ViewGroup.java revision b6ab098bad4b126eaaaa3aaa5a512fefc4e0749b
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.Bundle; 36import android.os.Parcelable; 37import android.os.SystemClock; 38import android.util.AttributeSet; 39import android.util.Log; 40import android.util.Pools.SynchronizedPool; 41import android.util.SparseArray; 42import android.view.accessibility.AccessibilityEvent; 43import android.view.accessibility.AccessibilityNodeInfo; 44import android.view.animation.Animation; 45import android.view.animation.AnimationUtils; 46import android.view.animation.LayoutAnimationController; 47import android.view.animation.Transformation; 48 49import com.android.internal.R; 50import com.android.internal.util.Predicate; 51 52import java.util.ArrayList; 53import java.util.Collections; 54import java.util.HashSet; 55import java.util.Iterator; 56import java.util.List; 57import java.util.Map; 58import java.util.NoSuchElementException; 59 60import static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1; 61 62/** 63 * <p> 64 * A <code>ViewGroup</code> is a special view that can contain other views 65 * (called children.) The view group is the base class for layouts and views 66 * containers. This class also defines the 67 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 68 * class for layouts parameters. 69 * </p> 70 * 71 * <p> 72 * Also see {@link LayoutParams} for layout attributes. 73 * </p> 74 * 75 * <div class="special reference"> 76 * <h3>Developer Guides</h3> 77 * <p>For more information about creating user interface layouts, read the 78 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 79 * guide.</p></div> 80 * 81 * <p>Here is a complete implementation of a custom ViewGroup that implements 82 * a simple {@link android.widget.FrameLayout} along with the ability to stack 83 * children in left and right gutters.</p> 84 * 85 * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/CustomLayout.java 86 * Complete} 87 * 88 * <p>If you are implementing XML layout attributes as shown in the example, this is the 89 * corresponding definition for them that would go in <code>res/values/attrs.xml</code>:</p> 90 * 91 * {@sample development/samples/ApiDemos/res/values/attrs.xml CustomLayout} 92 * 93 * <p>Finally the layout manager can be used in an XML layout like so:</p> 94 * 95 * {@sample development/samples/ApiDemos/res/layout/custom_layout.xml Complete} 96 * 97 * @attr ref android.R.styleable#ViewGroup_clipChildren 98 * @attr ref android.R.styleable#ViewGroup_clipToPadding 99 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 100 * @attr ref android.R.styleable#ViewGroup_animationCache 101 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 102 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 103 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 104 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 105 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 106 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 107 * @attr ref android.R.styleable#ViewGroup_layoutMode 108 */ 109public abstract class ViewGroup extends View implements ViewParent, ViewManager { 110 private static final String TAG = "ViewGroup"; 111 112 private static final boolean DBG = false; 113 /** @hide */ 114 public static boolean DEBUG_DRAW = false; 115 116 /** 117 * Views which have been hidden or removed which need to be animated on 118 * their way out. 119 * This field should be made private, so it is hidden from the SDK. 120 * {@hide} 121 */ 122 protected ArrayList<View> mDisappearingChildren; 123 124 /** 125 * Listener used to propagate events indicating when children are added 126 * and/or removed from a view group. 127 * This field should be made private, so it is hidden from the SDK. 128 * {@hide} 129 */ 130 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 131 132 // The view contained within this ViewGroup that has or contains focus. 133 private View mFocused; 134 135 /** 136 * A Transformation used when drawing children, to 137 * apply on the child being drawn. 138 */ 139 private Transformation mChildTransformation; 140 141 /** 142 * Used to track the current invalidation region. 143 */ 144 RectF mInvalidateRegion; 145 146 /** 147 * A Transformation used to calculate a correct 148 * invalidation area when the application is autoscaled. 149 */ 150 Transformation mInvalidationTransformation; 151 152 // View currently under an ongoing drag 153 private View mCurrentDragView; 154 155 // Metadata about the ongoing drag 156 private DragEvent mCurrentDrag; 157 private HashSet<View> mDragNotifiedChildren; 158 159 // Does this group have a child that can accept the current drag payload? 160 private boolean mChildAcceptsDrag; 161 162 // Used during drag dispatch 163 private PointF mLocalPoint; 164 165 // Lazily-created holder for point computations. 166 private float[] mTempPoint; 167 168 // Layout animation 169 private LayoutAnimationController mLayoutAnimationController; 170 private Animation.AnimationListener mAnimationListener; 171 172 // First touch target in the linked list of touch targets. 173 private TouchTarget mFirstTouchTarget; 174 175 // For debugging only. You can see these in hierarchyviewer. 176 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 177 @ViewDebug.ExportedProperty(category = "events") 178 private long mLastTouchDownTime; 179 @ViewDebug.ExportedProperty(category = "events") 180 private int mLastTouchDownIndex = -1; 181 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 182 @ViewDebug.ExportedProperty(category = "events") 183 private float mLastTouchDownX; 184 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 185 @ViewDebug.ExportedProperty(category = "events") 186 private float mLastTouchDownY; 187 188 // First hover target in the linked list of hover targets. 189 // The hover targets are children which have received ACTION_HOVER_ENTER. 190 // They might not have actually handled the hover event, but we will 191 // continue sending hover events to them as long as the pointer remains over 192 // their bounds and the view group does not intercept hover. 193 private HoverTarget mFirstHoverTarget; 194 195 // True if the view group itself received a hover event. 196 // It might not have actually handled the hover event. 197 private boolean mHoveredSelf; 198 199 /** 200 * Internal flags. 201 * 202 * This field should be made private, so it is hidden from the SDK. 203 * {@hide} 204 */ 205 @ViewDebug.ExportedProperty(flagMapping = { 206 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 207 name = "CLIP_CHILDREN"), 208 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 209 name = "CLIP_TO_PADDING"), 210 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 211 name = "PADDING_NOT_NULL") 212 }, formatToHexString = true) 213 protected int mGroupFlags; 214 215 /** 216 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 217 */ 218 private int mLayoutMode = LAYOUT_MODE_UNDEFINED; 219 220 /** 221 * NOTE: If you change the flags below make sure to reflect the changes 222 * the DisplayList class 223 */ 224 225 // When set, ViewGroup invalidates only the child's rectangle 226 // Set by default 227 static final int FLAG_CLIP_CHILDREN = 0x1; 228 229 // When set, ViewGroup excludes the padding area from the invalidate rectangle 230 // Set by default 231 private static final int FLAG_CLIP_TO_PADDING = 0x2; 232 233 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 234 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 235 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 236 237 // When set, dispatchDraw() will run the layout animation and unset the flag 238 private static final int FLAG_RUN_ANIMATION = 0x8; 239 240 // When set, there is either no layout animation on the ViewGroup or the layout 241 // animation is over 242 // Set by default 243 static final int FLAG_ANIMATION_DONE = 0x10; 244 245 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 246 // to clip it, even if FLAG_CLIP_TO_PADDING is set 247 private static final int FLAG_PADDING_NOT_NULL = 0x20; 248 249 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 250 // Set by default 251 private static final int FLAG_ANIMATION_CACHE = 0x40; 252 253 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 254 // layout animation; this avoid clobbering the hierarchy 255 // Automatically set when the layout animation starts, depending on the animation's 256 // characteristics 257 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 258 259 // When set, the next call to drawChild() will clear mChildTransformation's matrix 260 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 261 262 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 263 // the children's Bitmap caches if necessary 264 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 265 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 266 267 /** 268 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 269 * to get the index of the child to draw for that iteration. 270 * 271 * @hide 272 */ 273 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 274 275 /** 276 * When set, this ViewGroup supports static transformations on children; this causes 277 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 278 * invoked when a child is drawn. 279 * 280 * Any subclass overriding 281 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 282 * set this flags in {@link #mGroupFlags}. 283 * 284 * {@hide} 285 */ 286 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 287 288 // UNUSED FLAG VALUE: 0x1000; 289 290 /** 291 * When set, this ViewGroup's drawable states also include those 292 * of its children. 293 */ 294 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 295 296 /** 297 * When set, this ViewGroup tries to always draw its children using their drawing cache. 298 */ 299 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 300 301 /** 302 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 303 * draw its children with their drawing cache. 304 */ 305 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 306 307 /** 308 * When set, this group will go through its list of children to notify them of 309 * any drawable state change. 310 */ 311 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 312 313 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 314 315 /** 316 * This view will get focus before any of its descendants. 317 */ 318 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 319 320 /** 321 * This view will get focus only if none of its descendants want it. 322 */ 323 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 324 325 /** 326 * This view will block any of its descendants from getting focus, even 327 * if they are focusable. 328 */ 329 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 330 331 /** 332 * Used to map between enum in attrubutes and flag values. 333 */ 334 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 335 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 336 FOCUS_BLOCK_DESCENDANTS}; 337 338 /** 339 * When set, this ViewGroup should not intercept touch events. 340 * {@hide} 341 */ 342 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 343 344 /** 345 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 346 */ 347 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 348 349 /** 350 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 351 * to children when adding new views. This is used to prevent multiple 352 * onAttached calls when a ViewGroup adds children in its own onAttached method. 353 */ 354 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 355 356 /** 357 * When true, indicates that a layoutMode has been explicitly set, either with 358 * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. 359 * This distinguishes the situation in which a layout mode was inherited from 360 * one of the ViewGroup's ancestors and cached locally. 361 */ 362 private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; 363 364 static final int FLAG_IS_TRANSITION_GROUP = 0x1000000; 365 366 static final int FLAG_IS_TRANSITION_GROUP_SET = 0x2000000; 367 368 /** 369 * When set, focus will not be permitted to enter this group if a touchscreen is present. 370 */ 371 static final int FLAG_TOUCHSCREEN_BLOCKS_FOCUS = 0x4000000; 372 373 /** 374 * Indicates which types of drawing caches are to be kept in memory. 375 * This field should be made private, so it is hidden from the SDK. 376 * {@hide} 377 */ 378 protected int mPersistentDrawingCache; 379 380 /** 381 * Used to indicate that no drawing cache should be kept in memory. 382 */ 383 public static final int PERSISTENT_NO_CACHE = 0x0; 384 385 /** 386 * Used to indicate that the animation drawing cache should be kept in memory. 387 */ 388 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 389 390 /** 391 * Used to indicate that the scrolling drawing cache should be kept in memory. 392 */ 393 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 394 395 /** 396 * Used to indicate that all drawing caches should be kept in memory. 397 */ 398 public static final int PERSISTENT_ALL_CACHES = 0x3; 399 400 // Layout Modes 401 402 private static final int LAYOUT_MODE_UNDEFINED = -1; 403 404 /** 405 * This constant is a {@link #setLayoutMode(int) layoutMode}. 406 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 407 * {@link #getRight() right} and {@link #getBottom() bottom}. 408 */ 409 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 410 411 /** 412 * This constant is a {@link #setLayoutMode(int) layoutMode}. 413 * Optical bounds describe where a widget appears to be. They sit inside the clip 414 * bounds which need to cover a larger area to allow other effects, 415 * such as shadows and glows, to be drawn. 416 */ 417 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 418 419 /** @hide */ 420 public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; 421 422 /** 423 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 424 * are set at the same time. 425 */ 426 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 427 428 // Index of the child's left position in the mLocation array 429 private static final int CHILD_LEFT_INDEX = 0; 430 // Index of the child's top position in the mLocation array 431 private static final int CHILD_TOP_INDEX = 1; 432 433 // Child views of this ViewGroup 434 private View[] mChildren; 435 // Number of valid children in the mChildren array, the rest should be null or not 436 // considered as children 437 private int mChildrenCount; 438 439 // Whether layout calls are currently being suppressed, controlled by calls to 440 // suppressLayout() 441 boolean mSuppressLayout = false; 442 443 // Whether any layout calls have actually been suppressed while mSuppressLayout 444 // has been true. This tracks whether we need to issue a requestLayout() when 445 // layout is later re-enabled. 446 private boolean mLayoutCalledWhileSuppressed = false; 447 448 private static final int ARRAY_INITIAL_CAPACITY = 12; 449 private static final int ARRAY_CAPACITY_INCREMENT = 12; 450 451 private static Paint sDebugPaint; 452 private static float[] sDebugLines; 453 454 // Used to draw cached views 455 Paint mCachePaint; 456 457 // Used to animate add/remove changes in layout 458 private LayoutTransition mTransition; 459 460 // The set of views that are currently being transitioned. This list is used to track views 461 // being removed that should not actually be removed from the parent yet because they are 462 // being animated. 463 private ArrayList<View> mTransitioningViews; 464 465 // List of children changing visibility. This is used to potentially keep rendering 466 // views during a transition when they otherwise would have become gone/invisible 467 private ArrayList<View> mVisibilityChangingChildren; 468 469 // Temporary holder of presorted children, only used for 470 // input/software draw dispatch for correctly Z ordering. 471 private ArrayList<View> mPreSortedChildren; 472 473 // Indicates how many of this container's child subtrees contain transient state 474 @ViewDebug.ExportedProperty(category = "layout") 475 private int mChildCountWithTransientState = 0; 476 477 // Iterator over the children in decreasing Z order (top children first). 