ViewGroup.java revision 70cb4f3e7131cda1e58c1f6d422e296c4935289d
1/* 2 * Copyright (C) 2006 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17package android.view; 18 19import android.animation.LayoutTransition; 20import android.content.Context; 21import android.content.pm.PackageManager; 22import android.content.res.Configuration; 23import android.content.res.TypedArray; 24import android.graphics.Bitmap; 25import android.graphics.Canvas; 26import android.graphics.Color; 27import android.graphics.Insets; 28import android.graphics.Matrix; 29import android.graphics.Paint; 30import android.graphics.PointF; 31import android.graphics.Rect; 32import android.graphics.RectF; 33import android.graphics.Region; 34import android.os.Build; 35import android.os.Parcelable; 36import android.os.SystemClock; 37import android.util.AttributeSet; 38import android.util.Log; 39import android.util.Pools.SynchronizedPool; 40import android.util.SparseArray; 41import android.view.accessibility.AccessibilityEvent; 42import android.view.accessibility.AccessibilityNodeInfo; 43import android.view.animation.Animation; 44import android.view.animation.AnimationUtils; 45import android.view.animation.LayoutAnimationController; 46import android.view.animation.Transformation; 47 48import com.android.internal.R; 49import com.android.internal.util.Predicate; 50 51import java.util.ArrayList; 52import java.util.Collections; 53import java.util.HashSet; 54import java.util.Iterator; 55import java.util.List; 56import java.util.Map; 57import java.util.NoSuchElementException; 58 59import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1; 60 61/** 62 * <p> 63 * A <code>ViewGroup</code> is a special view that can contain other views 64 * (called children.) The view group is the base class for layouts and views 65 * containers. This class also defines the 66 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 67 * class for layouts parameters. 68 * </p> 69 * 70 * <p> 71 * Also see {@link LayoutParams} for layout attributes. 72 * </p> 73 * 74 * <div class="special reference"> 75 * <h3>Developer Guides</h3> 76 * <p>For more information about creating user interface layouts, read the 77 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 78 * guide.</p></div> 79 * 80 * <p>Here is a complete implementation of a custom ViewGroup that implements 81 * a simple {@link android.widget.FrameLayout} along with the ability to stack 82 * children in left and right gutters.</p> 83 * 84 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/CustomLayout.java 85 * Complete} 86 * 87 * <p>If you are implementing XML layout attributes as shown in the example, this is the 88 * corresponding definition for them that would go in <code>res/values/attrs.xml</code>:</p> 89 * 90 * {@sample development/samples/ApiDemos/res/values/attrs.xml CustomLayout} 91 * 92 * <p>Finally the layout manager can be used in an XML layout like so:</p> 93 * 94 * {@sample development/samples/ApiDemos/res/layout/custom_layout.xml Complete} 95 * 96 * @attr ref android.R.styleable#ViewGroup_clipChildren 97 * @attr ref android.R.styleable#ViewGroup_clipToPadding 98 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 99 * @attr ref android.R.styleable#ViewGroup_animationCache 100 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 101 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 102 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 103 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 104 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 105 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 106 * @attr ref android.R.styleable#ViewGroup_layoutMode 107 */ 108public abstract class ViewGroup extends View implements ViewParent, ViewManager { 109 private static final String TAG = "ViewGroup"; 110 111 private static final boolean DBG = false; 112 /** @hide */ 113 public static boolean DEBUG_DRAW = false; 114 115 /** 116 * Views which have been hidden or removed which need to be animated on 117 * their way out. 118 * This field should be made private, so it is hidden from the SDK. 119 * {@hide} 120 */ 121 protected ArrayList<View> mDisappearingChildren; 122 123 /** 124 * Listener used to propagate events indicating when children are added 125 * and/or removed from a view group. 126 * This field should be made private, so it is hidden from the SDK. 127 * {@hide} 128 */ 129 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 130 131 // The view contained within this ViewGroup that has or contains focus. 132 private View mFocused; 133 134 /** 135 * A Transformation used when drawing children, to 136 * apply on the child being drawn. 137 */ 138 private Transformation mChildTransformation; 139 140 /** 141 * Used to track the current invalidation region. 142 */ 143 RectF mInvalidateRegion; 144 145 /** 146 * A Transformation used to calculate a correct 147 * invalidation area when the application is autoscaled. 148 */ 149 Transformation mInvalidationTransformation; 150 151 // View currently under an ongoing drag 152 private View mCurrentDragView; 153 154 // Metadata about the ongoing drag 155 private DragEvent mCurrentDrag; 156 private HashSet<View> mDragNotifiedChildren; 157 158 // Does this group have a child that can accept the current drag payload? 159 private boolean mChildAcceptsDrag; 160 161 // Used during drag dispatch 162 private PointF mLocalPoint; 163 164 // Layout animation 165 private LayoutAnimationController mLayoutAnimationController; 166 private Animation.AnimationListener mAnimationListener; 167 168 // First touch target in the linked list of touch targets. 169 private TouchTarget mFirstTouchTarget; 170 171 // For debugging only. You can see these in hierarchyviewer. 172 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 173 @ViewDebug.ExportedProperty(category = "events") 174 private long mLastTouchDownTime; 175 @ViewDebug.ExportedProperty(category = "events") 176 private int mLastTouchDownIndex = -1; 177 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 178 @ViewDebug.ExportedProperty(category = "events") 179 private float mLastTouchDownX; 180 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 181 @ViewDebug.ExportedProperty(category = "events") 182 private float mLastTouchDownY; 183 184 // First hover target in the linked list of hover targets. 185 // The hover targets are children which have received ACTION_HOVER_ENTER. 186 // They might not have actually handled the hover event, but we will 187 // continue sending hover events to them as long as the pointer remains over 188 // their bounds and the view group does not intercept hover. 189 private HoverTarget mFirstHoverTarget; 190 191 // True if the view group itself received a hover event. 192 // It might not have actually handled the hover event. 193 private boolean mHoveredSelf; 194 195 /** 196 * Internal flags. 197 * 198 * This field should be made private, so it is hidden from the SDK. 199 * {@hide} 200 */ 201 @ViewDebug.ExportedProperty(flagMapping = { 202 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 203 name = "CLIP_CHILDREN"), 204 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 205 name = "CLIP_TO_PADDING"), 206 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 207 name = "PADDING_NOT_NULL") 208 }, formatToHexString = true) 209 protected int mGroupFlags; 210 211 /** 212 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 213 */ 214 private int mLayoutMode = LAYOUT_MODE_UNDEFINED; 215 216 /** 217 * NOTE: If you change the flags below make sure to reflect the changes 218 * the DisplayList class 219 */ 220 221 // When set, ViewGroup invalidates only the child's rectangle 222 // Set by default 223 static final int FLAG_CLIP_CHILDREN = 0x1; 224 225 // When set, ViewGroup excludes the padding area from the invalidate rectangle 226 // Set by default 227 private static final int FLAG_CLIP_TO_PADDING = 0x2; 228 229 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 230 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 231 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 232 233 // When set, dispatchDraw() will run the layout animation and unset the flag 234 private static final int FLAG_RUN_ANIMATION = 0x8; 235 236 // When set, there is either no layout animation on the ViewGroup or the layout 237 // animation is over 238 // Set by default 239 static final int FLAG_ANIMATION_DONE = 0x10; 240 241 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 242 // to clip it, even if FLAG_CLIP_TO_PADDING is set 243 private static final int FLAG_PADDING_NOT_NULL = 0x20; 244 245 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 246 // Set by default 247 private static final int FLAG_ANIMATION_CACHE = 0x40; 248 249 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 250 // layout animation; this avoid clobbering the hierarchy 251 // Automatically set when the layout animation starts, depending on the animation's 252 // characteristics 253 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 254 255 // When set, the next call to drawChild() will clear mChildTransformation's matrix 256 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 257 258 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 259 // the children's Bitmap caches if necessary 260 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 261 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 262 263 /** 264 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 265 * to get the index of the child to draw for that iteration. 266 * 267 * @hide 268 */ 269 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 270 271 /** 272 * When set, this ViewGroup supports static transformations on children; this causes 273 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 274 * invoked when a child is drawn. 275 * 276 * Any subclass overriding 277 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 278 * set this flags in {@link #mGroupFlags}. 279 * 280 * {@hide} 281 */ 282 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 283 284 // UNUSED FLAG VALUE: 0x1000; 285 286 /** 287 * When set, this ViewGroup's drawable states also include those 288 * of its children. 289 */ 290 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 291 292 /** 293 * When set, this ViewGroup tries to always draw its children using their drawing cache. 294 */ 295 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 296 297 /** 298 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 299 * draw its children with their drawing cache. 300 */ 301 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 302 303 /** 304 * When set, this group will go through its list of children to notify them of 305 * any drawable state change. 306 */ 307 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 308 309 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 310 311 /** 312 * This view will get focus before any of its descendants. 313 */ 314 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 315 316 /** 317 * This view will get focus only if none of its descendants want it. 318 */ 319 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 320 321 /** 322 * This view will block any of its descendants from getting focus, even 323 * if they are focusable. 324 */ 325 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 326 327 /** 328 * Used to map between enum in attrubutes and flag values. 329 */ 330 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 331 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 332 FOCUS_BLOCK_DESCENDANTS}; 333 334 /** 335 * When set, this ViewGroup should not intercept touch events. 336 * {@hide} 337 */ 338 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 339 340 /** 341 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 342 */ 343 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 344 345 /** 346 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 347 * to children when adding new views. This is used to prevent multiple 348 * onAttached calls when a ViewGroup adds children in its own onAttached method. 349 */ 350 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 351 352 /** 353 * When true, indicates that a layoutMode has been explicitly set, either with 354 * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. 355 * This distinguishes the situation in which a layout mode was inherited from 356 * one of the ViewGroup's ancestors and cached locally. 357 */ 358 private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; 359 360 static final int FLAG_IS_TRANSITION_GROUP = 0x1000000; 361 362 static final int FLAG_IS_TRANSITION_GROUP_SET = 0x2000000; 363 364 /** 365 * When set, focus will not be permitted to enter this group if a touchscreen is present. 366 */ 367 static final int FLAG_TOUCHSCREEN_BLOCKS_FOCUS = 0x4000000; 368 369 /** 370 * Indicates which types of drawing caches are to be kept in memory. 371 * This field should be made private, so it is hidden from the SDK. 372 * {@hide} 373 */ 374 protected int mPersistentDrawingCache; 375 376 /** 377 * Used to indicate that no drawing cache should be kept in memory. 378 */ 379 public static final int PERSISTENT_NO_CACHE = 0x0; 380 381 /** 382 * Used to indicate that the animation drawing cache should be kept in memory. 383 */ 384 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 385 386 /** 387 * Used to indicate that the scrolling drawing cache should be kept in memory. 388 */ 389 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 390 391 /** 392 * Used to indicate that all drawing caches should be kept in memory. 393 */ 394 public static final int PERSISTENT_ALL_CACHES = 0x3; 395 396 // Layout Modes 397 398 private static final int LAYOUT_MODE_UNDEFINED = -1; 399 400 /** 401 * This constant is a {@link #setLayoutMode(int) layoutMode}. 402 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 403 * {@link #getRight() right} and {@link #getBottom() bottom}. 404 */ 405 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 406 407 /** 408 * This constant is a {@link #setLayoutMode(int) layoutMode}. 409 * Optical bounds describe where a widget appears to be. They sit inside the clip 410 * bounds which need to cover a larger area to allow other effects, 411 * such as shadows and glows, to be drawn. 412 */ 413 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 414 415 /** @hide */ 416 public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; 417 418 /** 419 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 420 * are set at the same time. 421 */ 422 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 423 424 // Index of the child's left position in the mLocation array 425 private static final int CHILD_LEFT_INDEX = 0; 426 // Index of the child's top position in the mLocation array 427 private static final int CHILD_TOP_INDEX = 1; 428 429 // Child views of this ViewGroup 430 private View[] mChildren; 431 // Number of valid children in the mChildren array, the rest should be null or not 432 // considered as children 433 private int mChildrenCount; 434 435 // Whether layout calls are currently being suppressed, controlled by calls to 436 // suppressLayout() 437 boolean mSuppressLayout = false; 438 439 // Whether any layout calls have actually been suppressed while mSuppressLayout 440 // has been true. This tracks whether we need to issue a requestLayout() when 441 // layout is later re-enabled. 442 private boolean mLayoutCalledWhileSuppressed = false; 443 444 private static final int ARRAY_INITIAL_CAPACITY = 12; 445 private static final int ARRAY_CAPACITY_INCREMENT = 12; 446 447 private static Paint sDebugPaint; 448 private static float[] sDebugLines; 449 450 // Used to draw cached views 451 Paint mCachePaint; 452 453 // Used to animate add/remove changes in layout 454 private LayoutTransition mTransition; 455 456 // The set of views that are currently being transitioned. This list is used to track views 457 // being removed that should not actually be removed from the parent yet because they are 458 // being animated. 459 private ArrayList<View> mTransitioningViews; 460 461 // List of children changing visibility. This is used to potentially keep rendering 462 // views during a transition when they otherwise would have become gone/invisible 463 private ArrayList<View> mVisibilityChangingChildren; 464 465 // Temporary holder of presorted children, only used for 466 // input/software draw dispatch for correctly Z ordering. 467 private ArrayList<View> mPreSortedChildren; 468 469 // Indicates how many of this container's child subtrees contain transient state 470 @ViewDebug.ExportedProperty(category = "layout") 471 private int mChildCountWithTransientState = 0; 472 473 // Iterator over the children in decreasing Z order (top children first). 474 private OrderedChildIterator mOrderedChildIterator; 475 476 /** 477 * Currently registered axes for nested scrolling. Flag set consisting of 478 * {@link #SCROLL_AXIS_HORIZONTAL} {@link #SCROLL_AXIS_VERTICAL} or {@link #SCROLL_AXIS_NONE} 479 * for null. 480 */ 481 private int mNestedScrollAxes; 482 483 public ViewGroup(Context context) { 484 this(context, null); 485 } 486 487 public ViewGroup(Context context, AttributeSet attrs) { 488 this(context, attrs, 0); 489 } 490 491 public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr) { 492 this(context, attrs, defStyleAttr, 0); 493 } 494 495 public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 496 super(context, attrs, defStyleAttr, defStyleRes); 497 initViewGroup(); 498 initFromAttributes(context, attrs, defStyleAttr, defStyleRes); 499 } 500 501 private boolean debugDraw() { 502 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 503 } 504 505 private void initViewGroup() { 506 // ViewGroup doesn't draw by default 507 if (!debugDraw()) { 508 setFlags(WILL_NOT_DRAW, DRAW_MASK); 509 } 510 mGroupFlags |= FLAG_CLIP_CHILDREN; 511 mGroupFlags |= FLAG_CLIP_TO_PADDING; 512 mGroupFlags |= FLAG_ANIMATION_DONE; 513 mGroupFlags |= FLAG_ANIMATION_CACHE; 514 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 515 516 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 517 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 518 } 519 520 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 521 522 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 523 mChildrenCount = 0; 524 525 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 526 } 527 528 private void initFromAttributes( 529 Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 530 final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ViewGroup, defStyleAttr, 531 defStyleRes); 532 533 final int N = a.getIndexCount(); 534 for (int i = 0; i < N; i++) { 535 int attr = a.getIndex(i); 536 switch (attr) { 537 case R.styleable.ViewGroup_clipChildren: 538 setClipChildren(a.getBoolean(attr, true)); 539 break; 540 case R.styleable.ViewGroup_clipToPadding: 541 setClipToPadding(a.getBoolean(attr, true)); 542 break; 543 case R.styleable.ViewGroup_animationCache: 544 setAnimationCacheEnabled(a.getBoolean(attr, true)); 545 break; 546 case R.styleable.ViewGroup_persistentDrawingCache: 547 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 548 break; 549 case R.styleable.ViewGroup_addStatesFromChildren: 550 setAddStatesFromChildren(a.getBoolean(attr, false)); 551 break; 552 case R.styleable.ViewGroup_alwaysDrawnWithCache: 553 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 554 break; 555 case R.styleable.ViewGroup_layoutAnimation: 556 int id = a.getResourceId(attr, -1); 557 if (id > 0) { 558 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 559 } 560 break; 561 case R.styleable.ViewGroup_descendantFocusability: 562 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 563 break; 564 case R.styleable.ViewGroup_splitMotionEvents: 565 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 566 break; 567 case R.styleable.ViewGroup_animateLayoutChanges: 568 boolean animateLayoutChanges = a.getBoolean(attr, false); 569 if (animateLayoutChanges) { 570 setLayoutTransition(new LayoutTransition()); 571 } 572 break; 573 case R.styleable.ViewGroup_layoutMode: 574 setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); 575 break; 576 case R.styleable.ViewGroup_transitionGroup: 577 setTransitionGroup(a.getBoolean(attr, false)); 578 break; 579 case R.styleable.ViewGroup_touchscreenBlocksFocus: 580 setTouchscreenBlocksFocus(a.getBoolean(attr, false)); 581 break; 582 } 583 } 584 585 a.recycle(); 586 } 587 588 /** 589 * Gets the descendant focusability of this view group. The descendant 590 * focusability defines the relationship between this view group and its 591 * descendants when looking for a view to take focus in 592 * {@link #requestFocus(int, android.graphics.Rect)}. 593 * 594 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 595 * {@link #FOCUS_BLOCK_DESCENDANTS}. 596 */ 597 @ViewDebug.ExportedProperty(category = "focus", mapping = { 598 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 599 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 600 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 601 }) 602 public int getDescendantFocusability() { 603 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 604 } 605 606 /** 607 * Set the descendant focusability of this view group. This defines the relationship 608 * between this view group and its descendants when looking for a view to 609 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 610 * 611 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 612 * {@link #FOCUS_BLOCK_DESCENDANTS}. 613 */ 614 public void setDescendantFocusability(int focusability) { 615 switch (focusability) { 616 case FOCUS_BEFORE_DESCENDANTS: 617 case FOCUS_AFTER_DESCENDANTS: 618 case FOCUS_BLOCK_DESCENDANTS: 619 break; 620 default: 621 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 622 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 623 } 624 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 625 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 626 } 627 628 /** 629 * {@inheritDoc} 630 */ 631 @Override 632 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 633 if (mFocused != null) { 634 mFocused.unFocus(this); 635 mFocused = null; 636 } 637 super.handleFocusGainInternal(direction, previouslyFocusedRect); 638 } 639 640 /** 641 * {@inheritDoc} 642 */ 643 public void requestChildFocus(View child, View focused) { 644 if (DBG) { 645 System.out.println(this + " requestChildFocus()"); 646 } 647 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 648 return; 649 } 650 651 // Unfocus us, if necessary 652 super.unFocus(focused); 653 654 // We had a previous notion of who had focus. Clear it. 655 if (mFocused != child) { 656 if (mFocused != null) { 657 mFocused.unFocus(focused); 658 } 659 660 mFocused = child; 661 } 662 if (mParent != null) { 663 mParent.requestChildFocus(this, focused); 664 } 665 } 666 667 /** 668 * {@inheritDoc} 669 */ 670 public void focusableViewAvailable(View v) { 671 if (mParent != null 672 // shortcut: don't report a new focusable view if we block our descendants from 673 // getting focus 674 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 675 && (isFocusableInTouchMode() || !shouldBlockFocusForTouchscreen()) 676 // shortcut: don't report a new focusable view if we already are focused 677 // (and we don't prefer our descendants) 678 // 679 // note: knowing that mFocused is non-null is not a good enough reason 680 // to break the traversal since in that case we'd actually have to find 681 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 682 // an ancestor of v; this will get checked for at ViewAncestor 683 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 684 mParent.focusableViewAvailable(v); 685 } 686 } 687 688 /** 689 * {@inheritDoc} 690 */ 691 public boolean showContextMenuForChild(View originalView) { 692 return mParent != null && mParent.showContextMenuForChild(originalView); 693 } 694 695 /** 696 * {@inheritDoc} 697 */ 698 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 699 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 700 } 701 702 /** 703 * Find the nearest view in the specified direction that wants to take 704 * focus. 705 * 706 * @param focused The view that currently has focus 707 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 708 * FOCUS_RIGHT, or 0 for not applicable. 709 */ 710 public View focusSearch(View focused, int direction) { 711 if (isRootNamespace()) { 712 // root namespace means we should consider ourselves the top of the 713 // tree for focus searching; otherwise we could be focus searching 714 // into other tabs. see LocalActivityManager and TabHost for more info 715 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 716 } else if (mParent != null) { 717 return mParent.focusSearch(focused, direction); 718 } 719 return null; 720 } 721 722 /** 723 * {@inheritDoc} 724 */ 725 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 726 return false; 727 } 728 729 /** 730 * {@inheritDoc} 731 */ 732 @Override 733 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 734 ViewParent parent = mParent; 735 if (parent == null) { 736 return false; 737 } 738 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 739 if (!propagate) { 740 return false; 741 } 742 return parent.requestSendAccessibilityEvent(this, event); 743 } 744 745 /** 746 * Called when a child has requested sending an {@link AccessibilityEvent} and 747 * gives an opportunity to its parent to augment the event. 748 * <p> 749 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 750 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 751 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 752 * is responsible for handling this call. 753 * </p> 754 * 755 * @param child The child which requests sending the event. 756 * @param event The event to be sent. 757 * @return True if the event should be sent. 758 * 759 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 760 */ 761 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 762 if (mAccessibilityDelegate != null) { 763 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 764 } else { 765 return onRequestSendAccessibilityEventInternal(child, event); 766 } 767 } 768 769 /** 770 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 771 * 772 * Note: Called from the default {@link View.AccessibilityDelegate}. 773 */ 774 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 775 return true; 776 } 777 778 /** 779 * Translates the given bounds and intersections from child coordinates to 780 * local coordinates. In case any interactive sibling of the calling child 781 * covers the latter, a new intersections is added to the intersection list. 782 * This method is for the exclusive use by the accessibility layer to compute 783 * a point where a sequence of down and up events would click on a view. 784 * 785 * @param child The child making the call. 786 * @param bounds The bounds to translate in child coordinates. 787 * @param intersections The intersections of interactive views covering the child. 788 * @return True if the bounds and intersections were computed, false otherwise. 789 */ 790 boolean translateBoundsAndIntersectionsInWindowCoordinates(View child, 791 RectF bounds, List<RectF> intersections) { 792 // Not attached, done. 793 if (mAttachInfo == null) { 794 return false; 795 } 796 797 if (getAlpha() <= 0 || getTransitionAlpha() <= 0 || 798 getVisibility() != VISIBLE) { 799 // Cannot click on a view with an invisible predecessor. 800 return false; 801 } 802 803 // Compensate for the child transformation. 804 if (!child.hasIdentityMatrix()) { 805 Matrix matrix = child.getMatrix(); 806 matrix.mapRect(bounds); 807 final int intersectionCount = intersections.size(); 808 for (int i = 0; i < intersectionCount; i++) { 809 RectF intersection = intersections.get(i); 810 matrix.mapRect(intersection); 811 } 812 } 813 814 // Translate the bounds from child to parent coordinates. 815 final int dx = child.mLeft - mScrollX; 816 final int dy = child.mTop - mScrollY; 817 bounds.offset(dx, dy); 818 offsetRects(intersections, dx, dy); 819 820 // If the bounds do not intersect our bounds, done. 821 if (!bounds.intersects(0, 0, getWidth(), getHeight())) { 822 return false; 823 } 824 825 Iterator<View> iterator = obtainOrderedChildIterator(); 826 while (iterator.hasNext()) { 827 View sibling = iterator.next(); 828 829 // We care only about siblings over the child. 830 if (sibling == child) { 831 break; 832 } 833 834 // Ignore invisible views as they are not interactive. 835 if (!isVisible(sibling)) { 836 continue; 837 } 838 839 // Compute the sibling bounds in its coordinates. 840 RectF siblingBounds = mAttachInfo.mTmpTransformRect1; 841 siblingBounds.set(0, 0, sibling.getWidth(), sibling.getHeight()); 842 843 // Translate the sibling bounds to our coordinates. 844 offsetChildRectToMyCoords(siblingBounds, sibling); 845 846 // Compute the intersection between the child and the sibling. 847 if (siblingBounds.intersect(bounds)) { 848 List<RectF> clickableRects = new ArrayList<>(); 849 sibling.addClickableRectsForAccessibility(clickableRects); 850 851 final int clickableRectCount = clickableRects.size(); 852 for (int j = 0; j < clickableRectCount; j++) { 853 RectF clickableRect = clickableRects.get(j); 854 855 // Translate the clickable rect to our coordinates. 856 offsetChildRectToMyCoords(clickableRect, sibling); 857 858 // Compute the intersection between the child and the clickable rects. 859 if (clickableRect.intersect(bounds)) { 860 // If a clickable rect completely covers the child, done. 861 if (clickableRect.equals(bounds)) { 862 releaseOrderedChildIterator(); 863 return false; 864 } 865 // Keep track of the intersection rectangle. 866 intersections.add(clickableRect); 867 } 868 } 869 } 870 } 871 872 releaseOrderedChildIterator(); 873 874 if (mParent instanceof ViewGroup) { 875 ViewGroup parentGroup = (ViewGroup) mParent; 876 return parentGroup.translateBoundsAndIntersectionsInWindowCoordinates( 877 this, bounds, intersections); 878 } 879 880 return true; 881 } 882 883 @Override 884 void addClickableRectsForAccessibility(List<RectF> outRects) { 885 int sizeBefore = outRects.size(); 886 887 super.addClickableRectsForAccessibility(outRects); 888 889 // If we added ourselves, then no need to visit children. 