** 7931 * Indicates what type of layer is currently associated with this view. By default 7932 * a view does not have a layer, and the layer type is {@link #LAYER_TYPE_NONE}. 7933 * Refer to the documentation of {@link #setLayerType(int, android.graphics.Paint)} 7934 * for more information on the different types of layers. 7935 * 7936 * @return {@link #LAYER_TYPE_NONE}, {@link #LAYER_TYPE_SOFTWARE} or 7937 * {@link #LAYER_TYPE_HARDWARE} 7938 * 7939 * @see #setLayerType(int, android.graphics.Paint) 7940 * @see #LAYER_TYPE_NONE 7941 * @see #LAYER_TYPE_SOFTWARE 7942 * @see #LAYER_TYPE_HARDWARE 7943 */ 7944 public int getLayerType() { 7945 return mLayerType; 7946 } 7947 7948 /** 7949 * <p>Returns a hardware layer that can be used to draw this view again 7950 * without executing its draw method.</p> 7951 * 7952 * @return A HardwareLayer ready to render, or null if an error occurred. 7953 */ 7954 HardwareLayer getHardwareLayer(Canvas currentCanvas) { 7955 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 7956 return null; 7957 } 7958 7959 final int width = mRight - mLeft; 7960 final int height = mBottom - mTop; 7961 7962 if (width == 0 || height == 0) { 7963 return null; 7964 } 7965 7966 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || mHardwareLayer == null) { 7967 if (mHardwareLayer == null) { 7968 mHardwareLayer = mAttachInfo.mHardwareRenderer.createHardwareLayer( 7969 width, height, isOpaque()); 7970 } else if (mHardwareLayer.getWidth() != width || mHardwareLayer.getHeight() != height) { 7971 mHardwareLayer.resize(width, height); 7972 } 7973 7974 final HardwareCanvas canvas = mHardwareLayer.start(currentCanvas); 7975 try { 7976 canvas.setViewport(width, height); 7977 canvas.onPreDraw(); 7978 7979 computeScroll(); 7980 canvas.translate(-mScrollX, -mScrollY); 7981 7982 final int restoreCount = canvas.save(); 7983 7984 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 7985 7986 // Fast path for layouts with no backgrounds 7987 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 7988 mPrivateFlags &= ~DIRTY_MASK; 7989 dispatchDraw(canvas); 7990 } else { 7991 draw(canvas); 7992 } 7993 7994 canvas.restoreToCount(restoreCount); 7995 } finally { 7996 canvas.onPostDraw(); 7997 mHardwareLayer.end(currentCanvas); 7998 } 7999 } 8000 8001 return mHardwareLayer; 8002 } 8003 8004 /** 8005 * <p>Enables or disables the drawing cache. When the drawing cache is enabled, the next call 8006 * to {@link #getDrawingCache()} or {@link #buildDrawingCache()} will draw the view in a 8007 * bitmap. Calling {@link #draw(android.graphics.Canvas)} will not draw from the cache when 8008 * the cache is enabled. To benefit from the cache, you must request the drawing cache by 8009 * calling {@link #getDrawingCache()} and draw it on screen if the returned bitmap is not 8010 * null.</p> 8011 * 8012 * <p>Enabling the drawing cache is similar to 8013 * {@link #setLayerType(int, android.graphics.Paint) setting a layer} when hardware 8014 * acceleration is turned off. When hardware acceleration is turned on enabling the 8015 * drawing cache has either no effect or the cache used at drawing time is not a bitmap. 8016 * This API can however be used to manually generate a bitmap copy of this view.</p> 8017 * 8018 * @param enabled true to enable the drawing cache, false otherwise 8019 * 8020 * @see #isDrawingCacheEnabled() 8021 * @see #getDrawingCache() 8022 * @see #buildDrawingCache() 8023 * @see #setLayerType(int, android.graphics.Paint) 8024 */ 8025 public void setDrawingCacheEnabled(boolean enabled) { 8026 setFlags(enabled ? DRAWING_CACHE_ENABLED : 0, DRAWING_CACHE_ENABLED); 8027 } 8028 8029 /** 8030 * <p>Indicates whether the drawing cache is enabled for this view.</p> 8031 * 8032 * @return true if the drawing cache is enabled 8033 * 8034 * @see #setDrawingCacheEnabled(boolean) 8035 * @see #getDrawingCache() 8036 */ 8037 @ViewDebug.ExportedProperty(category = "drawing") 8038 public boolean isDrawingCacheEnabled() { 8039 return (mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED; 8040 } 8041 8042 /** 8043 * <p>Returns a display list that can be used to draw this view again 8044 * without executing its draw method.</p> 8045 * 8046 * @return A DisplayList ready to replay, or null if caching is not enabled. 8047 */ 8048 DisplayList getDisplayList() { 8049 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8050 return null; 8051 } 8052 if (mAttachInfo == null || mAttachInfo.mHardwareRenderer == null) { 8053 return null; 8054 } 8055 8056 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED && 8057 ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || 8058 mDisplayList == null || !mDisplayList.isValid())) { 8059 8060 if (mDisplayList == null) { 8061 mDisplayList = mAttachInfo.mHardwareRenderer.createDisplayList(); 8062 } 8063 8064 final HardwareCanvas canvas = mDisplayList.start(); 8065 try { 8066 int width = mRight - mLeft; 8067 int height = mBottom - mTop; 8068 8069 canvas.setViewport(width, height); 8070 canvas.onPreDraw(); 8071 8072 final int restoreCount = canvas.save(); 8073 8074 mPrivateFlags |= DRAWN | DRAWING_CACHE_VALID; 8075 8076 // Fast path for layouts with no backgrounds 8077 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8078 mPrivateFlags &= ~DIRTY_MASK; 8079 dispatchDraw(canvas); 8080 } else { 8081 draw(canvas); 8082 } 8083 8084 canvas.restoreToCount(restoreCount); 8085 } finally { 8086 canvas.onPostDraw(); 8087 8088 mDisplayList.end(); 8089 } 8090 } 8091 8092 return mDisplayList; 8093 } 8094 8095 /** 8096 * <p>Calling this method is equivalent to calling <code>getDrawingCache(false)</code>.</p> 8097 * 8098 * @return A non-scaled bitmap representing this view or null if cache is disabled. 8099 * 8100 * @see #getDrawingCache(boolean) 8101 */ 8102 public Bitmap getDrawingCache() { 8103 return getDrawingCache(false); 8104 } 8105 8106 /** 8107 * <p>Returns the bitmap in which this view drawing is cached. The returned bitmap 8108 * is null when caching is disabled. If caching is enabled and the cache is not ready, 8109 * this method will create it. Calling {@link #draw(android.graphics.Canvas)} will not 8110 * draw from the cache when the cache is enabled. To benefit from the cache, you must 8111 * request the drawing cache by calling this method and draw it on screen if the 8112 * returned bitmap is not null.</p> 8113 * 8114 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8115 * this method will create a bitmap of the same size as this view. Because this bitmap 8116 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8117 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8118 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8119 * size than the view. This implies that your application must be able to handle this 8120 * size.</p> 8121 * 8122 * @param autoScale Indicates whether the generated bitmap should be scaled based on 8123 * the current density of the screen when the application is in compatibility 8124 * mode. 8125 * 8126 * @return A bitmap representing this view or null if cache is disabled. 8127 * 8128 * @see #setDrawingCacheEnabled(boolean) 8129 * @see #isDrawingCacheEnabled() 8130 * @see #buildDrawingCache(boolean) 8131 * @see #destroyDrawingCache() 8132 */ 8133 public Bitmap getDrawingCache(boolean autoScale) { 8134 if ((mViewFlags & WILL_NOT_CACHE_DRAWING) == WILL_NOT_CACHE_DRAWING) { 8135 return null; 8136 } 8137 if ((mViewFlags & DRAWING_CACHE_ENABLED) == DRAWING_CACHE_ENABLED) { 8138 buildDrawingCache(autoScale); 8139 } 8140 return autoScale ? mDrawingCache : mUnscaledDrawingCache; 8141 } 8142 8143 /** 8144 * <p>Frees the resources used by the drawing cache. If you call 8145 * {@link #buildDrawingCache()} manually without calling 8146 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8147 * should cleanup the cache with this method afterwards.</p> 8148 * 8149 * @see #setDrawingCacheEnabled(boolean) 8150 * @see #buildDrawingCache() 8151 * @see #getDrawingCache() 8152 */ 8153 public void destroyDrawingCache() { 8154 if (mDrawingCache != null) { 8155 mDrawingCache.recycle(); 8156 mDrawingCache = null; 8157 } 8158 if (mUnscaledDrawingCache != null) { 8159 mUnscaledDrawingCache.recycle(); 8160 mUnscaledDrawingCache = null; 8161 } 8162 if (mDisplayList != null) { 8163 mDisplayList.invalidate(); 8164 } 8165 } 8166 8167 /** 8168 * Setting a solid background color for the drawing cache's bitmaps will improve 8169 * perfromance and memory usage. Note, though that this should only be used if this 8170 * view will always be drawn on top of a solid color. 8171 * 8172 * @param color The background color to use for the drawing cache's bitmap 8173 * 8174 * @see #setDrawingCacheEnabled(boolean) 8175 * @see #buildDrawingCache() 8176 * @see #getDrawingCache() 8177 */ 8178 public void setDrawingCacheBackgroundColor(int color) { 8179 if (color != mDrawingCacheBackgroundColor) { 8180 mDrawingCacheBackgroundColor = color; 8181 mPrivateFlags &= ~DRAWING_CACHE_VALID; 8182 } 8183 } 8184 8185 /** 8186 * @see #setDrawingCacheBackgroundColor(int) 8187 * 8188 * @return The background color to used for the drawing cache's bitmap 8189 */ 8190 public int getDrawingCacheBackgroundColor() { 8191 return mDrawingCacheBackgroundColor; 8192 } 8193 8194 /** 8195 * <p>Calling this method is equivalent to calling <code>buildDrawingCache(false)</code>.</p> 8196 * 8197 * @see #buildDrawingCache(boolean) 8198 */ 8199 public void buildDrawingCache() { 8200 buildDrawingCache(false); 8201 } 8202 8203 /** 8204 * <p>Forces the drawing cache to be built if the drawing cache is invalid.</p> 8205 * 8206 * <p>If you call {@link #buildDrawingCache()} manually without calling 8207 * {@link #setDrawingCacheEnabled(boolean) setDrawingCacheEnabled(true)}, you 8208 * should cleanup the cache by calling {@link #destroyDrawingCache()} afterwards.</p> 8209 * 8210 * <p>Note about auto scaling in compatibility mode: When auto scaling is not enabled, 8211 * this method will create a bitmap of the same size as this view. Because this bitmap 8212 * will be drawn scaled by the parent ViewGroup, the result on screen might show 8213 * scaling artifacts. To avoid such artifacts, you should call this method by setting 8214 * the auto scaling to true. Doing so, however, will generate a bitmap of a different 8215 * size than the view. This implies that your application must be able to handle this 8216 * size.</p> 8217 * 8218 * <p>You should avoid calling this method when hardware acceleration is enabled. If 8219 * you do not need the drawing cache bitmap, calling this method will increase memory 8220 * usage and cause the view to be rendered in software once, thus negatively impacting 8221 * performance.</p> 8222 * 8223 * @see #getDrawingCache() 8224 * @see #destroyDrawingCache() 8225 */ 8226 public void buildDrawingCache(boolean autoScale) { 8227 if ((mPrivateFlags & DRAWING_CACHE_VALID) == 0 || (autoScale ? 8228 mDrawingCache == null : mUnscaledDrawingCache == null)) { 8229 8230 if (ViewDebug.TRACE_HIERARCHY) { 8231 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.BUILD_CACHE); 8232 } 8233 8234 int width = mRight - mLeft; 8235 int height = mBottom - mTop; 8236 8237 final AttachInfo attachInfo = mAttachInfo; 8238 final boolean scalingRequired = attachInfo != null && attachInfo.mScalingRequired; 8239 8240 if (autoScale && scalingRequired) { 8241 width = (int) ((width * attachInfo.mApplicationScale) + 0.5f); 8242 height = (int) ((height * attachInfo.mApplicationScale) + 0.5f); 8243 } 8244 8245 final int drawingCacheBackgroundColor = mDrawingCacheBackgroundColor; 8246 final boolean opaque = drawingCacheBackgroundColor != 0 || isOpaque(); 8247 final boolean use32BitCache = attachInfo != null && attachInfo.mUse32BitDrawingCache; 8248 8249 if (width <= 0 || height <= 0 || 8250 // Projected bitmap size in bytes 8251 (width * height * (opaque && !use32BitCache ? 2 : 4) > 8252 ViewConfiguration.get(mContext).getScaledMaximumDrawingCacheSize())) { 8253 destroyDrawingCache(); 8254 return; 8255 } 8256 8257 boolean clear = true; 8258 Bitmap bitmap = autoScale ? mDrawingCache : mUnscaledDrawingCache; 8259 8260 if (bitmap == null || bitmap.getWidth() != width || bitmap.getHeight() != height) { 8261 Bitmap.Config quality; 8262 if (!opaque) { 8263 switch (mViewFlags & DRAWING_CACHE_QUALITY_MASK) { 8264 case DRAWING_CACHE_QUALITY_AUTO: 8265 quality = Bitmap.Config.ARGB_8888; 8266 break; 8267 case DRAWING_CACHE_QUALITY_LOW: 8268 quality = Bitmap.Config.ARGB_4444; 8269 break; 8270 case DRAWING_CACHE_QUALITY_HIGH: 8271 quality = Bitmap.Config.ARGB_8888; 8272 break; 8273 default: 8274 quality = Bitmap.Config.ARGB_8888; 8275 break; 8276 } 8277 } else { 8278 // Optimization for translucent windows 8279 // If the window is translucent, use a 32 bits bitmap to benefit from memcpy() 8280 quality = use32BitCache ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565; 8281 } 8282 8283 // Try to cleanup memory 8284 if (bitmap != null) bitmap.recycle(); 8285 8286 try { 8287 bitmap = Bitmap.createBitmap(width, height, quality); 8288 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8289 if (autoScale) { 8290 mDrawingCache = bitmap; 8291 } else { 8292 mUnscaledDrawingCache = bitmap; 8293 } 8294 if (opaque && use32BitCache) bitmap.setHasAlpha(false); 8295 } catch (OutOfMemoryError e) { 8296 // If there is not enough memory to create the bitmap cache, just 8297 // ignore the issue as bitmap caches are not required to draw the 8298 // view hierarchy 8299 if (autoScale) { 8300 mDrawingCache = null; 8301 } else { 8302 mUnscaledDrawingCache = null; 8303 } 8304 return; 8305 } 8306 8307 clear = drawingCacheBackgroundColor != 0; 8308 } 8309 8310 Canvas canvas; 8311 if (attachInfo != null) { 8312 canvas = attachInfo.mCanvas; 8313 if (canvas == null) { 8314 canvas = new Canvas(); 8315 } 8316 canvas.setBitmap(bitmap); 8317 // Temporarily clobber the cached Canvas in case one of our children 8318 // is also using a drawing cache. Without this, the children would 8319 // steal the canvas by attaching their own bitmap to it and bad, bad 8320 // thing would happen (invisible views, corrupted drawings, etc.) 8321 attachInfo.mCanvas = null; 8322 } else { 8323 // This case should hopefully never or seldom happen 8324 canvas = new Canvas(bitmap); 8325 } 8326 8327 if (clear) { 8328 bitmap.eraseColor(drawingCacheBackgroundColor); 8329 } 8330 8331 computeScroll(); 8332 final int restoreCount = canvas.save(); 8333 8334 if (autoScale && scalingRequired) { 8335 final float scale = attachInfo.mApplicationScale; 8336 canvas.scale(scale, scale); 8337 } 8338 8339 canvas.translate(-mScrollX, -mScrollY); 8340 8341 mPrivateFlags |= DRAWN; 8342 if (mAttachInfo == null || !mAttachInfo.mHardwareAccelerated || 8343 mLayerType != LAYER_TYPE_NONE) { 8344 mPrivateFlags |= DRAWING_CACHE_VALID; 8345 } 8346 8347 // Fast path for layouts with no backgrounds 8348 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8349 if (ViewDebug.TRACE_HIERARCHY) { 8350 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8351 } 8352 mPrivateFlags &= ~DIRTY_MASK; 8353 dispatchDraw(canvas); 8354 } else { 8355 draw(canvas); 8356 } 8357 8358 canvas.restoreToCount(restoreCount); 8359 8360 if (attachInfo != null) { 8361 // Restore the cached Canvas for our siblings 8362 attachInfo.mCanvas = canvas; 8363 } 8364 } 8365 } 8366 8367 /** 8368 * Create a snapshot of the view into a bitmap. We should probably make 8369 * some form of this public, but should think about the API. 8370 */ 8371 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 8372 int width = mRight - mLeft; 8373 int height = mBottom - mTop; 8374 8375 final AttachInfo attachInfo = mAttachInfo; 8376 final float scale = attachInfo != null ? attachInfo.mApplicationScale : 1.0f; 8377 width = (int) ((width * scale) + 0.5f); 8378 height = (int) ((height * scale) + 0.5f); 8379 8380 Bitmap bitmap = Bitmap.createBitmap(width > 0 ? width : 1, height > 0 ? height : 1, quality); 8381 if (bitmap == null) { 8382 throw new OutOfMemoryError(); 8383 } 8384 8385 bitmap.setDensity(getResources().getDisplayMetrics().densityDpi); 8386 8387 Canvas canvas; 8388 if (attachInfo != null) { 8389 canvas = attachInfo.mCanvas; 8390 if (canvas == null) { 8391 canvas = new Canvas(); 8392 } 8393 canvas.setBitmap(bitmap); 8394 // Temporarily clobber the cached Canvas in case one of our children 8395 // is also using a drawing cache. Without this, the children would 8396 // steal the canvas by attaching their own bitmap to it and bad, bad 8397 // things would happen (invisible views, corrupted drawings, etc.) 8398 attachInfo.mCanvas = null; 8399 } else { 8400 // This case should hopefully never or seldom happen 8401 canvas = new Canvas(bitmap); 8402 } 8403 8404 if ((backgroundColor & 0xff000000) != 0) { 8405 bitmap.eraseColor(backgroundColor); 8406 } 8407 8408 computeScroll(); 8409 final int restoreCount = canvas.save(); 8410 canvas.scale(scale, scale); 8411 canvas.translate(-mScrollX, -mScrollY); 8412 8413 // Temporarily remove the dirty mask 8414 int flags = mPrivateFlags; 8415 mPrivateFlags &= ~DIRTY_MASK; 8416 8417 // Fast path for layouts with no backgrounds 8418 if ((mPrivateFlags & SKIP_DRAW) == SKIP_DRAW) { 8419 dispatchDraw(canvas); 8420 } else { 8421 draw(canvas); 8422 } 8423 8424 mPrivateFlags = flags; 8425 8426 canvas.restoreToCount(restoreCount); 8427 8428 if (attachInfo != null) { 8429 // Restore the cached Canvas for our siblings 8430 attachInfo.mCanvas = canvas; 8431 } 8432 8433 return bitmap; 8434 } 8435 8436 /** 8437 * Indicates whether this View is currently in edit mode. A View is usually 8438 * in edit mode when displayed within a developer tool. For instance, if 8439 * this View is being drawn by a visual user interface builder, this method 8440 * should return true. 8441 * 8442 * Subclasses should check the return value of this method to provide 8443 * different behaviors if their normal behavior might interfere with the 8444 * host environment. For instance: the class spawns a thread in its 8445 * constructor, the drawing code relies on device-specific features, etc. 8446 * 8447 * This method is usually checked in the drawing code of custom widgets. 8448 * 8449 * @return True if this View is in edit mode, false otherwise. 8450 */ 8451 public boolean isInEditMode() { 8452 return false; 8453 } 8454 8455 /** 8456 * If the View draws content inside its padding and enables fading edges, 8457 * it needs to support padding offsets. Padding offsets are added to the 8458 * fading edges to extend the length of the fade so that it covers pixels 8459 * drawn inside the padding. 8460 * 8461 * Subclasses of this class should override this method if they need 8462 * to draw content inside the padding. 8463 * 8464 * @return True if padding offset must be applied, false otherwise. 8465 * 8466 * @see #getLeftPaddingOffset() 8467 * @see #getRightPaddingOffset() 8468 * @see #getTopPaddingOffset() 8469 * @see #getBottomPaddingOffset() 8470 * 8471 * @since CURRENT 8472 */ 8473 protected boolean isPaddingOffsetRequired() { 8474 return false; 8475 } 8476 8477 /** 8478 * Amount by which to extend the left fading region. Called only when 8479 * {@link #isPaddingOffsetRequired()} returns true. 8480 * 8481 * @return The left padding offset in pixels. 8482 * 8483 * @see #isPaddingOffsetRequired() 8484 * 8485 * @since CURRENT 8486 */ 8487 protected int getLeftPaddingOffset() { 8488 return 0; 8489 } 8490 8491 /** 8492 * Amount by which to extend the right fading region. Called only when 8493 * {@link #isPaddingOffsetRequired()} returns true. 8494 * 8495 * @return The right padding offset in pixels. 8496 * 8497 * @see #isPaddingOffsetRequired() 8498 * 8499 * @since CURRENT 8500 */ 8501 protected int getRightPaddingOffset() { 8502 return 0; 8503 } 8504 8505 /** 8506 * Amount by which to extend the top fading region. Called only when 8507 * {@link #isPaddingOffsetRequired()} returns true. 8508 * 8509 * @return The top padding offset in pixels. 8510 * 8511 * @see #isPaddingOffsetRequired() 8512 * 8513 * @since CURRENT 8514 */ 8515 protected int getTopPaddingOffset() { 8516 return 0; 8517 } 8518 8519 /** 8520 * Amount by which to extend the bottom fading region. Called only when 8521 * {@link #isPaddingOffsetRequired()} returns true. 8522 * 8523 * @return The bottom padding offset in pixels. 8524 * 8525 * @see #isPaddingOffsetRequired() 8526 * 8527 * @since CURRENT 8528 */ 8529 protected int getBottomPaddingOffset() { 8530 return 0; 8531 } 8532 8533 /** 8534 * <p>Indicates whether this view is attached to an hardware accelerated 8535 * window or not.</p> 8536 * 8537 * <p>Even if this method returns true, it does not mean that every call 8538 * to {@link #draw(android.graphics.Canvas)} will be made with an hardware 8539 * accelerated {@link android.graphics.Canvas}. For instance, if this view 8540 * is drawn onto an offscren {@link android.graphics.Bitmap} and its 8541 * window is hardware accelerated, 8542 * {@link android.graphics.Canvas#isHardwareAccelerated()} will likely 8543 * return false, and this method will return true.</p> 8544 * 8545 * @return True if the view is attached to a window and the window is 8546 * hardware accelerated; false in any other case. 8547 */ 8548 public boolean isHardwareAccelerated() { 8549 return mAttachInfo != null && mAttachInfo.mHardwareAccelerated; 8550 } 8551 8552 /** 8553 * Manually render this view (and all of its children) to the given Canvas. 8554 * The view must have already done a full layout before this function is 8555 * called. When implementing a view, implement {@link #onDraw} instead of 8556 * overriding this method. If you do need to override this method, call 8557 * the superclass version. 8558 * 8559 * @param canvas The Canvas to which the View is rendered. 8560 */ 8561 public void draw(Canvas canvas) { 8562 if (ViewDebug.TRACE_HIERARCHY) { 8563 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.DRAW); 8564 } 8565 8566 final int privateFlags = mPrivateFlags; 8567 final boolean dirtyOpaque = (privateFlags & DIRTY_MASK) == DIRTY_OPAQUE && 8568 (mAttachInfo == null || !mAttachInfo.mIgnoreDirtyState); 8569 mPrivateFlags = (privateFlags & ~DIRTY_MASK) | DRAWN; 8570 8571 /* 8572 * Draw traversal performs several drawing steps which must be executed 8573 * in the appropriate order: 8574 * 8575 * 1. Draw the background 8576 * 2. If necessary, save the canvas' layers to prepare for fading 8577 * 3. Draw view's content 8578 * 4. Draw children 8579 * 5. If necessary, draw the fading edges and restore layers 8580 * 6. Draw decorations (scrollbars for instance) 8581 */ 8582 8583 // Step 1, draw the background, if needed 8584 int saveCount; 8585 8586 if (!dirtyOpaque) { 8587 final Drawable background = mBGDrawable; 8588 if (background != null) { 8589 final int scrollX = mScrollX; 8590 final int scrollY = mScrollY; 8591 8592 if (mBackgroundSizeChanged) { 8593 background.setBounds(0, 0, mRight - mLeft, mBottom - mTop); 8594 mBackgroundSizeChanged = false; 8595 } 8596 8597 if ((scrollX | scrollY) == 0) { 8598 background.draw(canvas); 8599 } else { 8600 canvas.translate(scrollX, scrollY); 8601 background.draw(canvas); 8602 canvas.translate(-scrollX, -scrollY); 8603 } 8604 } 8605 } 8606 8607 // skip step 2 & 5 if possible (common case) 8608 final int viewFlags = mViewFlags; 8609 boolean horizontalEdges = (viewFlags & FADING_EDGE_HORIZONTAL) != 0; 8610 boolean verticalEdges = (viewFlags & FADING_EDGE_VERTICAL) != 0; 8611 if (!verticalEdges && !horizontalEdges) { 8612 // Step 3, draw the content 8613 if (!dirtyOpaque) onDraw(canvas); 8614 8615 // Step 4, draw the children 8616 dispatchDraw(canvas); 8617 8618 // Step 6, draw decorations (scrollbars) 8619 onDrawScrollBars(canvas); 8620 8621 // we're done... 8622 return; 8623 } 8624 8625 /* 8626 * Here we do the full fledged routine... 8627 * (this is an uncommon case where speed matters less, 8628 * this is why we repeat some of the tests that have been 8629 * done above) 8630 */ 8631 8632 boolean drawTop = false; 8633 boolean drawBottom = false; 8634 boolean drawLeft = false; 8635 boolean drawRight = false; 8636 8637 float topFadeStrength = 0.0f; 8638 float bottomFadeStrength = 0.0f; 8639 float leftFadeStrength = 0.0f; 8640 float rightFadeStrength = 0.0f; 8641 8642 // Step 2, save the canvas' layers 8643 int paddingLeft = mPaddingLeft; 8644 int paddingTop = mPaddingTop; 8645 8646 final boolean offsetRequired = isPaddingOffsetRequired(); 8647 if (offsetRequired) { 8648 paddingLeft += getLeftPaddingOffset(); 8649 paddingTop += getTopPaddingOffset(); 8650 } 8651 8652 int left = mScrollX + paddingLeft; 8653 int right = left + mRight - mLeft - mPaddingRight - paddingLeft; 8654 int top = mScrollY + paddingTop; 8655 int bottom = top + mBottom - mTop - mPaddingBottom - paddingTop; 8656 8657 if (offsetRequired) { 8658 right += getRightPaddingOffset(); 8659 bottom += getBottomPaddingOffset(); 8660 } 8661 8662 final ScrollabilityCache scrollabilityCache = mScrollCache; 8663 int length = scrollabilityCache.fadingEdgeLength; 8664 8665 // clip the fade length if top and bottom fades overlap 8666 // overlapping fades produce odd-looking artifacts 8667 if (verticalEdges && (top + length > bottom - length)) { 8668 length = (bottom - top) / 2; 8669 } 8670 8671 // also clip horizontal fades if necessary 8672 if (horizontalEdges && (left + length > right - length)) { 8673 length = (right - left) / 2; 8674 } 8675 8676 if (verticalEdges) { 8677 topFadeStrength = Math.max(0.0f, Math.min(1.0f, getTopFadingEdgeStrength())); 8678 drawTop = topFadeStrength > 0.0f; 8679 bottomFadeStrength = Math.max(0.0f, Math.min(1.0f, getBottomFadingEdgeStrength())); 8680 drawBottom = bottomFadeStrength > 0.0f; 8681 } 8682 8683 if (horizontalEdges) { 8684 leftFadeStrength = Math.max(0.0f, Math.min(1.0f, getLeftFadingEdgeStrength())); 8685 drawLeft = leftFadeStrength > 0.0f; 8686 rightFadeStrength = Math.max(0.0f, Math.min(1.0f, getRightFadingEdgeStrength())); 8687 drawRight = rightFadeStrength > 0.0f; 8688 } 8689 8690 saveCount = canvas.getSaveCount(); 8691 8692 int solidColor = getSolidColor(); 8693 if (solidColor == 0) { 8694 final int flags = Canvas.HAS_ALPHA_LAYER_SAVE_FLAG; 8695 8696 if (drawTop) { 8697 canvas.saveLayer(left, top, right, top + length, null, flags); 8698 } 8699 8700 if (drawBottom) { 8701 canvas.saveLayer(left, bottom - length, right, bottom, null, flags); 8702 } 8703 8704 if (drawLeft) { 8705 canvas.saveLayer(left, top, left + length, bottom, null, flags); 8706 } 8707 8708 if (drawRight) { 8709 canvas.saveLayer(right - length, top, right, bottom, null, flags); 8710 } 8711 } else { 8712 scrollabilityCache.setFadeColor(solidColor); 8713 } 8714 8715 // Step 3, draw the content 8716 if (!dirtyOpaque) onDraw(canvas); 8717 8718 // Step 4, draw the children 8719 dispatchDraw(canvas); 8720 8721 // Step 5, draw the fade effect and restore layers 8722 final Paint p = scrollabilityCache.paint; 8723 final Matrix matrix = scrollabilityCache.matrix; 8724 final Shader fade = scrollabilityCache.shader; 8725 final float fadeHeight = scrollabilityCache.fadingEdgeLength; 8726 8727 if (drawTop) { 8728 matrix.setScale(1, fadeHeight * topFadeStrength); 8729 matrix.postTranslate(left, top); 8730 fade.setLocalMatrix(matrix); 8731 canvas.drawRect(left, top, right, top + length, p); 8732 } 8733 8734 if (drawBottom) { 8735 matrix.setScale(1, fadeHeight * bottomFadeStrength); 8736 matrix.postRotate(180); 8737 matrix.postTranslate(left, bottom); 8738 fade.setLocalMatrix(matrix); 8739 canvas.drawRect(left, bottom - length, right, bottom, p); 8740 } 8741 8742 if (drawLeft) { 8743 matrix.setScale(1, fadeHeight * leftFadeStrength); 8744 matrix.postRotate(-90); 8745 matrix.postTranslate(left, top); 8746 fade.setLocalMatrix(matrix); 8747 canvas.drawRect(left, top, left + length, bottom, p); 8748 } 8749 8750 if (drawRight) { 8751 matrix.setScale(1, fadeHeight * rightFadeStrength); 8752 matrix.postRotate(90); 8753 matrix.postTranslate(right, top); 8754 fade.setLocalMatrix(matrix); 8755 canvas.drawRect(right - length, top, right, bottom, p); 8756 } 8757 8758 canvas.restoreToCount(saveCount); 8759 8760 // Step 6, draw decorations (scrollbars) 8761 onDrawScrollBars(canvas); 8762 } 8763 8764 /** 8765 * Override this if your view is known to always be drawn on top of a solid color background, 8766 * and needs to draw fading edges. Returning a non-zero color enables the view system to 8767 * optimize the drawing of the fading edges. If you do return a non-zero color, the alpha 8768 * should be set to 0xFF. 8769 * 8770 * @see #setVerticalFadingEdgeEnabled 8771 * @see #setHorizontalFadingEdgeEnabled 8772 * 8773 * @return The known solid color background for this view, or 0 if the color may vary 8774 */ 8775 public int getSolidColor() { 8776 return 0; 8777 } 8778 8779 /** 8780 * Build a human readable string representation of the specified view flags. 8781 * 8782 * @param flags the view flags to convert to a string 8783 * @return a String representing the supplied flags 8784 */ 8785 private static String printFlags(int flags) { 8786 String output = ""; 8787 int numFlags = 0; 8788 if ((flags & FOCUSABLE_MASK) == FOCUSABLE) { 8789 output += "TAKES_FOCUS"; 8790 numFlags++; 8791 } 8792 8793 switch (flags & VISIBILITY_MASK) { 8794 case INVISIBLE: 8795 if (numFlags > 0) { 8796 output += " "; 8797 } 8798 output += "INVISIBLE"; 8799 // USELESS HERE numFlags++; 8800 break; 8801 case GONE: 8802 if (numFlags > 0) { 8803 output += " "; 8804 } 8805 output += "GONE"; 8806 // USELESS HERE numFlags++; 8807 break; 8808 default: 8809 break; 8810 } 8811 return output; 8812 } 8813 8814 /** 8815 * Build a human readable string representation of the specified private 8816 * view flags. 8817 * 8818 * @param privateFlags the private view flags to convert to a string 8819 * @return a String representing the supplied flags 8820 */ 8821 private static String printPrivateFlags(int privateFlags) { 8822 String output = ""; 8823 int numFlags = 0; 8824 8825 if ((privateFlags & WANTS_FOCUS) == WANTS_FOCUS) { 8826 output += "WANTS_FOCUS"; 8827 numFlags++; 8828 } 8829 8830 if ((privateFlags & FOCUSED) == FOCUSED) { 8831 if (numFlags > 0) { 8832 output += " "; 8833 } 8834 output += "FOCUSED"; 8835 numFlags++; 8836 } 8837 8838 if ((privateFlags & SELECTED) == SELECTED) { 8839 if (numFlags > 0) { 8840 output += " "; 8841 } 8842 output += "SELECTED"; 8843 numFlags++; 8844 } 8845 8846 if ((privateFlags & IS_ROOT_NAMESPACE) == IS_ROOT_NAMESPACE) { 8847 if (numFlags > 0) { 8848 output += " "; 8849 } 8850 output += "IS_ROOT_NAMESPACE"; 8851 numFlags++; 8852 } 8853 8854 if ((privateFlags & HAS_BOUNDS) == HAS_BOUNDS) { 8855 if (numFlags > 0) { 8856 output += " "; 8857 } 8858 output += "HAS_BOUNDS"; 8859 numFlags++; 8860 } 8861 8862 if ((privateFlags & DRAWN) == DRAWN) { 8863 if (numFlags > 0) { 8864 output += " "; 8865 } 8866 output += "DRAWN"; 8867 // USELESS HERE numFlags++; 8868 } 8869 return output; 8870 } 8871 8872 /** 8873 * <p>Indicates whether or not this view's layout will be requested during 8874 * the next hierarchy layout pass.</p> 8875 * 8876 * @return true if the layout will be forced during next layout pass 8877 */ 8878 public boolean isLayoutRequested() { 8879 return (mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT; 8880 } 8881 8882 /** 8883 * Assign a size and position to a view and all of its 8884 * descendants 8885 * 8886 * <p>This is the second phase of the layout mechanism. 