478 private OrderedChildIterator mOrderedChildIterator; 479 480 /** 481 * Currently registered axes for nested scrolling. Flag set consisting of 482 * {@link #SCROLL_AXIS_HORIZONTAL} {@link #SCROLL_AXIS_VERTICAL} or {@link #SCROLL_AXIS_NONE} 483 * for null. 484 */ 485 private int mNestedScrollAxes; 486 487 public ViewGroup(Context context) { 488 this(context, null); 489 } 490 491 public ViewGroup(Context context, AttributeSet attrs) { 492 this(context, attrs, 0); 493 } 494 495 public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr) { 496 this(context, attrs, defStyleAttr, 0); 497 } 498 499 public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 500 super(context, attrs, defStyleAttr, defStyleRes); 501 initViewGroup(); 502 initFromAttributes(context, attrs, defStyleAttr, defStyleRes); 503 } 504 505 private boolean debugDraw() { 506 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 507 } 508 509 private void initViewGroup() { 510 // ViewGroup doesn't draw by default 511 if (!debugDraw()) { 512 setFlags(WILL_NOT_DRAW, DRAW_MASK); 513 } 514 mGroupFlags |= FLAG_CLIP_CHILDREN; 515 mGroupFlags |= FLAG_CLIP_TO_PADDING; 516 mGroupFlags |= FLAG_ANIMATION_DONE; 517 mGroupFlags |= FLAG_ANIMATION_CACHE; 518 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 519 520 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 521 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 522 } 523 524 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 525 526 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 527 mChildrenCount = 0; 528 529 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 530 } 531 532 private void initFromAttributes( 533 Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) { 534 final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ViewGroup, defStyleAttr, 535 defStyleRes); 536 537 final int N = a.getIndexCount(); 538 for (int i = 0; i < N; i++) { 539 int attr = a.getIndex(i); 540 switch (attr) { 541 case R.styleable.ViewGroup_clipChildren: 542 setClipChildren(a.getBoolean(attr, true)); 543 break; 544 case R.styleable.ViewGroup_clipToPadding: 545 setClipToPadding(a.getBoolean(attr, true)); 546 break; 547 case R.styleable.ViewGroup_animationCache: 548 setAnimationCacheEnabled(a.getBoolean(attr, true)); 549 break; 550 case R.styleable.ViewGroup_persistentDrawingCache: 551 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 552 break; 553 case R.styleable.ViewGroup_addStatesFromChildren: 554 setAddStatesFromChildren(a.getBoolean(attr, false)); 555 break; 556 case R.styleable.ViewGroup_alwaysDrawnWithCache: 557 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 558 break; 559 case R.styleable.ViewGroup_layoutAnimation: 560 int id = a.getResourceId(attr, -1); 561 if (id > 0) { 562 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 563 } 564 break; 565 case R.styleable.ViewGroup_descendantFocusability: 566 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 567 break; 568 case R.styleable.ViewGroup_splitMotionEvents: 569 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 570 break; 571 case R.styleable.ViewGroup_animateLayoutChanges: 572 boolean animateLayoutChanges = a.getBoolean(attr, false); 573 if (animateLayoutChanges) { 574 setLayoutTransition(new LayoutTransition()); 575 } 576 break; 577 case R.styleable.ViewGroup_layoutMode: 578 setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); 579 break; 580 case R.styleable.ViewGroup_transitionGroup: 581 setTransitionGroup(a.getBoolean(attr, false)); 582 break; 583 case R.styleable.ViewGroup_touchscreenBlocksFocus: 584 setTouchscreenBlocksFocus(a.getBoolean(attr, false)); 585 break; 586 } 587 } 588 589 a.recycle(); 590 } 591 592 /** 593 * Gets the descendant focusability of this view group. The descendant 594 * focusability defines the relationship between this view group and its 595 * descendants when looking for a view to take focus in 596 * {@link #requestFocus(int, android.graphics.Rect)}. 597 * 598 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 599 * {@link #FOCUS_BLOCK_DESCENDANTS}. 600 */ 601 @ViewDebug.ExportedProperty(category = "focus", mapping = { 602 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 603 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 604 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 605 }) 606 public int getDescendantFocusability() { 607 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 608 } 609 610 /** 611 * Set the descendant focusability of this view group. This defines the relationship 612 * between this view group and its descendants when looking for a view to 613 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 614 * 615 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 616 * {@link #FOCUS_BLOCK_DESCENDANTS}. 617 */ 618 public void setDescendantFocusability(int focusability) { 619 switch (focusability) { 620 case FOCUS_BEFORE_DESCENDANTS: 621 case FOCUS_AFTER_DESCENDANTS: 622 case FOCUS_BLOCK_DESCENDANTS: 623 break; 624 default: 625 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 626 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 627 } 628 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 629 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 630 } 631 632 /** 633 * {@inheritDoc} 634 */ 635 @Override 636 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 637 if (mFocused != null) { 638 mFocused.unFocus(this); 639 mFocused = null; 640 } 641 super.handleFocusGainInternal(direction, previouslyFocusedRect); 642 } 643 644 /** 645 * {@inheritDoc} 646 */ 647 public void requestChildFocus(View child, View focused) { 648 if (DBG) { 649 System.out.println(this + " requestChildFocus()"); 650 } 651 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 652 return; 653 } 654 655 // Unfocus us, if necessary 656 super.unFocus(focused); 657 658 // We had a previous notion of who had focus. Clear it. 659 if (mFocused != child) { 660 if (mFocused != null) { 661 mFocused.unFocus(focused); 662 } 663 664 mFocused = child; 665 } 666 if (mParent != null) { 667 mParent.requestChildFocus(this, focused); 668 } 669 } 670 671 /** 672 * {@inheritDoc} 673 */ 674 public void focusableViewAvailable(View v) { 675 if (mParent != null 676 // shortcut: don't report a new focusable view if we block our descendants from 677 // getting focus 678 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 679 && (isFocusableInTouchMode() || !shouldBlockFocusForTouchscreen()) 680 // shortcut: don't report a new focusable view if we already are focused 681 // (and we don't prefer our descendants) 682 // 683 // note: knowing that mFocused is non-null is not a good enough reason 684 // to break the traversal since in that case we'd actually have to find 685 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 686 // an ancestor of v; this will get checked for at ViewAncestor 687 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 688 mParent.focusableViewAvailable(v); 689 } 690 } 691 692 /** 693 * {@inheritDoc} 694 */ 695 public boolean showContextMenuForChild(View originalView) { 696 return mParent != null && mParent.showContextMenuForChild(originalView); 697 } 698 699 /** 700 * {@inheritDoc} 701 */ 702 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 703 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 704 } 705 706 /** 707 * Find the nearest view in the specified direction that wants to take 708 * focus. 709 * 710 * @param focused The view that currently has focus 711 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 712 * FOCUS_RIGHT, or 0 for not applicable. 713 */ 714 public View focusSearch(View focused, int direction) { 715 if (isRootNamespace()) { 716 // root namespace means we should consider ourselves the top of the 717 // tree for focus searching; otherwise we could be focus searching 718 // into other tabs. see LocalActivityManager and TabHost for more info 719 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 720 } else if (mParent != null) { 721 return mParent.focusSearch(focused, direction); 722 } 723 return null; 724 } 725 726 /** 727 * {@inheritDoc} 728 */ 729 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 730 return false; 731 } 732 733 /** 734 * {@inheritDoc} 735 */ 736 @Override 737 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 738 ViewParent parent = mParent; 739 if (parent == null) { 740 return false; 741 } 742 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 743 if (!propagate) { 744 return false; 745 } 746 return parent.requestSendAccessibilityEvent(this, event); 747 } 748 749 /** 750 * Called when a child has requested sending an {@link AccessibilityEvent} and 751 * gives an opportunity to its parent to augment the event. 752 * <p> 753 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 754 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 755 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 756 * is responsible for handling this call. 757 * </p> 758 * 759 * @param child The child which requests sending the event. 760 * @param event The event to be sent. 761 * @return True if the event should be sent. 762 * 763 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 764 */ 765 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 766 if (mAccessibilityDelegate != null) { 767 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 768 } else { 769 return onRequestSendAccessibilityEventInternal(child, event); 770 } 771 } 772 773 /** 774 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 775 * 776 * Note: Called from the default {@link View.AccessibilityDelegate}. 777 */ 778 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 779 return true; 780 } 781 782 /** 783 * Translates the given bounds and intersections from child coordinates to 784 * local coordinates. In case any interactive sibling of the calling child 785 * covers the latter, a new intersections is added to the intersection list. 786 * This method is for the exclusive use by the accessibility layer to compute 787 * a point where a sequence of down and up events would click on a view. 788 * 789 * @param child The child making the call. 790 * @param bounds The bounds to translate in child coordinates. 791 * @param intersections The intersections of interactive views covering the child. 792 * @return True if the bounds and intersections were computed, false otherwise. 793 */ 794 boolean translateBoundsAndIntersectionsInWindowCoordinates(View child, 795 RectF bounds, List<RectF> intersections) { 796 // Not attached, done. 797 if (mAttachInfo == null) { 798 return false; 799 } 800 801 if (getAlpha() <= 0 || getTransitionAlpha() <= 0 || 802 getVisibility() != VISIBLE) { 803 // Cannot click on a view with an invisible predecessor. 804 return false; 805 } 806 807 // Compensate for the child transformation. 808 if (!child.hasIdentityMatrix()) { 809 Matrix matrix = child.getMatrix(); 810 matrix.mapRect(bounds); 811 final int intersectionCount = intersections.size(); 812 for (int i = 0; i < intersectionCount; i++) { 813 RectF intersection = intersections.get(i); 814 matrix.mapRect(intersection); 815 } 816 } 817 818 // Translate the bounds from child to parent coordinates. 819 final int dx = child.mLeft - mScrollX; 820 final int dy = child.mTop - mScrollY; 821 bounds.offset(dx, dy); 822 offsetRects(intersections, dx, dy); 823 824 // If the bounds do not intersect our bounds, done. 825 if (!bounds.intersects(0, 0, getWidth(), getHeight())) { 826 return false; 827 } 828 829 // Clip the bounds by our bounds. 830 bounds.left = Math.max(bounds.left, 0); 831 bounds.top = Math.max(bounds.top, 0); 832 bounds.right = Math.min(bounds.right, mRight); 833 bounds.bottom = Math.min(bounds.bottom, mBottom); 834 835 Iterator<View> iterator = obtainOrderedChildIterator(); 836 while (iterator.hasNext()) { 837 View sibling = iterator.next(); 838 839 // We care only about siblings over the child. 840 if (sibling == child) { 841 break; 842 } 843 844 // Ignore invisible views as they are not interactive. 845 if (!isVisible(sibling)) { 846 continue; 847 } 848 849 // Compute the sibling bounds in its coordinates. 850 RectF siblingBounds = mAttachInfo.mTmpTransformRect1; 851 siblingBounds.set(0, 0, sibling.getWidth(), sibling.getHeight()); 852 853 // Translate the sibling bounds to our coordinates. 854 offsetChildRectToMyCoords(siblingBounds, sibling); 855 856 // Compute the intersection between the child and the sibling. 857 if (siblingBounds.intersect(bounds)) { 858 List<RectF> clickableRects = new ArrayList<>(); 859 sibling.addClickableRectsForAccessibility(clickableRects); 860 861 final int clickableRectCount = clickableRects.size(); 862 for (int j = 0; j < clickableRectCount; j++) { 863 RectF clickableRect = clickableRects.get(j); 864 865 // Translate the clickable rect to our coordinates. 866 offsetChildRectToMyCoords(clickableRect, sibling); 867 868 // Compute the intersection between the child and the clickable rects. 869 if (clickableRect.intersect(bounds)) { 870 // If a clickable rect completely covers the child, done. 871 if (clickableRect.equals(bounds)) { 872 releaseOrderedChildIterator(); 873 return false; 874 } 875 // Keep track of the intersection rectangle. 876 intersections.add(clickableRect); 877 } 878 } 879 } 880 } 881 882 releaseOrderedChildIterator(); 883 884 if (mParent instanceof ViewGroup) { 885 ViewGroup parentGroup = (ViewGroup) mParent; 886 return parentGroup.translateBoundsAndIntersectionsInWindowCoordinates( 887 this, bounds, intersections); 888 } 889 890 return true; 891 } 892 893 /** 894 * @hide 895 */ 896 @Override 897 public void addClickableRectsForAccessibility(List<RectF> outRects) { 898 int sizeBefore = outRects.size(); 899 900 super.addClickableRectsForAccessibility(outRects); 901 902 // If we added ourselves, then no need to visit children. 903 if (outRects.size() > sizeBefore) { 904 return; 905 } 906 907 Iterator<View> iterator = obtainOrderedChildIterator(); 908 while (iterator.hasNext()) { 909 View child = iterator.next(); 910 911 // Cannot click on an invisible view. 912 if (!isVisible(child)) { 913 continue; 914 } 915 916 sizeBefore = outRects.size(); 917 918 // Add clickable rects in the child bounds. 919 child.addClickableRectsForAccessibility(outRects); 920 921 // Offset the clickable rects for out children to our coordinates. 922 final int sizeAfter = outRects.size(); 923 for (int j = sizeBefore; j < sizeAfter; j++) { 924 RectF rect = outRects.get(j); 925 926 // Translate the clickable rect to our coordinates. 927 offsetChildRectToMyCoords(rect, child); 928 929 // If a clickable rect fills the parent, done. 930 if ((int) rect.left == 0 && (int) rect.top == 0 931 && (int) rect.right == mRight && (int) rect.bottom == mBottom) { 932 releaseOrderedChildIterator(); 933 return; 934 } 935 } 936 } 937 938 releaseOrderedChildIterator(); 939 } 940 941 private void offsetChildRectToMyCoords(RectF rect, View child) { 942 if (!child.hasIdentityMatrix()) { 943 child.getMatrix().mapRect(rect); 944 } 945 final int childDx = child.mLeft - mScrollX; 946 final int childDy = child.mTop - mScrollY; 947 rect.offset(childDx, childDy); 948 } 949 950 private static boolean isVisible(View view) { 951 return (view.getAlpha() > 0 && view.getTransitionAlpha() > 0 && 952 view.getVisibility() == VISIBLE); 953 } 954 955 /** 956 * Obtains the iterator to traverse the children in a descending Z order. 957 * Only one party can use the iterator at any given time and you cannot 958 * modify the children while using this iterator. Acquisition if already 959 * obtained is an error. 960 * 961 * @return The child iterator. 962 */ 963 OrderedChildIterator obtainOrderedChildIterator() { 964 if (mOrderedChildIterator == null) { 965 mOrderedChildIterator = new OrderedChildIterator(); 966 } else if (mOrderedChildIterator.isInitialized()) { 967 throw new IllegalStateException("Already obtained"); 968 } 969 mOrderedChildIterator.initialize(); 970 return mOrderedChildIterator; 971 } 972 973 /** 974 * Releases the iterator to traverse the children in a descending Z order. 975 * Release if not obtained is an error. 976 */ 977 void releaseOrderedChildIterator() { 978 if (mOrderedChildIterator == null || !mOrderedChildIterator.isInitialized()) { 979 throw new IllegalStateException("Not obtained"); 980 } 981 mOrderedChildIterator.release(); 982 } 983 984 /** 985 * Called when a child view has changed whether or not it is tracking transient state. 986 */ 987 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 988 final boolean oldHasTransientState = hasTransientState(); 989 if (childHasTransientState) { 990 mChildCountWithTransientState++; 991 } else { 992 mChildCountWithTransientState--; 993 } 994 995 final boolean newHasTransientState = hasTransientState(); 996 if (mParent != null && oldHasTransientState != newHasTransientState) { 997 try { 998 mParent.childHasTransientStateChanged(this, newHasTransientState); 999 } catch (AbstractMethodError e) { 1000 Log.e(TAG, mParent.getClass().getSimpleName() + 1001 " does not fully implement ViewParent", e); 1002 } 1003 } 1004 } 1005 1006 @Override 1007 public boolean hasTransientState() { 1008 return mChildCountWithTransientState > 0 || super.hasTransientState(); 1009 } 1010 1011 /** 1012 * {@inheritDoc} 1013 */ 1014 @Override 1015 public boolean dispatchUnhandledMove(View focused, int direction) { 1016 return mFocused != null && 1017 mFocused.dispatchUnhandledMove(focused, direction); 1018 } 1019 1020 /** 1021 * {@inheritDoc} 1022 */ 1023 public void clearChildFocus(View child) { 1024 if (DBG) { 1025 System.out.println(this + " clearChildFocus()"); 1026 } 1027 1028 mFocused = null; 1029 if (mParent != null) { 1030 mParent.clearChildFocus(this); 1031 } 1032 } 1033 1034 /** 1035 * {@inheritDoc} 1036 */ 1037 @Override 1038 public void clearFocus() { 1039 if (DBG) { 1040 System.out.println(this + " clearFocus()"); 1041 } 1042 if (mFocused == null) { 1043 super.clearFocus(); 1044 } else { 1045 View focused = mFocused; 1046 mFocused = null; 1047 focused.clearFocus(); 1048 } 1049 } 1050 1051 /** 1052 * {@inheritDoc} 1053 */ 1054 @Override 1055 void unFocus(View focused) { 1056 if (DBG) { 1057 System.out.println(this + " unFocus()"); 1058 } 1059 if (mFocused == null) { 1060 super.unFocus(focused); 1061 } else { 1062 mFocused.unFocus(focused); 1063 mFocused = null; 1064 } 1065 } 1066 1067 /** 1068 * Returns the focused child of this view, if any. The child may have focus 1069 * or contain focus. 