890 if (outRects.size() > sizeBefore) { 891 return; 892 } 893 894 Iterator<View> iterator = obtainOrderedChildIterator(); 895 while (iterator.hasNext()) { 896 View child = iterator.next(); 897 898 // Cannot click on an invisible view. 899 if (!isVisible(child)) { 900 continue; 901 } 902 903 sizeBefore = outRects.size(); 904 905 // Add clickable rects in the child bounds. 906 child.addClickableRectsForAccessibility(outRects); 907 908 // Offset the clickable rects for out children to our coordinates. 909 final int sizeAfter = outRects.size(); 910 for (int j = sizeBefore; j < sizeAfter; j++) { 911 RectF rect = outRects.get(j); 912 913 // Translate the clickable rect to our coordinates. 914 offsetChildRectToMyCoords(rect, child); 915 916 // If a clickable rect fills the parent, done. 917 if ((int) rect.left == 0 && (int) rect.top == 0 918 && (int) rect.right == mRight && (int) rect.bottom == mBottom) { 919 releaseOrderedChildIterator(); 920 return; 921 } 922 } 923 } 924 925 releaseOrderedChildIterator(); 926 } 927 928 private void offsetChildRectToMyCoords(RectF rect, View child) { 929 if (!child.hasIdentityMatrix()) { 930 child.getMatrix().mapRect(rect); 931 } 932 final int childDx = child.mLeft - mScrollX; 933 final int childDy = child.mTop - mScrollY; 934 rect.offset(childDx, childDy); 935 } 936 937 private static boolean isVisible(View view) { 938 return (view.getAlpha() > 0 && view.getTransitionAlpha() > 0 && 939 view.getVisibility() == VISIBLE); 940 } 941 942 /** 943 * Obtains the iterator to traverse the children in a descending Z order. 944 * Only one party can use the iterator at any given time and you cannot 945 * modify the children while using this iterator. Acquisition if already 946 * obtained is an error. 947 * 948 * @return The child iterator. 949 */ 950 OrderedChildIterator obtainOrderedChildIterator() { 951 if (mOrderedChildIterator == null) { 952 mOrderedChildIterator = new OrderedChildIterator(); 953 } else if (mOrderedChildIterator.isInitialized()) { 954 throw new IllegalStateException("Already obtained"); 955 } 956 mOrderedChildIterator.initialize(); 957 return mOrderedChildIterator; 958 } 959 960 /** 961 * Releases the iterator to traverse the children in a descending Z order. 962 * Release if not obtained is an error. 963 */ 964 void releaseOrderedChildIterator() { 965 if (mOrderedChildIterator == null || !mOrderedChildIterator.isInitialized()) { 966 throw new IllegalStateException("Not obtained"); 967 } 968 mOrderedChildIterator.release(); 969 } 970 971 /** 972 * Called when a child view has changed whether or not it is tracking transient state. 973 */ 974 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 975 final boolean oldHasTransientState = hasTransientState(); 976 if (childHasTransientState) { 977 mChildCountWithTransientState++; 978 } else { 979 mChildCountWithTransientState--; 980 } 981 982 final boolean newHasTransientState = hasTransientState(); 983 if (mParent != null && oldHasTransientState != newHasTransientState) { 984 try { 985 mParent.childHasTransientStateChanged(this, newHasTransientState); 986 } catch (AbstractMethodError e) { 987 Log.e(TAG, mParent.getClass().getSimpleName() + 988 " does not fully implement ViewParent", e); 989 } 990 } 991 } 992 993 @Override 994 public boolean hasTransientState() { 995 return mChildCountWithTransientState > 0 || super.hasTransientState(); 996 } 997 998 /** 999 * {@inheritDoc} 1000 */ 1001 @Override 1002 public boolean dispatchUnhandledMove(View focused, int direction) { 1003 return mFocused != null && 1004 mFocused.dispatchUnhandledMove(focused, direction); 1005 } 1006 1007 /** 1008 * {@inheritDoc} 1009 */ 1010 public void clearChildFocus(View child) { 1011 if (DBG) { 1012 System.out.println(this + " clearChildFocus()"); 1013 } 1014 1015 mFocused = null; 1016 if (mParent != null) { 1017 mParent.clearChildFocus(this); 1018 } 1019 } 1020 1021 /** 1022 * {@inheritDoc} 1023 */ 1024 @Override 1025 public void clearFocus() { 1026 if (DBG) { 1027 System.out.println(this + " clearFocus()"); 1028 } 1029 if (mFocused == null) { 1030 super.clearFocus(); 1031 } else { 1032 View focused = mFocused; 1033 mFocused = null; 1034 focused.clearFocus(); 1035 } 1036 } 1037 1038 /** 1039 * {@inheritDoc} 1040 */ 1041 @Override 1042 void unFocus(View focused) { 1043 if (DBG) { 1044 System.out.println(this + " unFocus()"); 1045 } 1046 if (mFocused == null) { 1047 super.unFocus(focused); 1048 } else { 1049 mFocused.unFocus(focused); 1050 mFocused = null; 1051 } 1052 } 1053 1054 /** 1055 * Returns the focused child of this view, if any. The child may have focus 1056 * or contain focus. 1057 * 1058 * @return the focused child or null. 1059 */ 1060 public View getFocusedChild() { 1061 return mFocused; 1062 } 1063 1064 View getDeepestFocusedChild() { 1065 View v = this; 1066 while (v != null) { 1067 if (v.isFocused()) { 1068 return v; 1069 } 1070 v = v instanceof ViewGroup ? ((ViewGroup) v).getFocusedChild() : null; 1071 } 1072 return null; 1073 } 1074 1075 /** 1076 * Returns true if this view has or contains focus 1077 * 1078 * @return true if this view has or contains focus 1079 */ 1080 @Override 1081 public boolean hasFocus() { 1082 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 1083 } 1084 1085 /* 1086 * (non-Javadoc) 1087 * 1088 * @see android.view.View#findFocus() 1089 */ 1090 @Override 1091 public View findFocus() { 1092 if (DBG) { 1093 System.out.println("Find focus in " + this + ": flags=" 1094 + isFocused() + ", child=" + mFocused); 1095 } 1096 1097 if (isFocused()) { 1098 return this; 1099 } 1100 1101 if (mFocused != null) { 1102 return mFocused.findFocus(); 1103 } 1104 return null; 1105 } 1106 1107 /** 1108 * {@inheritDoc} 1109 */ 1110 @Override 1111 public boolean hasFocusable() { 1112 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 1113 return false; 1114 } 1115 1116 if (isFocusable()) { 1117 return true; 1118 } 1119 1120 final int descendantFocusability = getDescendantFocusability(); 1121 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 1122 final int count = mChildrenCount; 1123 final View[] children = mChildren; 1124 1125 for (int i = 0; i < count; i++) { 1126 final View child = children[i]; 1127 if (child.hasFocusable()) { 1128 return true; 1129 } 1130 } 1131 } 1132 1133 return false; 1134 } 1135 1136 /** 1137 * {@inheritDoc} 1138 */ 1139 @Override 1140 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 1141 final int focusableCount = views.size(); 1142 1143 final int descendantFocusability = getDescendantFocusability(); 1144 1145 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 1146 if (shouldBlockFocusForTouchscreen()) { 1147 focusableMode |= FOCUSABLES_TOUCH_MODE; 1148 } 1149 1150 final int count = mChildrenCount; 1151 final View[] children = mChildren; 1152 1153 for (int i = 0; i < count; i++) { 1154 final View child = children[i]; 1155 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1156 child.addFocusables(views, direction, focusableMode); 1157 } 1158 } 1159 } 1160 1161 // we add ourselves (if focusable) in all cases except for when we are 1162 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 1163 // to avoid the focus search finding layouts when a more precise search 1164 // among the focusable children would be more interesting. 1165 if ((descendantFocusability != FOCUS_AFTER_DESCENDANTS 1166 // No focusable descendants 1167 || (focusableCount == views.size())) && 1168 (isFocusableInTouchMode() || !shouldBlockFocusForTouchscreen())) { 1169 super.addFocusables(views, direction, focusableMode); 1170 } 1171 } 1172 1173 /** 1174 * Set whether this ViewGroup should ignore focus requests for itself and its children. 1175 * If this option is enabled and the ViewGroup or a descendant currently has focus, focus 1176 * will proceed forward. 1177 * 1178 * @param touchscreenBlocksFocus true to enable blocking focus in the presence of a touchscreen 1179 */ 1180 public void setTouchscreenBlocksFocus(boolean touchscreenBlocksFocus) { 1181 if (touchscreenBlocksFocus) { 1182 mGroupFlags |= FLAG_TOUCHSCREEN_BLOCKS_FOCUS; 1183 if (hasFocus()) { 1184 final View focusedChild = getDeepestFocusedChild(); 1185 if (!focusedChild.isFocusableInTouchMode()) { 1186 final View newFocus = focusSearch(FOCUS_FORWARD); 1187 if (newFocus != null) { 1188 newFocus.requestFocus(); 1189 } 1190 } 1191 } 1192 } else { 1193 mGroupFlags &= ~FLAG_TOUCHSCREEN_BLOCKS_FOCUS; 1194 } 1195 } 1196 1197 /** 1198 * Check whether this ViewGroup should ignore focus requests for itself and its children. 1199 */ 1200 public boolean getTouchscreenBlocksFocus() { 1201 return (mGroupFlags & FLAG_TOUCHSCREEN_BLOCKS_FOCUS) != 0; 1202 } 1203 1204 boolean shouldBlockFocusForTouchscreen() { 1205 return getTouchscreenBlocksFocus() && 1206 mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN); 1207 } 1208 1209 @Override 1210 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 1211 super.findViewsWithText(outViews, text, flags); 1212 final int childrenCount = mChildrenCount; 1213 final View[] children = mChildren; 1214 for (int i = 0; i < childrenCount; i++) { 1215 View child = children[i]; 1216 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1217 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 1218 child.findViewsWithText(outViews, text, flags); 1219 } 1220 } 1221 } 1222 1223 /** @hide */ 1224 @Override 1225 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 1226 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 1227 if (foundView != null) { 1228 return foundView; 1229 } 1230 final int childrenCount = mChildrenCount; 1231 final View[] children = mChildren; 1232 for (int i = 0; i < childrenCount; i++) { 1233 View child = children[i]; 1234 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 1235 if (foundView != null) { 1236 return foundView; 1237 } 1238 } 1239 return null; 1240 } 1241 1242 /** 1243 * {@inheritDoc} 1244 */ 1245 @Override 1246 public void dispatchWindowFocusChanged(boolean hasFocus) { 1247 super.dispatchWindowFocusChanged(hasFocus); 1248 final int count = mChildrenCount; 1249 final View[] children = mChildren; 1250 for (int i = 0; i < count; i++) { 1251 children[i].dispatchWindowFocusChanged(hasFocus); 1252 } 1253 } 1254 1255 /** 1256 * {@inheritDoc} 1257 */ 1258 @Override 1259 public void addTouchables(ArrayList<View> views) { 1260 super.addTouchables(views); 1261 1262 final int count = mChildrenCount; 1263 final View[] children = mChildren; 1264 1265 for (int i = 0; i < count; i++) { 1266 final View child = children[i]; 1267 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1268 child.addTouchables(views); 1269 } 1270 } 1271 } 1272 1273 /** 1274 * @hide 1275 */ 1276 @Override 1277 public void makeOptionalFitsSystemWindows() { 1278 super.makeOptionalFitsSystemWindows(); 1279 final int count = mChildrenCount; 1280 final View[] children = mChildren; 1281 for (int i = 0; i < count; i++) { 1282 children[i].makeOptionalFitsSystemWindows(); 1283 } 1284 } 1285 1286 /** 1287 * {@inheritDoc} 1288 */ 1289 @Override 1290 public void dispatchDisplayHint(int hint) { 1291 super.dispatchDisplayHint(hint); 1292 final int count = mChildrenCount; 1293 final View[] children = mChildren; 1294 for (int i = 0; i < count; i++) { 1295 children[i].dispatchDisplayHint(hint); 1296 } 1297 } 1298 1299 /** 1300 * Called when a view's visibility has changed. Notify the parent to take any appropriate 1301 * action. 1302 * 1303 * @param child The view whose visibility has changed 1304 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 1305 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 1306 * @hide 1307 */ 1308 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 1309 if (mTransition != null) { 1310 if (newVisibility == VISIBLE) { 1311 mTransition.showChild(this, child, oldVisibility); 1312 } else { 1313 mTransition.hideChild(this, child, newVisibility); 1314 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1315 // Only track this on disappearing views - appearing views are already visible 1316 // and don't need special handling during drawChild() 1317 if (mVisibilityChangingChildren == null) { 1318 mVisibilityChangingChildren = new ArrayList<View>(); 1319 } 1320 mVisibilityChangingChildren.add(child); 1321 addDisappearingView(child); 1322 } 1323 } 1324 } 1325 1326 // in all cases, for drags 1327 if (mCurrentDrag != null) { 1328 if (newVisibility == VISIBLE) { 1329 notifyChildOfDrag(child); 1330 } 1331 } 1332 } 1333 1334 /** 1335 * {@inheritDoc} 1336 */ 1337 @Override 1338 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1339 super.dispatchVisibilityChanged(changedView, visibility); 1340 final int count = mChildrenCount; 1341 final View[] children = mChildren; 1342 for (int i = 0; i < count; i++) { 1343 children[i].dispatchVisibilityChanged(changedView, visibility); 1344 } 1345 } 1346 1347 /** 1348 * {@inheritDoc} 1349 */ 1350 @Override 1351 public void dispatchWindowVisibilityChanged(int visibility) { 1352 super.dispatchWindowVisibilityChanged(visibility); 1353 final int count = mChildrenCount; 1354 final View[] children = mChildren; 1355 for (int i = 0; i < count; i++) { 1356 children[i].dispatchWindowVisibilityChanged(visibility); 1357 } 1358 } 1359 1360 /** 1361 * {@inheritDoc} 1362 */ 1363 @Override 1364 public void dispatchConfigurationChanged(Configuration newConfig) { 1365 super.dispatchConfigurationChanged(newConfig); 1366 final int count = mChildrenCount; 1367 final View[] children = mChildren; 1368 for (int i = 0; i < count; i++) { 1369 children[i].dispatchConfigurationChanged(newConfig); 1370 } 1371 } 1372 1373 /** 1374 * {@inheritDoc} 1375 */ 1376 public void recomputeViewAttributes(View child) { 1377 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1378 ViewParent parent = mParent; 1379 if (parent != null) parent.recomputeViewAttributes(this); 1380 } 1381 } 1382 1383 @Override 1384 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1385 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1386 super.dispatchCollectViewAttributes(attachInfo, visibility); 1387 final int count = mChildrenCount; 1388 final View[] children = mChildren; 1389 for (int i = 0; i < count; i++) { 1390 final View child = children[i]; 1391 child.dispatchCollectViewAttributes(attachInfo, 1392 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1393 } 1394 } 1395 } 1396 1397 /** 1398 * {@inheritDoc} 1399 */ 1400 public void bringChildToFront(View child) { 1401 int index = indexOfChild(child); 1402 if (index >= 0) { 1403 removeFromArray(index); 1404 addInArray(child, mChildrenCount); 1405 child.mParent = this; 1406 requestLayout(); 1407 invalidate(); 1408 } 1409 } 1410 1411 private PointF getLocalPoint() { 1412 if (mLocalPoint == null) mLocalPoint = new PointF(); 1413 return mLocalPoint; 1414 } 1415 1416 /** 1417 * {@inheritDoc} 1418 */ 1419 // TODO: Write real docs 1420 @Override 1421 public boolean dispatchDragEvent(DragEvent event) { 1422 boolean retval = false; 1423 final float tx = event.mX; 1424 final float ty = event.mY; 1425 1426 ViewRootImpl root = getViewRootImpl(); 1427 1428 // Dispatch down the view hierarchy 1429 final PointF localPoint = getLocalPoint(); 1430 1431 switch (event.mAction) { 1432 case DragEvent.ACTION_DRAG_STARTED: { 1433 // clear state to recalculate which views we drag over 1434 mCurrentDragView = null; 1435 1436 // Set up our tracking of drag-started notifications 1437 mCurrentDrag = DragEvent.obtain(event); 1438 if (mDragNotifiedChildren == null) { 1439 mDragNotifiedChildren = new HashSet<View>(); 1440 } else { 1441 mDragNotifiedChildren.clear(); 1442 } 1443 1444 // Now dispatch down to our children, caching the responses 1445 mChildAcceptsDrag = false; 1446 final int count = mChildrenCount; 1447 final View[] children = mChildren; 1448 for (int i = 0; i < count; i++) { 1449 final View child = children[i]; 1450 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1451 if (child.getVisibility() == VISIBLE) { 1452 final boolean handled = notifyChildOfDrag(children[i]); 1453 if (handled) { 1454 mChildAcceptsDrag = true; 1455 } 1456 } 1457 } 1458 1459 // Return HANDLED if one of our children can accept the drag 1460 if (mChildAcceptsDrag) { 1461 retval = true; 1462 } 1463 } break; 1464 1465 case DragEvent.ACTION_DRAG_ENDED: { 1466 // Release the bookkeeping now that the drag lifecycle has ended 1467 if (mDragNotifiedChildren != null) { 1468 for (View child : mDragNotifiedChildren) { 1469 // If a child was notified about an ongoing drag, it's told that it's over 1470 child.dispatchDragEvent(event); 1471 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1472 child.refreshDrawableState(); 1473 } 1474 1475 mDragNotifiedChildren.clear(); 1476 if (mCurrentDrag != null) { 1477 mCurrentDrag.recycle(); 1478 mCurrentDrag = null; 1479 } 1480 } 1481 1482 // We consider drag-ended to have been handled if one of our children 1483 // had offered to handle the drag. 1484 if (mChildAcceptsDrag) { 1485 retval = true; 1486 } 1487 } break; 1488 1489 case DragEvent.ACTION_DRAG_LOCATION: { 1490 // Find the [possibly new] drag target 1491 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1492 1493 // If we've changed apparent drag target, tell the view root which view 1494 // we're over now [for purposes of the eventual drag-recipient-changed 1495 // notifications to the framework] and tell the new target that the drag 1496 // has entered its bounds. The root will see setDragFocus() calls all 1497 // the way down to the final leaf view that is handling the LOCATION event 1498 // before reporting the new potential recipient to the framework. 1499 if (mCurrentDragView != target) { 1500 root.setDragFocus(target); 1501 1502 final int action = event.mAction; 1503 // If we've dragged off of a child view, send it the EXITED message 1504 if (mCurrentDragView != null) { 1505 final View view = mCurrentDragView; 1506 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1507 view.dispatchDragEvent(event); 1508 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1509 view.refreshDrawableState(); 1510 } 1511 mCurrentDragView = target; 1512 1513 // If we've dragged over a new child view, send it the ENTERED message 1514 if (target != null) { 1515 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1516 target.dispatchDragEvent(event); 1517 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1518 target.refreshDrawableState(); 1519 } 1520 event.mAction = action; // restore the event's original state 1521 } 1522 1523 // Dispatch the actual drag location notice, localized into its coordinates 1524 if (target != null) { 1525 event.mX = localPoint.x; 1526 event.mY = localPoint.y; 1527 1528 retval = target.dispatchDragEvent(event); 1529 1530 event.mX = tx; 1531 event.mY = ty; 1532 } 1533 } break; 1534 1535 /* Entered / exited dispatch 1536 * 1537 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1538 * that we're about to get the corresponding LOCATION event, which we will use to 1539 * determine which of our children is the new target; at that point we will 1540 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1541 * 1542 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1543 * drag has left this ViewGroup, we know by definition that every contained subview 1544 * is also no longer under the drag point. 1545 */ 1546 1547 case DragEvent.ACTION_DRAG_EXITED: { 1548 if (mCurrentDragView != null) { 1549 final View view = mCurrentDragView; 1550 view.dispatchDragEvent(event); 1551 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1552 view.refreshDrawableState(); 1553 1554 mCurrentDragView = null; 1555 } 1556 } break; 1557 1558 case DragEvent.ACTION_DROP: { 1559 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1560 View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1561 if (target != null) { 1562 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1563 event.mX = localPoint.x; 1564 event.mY = localPoint.y; 1565 retval = target.dispatchDragEvent(event); 1566 event.mX = tx; 1567 event.mY = ty; 1568 } else { 1569 if (ViewDebug.DEBUG_DRAG) { 1570 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1571 } 1572 } 1573 } break; 1574 } 1575 1576 // If none of our children could handle the event, try here 1577 if (!retval) { 1578 // Call up to the View implementation that dispatches to installed listeners 1579 retval = super.dispatchDragEvent(event); 1580 } 1581 return retval; 1582 } 1583 1584 // Find the frontmost child view that lies under the given point, and calculate 1585 // the position within its own local coordinate system. 1586 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1587 final int count = mChildrenCount; 1588 final View[] children = mChildren; 1589 for (int i = count - 1; i >= 0; i--) { 1590 final View child = children[i]; 1591 if (!child.canAcceptDrag()) { 1592 continue; 1593 } 1594 1595 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1596 return child; 1597 } 1598 } 1599 return null; 1600 } 1601 1602 boolean notifyChildOfDrag(View child) { 1603 if (ViewDebug.DEBUG_DRAG) { 1604 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1605 } 1606 1607 boolean canAccept = false; 1608 if (! mDragNotifiedChildren.contains(child)) { 1609 mDragNotifiedChildren.add(child); 1610 canAccept = child.dispatchDragEvent(mCurrentDrag); 1611 if (canAccept && !child.canAcceptDrag()) { 1612 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1613 child.refreshDrawableState(); 1614 } 1615 } 1616 return canAccept; 1617 } 1618 1619 @Override 1620 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1621 super.dispatchWindowSystemUiVisiblityChanged(visible); 1622 1623 final int count = mChildrenCount; 1624 final View[] children = mChildren; 1625 for (int i=0; i <count; i++) { 1626 final View child = children[i]; 1627 child.dispatchWindowSystemUiVisiblityChanged(visible); 1628 } 1629 } 1630 1631 @Override 1632 public void dispatchSystemUiVisibilityChanged(int visible) { 1633 super.dispatchSystemUiVisibilityChanged(visible); 1634 1635 final int count = mChildrenCount; 1636 final View[] children = mChildren; 1637 for (int i=0; i <count; i++) { 1638 final View child = children[i]; 1639 child.dispatchSystemUiVisibilityChanged(visible); 1640 } 1641 } 1642 1643 @Override 1644 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1645 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1646 1647 final int count = mChildrenCount; 1648 final View[] children = mChildren; 1649 for (int i=0; i <count; i++) { 1650 final View child = children[i]; 1651 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1652 } 1653 return changed; 1654 } 1655 1656 /** 1657 * {@inheritDoc} 1658 */ 1659 @Override 1660 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1661 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1662 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1663 return super.dispatchKeyEventPreIme(event); 1664 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1665 == PFLAG_HAS_BOUNDS) { 1666 return mFocused.dispatchKeyEventPreIme(event); 1667 } 1668 return false; 1669 } 1670 1671 /** 1672 * {@inheritDoc} 1673 */ 1674 @Override 1675 public boolean dispatchKeyEvent(KeyEvent event) { 1676 if (mInputEventConsistencyVerifier != null) { 1677 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1678 } 1679 1680 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1681 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1682 if (super.dispatchKeyEvent(event)) { 1683 return true; 1684 } 1685 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1686 == PFLAG_HAS_BOUNDS) { 1687 if (mFocused.dispatchKeyEvent(event)) { 1688 return true; 1689 } 1690 } 1691 1692 if (mInputEventConsistencyVerifier != null) { 1693 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1694 } 1695 return false; 1696 } 1697 1698 /** 1699 * {@inheritDoc} 1700 */ 1701 @Override 1702 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1703 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1704 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1705 return super.dispatchKeyShortcutEvent(event); 1706 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1707 == PFLAG_HAS_BOUNDS) { 1708 return mFocused.dispatchKeyShortcutEvent(event); 1709 } 1710 return false; 1711 } 1712 1713 /** 1714 * {@inheritDoc} 1715 */ 1716 @Override 1717 public boolean dispatchTrackballEvent(MotionEvent event) { 1718 if (mInputEventConsistencyVerifier != null) { 1719 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1720 } 1721 1722 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1723 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1724 if (super.dispatchTrackballEvent(event)) { 1725 return true; 1726 } 1727 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1728 == PFLAG_HAS_BOUNDS) { 1729 if (mFocused.dispatchTrackballEvent(event)) { 1730 return true; 1731 } 1732 } 1733 1734 if (mInputEventConsistencyVerifier != null) { 1735 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1736 } 1737 return false; 1738 } 1739 1740 /** 1741 * {@inheritDoc} 1742 */ 1743 @SuppressWarnings({"ConstantConditions"}) 1744 @Override 1745 protected boolean dispatchHoverEvent(MotionEvent event) { 1746 final int action = event.getAction(); 1747 1748 // First check whether the view group wants to intercept the hover event. 1749 final boolean interceptHover = onInterceptHoverEvent(event); 1750 event.setAction(action); // restore action in case it was changed 1751 1752 MotionEvent eventNoHistory = event; 1753 boolean handled = false; 1754 1755 // Send events to the hovered children and build a new list of hover targets until 1756 // one is found that handles the event. 1757 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1758 mFirstHoverTarget = null; 1759 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1760 final float x = event.getX(); 1761 final float y = event.getY(); 1762 final int childrenCount = mChildrenCount; 1763 if (childrenCount != 0) { 1764 final ArrayList<View> preorderedList = buildOrderedChildList(); 1765 final boolean customOrder = preorderedList == null 1766 && isChildrenDrawingOrderEnabled(); 1767 final View[] children = mChildren; 1768 HoverTarget lastHoverTarget = null; 1769 for (int i = childrenCount - 1; i >= 0; i--) { 1770 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1771 final View child = (preorderedList == null) 1772 ? children[childIndex] : preorderedList.get(childIndex); 1773 if (!canViewReceivePointerEvents(child) 1774 || !isTransformedTouchPointInView(x, y, child, null)) { 1775 continue; 1776 } 1777 1778 // Obtain a hover target for this child. Dequeue it from the 1779 // old hover target list if the child was previously hovered. 1780 HoverTarget hoverTarget = firstOldHoverTarget; 1781 final boolean wasHovered; 1782 for (HoverTarget predecessor = null; ;) { 1783 if (hoverTarget == null) { 1784 hoverTarget = HoverTarget.obtain(child); 1785 wasHovered = false; 1786 break; 1787 } 1788 1789 if (hoverTarget.child == child) { 1790 if (predecessor != null) { 1791 predecessor.next = hoverTarget.next; 1792 } else { 1793 firstOldHoverTarget = hoverTarget.next; 1794 } 1795 hoverTarget.next = null; 1796 wasHovered = true; 1797 break; 1798 } 1799 1800 predecessor = hoverTarget; 1801 hoverTarget = hoverTarget.next; 1802 } 1803 1804 // Enqueue the hover target onto the new hover target list. 1805 if (lastHoverTarget != null) { 1806 lastHoverTarget.next = hoverTarget; 1807 } else { 1808 mFirstHoverTarget = hoverTarget; 1809 } 1810 lastHoverTarget = hoverTarget; 1811 1812 // Dispatch the event to the child. 1813 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1814 if (!wasHovered) { 1815 // Send the enter as is. 1816 handled |= dispatchTransformedGenericPointerEvent( 1817 event, child); // enter 1818 } 1819 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1820 if (!wasHovered) { 1821 // Synthesize an enter from a move. 1822 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1823 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1824 handled |= dispatchTransformedGenericPointerEvent( 1825 eventNoHistory, child); // enter 1826 eventNoHistory.setAction(action); 1827 1828 handled |= dispatchTransformedGenericPointerEvent( 1829 eventNoHistory, child); // move 1830 } else { 1831 // Send the move as is. 1832 handled |= dispatchTransformedGenericPointerEvent(event, child); 1833 } 1834 } 1835 if (handled) { 1836 break; 1837 } 1838 } 1839 if (preorderedList != null) preorderedList.clear(); 1840 } 1841 } 1842 1843 // Send exit events to all previously hovered children that are no longer hovered. 1844 while (firstOldHoverTarget != null) { 1845 final View child = firstOldHoverTarget.child; 1846 1847 // Exit the old hovered child. 1848 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1849 // Send the exit as is. 1850 handled |= dispatchTransformedGenericPointerEvent( 1851 event, child); // exit 1852 } else { 1853 // Synthesize an exit from a move or enter. 1854 // Ignore the result because hover focus has moved to a different view. 1855 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1856 dispatchTransformedGenericPointerEvent( 1857 event, child); // move 1858 } 1859 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1860 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1861 dispatchTransformedGenericPointerEvent( 1862 eventNoHistory, child); // exit 1863 eventNoHistory.setAction(action); 1864 } 1865 1866 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1867 firstOldHoverTarget.recycle(); 1868 firstOldHoverTarget = nextOldHoverTarget; 1869 } 1870 1871 // Send events to the view group itself if no children have handled it. 1872 boolean newHoveredSelf = !handled; 1873 if (newHoveredSelf == mHoveredSelf) { 1874 if (newHoveredSelf) { 1875 // Send event to the view group as before. 1876 handled |= super.dispatchHoverEvent(event); 1877 } 1878 } else { 1879 if (mHoveredSelf) { 1880 // Exit the view group. 1881 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1882 // Send the exit as is. 1883 handled |= super.dispatchHoverEvent(event); // exit 1884 } else { 1885 // Synthesize an exit from a move or enter. 