8887 * (The first is measuring). In this phase, each parent calls 8888 * layout on all of its children to position them. 8889 * This is typically done using the child measurements 8890 * that were stored in the measure pass().</p> 8891 * 8892 * <p>Derived classes should not override this method. 8893 * Derived classes with children should override 8894 * onLayout. In that method, they should 8895 * call layout on each of their children.</p> 8896 * 8897 * @param l Left position, relative to parent 8898 * @param t Top position, relative to parent 8899 * @param r Right position, relative to parent 8900 * @param b Bottom position, relative to parent 8901 */ 8902 @SuppressWarnings({"unchecked"}) 8903 public void layout(int l, int t, int r, int b) { 8904 int oldL = mLeft; 8905 int oldT = mTop; 8906 int oldB = mBottom; 8907 int oldR = mRight; 8908 boolean changed = setFrame(l, t, r, b); 8909 if (changed || (mPrivateFlags & LAYOUT_REQUIRED) == LAYOUT_REQUIRED) { 8910 if (ViewDebug.TRACE_HIERARCHY) { 8911 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_LAYOUT); 8912 } 8913 8914 onLayout(changed, l, t, r, b); 8915 mPrivateFlags &= ~LAYOUT_REQUIRED; 8916 8917 if (mOnLayoutChangeListeners != null) { 8918 ArrayList<OnLayoutChangeListener> listenersCopy = 8919 (ArrayList<OnLayoutChangeListener>) mOnLayoutChangeListeners.clone(); 8920 int numListeners = listenersCopy.size(); 8921 for (int i = 0; i < numListeners; ++i) { 8922 listenersCopy.get(i).onLayoutChange(this, l, t, r, b, oldL, oldT, oldR, oldB); 8923 } 8924 } 8925 } 8926 mPrivateFlags &= ~FORCE_LAYOUT; 8927 } 8928 8929 /** 8930 * Called from layout when this view should 8931 * assign a size and position to each of its children. 8932 * 8933 * Derived classes with children should override 8934 * this method and call layout on each of 8935 * their children. 8936 * @param changed This is a new size or position for this view 8937 * @param left Left position, relative to parent 8938 * @param top Top position, relative to parent 8939 * @param right Right position, relative to parent 8940 * @param bottom Bottom position, relative to parent 8941 */ 8942 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 8943 } 8944 8945 /** 8946 * Assign a size and position to this view. 8947 * 8948 * This is called from layout. 8949 * 8950 * @param left Left position, relative to parent 8951 * @param top Top position, relative to parent 8952 * @param right Right position, relative to parent 8953 * @param bottom Bottom position, relative to parent 8954 * @return true if the new size and position are different than the 8955 * previous ones 8956 * {@hide} 8957 */ 8958 protected boolean setFrame(int left, int top, int right, int bottom) { 8959 boolean changed = false; 8960 8961 if (DBG) { 8962 Log.d("View", this + " View.setFrame(" + left + "," + top + "," 8963 + right + "," + bottom + ")"); 8964 } 8965 8966 if (mLeft != left || mRight != right || mTop != top || mBottom != bottom) { 8967 changed = true; 8968 8969 // Remember our drawn bit 8970 int drawn = mPrivateFlags & DRAWN; 8971 8972 // Invalidate our old position 8973 invalidate(); 8974 8975 8976 int oldWidth = mRight - mLeft; 8977 int oldHeight = mBottom - mTop; 8978 8979 mLeft = left; 8980 mTop = top; 8981 mRight = right; 8982 mBottom = bottom; 8983 8984 mPrivateFlags |= HAS_BOUNDS; 8985 8986 int newWidth = right - left; 8987 int newHeight = bottom - top; 8988 8989 if (newWidth != oldWidth || newHeight != oldHeight) { 8990 if ((mPrivateFlags & PIVOT_EXPLICITLY_SET) == 0) { 8991 // A change in dimension means an auto-centered pivot point changes, too 8992 mMatrixDirty = true; 8993 } 8994 onSizeChanged(newWidth, newHeight, oldWidth, oldHeight); 8995 } 8996 8997 if ((mViewFlags & VISIBILITY_MASK) == VISIBLE) { 8998 // If we are visible, force the DRAWN bit to on so that 8999 // this invalidate will go through (at least to our parent). 9000 // This is because someone may have invalidated this view 9001 // before this call to setFrame came in, thereby clearing 9002 // the DRAWN bit. 9003 mPrivateFlags |= DRAWN; 9004 invalidate(); 9005 } 9006 9007 // Reset drawn bit to original value (invalidate turns it off) 9008 mPrivateFlags |= drawn; 9009 9010 mBackgroundSizeChanged = true; 9011 } 9012 return changed; 9013 } 9014 9015 /** 9016 * Finalize inflating a view from XML. This is called as the last phase 9017 * of inflation, after all child views have been added. 9018 * 9019 * <p>Even if the subclass overrides onFinishInflate, they should always be 9020 * sure to call the super method, so that we get called. 9021 */ 9022 protected void onFinishInflate() { 9023 } 9024 9025 /** 9026 * Returns the resources associated with this view. 9027 * 9028 * @return Resources object. 9029 */ 9030 public Resources getResources() { 9031 return mResources; 9032 } 9033 9034 /** 9035 * Invalidates the specified Drawable. 9036 * 9037 * @param drawable the drawable to invalidate 9038 */ 9039 public void invalidateDrawable(Drawable drawable) { 9040 if (verifyDrawable(drawable)) { 9041 final Rect dirty = drawable.getBounds(); 9042 final int scrollX = mScrollX; 9043 final int scrollY = mScrollY; 9044 9045 invalidate(dirty.left + scrollX, dirty.top + scrollY, 9046 dirty.right + scrollX, dirty.bottom + scrollY); 9047 } 9048 } 9049 9050 /** 9051 * Schedules an action on a drawable to occur at a specified time. 9052 * 9053 * @param who the recipient of the action 9054 * @param what the action to run on the drawable 9055 * @param when the time at which the action must occur. Uses the 9056 * {@link SystemClock#uptimeMillis} timebase. 9057 */ 9058 public void scheduleDrawable(Drawable who, Runnable what, long when) { 9059 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9060 mAttachInfo.mHandler.postAtTime(what, who, when); 9061 } 9062 } 9063 9064 /** 9065 * Cancels a scheduled action on a drawable. 9066 * 9067 * @param who the recipient of the action 9068 * @param what the action to cancel 9069 */ 9070 public void unscheduleDrawable(Drawable who, Runnable what) { 9071 if (verifyDrawable(who) && what != null && mAttachInfo != null) { 9072 mAttachInfo.mHandler.removeCallbacks(what, who); 9073 } 9074 } 9075 9076 /** 9077 * Unschedule any events associated with the given Drawable. This can be 9078 * used when selecting a new Drawable into a view, so that the previous 9079 * one is completely unscheduled. 9080 * 9081 * @param who The Drawable to unschedule. 9082 * 9083 * @see #drawableStateChanged 9084 */ 9085 public void unscheduleDrawable(Drawable who) { 9086 if (mAttachInfo != null) { 9087 mAttachInfo.mHandler.removeCallbacksAndMessages(who); 9088 } 9089 } 9090 9091 /** 9092 * If your view subclass is displaying its own Drawable objects, it should 9093 * override this function and return true for any Drawable it is 9094 * displaying. This allows animations for those drawables to be 9095 * scheduled. 9096 * 9097 * <p>Be sure to call through to the super class when overriding this 9098 * function. 9099 * 9100 * @param who The Drawable to verify. Return true if it is one you are 9101 * displaying, else return the result of calling through to the 9102 * super class. 9103 * 9104 * @return boolean If true than the Drawable is being displayed in the 9105 * view; else false and it is not allowed to animate. 9106 * 9107 * @see #unscheduleDrawable 9108 * @see #drawableStateChanged 9109 */ 9110 protected boolean verifyDrawable(Drawable who) { 9111 return who == mBGDrawable; 9112 } 9113 9114 /** 9115 * This function is called whenever the state of the view changes in such 9116 * a way that it impacts the state of drawables being shown. 9117 * 9118 * <p>Be sure to call through to the superclass when overriding this 9119 * function. 9120 * 9121 * @see Drawable#setState 9122 */ 9123 protected void drawableStateChanged() { 9124 Drawable d = mBGDrawable; 9125 if (d != null && d.isStateful()) { 9126 d.setState(getDrawableState()); 9127 } 9128 } 9129 9130 /** 9131 * Call this to force a view to update its drawable state. This will cause 9132 * drawableStateChanged to be called on this view. Views that are interested 9133 * in the new state should call getDrawableState. 9134 * 9135 * @see #drawableStateChanged 9136 * @see #getDrawableState 9137 */ 9138 public void refreshDrawableState() { 9139 mPrivateFlags |= DRAWABLE_STATE_DIRTY; 9140 drawableStateChanged(); 9141 9142 ViewParent parent = mParent; 9143 if (parent != null) { 9144 parent.childDrawableStateChanged(this); 9145 } 9146 } 9147 9148 /** 9149 * Return an array of resource IDs of the drawable states representing the 9150 * current state of the view. 9151 * 9152 * @return The current drawable state 9153 * 9154 * @see Drawable#setState 9155 * @see #drawableStateChanged 9156 * @see #onCreateDrawableState 9157 */ 9158 public final int[] getDrawableState() { 9159 if ((mDrawableState != null) && ((mPrivateFlags & DRAWABLE_STATE_DIRTY) == 0)) { 9160 return mDrawableState; 9161 } else { 9162 mDrawableState = onCreateDrawableState(0); 9163 mPrivateFlags &= ~DRAWABLE_STATE_DIRTY; 9164 return mDrawableState; 9165 } 9166 } 9167 9168 /** 9169 * Generate the new {@link android.graphics.drawable.Drawable} state for 9170 * this view. This is called by the view 9171 * system when the cached Drawable state is determined to be invalid. To 9172 * retrieve the current state, you should use {@link #getDrawableState}. 9173 * 9174 * @param extraSpace if non-zero, this is the number of extra entries you 9175 * would like in the returned array in which you can place your own 9176 * states. 9177 * 9178 * @return Returns an array holding the current {@link Drawable} state of 9179 * the view. 9180 * 9181 * @see #mergeDrawableStates 9182 */ 9183 protected int[] onCreateDrawableState(int extraSpace) { 9184 if ((mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE && 9185 mParent instanceof View) { 9186 return ((View) mParent).onCreateDrawableState(extraSpace); 9187 } 9188 9189 int[] drawableState; 9190 9191 int privateFlags = mPrivateFlags; 9192 9193 int viewStateIndex = 0; 9194 if ((privateFlags & PRESSED) != 0) viewStateIndex |= VIEW_STATE_PRESSED; 9195 if ((mViewFlags & ENABLED_MASK) == ENABLED) viewStateIndex |= VIEW_STATE_ENABLED; 9196 if (isFocused()) viewStateIndex |= VIEW_STATE_FOCUSED; 9197 if ((privateFlags & SELECTED) != 0) viewStateIndex |= VIEW_STATE_SELECTED; 9198 if (hasWindowFocus()) viewStateIndex |= VIEW_STATE_WINDOW_FOCUSED; 9199 if ((privateFlags & ACTIVATED) != 0) viewStateIndex |= VIEW_STATE_ACTIVATED; 9200 if (mAttachInfo != null && mAttachInfo.mHardwareAccelerationRequested) { 9201 // This is set if HW acceleration is requested, even if the current 9202 // process doesn't allow it. This is just to allow app preview 9203 // windows to better match their app. 9204 viewStateIndex |= VIEW_STATE_ACCELERATED; 9205 } 9206 9207 drawableState = VIEW_STATE_SETS[viewStateIndex]; 9208 9209 //noinspection ConstantIfStatement 9210 if (false) { 9211 Log.i("View", "drawableStateIndex=" + viewStateIndex); 9212 Log.i("View", toString() 9213 + " pressed=" + ((privateFlags & PRESSED) != 0) 9214 + " en=" + ((mViewFlags & ENABLED_MASK) == ENABLED) 9215 + " fo=" + hasFocus() 9216 + " sl=" + ((privateFlags & SELECTED) != 0) 9217 + " wf=" + hasWindowFocus() 9218 + ": " + Arrays.toString(drawableState)); 9219 } 9220 9221 if (extraSpace == 0) { 9222 return drawableState; 9223 } 9224 9225 final int[] fullState; 9226 if (drawableState != null) { 9227 fullState = new int[drawableState.length + extraSpace]; 9228 System.arraycopy(drawableState, 0, fullState, 0, drawableState.length); 9229 } else { 9230 fullState = new int[extraSpace]; 9231 } 9232 9233 return fullState; 9234 } 9235 9236 /** 9237 * Merge your own state values in <var>additionalState</var> into the base 9238 * state values <var>baseState</var> that were returned by 9239 * {@link #onCreateDrawableState}. 9240 * 9241 * @param baseState The base state values returned by 9242 * {@link #onCreateDrawableState}, which will be modified to also hold your 9243 * own additional state values. 9244 * 9245 * @param additionalState The additional state values you would like 9246 * added to <var>baseState</var>; this array is not modified. 9247 * 9248 * @return As a convenience, the <var>baseState</var> array you originally 9249 * passed into the function is returned. 9250 * 9251 * @see #onCreateDrawableState 9252 */ 9253 protected static int[] mergeDrawableStates(int[] baseState, int[] additionalState) { 9254 final int N = baseState.length; 9255 int i = N - 1; 9256 while (i >= 0 && baseState[i] == 0) { 9257 i--; 9258 } 9259 System.arraycopy(additionalState, 0, baseState, i + 1, additionalState.length); 9260 return baseState; 9261 } 9262 9263 /** 9264 * Call {@link Drawable#jumpToCurrentState() Drawable.jumpToCurrentState()} 9265 * on all Drawable objects associated with this view. 9266 */ 9267 public void jumpDrawablesToCurrentState() { 9268 if (mBGDrawable != null) { 9269 mBGDrawable.jumpToCurrentState(); 9270 } 9271 } 9272 9273 /** 9274 * Sets the background color for this view. 9275 * @param color the color of the background 9276 */ 9277 @RemotableViewMethod 9278 public void setBackgroundColor(int color) { 9279 if (mBGDrawable instanceof ColorDrawable) { 9280 ((ColorDrawable) mBGDrawable).setColor(color); 9281 } else { 9282 setBackgroundDrawable(new ColorDrawable(color)); 9283 } 9284 } 9285 9286 /** 9287 * Set the background to a given resource. The resource should refer to 9288 * a Drawable object or 0 to remove the background. 9289 * @param resid The identifier of the resource. 9290 * @attr ref android.R.styleable#View_background 9291 */ 9292 @RemotableViewMethod 9293 public void setBackgroundResource(int resid) { 9294 if (resid != 0 && resid == mBackgroundResource) { 9295 return; 9296 } 9297 9298 Drawable d= null; 9299 if (resid != 0) { 9300 d = mResources.getDrawable(resid); 9301 } 9302 setBackgroundDrawable(d); 9303 9304 mBackgroundResource = resid; 9305 } 9306 9307 /** 9308 * Set the background to a given Drawable, or remove the background. If the 9309 * background has padding, this View's padding is set to the background's 9310 * padding. However, when a background is removed, this View's padding isn't 9311 * touched. If setting the padding is desired, please use 9312 * {@link #setPadding(int, int, int, int)}. 9313 * 9314 * @param d The Drawable to use as the background, or null to remove the 9315 * background 9316 */ 9317 public void setBackgroundDrawable(Drawable d) { 9318 boolean requestLayout = false; 9319 9320 mBackgroundResource = 0; 9321 9322 /* 9323 * Regardless of whether we're setting a new background or not, we want 9324 * to clear the previous drawable. 9325 */ 9326 if (mBGDrawable != null) { 9327 mBGDrawable.setCallback(null); 9328 unscheduleDrawable(mBGDrawable); 9329 } 9330 9331 if (d != null) { 9332 Rect padding = sThreadLocal.get(); 9333 if (padding == null) { 9334 padding = new Rect(); 9335 sThreadLocal.set(padding); 9336 } 9337 if (d.getPadding(padding)) { 9338 setPadding(padding.left, padding.top, padding.right, padding.bottom); 9339 } 9340 9341 // Compare the minimum sizes of the old Drawable and the new. If there isn't an old or 9342 // if it has a different minimum size, we should layout again 9343 if (mBGDrawable == null || mBGDrawable.getMinimumHeight() != d.getMinimumHeight() || 9344 mBGDrawable.getMinimumWidth() != d.getMinimumWidth()) { 9345 requestLayout = true; 9346 } 9347 9348 d.setCallback(this); 9349 if (d.isStateful()) { 9350 d.setState(getDrawableState()); 9351 } 9352 d.setVisible(getVisibility() == VISIBLE, false); 9353 mBGDrawable = d; 9354 9355 if ((mPrivateFlags & SKIP_DRAW) != 0) { 9356 mPrivateFlags &= ~SKIP_DRAW; 9357 mPrivateFlags |= ONLY_DRAWS_BACKGROUND; 9358 requestLayout = true; 9359 } 9360 } else { 9361 /* Remove the background */ 9362 mBGDrawable = null; 9363 9364 if ((mPrivateFlags & ONLY_DRAWS_BACKGROUND) != 0) { 9365 /* 9366 * This view ONLY drew the background before and we're removing 9367 * the background, so now it won't draw anything 9368 * (hence we SKIP_DRAW) 9369 */ 9370 mPrivateFlags &= ~ONLY_DRAWS_BACKGROUND; 9371 mPrivateFlags |= SKIP_DRAW; 9372 } 9373 9374 /* 9375 * When the background is set, we try to apply its padding to this 9376 * View. When the background is removed, we don't touch this View's 9377 * padding. This is noted in the Javadocs. Hence, we don't need to 9378 * requestLayout(), the invalidate() below is sufficient. 