1070 * 1071 * @return the focused child or null. 1072 */ 1073 public View getFocusedChild() { 1074 return mFocused; 1075 } 1076 1077 View getDeepestFocusedChild() { 1078 View v = this; 1079 while (v != null) { 1080 if (v.isFocused()) { 1081 return v; 1082 } 1083 v = v instanceof ViewGroup ? ((ViewGroup) v).getFocusedChild() : null; 1084 } 1085 return null; 1086 } 1087 1088 /** 1089 * Returns true if this view has or contains focus 1090 * 1091 * @return true if this view has or contains focus 1092 */ 1093 @Override 1094 public boolean hasFocus() { 1095 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 1096 } 1097 1098 /* 1099 * (non-Javadoc) 1100 * 1101 * @see android.view.View#findFocus() 1102 */ 1103 @Override 1104 public View findFocus() { 1105 if (DBG) { 1106 System.out.println("Find focus in " + this + ": flags=" 1107 + isFocused() + ", child=" + mFocused); 1108 } 1109 1110 if (isFocused()) { 1111 return this; 1112 } 1113 1114 if (mFocused != null) { 1115 return mFocused.findFocus(); 1116 } 1117 return null; 1118 } 1119 1120 /** 1121 * {@inheritDoc} 1122 */ 1123 @Override 1124 public boolean hasFocusable() { 1125 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 1126 return false; 1127 } 1128 1129 if (isFocusable()) { 1130 return true; 1131 } 1132 1133 final int descendantFocusability = getDescendantFocusability(); 1134 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 1135 final int count = mChildrenCount; 1136 final View[] children = mChildren; 1137 1138 for (int i = 0; i < count; i++) { 1139 final View child = children[i]; 1140 if (child.hasFocusable()) { 1141 return true; 1142 } 1143 } 1144 } 1145 1146 return false; 1147 } 1148 1149 /** 1150 * {@inheritDoc} 1151 */ 1152 @Override 1153 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 1154 final int focusableCount = views.size(); 1155 1156 final int descendantFocusability = getDescendantFocusability(); 1157 1158 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 1159 if (shouldBlockFocusForTouchscreen()) { 1160 focusableMode |= FOCUSABLES_TOUCH_MODE; 1161 } 1162 1163 final int count = mChildrenCount; 1164 final View[] children = mChildren; 1165 1166 for (int i = 0; i < count; i++) { 1167 final View child = children[i]; 1168 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1169 child.addFocusables(views, direction, focusableMode); 1170 } 1171 } 1172 } 1173 1174 // we add ourselves (if focusable) in all cases except for when we are 1175 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 1176 // to avoid the focus search finding layouts when a more precise search 1177 // among the focusable children would be more interesting. 1178 if ((descendantFocusability != FOCUS_AFTER_DESCENDANTS 1179 // No focusable descendants 1180 || (focusableCount == views.size())) && 1181 (isFocusableInTouchMode() || !shouldBlockFocusForTouchscreen())) { 1182 super.addFocusables(views, direction, focusableMode); 1183 } 1184 } 1185 1186 /** 1187 * Set whether this ViewGroup should ignore focus requests for itself and its children. 1188 * If this option is enabled and the ViewGroup or a descendant currently has focus, focus 1189 * will proceed forward. 1190 * 1191 * @param touchscreenBlocksFocus true to enable blocking focus in the presence of a touchscreen 1192 */ 1193 public void setTouchscreenBlocksFocus(boolean touchscreenBlocksFocus) { 1194 if (touchscreenBlocksFocus) { 1195 mGroupFlags |= FLAG_TOUCHSCREEN_BLOCKS_FOCUS; 1196 if (hasFocus()) { 1197 final View focusedChild = getDeepestFocusedChild(); 1198 if (!focusedChild.isFocusableInTouchMode()) { 1199 final View newFocus = focusSearch(FOCUS_FORWARD); 1200 if (newFocus != null) { 1201 newFocus.requestFocus(); 1202 } 1203 } 1204 } 1205 } else { 1206 mGroupFlags &= ~FLAG_TOUCHSCREEN_BLOCKS_FOCUS; 1207 } 1208 } 1209 1210 /** 1211 * Check whether this ViewGroup should ignore focus requests for itself and its children. 1212 */ 1213 public boolean getTouchscreenBlocksFocus() { 1214 return (mGroupFlags & FLAG_TOUCHSCREEN_BLOCKS_FOCUS) != 0; 1215 } 1216 1217 boolean shouldBlockFocusForTouchscreen() { 1218 return getTouchscreenBlocksFocus() && 1219 mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN); 1220 } 1221 1222 @Override 1223 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 1224 super.findViewsWithText(outViews, text, flags); 1225 final int childrenCount = mChildrenCount; 1226 final View[] children = mChildren; 1227 for (int i = 0; i < childrenCount; i++) { 1228 View child = children[i]; 1229 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 1230 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 1231 child.findViewsWithText(outViews, text, flags); 1232 } 1233 } 1234 } 1235 1236 /** @hide */ 1237 @Override 1238 public View findViewByAccessibilityIdTraversal(int accessibilityId) { 1239 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 1240 if (foundView != null) { 1241 return foundView; 1242 } 1243 final int childrenCount = mChildrenCount; 1244 final View[] children = mChildren; 1245 for (int i = 0; i < childrenCount; i++) { 1246 View child = children[i]; 1247 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 1248 if (foundView != null) { 1249 return foundView; 1250 } 1251 } 1252 return null; 1253 } 1254 1255 /** 1256 * {@inheritDoc} 1257 */ 1258 @Override 1259 public void dispatchWindowFocusChanged(boolean hasFocus) { 1260 super.dispatchWindowFocusChanged(hasFocus); 1261 final int count = mChildrenCount; 1262 final View[] children = mChildren; 1263 for (int i = 0; i < count; i++) { 1264 children[i].dispatchWindowFocusChanged(hasFocus); 1265 } 1266 } 1267 1268 /** 1269 * {@inheritDoc} 1270 */ 1271 @Override 1272 public void addTouchables(ArrayList<View> views) { 1273 super.addTouchables(views); 1274 1275 final int count = mChildrenCount; 1276 final View[] children = mChildren; 1277 1278 for (int i = 0; i < count; i++) { 1279 final View child = children[i]; 1280 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1281 child.addTouchables(views); 1282 } 1283 } 1284 } 1285 1286 /** 1287 * @hide 1288 */ 1289 @Override 1290 public void makeOptionalFitsSystemWindows() { 1291 super.makeOptionalFitsSystemWindows(); 1292 final int count = mChildrenCount; 1293 final View[] children = mChildren; 1294 for (int i = 0; i < count; i++) { 1295 children[i].makeOptionalFitsSystemWindows(); 1296 } 1297 } 1298 1299 /** 1300 * {@inheritDoc} 1301 */ 1302 @Override 1303 public void dispatchDisplayHint(int hint) { 1304 super.dispatchDisplayHint(hint); 1305 final int count = mChildrenCount; 1306 final View[] children = mChildren; 1307 for (int i = 0; i < count; i++) { 1308 children[i].dispatchDisplayHint(hint); 1309 } 1310 } 1311 1312 /** 1313 * Called when a view's visibility has changed. Notify the parent to take any appropriate 1314 * action. 1315 * 1316 * @param child The view whose visibility has changed 1317 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 1318 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 1319 * @hide 1320 */ 1321 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 1322 if (mTransition != null) { 1323 if (newVisibility == VISIBLE) { 1324 mTransition.showChild(this, child, oldVisibility); 1325 } else { 1326 mTransition.hideChild(this, child, newVisibility); 1327 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1328 // Only track this on disappearing views - appearing views are already visible 1329 // and don't need special handling during drawChild() 1330 if (mVisibilityChangingChildren == null) { 1331 mVisibilityChangingChildren = new ArrayList<View>(); 1332 } 1333 mVisibilityChangingChildren.add(child); 1334 addDisappearingView(child); 1335 } 1336 } 1337 } 1338 1339 // in all cases, for drags 1340 if (mCurrentDrag != null) { 1341 if (newVisibility == VISIBLE) { 1342 notifyChildOfDrag(child); 1343 } 1344 } 1345 } 1346 1347 /** 1348 * {@inheritDoc} 1349 */ 1350 @Override 1351 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1352 super.dispatchVisibilityChanged(changedView, visibility); 1353 final int count = mChildrenCount; 1354 final View[] children = mChildren; 1355 for (int i = 0; i < count; i++) { 1356 children[i].dispatchVisibilityChanged(changedView, visibility); 1357 } 1358 } 1359 1360 /** 1361 * {@inheritDoc} 1362 */ 1363 @Override 1364 public void dispatchWindowVisibilityChanged(int visibility) { 1365 super.dispatchWindowVisibilityChanged(visibility); 1366 final int count = mChildrenCount; 1367 final View[] children = mChildren; 1368 for (int i = 0; i < count; i++) { 1369 children[i].dispatchWindowVisibilityChanged(visibility); 1370 } 1371 } 1372 1373 /** 1374 * {@inheritDoc} 1375 */ 1376 @Override 1377 public void dispatchConfigurationChanged(Configuration newConfig) { 1378 super.dispatchConfigurationChanged(newConfig); 1379 final int count = mChildrenCount; 1380 final View[] children = mChildren; 1381 for (int i = 0; i < count; i++) { 1382 children[i].dispatchConfigurationChanged(newConfig); 1383 } 1384 } 1385 1386 /** 1387 * {@inheritDoc} 1388 */ 1389 public void recomputeViewAttributes(View child) { 1390 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1391 ViewParent parent = mParent; 1392 if (parent != null) parent.recomputeViewAttributes(this); 1393 } 1394 } 1395 1396 @Override 1397 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1398 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1399 super.dispatchCollectViewAttributes(attachInfo, visibility); 1400 final int count = mChildrenCount; 1401 final View[] children = mChildren; 1402 for (int i = 0; i < count; i++) { 1403 final View child = children[i]; 1404 child.dispatchCollectViewAttributes(attachInfo, 1405 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1406 } 1407 } 1408 } 1409 1410 /** 1411 * {@inheritDoc} 1412 */ 1413 public void bringChildToFront(View child) { 1414 int index = indexOfChild(child); 1415 if (index >= 0) { 1416 removeFromArray(index); 1417 addInArray(child, mChildrenCount); 1418 child.mParent = this; 1419 requestLayout(); 1420 invalidate(); 1421 } 1422 } 1423 1424 private PointF getLocalPoint() { 1425 if (mLocalPoint == null) mLocalPoint = new PointF(); 1426 return mLocalPoint; 1427 } 1428 1429 /** 1430 * {@inheritDoc} 1431 */ 1432 // TODO: Write real docs 1433 @Override 1434 public boolean dispatchDragEvent(DragEvent event) { 1435 boolean retval = false; 1436 final float tx = event.mX; 1437 final float ty = event.mY; 1438 1439 ViewRootImpl root = getViewRootImpl(); 1440 1441 // Dispatch down the view hierarchy 1442 final PointF localPoint = getLocalPoint(); 1443 1444 switch (event.mAction) { 1445 case DragEvent.ACTION_DRAG_STARTED: { 1446 // clear state to recalculate which views we drag over 1447 mCurrentDragView = null; 1448 1449 // Set up our tracking of drag-started notifications 1450 mCurrentDrag = DragEvent.obtain(event); 1451 if (mDragNotifiedChildren == null) { 1452 mDragNotifiedChildren = new HashSet<View>(); 1453 } else { 1454 mDragNotifiedChildren.clear(); 1455 } 1456 1457 // Now dispatch down to our children, caching the responses 1458 mChildAcceptsDrag = false; 1459 final int count = mChildrenCount; 1460 final View[] children = mChildren; 1461 for (int i = 0; i < count; i++) { 1462 final View child = children[i]; 1463 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1464 if (child.getVisibility() == VISIBLE) { 1465 final boolean handled = notifyChildOfDrag(children[i]); 1466 if (handled) { 1467 mChildAcceptsDrag = true; 1468 } 1469 } 1470 } 1471 1472 // Return HANDLED if one of our children can accept the drag 1473 if (mChildAcceptsDrag) { 1474 retval = true; 1475 } 1476 } break; 1477 1478 case DragEvent.ACTION_DRAG_ENDED: { 1479 // Release the bookkeeping now that the drag lifecycle has ended 1480 if (mDragNotifiedChildren != null) { 1481 for (View child : mDragNotifiedChildren) { 1482 // If a child was notified about an ongoing drag, it's told that it's over 1483 child.dispatchDragEvent(event); 1484 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1485 child.refreshDrawableState(); 1486 } 1487 1488 mDragNotifiedChildren.clear(); 1489 if (mCurrentDrag != null) { 1490 mCurrentDrag.recycle(); 1491 mCurrentDrag = null; 1492 } 1493 } 1494 1495 // We consider drag-ended to have been handled if one of our children 1496 // had offered to handle the drag. 1497 if (mChildAcceptsDrag) { 1498 retval = true; 1499 } 1500 } break; 1501 1502 case DragEvent.ACTION_DRAG_LOCATION: { 1503 // Find the [possibly new] drag target 1504 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1505 1506 // If we've changed apparent drag target, tell the view root which view 1507 // we're over now [for purposes of the eventual drag-recipient-changed 1508 // notifications to the framework] and tell the new target that the drag 1509 // has entered its bounds. The root will see setDragFocus() calls all 1510 // the way down to the final leaf view that is handling the LOCATION event 1511 // before reporting the new potential recipient to the framework. 1512 if (mCurrentDragView != target) { 1513 root.setDragFocus(target); 1514 1515 final int action = event.mAction; 1516 // If we've dragged off of a child view, send it the EXITED message 1517 if (mCurrentDragView != null) { 1518 final View view = mCurrentDragView; 1519 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1520 view.dispatchDragEvent(event); 1521 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1522 view.refreshDrawableState(); 1523 } 1524 mCurrentDragView = target; 1525 1526 // If we've dragged over a new child view, send it the ENTERED message 1527 if (target != null) { 1528 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1529 target.dispatchDragEvent(event); 1530 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1531 target.refreshDrawableState(); 1532 } 1533 event.mAction = action; // restore the event's original state 1534 } 1535 1536 // Dispatch the actual drag location notice, localized into its coordinates 1537 if (target != null) { 1538 event.mX = localPoint.x; 1539 event.mY = localPoint.y; 1540 1541 retval = target.dispatchDragEvent(event); 1542 1543 event.mX = tx; 1544 event.mY = ty; 1545 } 1546 } break; 1547 1548 /* Entered / exited dispatch 1549 * 1550 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1551 * that we're about to get the corresponding LOCATION event, which we will use to 1552 * determine which of our children is the new target; at that point we will 1553 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1554 * 1555 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1556 * drag has left this ViewGroup, we know by definition that every contained subview 1557 * is also no longer under the drag point. 1558 */ 1559 1560 case DragEvent.ACTION_DRAG_EXITED: { 1561 if (mCurrentDragView != null) { 1562 final View view = mCurrentDragView; 1563 view.dispatchDragEvent(event); 1564 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1565 view.refreshDrawableState(); 1566 1567 mCurrentDragView = null; 1568 } 1569 } break; 1570 1571 case DragEvent.ACTION_DROP: { 1572 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1573 View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint); 1574 if (target != null) { 1575 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1576 event.mX = localPoint.x; 1577 event.mY = localPoint.y; 1578 retval = target.dispatchDragEvent(event); 1579 event.mX = tx; 1580 event.mY = ty; 1581 } else { 1582 if (ViewDebug.DEBUG_DRAG) { 1583 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1584 } 1585 } 1586 } break; 1587 } 1588 1589 // If none of our children could handle the event, try here 1590 if (!retval) { 1591 // Call up to the View implementation that dispatches to installed listeners 1592 retval = super.dispatchDragEvent(event); 1593 } 1594 return retval; 1595 } 1596 1597 // Find the frontmost child view that lies under the given point, and calculate 1598 // the position within its own local coordinate system. 