1886 // Ignore the result because hover focus is moving to a different view. 1887 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1888 super.dispatchHoverEvent(event); // move 1889 } 1890 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1891 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1892 super.dispatchHoverEvent(eventNoHistory); // exit 1893 eventNoHistory.setAction(action); 1894 } 1895 mHoveredSelf = false; 1896 } 1897 1898 if (newHoveredSelf) { 1899 // Enter the view group. 1900 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1901 // Send the enter as is. 1902 handled |= super.dispatchHoverEvent(event); // enter 1903 mHoveredSelf = true; 1904 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1905 // Synthesize an enter from a move. 1906 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1907 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1908 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1909 eventNoHistory.setAction(action); 1910 1911 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1912 mHoveredSelf = true; 1913 } 1914 } 1915 } 1916 1917 // Recycle the copy of the event that we made. 1918 if (eventNoHistory != event) { 1919 eventNoHistory.recycle(); 1920 } 1921 1922 // Done. 1923 return handled; 1924 } 1925 1926 private void exitHoverTargets() { 1927 if (mHoveredSelf || mFirstHoverTarget != null) { 1928 final long now = SystemClock.uptimeMillis(); 1929 MotionEvent event = MotionEvent.obtain(now, now, 1930 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1931 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1932 dispatchHoverEvent(event); 1933 event.recycle(); 1934 } 1935 } 1936 1937 private void cancelHoverTarget(View view) { 1938 HoverTarget predecessor = null; 1939 HoverTarget target = mFirstHoverTarget; 1940 while (target != null) { 1941 final HoverTarget next = target.next; 1942 if (target.child == view) { 1943 if (predecessor == null) { 1944 mFirstHoverTarget = next; 1945 } else { 1946 predecessor.next = next; 1947 } 1948 target.recycle(); 1949 1950 final long now = SystemClock.uptimeMillis(); 1951 MotionEvent event = MotionEvent.obtain(now, now, 1952 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1953 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1954 view.dispatchHoverEvent(event); 1955 event.recycle(); 1956 return; 1957 } 1958 predecessor = target; 1959 target = next; 1960 } 1961 } 1962 1963 /** @hide */ 1964 @Override 1965 protected boolean hasHoveredChild() { 1966 return mFirstHoverTarget != null; 1967 } 1968 1969 @Override 1970 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1971 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1972 try { 1973 final int childrenCount = children.getChildCount(); 1974 for (int i = 0; i < childrenCount; i++) { 1975 View child = children.getChildAt(i); 1976 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1977 if (child.includeForAccessibility()) { 1978 childrenForAccessibility.add(child); 1979 } else { 1980 child.addChildrenForAccessibility(childrenForAccessibility); 1981 } 1982 } 1983 } 1984 } finally { 1985 children.recycle(); 1986 } 1987 } 1988 1989 /** 1990 * Implement this method to intercept hover events before they are handled 1991 * by child views. 1992 * <p> 1993 * This method is called before dispatching a hover event to a child of 1994 * the view group or to the view group's own {@link #onHoverEvent} to allow 1995 * the view group a chance to intercept the hover event. 1996 * This method can also be used to watch all pointer motions that occur within 1997 * the bounds of the view group even when the pointer is hovering over 1998 * a child of the view group rather than over the view group itself. 1999 * </p><p> 2000 * The view group can prevent its children from receiving hover events by 2001 * implementing this method and returning <code>true</code> to indicate 2002 * that it would like to intercept hover events. The view group must 2003 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 2004 * for as long as it wishes to continue intercepting hover events from 2005 * its children. 2006 * </p><p> 2007 * Interception preserves the invariant that at most one view can be 2008 * hovered at a time by transferring hover focus from the currently hovered 2009 * child to the view group or vice-versa as needed. 2010 * </p><p> 2011 * If this method returns <code>true</code> and a child is already hovered, then the 2012 * child view will first receive a hover exit event and then the view group 2013 * itself will receive a hover enter event in {@link #onHoverEvent}. 2014 * Likewise, if this method had previously returned <code>true</code> to intercept hover 2015 * events and instead returns <code>false</code> while the pointer is hovering 2016 * within the bounds of one of a child, then the view group will first receive a 2017 * hover exit event in {@link #onHoverEvent} and then the hovered child will 2018 * receive a hover enter event. 2019 * </p><p> 2020 * The default implementation always returns false. 2021 * </p> 2022 * 2023 * @param event The motion event that describes the hover. 2024 * @return True if the view group would like to intercept the hover event 2025 * and prevent its children from receiving it. 2026 */ 2027 public boolean onInterceptHoverEvent(MotionEvent event) { 2028 return false; 2029 } 2030 2031 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 2032 if (event.getHistorySize() == 0) { 2033 return event; 2034 } 2035 return MotionEvent.obtainNoHistory(event); 2036 } 2037 2038 /** 2039 * {@inheritDoc} 2040 */ 2041 @Override 2042 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 2043 // Send the event to the child under the pointer. 2044 final int childrenCount = mChildrenCount; 2045 if (childrenCount != 0) { 2046 final float x = event.getX(); 2047 final float y = event.getY(); 2048 2049 final ArrayList<View> preorderedList = buildOrderedChildList(); 2050 final boolean customOrder = preorderedList == null 2051 && isChildrenDrawingOrderEnabled(); 2052 final View[] children = mChildren; 2053 for (int i = childrenCount - 1; i >= 0; i--) { 2054 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 2055 final View child = (preorderedList == null) 2056 ? children[childIndex] : preorderedList.get(childIndex); 2057 if (!canViewReceivePointerEvents(child) 2058 || !isTransformedTouchPointInView(x, y, child, null)) { 2059 continue; 2060 } 2061 2062 if (dispatchTransformedGenericPointerEvent(event, child)) { 2063 if (preorderedList != null) preorderedList.clear(); 2064 return true; 2065 } 2066 } 2067 if (preorderedList != null) preorderedList.clear(); 2068 } 2069 2070 // No child handled the event. Send it to this view group. 2071 return super.dispatchGenericPointerEvent(event); 2072 } 2073 2074 /** 2075 * {@inheritDoc} 2076 */ 2077 @Override 2078 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 2079 // Send the event to the focused child or to this view group if it has focus. 2080 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 2081 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 2082 return super.dispatchGenericFocusedEvent(event); 2083 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 2084 == PFLAG_HAS_BOUNDS) { 2085 return mFocused.dispatchGenericMotionEvent(event); 2086 } 2087 return false; 2088 } 2089 2090 /** 2091 * Dispatches a generic pointer event to a child, taking into account 2092 * transformations that apply to the child. 2093 * 2094 * @param event The event to send. 2095 * @param child The view to send the event to. 2096 * @return {@code true} if the child handled the event. 2097 */ 2098 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 2099 final float offsetX = mScrollX - child.mLeft; 2100 final float offsetY = mScrollY - child.mTop; 2101 2102 boolean handled; 2103 if (!child.hasIdentityMatrix()) { 2104 MotionEvent transformedEvent = MotionEvent.obtain(event); 2105 transformedEvent.offsetLocation(offsetX, offsetY); 2106 transformedEvent.transform(child.getInverseMatrix()); 2107 handled = child.dispatchGenericMotionEvent(transformedEvent); 2108 transformedEvent.recycle(); 2109 } else { 2110 event.offsetLocation(offsetX, offsetY); 2111 handled = child.dispatchGenericMotionEvent(event); 2112 event.offsetLocation(-offsetX, -offsetY); 2113 } 2114 return handled; 2115 } 2116 2117 /** 2118 * {@inheritDoc} 2119 */ 2120 @Override 2121 public boolean dispatchTouchEvent(MotionEvent ev) { 2122 if (mInputEventConsistencyVerifier != null) { 2123 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 2124 } 2125 2126 boolean handled = false; 2127 if (onFilterTouchEventForSecurity(ev)) { 2128 final int action = ev.getAction(); 2129 final int actionMasked = action & MotionEvent.ACTION_MASK; 2130 2131 // Handle an initial down. 2132 if (actionMasked == MotionEvent.ACTION_DOWN) { 2133 // Throw away all previous state when starting a new touch gesture. 2134 // The framework may have dropped the up or cancel event for the previous gesture 2135 // due to an app switch, ANR, or some other state change. 2136 cancelAndClearTouchTargets(ev); 2137 resetTouchState(); 2138 } 2139 2140 // Check for interception. 2141 final boolean intercepted; 2142 if (actionMasked == MotionEvent.ACTION_DOWN 2143 || mFirstTouchTarget != null) { 2144 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 2145 if (!disallowIntercept) { 2146 intercepted = onInterceptTouchEvent(ev); 2147 ev.setAction(action); // restore action in case it was changed 2148 } else { 2149 intercepted = false; 2150 } 2151 } else { 2152 // There are no touch targets and this action is not an initial down 2153 // so this view group continues to intercept touches. 2154 intercepted = true; 2155 } 2156 2157 // Check for cancelation. 2158 final boolean canceled = resetCancelNextUpFlag(this) 2159 || actionMasked == MotionEvent.ACTION_CANCEL; 2160 2161 // Update list of touch targets for pointer down, if needed. 2162 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 2163 TouchTarget newTouchTarget = null; 2164 boolean alreadyDispatchedToNewTouchTarget = false; 2165 if (!canceled && !intercepted) { 2166 if (actionMasked == MotionEvent.ACTION_DOWN 2167 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 2168 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 2169 final int actionIndex = ev.getActionIndex(); // always 0 for down 2170 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 2171 : TouchTarget.ALL_POINTER_IDS; 2172 2173 // Clean up earlier touch targets for this pointer id in case they 2174 // have become out of sync. 2175 removePointersFromTouchTargets(idBitsToAssign); 2176 2177 final int childrenCount = mChildrenCount; 2178 if (newTouchTarget == null && childrenCount != 0) { 2179 final float x = ev.getX(actionIndex); 2180 final float y = ev.getY(actionIndex); 2181 // Find a child that can receive the event. 2182 // Scan children from front to back. 2183 final ArrayList<View> preorderedList = buildOrderedChildList(); 2184 final boolean customOrder = preorderedList == null 2185 && isChildrenDrawingOrderEnabled(); 2186 final View[] children = mChildren; 2187 for (int i = childrenCount - 1; i >= 0; i--) { 2188 final int childIndex = customOrder 2189 ? getChildDrawingOrder(childrenCount, i) : i; 2190 final View child = (preorderedList == null) 2191 ? children[childIndex] : preorderedList.get(childIndex); 2192 if (!canViewReceivePointerEvents(child) 2193 || !isTransformedTouchPointInView(x, y, child, null)) { 2194 continue; 2195 } 2196 2197 newTouchTarget = getTouchTarget(child); 2198 if (newTouchTarget != null) { 2199 // Child is already receiving touch within its bounds. 2200 // Give it the new pointer in addition to the ones it is handling. 2201 newTouchTarget.pointerIdBits |= idBitsToAssign; 2202 break; 2203 } 2204 2205 resetCancelNextUpFlag(child); 2206 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 2207 // Child wants to receive touch within its bounds. 2208 mLastTouchDownTime = ev.getDownTime(); 2209 if (preorderedList != null) { 2210 // childIndex points into presorted list, find original index 2211 for (int j = 0; j < childrenCount; j++) { 2212 if (children[childIndex] == mChildren[j]) { 2213 mLastTouchDownIndex = j; 2214 break; 2215 } 2216 } 2217 } else { 2218 mLastTouchDownIndex = childIndex; 2219 } 2220 mLastTouchDownX = ev.getX(); 2221 mLastTouchDownY = ev.getY(); 2222 newTouchTarget = addTouchTarget(child, idBitsToAssign); 2223 alreadyDispatchedToNewTouchTarget = true; 2224 break; 2225 } 2226 } 2227 if (preorderedList != null) preorderedList.clear(); 2228 } 2229 2230 if (newTouchTarget == null && mFirstTouchTarget != null) { 2231 // Did not find a child to receive the event. 2232 // Assign the pointer to the least recently added target. 2233 newTouchTarget = mFirstTouchTarget; 2234 while (newTouchTarget.next != null) { 2235 newTouchTarget = newTouchTarget.next; 2236 } 2237 newTouchTarget.pointerIdBits |= idBitsToAssign; 2238 } 2239 } 2240 } 2241 2242 // Dispatch to touch targets. 2243 if (mFirstTouchTarget == null) { 2244 // No touch targets so treat this as an ordinary view. 2245 handled = dispatchTransformedTouchEvent(ev, canceled, null, 2246 TouchTarget.ALL_POINTER_IDS); 2247 } else { 2248 // Dispatch to touch targets, excluding the new touch target if we already 2249 // dispatched to it. Cancel touch targets if necessary. 2250 TouchTarget predecessor = null; 2251 TouchTarget target = mFirstTouchTarget; 2252 while (target != null) { 2253 final TouchTarget next = target.next; 2254 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 2255 handled = true; 2256 } else { 2257 final boolean cancelChild = resetCancelNextUpFlag(target.child) 2258 || intercepted; 2259 if (dispatchTransformedTouchEvent(ev, cancelChild, 2260 target.child, target.pointerIdBits)) { 2261 handled = true; 2262 } 2263 if (cancelChild) { 2264 if (predecessor == null) { 2265 mFirstTouchTarget = next; 2266 } else { 2267 predecessor.next = next; 2268 } 2269 target.recycle(); 2270 target = next; 2271 continue; 2272 } 2273 } 2274 predecessor = target; 2275 target = next; 2276 } 2277 } 2278 2279 // Update list of touch targets for pointer up or cancel, if needed. 2280 if (canceled 2281 || actionMasked == MotionEvent.ACTION_UP 2282 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 2283 resetTouchState(); 2284 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 2285 final int actionIndex = ev.getActionIndex(); 2286 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 2287 removePointersFromTouchTargets(idBitsToRemove); 2288 } 2289 } 2290 2291 if (!handled && mInputEventConsistencyVerifier != null) { 2292 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 2293 } 2294 return handled; 2295 } 2296 2297 /** 2298 * Resets all touch state in preparation for a new cycle. 2299 */ 2300 private void resetTouchState() { 2301 clearTouchTargets(); 2302 resetCancelNextUpFlag(this); 2303 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2304 mNestedScrollAxes = SCROLL_AXIS_NONE; 2305 } 2306 2307 /** 2308 * Resets the cancel next up flag. 2309 * Returns true if the flag was previously set. 2310 */ 2311 private static boolean resetCancelNextUpFlag(View view) { 2312 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 2313 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 2314 return true; 2315 } 2316 return false; 2317 } 2318 2319 /** 2320 * Clears all touch targets. 2321 */ 2322 private void clearTouchTargets() { 2323 TouchTarget target = mFirstTouchTarget; 2324 if (target != null) { 2325 do { 2326 TouchTarget next = target.next; 2327 target.recycle(); 2328 target = next; 2329 } while (target != null); 2330 mFirstTouchTarget = null; 2331 } 2332 } 2333 2334 /** 2335 * Cancels and clears all touch targets. 2336 */ 2337 private void cancelAndClearTouchTargets(MotionEvent event) { 2338 if (mFirstTouchTarget != null) { 2339 boolean syntheticEvent = false; 2340 if (event == null) { 2341 final long now = SystemClock.uptimeMillis(); 2342 event = MotionEvent.obtain(now, now, 2343 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2344 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2345 syntheticEvent = true; 2346 } 2347 2348 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2349 resetCancelNextUpFlag(target.child); 2350 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2351 } 2352 clearTouchTargets(); 2353 2354 if (syntheticEvent) { 2355 event.recycle(); 2356 } 2357 } 2358 } 2359 2360 /** 2361 * Gets the touch target for specified child view. 2362 * Returns null if not found. 2363 */ 2364 private TouchTarget getTouchTarget(View child) { 2365 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2366 if (target.child == child) { 2367 return target; 2368 } 2369 } 2370 return null; 2371 } 2372 2373 /** 2374 * Adds a touch target for specified child to the beginning of the list. 2375 * Assumes the target child is not already present. 2376 */ 2377 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2378 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2379 target.next = mFirstTouchTarget; 2380 mFirstTouchTarget = target; 2381 return target; 2382 } 2383 2384 /** 2385 * Removes the pointer ids from consideration. 2386 */ 2387 private void removePointersFromTouchTargets(int pointerIdBits) { 2388 TouchTarget predecessor = null; 2389 TouchTarget target = mFirstTouchTarget; 2390 while (target != null) { 2391 final TouchTarget next = target.next; 2392 if ((target.pointerIdBits & pointerIdBits) != 0) { 2393 target.pointerIdBits &= ~pointerIdBits; 2394 if (target.pointerIdBits == 0) { 2395 if (predecessor == null) { 2396 mFirstTouchTarget = next; 2397 } else { 2398 predecessor.next = next; 2399 } 2400 target.recycle(); 2401 target = next; 2402 continue; 2403 } 2404 } 2405 predecessor = target; 2406 target = next; 2407 } 2408 } 2409 2410 private void cancelTouchTarget(View view) { 2411 TouchTarget predecessor = null; 2412 TouchTarget target = mFirstTouchTarget; 2413 while (target != null) { 2414 final TouchTarget next = target.next; 2415 if (target.child == view) { 2416 if (predecessor == null) { 2417 mFirstTouchTarget = next; 2418 } else { 2419 predecessor.next = next; 2420 } 2421 target.recycle(); 2422 2423 final long now = SystemClock.uptimeMillis(); 2424 MotionEvent event = MotionEvent.obtain(now, now, 2425 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2426 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2427 view.dispatchTouchEvent(event); 2428 event.recycle(); 2429 return; 2430 } 2431 predecessor = target; 2432 target = next; 2433 } 2434 } 2435 2436 /** 2437 * Returns true if a child view can receive pointer events. 2438 * @hide 2439 */ 2440 private static boolean canViewReceivePointerEvents(View child) { 2441 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2442 || child.getAnimation() != null; 2443 } 2444 2445 /** 2446 * Returns true if a child view contains the specified point when transformed 2447 * into its coordinate space. 2448 * Child must not be null. 2449 * @hide 2450 */ 2451 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2452 PointF outLocalPoint) { 2453 float localX = x + mScrollX - child.mLeft; 2454 float localY = y + mScrollY - child.mTop; 2455 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2456 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2457 localXY[0] = localX; 2458 localXY[1] = localY; 2459 child.getInverseMatrix().mapPoints(localXY); 2460 localX = localXY[0]; 2461 localY = localXY[1]; 2462 } 2463 final boolean isInView = child.pointInView(localX, localY); 2464 if (isInView && outLocalPoint != null) { 2465 outLocalPoint.set(localX, localY); 2466 } 2467 return isInView; 2468 } 2469 2470 /** 2471 * Transforms a motion event into the coordinate space of a particular child view, 2472 * filters out irrelevant pointer ids, and overrides its action if necessary. 2473 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2474 */ 2475 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2476 View child, int desiredPointerIdBits) { 2477 final boolean handled; 2478 2479 // Canceling motions is a special case. We don't need to perform any transformations 2480 // or filtering. The important part is the action, not the contents. 2481 final int oldAction = event.getAction(); 2482 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2483 event.setAction(MotionEvent.ACTION_CANCEL); 2484 if (child == null) { 2485 handled = super.dispatchTouchEvent(event); 2486 } else { 2487 handled = child.dispatchTouchEvent(event); 2488 } 2489 event.setAction(oldAction); 2490 return handled; 2491 } 2492 2493 // Calculate the number of pointers to deliver. 2494 final int oldPointerIdBits = event.getPointerIdBits(); 2495 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2496 2497 // If for some reason we ended up in an inconsistent state where it looks like we 2498 // might produce a motion event with no pointers in it, then drop the event. 2499 if (newPointerIdBits == 0) { 2500 return false; 2501 } 2502 2503 // If the number of pointers is the same and we don't need to perform any fancy 2504 // irreversible transformations, then we can reuse the motion event for this 2505 // dispatch as long as we are careful to revert any changes we make. 2506 // Otherwise we need to make a copy. 2507 final MotionEvent transformedEvent; 2508 if (newPointerIdBits == oldPointerIdBits) { 2509 if (child == null || child.hasIdentityMatrix()) { 2510 if (child == null) { 2511 handled = super.dispatchTouchEvent(event); 2512 } else { 2513 final float offsetX = mScrollX - child.mLeft; 2514 final float offsetY = mScrollY - child.mTop; 2515 event.offsetLocation(offsetX, offsetY); 2516 2517 handled = child.dispatchTouchEvent(event); 2518 2519 event.offsetLocation(-offsetX, -offsetY); 2520 } 2521 return handled; 2522 } 2523 transformedEvent = MotionEvent.obtain(event); 2524 } else { 2525 transformedEvent = event.split(newPointerIdBits); 2526 } 2527 2528 // Perform any necessary transformations and dispatch. 2529 if (child == null) { 2530 handled = super.dispatchTouchEvent(transformedEvent); 2531 } else { 2532 final float offsetX = mScrollX - child.mLeft; 2533 final float offsetY = mScrollY - child.mTop; 2534 transformedEvent.offsetLocation(offsetX, offsetY); 2535 if (! child.hasIdentityMatrix()) { 2536 transformedEvent.transform(child.getInverseMatrix()); 2537 } 2538 2539 handled = child.dispatchTouchEvent(transformedEvent); 2540 } 2541 2542 // Done. 2543 transformedEvent.recycle(); 2544 return handled; 2545 } 2546 2547 /** 2548 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2549 * dispatch. This behavior is enabled by default for applications that target an 2550 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2551 * 2552 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2553 * views depending on where each pointer initially went down. This allows for user interactions 2554 * such as scrolling two panes of content independently, chording of buttons, and performing 2555 * independent gestures on different pieces of content. 2556 * 2557 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2558 * child views. <code>false</code> to only allow one child view to be the target of 2559 * any MotionEvent received by this ViewGroup. 2560 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 2561 */ 2562 public void setMotionEventSplittingEnabled(boolean split) { 2563 // TODO Applications really shouldn't change this setting mid-touch event, 2564 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2565 // with gestures in progress when this is changed. 2566 if (split) { 2567 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2568 } else { 2569 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2570 } 2571 } 2572 2573 /** 2574 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2575 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2576 */ 2577 public boolean isMotionEventSplittingEnabled() { 2578 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2579 } 2580 2581 /** 2582 * Returns true if this ViewGroup should be considered as a single entity for removal 2583 * when executing an Activity transition. If this is false, child elements will move 2584 * individually during the transition. 2585 * 2586 * @return True if the ViewGroup should be acted on together during an Activity transition. 2587 * The default value is true when there is a non-null background or if 2588 * {@link #getTransitionName()} is not null or if a 2589 * non-null {@link android.view.ViewOutlineProvider} other than 2590 * {@link android.view.ViewOutlineProvider#BACKGROUND} was given to 2591 * {@link #setOutlineProvider(ViewOutlineProvider)} and false otherwise. 2592 */ 2593 public boolean isTransitionGroup() { 2594 if ((mGroupFlags & FLAG_IS_TRANSITION_GROUP_SET) != 0) { 2595 return ((mGroupFlags & FLAG_IS_TRANSITION_GROUP) != 0); 2596 } else { 2597 final ViewOutlineProvider outlineProvider = getOutlineProvider(); 2598 return getBackground() != null || getTransitionName() != null || 2599 (outlineProvider != null && outlineProvider != ViewOutlineProvider.BACKGROUND); 2600 } 2601 } 2602 2603 /** 2604 * Changes whether or not this ViewGroup should be treated as a single entity during 2605 * Activity Transitions. 2606 * @param isTransitionGroup Whether or not the ViewGroup should be treated as a unit 2607 * in Activity transitions. If false, the ViewGroup won't transition, 2608 * only its children. If true, the entire ViewGroup will transition 2609 * together. 2610 * @see android.app.ActivityOptions#makeSceneTransitionAnimation(android.app.Activity, 2611 * android.util.Pair[]) 2612 */ 2613 public void setTransitionGroup(boolean isTransitionGroup) { 2614 mGroupFlags |= FLAG_IS_TRANSITION_GROUP_SET; 2615 if (isTransitionGroup) { 2616 mGroupFlags |= FLAG_IS_TRANSITION_GROUP; 2617 } else { 2618 mGroupFlags &= ~FLAG_IS_TRANSITION_GROUP; 2619 } 2620 } 2621 2622 /** 2623 * {@inheritDoc} 2624 */ 2625 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2626 2627 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2628 // We're already in this state, assume our ancestors are too 2629 return; 2630 } 2631 2632 if (disallowIntercept) { 2633 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2634 } else { 2635 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2636 } 2637 2638 // Pass it up to our parent 2639 if (mParent != null) { 2640 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2641 } 2642 } 2643 2644 /** 2645 * Implement this method to intercept all touch screen motion events. This 2646 * allows you to watch events as they are dispatched to your children, and 2647 * take ownership of the current gesture at any point. 2648 * 2649 * <p>Using this function takes some care, as it has a fairly complicated 2650 * interaction with {@link View#onTouchEvent(MotionEvent) 2651 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2652 * that method as well as this one in the correct way. Events will be 2653 * received in the following order: 2654 * 2655 * <ol> 2656 * <li> You will receive the down event here. 2657 * <li> The down event will be handled either by a child of this view 2658 * group, or given to your own onTouchEvent() method to handle; this means 2659 * you should implement onTouchEvent() to return true, so you will 2660 * continue to see the rest of the gesture (instead of looking for 2661 * a parent view to handle it). Also, by returning true from 2662 * onTouchEvent(), you will not receive any following 2663 * events in onInterceptTouchEvent() and all touch processing must 2664 * happen in onTouchEvent() like normal. 2665 * <li> For as long as you return false from this function, each following 2666 * event (up to and including the final up) will be delivered first here 2667 * and then to the target's onTouchEvent(). 2668 * <li> If you return true from here, you will not receive any 2669 * following events: the target view will receive the same event but 2670 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2671 * events will be delivered to your onTouchEvent() method and no longer 2672 * appear here. 2673 * </ol> 2674 * 2675 * @param ev The motion event being dispatched down the hierarchy. 2676 * @return Return true to steal motion events from the children and have 2677 * them dispatched to this ViewGroup through onTouchEvent(). 2678 * The current target will receive an ACTION_CANCEL event, and no further 2679 * messages will be delivered here. 2680 */ 2681 public boolean onInterceptTouchEvent(MotionEvent ev) { 2682 return false; 2683 } 2684 2685 /** 2686 * {@inheritDoc} 2687 * 2688 * Looks for a view to give focus to respecting the setting specified by 2689 * {@link #getDescendantFocusability()}. 2690 * 2691 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2692 * find focus within the children of this group when appropriate. 2693 * 2694 * @see #FOCUS_BEFORE_DESCENDANTS 2695 * @see #FOCUS_AFTER_DESCENDANTS 2696 * @see #FOCUS_BLOCK_DESCENDANTS 2697 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2698 */ 2699 @Override 2700 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2701 if (DBG) { 2702 System.out.println(this + " ViewGroup.requestFocus direction=" 2703 + direction); 2704 } 2705 int descendantFocusability = getDescendantFocusability(); 2706 2707 switch (descendantFocusability) { 2708 case FOCUS_BLOCK_DESCENDANTS: 2709 return super.requestFocus(direction, previouslyFocusedRect); 2710 case FOCUS_BEFORE_DESCENDANTS: { 2711 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2712 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2713 } 2714 case FOCUS_AFTER_DESCENDANTS: { 2715 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2716 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2717 } 2718 default: 2719 throw new IllegalStateException("descendant focusability must be " 2720 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2721 + "but is " + descendantFocusability); 2722 } 2723 } 2724 2725 /** 2726 * Look for a descendant to call {@link View#requestFocus} on. 2727 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2728 * when it wants to request focus within its children. Override this to 2729 * customize how your {@link ViewGroup} requests focus within its children. 