9379 */ 9380 9381 // The old background's minimum size could have affected this 9382 // View's layout, so let's requestLayout 9383 requestLayout = true; 9384 } 9385 9386 computeOpaqueFlags(); 9387 9388 if (requestLayout) { 9389 requestLayout(); 9390 } 9391 9392 mBackgroundSizeChanged = true; 9393 invalidate(); 9394 } 9395 9396 /** 9397 * Gets the background drawable 9398 * @return The drawable used as the background for this view, if any. 9399 */ 9400 public Drawable getBackground() { 9401 return mBGDrawable; 9402 } 9403 9404 /** 9405 * Sets the padding. The view may add on the space required to display 9406 * the scrollbars, depending on the style and visibility of the scrollbars. 9407 * So the values returned from {@link #getPaddingLeft}, {@link #getPaddingTop}, 9408 * {@link #getPaddingRight} and {@link #getPaddingBottom} may be different 9409 * from the values set in this call. 9410 * 9411 * @attr ref android.R.styleable#View_padding 9412 * @attr ref android.R.styleable#View_paddingBottom 9413 * @attr ref android.R.styleable#View_paddingLeft 9414 * @attr ref android.R.styleable#View_paddingRight 9415 * @attr ref android.R.styleable#View_paddingTop 9416 * @param left the left padding in pixels 9417 * @param top the top padding in pixels 9418 * @param right the right padding in pixels 9419 * @param bottom the bottom padding in pixels 9420 */ 9421 public void setPadding(int left, int top, int right, int bottom) { 9422 boolean changed = false; 9423 9424 mUserPaddingLeft = left; 9425 mUserPaddingRight = right; 9426 mUserPaddingBottom = bottom; 9427 9428 final int viewFlags = mViewFlags; 9429 9430 // Common case is there are no scroll bars. 9431 if ((viewFlags & (SCROLLBARS_VERTICAL|SCROLLBARS_HORIZONTAL)) != 0) { 9432 if ((viewFlags & SCROLLBARS_VERTICAL) != 0) { 9433 // TODO Determine what to do with SCROLLBAR_POSITION_DEFAULT based on RTL settings. 9434 final int offset = (viewFlags & SCROLLBARS_INSET_MASK) == 0 9435 ? 0 : getVerticalScrollbarWidth(); 9436 switch (mVerticalScrollbarPosition) { 9437 case SCROLLBAR_POSITION_DEFAULT: 9438 case SCROLLBAR_POSITION_RIGHT: 9439 right += offset; 9440 break; 9441 case SCROLLBAR_POSITION_LEFT: 9442 left += offset; 9443 break; 9444 } 9445 } 9446 if ((viewFlags & SCROLLBARS_HORIZONTAL) != 0) { 9447 bottom += (viewFlags & SCROLLBARS_INSET_MASK) == 0 9448 ? 0 : getHorizontalScrollbarHeight(); 9449 } 9450 } 9451 9452 if (mPaddingLeft != left) { 9453 changed = true; 9454 mPaddingLeft = left; 9455 } 9456 if (mPaddingTop != top) { 9457 changed = true; 9458 mPaddingTop = top; 9459 } 9460 if (mPaddingRight != right) { 9461 changed = true; 9462 mPaddingRight = right; 9463 } 9464 if (mPaddingBottom != bottom) { 9465 changed = true; 9466 mPaddingBottom = bottom; 9467 } 9468 9469 if (changed) { 9470 requestLayout(); 9471 } 9472 } 9473 9474 /** 9475 * Returns the top padding of this view. 9476 * 9477 * @return the top padding in pixels 9478 */ 9479 public int getPaddingTop() { 9480 return mPaddingTop; 9481 } 9482 9483 /** 9484 * Returns the bottom padding of this view. If there are inset and enabled 9485 * scrollbars, this value may include the space required to display the 9486 * scrollbars as well. 9487 * 9488 * @return the bottom padding in pixels 9489 */ 9490 public int getPaddingBottom() { 9491 return mPaddingBottom; 9492 } 9493 9494 /** 9495 * Returns the left padding of this view. If there are inset and enabled 9496 * scrollbars, this value may include the space required to display the 9497 * scrollbars as well. 9498 * 9499 * @return the left padding in pixels 9500 */ 9501 public int getPaddingLeft() { 9502 return mPaddingLeft; 9503 } 9504 9505 /** 9506 * Returns the right padding of this view. If there are inset and enabled 9507 * scrollbars, this value may include the space required to display the 9508 * scrollbars as well. 9509 * 9510 * @return the right padding in pixels 9511 */ 9512 public int getPaddingRight() { 9513 return mPaddingRight; 9514 } 9515 9516 /** 9517 * Changes the selection state of this view. A view can be selected or not. 9518 * Note that selection is not the same as focus. Views are typically 9519 * selected in the context of an AdapterView like ListView or GridView; 9520 * the selected view is the view that is highlighted. 9521 * 9522 * @param selected true if the view must be selected, false otherwise 9523 */ 9524 public void setSelected(boolean selected) { 9525 if (((mPrivateFlags & SELECTED) != 0) != selected) { 9526 mPrivateFlags = (mPrivateFlags & ~SELECTED) | (selected ? SELECTED : 0); 9527 if (!selected) resetPressedState(); 9528 invalidate(); 9529 refreshDrawableState(); 9530 dispatchSetSelected(selected); 9531 } 9532 } 9533 9534 /** 9535 * Dispatch setSelected to all of this View's children. 9536 * 9537 * @see #setSelected(boolean) 9538 * 9539 * @param selected The new selected state 9540 */ 9541 protected void dispatchSetSelected(boolean selected) { 9542 } 9543 9544 /** 9545 * Indicates the selection state of this view. 9546 * 9547 * @return true if the view is selected, false otherwise 9548 */ 9549 @ViewDebug.ExportedProperty 9550 public boolean isSelected() { 9551 return (mPrivateFlags & SELECTED) != 0; 9552 } 9553 9554 /** 9555 * Changes the activated state of this view. A view can be activated or not. 9556 * Note that activation is not the same as selection. Selection is 9557 * a transient property, representing the view (hierarchy) the user is 9558 * currently interacting with. Activation is a longer-term state that the 9559 * user can move views in and out of. For example, in a list view with 9560 * single or multiple selection enabled, the views in the current selection 9561 * set are activated. (Um, yeah, we are deeply sorry about the terminology 9562 * here.) The activated state is propagated down to children of the view it 9563 * is set on. 9564 * 9565 * @param activated true if the view must be activated, false otherwise 9566 */ 9567 public void setActivated(boolean activated) { 9568 if (((mPrivateFlags & ACTIVATED) != 0) != activated) { 9569 mPrivateFlags = (mPrivateFlags & ~ACTIVATED) | (activated ? ACTIVATED : 0); 9570 invalidate(); 9571 refreshDrawableState(); 9572 dispatchSetActivated(activated); 9573 } 9574 } 9575 9576 /** 9577 * Dispatch setActivated to all of this View's children. 9578 * 9579 * @see #setActivated(boolean) 9580 * 9581 * @param activated The new activated state 9582 */ 9583 protected void dispatchSetActivated(boolean activated) { 9584 } 9585 9586 /** 9587 * Indicates the activation state of this view. 9588 * 9589 * @return true if the view is activated, false otherwise 9590 */ 9591 @ViewDebug.ExportedProperty 9592 public boolean isActivated() { 9593 return (mPrivateFlags & ACTIVATED) != 0; 9594 } 9595 9596 /** 9597 * Returns the ViewTreeObserver for this view's hierarchy. The view tree 9598 * observer can be used to get notifications when global events, like 9599 * layout, happen. 9600 * 9601 * The returned ViewTreeObserver observer is not guaranteed to remain 9602 * valid for the lifetime of this View. If the caller of this method keeps 9603 * a long-lived reference to ViewTreeObserver, it should always check for 9604 * the return value of {@link ViewTreeObserver#isAlive()}. 9605 * 9606 * @return The ViewTreeObserver for this view's hierarchy. 9607 */ 9608 public ViewTreeObserver getViewTreeObserver() { 9609 if (mAttachInfo != null) { 9610 return mAttachInfo.mTreeObserver; 9611 } 9612 if (mFloatingTreeObserver == null) { 9613 mFloatingTreeObserver = new ViewTreeObserver(); 9614 } 9615 return mFloatingTreeObserver; 9616 } 9617 9618 /** 9619 * <p>Finds the topmost view in the current view hierarchy.</p> 9620 * 9621 * @return the topmost view containing this view 9622 */ 9623 public View getRootView() { 9624 if (mAttachInfo != null) { 9625 final View v = mAttachInfo.mRootView; 9626 if (v != null) { 9627 return v; 9628 } 9629 } 9630 9631 View parent = this; 9632 9633 while (parent.mParent != null && parent.mParent instanceof View) { 9634 parent = (View) parent.mParent; 9635 } 9636 9637 return parent; 9638 } 9639 9640 /** 9641 * <p>Computes the coordinates of this view on the screen. The argument 9642 * must be an array of two integers. After the method returns, the array 9643 * contains the x and y location in that order.</p> 9644 * 9645 * @param location an array of two integers in which to hold the coordinates 9646 */ 9647 public void getLocationOnScreen(int[] location) { 9648 getLocationInWindow(location); 9649 9650 final AttachInfo info = mAttachInfo; 9651 if (info != null) { 9652 location[0] += info.mWindowLeft; 9653 location[1] += info.mWindowTop; 9654 } 9655 } 9656 9657 /** 9658 * <p>Computes the coordinates of this view in its window. The argument 9659 * must be an array of two integers. After the method returns, the array 9660 * contains the x and y location in that order.</p> 9661 * 9662 * @param location an array of two integers in which to hold the coordinates 9663 */ 9664 public void getLocationInWindow(int[] location) { 9665 if (location == null || location.length < 2) { 9666 throw new IllegalArgumentException("location must be an array of " 9667 + "two integers"); 9668 } 9669 9670 location[0] = mLeft + (int) (mTranslationX + 0.5f); 9671 location[1] = mTop + (int) (mTranslationY + 0.5f); 9672 9673 ViewParent viewParent = mParent; 9674 while (viewParent instanceof View) { 9675 final View view = (View)viewParent; 9676 location[0] += view.mLeft + (int) (view.mTranslationX + 0.5f) - view.mScrollX; 9677 location[1] += view.mTop + (int) (view.mTranslationY + 0.5f) - view.mScrollY; 9678 viewParent = view.mParent; 9679 } 9680 9681 if (viewParent instanceof ViewRoot) { 9682 // *cough* 9683 final ViewRoot vr = (ViewRoot)viewParent; 9684 location[1] -= vr.mCurScrollY; 9685 } 9686 } 9687 9688 /** 9689 * {@hide} 9690 * @param id the id of the view to be found 9691 * @return the view of the specified id, null if cannot be found 9692 */ 9693 protected View findViewTraversal(int id) { 9694 if (id == mID) { 9695 return this; 9696 } 9697 return null; 9698 } 9699 9700 /** 9701 * {@hide} 9702 * @param tag the tag of the view to be found 9703 * @return the view of specified tag, null if cannot be found 9704 */ 9705 protected View findViewWithTagTraversal(Object tag) { 9706 if (tag != null && tag.equals(mTag)) { 9707 return this; 9708 } 9709 return null; 9710 } 9711 9712 /** 9713 * {@hide} 9714 * @param predicate The predicate to evaluate. 9715 * @return The first view that matches the predicate or null. 9716 */ 9717 protected View findViewByPredicateTraversal(Predicate<View> predicate) { 9718 if (predicate.apply(this)) { 9719 return this; 9720 } 9721 return null; 9722 } 9723 9724 /** 9725 * Look for a child view with the given id. If this view has the given 9726 * id, return this view. 9727 * 9728 * @param id The id to search for. 9729 * @return The view that has the given id in the hierarchy or null 9730 */ 9731 public final View findViewById(int id) { 9732 if (id < 0) { 9733 return null; 9734 } 9735 return findViewTraversal(id); 9736 } 9737 9738 /** 9739 * Look for a child view with the given tag. If this view has the given 9740 * tag, return this view. 9741 * 9742 * @param tag The tag to search for, using "tag.equals(getTag())". 9743 * @return The View that has the given tag in the hierarchy or null 9744 */ 9745 public final View findViewWithTag(Object tag) { 9746 if (tag == null) { 9747 return null; 9748 } 9749 return findViewWithTagTraversal(tag); 9750 } 9751 9752 /** 9753 * {@hide} 9754 * Look for a child view that matches the specified predicate. 9755 * If this view matches the predicate, return this view. 9756 * 9757 * @param predicate The predicate to evaluate. 9758 * @return The first view that matches the predicate or null. 9759 */ 9760 public final View findViewByPredicate(Predicate<View> predicate) { 9761 return findViewByPredicateTraversal(predicate); 9762 } 9763 9764 /** 9765 * Sets the identifier for this view. The identifier does not have to be 9766 * unique in this view's hierarchy. The identifier should be a positive 9767 * number. 9768 * 9769 * @see #NO_ID 9770 * @see #getId 9771 * @see #findViewById 9772 * 9773 * @param id a number used to identify the view 9774 * 9775 * @attr ref android.R.styleable#View_id 9776 */ 9777 public void setId(int id) { 9778 mID = id; 9779 } 9780 9781 /** 9782 * {@hide} 9783 * 9784 * @param isRoot true if the view belongs to the root namespace, false 9785 * otherwise 9786 */ 9787 public void setIsRootNamespace(boolean isRoot) { 9788 if (isRoot) { 9789 mPrivateFlags |= IS_ROOT_NAMESPACE; 9790 } else { 9791 mPrivateFlags &= ~IS_ROOT_NAMESPACE; 9792 } 9793 } 9794 9795 /** 9796 * {@hide} 9797 * 9798 * @return true if the view belongs to the root namespace, false otherwise 9799 */ 9800 public boolean isRootNamespace() { 9801 return (mPrivateFlags&IS_ROOT_NAMESPACE) != 0; 9802 } 9803 9804 /** 9805 * Returns this view's identifier. 9806 * 9807 * @return a positive integer used to identify the view or {@link #NO_ID} 9808 * if the view has no ID 9809 * 9810 * @see #setId 9811 * @see #findViewById 9812 * @attr ref android.R.styleable#View_id 9813 */ 9814 @ViewDebug.CapturedViewProperty 9815 public int getId() { 9816 return mID; 9817 } 9818 9819 /** 9820 * Returns this view's tag. 9821 * 9822 * @return the Object stored in this view as a tag 9823 * 9824 * @see #setTag(Object) 9825 * @see #getTag(int) 9826 */ 9827 @ViewDebug.ExportedProperty 9828 public Object getTag() { 9829 return mTag; 9830 } 9831 9832 /** 9833 * Sets the tag associated with this view. A tag can be used to mark 9834 * a view in its hierarchy and does not have to be unique within the 9835 * hierarchy. Tags can also be used to store data within a view without 9836 * resorting to another data structure. 9837 * 9838 * @param tag an Object to tag the view with 9839 * 9840 * @see #getTag() 9841 * @see #setTag(int, Object) 9842 */ 9843 public void setTag(final Object tag) { 9844 mTag = tag; 9845 } 9846 9847 /** 9848 * Returns the tag associated with this view and the specified key. 9849 * 9850 * @param key The key identifying the tag 9851 * 9852 * @return the Object stored in this view as a tag 9853 * 9854 * @see #setTag(int, Object) 9855 * @see #getTag() 9856 */ 9857 public Object getTag(int key) { 9858 SparseArray<Object> tags = null; 9859 synchronized (sTagsLock) { 9860 if (sTags != null) { 9861 tags = sTags.get(this); 9862 } 9863 } 9864 9865 if (tags != null) return tags.get(key); 9866 return null; 9867 } 9868 9869 /** 9870 * Sets a tag associated with this view and a key. A tag can be used 9871 * to mark a view in its hierarchy and does not have to be unique within 9872 * the hierarchy. Tags can also be used to store data within a view 9873 * without resorting to another data structure. 