1599 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1600 final int count = mChildrenCount; 1601 final View[] children = mChildren; 1602 for (int i = count - 1; i >= 0; i--) { 1603 final View child = children[i]; 1604 if (!child.canAcceptDrag()) { 1605 continue; 1606 } 1607 1608 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1609 return child; 1610 } 1611 } 1612 return null; 1613 } 1614 1615 boolean notifyChildOfDrag(View child) { 1616 if (ViewDebug.DEBUG_DRAG) { 1617 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1618 } 1619 1620 boolean canAccept = false; 1621 if (! mDragNotifiedChildren.contains(child)) { 1622 mDragNotifiedChildren.add(child); 1623 canAccept = child.dispatchDragEvent(mCurrentDrag); 1624 if (canAccept && !child.canAcceptDrag()) { 1625 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1626 child.refreshDrawableState(); 1627 } 1628 } 1629 return canAccept; 1630 } 1631 1632 @Override 1633 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1634 super.dispatchWindowSystemUiVisiblityChanged(visible); 1635 1636 final int count = mChildrenCount; 1637 final View[] children = mChildren; 1638 for (int i=0; i <count; i++) { 1639 final View child = children[i]; 1640 child.dispatchWindowSystemUiVisiblityChanged(visible); 1641 } 1642 } 1643 1644 @Override 1645 public void dispatchSystemUiVisibilityChanged(int visible) { 1646 super.dispatchSystemUiVisibilityChanged(visible); 1647 1648 final int count = mChildrenCount; 1649 final View[] children = mChildren; 1650 for (int i=0; i <count; i++) { 1651 final View child = children[i]; 1652 child.dispatchSystemUiVisibilityChanged(visible); 1653 } 1654 } 1655 1656 @Override 1657 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1658 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1659 1660 final int count = mChildrenCount; 1661 final View[] children = mChildren; 1662 for (int i=0; i <count; i++) { 1663 final View child = children[i]; 1664 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1665 } 1666 return changed; 1667 } 1668 1669 /** 1670 * {@inheritDoc} 1671 */ 1672 @Override 1673 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1674 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1675 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1676 return super.dispatchKeyEventPreIme(event); 1677 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1678 == PFLAG_HAS_BOUNDS) { 1679 return mFocused.dispatchKeyEventPreIme(event); 1680 } 1681 return false; 1682 } 1683 1684 /** 1685 * {@inheritDoc} 1686 */ 1687 @Override 1688 public boolean dispatchKeyEvent(KeyEvent event) { 1689 if (mInputEventConsistencyVerifier != null) { 1690 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1691 } 1692 1693 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1694 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1695 if (super.dispatchKeyEvent(event)) { 1696 return true; 1697 } 1698 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1699 == PFLAG_HAS_BOUNDS) { 1700 if (mFocused.dispatchKeyEvent(event)) { 1701 return true; 1702 } 1703 } 1704 1705 if (mInputEventConsistencyVerifier != null) { 1706 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1707 } 1708 return false; 1709 } 1710 1711 /** 1712 * {@inheritDoc} 1713 */ 1714 @Override 1715 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1716 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1717 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1718 return super.dispatchKeyShortcutEvent(event); 1719 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1720 == PFLAG_HAS_BOUNDS) { 1721 return mFocused.dispatchKeyShortcutEvent(event); 1722 } 1723 return false; 1724 } 1725 1726 /** 1727 * {@inheritDoc} 1728 */ 1729 @Override 1730 public boolean dispatchTrackballEvent(MotionEvent event) { 1731 if (mInputEventConsistencyVerifier != null) { 1732 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1733 } 1734 1735 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1736 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1737 if (super.dispatchTrackballEvent(event)) { 1738 return true; 1739 } 1740 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1741 == PFLAG_HAS_BOUNDS) { 1742 if (mFocused.dispatchTrackballEvent(event)) { 1743 return true; 1744 } 1745 } 1746 1747 if (mInputEventConsistencyVerifier != null) { 1748 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1749 } 1750 return false; 1751 } 1752 1753 /** 1754 * {@inheritDoc} 1755 */ 1756 @SuppressWarnings({"ConstantConditions"}) 1757 @Override 1758 protected boolean dispatchHoverEvent(MotionEvent event) { 1759 final int action = event.getAction(); 1760 1761 // First check whether the view group wants to intercept the hover event. 1762 final boolean interceptHover = onInterceptHoverEvent(event); 1763 event.setAction(action); // restore action in case it was changed 1764 1765 MotionEvent eventNoHistory = event; 1766 boolean handled = false; 1767 1768 // Send events to the hovered children and build a new list of hover targets until 1769 // one is found that handles the event. 1770 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1771 mFirstHoverTarget = null; 1772 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1773 final float x = event.getX(); 1774 final float y = event.getY(); 1775 final int childrenCount = mChildrenCount; 1776 if (childrenCount != 0) { 1777 final ArrayList<View> preorderedList = buildOrderedChildList(); 1778 final boolean customOrder = preorderedList == null 1779 && isChildrenDrawingOrderEnabled(); 1780 final View[] children = mChildren; 1781 HoverTarget lastHoverTarget = null; 1782 for (int i = childrenCount - 1; i >= 0; i--) { 1783 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1784 final View child = (preorderedList == null) 1785 ? children[childIndex] : preorderedList.get(childIndex); 1786 if (!canViewReceivePointerEvents(child) 1787 || !isTransformedTouchPointInView(x, y, child, null)) { 1788 continue; 1789 } 1790 1791 // Obtain a hover target for this child. Dequeue it from the 1792 // old hover target list if the child was previously hovered. 1793 HoverTarget hoverTarget = firstOldHoverTarget; 1794 final boolean wasHovered; 1795 for (HoverTarget predecessor = null; ;) { 1796 if (hoverTarget == null) { 1797 hoverTarget = HoverTarget.obtain(child); 1798 wasHovered = false; 1799 break; 1800 } 1801 1802 if (hoverTarget.child == child) { 1803 if (predecessor != null) { 1804 predecessor.next = hoverTarget.next; 1805 } else { 1806 firstOldHoverTarget = hoverTarget.next; 1807 } 1808 hoverTarget.next = null; 1809 wasHovered = true; 1810 break; 1811 } 1812 1813 predecessor = hoverTarget; 1814 hoverTarget = hoverTarget.next; 1815 } 1816 1817 // Enqueue the hover target onto the new hover target list. 1818 if (lastHoverTarget != null) { 1819 lastHoverTarget.next = hoverTarget; 1820 } else { 1821 mFirstHoverTarget = hoverTarget; 1822 } 1823 lastHoverTarget = hoverTarget; 1824 1825 // Dispatch the event to the child. 1826 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1827 if (!wasHovered) { 1828 // Send the enter as is. 1829 handled |= dispatchTransformedGenericPointerEvent( 1830 event, child); // enter 1831 } 1832 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1833 if (!wasHovered) { 1834 // Synthesize an enter from a move. 1835 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1836 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1837 handled |= dispatchTransformedGenericPointerEvent( 1838 eventNoHistory, child); // enter 1839 eventNoHistory.setAction(action); 1840 1841 handled |= dispatchTransformedGenericPointerEvent( 1842 eventNoHistory, child); // move 1843 } else { 1844 // Send the move as is. 1845 handled |= dispatchTransformedGenericPointerEvent(event, child); 1846 } 1847 } 1848 if (handled) { 1849 break; 1850 } 1851 } 1852 if (preorderedList != null) preorderedList.clear(); 1853 } 1854 } 1855 1856 // Send exit events to all previously hovered children that are no longer hovered. 1857 while (firstOldHoverTarget != null) { 1858 final View child = firstOldHoverTarget.child; 1859 1860 // Exit the old hovered child. 1861 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1862 // Send the exit as is. 1863 handled |= dispatchTransformedGenericPointerEvent( 1864 event, child); // exit 1865 } else { 1866 // Synthesize an exit from a move or enter. 1867 // Ignore the result because hover focus has moved to a different view. 1868 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1869 dispatchTransformedGenericPointerEvent( 1870 event, child); // move 1871 } 1872 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1873 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1874 dispatchTransformedGenericPointerEvent( 1875 eventNoHistory, child); // exit 1876 eventNoHistory.setAction(action); 1877 } 1878 1879 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1880 firstOldHoverTarget.recycle(); 1881 firstOldHoverTarget = nextOldHoverTarget; 1882 } 1883 1884 // Send events to the view group itself if no children have handled it. 1885 boolean newHoveredSelf = !handled; 1886 if (newHoveredSelf == mHoveredSelf) { 1887 if (newHoveredSelf) { 1888 // Send event to the view group as before. 1889 handled |= super.dispatchHoverEvent(event); 1890 } 1891 } else { 1892 if (mHoveredSelf) { 1893 // Exit the view group. 1894 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1895 // Send the exit as is. 1896 handled |= super.dispatchHoverEvent(event); // exit 1897 } else { 1898 // Synthesize an exit from a move or enter. 1899 // Ignore the result because hover focus is moving to a different view. 1900 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1901 super.dispatchHoverEvent(event); // move 1902 } 1903 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1904 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1905 super.dispatchHoverEvent(eventNoHistory); // exit 1906 eventNoHistory.setAction(action); 1907 } 1908 mHoveredSelf = false; 1909 } 1910 1911 if (newHoveredSelf) { 1912 // Enter the view group. 1913 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1914 // Send the enter as is. 1915 handled |= super.dispatchHoverEvent(event); // enter 1916 mHoveredSelf = true; 1917 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1918 // Synthesize an enter from a move. 1919 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1920 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1921 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1922 eventNoHistory.setAction(action); 1923 1924 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1925 mHoveredSelf = true; 1926 } 1927 } 1928 } 1929 1930 // Recycle the copy of the event that we made. 1931 if (eventNoHistory != event) { 1932 eventNoHistory.recycle(); 1933 } 1934 1935 // Done. 1936 return handled; 1937 } 1938 1939 private void exitHoverTargets() { 1940 if (mHoveredSelf || mFirstHoverTarget != null) { 1941 final long now = SystemClock.uptimeMillis(); 1942 MotionEvent event = MotionEvent.obtain(now, now, 1943 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1944 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1945 dispatchHoverEvent(event); 1946 event.recycle(); 1947 } 1948 } 1949 1950 private void cancelHoverTarget(View view) { 1951 HoverTarget predecessor = null; 1952 HoverTarget target = mFirstHoverTarget; 1953 while (target != null) { 1954 final HoverTarget next = target.next; 1955 if (target.child == view) { 1956 if (predecessor == null) { 1957 mFirstHoverTarget = next; 1958 } else { 1959 predecessor.next = next; 1960 } 1961 target.recycle(); 1962 1963 final long now = SystemClock.uptimeMillis(); 1964 MotionEvent event = MotionEvent.obtain(now, now, 1965 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1966 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1967 view.dispatchHoverEvent(event); 1968 event.recycle(); 1969 return; 1970 } 1971 predecessor = target; 1972 target = next; 1973 } 1974 } 1975 1976 /** @hide */ 1977 @Override 1978 protected boolean hasHoveredChild() { 1979 return mFirstHoverTarget != null; 1980 } 1981 1982 @Override 1983 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1984 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1985 try { 1986 final int childrenCount = children.getChildCount(); 1987 for (int i = 0; i < childrenCount; i++) { 1988 View child = children.getChildAt(i); 1989 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1990 if (child.includeForAccessibility()) { 1991 childrenForAccessibility.add(child); 1992 } else { 1993 child.addChildrenForAccessibility(childrenForAccessibility); 1994 } 1995 } 1996 } 1997 } finally { 1998 children.recycle(); 1999 } 2000 } 2001 2002 /** 2003 * Implement this method to intercept hover events before they are handled 2004 * by child views. 2005 * <p> 2006 * This method is called before dispatching a hover event to a child of 2007 * the view group or to the view group's own {@link #onHoverEvent} to allow 2008 * the view group a chance to intercept the hover event. 2009 * This method can also be used to watch all pointer motions that occur within 2010 * the bounds of the view group even when the pointer is hovering over 2011 * a child of the view group rather than over the view group itself. 2012 * </p><p> 2013 * The view group can prevent its children from receiving hover events by 2014 * implementing this method and returning <code>true</code> to indicate 2015 * that it would like to intercept hover events. The view group must 2016 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 2017 * for as long as it wishes to continue intercepting hover events from 2018 * its children. 2019 * </p><p> 2020 * Interception preserves the invariant that at most one view can be 2021 * hovered at a time by transferring hover focus from the currently hovered 2022 * child to the view group or vice-versa as needed. 2023 * </p><p> 2024 * If this method returns <code>true</code> and a child is already hovered, then the 2025 * child view will first receive a hover exit event and then the view group 2026 * itself will receive a hover enter event in {@link #onHoverEvent}. 2027 * Likewise, if this method had previously returned <code>true</code> to intercept hover 2028 * events and instead returns <code>false</code> while the pointer is hovering 2029 * within the bounds of one of a child, then the view group will first receive a 2030 * hover exit event in {@link #onHoverEvent} and then the hovered child will 2031 * receive a hover enter event. 2032 * </p><p> 2033 * The default implementation always returns false. 2034 * </p> 2035 * 2036 * @param event The motion event that describes the hover. 2037 * @return True if the view group would like to intercept the hover event 2038 * and prevent its children from receiving it. 2039 */ 2040 public boolean onInterceptHoverEvent(MotionEvent event) { 2041 return false; 2042 } 2043 2044 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 2045 if (event.getHistorySize() == 0) { 2046 return event; 2047 } 2048 return MotionEvent.obtainNoHistory(event); 2049 } 2050 2051 /** 2052 * {@inheritDoc} 2053 */ 2054 @Override 2055 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 2056 // Send the event to the child under the pointer. 2057 final int childrenCount = mChildrenCount; 2058 if (childrenCount != 0) { 2059 final float x = event.getX(); 2060 final float y = event.getY(); 2061 2062 final ArrayList<View> preorderedList = buildOrderedChildList(); 2063 final boolean customOrder = preorderedList == null 2064 && isChildrenDrawingOrderEnabled(); 2065 final View[] children = mChildren; 2066 for (int i = childrenCount - 1; i >= 0; i--) { 2067 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 2068 final View child = (preorderedList == null) 2069 ? children[childIndex] : preorderedList.get(childIndex); 2070 if (!canViewReceivePointerEvents(child) 2071 || !isTransformedTouchPointInView(x, y, child, null)) { 2072 continue; 2073 } 2074 2075 if (dispatchTransformedGenericPointerEvent(event, child)) { 2076 if (preorderedList != null) preorderedList.clear(); 2077 return true; 2078 } 2079 } 2080 if (preorderedList != null) preorderedList.clear(); 2081 } 2082 2083 // No child handled the event. Send it to this view group. 2084 return super.dispatchGenericPointerEvent(event); 2085 } 2086 2087 /** 2088 * {@inheritDoc} 2089 */ 2090 @Override 2091 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 2092 // Send the event to the focused child or to this view group if it has focus. 2093 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 2094 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 2095 return super.dispatchGenericFocusedEvent(event); 2096 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 2097 == PFLAG_HAS_BOUNDS) { 2098 return mFocused.dispatchGenericMotionEvent(event); 2099 } 2100 return false; 2101 } 2102 2103 /** 2104 * Dispatches a generic pointer event to a child, taking into account 2105 * transformations that apply to the child. 2106 * 2107 * @param event The event to send. 2108 * @param child The view to send the event to. 2109 * @return {@code true} if the child handled the event. 2110 */ 2111 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 2112 final float offsetX = mScrollX - child.mLeft; 2113 final float offsetY = mScrollY - child.mTop; 2114 2115 boolean handled; 2116 if (!child.hasIdentityMatrix()) { 2117 MotionEvent transformedEvent = MotionEvent.obtain(event); 2118 transformedEvent.offsetLocation(offsetX, offsetY); 2119 transformedEvent.transform(child.getInverseMatrix()); 2120 handled = child.dispatchGenericMotionEvent(transformedEvent); 2121 transformedEvent.recycle(); 2122 } else { 2123 event.offsetLocation(offsetX, offsetY); 2124 handled = child.dispatchGenericMotionEvent(event); 2125 event.offsetLocation(-offsetX, -offsetY); 2126 } 2127 return handled; 2128 } 2129 2130 /** 2131 * {@inheritDoc} 2132 */ 2133 @Override 2134 public boolean dispatchTouchEvent(MotionEvent ev) { 2135 if (mInputEventConsistencyVerifier != null) { 2136 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 2137 } 2138 2139 boolean handled = false; 2140 if (onFilterTouchEventForSecurity(ev)) { 2141 final int action = ev.getAction(); 2142 final int actionMasked = action & MotionEvent.ACTION_MASK; 2143 2144 // Handle an initial down. 2145 if (actionMasked == MotionEvent.ACTION_DOWN) { 2146 // Throw away all previous state when starting a new touch gesture. 