2730 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2731 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2732 * to give a finer grained hint about where focus is coming from. May be null 2733 * if there is no hint. 2734 * @return Whether focus was taken. 2735 */ 2736 @SuppressWarnings({"ConstantConditions"}) 2737 protected boolean onRequestFocusInDescendants(int direction, 2738 Rect previouslyFocusedRect) { 2739 int index; 2740 int increment; 2741 int end; 2742 int count = mChildrenCount; 2743 if ((direction & FOCUS_FORWARD) != 0) { 2744 index = 0; 2745 increment = 1; 2746 end = count; 2747 } else { 2748 index = count - 1; 2749 increment = -1; 2750 end = -1; 2751 } 2752 final View[] children = mChildren; 2753 for (int i = index; i != end; i += increment) { 2754 View child = children[i]; 2755 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2756 if (child.requestFocus(direction, previouslyFocusedRect)) { 2757 return true; 2758 } 2759 } 2760 } 2761 return false; 2762 } 2763 2764 /** 2765 * {@inheritDoc} 2766 * 2767 * @hide 2768 */ 2769 @Override 2770 public void dispatchStartTemporaryDetach() { 2771 super.dispatchStartTemporaryDetach(); 2772 final int count = mChildrenCount; 2773 final View[] children = mChildren; 2774 for (int i = 0; i < count; i++) { 2775 children[i].dispatchStartTemporaryDetach(); 2776 } 2777 } 2778 2779 /** 2780 * {@inheritDoc} 2781 * 2782 * @hide 2783 */ 2784 @Override 2785 public void dispatchFinishTemporaryDetach() { 2786 super.dispatchFinishTemporaryDetach(); 2787 final int count = mChildrenCount; 2788 final View[] children = mChildren; 2789 for (int i = 0; i < count; i++) { 2790 children[i].dispatchFinishTemporaryDetach(); 2791 } 2792 } 2793 2794 /** 2795 * {@inheritDoc} 2796 */ 2797 @Override 2798 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2799 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2800 super.dispatchAttachedToWindow(info, visibility); 2801 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2802 2803 final int count = mChildrenCount; 2804 final View[] children = mChildren; 2805 for (int i = 0; i < count; i++) { 2806 final View child = children[i]; 2807 child.dispatchAttachedToWindow(info, 2808 visibility | (child.mViewFlags & VISIBILITY_MASK)); 2809 } 2810 } 2811 2812 @Override 2813 void dispatchScreenStateChanged(int screenState) { 2814 super.dispatchScreenStateChanged(screenState); 2815 2816 final int count = mChildrenCount; 2817 final View[] children = mChildren; 2818 for (int i = 0; i < count; i++) { 2819 children[i].dispatchScreenStateChanged(screenState); 2820 } 2821 } 2822 2823 @Override 2824 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2825 boolean handled = false; 2826 if (includeForAccessibility()) { 2827 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2828 if (handled) { 2829 return handled; 2830 } 2831 } 2832 // Let our children have a shot in populating the event. 2833 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2834 try { 2835 final int childCount = children.getChildCount(); 2836 for (int i = 0; i < childCount; i++) { 2837 View child = children.getChildAt(i); 2838 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2839 handled = child.dispatchPopulateAccessibilityEvent(event); 2840 if (handled) { 2841 return handled; 2842 } 2843 } 2844 } 2845 } finally { 2846 children.recycle(); 2847 } 2848 return false; 2849 } 2850 2851 @Override 2852 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2853 super.onInitializeAccessibilityNodeInfoInternal(info); 2854 if (mAttachInfo != null) { 2855 final ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2856 childrenForAccessibility.clear(); 2857 addChildrenForAccessibility(childrenForAccessibility); 2858 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2859 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2860 final View child = childrenForAccessibility.get(i); 2861 info.addChildUnchecked(child); 2862 } 2863 childrenForAccessibility.clear(); 2864 } 2865 } 2866 2867 @Override 2868 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2869 super.onInitializeAccessibilityEventInternal(event); 2870 event.setClassName(ViewGroup.class.getName()); 2871 } 2872 2873 @Override 2874 public void notifySubtreeAccessibilityStateChanged(View child, View source, int changeType) { 2875 // If this is a live region, we should send a subtree change event 2876 // from this view. Otherwise, we can let it propagate up. 2877 if (getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE) { 2878 notifyViewAccessibilityStateChangedIfNeeded(changeType); 2879 } else if (mParent != null) { 2880 try { 2881 mParent.notifySubtreeAccessibilityStateChanged(this, source, changeType); 2882 } catch (AbstractMethodError e) { 2883 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 2884 " does not fully implement ViewParent", e); 2885 } 2886 } 2887 } 2888 2889 @Override 2890 void resetSubtreeAccessibilityStateChanged() { 2891 super.resetSubtreeAccessibilityStateChanged(); 2892 View[] children = mChildren; 2893 final int childCount = mChildrenCount; 2894 for (int i = 0; i < childCount; i++) { 2895 children[i].resetSubtreeAccessibilityStateChanged(); 2896 } 2897 } 2898 2899 /** 2900 * {@inheritDoc} 2901 */ 2902 @Override 2903 void dispatchDetachedFromWindow() { 2904 // If we still have a touch target, we are still in the process of 2905 // dispatching motion events to a child; we need to get rid of that 2906 // child to avoid dispatching events to it after the window is torn 2907 // down. To make sure we keep the child in a consistent state, we 2908 // first send it an ACTION_CANCEL motion event. 2909 cancelAndClearTouchTargets(null); 2910 2911 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2912 exitHoverTargets(); 2913 2914 // In case view is detached while transition is running 2915 mLayoutCalledWhileSuppressed = false; 2916 2917 // Tear down our drag tracking 2918 mDragNotifiedChildren = null; 2919 if (mCurrentDrag != null) { 2920 mCurrentDrag.recycle(); 2921 mCurrentDrag = null; 2922 } 2923 2924 final int count = mChildrenCount; 2925 final View[] children = mChildren; 2926 for (int i = 0; i < count; i++) { 2927 children[i].dispatchDetachedFromWindow(); 2928 } 2929 clearDisappearingChildren(); 2930 super.dispatchDetachedFromWindow(); 2931 } 2932 2933 /** 2934 * @hide 2935 */ 2936 @Override 2937 protected void internalSetPadding(int left, int top, int right, int bottom) { 2938 super.internalSetPadding(left, top, right, bottom); 2939 2940 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2941 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2942 } else { 2943 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2944 } 2945 } 2946 2947 /** 2948 * {@inheritDoc} 2949 */ 2950 @Override 2951 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2952 super.dispatchSaveInstanceState(container); 2953 final int count = mChildrenCount; 2954 final View[] children = mChildren; 2955 for (int i = 0; i < count; i++) { 2956 View c = children[i]; 2957 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2958 c.dispatchSaveInstanceState(container); 2959 } 2960 } 2961 } 2962 2963 /** 2964 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2965 * to only this view, not to its children. For use when overriding 2966 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2967 * subclasses to freeze their own state but not the state of their children. 2968 * 2969 * @param container the container 2970 */ 2971 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2972 super.dispatchSaveInstanceState(container); 2973 } 2974 2975 /** 2976 * {@inheritDoc} 2977 */ 2978 @Override 2979 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2980 super.dispatchRestoreInstanceState(container); 2981 final int count = mChildrenCount; 2982 final View[] children = mChildren; 2983 for (int i = 0; i < count; i++) { 2984 View c = children[i]; 2985 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2986 c.dispatchRestoreInstanceState(container); 2987 } 2988 } 2989 } 2990 2991 /** 2992 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2993 * to only this view, not to its children. For use when overriding 2994 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2995 * subclasses to thaw their own state but not the state of their children. 2996 * 2997 * @param container the container 2998 */ 2999 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 3000 super.dispatchRestoreInstanceState(container); 3001 } 3002 3003 /** 3004 * Enables or disables the drawing cache for each child of this view group. 3005 * 3006 * @param enabled true to enable the cache, false to dispose of it 3007 */ 3008 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 3009 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 3010 final View[] children = mChildren; 3011 final int count = mChildrenCount; 3012 for (int i = 0; i < count; i++) { 3013 children[i].setDrawingCacheEnabled(enabled); 3014 } 3015 } 3016 } 3017 3018 @Override 3019 protected void onAnimationStart() { 3020 super.onAnimationStart(); 3021 3022 // When this ViewGroup's animation starts, build the cache for the children 3023 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3024 final int count = mChildrenCount; 3025 final View[] children = mChildren; 3026 final boolean buildCache = !isHardwareAccelerated(); 3027 3028 for (int i = 0; i < count; i++) { 3029 final View child = children[i]; 3030 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 3031 child.setDrawingCacheEnabled(true); 3032 if (buildCache) { 3033 child.buildDrawingCache(true); 3034 } 3035 } 3036 } 3037 3038 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 3039 } 3040 } 3041 3042 @Override 3043 protected void onAnimationEnd() { 3044 super.onAnimationEnd(); 3045 3046 // When this ViewGroup's animation ends, destroy the cache of the children 3047 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3048 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 3049 3050 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 3051 setChildrenDrawingCacheEnabled(false); 3052 } 3053 } 3054 } 3055 3056 @Override 3057 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 3058 int count = mChildrenCount; 3059 int[] visibilities = null; 3060 3061 if (skipChildren) { 3062 visibilities = new int[count]; 3063 for (int i = 0; i < count; i++) { 3064 View child = getChildAt(i); 3065 visibilities[i] = child.getVisibility(); 3066 if (visibilities[i] == View.VISIBLE) { 3067 child.setVisibility(INVISIBLE); 3068 } 3069 } 3070 } 3071 3072 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 3073 3074 if (skipChildren) { 3075 for (int i = 0; i < count; i++) { 3076 getChildAt(i).setVisibility(visibilities[i]); 3077 } 3078 } 3079 3080 return b; 3081 } 3082 3083 /** Return true if this ViewGroup is laying out using optical bounds. */ 3084 boolean isLayoutModeOptical() { 3085 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 3086 } 3087 3088 Insets computeOpticalInsets() { 3089 if (isLayoutModeOptical()) { 3090 int left = 0; 3091 int top = 0; 3092 int right = 0; 3093 int bottom = 0; 3094 for (int i = 0; i < mChildrenCount; i++) { 3095 View child = getChildAt(i); 3096 if (child.getVisibility() == VISIBLE) { 3097 Insets insets = child.getOpticalInsets(); 3098 left = Math.max(left, insets.left); 3099 top = Math.max(top, insets.top); 3100 right = Math.max(right, insets.right); 3101 bottom = Math.max(bottom, insets.bottom); 3102 } 3103 } 3104 return Insets.of(left, top, right, bottom); 3105 } else { 3106 return Insets.NONE; 3107 } 3108 } 3109 3110 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 3111 if (x1 != x2 && y1 != y2) { 3112 if (x1 > x2) { 3113 int tmp = x1; x1 = x2; x2 = tmp; 3114 } 3115 if (y1 > y2) { 3116 int tmp = y1; y1 = y2; y2 = tmp; 3117 } 3118 canvas.drawRect(x1, y1, x2, y2, paint); 3119 } 3120 } 3121 3122 private static int sign(int x) { 3123 return (x >= 0) ? 1 : -1; 3124 } 3125 3126 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 3127 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 3128 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 3129 } 3130 3131 private int dipsToPixels(int dips) { 3132 float scale = getContext().getResources().getDisplayMetrics().density; 3133 return (int) (dips * scale + 0.5f); 3134 } 3135 3136 private static void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 3137 int lineLength, int lineWidth) { 3138 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 3139 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 3140 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 3141 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 3142 } 3143 3144 private static void fillDifference(Canvas canvas, 3145 int x2, int y2, int x3, int y3, 3146 int dx1, int dy1, int dx2, int dy2, Paint paint) { 3147 int x1 = x2 - dx1; 3148 int y1 = y2 - dy1; 3149 3150 int x4 = x3 + dx2; 3151 int y4 = y3 + dy2; 3152 3153 fillRect(canvas, paint, x1, y1, x4, y2); 3154 fillRect(canvas, paint, x1, y2, x2, y3); 3155 fillRect(canvas, paint, x3, y2, x4, y3); 3156 fillRect(canvas, paint, x1, y3, x4, y4); 3157 } 3158 3159 /** 3160 * @hide 3161 */ 3162 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 3163 for (int i = 0; i < getChildCount(); i++) { 3164 View c = getChildAt(i); 3165 c.getLayoutParams().onDebugDraw(c, canvas, paint); 3166 } 3167 } 3168 3169 /** 3170 * @hide 3171 */ 3172 protected void onDebugDraw(Canvas canvas) { 3173 Paint paint = getDebugPaint(); 3174 3175 // Draw optical bounds 3176 { 3177 paint.setColor(Color.RED); 3178 paint.setStyle(Paint.Style.STROKE); 3179 3180 for (int i = 0; i < getChildCount(); i++) { 3181 View c = getChildAt(i); 3182 Insets insets = c.getOpticalInsets(); 3183 3184 drawRect(canvas, paint, 3185 c.getLeft() + insets.left, 3186 c.getTop() + insets.top, 3187 c.getRight() - insets.right - 1, 3188 c.getBottom() - insets.bottom - 1); 3189 } 3190 } 3191 3192 // Draw margins 3193 { 3194 paint.setColor(Color.argb(63, 255, 0, 255)); 3195 paint.setStyle(Paint.Style.FILL); 3196 3197 onDebugDrawMargins(canvas, paint); 3198 } 3199 3200 // Draw clip bounds 3201 { 3202 paint.setColor(Color.rgb(63, 127, 255)); 3203 paint.setStyle(Paint.Style.FILL); 3204 3205 int lineLength = dipsToPixels(8); 3206 int lineWidth = dipsToPixels(1); 3207 for (int i = 0; i < getChildCount(); i++) { 3208 View c = getChildAt(i); 3209 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 3210 paint, lineLength, lineWidth); 3211 } 3212 } 3213 } 3214 3215 /** 3216 * {@inheritDoc} 3217 */ 3218 @Override 3219 protected void dispatchDraw(Canvas canvas) { 3220 boolean usingRenderNodeProperties = canvas.isRecordingFor(mRenderNode); 3221 final int childrenCount = mChildrenCount; 3222 final View[] children = mChildren; 3223 int flags = mGroupFlags; 3224 3225 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 3226 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3227 3228 final boolean buildCache = !isHardwareAccelerated(); 3229 for (int i = 0; i < childrenCount; i++) { 3230 final View child = children[i]; 3231 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 3232 final LayoutParams params = child.getLayoutParams(); 3233 attachLayoutAnimationParameters(child, params, i, childrenCount); 3234 bindLayoutAnimation(child); 3235 if (cache) { 3236 child.setDrawingCacheEnabled(true); 3237 if (buildCache) { 3238 child.buildDrawingCache(true); 3239 } 3240 } 3241 } 3242 } 3243 3244 final LayoutAnimationController controller = mLayoutAnimationController; 3245 if (controller.willOverlap()) { 3246 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 3247 } 3248 3249 controller.start(); 3250 3251 mGroupFlags &= ~FLAG_RUN_ANIMATION; 3252 mGroupFlags &= ~FLAG_ANIMATION_DONE; 3253 3254 if (cache) { 3255 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 3256 } 3257 3258 if (mAnimationListener != null) { 3259 mAnimationListener.onAnimationStart(controller.getAnimation()); 3260 } 3261 } 3262 3263 int clipSaveCount = 0; 3264 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 3265 if (clipToPadding) { 3266 clipSaveCount = canvas.save(); 3267 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 3268 mScrollX + mRight - mLeft - mPaddingRight, 3269 mScrollY + mBottom - mTop - mPaddingBottom); 3270 } 3271 3272 // We will draw our child's animation, let's reset the flag 3273 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 3274 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 3275 3276 boolean more = false; 3277 final long drawingTime = getDrawingTime(); 3278 3279 if (usingRenderNodeProperties) canvas.insertReorderBarrier(); 3280 // Only use the preordered list if not HW accelerated, since the HW pipeline will do the 3281 // draw reordering internally 3282 final ArrayList<View> preorderedList = usingRenderNodeProperties 3283 ? null : buildOrderedChildList(); 3284 final boolean customOrder = preorderedList == null 3285 && isChildrenDrawingOrderEnabled(); 3286 for (int i = 0; i < childrenCount; i++) { 3287 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 3288 final View child = (preorderedList == null) 3289 ? children[childIndex] : preorderedList.get(childIndex); 3290 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 3291 more |= drawChild(canvas, child, drawingTime); 3292 } 3293 } 3294 if (preorderedList != null) preorderedList.clear(); 3295 3296 // Draw any disappearing views that have animations 3297 if (mDisappearingChildren != null) { 3298 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3299 final int disappearingCount = disappearingChildren.size() - 1; 3300 // Go backwards -- we may delete as animations finish 3301 for (int i = disappearingCount; i >= 0; i--) { 3302 final View child = disappearingChildren.get(i); 3303 more |= drawChild(canvas, child, drawingTime); 3304 } 3305 } 3306 if (usingRenderNodeProperties) canvas.insertInorderBarrier(); 3307 3308 if (debugDraw()) { 3309 onDebugDraw(canvas); 3310 } 3311 3312 if (clipToPadding) { 3313 canvas.restoreToCount(clipSaveCount); 3314 } 3315 3316 // mGroupFlags might have been updated by drawChild() 3317 flags = mGroupFlags; 3318 3319 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 3320 invalidate(true); 3321 } 3322 3323 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 3324 mLayoutAnimationController.isDone() && !more) { 3325 // We want to erase the drawing cache and notify the listener after the 3326 // next frame is drawn because one extra invalidate() is caused by 3327 // drawChild() after the animation is over 3328 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 3329 final Runnable end = new Runnable() { 3330 public void run() { 3331 notifyAnimationListener(); 3332 } 3333 }; 3334 post(end); 3335 } 3336 } 3337 3338 /** 3339 * Returns the ViewGroupOverlay for this view group, creating it if it does 3340 * not yet exist. In addition to {@link ViewOverlay}'s support for drawables, 3341 * {@link ViewGroupOverlay} allows views to be added to the overlay. These 3342 * views, like overlay drawables, are visual-only; they do not receive input 3343 * events and should not be used as anything other than a temporary 3344 * representation of a view in a parent container, such as might be used 3345 * by an animation effect. 3346 * 3347 * <p>Note: Overlays do not currently work correctly with {@link 3348 * SurfaceView} or {@link TextureView}; contents in overlays for these 3349 * types of views may not display correctly.</p> 3350 * 3351 * @return The ViewGroupOverlay object for this view. 3352 * @see ViewGroupOverlay 3353 */ 3354 @Override 3355 public ViewGroupOverlay getOverlay() { 3356 if (mOverlay == null) { 3357 mOverlay = new ViewGroupOverlay(mContext, this); 3358 } 3359 return (ViewGroupOverlay) mOverlay; 3360 } 3361 3362 /** 3363 * Returns the index of the child to draw for this iteration. Override this 3364 * if you want to change the drawing order of children. By default, it 3365 * returns i. 3366 * <p> 3367 * NOTE: In order for this method to be called, you must enable child ordering 3368 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 3369 * 3370 * @param i The current iteration. 3371 * @return The index of the child to draw this iteration. 3372 * 3373 * @see #setChildrenDrawingOrderEnabled(boolean) 3374 * @see #isChildrenDrawingOrderEnabled() 3375 */ 3376 protected int getChildDrawingOrder(int childCount, int i) { 3377 return i; 3378 } 3379 3380 private boolean hasChildWithZ() { 3381 for (int i = 0; i < mChildrenCount; i++) { 3382 if (mChildren[i].getZ() != 0) return true; 3383 } 3384 return false; 3385 } 3386 3387 /** 3388 * Populates (and returns) mPreSortedChildren with a pre-ordered list of the View's children, 3389 * sorted first by Z, then by child drawing order (if applicable). This list must be cleared 3390 * after use to avoid leaking child Views. 3391 * 3392 * Uses a stable, insertion sort which is commonly O(n) for ViewGroups with very few elevated 3393 * children. 3394 */ 3395 ArrayList<View> buildOrderedChildList() { 3396 final int count = mChildrenCount; 3397 if (count <= 1 || !hasChildWithZ()) return null; 3398 3399 if (mPreSortedChildren == null) { 3400 mPreSortedChildren = new ArrayList<View>(count); 3401 } else { 3402 mPreSortedChildren.ensureCapacity(count); 3403 } 3404 3405 final boolean useCustomOrder = isChildrenDrawingOrderEnabled(); 3406 for (int i = 0; i < mChildrenCount; i++) { 3407 // add next child (in child order) to end of list 3408 int childIndex = useCustomOrder ? getChildDrawingOrder(mChildrenCount, i) : i; 3409 View nextChild = mChildren[childIndex]; 3410 float currentZ = nextChild.getZ(); 3411 3412 // insert ahead of any Views with greater Z 3413 int insertIndex = i; 3414 while (insertIndex > 0 && mPreSortedChildren.get(insertIndex - 1).getZ() > currentZ) { 3415 insertIndex--; 3416 } 3417 mPreSortedChildren.add(insertIndex, nextChild); 3418 } 3419 return mPreSortedChildren; 3420 } 3421 3422 private void notifyAnimationListener() { 3423 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 3424 mGroupFlags |= FLAG_ANIMATION_DONE; 3425 3426 if (mAnimationListener != null) { 3427 final Runnable end = new Runnable() { 3428 public void run() { 3429 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 3430 } 3431 }; 3432 post(end); 3433 } 3434 3435 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3436 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 3437 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 3438 setChildrenDrawingCacheEnabled(false); 3439 } 3440 } 3441 3442 invalidate(true); 3443 } 3444 3445 /** 3446 * This method is used to cause children of this ViewGroup to restore or recreate their 3447 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 3448 * to recreate its own display list, which would happen if it went through the normal 3449 * draw/dispatchDraw mechanisms. 3450 * 3451 * @hide 3452 */ 3453 @Override 3454 protected void dispatchGetDisplayList() { 3455 final int count = mChildrenCount; 3456 final View[] children = mChildren; 3457 for (int i = 0; i < count; i++) { 3458 final View child = children[i]; 3459 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 3460 child.hasStaticLayer()) { 3461 recreateChildDisplayList(child); 3462 } 3463 } 3464 if (mOverlay != null) { 3465 View overlayView = mOverlay.getOverlayView(); 3466 recreateChildDisplayList(overlayView); 3467 } 3468 if (mDisappearingChildren != null) { 3469 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3470 final int disappearingCount = disappearingChildren.size(); 3471 for (int i = 0; i < disappearingCount; ++i) { 3472 final View child = disappearingChildren.get(i); 3473 recreateChildDisplayList(child); 3474 } 3475 } 3476 } 3477 3478 private void recreateChildDisplayList(View child) { 3479 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 3480 == PFLAG_INVALIDATED; 3481 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3482 child.getDisplayList(); 3483 child.mRecreateDisplayList = false; 3484 } 3485 3486 /** 3487 * Draw one child of this View Group. This method is responsible for getting 3488 * the canvas in the right state. This includes clipping, translating so 3489 * that the child's scrolled origin is at 0, 0, and applying any animation 3490 * transformations. 3491 * 3492 * @param canvas The canvas on which to draw the child 3493 * @param child Who to draw 3494 * @param drawingTime The time at which draw is occurring 3495 * @return True if an invalidate() was issued 3496 */ 3497 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3498 return child.draw(canvas, this, drawingTime); 3499 } 3500 3501 /** 3502 * Returns whether this group's children are clipped to their bounds before drawing. 3503 * The default value is true. 3504 * @see #setClipChildren(boolean) 3505 * 3506 * @return True if the group's children will be clipped to their bounds, 3507 * false otherwise. 3508 */ 3509 @ViewDebug.ExportedProperty(category = "drawing") 3510 public boolean getClipChildren() { 3511 return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0); 3512 } 3513 3514 /** 3515 * By default, children are clipped to their bounds before drawing. This 3516 * allows view groups to override this behavior for animations, etc. 3517 * 3518 * @param clipChildren true to clip children to their bounds, 3519 * false otherwise 3520 * @attr ref android.R.styleable#ViewGroup_clipChildren 3521 */ 3522 public void setClipChildren(boolean clipChildren) { 3523 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3524 if (clipChildren != previousValue) { 3525 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3526 for (int i = 0; i < mChildrenCount; ++i) { 3527 View child = getChildAt(i); 3528 if (child.mRenderNode != null) { 3529 child.mRenderNode.setClipToBounds(clipChildren); 3530 } 3531 } 3532 invalidate(true); 3533 } 3534 } 3535 3536 /** 3537 * By default, children are clipped to the padding of the ViewGroup. This 3538 * allows view groups to override this behavior 3539 * 3540 * @param clipToPadding true to clip children to the padding of the 3541 * group, false otherwise 3542 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3543 */ 3544 public void setClipToPadding(boolean clipToPadding) { 3545 if (hasBooleanFlag(FLAG_CLIP_TO_PADDING) != clipToPadding) { 3546 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3547 invalidate(true); 3548 } 3549 } 3550 3551 /** 3552 * Check if this ViewGroup is configured to clip child views to its padding. 3553 * 3554 * @return true if this ViewGroup clips children to its padding, false otherwise 3555 * 3556 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3557 */ 3558 @ViewDebug.ExportedProperty(category = "drawing") 3559 public boolean getClipToPadding() { 3560 return hasBooleanFlag(FLAG_CLIP_TO_PADDING); 3561 } 3562 3563 /** 3564 * {@inheritDoc} 3565 */ 3566 @Override 3567 public void dispatchSetSelected(boolean selected) { 3568 final View[] children = mChildren; 3569 final int count = mChildrenCount; 3570 for (int i = 0; i < count; i++) { 3571 children[i].setSelected(selected); 3572 } 3573 } 3574 3575 /** 3576 * {@inheritDoc} 3577 */ 3578 @Override 3579 public void dispatchSetActivated(boolean activated) { 3580 final View[] children = mChildren; 3581 final int count = mChildrenCount; 3582 for (int i = 0; i < count; i++) { 3583 children[i].setActivated(activated); 3584 } 3585 } 3586 3587 @Override 3588 protected void dispatchSetPressed(boolean pressed) { 3589 final View[] children = mChildren; 3590 final int count = mChildrenCount; 3591 for (int i = 0; i < count; i++) { 3592 final View child = children[i]; 3593 // Children that are clickable on their own should not 3594 // show a pressed state when their parent view does. 3595 // Clearing a pressed state always propagates. 3596 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3597 child.setPressed(pressed); 3598 } 3599 } 3600 } 3601 3602 @Override 3603 void dispatchCancelPendingInputEvents() { 3604 super.dispatchCancelPendingInputEvents(); 3605 3606 final View[] children = mChildren; 3607 final int count = mChildrenCount; 3608 for (int i = 0; i < count; i++) { 3609 children[i].dispatchCancelPendingInputEvents(); 3610 } 3611 } 3612 3613 /** 3614 * When this property is set to true, this ViewGroup supports static transformations on 3615 * children; this causes 3616 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3617 * invoked when a child is drawn. 3618 * 3619 * Any subclass overriding 3620 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3621 * set this property to true. 3622 * 3623 * @param enabled True to enable static transformations on children, false otherwise. 3624 * 3625 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3626 */ 3627 protected void setStaticTransformationsEnabled(boolean enabled) { 3628 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3629 } 3630 3631 /** 3632 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3633 * boolean to indicate whether a static transform was set. The default implementation 3634 * simply returns <code>false</code>; subclasses may override this method for different 3635 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3636 * for this method to be called. 3637 * 3638 * @param child The child view whose static transform is being requested 3639 * @param t The Transformation which will hold the result 3640 * @return true if the transformation was set, false otherwise 3641 * @see #setStaticTransformationsEnabled(boolean) 3642 */ 3643 protected boolean getChildStaticTransformation(View child, Transformation t) { 3644 return false; 3645 } 3646 3647 Transformation getChildTransformation() { 3648 if (mChildTransformation == null) { 3649 mChildTransformation = new Transformation(); 3650 } 3651 return mChildTransformation; 3652 } 3653 3654 /** 3655 * {@hide} 3656 */ 3657 @Override 3658 protected View findViewTraversal(int id) { 3659 if (id == mID) { 3660 return this; 3661 } 3662 3663 final View[] where = mChildren; 3664 final int len = mChildrenCount; 3665 3666 for (int i = 0; i < len; i++) { 3667 View v = where[i]; 3668 3669 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3670 v = v.findViewById(id); 3671 3672 if (v != null) { 3673 return v; 3674 } 3675 } 3676 } 3677 3678 return null; 3679 } 3680 3681 /** 3682 * {@hide} 3683 */ 3684 @Override 3685 protected View findViewWithTagTraversal(Object tag) { 3686 if (tag != null && tag.equals(mTag)) { 3687 return this; 3688 } 3689 3690 final View[] where = mChildren; 3691 final int len = mChildrenCount; 3692 3693 for (int i = 0; i < len; i++) { 3694 View v = where[i]; 3695 3696 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3697 v = v.findViewWithTag(tag); 3698 3699 if (v != null) { 3700 return v; 3701 } 3702 } 3703 } 3704 3705 return null; 3706 } 3707 3708 /** 3709 * {@hide} 3710 */ 3711 @Override 3712 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3713 if (predicate.apply(this)) { 3714 return this; 3715 } 3716 3717 final View[] where = mChildren; 3718 final int len = mChildrenCount; 3719 3720 for (int i = 0; i < len; i++) { 3721 View v = where[i]; 3722 3723 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3724 v = v.findViewByPredicate(predicate); 3725 3726 if (v != null) { 3727 return v; 3728 } 3729 } 3730 } 3731 3732 return null; 3733 } 3734 3735 /** 3736 * <p>Adds a child view. If no layout parameters are already set on the child, the 3737 * default parameters for this ViewGroup are set on the child.