9874 * 9875 * The specified key should be an id declared in the resources of the 9876 * application to ensure it is unique (see the <a 9877 * href={@docRoot}guide/topics/resources/more-resources.html#Id">ID resource type</a>). 9878 * Keys identified as belonging to 9879 * the Android framework or not associated with any package will cause 9880 * an {@link IllegalArgumentException} to be thrown. 9881 * 9882 * @param key The key identifying the tag 9883 * @param tag An Object to tag the view with 9884 * 9885 * @throws IllegalArgumentException If they specified key is not valid 9886 * 9887 * @see #setTag(Object) 9888 * @see #getTag(int) 9889 */ 9890 public void setTag(int key, final Object tag) { 9891 // If the package id is 0x00 or 0x01, it's either an undefined package 9892 // or a framework id 9893 if ((key >>> 24) < 2) { 9894 throw new IllegalArgumentException("The key must be an application-specific " 9895 + "resource id."); 9896 } 9897 9898 setTagInternal(this, key, tag); 9899 } 9900 9901 /** 9902 * Variation of {@link #setTag(int, Object)} that enforces the key to be a 9903 * framework id. 9904 * 9905 * @hide 9906 */ 9907 public void setTagInternal(int key, Object tag) { 9908 if ((key >>> 24) != 0x1) { 9909 throw new IllegalArgumentException("The key must be a framework-specific " 9910 + "resource id."); 9911 } 9912 9913 setTagInternal(this, key, tag); 9914 } 9915 9916 private static void setTagInternal(View view, int key, Object tag) { 9917 SparseArray<Object> tags = null; 9918 synchronized (sTagsLock) { 9919 if (sTags == null) { 9920 sTags = new WeakHashMap<View, SparseArray<Object>>(); 9921 } else { 9922 tags = sTags.get(view); 9923 } 9924 } 9925 9926 if (tags == null) { 9927 tags = new SparseArray<Object>(2); 9928 synchronized (sTagsLock) { 9929 sTags.put(view, tags); 9930 } 9931 } 9932 9933 tags.put(key, tag); 9934 } 9935 9936 /** 9937 * @param consistency The type of consistency. See ViewDebug for more information. 9938 * 9939 * @hide 9940 */ 9941 protected boolean dispatchConsistencyCheck(int consistency) { 9942 return onConsistencyCheck(consistency); 9943 } 9944 9945 /** 9946 * Method that subclasses should implement to check their consistency. The type of 9947 * consistency check is indicated by the bit field passed as a parameter. 9948 * 9949 * @param consistency The type of consistency. See ViewDebug for more information. 9950 * 9951 * @throws IllegalStateException if the view is in an inconsistent state. 9952 * 9953 * @hide 9954 */ 9955 protected boolean onConsistencyCheck(int consistency) { 9956 boolean result = true; 9957 9958 final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; 9959 final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; 9960 9961 if (checkLayout) { 9962 if (getParent() == null) { 9963 result = false; 9964 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 9965 "View " + this + " does not have a parent."); 9966 } 9967 9968 if (mAttachInfo == null) { 9969 result = false; 9970 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 9971 "View " + this + " is not attached to a window."); 9972 } 9973 } 9974 9975 if (checkDrawing) { 9976 // Do not check the DIRTY/DRAWN flags because views can call invalidate() 9977 // from their draw() method 9978 9979 if ((mPrivateFlags & DRAWN) != DRAWN && 9980 (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { 9981 result = false; 9982 android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, 9983 "View " + this + " was invalidated but its drawing cache is valid."); 9984 } 9985 } 9986 9987 return result; 9988 } 9989 9990 /** 9991 * Prints information about this view in the log output, with the tag 9992 * {@link #VIEW_LOG_TAG}. 9993 * 9994 * @hide 9995 */ 9996 public void debug() { 9997 debug(0); 9998 } 9999 10000 /** 10001 * Prints information about this view in the log output, with the tag 10002 * {@link #VIEW_LOG_TAG}. Each line in the output is preceded with an 10003 * indentation defined by the <code>depth</code>. 10004 * 10005 * @param depth the indentation level 10006 * 10007 * @hide 10008 */ 10009 protected void debug(int depth) { 10010 String output = debugIndent(depth - 1); 10011 10012 output += "+ " + this; 10013 int id = getId(); 10014 if (id != -1) { 10015 output += " (id=" + id + ")"; 10016 } 10017 Object tag = getTag(); 10018 if (tag != null) { 10019 output += " (tag=" + tag + ")"; 10020 } 10021 Log.d(VIEW_LOG_TAG, output); 10022 10023 if ((mPrivateFlags & FOCUSED) != 0) { 10024 output = debugIndent(depth) + " FOCUSED"; 10025 Log.d(VIEW_LOG_TAG, output); 10026 } 10027 10028 output = debugIndent(depth); 10029 output += "frame={" + mLeft + ", " + mTop + ", " + mRight 10030 + ", " + mBottom + "} scroll={" + mScrollX + ", " + mScrollY 10031 + "} "; 10032 Log.d(VIEW_LOG_TAG, output); 10033 10034 if (mPaddingLeft != 0 || mPaddingTop != 0 || mPaddingRight != 0 10035 || mPaddingBottom != 0) { 10036 output = debugIndent(depth); 10037 output += "padding={" + mPaddingLeft + ", " + mPaddingTop 10038 + ", " + mPaddingRight + ", " + mPaddingBottom + "}"; 10039 Log.d(VIEW_LOG_TAG, output); 10040 } 10041 10042 output = debugIndent(depth); 10043 output += "mMeasureWidth=" + mMeasuredWidth + 10044 " mMeasureHeight=" + mMeasuredHeight; 10045 Log.d(VIEW_LOG_TAG, output); 10046 10047 output = debugIndent(depth); 10048 if (mLayoutParams == null) { 10049 output += "BAD! no layout params"; 10050 } else { 10051 output = mLayoutParams.debug(output); 10052 } 10053 Log.d(VIEW_LOG_TAG, output); 10054 10055 output = debugIndent(depth); 10056 output += "flags={"; 10057 output += View.printFlags(mViewFlags); 10058 output += "}"; 10059 Log.d(VIEW_LOG_TAG, output); 10060 10061 output = debugIndent(depth); 10062 output += "privateFlags={"; 10063 output += View.printPrivateFlags(mPrivateFlags); 10064 output += "}"; 10065 Log.d(VIEW_LOG_TAG, output); 10066 } 10067 10068 /** 10069 * Creates an string of whitespaces used for indentation. 10070 * 10071 * @param depth the indentation level 10072 * @return a String containing (depth * 2 + 3) * 2 white spaces 10073 * 10074 * @hide 10075 */ 10076 protected static String debugIndent(int depth) { 10077 StringBuilder spaces = new StringBuilder((depth * 2 + 3) * 2); 10078 for (int i = 0; i < (depth * 2) + 3; i++) { 10079 spaces.append(' ').append(' '); 10080 } 10081 return spaces.toString(); 10082 } 10083 10084 /** 10085 * <p>Return the offset of the widget's text baseline from the widget's top 10086 * boundary. If this widget does not support baseline alignment, this 10087 * method returns -1. </p> 10088 * 10089 * @return the offset of the baseline within the widget's bounds or -1 10090 * if baseline alignment is not supported 10091 */ 10092 @ViewDebug.ExportedProperty(category = "layout") 10093 public int getBaseline() { 10094 return -1; 10095 } 10096 10097 /** 10098 * Call this when something has changed which has invalidated the 10099 * layout of this view. This will schedule a layout pass of the view 10100 * tree. 10101 */ 10102 public void requestLayout() { 10103 if (ViewDebug.TRACE_HIERARCHY) { 10104 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.REQUEST_LAYOUT); 10105 } 10106 10107 mPrivateFlags |= FORCE_LAYOUT; 10108 10109 if (mParent != null && !mParent.isLayoutRequested()) { 10110 mParent.requestLayout(); 10111 } 10112 } 10113 10114 /** 10115 * Forces this view to be laid out during the next layout pass. 10116 * This method does not call requestLayout() or forceLayout() 10117 * on the parent. 10118 */ 10119 public void forceLayout() { 10120 mPrivateFlags |= FORCE_LAYOUT; 10121 } 10122 10123 /** 10124 * <p> 10125 * This is called to find out how big a view should be. The parent 10126 * supplies constraint information in the width and height parameters. 10127 * </p> 10128 * 10129 * <p> 10130 * The actual mesurement work of a view is performed in 10131 * {@link #onMeasure(int, int)}, called by this method. Therefore, only 10132 * {@link #onMeasure(int, int)} can and must be overriden by subclasses. 10133 * </p> 10134 * 10135 * 10136 * @param widthMeasureSpec Horizontal space requirements as imposed by the 10137 * parent 10138 * @param heightMeasureSpec Vertical space requirements as imposed by the 10139 * parent 10140 * 10141 * @see #onMeasure(int, int) 10142 */ 10143 public final void measure(int widthMeasureSpec, int heightMeasureSpec) { 10144 if ((mPrivateFlags & FORCE_LAYOUT) == FORCE_LAYOUT || 10145 widthMeasureSpec != mOldWidthMeasureSpec || 10146 heightMeasureSpec != mOldHeightMeasureSpec) { 10147 10148 // first clears the measured dimension flag 10149 mPrivateFlags &= ~MEASURED_DIMENSION_SET; 10150 10151 if (ViewDebug.TRACE_HIERARCHY) { 10152 ViewDebug.trace(this, ViewDebug.HierarchyTraceType.ON_MEASURE); 10153 } 10154 10155 // measure ourselves, this should set the measured dimension flag back 10156 onMeasure(widthMeasureSpec, heightMeasureSpec); 10157 10158 // flag not set, setMeasuredDimension() was not invoked, we raise 10159 // an exception to warn the developer 10160 if ((mPrivateFlags & MEASURED_DIMENSION_SET) != MEASURED_DIMENSION_SET) { 10161 throw new IllegalStateException("onMeasure() did not set the" 10162 + " measured dimension by calling" 10163 + " setMeasuredDimension()"); 10164 } 10165 10166 mPrivateFlags |= LAYOUT_REQUIRED; 10167 } 10168 10169 mOldWidthMeasureSpec = widthMeasureSpec; 10170 mOldHeightMeasureSpec = heightMeasureSpec; 10171 } 10172 10173 /** 10174 * <p> 10175 * Measure the view and its content to determine the measured width and the 10176 * measured height. This method is invoked by {@link #measure(int, int)} and 10177 * should be overriden by subclasses to provide accurate and efficient 10178 * measurement of their contents. 10179 * </p> 10180 * 10181 * <p> 10182 * <strong>CONTRACT:</strong> When overriding this method, you 10183 * <em>must</em> call {@link #setMeasuredDimension(int, int)} to store the 10184 * measured width and height of this view. Failure to do so will trigger an 10185 * <code>IllegalStateException</code>, thrown by 10186 * {@link #measure(int, int)}. Calling the superclass' 10187 * {@link #onMeasure(int, int)} is a valid use. 10188 * </p> 10189 * 10190 * <p> 10191 * The base class implementation of measure defaults to the background size, 10192 * unless a larger size is allowed by the MeasureSpec. Subclasses should 10193 * override {@link #onMeasure(int, int)} to provide better measurements of 10194 * their content. 10195 * </p> 10196 * 10197 * <p> 10198 * If this method is overridden, it is the subclass's responsibility to make 10199 * sure the measured height and width are at least the view's minimum height 10200 * and width ({@link #getSuggestedMinimumHeight()} and 10201 * {@link #getSuggestedMinimumWidth()}). 10202 * </p> 10203 * 10204 * @param widthMeasureSpec horizontal space requirements as imposed by the parent. 10205 * The requirements are encoded with 10206 * {@link android.view.View.MeasureSpec}. 10207 * @param heightMeasureSpec vertical space requirements as imposed by the parent. 10208 * The requirements are encoded with 10209 * {@link android.view.View.MeasureSpec}. 10210 * 10211 * @see #getMeasuredWidth() 10212 * @see #getMeasuredHeight() 10213 * @see #setMeasuredDimension(int, int) 10214 * @see #getSuggestedMinimumHeight() 10215 * @see #getSuggestedMinimumWidth() 10216 * @see android.view.View.MeasureSpec#getMode(int) 10217 * @see android.view.View.MeasureSpec#getSize(int) 10218 */ 10219 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 10220 setMeasuredDimension(getDefaultSize(getSuggestedMinimumWidth(), widthMeasureSpec), 10221 getDefaultSize(getSuggestedMinimumHeight(), heightMeasureSpec)); 10222 } 10223 10224 /** 10225 * <p>This mehod must be called by {@link #onMeasure(int, int)} to store the 10226 * measured width and measured height. Failing to do so will trigger an 10227 * exception at measurement time.</p> 10228 * 10229 * @param measuredWidth The measured width of this view. May be a complex 10230 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10231 * {@link #MEASURED_STATE_TOO_SMALL}. 10232 * @param measuredHeight The measured height of this view. May be a complex 10233 * bit mask as defined by {@link #MEASURED_SIZE_MASK} and 10234 * {@link #MEASURED_STATE_TOO_SMALL}. 10235 */ 10236 protected final void setMeasuredDimension(int measuredWidth, int measuredHeight) { 10237 mMeasuredWidth = measuredWidth; 10238 mMeasuredHeight = measuredHeight; 10239 10240 mPrivateFlags |= MEASURED_DIMENSION_SET; 10241 } 10242 10243 /** 10244 * Merge two states as returned by {@link #getMeasuredState()}. 10245 * @param curState The current state as returned from a view or the result 10246 * of combining multiple views. 10247 * @param newState The new view state to combine. 10248 * @return Returns a new integer reflecting the combination of the two 10249 * states. 10250 */ 10251 public static int combineMeasuredStates(int curState, int newState) { 10252 return curState | newState; 10253 } 10254 10255 /** 10256 * Version of {@link #resolveSizeAndState(int, int, int)} 10257 * returning only the {@link #MEASURED_SIZE_MASK} bits of the result. 10258 */ 10259 public static int resolveSize(int size, int measureSpec) { 10260 return resolveSizeAndState(size, measureSpec, 0) & MEASURED_SIZE_MASK; 10261 } 10262 10263 /** 10264 * Utility to reconcile a desired size and state, with constraints imposed 10265 * by a MeasureSpec. Will take the desired size, unless a different size 10266 * is imposed by the constraints. The returned value is a compound integer, 10267 * with the resolved size in the {@link #MEASURED_SIZE_MASK} bits and 10268 * optionally the bit {@link #MEASURED_STATE_TOO_SMALL} set if the resulting 10269 * size is smaller than the size the view wants to be. 10270 * 10271 * @param size How big the view wants to be 10272 * @param measureSpec Constraints imposed by the parent 10273 * @return Size information bit mask as defined by 10274 * {@link #MEASURED_SIZE_MASK} and {@link #MEASURED_STATE_TOO_SMALL}. 10275 */ 10276 public static int resolveSizeAndState(int size, int measureSpec, int childMeasuredState) { 10277 int result = size; 10278 int specMode = MeasureSpec.getMode(measureSpec); 10279 int specSize = MeasureSpec.getSize(measureSpec); 10280 switch (specMode) { 10281 case MeasureSpec.UNSPECIFIED: 10282 result = size; 10283 break; 10284 case MeasureSpec.AT_MOST: 10285 if (specSize < size) { 10286 result = specSize | MEASURED_STATE_TOO_SMALL; 10287 } else { 10288 result = size; 10289 } 10290 break; 10291 case MeasureSpec.EXACTLY: 10292 result = specSize; 10293 break; 10294 } 10295 return result | (childMeasuredState&MEASURED_STATE_MASK); 10296 } 10297 10298 /** 10299 * Utility to return a default size. Uses the supplied size if the 10300 * MeasureSpec imposed no contraints. Will get larger if allowed 10301 * by the MeasureSpec. 10302 * 10303 * @param size Default size for this view 10304 * @param measureSpec Constraints imposed by the parent 10305 * @return The size this view should be. 10306 */ 10307 public static int getDefaultSize(int size, int measureSpec) { 10308 int result = size; 10309 int specMode = MeasureSpec.getMode(measureSpec); 10310 int specSize = MeasureSpec.getSize(measureSpec); 10311 10312 switch (specMode) { 10313 case MeasureSpec.UNSPECIFIED: 10314 result = size; 10315 break; 10316 case MeasureSpec.AT_MOST: 10317 case MeasureSpec.EXACTLY: 10318 result = specSize; 10319 break; 10320 } 10321 return result; 10322 } 10323 10324 /** 10325 * Returns the suggested minimum height that the view should use. This 10326 * returns the maximum of the view's minimum height 10327 * and the background's minimum height 10328 * ({@link android.graphics.drawable.Drawable#getMinimumHeight()}). 