2147 // The framework may have dropped the up or cancel event for the previous gesture 2148 // due to an app switch, ANR, or some other state change. 2149 cancelAndClearTouchTargets(ev); 2150 resetTouchState(); 2151 } 2152 2153 // Check for interception. 2154 final boolean intercepted; 2155 if (actionMasked == MotionEvent.ACTION_DOWN 2156 || mFirstTouchTarget != null) { 2157 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 2158 if (!disallowIntercept) { 2159 intercepted = onInterceptTouchEvent(ev); 2160 ev.setAction(action); // restore action in case it was changed 2161 } else { 2162 intercepted = false; 2163 } 2164 } else { 2165 // There are no touch targets and this action is not an initial down 2166 // so this view group continues to intercept touches. 2167 intercepted = true; 2168 } 2169 2170 // Check for cancelation. 2171 final boolean canceled = resetCancelNextUpFlag(this) 2172 || actionMasked == MotionEvent.ACTION_CANCEL; 2173 2174 // Update list of touch targets for pointer down, if needed. 2175 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 2176 TouchTarget newTouchTarget = null; 2177 boolean alreadyDispatchedToNewTouchTarget = false; 2178 if (!canceled && !intercepted) { 2179 if (actionMasked == MotionEvent.ACTION_DOWN 2180 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 2181 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 2182 final int actionIndex = ev.getActionIndex(); // always 0 for down 2183 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 2184 : TouchTarget.ALL_POINTER_IDS; 2185 2186 // Clean up earlier touch targets for this pointer id in case they 2187 // have become out of sync. 2188 removePointersFromTouchTargets(idBitsToAssign); 2189 2190 final int childrenCount = mChildrenCount; 2191 if (newTouchTarget == null && childrenCount != 0) { 2192 final float x = ev.getX(actionIndex); 2193 final float y = ev.getY(actionIndex); 2194 // Find a child that can receive the event. 2195 // Scan children from front to back. 2196 final ArrayList<View> preorderedList = buildOrderedChildList(); 2197 final boolean customOrder = preorderedList == null 2198 && isChildrenDrawingOrderEnabled(); 2199 final View[] children = mChildren; 2200 for (int i = childrenCount - 1; i >= 0; i--) { 2201 final int childIndex = customOrder 2202 ? getChildDrawingOrder(childrenCount, i) : i; 2203 final View child = (preorderedList == null) 2204 ? children[childIndex] : preorderedList.get(childIndex); 2205 if (!canViewReceivePointerEvents(child) 2206 || !isTransformedTouchPointInView(x, y, child, null)) { 2207 continue; 2208 } 2209 2210 newTouchTarget = getTouchTarget(child); 2211 if (newTouchTarget != null) { 2212 // Child is already receiving touch within its bounds. 2213 // Give it the new pointer in addition to the ones it is handling. 2214 newTouchTarget.pointerIdBits |= idBitsToAssign; 2215 break; 2216 } 2217 2218 resetCancelNextUpFlag(child); 2219 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 2220 // Child wants to receive touch within its bounds. 2221 mLastTouchDownTime = ev.getDownTime(); 2222 if (preorderedList != null) { 2223 // childIndex points into presorted list, find original index 2224 for (int j = 0; j < childrenCount; j++) { 2225 if (children[childIndex] == mChildren[j]) { 2226 mLastTouchDownIndex = j; 2227 break; 2228 } 2229 } 2230 } else { 2231 mLastTouchDownIndex = childIndex; 2232 } 2233 mLastTouchDownX = ev.getX(); 2234 mLastTouchDownY = ev.getY(); 2235 newTouchTarget = addTouchTarget(child, idBitsToAssign); 2236 alreadyDispatchedToNewTouchTarget = true; 2237 break; 2238 } 2239 } 2240 if (preorderedList != null) preorderedList.clear(); 2241 } 2242 2243 if (newTouchTarget == null && mFirstTouchTarget != null) { 2244 // Did not find a child to receive the event. 2245 // Assign the pointer to the least recently added target. 2246 newTouchTarget = mFirstTouchTarget; 2247 while (newTouchTarget.next != null) { 2248 newTouchTarget = newTouchTarget.next; 2249 } 2250 newTouchTarget.pointerIdBits |= idBitsToAssign; 2251 } 2252 } 2253 } 2254 2255 // Dispatch to touch targets. 2256 if (mFirstTouchTarget == null) { 2257 // No touch targets so treat this as an ordinary view. 2258 handled = dispatchTransformedTouchEvent(ev, canceled, null, 2259 TouchTarget.ALL_POINTER_IDS); 2260 } else { 2261 // Dispatch to touch targets, excluding the new touch target if we already 2262 // dispatched to it. Cancel touch targets if necessary. 2263 TouchTarget predecessor = null; 2264 TouchTarget target = mFirstTouchTarget; 2265 while (target != null) { 2266 final TouchTarget next = target.next; 2267 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 2268 handled = true; 2269 } else { 2270 final boolean cancelChild = resetCancelNextUpFlag(target.child) 2271 || intercepted; 2272 if (dispatchTransformedTouchEvent(ev, cancelChild, 2273 target.child, target.pointerIdBits)) { 2274 handled = true; 2275 } 2276 if (cancelChild) { 2277 if (predecessor == null) { 2278 mFirstTouchTarget = next; 2279 } else { 2280 predecessor.next = next; 2281 } 2282 target.recycle(); 2283 target = next; 2284 continue; 2285 } 2286 } 2287 predecessor = target; 2288 target = next; 2289 } 2290 } 2291 2292 // Update list of touch targets for pointer up or cancel, if needed. 2293 if (canceled 2294 || actionMasked == MotionEvent.ACTION_UP 2295 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 2296 resetTouchState(); 2297 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 2298 final int actionIndex = ev.getActionIndex(); 2299 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 2300 removePointersFromTouchTargets(idBitsToRemove); 2301 } 2302 } 2303 2304 if (!handled && mInputEventConsistencyVerifier != null) { 2305 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 2306 } 2307 return handled; 2308 } 2309 2310 /** 2311 * Resets all touch state in preparation for a new cycle. 2312 */ 2313 private void resetTouchState() { 2314 clearTouchTargets(); 2315 resetCancelNextUpFlag(this); 2316 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2317 mNestedScrollAxes = SCROLL_AXIS_NONE; 2318 } 2319 2320 /** 2321 * Resets the cancel next up flag. 2322 * Returns true if the flag was previously set. 2323 */ 2324 private static boolean resetCancelNextUpFlag(View view) { 2325 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 2326 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 2327 return true; 2328 } 2329 return false; 2330 } 2331 2332 /** 2333 * Clears all touch targets. 2334 */ 2335 private void clearTouchTargets() { 2336 TouchTarget target = mFirstTouchTarget; 2337 if (target != null) { 2338 do { 2339 TouchTarget next = target.next; 2340 target.recycle(); 2341 target = next; 2342 } while (target != null); 2343 mFirstTouchTarget = null; 2344 } 2345 } 2346 2347 /** 2348 * Cancels and clears all touch targets. 2349 */ 2350 private void cancelAndClearTouchTargets(MotionEvent event) { 2351 if (mFirstTouchTarget != null) { 2352 boolean syntheticEvent = false; 2353 if (event == null) { 2354 final long now = SystemClock.uptimeMillis(); 2355 event = MotionEvent.obtain(now, now, 2356 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2357 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2358 syntheticEvent = true; 2359 } 2360 2361 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2362 resetCancelNextUpFlag(target.child); 2363 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2364 } 2365 clearTouchTargets(); 2366 2367 if (syntheticEvent) { 2368 event.recycle(); 2369 } 2370 } 2371 } 2372 2373 /** 2374 * Gets the touch target for specified child view. 2375 * Returns null if not found. 2376 */ 2377 private TouchTarget getTouchTarget(View child) { 2378 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2379 if (target.child == child) { 2380 return target; 2381 } 2382 } 2383 return null; 2384 } 2385 2386 /** 2387 * Adds a touch target for specified child to the beginning of the list. 2388 * Assumes the target child is not already present. 2389 */ 2390 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2391 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2392 target.next = mFirstTouchTarget; 2393 mFirstTouchTarget = target; 2394 return target; 2395 } 2396 2397 /** 2398 * Removes the pointer ids from consideration. 2399 */ 2400 private void removePointersFromTouchTargets(int pointerIdBits) { 2401 TouchTarget predecessor = null; 2402 TouchTarget target = mFirstTouchTarget; 2403 while (target != null) { 2404 final TouchTarget next = target.next; 2405 if ((target.pointerIdBits & pointerIdBits) != 0) { 2406 target.pointerIdBits &= ~pointerIdBits; 2407 if (target.pointerIdBits == 0) { 2408 if (predecessor == null) { 2409 mFirstTouchTarget = next; 2410 } else { 2411 predecessor.next = next; 2412 } 2413 target.recycle(); 2414 target = next; 2415 continue; 2416 } 2417 } 2418 predecessor = target; 2419 target = next; 2420 } 2421 } 2422 2423 private void cancelTouchTarget(View view) { 2424 TouchTarget predecessor = null; 2425 TouchTarget target = mFirstTouchTarget; 2426 while (target != null) { 2427 final TouchTarget next = target.next; 2428 if (target.child == view) { 2429 if (predecessor == null) { 2430 mFirstTouchTarget = next; 2431 } else { 2432 predecessor.next = next; 2433 } 2434 target.recycle(); 2435 2436 final long now = SystemClock.uptimeMillis(); 2437 MotionEvent event = MotionEvent.obtain(now, now, 2438 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2439 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2440 view.dispatchTouchEvent(event); 2441 event.recycle(); 2442 return; 2443 } 2444 predecessor = target; 2445 target = next; 2446 } 2447 } 2448 2449 /** 2450 * Returns true if a child view can receive pointer events. 2451 * @hide 2452 */ 2453 private static boolean canViewReceivePointerEvents(View child) { 2454 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2455 || child.getAnimation() != null; 2456 } 2457 2458 private float[] getTempPoint() { 2459 if (mTempPoint == null) { 2460 mTempPoint = new float[2]; 2461 } 2462 return mTempPoint; 2463 } 2464 2465 /** 2466 * Returns true if a child view contains the specified point when transformed 2467 * into its coordinate space. 2468 * Child must not be null. 2469 * @hide 2470 */ 2471 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2472 PointF outLocalPoint) { 2473 final float[] point = getTempPoint(); 2474 point[0] = x; 2475 point[1] = y; 2476 transformPointToViewLocal(point, child); 2477 final boolean isInView = child.pointInView(point[0], point[1]); 2478 if (isInView && outLocalPoint != null) { 2479 outLocalPoint.set(point[0], point[1]); 2480 } 2481 return isInView; 2482 } 2483 2484 /** 2485 * @hide 2486 */ 2487 public void transformPointToViewLocal(float[] point, View child) { 2488 point[0] += mScrollX - child.mLeft; 2489 point[1] += mScrollY - child.mTop; 2490 2491 if (!child.hasIdentityMatrix()) { 2492 child.getInverseMatrix().mapPoints(point); 2493 } 2494 } 2495 2496 /** 2497 * Transforms a motion event into the coordinate space of a particular child view, 2498 * filters out irrelevant pointer ids, and overrides its action if necessary. 2499 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2500 */ 2501 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2502 View child, int desiredPointerIdBits) { 2503 final boolean handled; 2504 2505 // Canceling motions is a special case. We don't need to perform any transformations 2506 // or filtering. The important part is the action, not the contents. 2507 final int oldAction = event.getAction(); 2508 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2509 event.setAction(MotionEvent.ACTION_CANCEL); 2510 if (child == null) { 2511 handled = super.dispatchTouchEvent(event); 2512 } else { 2513 handled = child.dispatchTouchEvent(event); 2514 } 2515 event.setAction(oldAction); 2516 return handled; 2517 } 2518 2519 // Calculate the number of pointers to deliver. 2520 final int oldPointerIdBits = event.getPointerIdBits(); 2521 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2522 2523 // If for some reason we ended up in an inconsistent state where it looks like we 2524 // might produce a motion event with no pointers in it, then drop the event. 2525 if (newPointerIdBits == 0) { 2526 return false; 2527 } 2528 2529 // If the number of pointers is the same and we don't need to perform any fancy 2530 // irreversible transformations, then we can reuse the motion event for this 2531 // dispatch as long as we are careful to revert any changes we make. 2532 // Otherwise we need to make a copy. 2533 final MotionEvent transformedEvent; 2534 if (newPointerIdBits == oldPointerIdBits) { 2535 if (child == null || child.hasIdentityMatrix()) { 2536 if (child == null) { 2537 handled = super.dispatchTouchEvent(event); 2538 } else { 2539 final float offsetX = mScrollX - child.mLeft; 2540 final float offsetY = mScrollY - child.mTop; 2541 event.offsetLocation(offsetX, offsetY); 2542 2543 handled = child.dispatchTouchEvent(event); 2544 2545 event.offsetLocation(-offsetX, -offsetY); 2546 } 2547 return handled; 2548 } 2549 transformedEvent = MotionEvent.obtain(event); 2550 } else { 2551 transformedEvent = event.split(newPointerIdBits); 2552 } 2553 2554 // Perform any necessary transformations and dispatch. 2555 if (child == null) { 2556 handled = super.dispatchTouchEvent(transformedEvent); 2557 } else { 2558 final float offsetX = mScrollX - child.mLeft; 2559 final float offsetY = mScrollY - child.mTop; 2560 transformedEvent.offsetLocation(offsetX, offsetY); 2561 if (! child.hasIdentityMatrix()) { 2562 transformedEvent.transform(child.getInverseMatrix()); 2563 } 2564 2565 handled = child.dispatchTouchEvent(transformedEvent); 2566 } 2567 2568 // Done. 2569 transformedEvent.recycle(); 2570 return handled; 2571 } 2572 2573 /** 2574 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2575 * dispatch. This behavior is enabled by default for applications that target an 2576 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2577 * 2578 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2579 * views depending on where each pointer initially went down. This allows for user interactions 2580 * such as scrolling two panes of content independently, chording of buttons, and performing 2581 * independent gestures on different pieces of content. 2582 * 2583 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2584 * child views. <code>false</code> to only allow one child view to be the target of 2585 * any MotionEvent received by this ViewGroup. 2586 * @attr ref android.R.styleable#ViewGroup_splitMotionEvents 2587 */ 2588 public void setMotionEventSplittingEnabled(boolean split) { 2589 // TODO Applications really shouldn't change this setting mid-touch event, 2590 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2591 // with gestures in progress when this is changed. 2592 if (split) { 2593 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2594 } else { 2595 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2596 } 2597 } 2598 2599 /** 2600 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2601 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2602 */ 2603 public boolean isMotionEventSplittingEnabled() { 2604 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2605 } 2606 2607 /** 2608 * Returns true if this ViewGroup should be considered as a single entity for removal 2609 * when executing an Activity transition. If this is false, child elements will move 2610 * individually during the transition. 2611 * 2612 * @return True if the ViewGroup should be acted on together during an Activity transition. 2613 * The default value is true when there is a non-null background or if 2614 * {@link #getTransitionName()} is not null or if a 2615 * non-null {@link android.view.ViewOutlineProvider} other than 2616 * {@link android.view.ViewOutlineProvider#BACKGROUND} was given to 2617 * {@link #setOutlineProvider(ViewOutlineProvider)} and false otherwise. 2618 */ 2619 public boolean isTransitionGroup() { 2620 if ((mGroupFlags & FLAG_IS_TRANSITION_GROUP_SET) != 0) { 2621 return ((mGroupFlags & FLAG_IS_TRANSITION_GROUP) != 0); 2622 } else { 2623 final ViewOutlineProvider outlineProvider = getOutlineProvider(); 2624 return getBackground() != null || getTransitionName() != null || 2625 (outlineProvider != null && outlineProvider != ViewOutlineProvider.BACKGROUND); 2626 } 2627 } 2628 2629 /** 2630 * Changes whether or not this ViewGroup should be treated as a single entity during 2631 * Activity Transitions. 2632 * @param isTransitionGroup Whether or not the ViewGroup should be treated as a unit 2633 * in Activity transitions. If false, the ViewGroup won't transition, 2634 * only its children. If true, the entire ViewGroup will transition 2635 * together. 