</p> 3738 * 3739 * <p><strong>Note:</strong> do not invoke this method from 3740 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3741 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3742 * 3743 * @param child the child view to add 3744 * 3745 * @see #generateDefaultLayoutParams() 3746 */ 3747 public void addView(View child) { 3748 addView(child, -1); 3749 } 3750 3751 /** 3752 * Adds a child view. If no layout parameters are already set on the child, the 3753 * default parameters for this ViewGroup are set on the child. 3754 * 3755 * <p><strong>Note:</strong> do not invoke this method from 3756 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3757 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3758 * 3759 * @param child the child view to add 3760 * @param index the position at which to add the child 3761 * 3762 * @see #generateDefaultLayoutParams() 3763 */ 3764 public void addView(View child, int index) { 3765 if (child == null) { 3766 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 3767 } 3768 LayoutParams params = child.getLayoutParams(); 3769 if (params == null) { 3770 params = generateDefaultLayoutParams(); 3771 if (params == null) { 3772 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3773 } 3774 } 3775 addView(child, index, params); 3776 } 3777 3778 /** 3779 * Adds a child view with this ViewGroup's default layout parameters and the 3780 * specified width and height. 3781 * 3782 * <p><strong>Note:</strong> do not invoke this method from 3783 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3784 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3785 * 3786 * @param child the child view to add 3787 */ 3788 public void addView(View child, int width, int height) { 3789 final LayoutParams params = generateDefaultLayoutParams(); 3790 params.width = width; 3791 params.height = height; 3792 addView(child, -1, params); 3793 } 3794 3795 /** 3796 * Adds a child view with the specified layout parameters. 3797 * 3798 * <p><strong>Note:</strong> do not invoke this method from 3799 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3800 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3801 * 3802 * @param child the child view to add 3803 * @param params the layout parameters to set on the child 3804 */ 3805 public void addView(View child, LayoutParams params) { 3806 addView(child, -1, params); 3807 } 3808 3809 /** 3810 * Adds a child view with the specified layout parameters. 3811 * 3812 * <p><strong>Note:</strong> do not invoke this method from 3813 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3814 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3815 * 3816 * @param child the child view to add 3817 * @param index the position at which to add the child 3818 * @param params the layout parameters to set on the child 3819 */ 3820 public void addView(View child, int index, LayoutParams params) { 3821 if (DBG) { 3822 System.out.println(this + " addView"); 3823 } 3824 3825 if (child == null) { 3826 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 3827 } 3828 3829 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3830 // therefore, we call requestLayout() on ourselves before, so that the child's request 3831 // will be blocked at our level 3832 requestLayout(); 3833 invalidate(true); 3834 addViewInner(child, index, params, false); 3835 } 3836 3837 /** 3838 * {@inheritDoc} 3839 */ 3840 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3841 if (!checkLayoutParams(params)) { 3842 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3843 } 3844 if (view.mParent != this) { 3845 throw new IllegalArgumentException("Given view not a child of " + this); 3846 } 3847 view.setLayoutParams(params); 3848 } 3849 3850 /** 3851 * {@inheritDoc} 3852 */ 3853 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3854 return p != null; 3855 } 3856 3857 /** 3858 * Interface definition for a callback to be invoked when the hierarchy 3859 * within this view changed. The hierarchy changes whenever a child is added 3860 * to or removed from this view. 3861 */ 3862 public interface OnHierarchyChangeListener { 3863 /** 3864 * Called when a new child is added to a parent view. 3865 * 3866 * @param parent the view in which a child was added 3867 * @param child the new child view added in the hierarchy 3868 */ 3869 void onChildViewAdded(View parent, View child); 3870 3871 /** 3872 * Called when a child is removed from a parent view. 3873 * 3874 * @param parent the view from which the child was removed 3875 * @param child the child removed from the hierarchy 3876 */ 3877 void onChildViewRemoved(View parent, View child); 3878 } 3879 3880 /** 3881 * Register a callback to be invoked when a child is added to or removed 3882 * from this view. 3883 * 3884 * @param listener the callback to invoke on hierarchy change 3885 */ 3886 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3887 mOnHierarchyChangeListener = listener; 3888 } 3889 3890 /** 3891 * @hide 3892 */ 3893 protected void onViewAdded(View child) { 3894 if (mOnHierarchyChangeListener != null) { 3895 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3896 } 3897 } 3898 3899 /** 3900 * @hide 3901 */ 3902 protected void onViewRemoved(View child) { 3903 if (mOnHierarchyChangeListener != null) { 3904 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3905 } 3906 } 3907 3908 private void clearCachedLayoutMode() { 3909 if (!hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 3910 mLayoutMode = LAYOUT_MODE_UNDEFINED; 3911 } 3912 } 3913 3914 @Override 3915 protected void onAttachedToWindow() { 3916 super.onAttachedToWindow(); 3917 clearCachedLayoutMode(); 3918 } 3919 3920 @Override 3921 protected void onDetachedFromWindow() { 3922 super.onDetachedFromWindow(); 3923 clearCachedLayoutMode(); 3924 } 3925 3926 /** 3927 * Adds a view during layout. This is useful if in your onLayout() method, 3928 * you need to add more views (as does the list view for example). 3929 * 3930 * If index is negative, it means put it at the end of the list. 3931 * 3932 * @param child the view to add to the group 3933 * @param index the index at which the child must be added 3934 * @param params the layout parameters to associate with the child 3935 * @return true if the child was added, false otherwise 3936 */ 3937 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3938 return addViewInLayout(child, index, params, false); 3939 } 3940 3941 /** 3942 * Adds a view during layout. This is useful if in your onLayout() method, 3943 * you need to add more views (as does the list view for example). 3944 * 3945 * If index is negative, it means put it at the end of the list. 3946 * 3947 * @param child the view to add to the group 3948 * @param index the index at which the child must be added 3949 * @param params the layout parameters to associate with the child 3950 * @param preventRequestLayout if true, calling this method will not trigger a 3951 * layout request on child 3952 * @return true if the child was added, false otherwise 3953 */ 3954 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3955 boolean preventRequestLayout) { 3956 if (child == null) { 3957 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 3958 } 3959 child.mParent = null; 3960 addViewInner(child, index, params, preventRequestLayout); 3961 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 3962 return true; 3963 } 3964 3965 /** 3966 * Prevents the specified child to be laid out during the next layout pass. 3967 * 3968 * @param child the child on which to perform the cleanup 3969 */ 3970 protected void cleanupLayoutState(View child) { 3971 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 3972 } 3973 3974 private void addViewInner(View child, int index, LayoutParams params, 3975 boolean preventRequestLayout) { 3976 3977 if (mTransition != null) { 3978 // Don't prevent other add transitions from completing, but cancel remove 3979 // transitions to let them complete the process before we add to the container 3980 mTransition.cancel(LayoutTransition.DISAPPEARING); 3981 } 3982 3983 if (child.getParent() != null) { 3984 throw new IllegalStateException("The specified child already has a parent. " + 3985 "You must call removeView() on the child's parent first."); 3986 } 3987 3988 if (mTransition != null) { 3989 mTransition.addChild(this, child); 3990 } 3991 3992 if (!checkLayoutParams(params)) { 3993 params = generateLayoutParams(params); 3994 } 3995 3996 if (preventRequestLayout) { 3997 child.mLayoutParams = params; 3998 } else { 3999 child.setLayoutParams(params); 4000 } 4001 4002 if (index < 0) { 4003 index = mChildrenCount; 4004 } 4005 4006 addInArray(child, index); 4007 4008 // tell our children 4009 if (preventRequestLayout) { 4010 child.assignParent(this); 4011 } else { 4012 child.mParent = this; 4013 } 4014 4015 if (child.hasFocus()) { 4016 requestChildFocus(child, child.findFocus()); 4017 } 4018 4019 AttachInfo ai = mAttachInfo; 4020 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 4021 boolean lastKeepOn = ai.mKeepScreenOn; 4022 ai.mKeepScreenOn = false; 4023 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 4024 if (ai.mKeepScreenOn) { 4025 needGlobalAttributesUpdate(true); 4026 } 4027 ai.mKeepScreenOn = lastKeepOn; 4028 } 4029 4030 if (child.isLayoutDirectionInherited()) { 4031 child.resetRtlProperties(); 4032 } 4033 4034 onViewAdded(child); 4035 4036 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 4037 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 4038 } 4039 4040 if (child.hasTransientState()) { 4041 childHasTransientStateChanged(child, true); 4042 } 4043 4044 if (child.getVisibility() != View.GONE) { 4045 notifySubtreeAccessibilityStateChangedIfNeeded(); 4046 } 4047 } 4048 4049 private void addInArray(View child, int index) { 4050 View[] children = mChildren; 4051 final int count = mChildrenCount; 4052 final int size = children.length; 4053 if (index == count) { 4054 if (size == count) { 4055 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 4056 System.arraycopy(children, 0, mChildren, 0, size); 4057 children = mChildren; 4058 } 4059 children[mChildrenCount++] = child; 4060 } else if (index < count) { 4061 if (size == count) { 4062 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 4063 System.arraycopy(children, 0, mChildren, 0, index); 4064 System.arraycopy(children, index, mChildren, index + 1, count - index); 4065 children = mChildren; 4066 } else { 4067 System.arraycopy(children, index, children, index + 1, count - index); 4068 } 4069 children[index] = child; 4070 mChildrenCount++; 4071 if (mLastTouchDownIndex >= index) { 4072 mLastTouchDownIndex++; 4073 } 4074 } else { 4075 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 4076 } 4077 } 4078 4079 // This method also sets the child's mParent to null 4080 private void removeFromArray(int index) { 4081 final View[] children = mChildren; 4082 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 4083 children[index].mParent = null; 4084 } 4085 final int count = mChildrenCount; 4086 if (index == count - 1) { 4087 children[--mChildrenCount] = null; 4088 } else if (index >= 0 && index < count) { 4089 System.arraycopy(children, index + 1, children, index, count - index - 1); 4090 children[--mChildrenCount] = null; 4091 } else { 4092 throw new IndexOutOfBoundsException(); 4093 } 4094 if (mLastTouchDownIndex == index) { 4095 mLastTouchDownTime = 0; 4096 mLastTouchDownIndex = -1; 4097 } else if (mLastTouchDownIndex > index) { 4098 mLastTouchDownIndex--; 4099 } 4100 } 4101 4102 // This method also sets the children's mParent to null 4103 private void removeFromArray(int start, int count) { 4104 final View[] children = mChildren; 4105 final int childrenCount = mChildrenCount; 4106 4107 start = Math.max(0, start); 4108 final int end = Math.min(childrenCount, start + count); 4109 4110 if (start == end) { 4111 return; 4112 } 4113 4114 if (end == childrenCount) { 4115 for (int i = start; i < end; i++) { 4116 children[i].mParent = null; 4117 children[i] = null; 4118 } 4119 } else { 4120 for (int i = start; i < end; i++) { 4121 children[i].mParent = null; 4122 } 4123 4124 // Since we're looping above, we might as well do the copy, but is arraycopy() 4125 // faster than the extra 2 bounds checks we would do in the loop? 4126 System.arraycopy(children, end, children, start, childrenCount - end); 4127 4128 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 4129 children[i] = null; 4130 } 4131 } 4132 4133 mChildrenCount -= (end - start); 4134 } 4135 4136 private void bindLayoutAnimation(View child) { 4137 Animation a = mLayoutAnimationController.getAnimationForView(child); 4138 child.setAnimation(a); 4139 } 4140 4141 /** 4142 * Subclasses should override this method to set layout animation 4143 * parameters on the supplied child. 4144 * 4145 * @param child the child to associate with animation parameters 4146 * @param params the child's layout parameters which hold the animation 4147 * parameters 4148 * @param index the index of the child in the view group 4149 * @param count the number of children in the view group 4150 */ 4151 protected void attachLayoutAnimationParameters(View child, 4152 LayoutParams params, int index, int count) { 4153 LayoutAnimationController.AnimationParameters animationParams = 4154 params.layoutAnimationParameters; 4155 if (animationParams == null) { 4156 animationParams = new LayoutAnimationController.AnimationParameters(); 4157 params.layoutAnimationParameters = animationParams; 4158 } 4159 4160 animationParams.count = count; 4161 animationParams.index = index; 4162 } 4163 4164 /** 4165 * {@inheritDoc} 4166 * 4167 * <p><strong>Note:</strong> do not invoke this method from 4168 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4169 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4170 */ 4171 public void removeView(View view) { 4172 if (removeViewInternal(view)) { 4173 requestLayout(); 4174 invalidate(true); 4175 } 4176 } 4177 4178 /** 4179 * Removes a view during layout. This is useful if in your onLayout() method, 4180 * you need to remove more views. 4181 * 4182 * <p><strong>Note:</strong> do not invoke this method from 4183 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4184 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4185 * 4186 * @param view the view to remove from the group 4187 */ 4188 public void removeViewInLayout(View view) { 4189 removeViewInternal(view); 4190 } 4191 4192 /** 4193 * Removes a range of views during layout. This is useful if in your onLayout() method, 4194 * you need to remove more views. 4195 * 4196 * <p><strong>Note:</strong> do not invoke this method from 4197 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4198 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4199 * 4200 * @param start the index of the first view to remove from the group 4201 * @param count the number of views to remove from the group 4202 */ 4203 public void removeViewsInLayout(int start, int count) { 4204 removeViewsInternal(start, count); 4205 } 4206 4207 /** 4208 * Removes the view at the specified position in the group. 4209 * 4210 * <p><strong>Note:</strong> do not invoke this method from 4211 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4212 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4213 * 4214 * @param index the position in the group of the view to remove 4215 */ 4216 public void removeViewAt(int index) { 4217 removeViewInternal(index, getChildAt(index)); 4218 requestLayout(); 4219 invalidate(true); 4220 } 4221 4222 /** 4223 * Removes the specified range of views from the group. 4224 * 4225 * <p><strong>Note:</strong> do not invoke this method from 4226 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4227 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4228 * 4229 * @param start the first position in the group of the range of views to remove 4230 * @param count the number of views to remove 4231 */ 4232 public void removeViews(int start, int count) { 4233 removeViewsInternal(start, count); 4234 requestLayout(); 4235 invalidate(true); 4236 } 4237 4238 private boolean removeViewInternal(View view) { 4239 final int index = indexOfChild(view); 4240 if (index >= 0) { 4241 removeViewInternal(index, view); 4242 return true; 4243 } 4244 return false; 4245 } 4246 4247 private void removeViewInternal(int index, View view) { 4248 4249 if (mTransition != null) { 4250 mTransition.removeChild(this, view); 4251 } 4252 4253 boolean clearChildFocus = false; 4254 if (view == mFocused) { 4255 view.unFocus(null); 4256 clearChildFocus = true; 4257 } 4258 4259 view.clearAccessibilityFocus(); 4260 4261 cancelTouchTarget(view); 4262 cancelHoverTarget(view); 4263 4264 if (view.getAnimation() != null || 4265 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4266 addDisappearingView(view); 4267 } else if (view.mAttachInfo != null) { 4268 view.dispatchDetachedFromWindow(); 4269 } 4270 4271 if (view.hasTransientState()) { 4272 childHasTransientStateChanged(view, false); 4273 } 4274 4275 needGlobalAttributesUpdate(false); 4276 4277 removeFromArray(index); 4278 4279 if (clearChildFocus) { 4280 clearChildFocus(view); 4281 if (!rootViewRequestFocus()) { 4282 notifyGlobalFocusCleared(this); 4283 } 4284 } 4285 4286 onViewRemoved(view); 4287 4288 if (view.getVisibility() != View.GONE) { 4289 notifySubtreeAccessibilityStateChangedIfNeeded(); 4290 } 4291 } 4292 4293 /** 4294 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 4295 * not null, changes in layout which occur because of children being added to or removed from 4296 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 4297 * object. By default, the transition object is null (so layout changes are not animated). 4298 * 4299 * <p>Replacing a non-null transition will cause that previous transition to be 4300 * canceled, if it is currently running, to restore this container to 4301 * its correct post-transition state.</p> 4302 * 4303 * @param transition The LayoutTransition object that will animated changes in layout. A value 4304 * of <code>null</code> means no transition will run on layout changes. 4305 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 4306 */ 4307 public void setLayoutTransition(LayoutTransition transition) { 4308 if (mTransition != null) { 4309 LayoutTransition previousTransition = mTransition; 4310 previousTransition.cancel(); 4311 previousTransition.removeTransitionListener(mLayoutTransitionListener); 4312 } 4313 mTransition = transition; 4314 if (mTransition != null) { 4315 mTransition.addTransitionListener(mLayoutTransitionListener); 4316 } 4317 } 4318 4319 /** 4320 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 4321 * not null, changes in layout which occur because of children being added to or removed from 4322 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 4323 * object. By default, the transition object is null (so layout changes are not animated). 4324 * 4325 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 4326 * A value of <code>null</code> means no transition will run on layout changes. 4327 */ 4328 public LayoutTransition getLayoutTransition() { 4329 return mTransition; 4330 } 4331 4332 private void removeViewsInternal(int start, int count) { 4333 final View focused = mFocused; 4334 final boolean detach = mAttachInfo != null; 4335 boolean clearChildFocus = false; 4336 4337 final View[] children = mChildren; 4338 final int end = start + count; 4339 4340 for (int i = start; i < end; i++) { 4341 final View view = children[i]; 4342 4343 if (mTransition != null) { 4344 mTransition.removeChild(this, view); 4345 } 4346 4347 if (view == focused) { 4348 view.unFocus(null); 4349 clearChildFocus = true; 4350 } 4351 4352 view.clearAccessibilityFocus(); 4353 4354 cancelTouchTarget(view); 4355 cancelHoverTarget(view); 4356 4357 if (view.getAnimation() != null || 4358 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4359 addDisappearingView(view); 4360 } else if (detach) { 4361 view.dispatchDetachedFromWindow(); 4362 } 4363 4364 if (view.hasTransientState()) { 4365 childHasTransientStateChanged(view, false); 4366 } 4367 4368 needGlobalAttributesUpdate(false); 4369 4370 onViewRemoved(view); 4371 } 4372 4373 removeFromArray(start, count); 4374 4375 if (clearChildFocus) { 4376 clearChildFocus(focused); 4377 if (!rootViewRequestFocus()) { 4378 notifyGlobalFocusCleared(focused); 4379 } 4380 } 4381 } 4382 4383 /** 4384 * Call this method to remove all child views from the 4385 * ViewGroup. 4386 * 4387 * <p><strong>Note:</strong> do not invoke this method from 4388 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4389 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4390 */ 4391 public void removeAllViews() { 4392 removeAllViewsInLayout(); 4393 requestLayout(); 4394 invalidate(true); 4395 } 4396 4397 /** 4398 * Called by a ViewGroup subclass to remove child views from itself, 4399 * when it must first know its size on screen before it can calculate how many 4400 * child views it will render. An example is a Gallery or a ListView, which 4401 * may "have" 50 children, but actually only render the number of children 4402 * that can currently fit inside the object on screen. Do not call 4403 * this method unless you are extending ViewGroup and understand the 4404 * view measuring and layout pipeline. 4405 * 4406 * <p><strong>Note:</strong> do not invoke this method from 4407 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4408 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4409 */ 4410 public void removeAllViewsInLayout() { 4411 final int count = mChildrenCount; 4412 if (count <= 0) { 4413 return; 4414 } 4415 4416 final View[] children = mChildren; 4417 mChildrenCount = 0; 4418 4419 final View focused = mFocused; 4420 final boolean detach = mAttachInfo != null; 4421 boolean clearChildFocus = false; 4422 4423 needGlobalAttributesUpdate(false); 4424 4425 for (int i = count - 1; i >= 0; i--) { 4426 final View view = children[i]; 4427 4428 if (mTransition != null) { 4429 mTransition.removeChild(this, view); 4430 } 4431 4432 if (view == focused) { 4433 view.unFocus(null); 4434 clearChildFocus = true; 4435 } 4436 4437 view.clearAccessibilityFocus(); 4438 4439 cancelTouchTarget(view); 4440 cancelHoverTarget(view); 4441 4442 if (view.getAnimation() != null || 4443 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4444 addDisappearingView(view); 4445 } else if (detach) { 4446 view.dispatchDetachedFromWindow(); 4447 } 4448 4449 if (view.hasTransientState()) { 4450 childHasTransientStateChanged(view, false); 4451 } 4452 4453 onViewRemoved(view); 4454 4455 view.mParent = null; 4456 children[i] = null; 4457 } 4458 4459 if (clearChildFocus) { 4460 clearChildFocus(focused); 4461 if (!rootViewRequestFocus()) { 4462 notifyGlobalFocusCleared(focused); 4463 } 4464 } 4465 } 4466 4467 /** 4468 * Finishes the removal of a detached view. This method will dispatch the detached from 4469 * window event and notify the hierarchy change listener. 4470 * <p> 4471 * This method is intended to be lightweight and makes no assumptions about whether the 4472 * parent or child should be redrawn. Proper use of this method will include also making 4473 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4474 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4475 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 4476 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4477 * 4478 * @param child the child to be definitely removed from the view hierarchy 4479 * @param animate if true and the view has an animation, the view is placed in the 4480 * disappearing views list, otherwise, it is detached from the window 4481 * 4482 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4483 * @see #detachAllViewsFromParent() 4484 * @see #detachViewFromParent(View) 4485 * @see #detachViewFromParent(int) 4486 */ 4487 protected void removeDetachedView(View child, boolean animate) { 4488 if (mTransition != null) { 4489 mTransition.removeChild(this, child); 4490 } 4491 4492 if (child == mFocused) { 4493 child.clearFocus(); 4494 } 4495 4496 child.clearAccessibilityFocus(); 4497 4498 cancelTouchTarget(child); 4499 cancelHoverTarget(child); 4500 4501 if ((animate && child.getAnimation() != null) || 4502 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 4503 addDisappearingView(child); 4504 } else if (child.mAttachInfo != null) { 4505 child.dispatchDetachedFromWindow(); 4506 } 4507 4508 if (child.hasTransientState()) { 4509 childHasTransientStateChanged(child, false); 4510 } 4511 4512 onViewRemoved(child); 4513 } 4514 4515 /** 4516 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 4517 * sets the layout parameters and puts the view in the list of children so that 4518 * it can be retrieved by calling {@link #getChildAt(int)}. 4519 * <p> 4520 * This method is intended to be lightweight and makes no assumptions about whether the 4521 * parent or child should be redrawn. Proper use of this method will include also making 4522 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4523 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4524 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 4525 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4526 * <p> 4527 * This method should be called only for views which were detached from their parent. 4528 * 4529 * @param child the child to attach 4530 * @param index the index at which the child should be attached 4531 * @param params the layout parameters of the child 4532 * 4533 * @see #removeDetachedView(View, boolean) 4534 * @see #detachAllViewsFromParent() 4535 * @see #detachViewFromParent(View) 4536 * @see #detachViewFromParent(int) 4537 */ 4538 protected void attachViewToParent(View child, int index, LayoutParams params) { 4539 child.mLayoutParams = params; 4540 4541 if (index < 0) { 4542 index = mChildrenCount; 4543 } 4544 4545 addInArray(child, index); 4546 4547 child.mParent = this; 4548 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 4549 & ~PFLAG_DRAWING_CACHE_VALID) 4550 | PFLAG_DRAWN | PFLAG_INVALIDATED; 4551 this.mPrivateFlags |= PFLAG_INVALIDATED; 4552 4553 if (child.hasFocus()) { 4554 requestChildFocus(child, child.findFocus()); 4555 } 4556 } 4557 4558 /** 4559 * Detaches a view from its parent. Detaching a view should be followed 4560 * either by a call to 4561 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4562 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4563 * temporary; reattachment or removal should happen within the same drawing cycle as 4564 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4565 * call to {@link #getChildAt(int)}. 4566 * 4567 * @param child the child to detach 4568 * 4569 * @see #detachViewFromParent(int) 4570 * @see #detachViewsFromParent(int, int) 4571 * @see #detachAllViewsFromParent() 4572 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4573 * @see #removeDetachedView(View, boolean) 4574 */ 4575 protected void detachViewFromParent(View child) { 4576 removeFromArray(indexOfChild(child)); 4577 } 4578 4579 /** 4580 * Detaches a view from its parent. Detaching a view should be followed 4581 * either by a call to 4582 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4583 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4584 * temporary; reattachment or removal should happen within the same drawing cycle as 4585 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4586 * call to {@link #getChildAt(int)}. 4587 * 4588 * @param index the index of the child to detach 4589 * 4590 * @see #detachViewFromParent(View) 4591 * @see #detachAllViewsFromParent() 4592 * @see #detachViewsFromParent(int, int) 4593 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4594 * @see #removeDetachedView(View, boolean) 4595 */ 4596 protected void detachViewFromParent(int index) { 4597 removeFromArray(index); 4598 } 4599 4600 /** 4601 * Detaches a range of views from their parents. Detaching a view should be followed 4602 * either by a call to 4603 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4604 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4605 * temporary; reattachment or removal should happen within the same drawing cycle as 4606 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4607 * call to {@link #getChildAt(int)}. 4608 * 4609 * @param start the first index of the childrend range to detach 4610 * @param count the number of children to detach 4611 * 4612 * @see #detachViewFromParent(View) 4613 * @see #detachViewFromParent(int) 4614 * @see #detachAllViewsFromParent() 4615 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4616 * @see #removeDetachedView(View, boolean) 4617 */ 4618 protected void detachViewsFromParent(int start, int count) { 4619 removeFromArray(start, count); 4620 } 4621 4622 /** 4623 * Detaches all views from the parent. Detaching a view should be followed 4624 * either by a call to 4625 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4626 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4627 * temporary; reattachment or removal should happen within the same drawing cycle as 4628 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4629 * call to {@link #getChildAt(int)}. 