10329 * <p> 10330 * When being used in {@link #onMeasure(int, int)}, the caller should still 10331 * ensure the returned height is within the requirements of the parent. 10332 * 10333 * @return The suggested minimum height of the view. 10334 */ 10335 protected int getSuggestedMinimumHeight() { 10336 int suggestedMinHeight = mMinHeight; 10337 10338 if (mBGDrawable != null) { 10339 final int bgMinHeight = mBGDrawable.getMinimumHeight(); 10340 if (suggestedMinHeight < bgMinHeight) { 10341 suggestedMinHeight = bgMinHeight; 10342 } 10343 } 10344 10345 return suggestedMinHeight; 10346 } 10347 10348 /** 10349 * Returns the suggested minimum width that the view should use. This 10350 * returns the maximum of the view's minimum width) 10351 * and the background's minimum width 10352 * ({@link android.graphics.drawable.Drawable#getMinimumWidth()}). 10353 * <p> 10354 * When being used in {@link #onMeasure(int, int)}, the caller should still 10355 * ensure the returned width is within the requirements of the parent. 10356 * 10357 * @return The suggested minimum width of the view. 10358 */ 10359 protected int getSuggestedMinimumWidth() { 10360 int suggestedMinWidth = mMinWidth; 10361 10362 if (mBGDrawable != null) { 10363 final int bgMinWidth = mBGDrawable.getMinimumWidth(); 10364 if (suggestedMinWidth < bgMinWidth) { 10365 suggestedMinWidth = bgMinWidth; 10366 } 10367 } 10368 10369 return suggestedMinWidth; 10370 } 10371 10372 /** 10373 * Sets the minimum height of the view. It is not guaranteed the view will 10374 * be able to achieve this minimum height (for example, if its parent layout 10375 * constrains it with less available height). 10376 * 10377 * @param minHeight The minimum height the view will try to be. 10378 */ 10379 public void setMinimumHeight(int minHeight) { 10380 mMinHeight = minHeight; 10381 } 10382 10383 /** 10384 * Sets the minimum width of the view. It is not guaranteed the view will 10385 * be able to achieve this minimum width (for example, if its parent layout 10386 * constrains it with less available width). 10387 * 10388 * @param minWidth The minimum width the view will try to be. 10389 */ 10390 public void setMinimumWidth(int minWidth) { 10391 mMinWidth = minWidth; 10392 } 10393 10394 /** 10395 * Get the animation currently associated with this view. 10396 * 10397 * @return The animation that is currently playing or 10398 * scheduled to play for this view. 10399 */ 10400 public Animation getAnimation() { 10401 return mCurrentAnimation; 10402 } 10403 10404 /** 10405 * Start the specified animation now. 10406 * 10407 * @param animation the animation to start now 10408 */ 10409 public void startAnimation(Animation animation) { 10410 animation.setStartTime(Animation.START_ON_FIRST_FRAME); 10411 setAnimation(animation); 10412 invalidate(); 10413 } 10414 10415 /** 10416 * Cancels any animations for this view. 10417 */ 10418 public void clearAnimation() { 10419 if (mCurrentAnimation != null) { 10420 mCurrentAnimation.detach(); 10421 } 10422 mCurrentAnimation = null; 10423 } 10424 10425 /** 10426 * Sets the next animation to play for this view. 10427 * If you want the animation to play immediately, use 10428 * startAnimation. This method provides allows fine-grained 10429 * control over the start time and invalidation, but you 10430 * must make sure that 1) the animation has a start time set, and 10431 * 2) the view will be invalidated when the animation is supposed to 10432 * start. 10433 * 10434 * @param animation The next animation, or null. 10435 */ 10436 public void setAnimation(Animation animation) { 10437 mCurrentAnimation = animation; 10438 if (animation != null) { 10439 animation.reset(); 10440 } 10441 } 10442 10443 /** 10444 * Invoked by a parent ViewGroup to notify the start of the animation 10445 * currently associated with this view. If you override this method, 10446 * always call super.onAnimationStart(); 10447 * 10448 * @see #setAnimation(android.view.animation.Animation) 10449 * @see #getAnimation() 10450 */ 10451 protected void onAnimationStart() { 10452 mPrivateFlags |= ANIMATION_STARTED; 10453 } 10454 10455 /** 10456 * Invoked by a parent ViewGroup to notify the end of the animation 10457 * currently associated with this view. If you override this method, 10458 * always call super.onAnimationEnd(); 10459 * 10460 * @see #setAnimation(android.view.animation.Animation) 10461 * @see #getAnimation() 10462 */ 10463 protected void onAnimationEnd() { 10464 mPrivateFlags &= ~ANIMATION_STARTED; 10465 } 10466 10467 /** 10468 * Invoked if there is a Transform that involves alpha. Subclass that can 10469 * draw themselves with the specified alpha should return true, and then 10470 * respect that alpha when their onDraw() is called. If this returns false 10471 * then the view may be redirected to draw into an offscreen buffer to 10472 * fulfill the request, which will look fine, but may be slower than if the 10473 * subclass handles it internally. The default implementation returns false. 10474 * 10475 * @param alpha The alpha (0..255) to apply to the view's drawing 10476 * @return true if the view can draw with the specified alpha. 10477 */ 10478 protected boolean onSetAlpha(int alpha) { 10479 return false; 10480 } 10481 10482 /** 10483 * This is used by the RootView to perform an optimization when 10484 * the view hierarchy contains one or several SurfaceView. 10485 * SurfaceView is always considered transparent, but its children are not, 10486 * therefore all View objects remove themselves from the global transparent 10487 * region (passed as a parameter to this function). 10488 * 10489 * @param region The transparent region for this ViewRoot (window). 10490 * 10491 * @return Returns true if the effective visibility of the view at this 10492 * point is opaque, regardless of the transparent region; returns false 10493 * if it is possible for underlying windows to be seen behind the view. 10494 * 10495 * {@hide} 10496 */ 10497 public boolean gatherTransparentRegion(Region region) { 10498 final AttachInfo attachInfo = mAttachInfo; 10499 if (region != null && attachInfo != null) { 10500 final int pflags = mPrivateFlags; 10501 if ((pflags & SKIP_DRAW) == 0) { 10502 // The SKIP_DRAW flag IS NOT set, so this view draws. We need to 10503 // remove it from the transparent region. 10504 final int[] location = attachInfo.mTransparentLocation; 10505 getLocationInWindow(location); 10506 region.op(location[0], location[1], location[0] + mRight - mLeft, 10507 location[1] + mBottom - mTop, Region.Op.DIFFERENCE); 10508 } else if ((pflags & ONLY_DRAWS_BACKGROUND) != 0 && mBGDrawable != null) { 10509 // The ONLY_DRAWS_BACKGROUND flag IS set and the background drawable 10510 // exists, so we remove the background drawable's non-transparent 10511 // parts from this transparent region. 10512 applyDrawableToTransparentRegion(mBGDrawable, region); 10513 } 10514 } 10515 return true; 10516 } 10517 10518 /** 10519 * Play a sound effect for this view. 10520 * 10521 * <p>The framework will play sound effects for some built in actions, such as 10522 * clicking, but you may wish to play these effects in your widget, 10523 * for instance, for internal navigation. 10524 * 10525 * <p>The sound effect will only be played if sound effects are enabled by the user, and 10526 * {@link #isSoundEffectsEnabled()} is true. 10527 * 10528 * @param soundConstant One of the constants defined in {@link SoundEffectConstants} 10529 */ 10530 public void playSoundEffect(int soundConstant) { 10531 if (mAttachInfo == null || mAttachInfo.mRootCallbacks == null || !isSoundEffectsEnabled()) { 10532 return; 10533 } 10534 mAttachInfo.mRootCallbacks.playSoundEffect(soundConstant); 10535 } 10536 10537 /** 10538 * BZZZTT!!1! 10539 * 10540 * <p>Provide haptic feedback to the user for this view. 10541 * 10542 * <p>The framework will provide haptic feedback for some built in actions, 10543 * such as long presses, but you may wish to provide feedback for your 10544 * own widget. 10545 * 10546 * <p>The feedback will only be performed if 10547 * {@link #isHapticFeedbackEnabled()} is true. 10548 * 10549 * @param feedbackConstant One of the constants defined in 10550 * {@link HapticFeedbackConstants} 10551 */ 10552 public boolean performHapticFeedback(int feedbackConstant) { 10553 return performHapticFeedback(feedbackConstant, 0); 10554 } 10555 10556 /** 10557 * BZZZTT!!1! 10558 * 10559 * <p>Like {@link #performHapticFeedback(int)}, with additional options. 10560 * 10561 * @param feedbackConstant One of the constants defined in 10562 * {@link HapticFeedbackConstants} 10563 * @param flags Additional flags as per {@link HapticFeedbackConstants}. 10564 */ 10565 public boolean performHapticFeedback(int feedbackConstant, int flags) { 10566 if (mAttachInfo == null) { 10567 return false; 10568 } 10569 //noinspection SimplifiableIfStatement 10570 if ((flags & HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING) == 0 10571 && !isHapticFeedbackEnabled()) { 10572 return false; 10573 } 10574 return mAttachInfo.mRootCallbacks.performHapticFeedback(feedbackConstant, 10575 (flags & HapticFeedbackConstants.FLAG_IGNORE_GLOBAL_SETTING) != 0); 10576 } 10577 10578 /** 10579 * !!! TODO: real docs 10580 * 10581 * The base class implementation makes the shadow the same size and appearance 10582 * as the view itself, and positions it with its center at the touch point. 10583 */ 10584 public static class DragShadowBuilder { 10585 private final WeakReference<View> mView; 10586 10587 /** 10588 * Construct a shadow builder object for use with the given view. 10589 * @param view 10590 */ 10591 public DragShadowBuilder(View view) { 10592 mView = new WeakReference<View>(view); 10593 } 10594 10595 final public View getView() { 10596 return mView.get(); 10597 } 10598 10599 /** 10600 * Provide the draggable-shadow metrics for the operation: the dimensions of 10601 * the shadow image itself, and the point within that shadow that should 10602 * be centered under the touch location while dragging. 10603 * <p> 10604 * The default implementation sets the dimensions of the shadow to be the 10605 * same as the dimensions of the View itself and centers the shadow under 10606 * the touch point. 10607 * 10608 * @param shadowSize The application should set the {@code x} member of this 10609 * parameter to the desired shadow width, and the {@code y} member to 10610 * the desired height. 10611 * @param shadowTouchPoint The application should set this point to be the 10612 * location within the shadow that should track directly underneath 10613 * the touch point on the screen during a drag. 10614 */ 10615 public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) { 10616 final View view = mView.get(); 10617 if (view != null) { 10618 shadowSize.set(view.getWidth(), view.getHeight()); 10619 shadowTouchPoint.set(shadowSize.x / 2, shadowSize.y / 2); 10620 } else { 10621 Log.e(View.VIEW_LOG_TAG, "Asked for drag thumb metrics but no view"); 10622 } 10623 } 10624 10625 /** 10626 * Draw the shadow image for the upcoming drag. The shadow canvas was 10627 * created with the dimensions supplied by the 10628 * {@link #onProvideShadowMetrics(Point, Point)} callback. 10629 * 10630 * @param canvas 10631 */ 10632 public void onDrawShadow(Canvas canvas) { 10633 final View view = mView.get(); 10634 if (view != null) { 10635 view.draw(canvas); 10636 } else { 10637 Log.e(View.VIEW_LOG_TAG, "Asked to draw drag shadow but no view"); 10638 } 10639 } 10640 } 10641 10642 /** 10643 * Drag and drop. App calls startDrag(), then callbacks to the shadow builder's 10644 * {@link DragShadowBuilder#onProvideShadowMetrics(Point, Point)} and 10645 * {@link DragShadowBuilder#onDrawShadow(Canvas)} methods happen, then the drag 10646 * operation is handed over to the OS. 10647 * !!! TODO: real docs 10648 * 10649 * @param data !!! TODO 10650 * @param shadowBuilder !!! TODO 10651 * @param myLocalState An arbitrary object that will be passed as part of every DragEvent 10652 * delivered to the calling application during the course of the current drag operation. 10653 * This object is private to the application that called startDrag(), and is not 10654 * visible to other applications. It provides a lightweight way for the application to 10655 * propagate information from the initiator to the recipient of a drag within its own 10656 * application; for example, to help disambiguate between 'copy' and 'move' semantics. 10657 * @param flags Flags affecting the drag operation. At present no flags are defined; 10658 * pass 0 for this parameter. 10659 * @return {@code true} if the drag operation was initiated successfully; {@code false} if 10660 * an error prevented the drag from taking place. 10661 */ 10662 public final boolean startDrag(ClipData data, DragShadowBuilder shadowBuilder, 10663 Object myLocalState, int flags) { 10664 if (ViewDebug.DEBUG_DRAG) { 10665 Log.d(VIEW_LOG_TAG, "startDrag: data=" + data + " flags=" + flags); 10666 } 10667 boolean okay = false; 10668 10669 Point shadowSize = new Point(); 10670 Point shadowTouchPoint = new Point(); 10671 shadowBuilder.onProvideShadowMetrics(shadowSize, shadowTouchPoint); 10672 10673 if ((shadowSize.x < 0) || (shadowSize.y < 0) || 10674 (shadowTouchPoint.x < 0) || (shadowTouchPoint.y < 0)) { 10675 throw new IllegalStateException("Drag shadow dimensions must not be negative"); 10676 } 10677 10678 if (ViewDebug.DEBUG_DRAG) { 10679 Log.d(VIEW_LOG_TAG, "drag shadow: width=" + shadowSize.x + " height=" + shadowSize.y 10680 + " shadowX=" + shadowTouchPoint.x + " shadowY=" + shadowTouchPoint.y); 10681 } 10682 Surface surface = new Surface(); 10683 try { 10684 IBinder token = mAttachInfo.mSession.prepareDrag(mAttachInfo.mWindow, 10685 flags, shadowSize.x, shadowSize.y, surface); 10686 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "prepareDrag returned token=" + token 10687 + " surface=" + surface); 10688 if (token != null) { 10689 Canvas canvas = surface.lockCanvas(null); 10690 try { 10691 canvas.drawColor(0, PorterDuff.Mode.CLEAR); 10692 shadowBuilder.onDrawShadow(canvas); 10693 } finally { 10694 surface.unlockCanvasAndPost(canvas); 10695 } 10696 10697 final ViewRoot root = getViewRoot(); 10698 10699 // Cache the local state object for delivery with DragEvents 10700 root.setLocalDragState(myLocalState); 10701 10702 // repurpose 'shadowSize' for the last touch point 10703 root.getLastTouchPoint(shadowSize); 10704 10705 okay = mAttachInfo.mSession.performDrag(mAttachInfo.mWindow, token, 10706 shadowSize.x, shadowSize.y, 10707 shadowTouchPoint.x, shadowTouchPoint.y, data); 10708 if (ViewDebug.DEBUG_DRAG) Log.d(VIEW_LOG_TAG, "performDrag returned " + okay); 10709 } 10710 } catch (Exception e) { 10711 Log.e(VIEW_LOG_TAG, "Unable to initiate drag", e); 10712 surface.destroy(); 10713 } 10714 10715 return okay; 10716 } 10717 10718 /** 10719 * Drag-and-drop event dispatch. The event.getAction() verb is one of the DragEvent 10720 * constants DRAG_STARTED_EVENT, DRAG_EVENT, DROP_EVENT, and DRAG_ENDED_EVENT. 10721 * 10722 * For DRAG_STARTED_EVENT, event.getClipDescription() describes the content 10723 * being dragged. onDragEvent() should return 'true' if the view can handle 10724 * a drop of that content. A view that returns 'false' here will receive no 10725 * further calls to onDragEvent() about the drag/drop operation. 10726 * 10727 * For DRAG_ENTERED, event.getClipDescription() describes the content being 10728 * dragged. This will be the same content description passed in the 10729 * DRAG_STARTED_EVENT invocation. 10730 * 10731 * For DRAG_EXITED, event.getClipDescription() describes the content being 10732 * dragged. This will be the same content description passed in the 10733 * DRAG_STARTED_EVENT invocation. The view should return to its approriate 10734 * drag-acceptance visual state. 