2636 * @see android.app.ActivityOptions#makeSceneTransitionAnimation(android.app.Activity, 2637 * android.util.Pair[]) 2638 */ 2639 public void setTransitionGroup(boolean isTransitionGroup) { 2640 mGroupFlags |= FLAG_IS_TRANSITION_GROUP_SET; 2641 if (isTransitionGroup) { 2642 mGroupFlags |= FLAG_IS_TRANSITION_GROUP; 2643 } else { 2644 mGroupFlags &= ~FLAG_IS_TRANSITION_GROUP; 2645 } 2646 } 2647 2648 /** 2649 * {@inheritDoc} 2650 */ 2651 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2652 2653 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2654 // We're already in this state, assume our ancestors are too 2655 return; 2656 } 2657 2658 if (disallowIntercept) { 2659 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2660 } else { 2661 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2662 } 2663 2664 // Pass it up to our parent 2665 if (mParent != null) { 2666 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2667 } 2668 } 2669 2670 /** 2671 * Implement this method to intercept all touch screen motion events. This 2672 * allows you to watch events as they are dispatched to your children, and 2673 * take ownership of the current gesture at any point. 2674 * 2675 * <p>Using this function takes some care, as it has a fairly complicated 2676 * interaction with {@link View#onTouchEvent(MotionEvent) 2677 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2678 * that method as well as this one in the correct way. Events will be 2679 * received in the following order: 2680 * 2681 * <ol> 2682 * <li> You will receive the down event here. 2683 * <li> The down event will be handled either by a child of this view 2684 * group, or given to your own onTouchEvent() method to handle; this means 2685 * you should implement onTouchEvent() to return true, so you will 2686 * continue to see the rest of the gesture (instead of looking for 2687 * a parent view to handle it). Also, by returning true from 2688 * onTouchEvent(), you will not receive any following 2689 * events in onInterceptTouchEvent() and all touch processing must 2690 * happen in onTouchEvent() like normal. 2691 * <li> For as long as you return false from this function, each following 2692 * event (up to and including the final up) will be delivered first here 2693 * and then to the target's onTouchEvent(). 2694 * <li> If you return true from here, you will not receive any 2695 * following events: the target view will receive the same event but 2696 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2697 * events will be delivered to your onTouchEvent() method and no longer 2698 * appear here. 2699 * </ol> 2700 * 2701 * @param ev The motion event being dispatched down the hierarchy. 2702 * @return Return true to steal motion events from the children and have 2703 * them dispatched to this ViewGroup through onTouchEvent(). 2704 * The current target will receive an ACTION_CANCEL event, and no further 2705 * messages will be delivered here. 2706 */ 2707 public boolean onInterceptTouchEvent(MotionEvent ev) { 2708 return false; 2709 } 2710 2711 /** 2712 * {@inheritDoc} 2713 * 2714 * Looks for a view to give focus to respecting the setting specified by 2715 * {@link #getDescendantFocusability()}. 2716 * 2717 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2718 * find focus within the children of this group when appropriate. 2719 * 2720 * @see #FOCUS_BEFORE_DESCENDANTS 2721 * @see #FOCUS_AFTER_DESCENDANTS 2722 * @see #FOCUS_BLOCK_DESCENDANTS 2723 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2724 */ 2725 @Override 2726 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2727 if (DBG) { 2728 System.out.println(this + " ViewGroup.requestFocus direction=" 2729 + direction); 2730 } 2731 int descendantFocusability = getDescendantFocusability(); 2732 2733 switch (descendantFocusability) { 2734 case FOCUS_BLOCK_DESCENDANTS: 2735 return super.requestFocus(direction, previouslyFocusedRect); 2736 case FOCUS_BEFORE_DESCENDANTS: { 2737 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2738 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2739 } 2740 case FOCUS_AFTER_DESCENDANTS: { 2741 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2742 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2743 } 2744 default: 2745 throw new IllegalStateException("descendant focusability must be " 2746 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2747 + "but is " + descendantFocusability); 2748 } 2749 } 2750 2751 /** 2752 * Look for a descendant to call {@link View#requestFocus} on. 2753 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2754 * when it wants to request focus within its children. Override this to 2755 * customize how your {@link ViewGroup} requests focus within its children. 2756 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2757 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2758 * to give a finer grained hint about where focus is coming from. May be null 2759 * if there is no hint. 2760 * @return Whether focus was taken. 2761 */ 2762 @SuppressWarnings({"ConstantConditions"}) 2763 protected boolean onRequestFocusInDescendants(int direction, 2764 Rect previouslyFocusedRect) { 2765 int index; 2766 int increment; 2767 int end; 2768 int count = mChildrenCount; 2769 if ((direction & FOCUS_FORWARD) != 0) { 2770 index = 0; 2771 increment = 1; 2772 end = count; 2773 } else { 2774 index = count - 1; 2775 increment = -1; 2776 end = -1; 2777 } 2778 final View[] children = mChildren; 2779 for (int i = index; i != end; i += increment) { 2780 View child = children[i]; 2781 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2782 if (child.requestFocus(direction, previouslyFocusedRect)) { 2783 return true; 2784 } 2785 } 2786 } 2787 return false; 2788 } 2789 2790 /** 2791 * {@inheritDoc} 2792 * 2793 * @hide 2794 */ 2795 @Override 2796 public void dispatchStartTemporaryDetach() { 2797 super.dispatchStartTemporaryDetach(); 2798 final int count = mChildrenCount; 2799 final View[] children = mChildren; 2800 for (int i = 0; i < count; i++) { 2801 children[i].dispatchStartTemporaryDetach(); 2802 } 2803 } 2804 2805 /** 2806 * {@inheritDoc} 2807 * 2808 * @hide 2809 */ 2810 @Override 2811 public void dispatchFinishTemporaryDetach() { 2812 super.dispatchFinishTemporaryDetach(); 2813 final int count = mChildrenCount; 2814 final View[] children = mChildren; 2815 for (int i = 0; i < count; i++) { 2816 children[i].dispatchFinishTemporaryDetach(); 2817 } 2818 } 2819 2820 /** 2821 * {@inheritDoc} 2822 */ 2823 @Override 2824 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2825 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2826 super.dispatchAttachedToWindow(info, visibility); 2827 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2828 2829 final int count = mChildrenCount; 2830 final View[] children = mChildren; 2831 for (int i = 0; i < count; i++) { 2832 final View child = children[i]; 2833 child.dispatchAttachedToWindow(info, 2834 visibility | (child.mViewFlags & VISIBILITY_MASK)); 2835 } 2836 } 2837 2838 @Override 2839 void dispatchScreenStateChanged(int screenState) { 2840 super.dispatchScreenStateChanged(screenState); 2841 2842 final int count = mChildrenCount; 2843 final View[] children = mChildren; 2844 for (int i = 0; i < count; i++) { 2845 children[i].dispatchScreenStateChanged(screenState); 2846 } 2847 } 2848 2849 @Override 2850 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2851 boolean handled = false; 2852 if (includeForAccessibility()) { 2853 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2854 if (handled) { 2855 return handled; 2856 } 2857 } 2858 // Let our children have a shot in populating the event. 2859 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2860 try { 2861 final int childCount = children.getChildCount(); 2862 for (int i = 0; i < childCount; i++) { 2863 View child = children.getChildAt(i); 2864 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2865 handled = child.dispatchPopulateAccessibilityEvent(event); 2866 if (handled) { 2867 return handled; 2868 } 2869 } 2870 } 2871 } finally { 2872 children.recycle(); 2873 } 2874 return false; 2875 } 2876 2877 @Override 2878 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2879 super.onInitializeAccessibilityNodeInfoInternal(info); 2880 if (mAttachInfo != null) { 2881 final ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2882 childrenForAccessibility.clear(); 2883 addChildrenForAccessibility(childrenForAccessibility); 2884 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2885 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2886 final View child = childrenForAccessibility.get(i); 2887 info.addChildUnchecked(child); 2888 } 2889 childrenForAccessibility.clear(); 2890 } 2891 } 2892 2893 @Override 2894 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2895 super.onInitializeAccessibilityEventInternal(event); 2896 event.setClassName(ViewGroup.class.getName()); 2897 } 2898 2899 @Override 2900 public void notifySubtreeAccessibilityStateChanged(View child, View source, int changeType) { 2901 // If this is a live region, we should send a subtree change event 2902 // from this view. Otherwise, we can let it propagate up. 2903 if (getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE) { 2904 notifyViewAccessibilityStateChangedIfNeeded(changeType); 2905 } else if (mParent != null) { 2906 try { 2907 mParent.notifySubtreeAccessibilityStateChanged(this, source, changeType); 2908 } catch (AbstractMethodError e) { 2909 Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() + 2910 " does not fully implement ViewParent", e); 2911 } 2912 } 2913 } 2914 2915 @Override 2916 void resetSubtreeAccessibilityStateChanged() { 2917 super.resetSubtreeAccessibilityStateChanged(); 2918 View[] children = mChildren; 2919 final int childCount = mChildrenCount; 2920 for (int i = 0; i < childCount; i++) { 2921 children[i].resetSubtreeAccessibilityStateChanged(); 2922 } 2923 } 2924 2925 /** 2926 * {@inheritDoc} 2927 * 2928 * <p>Subclasses should always call <code>super.onNestedPrePerformAccessibilityAction</code></p> 2929 * 2930 * @param target The target view dispatching this action 2931 * @param action Action being performed; see 2932 * {@link android.view.accessibility.AccessibilityNodeInfo} 2933 * @param args Optional action arguments 2934 * @return false by default. Subclasses should return true if they handle the event. 2935 */ 2936 @Override 2937 public boolean onNestedPrePerformAccessibilityAction(View target, int action, Bundle args) { 2938 return false; 2939 } 2940 2941 /** 2942 * {@inheritDoc} 2943 */ 2944 @Override 2945 void dispatchDetachedFromWindow() { 2946 // If we still have a touch target, we are still in the process of 2947 // dispatching motion events to a child; we need to get rid of that 2948 // child to avoid dispatching events to it after the window is torn 2949 // down. To make sure we keep the child in a consistent state, we 2950 // first send it an ACTION_CANCEL motion event. 2951 cancelAndClearTouchTargets(null); 2952 2953 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2954 exitHoverTargets(); 2955 2956 // In case view is detached while transition is running 2957 mLayoutCalledWhileSuppressed = false; 2958 2959 // Tear down our drag tracking 2960 mDragNotifiedChildren = null; 2961 if (mCurrentDrag != null) { 2962 mCurrentDrag.recycle(); 2963 mCurrentDrag = null; 2964 } 2965 2966 final int count = mChildrenCount; 2967 final View[] children = mChildren; 2968 for (int i = 0; i < count; i++) { 2969 children[i].dispatchDetachedFromWindow(); 2970 } 2971 clearDisappearingChildren(); 2972 super.dispatchDetachedFromWindow(); 2973 } 2974 2975 /** 2976 * @hide 2977 */ 2978 @Override 2979 protected void internalSetPadding(int left, int top, int right, int bottom) { 2980 super.internalSetPadding(left, top, right, bottom); 2981 2982 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2983 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2984 } else { 2985 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2986 } 2987 } 2988 2989 /** 2990 * {@inheritDoc} 2991 */ 2992 @Override 2993 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2994 super.dispatchSaveInstanceState(container); 2995 final int count = mChildrenCount; 2996 final View[] children = mChildren; 2997 for (int i = 0; i < count; i++) { 2998 View c = children[i]; 2999 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 3000 c.dispatchSaveInstanceState(container); 3001 } 3002 } 3003 } 3004 3005 /** 3006 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 3007 * to only this view, not to its children. For use when overriding 3008 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 3009 * subclasses to freeze their own state but not the state of their children. 3010 * 3011 * @param container the container 3012 */ 3013 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 3014 super.dispatchSaveInstanceState(container); 3015 } 3016 3017 /** 3018 * {@inheritDoc} 3019 */ 3020 @Override 3021 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 3022 super.dispatchRestoreInstanceState(container); 3023 final int count = mChildrenCount; 3024 final View[] children = mChildren; 3025 for (int i = 0; i < count; i++) { 3026 View c = children[i]; 3027 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 3028 c.dispatchRestoreInstanceState(container); 3029 } 3030 } 3031 } 3032 3033 /** 3034 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 3035 * to only this view, not to its children. For use when overriding 3036 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 3037 * subclasses to thaw their own state but not the state of their children. 3038 * 3039 * @param container the container 3040 */ 3041 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 3042 super.dispatchRestoreInstanceState(container); 3043 } 3044 3045 /** 3046 * Enables or disables the drawing cache for each child of this view group. 3047 * 3048 * @param enabled true to enable the cache, false to dispose of it 3049 */ 3050 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 3051 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 3052 final View[] children = mChildren; 3053 final int count = mChildrenCount; 3054 for (int i = 0; i < count; i++) { 3055 children[i].setDrawingCacheEnabled(enabled); 3056 } 3057 } 3058 } 3059 3060 @Override 3061 protected void onAnimationStart() { 3062 super.onAnimationStart(); 3063 3064 // When this ViewGroup's animation starts, build the cache for the children 3065 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3066 final int count = mChildrenCount; 3067 final View[] children = mChildren; 3068 final boolean buildCache = !isHardwareAccelerated(); 3069 3070 for (int i = 0; i < count; i++) { 3071 final View child = children[i]; 3072 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 3073 child.setDrawingCacheEnabled(true); 3074 if (buildCache) { 3075 child.buildDrawingCache(true); 3076 } 3077 } 3078 } 3079 3080 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 3081 } 3082 } 3083 3084 @Override 3085 protected void onAnimationEnd() { 3086 super.onAnimationEnd(); 3087 3088 // When this ViewGroup's animation ends, destroy the cache of the children 3089 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3090 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 3091 3092 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 3093 setChildrenDrawingCacheEnabled(false); 3094 } 3095 } 3096 } 3097 3098 @Override 3099 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 3100 int count = mChildrenCount; 3101 int[] visibilities = null; 3102 3103 if (skipChildren) { 3104 visibilities = new int[count]; 3105 for (int i = 0; i < count; i++) { 3106 View child = getChildAt(i); 3107 visibilities[i] = child.getVisibility(); 3108 if (visibilities[i] == View.VISIBLE) { 3109 child.setVisibility(INVISIBLE); 3110 } 3111 } 3112 } 3113 3114 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 3115 3116 if (skipChildren) { 3117 for (int i = 0; i < count; i++) { 3118 getChildAt(i).setVisibility(visibilities[i]); 3119 } 3120 } 3121 3122 return b; 3123 } 3124 3125 /** Return true if this ViewGroup is laying out using optical bounds. */ 3126 boolean isLayoutModeOptical() { 3127 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 3128 } 3129 3130 Insets computeOpticalInsets() { 3131 if (isLayoutModeOptical()) { 3132 int left = 0; 3133 int top = 0; 3134 int right = 0; 3135 int bottom = 0; 3136 for (int i = 0; i < mChildrenCount; i++) { 3137 View child = getChildAt(i); 3138 if (child.getVisibility() == VISIBLE) { 3139 Insets insets = child.getOpticalInsets(); 3140 left = Math.max(left, insets.left); 3141 top = Math.max(top, insets.top); 3142 right = Math.max(right, insets.right); 3143 bottom = Math.max(bottom, insets.bottom); 3144 } 3145 } 3146 return Insets.of(left, top, right, bottom); 3147 } else { 3148 return Insets.NONE; 3149 } 3150 } 3151 3152 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 3153 if (x1 != x2 && y1 != y2) { 3154 if (x1 > x2) { 3155 int tmp = x1; x1 = x2; x2 = tmp; 3156 } 3157 if (y1 > y2) { 3158 int tmp = y1; y1 = y2; y2 = tmp; 3159 } 3160 canvas.drawRect(x1, y1, x2, y2, paint); 3161 } 3162 } 3163 3164 private static int sign(int x) { 3165 return (x >= 0) ? 