4630 * 4631 * @see #detachViewFromParent(View) 4632 * @see #detachViewFromParent(int) 4633 * @see #detachViewsFromParent(int, int) 4634 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4635 * @see #removeDetachedView(View, boolean) 4636 */ 4637 protected void detachAllViewsFromParent() { 4638 final int count = mChildrenCount; 4639 if (count <= 0) { 4640 return; 4641 } 4642 4643 final View[] children = mChildren; 4644 mChildrenCount = 0; 4645 4646 for (int i = count - 1; i >= 0; i--) { 4647 children[i].mParent = null; 4648 children[i] = null; 4649 } 4650 } 4651 4652 /** 4653 * Don't call or override this method. It is used for the implementation of 4654 * the view hierarchy. 4655 */ 4656 public final void invalidateChild(View child, final Rect dirty) { 4657 ViewParent parent = this; 4658 4659 final AttachInfo attachInfo = mAttachInfo; 4660 if (attachInfo != null) { 4661 // If the child is drawing an animation, we want to copy this flag onto 4662 // ourselves and the parent to make sure the invalidate request goes 4663 // through 4664 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4665 == PFLAG_DRAW_ANIMATION; 4666 4667 // Check whether the child that requests the invalidate is fully opaque 4668 // Views being animated or transformed are not considered opaque because we may 4669 // be invalidating their old position and need the parent to paint behind them. 4670 Matrix childMatrix = child.getMatrix(); 4671 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4672 child.getAnimation() == null && childMatrix.isIdentity(); 4673 // Mark the child as dirty, using the appropriate flag 4674 // Make sure we do not set both flags at the same time 4675 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4676 4677 if (child.mLayerType != LAYER_TYPE_NONE) { 4678 mPrivateFlags |= PFLAG_INVALIDATED; 4679 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4680 } 4681 4682 final int[] location = attachInfo.mInvalidateChildLocation; 4683 location[CHILD_LEFT_INDEX] = child.mLeft; 4684 location[CHILD_TOP_INDEX] = child.mTop; 4685 if (!childMatrix.isIdentity() || 4686 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4687 RectF boundingRect = attachInfo.mTmpTransformRect; 4688 boundingRect.set(dirty); 4689 Matrix transformMatrix; 4690 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4691 Transformation t = attachInfo.mTmpTransformation; 4692 boolean transformed = getChildStaticTransformation(child, t); 4693 if (transformed) { 4694 transformMatrix = attachInfo.mTmpMatrix; 4695 transformMatrix.set(t.getMatrix()); 4696 if (!childMatrix.isIdentity()) { 4697 transformMatrix.preConcat(childMatrix); 4698 } 4699 } else { 4700 transformMatrix = childMatrix; 4701 } 4702 } else { 4703 transformMatrix = childMatrix; 4704 } 4705 transformMatrix.mapRect(boundingRect); 4706 dirty.set((int) (boundingRect.left - 0.5f), 4707 (int) (boundingRect.top - 0.5f), 4708 (int) (boundingRect.right + 0.5f), 4709 (int) (boundingRect.bottom + 0.5f)); 4710 } 4711 4712 do { 4713 View view = null; 4714 if (parent instanceof View) { 4715 view = (View) parent; 4716 } 4717 4718 if (drawAnimation) { 4719 if (view != null) { 4720 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4721 } else if (parent instanceof ViewRootImpl) { 4722 ((ViewRootImpl) parent).mIsAnimating = true; 4723 } 4724 } 4725 4726 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4727 // flag coming from the child that initiated the invalidate 4728 if (view != null) { 4729 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4730 view.getSolidColor() == 0) { 4731 opaqueFlag = PFLAG_DIRTY; 4732 } 4733 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4734 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4735 } 4736 } 4737 4738 parent = parent.invalidateChildInParent(location, dirty); 4739 if (view != null) { 4740 // Account for transform on current parent 4741 Matrix m = view.getMatrix(); 4742 if (!m.isIdentity()) { 4743 RectF boundingRect = attachInfo.mTmpTransformRect; 4744 boundingRect.set(dirty); 4745 m.mapRect(boundingRect); 4746 dirty.set((int) (boundingRect.left - 0.5f), 4747 (int) (boundingRect.top - 0.5f), 4748 (int) (boundingRect.right + 0.5f), 4749 (int) (boundingRect.bottom + 0.5f)); 4750 } 4751 } 4752 } while (parent != null); 4753 } 4754 } 4755 4756 /** 4757 * Don't call or override this method. It is used for the implementation of 4758 * the view hierarchy. 4759 * 4760 * This implementation returns null if this ViewGroup does not have a parent, 4761 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4762 * does not intersect with this ViewGroup's bounds. 4763 */ 4764 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4765 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4766 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4767 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4768 FLAG_OPTIMIZE_INVALIDATE) { 4769 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4770 location[CHILD_TOP_INDEX] - mScrollY); 4771 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4772 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4773 } 4774 4775 final int left = mLeft; 4776 final int top = mTop; 4777 4778 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4779 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4780 dirty.setEmpty(); 4781 } 4782 } 4783 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4784 4785 location[CHILD_LEFT_INDEX] = left; 4786 location[CHILD_TOP_INDEX] = top; 4787 4788 if (mLayerType != LAYER_TYPE_NONE) { 4789 mPrivateFlags |= PFLAG_INVALIDATED; 4790 } 4791 4792 return mParent; 4793 4794 } else { 4795 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 4796 4797 location[CHILD_LEFT_INDEX] = mLeft; 4798 location[CHILD_TOP_INDEX] = mTop; 4799 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4800 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4801 } else { 4802 // in case the dirty rect extends outside the bounds of this container 4803 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4804 } 4805 4806 if (mLayerType != LAYER_TYPE_NONE) { 4807 mPrivateFlags |= PFLAG_INVALIDATED; 4808 } 4809 4810 return mParent; 4811 } 4812 } 4813 4814 return null; 4815 } 4816 4817 /** 4818 * Native-calculated damage path 4819 * Returns false if this path was unable to complete successfully. This means 4820 * it hit a ViewParent it doesn't recognize and needs to fall back to calculating 4821 * damage area 4822 * @hide 4823 */ 4824 public boolean damageChildDeferred(View child) { 4825 ViewParent parent = getParent(); 4826 while (parent != null) { 4827 if (parent instanceof ViewGroup) { 4828 parent = parent.getParent(); 4829 } else if (parent instanceof ViewRootImpl) { 4830 ((ViewRootImpl) parent).invalidate(); 4831 return true; 4832 } else { 4833 parent = null; 4834 } 4835 } 4836 return false; 4837 } 4838 4839 /** 4840 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4841 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4842 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4843 * 4844 * @hide 4845 */ 4846 public void damageChild(View child, final Rect dirty) { 4847 if (damageChildDeferred(child)) { 4848 return; 4849 } 4850 4851 ViewParent parent = this; 4852 4853 final AttachInfo attachInfo = mAttachInfo; 4854 if (attachInfo != null) { 4855 int left = child.mLeft; 4856 int top = child.mTop; 4857 if (!child.getMatrix().isIdentity()) { 4858 child.transformRect(dirty); 4859 } 4860 4861 do { 4862 if (parent instanceof ViewGroup) { 4863 ViewGroup parentVG = (ViewGroup) parent; 4864 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4865 // Layered parents should be recreated, not just re-issued 4866 parentVG.invalidate(); 4867 parent = null; 4868 } else { 4869 parent = parentVG.damageChildInParent(left, top, dirty); 4870 left = parentVG.mLeft; 4871 top = parentVG.mTop; 4872 } 4873 } else { 4874 // Reached the top; this calls into the usual invalidate method in 4875 // ViewRootImpl, which schedules a traversal 4876 final int[] location = attachInfo.mInvalidateChildLocation; 4877 location[0] = left; 4878 location[1] = top; 4879 parent = parent.invalidateChildInParent(location, dirty); 4880 } 4881 } while (parent != null); 4882 } 4883 } 4884 4885 /** 4886 * Quick invalidation method that simply transforms the dirty rect into the parent's 4887 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4888 * 4889 * @hide 4890 */ 4891 protected ViewParent damageChildInParent(int left, int top, final Rect dirty) { 4892 if ((mPrivateFlags & PFLAG_DRAWN) != 0 4893 || (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) != 0) { 4894 dirty.offset(left - mScrollX, top - mScrollY); 4895 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4896 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4897 } 4898 4899 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4900 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4901 4902 if (!getMatrix().isIdentity()) { 4903 transformRect(dirty); 4904 } 4905 4906 return mParent; 4907 } 4908 } 4909 4910 return null; 4911 } 4912 4913 /** 4914 * Offset a rectangle that is in a descendant's coordinate 4915 * space into our coordinate space. 4916 * @param descendant A descendant of this view 4917 * @param rect A rectangle defined in descendant's coordinate space. 4918 */ 4919 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4920 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4921 } 4922 4923 /** 4924 * Offset a rectangle that is in our coordinate space into an ancestor's 4925 * coordinate space. 4926 * @param descendant A descendant of this view 4927 * @param rect A rectangle defined in descendant's coordinate space. 4928 */ 4929 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4930 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4931 } 4932 4933 /** 4934 * Helper method that offsets a rect either from parent to descendant or 4935 * descendant to parent. 4936 */ 4937 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4938 boolean offsetFromChildToParent, boolean clipToBounds) { 4939 4940 // already in the same coord system :) 4941 if (descendant == this) { 4942 return; 4943 } 4944 4945 ViewParent theParent = descendant.mParent; 4946 4947 // search and offset up to the parent 4948 while ((theParent != null) 4949 && (theParent instanceof View) 4950 && (theParent != this)) { 4951 4952 if (offsetFromChildToParent) { 4953 rect.offset(descendant.mLeft - descendant.mScrollX, 4954 descendant.mTop - descendant.mScrollY); 4955 if (clipToBounds) { 4956 View p = (View) theParent; 4957 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4958 } 4959 } else { 4960 if (clipToBounds) { 4961 View p = (View) theParent; 4962 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4963 } 4964 rect.offset(descendant.mScrollX - descendant.mLeft, 4965 descendant.mScrollY - descendant.mTop); 4966 } 4967 4968 descendant = (View) theParent; 4969 theParent = descendant.mParent; 4970 } 4971 4972 // now that we are up to this view, need to offset one more time 4973 // to get into our coordinate space 4974 if (theParent == this) { 4975 if (offsetFromChildToParent) { 4976 rect.offset(descendant.mLeft - descendant.mScrollX, 4977 descendant.mTop - descendant.mScrollY); 4978 } else { 4979 rect.offset(descendant.mScrollX - descendant.mLeft, 4980 descendant.mScrollY - descendant.mTop); 4981 } 4982 } else { 4983 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4984 } 4985 } 4986 4987 /** 4988 * Offset the vertical location of all children of this view by the specified number of pixels. 4989 * 4990 * @param offset the number of pixels to offset 4991 * 4992 * @hide 4993 */ 4994 public void offsetChildrenTopAndBottom(int offset) { 4995 final int count = mChildrenCount; 4996 final View[] children = mChildren; 4997 boolean invalidate = false; 4998 4999 for (int i = 0; i < count; i++) { 5000 final View v = children[i]; 5001 v.mTop += offset; 5002 v.mBottom += offset; 5003 if (v.mRenderNode != null) { 5004 invalidate = true; 5005 v.mRenderNode.offsetTopAndBottom(offset); 5006 } 5007 } 5008 5009 if (invalidate) { 5010 invalidateViewProperty(false, false); 5011 } 5012 notifySubtreeAccessibilityStateChangedIfNeeded(); 5013 } 5014 5015 /** 5016 * {@inheritDoc} 5017 */ 5018 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 5019 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 5020 // but for some simple tests it can be useful. If we don't have attach info this 5021 // will allocate memory. 5022 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 5023 rect.set(r); 5024 5025 if (!child.hasIdentityMatrix()) { 5026 child.getMatrix().mapRect(rect); 5027 } 5028 5029 int dx = child.mLeft - mScrollX; 5030 int dy = child.mTop - mScrollY; 5031 5032 rect.offset(dx, dy); 5033 5034 if (offset != null) { 5035 if (!child.hasIdentityMatrix()) { 5036 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 5037 : new float[2]; 5038 position[0] = offset.x; 5039 position[1] = offset.y; 5040 child.getMatrix().mapPoints(position); 5041 offset.x = (int) (position[0] + 0.5f); 5042 offset.y = (int) (position[1] + 0.5f); 5043 } 5044 offset.x += dx; 5045 offset.y += dy; 5046 } 5047 5048 boolean rectIsVisible = true; 5049 if (mParent instanceof ViewGroup && ((ViewGroup)mParent).getClipChildren()) { 5050 // clipChildren clips to the child's bounds 5051 rectIsVisible = rect.intersect(0, 0, mRight - mLeft, mBottom - mTop); 5052 } 5053 5054 if (rectIsVisible && (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { 5055 // Clip to padding 5056 rectIsVisible = rect.intersect(mPaddingLeft, mPaddingTop, 5057 mRight - mLeft - mPaddingLeft - mPaddingRight, 5058 mBottom - mTop - mPaddingTop - mPaddingBottom); 5059 } 5060 5061 if (rectIsVisible && mClipBounds != null) { 5062 // Clip to clipBounds 5063 rectIsVisible = rect.intersect(mClipBounds.left, mClipBounds.top, mClipBounds.right, 5064 mClipBounds.bottom); 5065 } 5066 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), (int) (rect.right + 0.5f), 5067 (int) (rect.bottom + 0.5f)); 5068 if (rectIsVisible && mParent != null) { 5069 rectIsVisible = mParent.getChildVisibleRect(this, r, offset); 5070 } 5071 return rectIsVisible; 5072 } 5073 5074 /** 5075 * {@inheritDoc} 5076 */ 5077 @Override 5078 public final void layout(int l, int t, int r, int b) { 5079 if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) { 5080 if (mTransition != null) { 5081 mTransition.layoutChange(this); 5082 } 5083 super.layout(l, t, r, b); 5084 } else { 5085 // record the fact that we noop'd it; request layout when transition finishes 5086 mLayoutCalledWhileSuppressed = true; 5087 } 5088 } 5089 5090 /** 5091 * {@inheritDoc} 5092 */ 5093 @Override 5094 protected abstract void onLayout(boolean changed, 5095 int l, int t, int r, int b); 5096 5097 /** 5098 * Indicates whether the view group has the ability to animate its children 5099 * after the first layout. 5100 * 5101 * @return true if the children can be animated, false otherwise 5102 */ 5103 protected boolean canAnimate() { 5104 return mLayoutAnimationController != null; 5105 } 5106 5107 /** 5108 * Runs the layout animation. Calling this method triggers a relayout of 5109 * this view group. 5110 */ 5111 public void startLayoutAnimation() { 5112 if (mLayoutAnimationController != null) { 5113 mGroupFlags |= FLAG_RUN_ANIMATION; 5114 requestLayout(); 5115 } 5116 } 5117 5118 /** 5119 * Schedules the layout animation to be played after the next layout pass 5120 * of this view group. This can be used to restart the layout animation 5121 * when the content of the view group changes or when the activity is 5122 * paused and resumed. 5123 */ 5124 public void scheduleLayoutAnimation() { 5125 mGroupFlags |= FLAG_RUN_ANIMATION; 5126 } 5127 5128 /** 5129 * Sets the layout animation controller used to animate the group's 5130 * children after the first layout. 5131 * 5132 * @param controller the animation controller 5133 */ 5134 public void setLayoutAnimation(LayoutAnimationController controller) { 5135 mLayoutAnimationController = controller; 5136 if (mLayoutAnimationController != null) { 5137 mGroupFlags |= FLAG_RUN_ANIMATION; 5138 } 5139 } 5140 5141 /** 5142 * Returns the layout animation controller used to animate the group's 5143 * children. 5144 * 5145 * @return the current animation controller 5146 */ 5147 public LayoutAnimationController getLayoutAnimation() { 5148 return mLayoutAnimationController; 5149 } 5150 5151 /** 5152 * Indicates whether the children's drawing cache is used during a layout 5153 * animation. By default, the drawing cache is enabled but this will prevent 5154 * nested layout animations from working. To nest animations, you must disable 5155 * the cache. 5156 * 5157 * @return true if the animation cache is enabled, false otherwise 5158 * 5159 * @see #setAnimationCacheEnabled(boolean) 5160 * @see View#setDrawingCacheEnabled(boolean) 5161 */ 5162 @ViewDebug.ExportedProperty 5163 public boolean isAnimationCacheEnabled() { 5164 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 5165 } 5166 5167 /** 5168 * Enables or disables the children's drawing cache during a layout animation. 5169 * By default, the drawing cache is enabled but this will prevent nested 5170 * layout animations from working. To nest animations, you must disable the 5171 * cache. 5172 * 5173 * @param enabled true to enable the animation cache, false otherwise 5174 * 5175 * @see #isAnimationCacheEnabled() 5176 * @see View#setDrawingCacheEnabled(boolean) 5177 */ 5178 public void setAnimationCacheEnabled(boolean enabled) { 5179 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 5180 } 5181 5182 /** 5183 * Indicates whether this ViewGroup will always try to draw its children using their 5184 * drawing cache. By default this property is enabled. 5185 * 5186 * @return true if the animation cache is enabled, false otherwise 5187 * 5188 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5189 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5190 * @see View#setDrawingCacheEnabled(boolean) 5191 */ 5192 @ViewDebug.ExportedProperty(category = "drawing") 5193 public boolean isAlwaysDrawnWithCacheEnabled() { 5194 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 5195 } 5196 5197 /** 5198 * Indicates whether this ViewGroup will always try to draw its children using their 5199 * drawing cache. This property can be set to true when the cache rendering is 5200 * slightly different from the children's normal rendering. Renderings can be different, 5201 * for instance, when the cache's quality is set to low. 5202 * 5203 * When this property is disabled, the ViewGroup will use the drawing cache of its 5204 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 5205 * when to start using the drawing cache and when to stop using it. 5206 * 5207 * @param always true to always draw with the drawing cache, false otherwise 5208 * 5209 * @see #isAlwaysDrawnWithCacheEnabled() 5210 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5211 * @see View#setDrawingCacheEnabled(boolean) 5212 * @see View#setDrawingCacheQuality(int) 5213 */ 5214 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 5215 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 5216 } 5217 5218 /** 5219 * Indicates whether the ViewGroup is currently drawing its children using 5220 * their drawing cache. 5221 * 5222 * @return true if children should be drawn with their cache, false otherwise 5223 * 5224 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5225 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5226 */ 5227 @ViewDebug.ExportedProperty(category = "drawing") 5228 protected boolean isChildrenDrawnWithCacheEnabled() { 5229 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 5230 } 5231 5232 /** 5233 * Tells the ViewGroup to draw its children using their drawing cache. This property 5234 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 5235 * will be used only if it has been enabled. 5236 * 5237 * Subclasses should call this method to start and stop using the drawing cache when 5238 * they perform performance sensitive operations, like scrolling or animating. 5239 * 5240 * @param enabled true if children should be drawn with their cache, false otherwise 5241 * 5242 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5243 * @see #isChildrenDrawnWithCacheEnabled() 5244 */ 5245 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 5246 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 5247 } 5248 5249 /** 5250 * Indicates whether the ViewGroup is drawing its children in the order defined by 5251 * {@link #getChildDrawingOrder(int, int)}. 5252 * 5253 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 5254 * false otherwise 5255 * 5256 * @see #setChildrenDrawingOrderEnabled(boolean) 5257 * @see #getChildDrawingOrder(int, int) 5258 */ 5259 @ViewDebug.ExportedProperty(category = "drawing") 5260 protected boolean isChildrenDrawingOrderEnabled() { 5261 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 5262 } 5263 5264 /** 5265 * Tells the ViewGroup whether to draw its children in the order defined by the method 5266 * {@link #getChildDrawingOrder(int, int)}. 5267 * <p> 5268 * Note that {@link View#getZ() Z} reordering, done by {@link #dispatchDraw(Canvas)}, 5269 * will override custom child ordering done via this method. 5270 * 5271 * @param enabled true if the order of the children when drawing is determined by 5272 * {@link #getChildDrawingOrder(int, int)}, false otherwise 5273 * 5274 * @see #isChildrenDrawingOrderEnabled() 5275 * @see #getChildDrawingOrder(int, int) 5276 */ 5277 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 5278 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 5279 } 5280 5281 private boolean hasBooleanFlag(int flag) { 5282 return (mGroupFlags & flag) == flag; 5283 } 5284 5285 private void setBooleanFlag(int flag, boolean value) { 5286 if (value) { 5287 mGroupFlags |= flag; 5288 } else { 5289 mGroupFlags &= ~flag; 5290 } 5291 } 5292 5293 /** 5294 * Returns an integer indicating what types of drawing caches are kept in memory. 5295 * 5296 * @see #setPersistentDrawingCache(int) 5297 * @see #setAnimationCacheEnabled(boolean) 5298 * 5299 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 5300 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 5301 * and {@link #PERSISTENT_ALL_CACHES} 5302 */ 5303 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 5304 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 5305 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 5306 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 5307 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 5308 }) 5309 public int getPersistentDrawingCache() { 5310 return mPersistentDrawingCache; 5311 } 5312 5313 /** 5314 * Indicates what types of drawing caches should be kept in memory after 5315 * they have been created. 5316 * 5317 * @see #getPersistentDrawingCache() 5318 * @see #setAnimationCacheEnabled(boolean) 5319 * 5320 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 5321 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 5322 * and {@link #PERSISTENT_ALL_CACHES} 5323 */ 5324 public void setPersistentDrawingCache(int drawingCacheToKeep) { 5325 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 5326 } 5327 5328 private void setLayoutMode(int layoutMode, boolean explicitly) { 5329 mLayoutMode = layoutMode; 5330 setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); 5331 } 5332 5333 /** 5334 * Recursively traverse the view hierarchy, resetting the layoutMode of any 5335 * descendants that had inherited a different layoutMode from a previous parent. 5336 * Recursion terminates when a descendant's mode is: 5337 * <ul> 5338 * <li>Undefined</li> 5339 * <li>The same as the root node's</li> 5340 * <li>A mode that had been explicitly set</li> 5341 * <ul/> 5342 * The first two clauses are optimizations. 5343 * @param layoutModeOfRoot 5344 */ 5345 @Override 5346 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 5347 if (mLayoutMode == LAYOUT_MODE_UNDEFINED || 5348 mLayoutMode == layoutModeOfRoot || 5349 hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 5350 return; 5351 } 5352 setLayoutMode(LAYOUT_MODE_UNDEFINED, false); 5353 5354 // apply recursively 5355 for (int i = 0, N = getChildCount(); i < N; i++) { 5356 getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); 5357 } 5358 } 5359 5360 /** 5361 * Returns the basis of alignment during layout operations on this ViewGroup: 5362 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 5363 * <p> 5364 * If no layoutMode was explicitly set, either programmatically or in an XML resource, 5365 * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, 5366 * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. 5367 * 5368 * @return the layout mode to use during layout operations 5369 * 5370 * @see #setLayoutMode(int) 5371 */ 5372 public int getLayoutMode() { 5373 if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { 5374 int inheritedLayoutMode = (mParent instanceof ViewGroup) ? 5375 ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; 5376 setLayoutMode(inheritedLayoutMode, false); 5377 } 5378 return mLayoutMode; 5379 } 5380 5381 /** 5382 * Sets the basis of alignment during the layout of this ViewGroup. 5383 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 5384 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 5385 * 5386 * @param layoutMode the layout mode to use during layout operations 5387 * 5388 * @see #getLayoutMode() 5389 * @attr ref android.R.styleable#ViewGroup_layoutMode 5390 */ 5391 public void setLayoutMode(int layoutMode) { 5392 if (mLayoutMode != layoutMode) { 5393 invalidateInheritedLayoutMode(layoutMode); 5394 setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); 5395 requestLayout(); 5396 } 5397 } 5398 5399 /** 5400 * Returns a new set of layout parameters based on the supplied attributes set. 5401 * 5402 * @param attrs the attributes to build the layout parameters from 5403 * 5404 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 5405 * of its descendants 5406 */ 5407 public LayoutParams generateLayoutParams(AttributeSet attrs) { 5408 return new LayoutParams(getContext(), attrs); 5409 } 5410 5411 /** 5412 * Returns a safe set of layout parameters based on the supplied layout params. 5413 * When a ViewGroup is passed a View whose layout params do not pass the test of 5414 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 5415 * is invoked. This method should return a new set of layout params suitable for 5416 * this ViewGroup, possibly by copying the appropriate attributes from the 5417 * specified set of layout params. 5418 * 5419 * @param p The layout parameters to convert into a suitable set of layout parameters 5420 * for this ViewGroup. 5421 * 5422 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 5423 * of its descendants 5424 */ 5425 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 5426 return p; 5427 } 5428 5429 /** 5430 * Returns a set of default layout parameters. These parameters are requested 5431 * when the View passed to {@link #addView(View)} has no layout parameters 5432 * already set. If null is returned, an exception is thrown from addView. 5433 * 5434 * @return a set of default layout parameters or null 5435 */ 5436 protected LayoutParams generateDefaultLayoutParams() { 5437 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 5438 } 5439 5440 /** 5441 * {@inheritDoc} 5442 */ 5443 @Override 5444 protected void debug(int depth) { 5445 super.debug(depth); 5446 String output; 5447 5448 if (mFocused != null) { 5449 output = debugIndent(depth); 5450 output += "mFocused"; 5451 Log.d(VIEW_LOG_TAG, output); 5452 } 5453 if (mChildrenCount != 0) { 5454 output = debugIndent(depth); 5455 output += "{"; 5456 Log.d(VIEW_LOG_TAG, output); 5457 } 5458 int count = mChildrenCount; 5459 for (int i = 0; i < count; i++) { 5460 View child = mChildren[i]; 5461 child.debug(depth + 1); 5462 } 5463 5464 if (mChildrenCount != 0) { 5465 output = debugIndent(depth); 5466 output += "}"; 5467 Log.d(VIEW_LOG_TAG, output); 5468 } 5469 } 5470 5471 /** 5472 * Returns the position in the group of the specified child view. 5473 * 5474 * @param child the view for which to get the position 5475 * @return a positive integer representing the position of the view in the 5476 * group, or -1 if the view does not exist in the group 5477 */ 5478 public int indexOfChild(View child) { 5479 final int count = mChildrenCount; 5480 final View[] children = mChildren; 5481 for (int i = 0; i < count; i++) { 5482 if (children[i] == child) { 5483 return i; 5484 } 5485 } 5486 return -1; 5487 } 5488 5489 /** 5490 * Returns the number of children in the group. 5491 * 5492 * @return a positive integer representing the number of children in 5493 * the group 5494 */ 5495 public int getChildCount() { 5496 return mChildrenCount; 5497 } 5498 5499 /** 5500 * Returns the view at the specified position in the group. 5501 * 5502 * @param index the position at which to get the view from 5503 * @return the view at the specified position or null if the position 5504 * does not exist within the group 5505 */ 5506 public View getChildAt(int index) { 5507 if (index < 0 || index >= mChildrenCount) { 5508 return null; 5509 } 5510 return mChildren[index]; 5511 } 5512 5513 /** 5514 * Ask all of the children of this view to measure themselves, taking into 5515 * account both the MeasureSpec requirements for this view and its padding. 5516 * We skip children that are in the GONE state The heavy lifting is done in 5517 * getChildMeasureSpec. 5518 * 5519 * @param widthMeasureSpec The width requirements for this view 5520 * @param heightMeasureSpec The height requirements for this view 5521 */ 5522 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 5523 final int size = mChildrenCount; 5524 final View[] children = mChildren; 5525 for (int i = 0; i < size; ++i) { 5526 final View child = children[i]; 5527 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 5528 measureChild(child, widthMeasureSpec, heightMeasureSpec); 5529 } 5530 } 5531 } 5532 5533 /** 5534 * Ask one of the children of this view to measure itself, taking into 5535 * account both the MeasureSpec requirements for this view and its padding. 