10735 * 10736 * For DRAG_LOCATION_EVENT, event.getX() and event.getY() give the location in View 10737 * coordinates of the current drag point. The view must return 'true' if it 10738 * can accept a drop of the current drag content, false otherwise. 10739 * 10740 * For DROP_EVENT, event.getX() and event.getY() give the location of the drop 10741 * within the view; also, event.getClipData() returns the full data payload 10742 * being dropped. The view should return 'true' if it consumed the dropped 10743 * content, 'false' if it did not. 10744 * 10745 * For DRAG_ENDED_EVENT, the 'event' argument may be null. The view should return 10746 * to its normal visual state. 10747 */ 10748 public boolean onDragEvent(DragEvent event) { 10749 return false; 10750 } 10751 10752 /** 10753 * Views typically don't need to override dispatchDragEvent(); it just calls 10754 * onDragEvent(event) and passes the result up appropriately. 10755 */ 10756 public boolean dispatchDragEvent(DragEvent event) { 10757 if (mOnDragListener != null && (mViewFlags & ENABLED_MASK) == ENABLED 10758 && mOnDragListener.onDrag(this, event)) { 10759 return true; 10760 } 10761 return onDragEvent(event); 10762 } 10763 10764 /** 10765 * This needs to be a better API (NOT ON VIEW) before it is exposed. If 10766 * it is ever exposed at all. 10767 * @hide 10768 */ 10769 public void onCloseSystemDialogs(String reason) { 10770 } 10771 10772 /** 10773 * Given a Drawable whose bounds have been set to draw into this view, 10774 * update a Region being computed for {@link #gatherTransparentRegion} so 10775 * that any non-transparent parts of the Drawable are removed from the 10776 * given transparent region. 10777 * 10778 * @param dr The Drawable whose transparency is to be applied to the region. 10779 * @param region A Region holding the current transparency information, 10780 * where any parts of the region that are set are considered to be 10781 * transparent. On return, this region will be modified to have the 10782 * transparency information reduced by the corresponding parts of the 10783 * Drawable that are not transparent. 10784 * {@hide} 10785 */ 10786 public void applyDrawableToTransparentRegion(Drawable dr, Region region) { 10787 if (DBG) { 10788 Log.i("View", "Getting transparent region for: " + this); 10789 } 10790 final Region r = dr.getTransparentRegion(); 10791 final Rect db = dr.getBounds(); 10792 final AttachInfo attachInfo = mAttachInfo; 10793 if (r != null && attachInfo != null) { 10794 final int w = getRight()-getLeft(); 10795 final int h = getBottom()-getTop(); 10796 if (db.left > 0) { 10797 //Log.i("VIEW", "Drawable left " + db.left + " > view 0"); 10798 r.op(0, 0, db.left, h, Region.Op.UNION); 10799 } 10800 if (db.right < w) { 10801 //Log.i("VIEW", "Drawable right " + db.right + " < view " + w); 10802 r.op(db.right, 0, w, h, Region.Op.UNION); 10803 } 10804 if (db.top > 0) { 10805 //Log.i("VIEW", "Drawable top " + db.top + " > view 0"); 10806 r.op(0, 0, w, db.top, Region.Op.UNION); 10807 } 10808 if (db.bottom < h) { 10809 //Log.i("VIEW", "Drawable bottom " + db.bottom + " < view " + h); 10810 r.op(0, db.bottom, w, h, Region.Op.UNION); 10811 } 10812 final int[] location = attachInfo.mTransparentLocation; 10813 getLocationInWindow(location); 10814 r.translate(location[0], location[1]); 10815 region.op(r, Region.Op.INTERSECT); 10816 } else { 10817 region.op(db, Region.Op.DIFFERENCE); 10818 } 10819 } 10820 10821 private void postCheckForLongClick(int delayOffset) { 10822 mHasPerformedLongPress = false; 10823 10824 if (mPendingCheckForLongPress == null) { 10825 mPendingCheckForLongPress = new CheckForLongPress(); 10826 } 10827 mPendingCheckForLongPress.rememberWindowAttachCount(); 10828 postDelayed(mPendingCheckForLongPress, 10829 ViewConfiguration.getLongPressTimeout() - delayOffset); 10830 } 10831 10832 /** 10833 * Inflate a view from an XML resource. This convenience method wraps the {@link 10834 * LayoutInflater} class, which provides a full range of options for view inflation. 10835 * 10836 * @param context The Context object for your activity or application. 10837 * @param resource The resource ID to inflate 10838 * @param root A view group that will be the parent. Used to properly inflate the 10839 * layout_* parameters. 10840 * @see LayoutInflater 10841 */ 10842 public static View inflate(Context context, int resource, ViewGroup root) { 10843 LayoutInflater factory = LayoutInflater.from(context); 10844 return factory.inflate(resource, root); 10845 } 10846 10847 /** 10848 * Scroll the view with standard behavior for scrolling beyond the normal 10849 * content boundaries. Views that call this method should override 10850 * {@link #onOverScrolled(int, int, boolean, boolean)} to respond to the 10851 * results of an over-scroll operation. 10852 * 10853 * Views can use this method to handle any touch or fling-based scrolling. 10854 * 10855 * @param deltaX Change in X in pixels 10856 * @param deltaY Change in Y in pixels 10857 * @param scrollX Current X scroll value in pixels before applying deltaX 10858 * @param scrollY Current Y scroll value in pixels before applying deltaY 10859 * @param scrollRangeX Maximum content scroll range along the X axis 10860 * @param scrollRangeY Maximum content scroll range along the Y axis 10861 * @param maxOverScrollX Number of pixels to overscroll by in either direction 10862 * along the X axis. 10863 * @param maxOverScrollY Number of pixels to overscroll by in either direction 10864 * along the Y axis. 10865 * @param isTouchEvent true if this scroll operation is the result of a touch event. 10866 * @return true if scrolling was clamped to an over-scroll boundary along either 10867 * axis, false otherwise. 10868 */ 10869 protected boolean overScrollBy(int deltaX, int deltaY, 10870 int scrollX, int scrollY, 10871 int scrollRangeX, int scrollRangeY, 10872 int maxOverScrollX, int maxOverScrollY, 10873 boolean isTouchEvent) { 10874 final int overScrollMode = mOverScrollMode; 10875 final boolean canScrollHorizontal = 10876 computeHorizontalScrollRange() > computeHorizontalScrollExtent(); 10877 final boolean canScrollVertical = 10878 computeVerticalScrollRange() > computeVerticalScrollExtent(); 10879 final boolean overScrollHorizontal = overScrollMode == OVER_SCROLL_ALWAYS || 10880 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollHorizontal); 10881 final boolean overScrollVertical = overScrollMode == OVER_SCROLL_ALWAYS || 10882 (overScrollMode == OVER_SCROLL_IF_CONTENT_SCROLLS && canScrollVertical); 10883 10884 int newScrollX = scrollX + deltaX; 10885 if (!overScrollHorizontal) { 10886 maxOverScrollX = 0; 10887 } 10888 10889 int newScrollY = scrollY + deltaY; 10890 if (!overScrollVertical) { 10891 maxOverScrollY = 0; 10892 } 10893 10894 // Clamp values if at the limits and record 10895 final int left = -maxOverScrollX; 10896 final int right = maxOverScrollX + scrollRangeX; 10897 final int top = -maxOverScrollY; 10898 final int bottom = maxOverScrollY + scrollRangeY; 10899 10900 boolean clampedX = false; 10901 if (newScrollX > right) { 10902 newScrollX = right; 10903 clampedX = true; 10904 } else if (newScrollX < left) { 10905 newScrollX = left; 10906 clampedX = true; 10907 } 10908 10909 boolean clampedY = false; 10910 if (newScrollY > bottom) { 10911 newScrollY = bottom; 10912 clampedY = true; 10913 } else if (newScrollY < top) { 10914 newScrollY = top; 10915 clampedY = true; 10916 } 10917 10918 onOverScrolled(newScrollX, newScrollY, clampedX, clampedY); 10919 10920 return clampedX || clampedY; 10921 } 10922 10923 /** 10924 * Called by {@link #overScrollBy(int, int, int, int, int, int, int, int, boolean)} to 10925 * respond to the results of an over-scroll operation. 10926 * 10927 * @param scrollX New X scroll value in pixels 10928 * @param scrollY New Y scroll value in pixels 10929 * @param clampedX True if scrollX was clamped to an over-scroll boundary 10930 * @param clampedY True if scrollY was clamped to an over-scroll boundary 10931 */ 10932 protected void onOverScrolled(int scrollX, int scrollY, 10933 boolean clampedX, boolean clampedY) { 10934 // Intentionally empty. 10935 } 10936 10937 /** 10938 * Returns the over-scroll mode for this view. The result will be 10939 * one of {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 10940 * (allow over-scrolling only if the view content is larger than the container), 10941 * or {@link #OVER_SCROLL_NEVER}. 10942 * 10943 * @return This view's over-scroll mode. 10944 */ 10945 public int getOverScrollMode() { 10946 return mOverScrollMode; 10947 } 10948 10949 /** 10950 * Set the over-scroll mode for this view. Valid over-scroll modes are 10951 * {@link #OVER_SCROLL_ALWAYS} (default), {@link #OVER_SCROLL_IF_CONTENT_SCROLLS} 10952 * (allow over-scrolling only if the view content is larger than the container), 10953 * or {@link #OVER_SCROLL_NEVER}. 10954 * 10955 * Setting the over-scroll mode of a view will have an effect only if the 10956 * view is capable of scrolling. 10957 * 10958 * @param overScrollMode The new over-scroll mode for this view. 10959 */ 10960 public void setOverScrollMode(int overScrollMode) { 10961 if (overScrollMode != OVER_SCROLL_ALWAYS && 10962 overScrollMode != OVER_SCROLL_IF_CONTENT_SCROLLS && 10963 overScrollMode != OVER_SCROLL_NEVER) { 10964 throw new IllegalArgumentException("Invalid overscroll mode " + overScrollMode); 10965 } 10966 mOverScrollMode = overScrollMode; 10967 } 10968 10969 /** 10970 * A MeasureSpec encapsulates the layout requirements passed from parent to child. 10971 * Each MeasureSpec represents a requirement for either the width or the height. 10972 * A MeasureSpec is comprised of a size and a mode. There are three possible 10973 * modes: 10974 * <dl> 10975 * <dt>UNSPECIFIED</dt> 10976 * <dd> 10977 * The parent has not imposed any constraint on the child. It can be whatever size 10978 * it wants. 10979 * </dd> 10980 * 10981 * <dt>EXACTLY</dt> 10982 * <dd> 10983 * The parent has determined an exact size for the child. The child is going to be 10984 * given those bounds regardless of how big it wants to be. 10985 * </dd> 10986 * 10987 * <dt>AT_MOST</dt> 10988 * <dd> 10989 * The child can be as large as it wants up to the specified size. 10990 * </dd> 10991 * </dl> 10992 * 10993 * MeasureSpecs are implemented as ints to reduce object allocation. This class 10994 * is provided to pack and unpack the <size, mode> tuple into the int. 10995 */ 10996 public static class MeasureSpec { 10997 private static final int MODE_SHIFT = 30; 10998 private static final int MODE_MASK = 0x3 << MODE_SHIFT; 10999 11000 /** 11001 * Measure specification mode: The parent has not imposed any constraint 11002 * on the child. It can be whatever size it wants. 11003 */ 11004 public static final int UNSPECIFIED = 0 << MODE_SHIFT; 11005 11006 /** 11007 * Measure specification mode: The parent has determined an exact size 11008 * for the child. The child is going to be given those bounds regardless 11009 * of how big it wants to be. 11010 */ 11011 public static final int EXACTLY = 1 << MODE_SHIFT; 11012 11013 /** 11014 * Measure specification mode: The child can be as large as it wants up 11015 * to the specified size. 11016 */ 11017 public static final int AT_MOST = 2 << MODE_SHIFT; 11018 11019 /** 11020 * Creates a measure specification based on the supplied size and mode. 11021 * 11022 * The mode must always be one of the following: 11023 * <ul> 11024 * <li>{@link android.view.View.MeasureSpec#UNSPECIFIED}</li> 11025 * <li>{@link android.view.View.MeasureSpec#EXACTLY}</li> 11026 * <li>{@link android.view.View.MeasureSpec#AT_MOST}</li> 11027 * </ul> 11028 * 11029 * @param size the size of the measure specification 11030 * @param mode the mode of the measure specification 11031 * @return the measure specification based on size and mode 11032 */ 11033 public static int makeMeasureSpec(int size, int mode) { 11034 return size + mode; 11035 } 11036 11037 /** 11038 * Extracts the mode from the supplied measure specification. 11039 * 11040 * @param measureSpec the measure specification to extract the mode from 11041 * @return {@link android.view.View.MeasureSpec#UNSPECIFIED}, 11042 * {@link android.view.View.MeasureSpec#AT_MOST} or 11043 * {@link android.view.View.MeasureSpec#EXACTLY} 11044 */ 11045 public static int getMode(int measureSpec) { 11046 return (measureSpec & MODE_MASK); 11047 } 11048 11049 /** 11050 * Extracts the size from the supplied measure specification. 11051 * 11052 * @param measureSpec the measure specification to extract the size from 11053 * @return the size in pixels defined in the supplied measure specification 11054 */ 11055 public static int getSize(int measureSpec) { 11056 return (measureSpec & ~MODE_MASK); 11057 } 11058 11059 /** 11060 * Returns a String representation of the specified measure 11061 * specification. 11062 * 11063 * @param measureSpec the measure specification to convert to a String 11064 * @return a String with the following format: "MeasureSpec: MODE SIZE" 11065 */ 11066 public static String toString(int measureSpec) { 11067 int mode = getMode(measureSpec); 11068 int size = getSize(measureSpec); 11069 11070 StringBuilder sb = new StringBuilder("MeasureSpec: "); 11071 11072 if (mode == UNSPECIFIED) 11073 sb.append("UNSPECIFIED "); 11074 else if (mode == EXACTLY) 11075 sb.append("EXACTLY "); 11076 else if (mode == AT_MOST) 11077 sb.append("AT_MOST "); 11078 else 11079 sb.append(mode).append(" "); 11080 11081 sb.append(size); 11082 return sb.toString(); 11083 } 11084 } 11085 11086 class CheckForLongPress implements Runnable { 11087 11088 private int mOriginalWindowAttachCount; 11089 11090 public void run() { 11091 if (isPressed() && (mParent != null) 11092 && mOriginalWindowAttachCount == mWindowAttachCount) { 11093 if (performLongClick()) { 11094 mHasPerformedLongPress = true; 11095 } 11096 } 11097 } 11098 11099 public void rememberWindowAttachCount() { 11100 mOriginalWindowAttachCount = mWindowAttachCount; 11101 } 11102 } 11103 11104 private final class CheckForTap implements Runnable { 11105 public void run() { 11106 mPrivateFlags &= ~PREPRESSED; 11107 mPrivateFlags |= PRESSED; 11108 refreshDrawableState(); 11109 if ((mViewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) { 11110 postCheckForLongClick(ViewConfiguration.getTapTimeout()); 11111 } 11112 } 11113 } 11114 11115 private final class PerformClick implements Runnable { 11116 public void run() { 11117 performClick(); 11118 } 11119 } 11120 11121 /** 11122 * Interface definition for a callback to be invoked when a key event is 11123 * dispatched to this view. The callback will be invoked before the key 11124 * event is given to the view. 11125 */ 11126 public interface OnKeyListener { 11127 /** 11128 * Called when a key is dispatched to a view. This allows listeners to 11129 * get a chance to respond before the target view. 11130 * 11131 * @param v The view the key has been dispatched to. 11132 * @param keyCode The code for the physical key that was pressed 11133 * @param event The KeyEvent object containing full information about 11134 * the event. 11135 * @return True if the listener has consumed the event, false otherwise. 11136 */ 11137 boolean onKey(View v, int keyCode, KeyEvent event); 11138 } 11139 11140 /** 11141 * Interface definition for a callback to be invoked when a touch event is 11142 * dispatched to this view. The callback will be invoked before the touch 11143 * event is given to the view. 11144 */ 11145 public interface OnTouchListener { 11146 /** 11147 * Called when a touch event is dispatched to a view. This allows listeners to 11148 * get a chance to respond before the target view. 11149 * 11150 * @param v The view the touch event has been dispatched to. 11151 * @param event The MotionEvent object containing full information about 11152 * the event. 