1 : -1; 3166 } 3167 3168 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 3169 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 3170 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 3171 } 3172 3173 private int dipsToPixels(int dips) { 3174 float scale = getContext().getResources().getDisplayMetrics().density; 3175 return (int) (dips * scale + 0.5f); 3176 } 3177 3178 private static void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 3179 int lineLength, int lineWidth) { 3180 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 3181 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 3182 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 3183 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 3184 } 3185 3186 private static void fillDifference(Canvas canvas, 3187 int x2, int y2, int x3, int y3, 3188 int dx1, int dy1, int dx2, int dy2, Paint paint) { 3189 int x1 = x2 - dx1; 3190 int y1 = y2 - dy1; 3191 3192 int x4 = x3 + dx2; 3193 int y4 = y3 + dy2; 3194 3195 fillRect(canvas, paint, x1, y1, x4, y2); 3196 fillRect(canvas, paint, x1, y2, x2, y3); 3197 fillRect(canvas, paint, x3, y2, x4, y3); 3198 fillRect(canvas, paint, x1, y3, x4, y4); 3199 } 3200 3201 /** 3202 * @hide 3203 */ 3204 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 3205 for (int i = 0; i < getChildCount(); i++) { 3206 View c = getChildAt(i); 3207 c.getLayoutParams().onDebugDraw(c, canvas, paint); 3208 } 3209 } 3210 3211 /** 3212 * @hide 3213 */ 3214 protected void onDebugDraw(Canvas canvas) { 3215 Paint paint = getDebugPaint(); 3216 3217 // Draw optical bounds 3218 { 3219 paint.setColor(Color.RED); 3220 paint.setStyle(Paint.Style.STROKE); 3221 3222 for (int i = 0; i < getChildCount(); i++) { 3223 View c = getChildAt(i); 3224 Insets insets = c.getOpticalInsets(); 3225 3226 drawRect(canvas, paint, 3227 c.getLeft() + insets.left, 3228 c.getTop() + insets.top, 3229 c.getRight() - insets.right - 1, 3230 c.getBottom() - insets.bottom - 1); 3231 } 3232 } 3233 3234 // Draw margins 3235 { 3236 paint.setColor(Color.argb(63, 255, 0, 255)); 3237 paint.setStyle(Paint.Style.FILL); 3238 3239 onDebugDrawMargins(canvas, paint); 3240 } 3241 3242 // Draw clip bounds 3243 { 3244 paint.setColor(Color.rgb(63, 127, 255)); 3245 paint.setStyle(Paint.Style.FILL); 3246 3247 int lineLength = dipsToPixels(8); 3248 int lineWidth = dipsToPixels(1); 3249 for (int i = 0; i < getChildCount(); i++) { 3250 View c = getChildAt(i); 3251 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 3252 paint, lineLength, lineWidth); 3253 } 3254 } 3255 } 3256 3257 /** 3258 * {@inheritDoc} 3259 */ 3260 @Override 3261 protected void dispatchDraw(Canvas canvas) { 3262 boolean usingRenderNodeProperties = canvas.isRecordingFor(mRenderNode); 3263 final int childrenCount = mChildrenCount; 3264 final View[] children = mChildren; 3265 int flags = mGroupFlags; 3266 3267 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 3268 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 3269 3270 final boolean buildCache = !isHardwareAccelerated(); 3271 for (int i = 0; i < childrenCount; i++) { 3272 final View child = children[i]; 3273 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 3274 final LayoutParams params = child.getLayoutParams(); 3275 attachLayoutAnimationParameters(child, params, i, childrenCount); 3276 bindLayoutAnimation(child); 3277 if (cache) { 3278 child.setDrawingCacheEnabled(true); 3279 if (buildCache) { 3280 child.buildDrawingCache(true); 3281 } 3282 } 3283 } 3284 } 3285 3286 final LayoutAnimationController controller = mLayoutAnimationController; 3287 if (controller.willOverlap()) { 3288 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 3289 } 3290 3291 controller.start(); 3292 3293 mGroupFlags &= ~FLAG_RUN_ANIMATION; 3294 mGroupFlags &= ~FLAG_ANIMATION_DONE; 3295 3296 if (cache) { 3297 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 3298 } 3299 3300 if (mAnimationListener != null) { 3301 mAnimationListener.onAnimationStart(controller.getAnimation()); 3302 } 3303 } 3304 3305 int clipSaveCount = 0; 3306 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 3307 if (clipToPadding) { 3308 clipSaveCount = canvas.save(); 3309 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 3310 mScrollX + mRight - mLeft - mPaddingRight, 3311 mScrollY + mBottom - mTop - mPaddingBottom); 3312 } 3313 3314 // We will draw our child's animation, let's reset the flag 3315 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 3316 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 3317 3318 boolean more = false; 3319 final long drawingTime = getDrawingTime(); 3320 3321 if (usingRenderNodeProperties) canvas.insertReorderBarrier(); 3322 // Only use the preordered list if not HW accelerated, since the HW pipeline will do the 3323 // draw reordering internally 3324 final ArrayList<View> preorderedList = usingRenderNodeProperties 3325 ? null : buildOrderedChildList(); 3326 final boolean customOrder = preorderedList == null 3327 && isChildrenDrawingOrderEnabled(); 3328 for (int i = 0; i < childrenCount; i++) { 3329 int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 3330 final View child = (preorderedList == null) 3331 ? children[childIndex] : preorderedList.get(childIndex); 3332 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 3333 more |= drawChild(canvas, child, drawingTime); 3334 } 3335 } 3336 if (preorderedList != null) preorderedList.clear(); 3337 3338 // Draw any disappearing views that have animations 3339 if (mDisappearingChildren != null) { 3340 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3341 final int disappearingCount = disappearingChildren.size() - 1; 3342 // Go backwards -- we may delete as animations finish 3343 for (int i = disappearingCount; i >= 0; i--) { 3344 final View child = disappearingChildren.get(i); 3345 more |= drawChild(canvas, child, drawingTime); 3346 } 3347 } 3348 if (usingRenderNodeProperties) canvas.insertInorderBarrier(); 3349 3350 if (debugDraw()) { 3351 onDebugDraw(canvas); 3352 } 3353 3354 if (clipToPadding) { 3355 canvas.restoreToCount(clipSaveCount); 3356 } 3357 3358 // mGroupFlags might have been updated by drawChild() 3359 flags = mGroupFlags; 3360 3361 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 3362 invalidate(true); 3363 } 3364 3365 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 3366 mLayoutAnimationController.isDone() && !more) { 3367 // We want to erase the drawing cache and notify the listener after the 3368 // next frame is drawn because one extra invalidate() is caused by 3369 // drawChild() after the animation is over 3370 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 3371 final Runnable end = new Runnable() { 3372 public void run() { 3373 notifyAnimationListener(); 3374 } 3375 }; 3376 post(end); 3377 } 3378 } 3379 3380 /** 3381 * Returns the ViewGroupOverlay for this view group, creating it if it does 3382 * not yet exist. In addition to {@link ViewOverlay}'s support for drawables, 3383 * {@link ViewGroupOverlay} allows views to be added to the overlay. These 3384 * views, like overlay drawables, are visual-only; they do not receive input 3385 * events and should not be used as anything other than a temporary 3386 * representation of a view in a parent container, such as might be used 3387 * by an animation effect. 3388 * 3389 * <p>Note: Overlays do not currently work correctly with {@link 3390 * SurfaceView} or {@link TextureView}; contents in overlays for these 3391 * types of views may not display correctly.</p> 3392 * 3393 * @return The ViewGroupOverlay object for this view. 3394 * @see ViewGroupOverlay 3395 */ 3396 @Override 3397 public ViewGroupOverlay getOverlay() { 3398 if (mOverlay == null) { 3399 mOverlay = new ViewGroupOverlay(mContext, this); 3400 } 3401 return (ViewGroupOverlay) mOverlay; 3402 } 3403 3404 /** 3405 * Returns the index of the child to draw for this iteration. Override this 3406 * if you want to change the drawing order of children. By default, it 3407 * returns i. 3408 * <p> 3409 * NOTE: In order for this method to be called, you must enable child ordering 3410 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 3411 * 3412 * @param i The current iteration. 3413 * @return The index of the child to draw this iteration. 3414 * 3415 * @see #setChildrenDrawingOrderEnabled(boolean) 3416 * @see #isChildrenDrawingOrderEnabled() 3417 */ 3418 protected int getChildDrawingOrder(int childCount, int i) { 3419 return i; 3420 } 3421 3422 private boolean hasChildWithZ() { 3423 for (int i = 0; i < mChildrenCount; i++) { 3424 if (mChildren[i].getZ() != 0) return true; 3425 } 3426 return false; 3427 } 3428 3429 /** 3430 * Populates (and returns) mPreSortedChildren with a pre-ordered list of the View's children, 3431 * sorted first by Z, then by child drawing order (if applicable). This list must be cleared 3432 * after use to avoid leaking child Views. 3433 * 3434 * Uses a stable, insertion sort which is commonly O(n) for ViewGroups with very few elevated 3435 * children. 3436 */ 3437 ArrayList<View> buildOrderedChildList() { 3438 final int count = mChildrenCount; 3439 if (count <= 1 || !hasChildWithZ()) return null; 3440 3441 if (mPreSortedChildren == null) { 3442 mPreSortedChildren = new ArrayList<View>(count); 3443 } else { 3444 mPreSortedChildren.ensureCapacity(count); 3445 } 3446 3447 final boolean useCustomOrder = isChildrenDrawingOrderEnabled(); 3448 for (int i = 0; i < mChildrenCount; i++) { 3449 // add next child (in child order) to end of list 3450 int childIndex = useCustomOrder ? getChildDrawingOrder(mChildrenCount, i) : i; 3451 View nextChild = mChildren[childIndex]; 3452 float currentZ = nextChild.getZ(); 3453 3454 // insert ahead of any Views with greater Z 3455 int insertIndex = i; 3456 while (insertIndex > 0 && mPreSortedChildren.get(insertIndex - 1).getZ() > currentZ) { 3457 insertIndex--; 3458 } 3459 mPreSortedChildren.add(insertIndex, nextChild); 3460 } 3461 return mPreSortedChildren; 3462 } 3463 3464 private void notifyAnimationListener() { 3465 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 3466 mGroupFlags |= FLAG_ANIMATION_DONE; 3467 3468 if (mAnimationListener != null) { 3469 final Runnable end = new Runnable() { 3470 public void run() { 3471 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 3472 } 3473 }; 3474 post(end); 3475 } 3476 3477 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 3478 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 3479 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 3480 setChildrenDrawingCacheEnabled(false); 3481 } 3482 } 3483 3484 invalidate(true); 3485 } 3486 3487 /** 3488 * This method is used to cause children of this ViewGroup to restore or recreate their 3489 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 3490 * to recreate its own display list, which would happen if it went through the normal 3491 * draw/dispatchDraw mechanisms. 3492 * 3493 * @hide 3494 */ 3495 @Override 3496 protected void dispatchGetDisplayList() { 3497 final int count = mChildrenCount; 3498 final View[] children = mChildren; 3499 for (int i = 0; i < count; i++) { 3500 final View child = children[i]; 3501 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 3502 child.hasStaticLayer()) { 3503 recreateChildDisplayList(child); 3504 } 3505 } 3506 if (mOverlay != null) { 3507 View overlayView = mOverlay.getOverlayView(); 3508 recreateChildDisplayList(overlayView); 3509 } 3510 if (mDisappearingChildren != null) { 3511 final ArrayList<View> disappearingChildren = mDisappearingChildren; 3512 final int disappearingCount = disappearingChildren.size(); 3513 for (int i = 0; i < disappearingCount; ++i) { 3514 final View child = disappearingChildren.get(i); 3515 recreateChildDisplayList(child); 3516 } 3517 } 3518 } 3519 3520 private void recreateChildDisplayList(View child) { 3521 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 3522 == PFLAG_INVALIDATED; 3523 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3524 child.getDisplayList(); 3525 child.mRecreateDisplayList = false; 3526 } 3527 3528 /** 3529 * Draw one child of this View Group. This method is responsible for getting 3530 * the canvas in the right state. This includes clipping, translating so 3531 * that the child's scrolled origin is at 0, 0, and applying any animation 3532 * transformations. 3533 * 3534 * @param canvas The canvas on which to draw the child 3535 * @param child Who to draw 3536 * @param drawingTime The time at which draw is occurring 3537 * @return True if an invalidate() was issued 3538 */ 3539 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3540 return child.draw(canvas, this, drawingTime); 3541 } 3542 3543 /** 3544 * Returns whether this group's children are clipped to their bounds before drawing. 3545 * The default value is true. 3546 * @see #setClipChildren(boolean) 3547 * 3548 * @return True if the group's children will be clipped to their bounds, 3549 * false otherwise. 3550 */ 3551 @ViewDebug.ExportedProperty(category = "drawing") 3552 public boolean getClipChildren() { 3553 return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0); 3554 } 3555 3556 /** 3557 * By default, children are clipped to their bounds before drawing. This 3558 * allows view groups to override this behavior for animations, etc. 3559 * 3560 * @param clipChildren true to clip children to their bounds, 3561 * false otherwise 3562 * @attr ref android.R.styleable#ViewGroup_clipChildren 3563 */ 3564 public void setClipChildren(boolean clipChildren) { 3565 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3566 if (clipChildren != previousValue) { 3567 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3568 for (int i = 0; i < mChildrenCount; ++i) { 3569 View child = getChildAt(i); 3570 if (child.mRenderNode != null) { 3571 child.mRenderNode.setClipToBounds(clipChildren); 3572 } 3573 } 3574 invalidate(true); 3575 } 3576 } 3577 3578 /** 3579 * Sets whether this ViewGroup will clip its children to its padding, if 3580 * padding is present. 3581 * <p> 3582 * By default, children are clipped to the padding of their parent 3583 * Viewgroup. This clipping behavior is only enabled if padding is non-zero. 3584 * 3585 * @param clipToPadding true to clip children to the padding of the 3586 * group, false otherwise 3587 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3588 */ 3589 public void setClipToPadding(boolean clipToPadding) { 3590 if (hasBooleanFlag(FLAG_CLIP_TO_PADDING) != clipToPadding) { 3591 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3592 invalidate(true); 3593 } 3594 } 3595 3596 /** 3597 * Returns whether this ViewGroup will clip its children to its padding, if 3598 * padding is present. 3599 * <p> 3600 * By default, children are clipped to the padding of their parent 3601 * Viewgroup. This clipping behavior is only enabled if padding is non-zero. 3602 * 3603 * @return true if this ViewGroup clips children to its padding, false otherwise 3604 * 3605 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3606 */ 3607 @ViewDebug.ExportedProperty(category = "drawing") 3608 public boolean getClipToPadding() { 3609 return hasBooleanFlag(FLAG_CLIP_TO_PADDING); 3610 } 3611 3612 /** 3613 * {@inheritDoc} 3614 */ 3615 @Override 3616 public void dispatchSetSelected(boolean selected) { 3617 final View[] children = mChildren; 3618 final int count = mChildrenCount; 3619 for (int i = 0; i < count; i++) { 3620 children[i].setSelected(selected); 3621 } 3622 } 3623 3624 /** 3625 * {@inheritDoc} 3626 */ 3627 @Override 3628 public void dispatchSetActivated(boolean activated) { 3629 final View[] children = mChildren; 3630 final int count = mChildrenCount; 3631 for (int i = 0; i < count; i++) { 3632 children[i].setActivated(activated); 3633 } 3634 } 3635 3636 @Override 3637 protected void dispatchSetPressed(boolean pressed) { 3638 final View[] children = mChildren; 3639 final int count = mChildrenCount; 3640 for (int i = 0; i < count; i++) { 3641 final View child = children[i]; 3642 // Children that are clickable on their own should not 3643 // show a pressed state when their parent view does. 3644 // Clearing a pressed state always propagates. 3645 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3646 child.setPressed(pressed); 3647 } 3648 } 3649 } 3650 3651 /** 3652 * Dispatches drawable hotspot changes to child views that meet at least 3653 * one of the following criteria: 3654 * <ul> 3655 * <li>Returns {@code false} from both {@link View#isClickable()} and 3656 * {@link View#isLongClickable()}</li> 3657 * <li>Requests duplication of parent state via 3658 * {@link View#setDuplicateParentStateEnabled(boolean)}</li> 3659 * </ul> 3660 * 3661 * @param x hotspot x coordinate 3662 * @param y hotspot y coordinate 3663 * @see #drawableHotspotChanged(float, float) 3664 */ 3665 @Override 3666 public void dispatchDrawableHotspotChanged(float x, float y) { 3667 final int count = mChildrenCount; 3668 if (count == 0) { 3669 return; 3670 } 3671 3672 final View[] children = mChildren; 3673 for (int i = 0; i < count; i++) { 3674 final View child = children[i]; 3675 // Children that are clickable on their own should not 3676 // receive hotspots when their parent view does. 3677 final boolean nonActionable = !child.isClickable() && !child.isLongClickable(); 3678 final boolean duplicatesState = (child.mViewFlags & DUPLICATE_PARENT_STATE) != 0; 3679 if (nonActionable || duplicatesState) { 3680 final float[] point = getTempPoint(); 3681 point[0] = x; 3682 point[1] = y; 3683 transformPointToViewLocal(point, child); 3684 child.drawableHotspotChanged(point[0], point[1]); 3685 } 3686 } 3687 } 3688 3689 @Override 3690 void dispatchCancelPendingInputEvents() { 3691 super.dispatchCancelPendingInputEvents(); 3692 3693 final View[] children = mChildren; 3694 final int count = mChildrenCount; 3695 for (int i = 0; i < count; i++) { 3696 children[i].dispatchCancelPendingInputEvents(); 3697 } 3698 } 3699 3700 /** 3701 * When this property is set to true, this ViewGroup supports static transformations on 3702 * children; this causes 3703 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3704 * invoked when a child is drawn. 