5536 * The heavy lifting is done in getChildMeasureSpec. 5537 * 5538 * @param child The child to measure 5539 * @param parentWidthMeasureSpec The width requirements for this view 5540 * @param parentHeightMeasureSpec The height requirements for this view 5541 */ 5542 protected void measureChild(View child, int parentWidthMeasureSpec, 5543 int parentHeightMeasureSpec) { 5544 final LayoutParams lp = child.getLayoutParams(); 5545 5546 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5547 mPaddingLeft + mPaddingRight, lp.width); 5548 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5549 mPaddingTop + mPaddingBottom, lp.height); 5550 5551 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5552 } 5553 5554 /** 5555 * Ask one of the children of this view to measure itself, taking into 5556 * account both the MeasureSpec requirements for this view and its padding 5557 * and margins. The child must have MarginLayoutParams The heavy lifting is 5558 * done in getChildMeasureSpec. 5559 * 5560 * @param child The child to measure 5561 * @param parentWidthMeasureSpec The width requirements for this view 5562 * @param widthUsed Extra space that has been used up by the parent 5563 * horizontally (possibly by other children of the parent) 5564 * @param parentHeightMeasureSpec The height requirements for this view 5565 * @param heightUsed Extra space that has been used up by the parent 5566 * vertically (possibly by other children of the parent) 5567 */ 5568 protected void measureChildWithMargins(View child, 5569 int parentWidthMeasureSpec, int widthUsed, 5570 int parentHeightMeasureSpec, int heightUsed) { 5571 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 5572 5573 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5574 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 5575 + widthUsed, lp.width); 5576 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5577 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 5578 + heightUsed, lp.height); 5579 5580 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5581 } 5582 5583 /** 5584 * Does the hard part of measureChildren: figuring out the MeasureSpec to 5585 * pass to a particular child. This method figures out the right MeasureSpec 5586 * for one dimension (height or width) of one child view. 5587 * 5588 * The goal is to combine information from our MeasureSpec with the 5589 * LayoutParams of the child to get the best possible results. For example, 5590 * if the this view knows its size (because its MeasureSpec has a mode of 5591 * EXACTLY), and the child has indicated in its LayoutParams that it wants 5592 * to be the same size as the parent, the parent should ask the child to 5593 * layout given an exact size. 5594 * 5595 * @param spec The requirements for this view 5596 * @param padding The padding of this view for the current dimension and 5597 * margins, if applicable 5598 * @param childDimension How big the child wants to be in the current 5599 * dimension 5600 * @return a MeasureSpec integer for the child 5601 */ 5602 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 5603 int specMode = MeasureSpec.getMode(spec); 5604 int specSize = MeasureSpec.getSize(spec); 5605 5606 int size = Math.max(0, specSize - padding); 5607 5608 int resultSize = 0; 5609 int resultMode = 0; 5610 5611 switch (specMode) { 5612 // Parent has imposed an exact size on us 5613 case MeasureSpec.EXACTLY: 5614 if (childDimension >= 0) { 5615 resultSize = childDimension; 5616 resultMode = MeasureSpec.EXACTLY; 5617 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5618 // Child wants to be our size. So be it. 5619 resultSize = size; 5620 resultMode = MeasureSpec.EXACTLY; 5621 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5622 // Child wants to determine its own size. It can't be 5623 // bigger than us. 5624 resultSize = size; 5625 resultMode = MeasureSpec.AT_MOST; 5626 } 5627 break; 5628 5629 // Parent has imposed a maximum size on us 5630 case MeasureSpec.AT_MOST: 5631 if (childDimension >= 0) { 5632 // Child wants a specific size... so be it 5633 resultSize = childDimension; 5634 resultMode = MeasureSpec.EXACTLY; 5635 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5636 // Child wants to be our size, but our size is not fixed. 5637 // Constrain child to not be bigger than us. 5638 resultSize = size; 5639 resultMode = MeasureSpec.AT_MOST; 5640 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5641 // Child wants to determine its own size. It can't be 5642 // bigger than us. 5643 resultSize = size; 5644 resultMode = MeasureSpec.AT_MOST; 5645 } 5646 break; 5647 5648 // Parent asked to see how big we want to be 5649 case MeasureSpec.UNSPECIFIED: 5650 if (childDimension >= 0) { 5651 // Child wants a specific size... let him have it 5652 resultSize = childDimension; 5653 resultMode = MeasureSpec.EXACTLY; 5654 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5655 // Child wants to be our size... find out how big it should 5656 // be 5657 resultSize = 0; 5658 resultMode = MeasureSpec.UNSPECIFIED; 5659 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5660 // Child wants to determine its own size.... find out how 5661 // big it should be 5662 resultSize = 0; 5663 resultMode = MeasureSpec.UNSPECIFIED; 5664 } 5665 break; 5666 } 5667 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 5668 } 5669 5670 5671 /** 5672 * Removes any pending animations for views that have been removed. Call 5673 * this if you don't want animations for exiting views to stack up. 5674 */ 5675 public void clearDisappearingChildren() { 5676 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5677 if (disappearingChildren != null) { 5678 final int count = disappearingChildren.size(); 5679 for (int i = 0; i < count; i++) { 5680 final View view = disappearingChildren.get(i); 5681 if (view.mAttachInfo != null) { 5682 view.dispatchDetachedFromWindow(); 5683 } 5684 view.clearAnimation(); 5685 } 5686 disappearingChildren.clear(); 5687 invalidate(); 5688 } 5689 } 5690 5691 /** 5692 * Add a view which is removed from mChildren but still needs animation 5693 * 5694 * @param v View to add 5695 */ 5696 private void addDisappearingView(View v) { 5697 ArrayList<View> disappearingChildren = mDisappearingChildren; 5698 5699 if (disappearingChildren == null) { 5700 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 5701 } 5702 5703 disappearingChildren.add(v); 5704 } 5705 5706 /** 5707 * Cleanup a view when its animation is done. This may mean removing it from 5708 * the list of disappearing views. 5709 * 5710 * @param view The view whose animation has finished 5711 * @param animation The animation, cannot be null 5712 */ 5713 void finishAnimatingView(final View view, Animation animation) { 5714 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5715 if (disappearingChildren != null) { 5716 if (disappearingChildren.contains(view)) { 5717 disappearingChildren.remove(view); 5718 5719 if (view.mAttachInfo != null) { 5720 view.dispatchDetachedFromWindow(); 5721 } 5722 5723 view.clearAnimation(); 5724 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5725 } 5726 } 5727 5728 if (animation != null && !animation.getFillAfter()) { 5729 view.clearAnimation(); 5730 } 5731 5732 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 5733 view.onAnimationEnd(); 5734 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5735 // so we'd rather be safe than sorry 5736 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 5737 // Draw one more frame after the animation is done 5738 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5739 } 5740 } 5741 5742 /** 5743 * Utility function called by View during invalidation to determine whether a view that 5744 * is invisible or gone should still be invalidated because it is being transitioned (and 5745 * therefore still needs to be drawn). 5746 */ 5747 boolean isViewTransitioning(View view) { 5748 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5749 } 5750 5751 /** 5752 * This method tells the ViewGroup that the given View object, which should have this 5753 * ViewGroup as its parent, 5754 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5755 * is removed from its parent. This allows animations, such as those used by 5756 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5757 * the removal of views. A call to this method should always be accompanied by a later call 5758 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5759 * so that the View finally gets removed. 5760 * 5761 * @param view The View object to be kept visible even if it gets removed from its parent. 5762 */ 5763 public void startViewTransition(View view) { 5764 if (view.mParent == this) { 5765 if (mTransitioningViews == null) { 5766 mTransitioningViews = new ArrayList<View>(); 5767 } 5768 mTransitioningViews.add(view); 5769 } 5770 } 5771 5772 /** 5773 * This method should always be called following an earlier call to 5774 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5775 * and will no longer be displayed. Note that this method does not perform the functionality 5776 * of removing a view from its parent; it just discontinues the display of a View that 5777 * has previously been removed. 5778 * 5779 * @return view The View object that has been removed but is being kept around in the visible 5780 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5781 */ 5782 public void endViewTransition(View view) { 5783 if (mTransitioningViews != null) { 5784 mTransitioningViews.remove(view); 5785 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5786 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5787 disappearingChildren.remove(view); 5788 if (mVisibilityChangingChildren != null && 5789 mVisibilityChangingChildren.contains(view)) { 5790 mVisibilityChangingChildren.remove(view); 5791 } else { 5792 if (view.mAttachInfo != null) { 5793 view.dispatchDetachedFromWindow(); 5794 } 5795 if (view.mParent != null) { 5796 view.mParent = null; 5797 } 5798 } 5799 invalidate(); 5800 } 5801 } 5802 } 5803 5804 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5805 new LayoutTransition.TransitionListener() { 5806 @Override 5807 public void startTransition(LayoutTransition transition, ViewGroup container, 5808 View view, int transitionType) { 5809 // We only care about disappearing items, since we need special logic to keep 5810 // those items visible after they've been 'removed' 5811 if (transitionType == LayoutTransition.DISAPPEARING) { 5812 startViewTransition(view); 5813 } 5814 } 5815 5816 @Override 5817 public void endTransition(LayoutTransition transition, ViewGroup container, 5818 View view, int transitionType) { 5819 if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) { 5820 requestLayout(); 5821 mLayoutCalledWhileSuppressed = false; 5822 } 5823 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5824 endViewTransition(view); 5825 } 5826 } 5827 }; 5828 5829 /** 5830 * Tells this ViewGroup to suppress all layout() calls until layout 5831 * suppression is disabled with a later call to suppressLayout(false). 5832 * When layout suppression is disabled, a requestLayout() call is sent 5833 * if layout() was attempted while layout was being suppressed. 5834 * 5835 * @hide 5836 */ 5837 public void suppressLayout(boolean suppress) { 5838 mSuppressLayout = suppress; 5839 if (!suppress) { 5840 if (mLayoutCalledWhileSuppressed) { 5841 requestLayout(); 5842 mLayoutCalledWhileSuppressed = false; 5843 } 5844 } 5845 } 5846 5847 /** 5848 * Returns whether layout calls on this container are currently being 5849 * suppressed, due to an earlier call to {@link #suppressLayout(boolean)}. 5850 * 5851 * @return true if layout calls are currently suppressed, false otherwise. 5852 * 5853 * @hide 5854 */ 5855 public boolean isLayoutSuppressed() { 5856 return mSuppressLayout; 5857 } 5858 5859 /** 5860 * {@inheritDoc} 5861 */ 5862 @Override 5863 public boolean gatherTransparentRegion(Region region) { 5864 // If no transparent regions requested, we are always opaque. 5865 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 5866 if (meOpaque && region == null) { 5867 // The caller doesn't care about the region, so stop now. 5868 return true; 5869 } 5870 super.gatherTransparentRegion(region); 5871 final View[] children = mChildren; 5872 final int count = mChildrenCount; 5873 boolean noneOfTheChildrenAreTransparent = true; 5874 for (int i = 0; i < count; i++) { 5875 final View child = children[i]; 5876 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5877 if (!child.gatherTransparentRegion(region)) { 5878 noneOfTheChildrenAreTransparent = false; 5879 } 5880 } 5881 } 5882 return meOpaque || noneOfTheChildrenAreTransparent; 5883 } 5884 5885 /** 5886 * {@inheritDoc} 5887 */ 5888 public void requestTransparentRegion(View child) { 5889 if (child != null) { 5890 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 5891 if (mParent != null) { 5892 mParent.requestTransparentRegion(this); 5893 } 5894 } 5895 } 5896 5897 @Override 5898 public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) { 5899 insets = super.dispatchApplyWindowInsets(insets); 5900 if (!insets.isConsumed()) { 5901 final int count = getChildCount(); 5902 for (int i = 0; i < count; i++) { 5903 insets = getChildAt(i).dispatchApplyWindowInsets(insets); 5904 if (insets.isConsumed()) { 5905 break; 5906 } 5907 } 5908 } 5909 return insets; 5910 } 5911 5912 /** 5913 * Returns the animation listener to which layout animation events are 5914 * sent. 5915 * 5916 * @return an {@link android.view.animation.Animation.AnimationListener} 5917 */ 5918 public Animation.AnimationListener getLayoutAnimationListener() { 5919 return mAnimationListener; 5920 } 5921 5922 @Override 5923 protected void drawableStateChanged() { 5924 super.drawableStateChanged(); 5925 5926 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5927 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5928 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5929 + " child has duplicateParentState set to true"); 5930 } 5931 5932 final View[] children = mChildren; 5933 final int count = mChildrenCount; 5934 5935 for (int i = 0; i < count; i++) { 5936 final View child = children[i]; 5937 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5938 child.refreshDrawableState(); 5939 } 5940 } 5941 } 5942 } 5943 5944 @Override 5945 public void jumpDrawablesToCurrentState() { 5946 super.jumpDrawablesToCurrentState(); 5947 final View[] children = mChildren; 5948 final int count = mChildrenCount; 5949 for (int i = 0; i < count; i++) { 5950 children[i].jumpDrawablesToCurrentState(); 5951 } 5952 } 5953 5954 @Override 5955 public void drawableHotspotChanged(float x, float y) { 5956 super.drawableHotspotChanged(x, y); 5957 5958 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5959 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5960 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5961 + " child has duplicateParentState set to true"); 5962 } 5963 5964 final View[] children = mChildren; 5965 final int count = mChildrenCount; 5966 5967 for (int i = 0; i < count; i++) { 5968 final View child = children[i]; 5969 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5970 child.drawableHotspotChanged(x, y); 5971 } 5972 } 5973 } 5974 } 5975 5976 @Override 5977 protected int[] onCreateDrawableState(int extraSpace) { 5978 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5979 return super.onCreateDrawableState(extraSpace); 5980 } 5981 5982 int need = 0; 5983 int n = getChildCount(); 5984 for (int i = 0; i < n; i++) { 5985 int[] childState = getChildAt(i).getDrawableState(); 5986 5987 if (childState != null) { 5988 need += childState.length; 5989 } 5990 } 5991 5992 int[] state = super.onCreateDrawableState(extraSpace + need); 5993 5994 for (int i = 0; i < n; i++) { 5995 int[] childState = getChildAt(i).getDrawableState(); 5996 5997 if (childState != null) { 5998 state = mergeDrawableStates(state, childState); 5999 } 6000 } 6001 6002 return state; 6003 } 6004 6005 /** 6006 * Sets whether this ViewGroup's drawable states also include 6007 * its children's drawable states. This is used, for example, to 6008 * make a group appear to be focused when its child EditText or button 6009 * is focused. 6010 */ 6011 public void setAddStatesFromChildren(boolean addsStates) { 6012 if (addsStates) { 6013 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 6014 } else { 6015 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 6016 } 6017 6018 refreshDrawableState(); 6019 } 6020 6021 /** 6022 * Returns whether this ViewGroup's drawable states also include 6023 * its children's drawable states. This is used, for example, to 6024 * make a group appear to be focused when its child EditText or button 6025 * is focused. 6026 */ 6027 public boolean addStatesFromChildren() { 6028 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 6029 } 6030 6031 /** 6032 * If {@link #addStatesFromChildren} is true, refreshes this group's 6033 * drawable state (to include the states from its children). 6034 */ 6035 public void childDrawableStateChanged(View child) { 6036 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 6037 refreshDrawableState(); 6038 } 6039 } 6040 6041 /** 6042 * Specifies the animation listener to which layout animation events must 6043 * be sent. Only 6044 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 6045 * and 6046 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 6047 * are invoked. 6048 * 6049 * @param animationListener the layout animation listener 6050 */ 6051 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 6052 mAnimationListener = animationListener; 6053 } 6054 6055 /** 6056 * This method is called by LayoutTransition when there are 'changing' animations that need 6057 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 6058 * starts all pending transitions prior to the drawing phase in the current traversal. 6059 * 6060 * @param transition The LayoutTransition to be started on the next traversal. 6061 * 6062 * @hide 6063 */ 6064 public void requestTransitionStart(LayoutTransition transition) { 6065 ViewRootImpl viewAncestor = getViewRootImpl(); 6066 if (viewAncestor != null) { 6067 viewAncestor.requestTransitionStart(transition); 6068 } 6069 } 6070 6071 /** 6072 * @hide 6073 */ 6074 @Override 6075 public boolean resolveRtlPropertiesIfNeeded() { 6076 final boolean result = super.resolveRtlPropertiesIfNeeded(); 6077 // We dont need to resolve the children RTL properties if nothing has changed for the parent 6078 if (result) { 6079 int count = getChildCount(); 6080 for (int i = 0; i < count; i++) { 6081 final View child = getChildAt(i); 6082 if (child.isLayoutDirectionInherited()) { 6083 child.resolveRtlPropertiesIfNeeded(); 6084 } 6085 } 6086 } 6087 return result; 6088 } 6089 6090 /** 6091 * @hide 6092 */ 6093 @Override 6094 public boolean resolveLayoutDirection() { 6095 final boolean result = super.resolveLayoutDirection(); 6096 if (result) { 6097 int count = getChildCount(); 6098 for (int i = 0; i < count; i++) { 6099 final View child = getChildAt(i); 6100 if (child.isLayoutDirectionInherited()) { 6101 child.resolveLayoutDirection(); 6102 } 6103 } 6104 } 6105 return result; 6106 } 6107 6108 /** 6109 * @hide 6110 */ 6111 @Override 6112 public boolean resolveTextDirection() { 6113 final boolean result = super.resolveTextDirection(); 6114 if (result) { 6115 int count = getChildCount(); 6116 for (int i = 0; i < count; i++) { 6117 final View child = getChildAt(i); 6118 if (child.isTextDirectionInherited()) { 6119 child.resolveTextDirection(); 6120 } 6121 } 6122 } 6123 return result; 6124 } 6125 6126 /** 6127 * @hide 6128 */ 6129 @Override 6130 public boolean resolveTextAlignment() { 6131 final boolean result = super.resolveTextAlignment(); 6132 if (result) { 6133 int count = getChildCount(); 6134 for (int i = 0; i < count; i++) { 6135 final View child = getChildAt(i); 6136 if (child.isTextAlignmentInherited()) { 6137 child.resolveTextAlignment(); 6138 } 6139 } 6140 } 6141 return result; 6142 } 6143 6144 /** 6145 * @hide 6146 */ 6147 @Override 6148 public void resolvePadding() { 6149 super.resolvePadding(); 6150 int count = getChildCount(); 6151 for (int i = 0; i < count; i++) { 6152 final View child = getChildAt(i); 6153 if (child.isLayoutDirectionInherited()) { 6154 child.resolvePadding(); 6155 } 6156 } 6157 } 6158 6159 /** 6160 * @hide 6161 */ 6162 @Override 6163 protected void resolveDrawables() { 6164 super.resolveDrawables(); 6165 int count = getChildCount(); 6166 for (int i = 0; i < count; i++) { 6167 final View child = getChildAt(i); 6168 if (child.isLayoutDirectionInherited()) { 6169 child.resolveDrawables(); 6170 } 6171 } 6172 } 6173 6174 /** 6175 * @hide 6176 */ 6177 @Override 6178 public void resolveLayoutParams() { 6179 super.resolveLayoutParams(); 6180 int count = getChildCount(); 6181 for (int i = 0; i < count; i++) { 6182 final View child = getChildAt(i); 6183 child.resolveLayoutParams(); 6184 } 6185 } 6186 6187 /** 6188 * @hide 6189 */ 6190 @Override 6191 public void resetResolvedLayoutDirection() { 6192 super.resetResolvedLayoutDirection(); 6193 6194 int count = getChildCount(); 6195 for (int i = 0; i < count; i++) { 6196 final View child = getChildAt(i); 6197 if (child.isLayoutDirectionInherited()) { 6198 child.resetResolvedLayoutDirection(); 6199 } 6200 } 6201 } 6202 6203 /** 6204 * @hide 6205 */ 6206 @Override 6207 public void resetResolvedTextDirection() { 6208 super.resetResolvedTextDirection(); 6209 6210 int count = getChildCount(); 6211 for (int i = 0; i < count; i++) { 6212 final View child = getChildAt(i); 6213 if (child.isTextDirectionInherited()) { 6214 child.resetResolvedTextDirection(); 6215 } 6216 } 6217 } 6218 6219 /** 6220 * @hide 6221 */ 6222 @Override 6223 public void resetResolvedTextAlignment() { 6224 super.resetResolvedTextAlignment(); 6225 6226 int count = getChildCount(); 6227 for (int i = 0; i < count; i++) { 6228 final View child = getChildAt(i); 6229 if (child.isTextAlignmentInherited()) { 6230 child.resetResolvedTextAlignment(); 6231 } 6232 } 6233 } 6234 6235 /** 6236 * @hide 6237 */ 6238 @Override 6239 public void resetResolvedPadding() { 6240 super.resetResolvedPadding(); 6241 6242 int count = getChildCount(); 6243 for (int i = 0; i < count; i++) { 6244 final View child = getChildAt(i); 6245 if (child.isLayoutDirectionInherited()) { 6246 child.resetResolvedPadding(); 6247 } 6248 } 6249 } 6250 6251 /** 6252 * @hide 6253 */ 6254 @Override 6255 protected void resetResolvedDrawables() { 6256 super.resetResolvedDrawables(); 6257 6258 int count = getChildCount(); 6259 for (int i = 0; i < count; i++) { 6260 final View child = getChildAt(i); 6261 if (child.isLayoutDirectionInherited()) { 6262 child.resetResolvedDrawables(); 6263 } 6264 } 6265 } 6266 6267 /** 6268 * Return true if the pressed state should be delayed for children or descendants of this 6269 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 6270 * This prevents the pressed state from appearing when the user is actually trying to scroll 6271 * the content. 6272 * 6273 * The default implementation returns true for compatibility reasons. Subclasses that do 6274 * not scroll should generally override this method and return false. 6275 */ 6276 public boolean shouldDelayChildPressedState() { 6277 return true; 6278 } 6279 6280 /** 6281 * @inheritDoc 6282 */ 6283 @Override 6284 public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { 6285 return false; 6286 } 6287 6288 /** 6289 * @inheritDoc 6290 */ 6291 @Override 6292 public void onNestedScrollAccepted(View child, View target, int axes) { 6293 mNestedScrollAxes = axes; 6294 } 6295 6296 /** 6297 * @inheritDoc 6298 * 6299 * <p>The default implementation of onStopNestedScroll calls 6300 * {@link #stopNestedScroll()} to halt any recursive nested scrolling in progress.</p> 6301 */ 6302 @Override 6303 public void onStopNestedScroll(View child) { 6304 // Stop any recursive nested scrolling. 6305 stopNestedScroll(); 6306 } 6307 6308 /** 6309 * @inheritDoc 6310 */ 6311 @Override 6312 public void onNestedScroll(View target, int dxConsumed, int dyConsumed, 6313 int dxUnconsumed, int dyUnconsumed) { 6314 // Do nothing 6315 } 6316 6317 /** 6318 * @inheritDoc 6319 */ 6320 @Override 6321 public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) { 6322 // Do nothing 6323 } 6324 6325 /** 6326 * @inheritDoc 6327 */ 6328 @Override 6329 public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) { 6330 return false; 6331 } 6332 6333 /** 6334 * @inheritDoc 6335 */ 6336 @Override 6337 public boolean onNestedPreFling(View target, float velocityX, float velocityY) { 6338 return false; 6339 } 6340 6341 /** 6342 * Return the current axes of nested scrolling for this ViewGroup. 6343 * 6344 * <p>A ViewGroup returning something other than {@link #SCROLL_AXIS_NONE} is currently 6345 * acting as a nested scrolling parent for one or more descendant views in the hierarchy.</p> 6346 * 6347 * @return Flags indicating the current axes of nested scrolling 6348 * @see #SCROLL_AXIS_HORIZONTAL 6349 * @see #SCROLL_AXIS_VERTICAL 6350 * @see #SCROLL_AXIS_NONE 6351 */ 6352 public int getNestedScrollAxes() { 6353 return mNestedScrollAxes; 6354 } 6355 6356 /** @hide */ 6357 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 6358 } 6359 6360 /** @hide */ 6361 @Override 6362 public void captureTransitioningViews(List<View> transitioningViews) { 6363 if (getVisibility() != View.VISIBLE) { 6364 return; 6365 } 6366 if (isTransitionGroup()) { 6367 transitioningViews.add(this); 6368 } else { 6369 int count = getChildCount(); 6370 for (int i = 0; i < count; i++) { 6371 View child = getChildAt(i); 6372 child.captureTransitioningViews(transitioningViews); 6373 } 6374 } 6375 } 6376 6377 /** @hide */ 6378 @Override 6379 public void findNamedViews(Map<String, View> namedElements) { 6380 if (getVisibility() != VISIBLE && mGhostView == null) { 6381 return; 6382 } 6383 super.findNamedViews(namedElements); 6384 int count = getChildCount(); 6385 for (int i = 0; i < count; i++) { 6386 View child = getChildAt(i); 6387 child.findNamedViews(namedElements); 6388 } 6389 } 6390 6391 /** 6392 * LayoutParams are used by views to tell their parents how they want to be 6393 * laid out. See 6394 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 6395 * for a list of all child view attributes that this class supports. 6396 * 6397 * <p> 6398 * The base LayoutParams class just describes how big the view wants to be 6399 * for both width and height. For each dimension, it can specify one of: 6400 * <ul> 6401 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 6402 * means that the view wants to be as big as its parent (minus padding) 6403 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 6404 * to enclose its content (plus padding) 6405 * <li> an exact number 6406 * </ul> 6407 * There are subclasses of LayoutParams for different subclasses of 6408 * ViewGroup. For example, AbsoluteLayout has its own subclass of 6409 * LayoutParams which adds an X and Y value.</p> 6410 * 6411 * <div class="special reference"> 6412 * <h3>Developer Guides</h3> 6413 * <p>For more information about creating user interface layouts, read the 6414 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 6415 * guide.</p></div> 6416 * 6417 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 6418 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 6419 */ 6420 public static class LayoutParams { 6421 /** 6422 * Special value for the height or width requested by a View. 6423 * FILL_PARENT means that the view wants to be as big as its parent, 6424 * minus the parent's padding, if any. This value is deprecated 6425 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 6426 */ 6427 @SuppressWarnings({"UnusedDeclaration"}) 6428 @Deprecated 6429 public static final int FILL_PARENT = -1; 6430 6431 /** 6432 * Special value for the height or width requested by a View. 6433 * MATCH_PARENT means that the view wants to be as big as its parent, 6434 * minus the parent's padding, if any. Introduced in API Level 8. 6435 */ 6436 public static final int MATCH_PARENT = -1; 6437 6438 /** 6439 * Special value for the height or width requested by a View. 6440 * WRAP_CONTENT means that the view wants to be just large enough to fit 6441 * its own internal content, taking its own padding into account. 6442 */ 6443 public static final int WRAP_CONTENT = -2; 6444 6445 /** 6446 * Information about how wide the view wants to be. Can be one of the 6447 * constants FILL_PARENT (replaced by MATCH_PARENT , 6448 * in API Level 8) or WRAP_CONTENT. or an exact size. 6449 */ 6450 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6451 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 6452 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 6453 }) 6454 public int width; 6455 6456 /** 6457 * Information about how tall the view wants to be. Can be one of the 6458 * constants FILL_PARENT (replaced by MATCH_PARENT , 6459 * in API Level 8) or WRAP_CONTENT. or an exact size. 6460 */ 6461 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6462 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 6463 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 6464 }) 6465 public int height; 6466 6467 /** 6468 * Used to animate layouts. 6469 */ 6470 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 6471 6472 /** 6473 * Creates a new set of layout parameters. The values are extracted from 6474 * the supplied attributes set and context. The XML attributes mapped 6475 * to this set of layout parameters are: 6476 * 6477 * <ul> 6478 * <li><code>layout_width</code>: the width, either an exact value, 6479 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 6480 * {@link #MATCH_PARENT} in API Level 8)</li> 6481 * <li><code>layout_height</code>: the height, either an exact value, 6482 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 6483 * {@link #MATCH_PARENT} in API Level 8)</li> 6484 * </ul> 6485 * 6486 * @param c the application environment 6487 * @param attrs the set of attributes from which to extract the layout 6488 * parameters' values 6489 */ 6490 public LayoutParams(Context c, AttributeSet attrs) { 6491 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 6492 setBaseAttributes(a, 6493 R.styleable.ViewGroup_Layout_layout_width, 6494 R.styleable.ViewGroup_Layout_layout_height); 6495 a.recycle(); 6496 } 6497 6498 /** 6499 * Creates a new set of layout parameters with the specified width 6500 * and height. 