11153 * @return True if the listener has consumed the event, false otherwise. 11154 */ 11155 boolean onTouch(View v, MotionEvent event); 11156 } 11157 11158 /** 11159 * Interface definition for a callback to be invoked when a view has been clicked and held. 11160 */ 11161 public interface OnLongClickListener { 11162 /** 11163 * Called when a view has been clicked and held. 11164 * 11165 * @param v The view that was clicked and held. 11166 * 11167 * @return true if the callback consumed the long click, false otherwise. 11168 */ 11169 boolean onLongClick(View v); 11170 } 11171 11172 /** 11173 * Interface definition for a callback to be invoked when a drag is being dispatched 11174 * to this view. The callback will be invoked before the hosting view's own 11175 * onDrag(event) method. If the listener wants to fall back to the hosting view's 11176 * onDrag(event) behavior, it should return 'false' from this callback. 11177 */ 11178 public interface OnDragListener { 11179 /** 11180 * Called when a drag event is dispatched to a view. This allows listeners 11181 * to get a chance to override base View behavior. 11182 * 11183 * @param v The view the drag has been dispatched to. 11184 * @param event The DragEvent object containing full information 11185 * about the event. 11186 * @return true if the listener consumed the DragEvent, false in order to fall 11187 * back to the view's default handling. 11188 */ 11189 boolean onDrag(View v, DragEvent event); 11190 } 11191 11192 /** 11193 * Interface definition for a callback to be invoked when the focus state of 11194 * a view changed. 11195 */ 11196 public interface OnFocusChangeListener { 11197 /** 11198 * Called when the focus state of a view has changed. 11199 * 11200 * @param v The view whose state has changed. 11201 * @param hasFocus The new focus state of v. 11202 */ 11203 void onFocusChange(View v, boolean hasFocus); 11204 } 11205 11206 /** 11207 * Interface definition for a callback to be invoked when a view is clicked. 11208 */ 11209 public interface OnClickListener { 11210 /** 11211 * Called when a view has been clicked. 11212 * 11213 * @param v The view that was clicked. 11214 */ 11215 void onClick(View v); 11216 } 11217 11218 /** 11219 * Interface definition for a callback to be invoked when the context menu 11220 * for this view is being built. 11221 */ 11222 public interface OnCreateContextMenuListener { 11223 /** 11224 * Called when the context menu for this view is being built. It is not 11225 * safe to hold onto the menu after this method returns. 11226 * 11227 * @param menu The context menu that is being built 11228 * @param v The view for which the context menu is being built 11229 * @param menuInfo Extra information about the item for which the 11230 * context menu should be shown. This information will vary 11231 * depending on the class of v. 11232 */ 11233 void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo); 11234 } 11235 11236 private final class UnsetPressedState implements Runnable { 11237 public void run() { 11238 setPressed(false); 11239 } 11240 } 11241 11242 /** 11243 * Base class for derived classes that want to save and restore their own 11244 * state in {@link android.view.View#onSaveInstanceState()}. 11245 */ 11246 public static class BaseSavedState extends AbsSavedState { 11247 /** 11248 * Constructor used when reading from a parcel. Reads the state of the superclass. 11249 * 11250 * @param source 11251 */ 11252 public BaseSavedState(Parcel source) { 11253 super(source); 11254 } 11255 11256 /** 11257 * Constructor called by derived classes when creating their SavedState objects 11258 * 11259 * @param superState The state of the superclass of this view 11260 */ 11261 public BaseSavedState(Parcelable superState) { 11262 super(superState); 11263 } 11264 11265 public static final Parcelable.Creator<BaseSavedState> CREATOR = 11266 new Parcelable.Creator<BaseSavedState>() { 11267 public BaseSavedState createFromParcel(Parcel in) { 11268 return new BaseSavedState(in); 11269 } 11270 11271 public BaseSavedState[] newArray(int size) { 11272 return new BaseSavedState[size]; 11273 } 11274 }; 11275 } 11276 11277 /** 11278 * A set of information given to a view when it is attached to its parent 11279 * window. 11280 */ 11281 static class AttachInfo { 11282 interface Callbacks { 11283 void playSoundEffect(int effectId); 11284 boolean performHapticFeedback(int effectId, boolean always); 11285 } 11286 11287 /** 11288 * InvalidateInfo is used to post invalidate(int, int, int, int) messages 11289 * to a Handler. This class contains the target (View) to invalidate and 11290 * the coordinates of the dirty rectangle. 11291 * 11292 * For performance purposes, this class also implements a pool of up to 11293 * POOL_LIMIT objects that get reused. This reduces memory allocations 11294 * whenever possible. 11295 */ 11296 static class InvalidateInfo implements Poolable<InvalidateInfo> { 11297 private static final int POOL_LIMIT = 10; 11298 private static final Pool<InvalidateInfo> sPool = Pools.synchronizedPool( 11299 Pools.finitePool(new PoolableManager<InvalidateInfo>() { 11300 public InvalidateInfo newInstance() { 11301 return new InvalidateInfo(); 11302 } 11303 11304 public void onAcquired(InvalidateInfo element) { 11305 } 11306 11307 public void onReleased(InvalidateInfo element) { 11308 } 11309 }, POOL_LIMIT) 11310 ); 11311 11312 private InvalidateInfo mNext; 11313 11314 View target; 11315 11316 int left; 11317 int top; 11318 int right; 11319 int bottom; 11320 11321 public void setNextPoolable(InvalidateInfo element) { 11322 mNext = element; 11323 } 11324 11325 public InvalidateInfo getNextPoolable() { 11326 return mNext; 11327 } 11328 11329 static InvalidateInfo acquire() { 11330 return sPool.acquire(); 11331 } 11332 11333 void release() { 11334 sPool.release(this); 11335 } 11336 } 11337 11338 final IWindowSession mSession; 11339 11340 final IWindow mWindow; 11341 11342 final IBinder mWindowToken; 11343 11344 final Callbacks mRootCallbacks; 11345 11346 /** 11347 * The top view of the hierarchy. 11348 */ 11349 View mRootView; 11350 11351 IBinder mPanelParentWindowToken; 11352 Surface mSurface; 11353 11354 boolean mHardwareAccelerated; 11355 boolean mHardwareAccelerationRequested; 11356 HardwareRenderer mHardwareRenderer; 11357 11358 /** 11359 * Scale factor used by the compatibility mode 11360 */ 11361 float mApplicationScale; 11362 11363 /** 11364 * Indicates whether the application is in compatibility mode 11365 */ 11366 boolean mScalingRequired; 11367 11368 /** 11369 * Left position of this view's window 11370 */ 11371 int mWindowLeft; 11372 11373 /** 11374 * Top position of this view's window 11375 */ 11376 int mWindowTop; 11377 11378 /** 11379 * Indicates whether views need to use 32-bit drawing caches 11380 */ 11381 boolean mUse32BitDrawingCache; 11382 11383 /** 11384 * For windows that are full-screen but using insets to layout inside 11385 * of the screen decorations, these are the current insets for the 11386 * content of the window. 11387 */ 11388 final Rect mContentInsets = new Rect(); 11389 11390 /** 11391 * For windows that are full-screen but using insets to layout inside 11392 * of the screen decorations, these are the current insets for the 11393 * actual visible parts of the window. 11394 */ 11395 final Rect mVisibleInsets = new Rect(); 11396 11397 /** 11398 * The internal insets given by this window. This value is 11399 * supplied by the client (through 11400 * {@link ViewTreeObserver.OnComputeInternalInsetsListener}) and will 11401 * be given to the window manager when changed to be used in laying 11402 * out windows behind it. 11403 */ 11404 final ViewTreeObserver.InternalInsetsInfo mGivenInternalInsets 11405 = new ViewTreeObserver.InternalInsetsInfo(); 11406 11407 /** 11408 * All views in the window's hierarchy that serve as scroll containers, 11409 * used to determine if the window can be resized or must be panned 11410 * to adjust for a soft input area. 11411 */ 11412 final ArrayList<View> mScrollContainers = new ArrayList<View>(); 11413 11414 final KeyEvent.DispatcherState mKeyDispatchState 11415 = new KeyEvent.DispatcherState(); 11416 11417 /** 11418 * Indicates whether the view's window currently has the focus. 11419 */ 11420 boolean mHasWindowFocus; 11421 11422 /** 11423 * The current visibility of the window. 11424 */ 11425 int mWindowVisibility; 11426 11427 /** 11428 * Indicates the time at which drawing started to occur. 11429 */ 11430 long mDrawingTime; 11431 11432 /** 11433 * Indicates whether or not ignoring the DIRTY_MASK flags. 11434 */ 11435 boolean mIgnoreDirtyState; 11436 11437 /** 11438 * Indicates whether the view's window is currently in touch mode. 11439 */ 11440 boolean mInTouchMode; 11441 11442 /** 11443 * Indicates that ViewRoot should trigger a global layout change 11444 * the next time it performs a traversal 11445 */ 11446 boolean mRecomputeGlobalAttributes; 11447 11448 /** 11449 * Set during a traveral if any views want to keep the screen on. 11450 */ 11451 boolean mKeepScreenOn; 11452 11453 /** 11454 * Set if the visibility of any views has changed. 11455 */ 11456 boolean mViewVisibilityChanged; 11457 11458 /** 11459 * Set to true if a view has been scrolled. 11460 */ 11461 boolean mViewScrollChanged; 11462 11463 /** 11464 * Global to the view hierarchy used as a temporary for dealing with 11465 * x/y points in the transparent region computations. 11466 */ 11467 final int[] mTransparentLocation = new int[2]; 11468 11469 /** 11470 * Global to the view hierarchy used as a temporary for dealing with 11471 * x/y points in the ViewGroup.invalidateChild implementation. 11472 */ 11473 final int[] mInvalidateChildLocation = new int[2]; 11474 11475 11476 /** 11477 * Global to the view hierarchy used as a temporary for dealing with 11478 * x/y location when view is transformed. 11479 */ 11480 final float[] mTmpTransformLocation = new float[2]; 11481 11482 /** 11483 * The view tree observer used to dispatch global events like 11484 * layout, pre-draw, touch mode change, etc. 11485 */ 11486 final ViewTreeObserver mTreeObserver = new ViewTreeObserver(); 11487 11488 /** 11489 * A Canvas used by the view hierarchy to perform bitmap caching. 11490 */ 11491 Canvas mCanvas; 11492 11493 /** 11494 * A Handler supplied by a view's {@link android.view.ViewRoot}. This 11495 * handler can be used to pump events in the UI events queue. 11496 */ 11497 final Handler mHandler; 11498 11499 /** 11500 * Identifier for messages requesting the view to be invalidated. 11501 * Such messages should be sent to {@link #mHandler}. 11502 */ 11503 static final int INVALIDATE_MSG = 0x1; 11504 11505 /** 11506 * Identifier for messages requesting the view to invalidate a region. 11507 * Such messages should be sent to {@link #mHandler}. 11508 */ 11509 static final int INVALIDATE_RECT_MSG = 0x2; 11510 11511 /** 11512 * Temporary for use in computing invalidate rectangles while 11513 * calling up the hierarchy. 11514 */ 11515 final Rect mTmpInvalRect = new Rect(); 11516 11517 /** 11518 * Temporary for use in computing hit areas with transformed views 11519 */ 11520 final RectF mTmpTransformRect = new RectF(); 11521 11522 /** 11523 * Temporary list for use in collecting focusable descendents of a view. 11524 */ 11525 final ArrayList<View> mFocusablesTempList = new ArrayList<View>(24); 11526 11527 /** 11528 * Creates a new set of attachment information with the specified 11529 * events handler and thread. 11530 * 11531 * @param handler the events handler the view must use 11532 */ 11533 AttachInfo(IWindowSession session, IWindow window, 11534 Handler handler, Callbacks effectPlayer) { 11535 mSession = session; 11536 mWindow = window; 11537 mWindowToken = window.asBinder(); 11538 mHandler = handler; 11539 mRootCallbacks = effectPlayer; 11540 } 11541 } 11542 11543 /** 11544 * <p>ScrollabilityCache holds various fields used by a View when scrolling 11545 * is supported. This avoids keeping too many unused fields in most 11546 * instances of View.</p> 11547 */ 11548 private static class ScrollabilityCache implements Runnable { 11549 11550 /** 11551 * Scrollbars are not visible 11552 */ 11553 public static final int OFF = 0; 11554 11555 /** 11556 * Scrollbars are visible 11557 */ 11558 public static final int ON = 1; 11559 11560 /** 11561 * Scrollbars are fading away 11562 */ 11563 public static final int FADING = 2; 11564 11565 public boolean fadeScrollBars; 11566 11567 public int fadingEdgeLength; 11568 public int scrollBarDefaultDelayBeforeFade; 11569 public int scrollBarFadeDuration; 11570 11571 public int scrollBarSize; 11572 public ScrollBarDrawable scrollBar; 11573 public float[] interpolatorValues; 11574 public View host; 11575 11576 public final Paint paint; 11577 public final Matrix matrix; 11578 public Shader shader; 11579 11580 public final Interpolator scrollBarInterpolator = new Interpolator(1, 2); 11581 11582 private static final float[] OPAQUE = { 255 }; 11583 private static final float[] TRANSPARENT = { 0.0f }; 11584 11585 /** 11586 * When fading should start. This time moves into the future every time 11587 * a new scroll happens. Measured based on SystemClock.uptimeMillis() 11588 */ 11589 public long fadeStartTime; 11590 11591 11592 /** 11593 * The current state of the scrollbars: ON, OFF, or FADING 11594 */ 11595 public int state = OFF; 11596 11597 private int mLastColor; 11598 11599 public ScrollabilityCache(ViewConfiguration configuration, View host) { 11600 fadingEdgeLength = configuration.getScaledFadingEdgeLength(); 11601 scrollBarSize = configuration.getScaledScrollBarSize(); 11602 scrollBarDefaultDelayBeforeFade = ViewConfiguration.getScrollDefaultDelay(); 11603 scrollBarFadeDuration = ViewConfiguration.getScrollBarFadeDuration(); 11604 11605 paint = new Paint(); 11606 matrix = new Matrix(); 11607 // use use a height of 1, and then wack the matrix each time we 11608 // actually use it. 11609 shader = new LinearGradient(0, 0, 0, 1, 0xFF000000, 0, Shader.TileMode.CLAMP); 11610 11611 paint.setShader(shader); 11612 paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT)); 11613 this.host = host; 11614 } 11615 11616 public void setFadeColor(int color) { 11617 if (color != 0 && color != mLastColor) { 11618 mLastColor = color; 11619 color |= 0xFF000000; 11620 11621 shader = new LinearGradient(0, 0, 0, 1, color | 0xFF000000, 11622 color & 0x00FFFFFF, Shader.TileMode.CLAMP); 11623 11624 paint.setShader(shader); 11625 // Restore the default transfer mode (src_over) 11626 paint.setXfermode(null); 11627 } 11628 } 11629 11630 public void run() { 11631 long now = AnimationUtils.currentAnimationTimeMillis(); 11632 if (now >= fadeStartTime) { 11633 11634 // the animation fades the scrollbars out by changing 11635 // the opacity (alpha) from fully opaque to fully 11636 // transparent 11637 int nextFrame = (int) now; 11638 int framesCount = 0; 11639 11640 Interpolator interpolator = scrollBarInterpolator; 11641 11642 // Start opaque 11643 interpolator.setKeyFrame(framesCount++, nextFrame, OPAQUE); 11644 11645 // End transparent 11646 nextFrame += scrollBarFadeDuration; 11647 interpolator.setKeyFrame(framesCount, nextFrame, TRANSPARENT); 11648 11649 state = FADING; 11650 11651 // Kick off the fade animation 11652 host.invalidate(); 11653 } 11654 } 11655 11656 } 11657} 11658