6501 * 6502 * @param width the width, either {@link #WRAP_CONTENT}, 6503 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 6504 * API Level 8), or a fixed size in pixels 6505 * @param height the height, either {@link #WRAP_CONTENT}, 6506 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 6507 * API Level 8), or a fixed size in pixels 6508 */ 6509 public LayoutParams(int width, int height) { 6510 this.width = width; 6511 this.height = height; 6512 } 6513 6514 /** 6515 * Copy constructor. Clones the width and height values of the source. 6516 * 6517 * @param source The layout params to copy from. 6518 */ 6519 public LayoutParams(LayoutParams source) { 6520 this.width = source.width; 6521 this.height = source.height; 6522 } 6523 6524 /** 6525 * Used internally by MarginLayoutParams. 6526 * @hide 6527 */ 6528 LayoutParams() { 6529 } 6530 6531 /** 6532 * Extracts the layout parameters from the supplied attributes. 6533 * 6534 * @param a the style attributes to extract the parameters from 6535 * @param widthAttr the identifier of the width attribute 6536 * @param heightAttr the identifier of the height attribute 6537 */ 6538 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 6539 width = a.getLayoutDimension(widthAttr, "layout_width"); 6540 height = a.getLayoutDimension(heightAttr, "layout_height"); 6541 } 6542 6543 /** 6544 * Resolve layout parameters depending on the layout direction. Subclasses that care about 6545 * layoutDirection changes should override this method. The default implementation does 6546 * nothing. 6547 * 6548 * @param layoutDirection the direction of the layout 6549 * 6550 * {@link View#LAYOUT_DIRECTION_LTR} 6551 * {@link View#LAYOUT_DIRECTION_RTL} 6552 */ 6553 public void resolveLayoutDirection(int layoutDirection) { 6554 } 6555 6556 /** 6557 * Returns a String representation of this set of layout parameters. 6558 * 6559 * @param output the String to prepend to the internal representation 6560 * @return a String with the following format: output + 6561 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 6562 * 6563 * @hide 6564 */ 6565 public String debug(String output) { 6566 return output + "ViewGroup.LayoutParams={ width=" 6567 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 6568 } 6569 6570 /** 6571 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 6572 * 6573 * @param view the view that contains these layout parameters 6574 * @param canvas the canvas on which to draw 6575 * 6576 * @hide 6577 */ 6578 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6579 } 6580 6581 /** 6582 * Converts the specified size to a readable String. 6583 * 6584 * @param size the size to convert 6585 * @return a String instance representing the supplied size 6586 * 6587 * @hide 6588 */ 6589 protected static String sizeToString(int size) { 6590 if (size == WRAP_CONTENT) { 6591 return "wrap-content"; 6592 } 6593 if (size == MATCH_PARENT) { 6594 return "match-parent"; 6595 } 6596 return String.valueOf(size); 6597 } 6598 } 6599 6600 /** 6601 * Per-child layout information for layouts that support margins. 6602 * See 6603 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 6604 * for a list of all child view attributes that this class supports. 6605 */ 6606 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 6607 /** 6608 * The left margin in pixels of the child. Margin values should be positive. 6609 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6610 * to this field. 6611 */ 6612 @ViewDebug.ExportedProperty(category = "layout") 6613 public int leftMargin; 6614 6615 /** 6616 * The top margin in pixels of the child. Margin values should be positive. 6617 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6618 * to this field. 6619 */ 6620 @ViewDebug.ExportedProperty(category = "layout") 6621 public int topMargin; 6622 6623 /** 6624 * The right margin in pixels of the child. Margin values should be positive. 6625 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6626 * to this field. 6627 */ 6628 @ViewDebug.ExportedProperty(category = "layout") 6629 public int rightMargin; 6630 6631 /** 6632 * The bottom margin in pixels of the child. Margin values should be positive. 6633 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6634 * to this field. 6635 */ 6636 @ViewDebug.ExportedProperty(category = "layout") 6637 public int bottomMargin; 6638 6639 /** 6640 * The start margin in pixels of the child. Margin values should be positive. 6641 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6642 * to this field. 6643 */ 6644 @ViewDebug.ExportedProperty(category = "layout") 6645 private int startMargin = DEFAULT_MARGIN_RELATIVE; 6646 6647 /** 6648 * The end margin in pixels of the child. Margin values should be positive. 6649 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6650 * to this field. 6651 */ 6652 @ViewDebug.ExportedProperty(category = "layout") 6653 private int endMargin = DEFAULT_MARGIN_RELATIVE; 6654 6655 /** 6656 * The default start and end margin. 6657 * @hide 6658 */ 6659 public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE; 6660 6661 /** 6662 * Bit 0: layout direction 6663 * Bit 1: layout direction 6664 * Bit 2: left margin undefined 6665 * Bit 3: right margin undefined 6666 * Bit 4: is RTL compatibility mode 6667 * Bit 5: need resolution 6668 * 6669 * Bit 6 to 7 not used 6670 * 6671 * @hide 6672 */ 6673 @ViewDebug.ExportedProperty(category = "layout", flagMapping = { 6674 @ViewDebug.FlagToString(mask = LAYOUT_DIRECTION_MASK, 6675 equals = LAYOUT_DIRECTION_MASK, name = "LAYOUT_DIRECTION"), 6676 @ViewDebug.FlagToString(mask = LEFT_MARGIN_UNDEFINED_MASK, 6677 equals = LEFT_MARGIN_UNDEFINED_MASK, name = "LEFT_MARGIN_UNDEFINED_MASK"), 6678 @ViewDebug.FlagToString(mask = RIGHT_MARGIN_UNDEFINED_MASK, 6679 equals = RIGHT_MARGIN_UNDEFINED_MASK, name = "RIGHT_MARGIN_UNDEFINED_MASK"), 6680 @ViewDebug.FlagToString(mask = RTL_COMPATIBILITY_MODE_MASK, 6681 equals = RTL_COMPATIBILITY_MODE_MASK, name = "RTL_COMPATIBILITY_MODE_MASK"), 6682 @ViewDebug.FlagToString(mask = NEED_RESOLUTION_MASK, 6683 equals = NEED_RESOLUTION_MASK, name = "NEED_RESOLUTION_MASK") 6684 }, formatToHexString = true) 6685 byte mMarginFlags; 6686 6687 private static final int LAYOUT_DIRECTION_MASK = 0x00000003; 6688 private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004; 6689 private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008; 6690 private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010; 6691 private static final int NEED_RESOLUTION_MASK = 0x00000020; 6692 6693 private static final int DEFAULT_MARGIN_RESOLVED = 0; 6694 private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE; 6695 6696 /** 6697 * Creates a new set of layout parameters. The values are extracted from 6698 * the supplied attributes set and context. 6699 * 6700 * @param c the application environment 6701 * @param attrs the set of attributes from which to extract the layout 6702 * parameters' values 6703 */ 6704 public MarginLayoutParams(Context c, AttributeSet attrs) { 6705 super(); 6706 6707 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 6708 setBaseAttributes(a, 6709 R.styleable.ViewGroup_MarginLayout_layout_width, 6710 R.styleable.ViewGroup_MarginLayout_layout_height); 6711 6712 int margin = a.getDimensionPixelSize( 6713 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 6714 if (margin >= 0) { 6715 leftMargin = margin; 6716 topMargin = margin; 6717 rightMargin= margin; 6718 bottomMargin = margin; 6719 } else { 6720 leftMargin = a.getDimensionPixelSize( 6721 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 6722 UNDEFINED_MARGIN); 6723 if (leftMargin == UNDEFINED_MARGIN) { 6724 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6725 leftMargin = DEFAULT_MARGIN_RESOLVED; 6726 } 6727 rightMargin = a.getDimensionPixelSize( 6728 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 6729 UNDEFINED_MARGIN); 6730 if (rightMargin == UNDEFINED_MARGIN) { 6731 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6732 rightMargin = DEFAULT_MARGIN_RESOLVED; 6733 } 6734 6735 topMargin = a.getDimensionPixelSize( 6736 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 6737 DEFAULT_MARGIN_RESOLVED); 6738 bottomMargin = a.getDimensionPixelSize( 6739 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 6740 DEFAULT_MARGIN_RESOLVED); 6741 6742 startMargin = a.getDimensionPixelSize( 6743 R.styleable.ViewGroup_MarginLayout_layout_marginStart, 6744 DEFAULT_MARGIN_RELATIVE); 6745 endMargin = a.getDimensionPixelSize( 6746 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, 6747 DEFAULT_MARGIN_RELATIVE); 6748 6749 if (isMarginRelative()) { 6750 mMarginFlags |= NEED_RESOLUTION_MASK; 6751 } 6752 } 6753 6754 final boolean hasRtlSupport = c.getApplicationInfo().hasRtlSupport(); 6755 final int targetSdkVersion = c.getApplicationInfo().targetSdkVersion; 6756 if (targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport) { 6757 mMarginFlags |= RTL_COMPATIBILITY_MODE_MASK; 6758 } 6759 6760 // Layout direction is LTR by default 6761 mMarginFlags |= LAYOUT_DIRECTION_LTR; 6762 6763 a.recycle(); 6764 } 6765 6766 /** 6767 * {@inheritDoc} 6768 */ 6769 public MarginLayoutParams(int width, int height) { 6770 super(width, height); 6771 6772 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6773 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6774 6775 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6776 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6777 } 6778 6779 /** 6780 * Copy constructor. Clones the width, height and margin values of the source. 6781 * 6782 * @param source The layout params to copy from. 6783 */ 6784 public MarginLayoutParams(MarginLayoutParams source) { 6785 this.width = source.width; 6786 this.height = source.height; 6787 6788 this.leftMargin = source.leftMargin; 6789 this.topMargin = source.topMargin; 6790 this.rightMargin = source.rightMargin; 6791 this.bottomMargin = source.bottomMargin; 6792 this.startMargin = source.startMargin; 6793 this.endMargin = source.endMargin; 6794 6795 this.mMarginFlags = source.mMarginFlags; 6796 } 6797 6798 /** 6799 * {@inheritDoc} 6800 */ 6801 public MarginLayoutParams(LayoutParams source) { 6802 super(source); 6803 6804 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6805 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6806 6807 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6808 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6809 } 6810 6811 /** 6812 * @hide Used internally. 6813 */ 6814 public final void copyMarginsFrom(MarginLayoutParams source) { 6815 this.leftMargin = source.leftMargin; 6816 this.topMargin = source.topMargin; 6817 this.rightMargin = source.rightMargin; 6818 this.bottomMargin = source.bottomMargin; 6819 this.startMargin = source.startMargin; 6820 this.endMargin = source.endMargin; 6821 6822 this.mMarginFlags = source.mMarginFlags; 6823 } 6824 6825 /** 6826 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 6827 * to be done so that the new margins are taken into account. Left and right margins may be 6828 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 6829 * Margin values should be positive. 6830 * 6831 * @param left the left margin size 6832 * @param top the top margin size 6833 * @param right the right margin size 6834 * @param bottom the bottom margin size 6835 * 6836 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 6837 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6838 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 6839 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6840 */ 6841 public void setMargins(int left, int top, int right, int bottom) { 6842 leftMargin = left; 6843 topMargin = top; 6844 rightMargin = right; 6845 bottomMargin = bottom; 6846 mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK; 6847 mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK; 6848 if (isMarginRelative()) { 6849 mMarginFlags |= NEED_RESOLUTION_MASK; 6850 } else { 6851 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6852 } 6853 } 6854 6855 /** 6856 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 6857 * needs to be done so that the new relative margins are taken into account. Left and right 6858 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 6859 * direction. Margin values should be positive. 6860 * 6861 * @param start the start margin size 6862 * @param top the top margin size 6863 * @param end the right margin size 6864 * @param bottom the bottom margin size 6865 * 6866 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6867 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6868 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6869 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6870 * 6871 * @hide 6872 */ 6873 public void setMarginsRelative(int start, int top, int end, int bottom) { 6874 startMargin = start; 6875 topMargin = top; 6876 endMargin = end; 6877 bottomMargin = bottom; 6878 mMarginFlags |= NEED_RESOLUTION_MASK; 6879 } 6880 6881 /** 6882 * Sets the relative start margin. Margin values should be positive. 6883 * 6884 * @param start the start margin size 6885 * 6886 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6887 */ 6888 public void setMarginStart(int start) { 6889 startMargin = start; 6890 mMarginFlags |= NEED_RESOLUTION_MASK; 6891 } 6892 6893 /** 6894 * Returns the start margin in pixels. 6895 * 6896 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6897 * 6898 * @return the start margin in pixels. 6899 */ 6900 public int getMarginStart() { 6901 if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin; 6902 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6903 doResolveMargins(); 6904 } 6905 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6906 case View.LAYOUT_DIRECTION_RTL: 6907 return rightMargin; 6908 case View.LAYOUT_DIRECTION_LTR: 6909 default: 6910 return leftMargin; 6911 } 6912 } 6913 6914 /** 6915 * Sets the relative end margin. Margin values should be positive. 6916 * 6917 * @param end the end margin size 6918 * 6919 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6920 */ 6921 public void setMarginEnd(int end) { 6922 endMargin = end; 6923 mMarginFlags |= NEED_RESOLUTION_MASK; 6924 } 6925 6926 /** 6927 * Returns the end margin in pixels. 6928 * 6929 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6930 * 6931 * @return the end margin in pixels. 6932 */ 6933 public int getMarginEnd() { 6934 if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin; 6935 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6936 doResolveMargins(); 6937 } 6938 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6939 case View.LAYOUT_DIRECTION_RTL: 6940 return leftMargin; 6941 case View.LAYOUT_DIRECTION_LTR: 6942 default: 6943 return rightMargin; 6944 } 6945 } 6946 6947 /** 6948 * Check if margins are relative. 6949 * 6950 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6951 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6952 * 6953 * @return true if either marginStart or marginEnd has been set. 6954 */ 6955 public boolean isMarginRelative() { 6956 return (startMargin != DEFAULT_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE); 6957 } 6958 6959 /** 6960 * Set the layout direction 6961 * @param layoutDirection the layout direction. 6962 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 6963 * or {@link View#LAYOUT_DIRECTION_RTL}. 6964 */ 6965 public void setLayoutDirection(int layoutDirection) { 6966 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 6967 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 6968 if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) { 6969 mMarginFlags &= ~LAYOUT_DIRECTION_MASK; 6970 mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK); 6971 if (isMarginRelative()) { 6972 mMarginFlags |= NEED_RESOLUTION_MASK; 6973 } else { 6974 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6975 } 6976 } 6977 } 6978 6979 /** 6980 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 6981 * {@link View#LAYOUT_DIRECTION_RTL}. 6982 * 6983 * @return the layout direction. 6984 */ 6985 public int getLayoutDirection() { 6986 return (mMarginFlags & LAYOUT_DIRECTION_MASK); 6987 } 6988 6989 /** 6990 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 6991 * may be overridden depending on layout direction. 6992 */ 6993 @Override 6994 public void resolveLayoutDirection(int layoutDirection) { 6995 setLayoutDirection(layoutDirection); 6996 6997 // No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything 6998 // Will use the left and right margins if no relative margin is defined. 6999 if (!isMarginRelative() || 7000 (mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return; 7001 7002 // Proceed with resolution 7003 doResolveMargins(); 7004 } 7005 7006 private void doResolveMargins() { 7007 if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) { 7008 // if left or right margins are not defined and if we have some start or end margin 7009 // defined then use those start and end margins. 7010 if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK 7011 && startMargin > DEFAULT_MARGIN_RELATIVE) { 7012 leftMargin = startMargin; 7013 } 7014 if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK 7015 && endMargin > DEFAULT_MARGIN_RELATIVE) { 7016 rightMargin = endMargin; 7017 } 7018 } else { 7019 // We have some relative margins (either the start one or the end one or both). So use 7020 // them and override what has been defined for left and right margins. If either start 7021 // or end margin is not defined, just set it to default "0". 7022 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 7023 case View.LAYOUT_DIRECTION_RTL: 7024 leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 7025 endMargin : DEFAULT_MARGIN_RESOLVED; 7026 rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 7027 startMargin : DEFAULT_MARGIN_RESOLVED; 7028 break; 7029 case View.LAYOUT_DIRECTION_LTR: 7030 default: 7031 leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 7032 startMargin : DEFAULT_MARGIN_RESOLVED; 7033 rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 7034 endMargin : DEFAULT_MARGIN_RESOLVED; 7035 break; 7036 } 7037 } 7038 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7039 } 7040 7041 /** 7042 * @hide 7043 */ 7044 public boolean isLayoutRtl() { 7045 return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL); 7046 } 7047 7048 /** 7049 * @hide 7050 */ 7051 @Override 7052 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 7053 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 7054 7055 fillDifference(canvas, 7056 view.getLeft() + oi.left, 7057 view.getTop() + oi.top, 7058 view.getRight() - oi.right, 7059 view.getBottom() - oi.bottom, 7060 leftMargin, 7061 topMargin, 7062 rightMargin, 7063 bottomMargin, 7064 paint); 7065 } 7066 } 7067 7068 /* Describes a touched view and the ids of the pointers that it has captured. 7069 * 7070 * This code assumes that pointer ids are always in the range 0..31 such that 7071 * it can use a bitfield to track which pointer ids are present. 7072 * As it happens, the lower layers of the input dispatch pipeline also use the 7073 * same trick so the assumption should be safe here... 7074 */ 7075 private static final class TouchTarget { 7076 private static final int MAX_RECYCLED = 32; 7077 private static final Object sRecycleLock = new Object[0]; 7078 private static TouchTarget sRecycleBin; 7079 private static int sRecycledCount; 7080 7081 public static final int ALL_POINTER_IDS = -1; // all ones 7082 7083 // The touched child view. 7084 public View child; 7085 7086 // The combined bit mask of pointer ids for all pointers captured by the target. 7087 public int pointerIdBits; 7088 7089 // The next target in the target list. 7090 public TouchTarget next; 7091 7092 private TouchTarget() { 7093 } 7094 7095 public static TouchTarget obtain(View child, int pointerIdBits) { 7096 final TouchTarget target; 7097 synchronized (sRecycleLock) { 7098 if (sRecycleBin == null) { 7099 target = new TouchTarget(); 7100 } else { 7101 target = sRecycleBin; 7102 sRecycleBin = target.next; 7103 sRecycledCount--; 7104 target.next = null; 7105 } 7106 } 7107 target.child = child; 7108 target.pointerIdBits = pointerIdBits; 7109 return target; 7110 } 7111 7112 public void recycle() { 7113 synchronized (sRecycleLock) { 7114 if (sRecycledCount < MAX_RECYCLED) { 7115 next = sRecycleBin; 7116 sRecycleBin = this; 7117 sRecycledCount += 1; 7118 } else { 7119 next = null; 7120 } 7121 child = null; 7122 } 7123 } 7124 } 7125 7126 /* Describes a hovered view. */ 7127 private static final class HoverTarget { 7128 private static final int MAX_RECYCLED = 32; 7129 private static final Object sRecycleLock = new Object[0]; 7130 private static HoverTarget sRecycleBin; 7131 private static int sRecycledCount; 7132 7133 // The hovered child view. 7134 public View child; 7135 7136 // The next target in the target list. 7137 public HoverTarget next; 7138 7139 private HoverTarget() { 7140 } 7141 7142 public static HoverTarget obtain(View child) { 7143 final HoverTarget target; 7144 synchronized (sRecycleLock) { 7145 if (sRecycleBin == null) { 7146 target = new HoverTarget(); 7147 } else { 7148 target = sRecycleBin; 7149 sRecycleBin = target.next; 7150 sRecycledCount--; 7151 target.next = null; 7152 } 7153 } 7154 target.child = child; 7155 return target; 7156 } 7157 7158 public void recycle() { 7159 synchronized (sRecycleLock) { 7160 if (sRecycledCount < MAX_RECYCLED) { 7161 next = sRecycleBin; 7162 sRecycleBin = this; 7163 sRecycledCount += 1; 7164 } else { 7165 next = null; 7166 } 7167 child = null; 7168 } 7169 } 7170 } 7171 7172 /** 7173 * Pooled class that orderes the children of a ViewGroup from start 7174 * to end based on how they are laid out and the layout direction. 7175 */ 7176 static class ChildListForAccessibility { 7177 7178 private static final int MAX_POOL_SIZE = 32; 7179 7180 private static final SynchronizedPool<ChildListForAccessibility> sPool = 7181 new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE); 7182 7183 private final ArrayList<View> mChildren = new ArrayList<View>(); 7184 7185 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 7186 7187 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 7188 ChildListForAccessibility list = sPool.acquire(); 7189 if (list == null) { 7190 list = new ChildListForAccessibility(); 7191 } 7192 list.init(parent, sort); 7193 return list; 7194 } 7195 7196 public void recycle() { 7197 clear(); 7198 sPool.release(this); 7199 } 7200 7201 public int getChildCount() { 7202 return mChildren.size(); 7203 } 7204 7205 public View getChildAt(int index) { 7206 return mChildren.get(index); 7207 } 7208 7209 public int getChildIndex(View child) { 7210 return mChildren.indexOf(child); 7211 } 7212 7213 private void init(ViewGroup parent, boolean sort) { 7214 ArrayList<View> children = mChildren; 7215 final int childCount = parent.getChildCount(); 7216 for (int i = 0; i < childCount; i++) { 7217 View child = parent.getChildAt(i); 7218 children.add(child); 7219 } 7220 if (sort) { 7221 ArrayList<ViewLocationHolder> holders = mHolders; 7222 for (int i = 0; i < childCount; i++) { 7223 View child = children.get(i); 7224 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 7225 holders.add(holder); 7226 } 7227 sort(holders); 7228 for (int i = 0; i < childCount; i++) { 7229 ViewLocationHolder holder = holders.get(i); 7230 children.set(i, holder.mView); 7231 holder.recycle(); 7232 } 7233 holders.clear(); 7234 } 7235 } 7236 7237 private void sort(ArrayList<ViewLocationHolder> holders) { 7238 // This is gross but the least risky solution. The current comparison 7239 // strategy breaks transitivity but produces very good results. Coming 7240 // up with a new strategy requires time which we do not have, so ... 7241 try { 7242 ViewLocationHolder.setComparisonStrategy( 7243 ViewLocationHolder.COMPARISON_STRATEGY_STRIPE); 7244 Collections.sort(holders); 7245 } catch (IllegalArgumentException iae) { 7246 // Note that in practice this occurs extremely rarely in a couple 7247 // of pathological cases. 7248 ViewLocationHolder.setComparisonStrategy( 7249 ViewLocationHolder.COMPARISON_STRATEGY_LOCATION); 7250 Collections.sort(holders); 7251 } 7252 } 7253 7254 private void clear() { 7255 mChildren.clear(); 7256 } 7257 } 7258 7259 /** 7260 * Pooled class that holds a View and its location with respect to 7261 * a specified root. This enables sorting of views based on their 7262 * coordinates without recomputing the position relative to the root 7263 * on every comparison. 7264 */ 7265 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 7266 7267 private static final int MAX_POOL_SIZE = 32; 7268 7269 private static final SynchronizedPool<ViewLocationHolder> sPool = 7270 new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE); 7271 7272 public static final int COMPARISON_STRATEGY_STRIPE = 1; 7273 7274 public static final int COMPARISON_STRATEGY_LOCATION = 2; 7275 7276 private static int sComparisonStrategy = COMPARISON_STRATEGY_STRIPE; 7277 7278 private final Rect mLocation = new Rect(); 7279 7280 public View mView; 7281 7282 private int mLayoutDirection; 7283 7284 public static ViewLocationHolder obtain(ViewGroup root, View view) { 7285 ViewLocationHolder holder = sPool.acquire(); 7286 if (holder == null) { 7287 holder = new ViewLocationHolder(); 7288 } 7289 holder.init(root, view); 7290 return holder; 7291 } 7292 7293 public static void setComparisonStrategy(int strategy) { 7294 sComparisonStrategy = strategy; 7295 } 7296 7297 public void recycle() { 7298 clear(); 7299 sPool.release(this); 7300 } 7301 7302 @Override 7303 public int compareTo(ViewLocationHolder another) { 7304 // This instance is greater than an invalid argument. 7305 if (another == null) { 7306 return 1; 7307 } 7308 7309 if (sComparisonStrategy == COMPARISON_STRATEGY_STRIPE) { 7310 // First is above second. 7311 if (mLocation.bottom - another.mLocation.top <= 0) { 7312 return -1; 7313 } 7314 // First is below second. 7315 if (mLocation.top - another.mLocation.bottom >= 0) { 7316 return 1; 7317 } 7318 } 7319 7320 // We are ordering left-to-right, top-to-bottom. 7321 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 7322 final int leftDifference = mLocation.left - another.mLocation.left; 7323 if (leftDifference != 0) { 7324 return leftDifference; 7325 } 7326 } else { // RTL 7327 final int rightDifference = mLocation.right - another.mLocation.right; 7328 if (rightDifference != 0) { 7329 return -rightDifference; 7330 } 7331 } 7332 // We are ordering left-to-right, top-to-bottom. 7333 final int topDifference = mLocation.top - another.mLocation.top; 7334 if (topDifference != 0) { 7335 return topDifference; 7336 } 7337 // Break tie by height. 7338 final int heightDiference = mLocation.height() - another.mLocation.height(); 7339 if (heightDiference != 0) { 7340 return -heightDiference; 7341 } 7342 // Break tie by width. 7343 final int widthDiference = mLocation.width() - another.mLocation.width(); 7344 if (widthDiference != 0) { 7345 return -widthDiference; 7346 } 7347 // Just break the tie somehow. The accessibliity ids are unique 7348 // and stable, hence this is deterministic tie breaking. 7349 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 7350 } 7351 7352 private void init(ViewGroup root, View view) { 7353 Rect viewLocation = mLocation; 7354 view.getDrawingRect(viewLocation); 7355 root.offsetDescendantRectToMyCoords(view, viewLocation); 7356 mView = view; 7357 mLayoutDirection = root.getLayoutDirection(); 7358 } 7359 7360 private void clear() { 7361 mView = null; 7362 mLocation.set(0, 0, 0, 0); 7363 } 7364 } 7365 7366 private static Paint getDebugPaint() { 7367 if (sDebugPaint == null) { 7368 sDebugPaint = new Paint(); 7369 sDebugPaint.setAntiAlias(false); 7370 } 7371 return sDebugPaint; 7372 } 7373 7374 private static void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 7375 if (sDebugLines== null) { 7376 // TODO: This won't work with multiple UI threads in a single process 7377 sDebugLines = new float[16]; 7378 } 7379 7380 sDebugLines[0] = x1; 7381 sDebugLines[1] = y1; 7382 sDebugLines[2] = x2; 7383 sDebugLines[3] = y1; 7384 7385 sDebugLines[4] = x2; 7386 sDebugLines[5] = y1; 7387 sDebugLines[6] = x2; 7388 sDebugLines[7] = y2; 7389 7390 sDebugLines[8] = x2; 7391 sDebugLines[9] = y2; 7392 sDebugLines[10] = x1; 7393 sDebugLines[11] = y2; 7394 7395 sDebugLines[12] = x1; 7396 sDebugLines[13] = y2; 7397 sDebugLines[14] = x1; 7398 sDebugLines[15] = y1; 7399 7400 canvas.drawLines(sDebugLines, paint); 7401 } 7402 7403 private final class OrderedChildIterator implements Iterator<View> { 7404 private List<View> mOrderedChildList; 7405 private boolean mUseCustomOrder; 7406 private int mCurrentIndex; 7407 private boolean mInitialized; 7408 7409 public void initialize() { 7410 mOrderedChildList = buildOrderedChildList(); 7411 mUseCustomOrder = (mOrderedChildList == null) 7412 && isChildrenDrawingOrderEnabled(); 7413 mCurrentIndex = mChildrenCount - 1; 7414 mInitialized = true; 7415 } 7416 7417 public void release() { 7418 if (mOrderedChildList != null) { 7419 mOrderedChildList.clear(); 7420 } 7421 mUseCustomOrder = false; 7422 mCurrentIndex = 0; 7423 mInitialized = false; 7424 } 7425 7426 public boolean isInitialized() { 7427 return mInitialized; 7428 } 7429 7430 @Override 7431 public boolean hasNext() { 7432 return (mCurrentIndex >= 0); 7433 } 7434 7435 @Override 7436 public View next() { 7437 if (!hasNext()) { 7438 throw new NoSuchElementException("No such element"); 7439 } 7440 return getChild(mCurrentIndex--); 7441 } 7442 7443 private View getChild(int index) { 7444 final int childIndex = mUseCustomOrder 7445 ? getChildDrawingOrder(mChildrenCount, index) : index; 7446 return (mOrderedChildList == null) 7447 ? mChildren[childIndex] : mOrderedChildList.get(childIndex); 7448 } 7449 7450 @Override 7451 public void remove() { 7452 throw new UnsupportedOperationException(); 7453 } 7454 } 7455} 7456