3705 * 3706 * Any subclass overriding 3707 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3708 * set this property to true. 3709 * 3710 * @param enabled True to enable static transformations on children, false otherwise. 3711 * 3712 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3713 */ 3714 protected void setStaticTransformationsEnabled(boolean enabled) { 3715 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3716 } 3717 3718 /** 3719 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3720 * boolean to indicate whether a static transform was set. The default implementation 3721 * simply returns <code>false</code>; subclasses may override this method for different 3722 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3723 * for this method to be called. 3724 * 3725 * @param child The child view whose static transform is being requested 3726 * @param t The Transformation which will hold the result 3727 * @return true if the transformation was set, false otherwise 3728 * @see #setStaticTransformationsEnabled(boolean) 3729 */ 3730 protected boolean getChildStaticTransformation(View child, Transformation t) { 3731 return false; 3732 } 3733 3734 Transformation getChildTransformation() { 3735 if (mChildTransformation == null) { 3736 mChildTransformation = new Transformation(); 3737 } 3738 return mChildTransformation; 3739 } 3740 3741 /** 3742 * {@hide} 3743 */ 3744 @Override 3745 protected View findViewTraversal(int id) { 3746 if (id == mID) { 3747 return this; 3748 } 3749 3750 final View[] where = mChildren; 3751 final int len = mChildrenCount; 3752 3753 for (int i = 0; i < len; i++) { 3754 View v = where[i]; 3755 3756 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3757 v = v.findViewById(id); 3758 3759 if (v != null) { 3760 return v; 3761 } 3762 } 3763 } 3764 3765 return null; 3766 } 3767 3768 /** 3769 * {@hide} 3770 */ 3771 @Override 3772 protected View findViewWithTagTraversal(Object tag) { 3773 if (tag != null && tag.equals(mTag)) { 3774 return this; 3775 } 3776 3777 final View[] where = mChildren; 3778 final int len = mChildrenCount; 3779 3780 for (int i = 0; i < len; i++) { 3781 View v = where[i]; 3782 3783 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3784 v = v.findViewWithTag(tag); 3785 3786 if (v != null) { 3787 return v; 3788 } 3789 } 3790 } 3791 3792 return null; 3793 } 3794 3795 /** 3796 * {@hide} 3797 */ 3798 @Override 3799 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3800 if (predicate.apply(this)) { 3801 return this; 3802 } 3803 3804 final View[] where = mChildren; 3805 final int len = mChildrenCount; 3806 3807 for (int i = 0; i < len; i++) { 3808 View v = where[i]; 3809 3810 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3811 v = v.findViewByPredicate(predicate); 3812 3813 if (v != null) { 3814 return v; 3815 } 3816 } 3817 } 3818 3819 return null; 3820 } 3821 3822 /** 3823 * <p>Adds a child view. If no layout parameters are already set on the child, the 3824 * default parameters for this ViewGroup are set on the child.</p> 3825 * 3826 * <p><strong>Note:</strong> do not invoke this method from 3827 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3828 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3829 * 3830 * @param child the child view to add 3831 * 3832 * @see #generateDefaultLayoutParams() 3833 */ 3834 public void addView(View child) { 3835 addView(child, -1); 3836 } 3837 3838 /** 3839 * Adds a child view. If no layout parameters are already set on the child, the 3840 * default parameters for this ViewGroup are set on the child. 3841 * 3842 * <p><strong>Note:</strong> do not invoke this method from 3843 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3844 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3845 * 3846 * @param child the child view to add 3847 * @param index the position at which to add the child 3848 * 3849 * @see #generateDefaultLayoutParams() 3850 */ 3851 public void addView(View child, int index) { 3852 if (child == null) { 3853 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 3854 } 3855 LayoutParams params = child.getLayoutParams(); 3856 if (params == null) { 3857 params = generateDefaultLayoutParams(); 3858 if (params == null) { 3859 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3860 } 3861 } 3862 addView(child, index, params); 3863 } 3864 3865 /** 3866 * Adds a child view with this ViewGroup's default layout parameters and the 3867 * specified width and height. 3868 * 3869 * <p><strong>Note:</strong> do not invoke this method from 3870 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3871 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3872 * 3873 * @param child the child view to add 3874 */ 3875 public void addView(View child, int width, int height) { 3876 final LayoutParams params = generateDefaultLayoutParams(); 3877 params.width = width; 3878 params.height = height; 3879 addView(child, -1, params); 3880 } 3881 3882 /** 3883 * Adds a child view with the specified layout parameters. 3884 * 3885 * <p><strong>Note:</strong> do not invoke this method from 3886 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3887 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3888 * 3889 * @param child the child view to add 3890 * @param params the layout parameters to set on the child 3891 */ 3892 public void addView(View child, LayoutParams params) { 3893 addView(child, -1, params); 3894 } 3895 3896 /** 3897 * Adds a child view with the specified layout parameters. 3898 * 3899 * <p><strong>Note:</strong> do not invoke this method from 3900 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3901 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3902 * 3903 * @param child the child view to add 3904 * @param index the position at which to add the child 3905 * @param params the layout parameters to set on the child 3906 */ 3907 public void addView(View child, int index, LayoutParams params) { 3908 if (DBG) { 3909 System.out.println(this + " addView"); 3910 } 3911 3912 if (child == null) { 3913 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 3914 } 3915 3916 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3917 // therefore, we call requestLayout() on ourselves before, so that the child's request 3918 // will be blocked at our level 3919 requestLayout(); 3920 invalidate(true); 3921 addViewInner(child, index, params, false); 3922 } 3923 3924 /** 3925 * {@inheritDoc} 3926 */ 3927 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3928 if (!checkLayoutParams(params)) { 3929 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3930 } 3931 if (view.mParent != this) { 3932 throw new IllegalArgumentException("Given view not a child of " + this); 3933 } 3934 view.setLayoutParams(params); 3935 } 3936 3937 /** 3938 * {@inheritDoc} 3939 */ 3940 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3941 return p != null; 3942 } 3943 3944 /** 3945 * Interface definition for a callback to be invoked when the hierarchy 3946 * within this view changed. The hierarchy changes whenever a child is added 3947 * to or removed from this view. 3948 */ 3949 public interface OnHierarchyChangeListener { 3950 /** 3951 * Called when a new child is added to a parent view. 3952 * 3953 * @param parent the view in which a child was added 3954 * @param child the new child view added in the hierarchy 3955 */ 3956 void onChildViewAdded(View parent, View child); 3957 3958 /** 3959 * Called when a child is removed from a parent view. 3960 * 3961 * @param parent the view from which the child was removed 3962 * @param child the child removed from the hierarchy 3963 */ 3964 void onChildViewRemoved(View parent, View child); 3965 } 3966 3967 /** 3968 * Register a callback to be invoked when a child is added to or removed 3969 * from this view. 3970 * 3971 * @param listener the callback to invoke on hierarchy change 3972 */ 3973 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3974 mOnHierarchyChangeListener = listener; 3975 } 3976 3977 /** 3978 * @hide 3979 */ 3980 protected void onViewAdded(View child) { 3981 if (mOnHierarchyChangeListener != null) { 3982 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3983 } 3984 } 3985 3986 /** 3987 * @hide 3988 */ 3989 protected void onViewRemoved(View child) { 3990 if (mOnHierarchyChangeListener != null) { 3991 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3992 } 3993 } 3994 3995 private void clearCachedLayoutMode() { 3996 if (!hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 3997 mLayoutMode = LAYOUT_MODE_UNDEFINED; 3998 } 3999 } 4000 4001 @Override 4002 protected void onAttachedToWindow() { 4003 super.onAttachedToWindow(); 4004 clearCachedLayoutMode(); 4005 } 4006 4007 @Override 4008 protected void onDetachedFromWindow() { 4009 super.onDetachedFromWindow(); 4010 clearCachedLayoutMode(); 4011 } 4012 4013 /** 4014 * Adds a view during layout. This is useful if in your onLayout() method, 4015 * you need to add more views (as does the list view for example). 4016 * 4017 * If index is negative, it means put it at the end of the list. 4018 * 4019 * @param child the view to add to the group 4020 * @param index the index at which the child must be added 4021 * @param params the layout parameters to associate with the child 4022 * @return true if the child was added, false otherwise 4023 */ 4024 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 4025 return addViewInLayout(child, index, params, false); 4026 } 4027 4028 /** 4029 * Adds a view during layout. This is useful if in your onLayout() method, 4030 * you need to add more views (as does the list view for example). 4031 * 4032 * If index is negative, it means put it at the end of the list. 4033 * 4034 * @param child the view to add to the group 4035 * @param index the index at which the child must be added 4036 * @param params the layout parameters to associate with the child 4037 * @param preventRequestLayout if true, calling this method will not trigger a 4038 * layout request on child 4039 * @return true if the child was added, false otherwise 4040 */ 4041 protected boolean addViewInLayout(View child, int index, LayoutParams params, 4042 boolean preventRequestLayout) { 4043 if (child == null) { 4044 throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup"); 4045 } 4046 child.mParent = null; 4047 addViewInner(child, index, params, preventRequestLayout); 4048 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 4049 return true; 4050 } 4051 4052 /** 4053 * Prevents the specified child to be laid out during the next layout pass. 4054 * 4055 * @param child the child on which to perform the cleanup 4056 */ 4057 protected void cleanupLayoutState(View child) { 4058 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 4059 } 4060 4061 private void addViewInner(View child, int index, LayoutParams params, 4062 boolean preventRequestLayout) { 4063 4064 if (mTransition != null) { 4065 // Don't prevent other add transitions from completing, but cancel remove 4066 // transitions to let them complete the process before we add to the container 4067 mTransition.cancel(LayoutTransition.DISAPPEARING); 4068 } 4069 4070 if (child.getParent() != null) { 4071 throw new IllegalStateException("The specified child already has a parent. " + 4072 "You must call removeView() on the child's parent first."); 4073 } 4074 4075 if (mTransition != null) { 4076 mTransition.addChild(this, child); 4077 } 4078 4079 if (!checkLayoutParams(params)) { 4080 params = generateLayoutParams(params); 4081 } 4082 4083 if (preventRequestLayout) { 4084 child.mLayoutParams = params; 4085 } else { 4086 child.setLayoutParams(params); 4087 } 4088 4089 if (index < 0) { 4090 index = mChildrenCount; 4091 } 4092 4093 addInArray(child, index); 4094 4095 // tell our children 4096 if (preventRequestLayout) { 4097 child.assignParent(this); 4098 } else { 4099 child.mParent = this; 4100 } 4101 4102 if (child.hasFocus()) { 4103 requestChildFocus(child, child.findFocus()); 4104 } 4105 4106 AttachInfo ai = mAttachInfo; 4107 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 4108 boolean lastKeepOn = ai.mKeepScreenOn; 4109 ai.mKeepScreenOn = false; 4110 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 4111 if (ai.mKeepScreenOn) { 4112 needGlobalAttributesUpdate(true); 4113 } 4114 ai.mKeepScreenOn = lastKeepOn; 4115 } 4116 4117 if (child.isLayoutDirectionInherited()) { 4118 child.resetRtlProperties(); 4119 } 4120 4121 onViewAdded(child); 4122 4123 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 4124 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 4125 } 4126 4127 if (child.hasTransientState()) { 4128 childHasTransientStateChanged(child, true); 4129 } 4130 4131 if (child.getVisibility() != View.GONE) { 4132 notifySubtreeAccessibilityStateChangedIfNeeded(); 4133 } 4134 } 4135 4136 private void addInArray(View child, int index) { 4137 View[] children = mChildren; 4138 final int count = mChildrenCount; 4139 final int size = children.length; 4140 if (index == count) { 4141 if (size == count) { 4142 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 4143 System.arraycopy(children, 0, mChildren, 0, size); 4144 children = mChildren; 4145 } 4146 children[mChildrenCount++] = child; 4147 } else if (index < count) { 4148 if (size == count) { 4149 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 4150 System.arraycopy(children, 0, mChildren, 0, index); 4151 System.arraycopy(children, index, mChildren, index + 1, count - index); 4152 children = mChildren; 4153 } else { 4154 System.arraycopy(children, index, children, index + 1, count - index); 4155 } 4156 children[index] = child; 4157 mChildrenCount++; 4158 if (mLastTouchDownIndex >= index) { 4159 mLastTouchDownIndex++; 4160 } 4161 } else { 4162 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 4163 } 4164 } 4165 4166 // This method also sets the child's mParent to null 4167 private void removeFromArray(int index) { 4168 final View[] children = mChildren; 4169 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 4170 children[index].mParent = null; 4171 } 4172 final int count = mChildrenCount; 4173 if (index == count - 1) { 4174 children[--mChildrenCount] = null; 4175 } else if (index >= 0 && index < count) { 4176 System.arraycopy(children, index + 1, children, index, count - index - 1); 4177 children[--mChildrenCount] = null; 4178 } else { 4179 throw new IndexOutOfBoundsException(); 4180 } 4181 if (mLastTouchDownIndex == index) { 4182 mLastTouchDownTime = 0; 4183 mLastTouchDownIndex = -1; 4184 } else if (mLastTouchDownIndex > index) { 4185 mLastTouchDownIndex--; 4186 } 4187 } 4188 4189 // This method also sets the children's mParent to null 4190 private void removeFromArray(int start, int count) { 4191 final View[] children = mChildren; 4192 final int childrenCount = mChildrenCount; 4193 4194 start = Math.max(0, start); 4195 final int end = Math.min(childrenCount, start + count); 4196 4197 if (start == end) { 4198 return; 4199 } 4200 4201 if (end == childrenCount) { 4202 for (int i = start; i < end; i++) { 4203 children[i].mParent = null; 4204 children[i] = null; 4205 } 4206 } else { 4207 for (int i = start; i < end; i++) { 4208 children[i].mParent = null; 4209 } 4210 4211 // Since we're looping above, we might as well do the copy, but is arraycopy() 4212 // faster than the extra 2 bounds checks we would do in the loop? 4213 System.arraycopy(children, end, children, start, childrenCount - end); 4214 4215 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 4216 children[i] = null; 4217 } 4218 } 4219 4220 mChildrenCount -= (end - start); 4221 } 4222 4223 private void bindLayoutAnimation(View child) { 4224 Animation a = mLayoutAnimationController.getAnimationForView(child); 4225 child.setAnimation(a); 4226 } 4227 4228 /** 4229 * Subclasses should override this method to set layout animation 4230 * parameters on the supplied child. 4231 * 4232 * @param child the child to associate with animation parameters 4233 * @param params the child's layout parameters which hold the animation 4234 * parameters 4235 * @param index the index of the child in the view group 4236 * @param count the number of children in the view group 4237 */ 4238 protected void attachLayoutAnimationParameters(View child, 4239 LayoutParams params, int index, int count) { 4240 LayoutAnimationController.AnimationParameters animationParams = 4241 params.layoutAnimationParameters; 4242 if (animationParams == null) { 4243 animationParams = new LayoutAnimationController.AnimationParameters(); 4244 params.layoutAnimationParameters = animationParams; 4245 } 4246 4247 animationParams.count = count; 4248 animationParams.index = index; 4249 } 4250 4251 /** 4252 * {@inheritDoc} 4253 * 4254 * <p><strong>Note:</strong> do not invoke this method from 4255 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4256 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4257 */ 4258 public void removeView(View view) { 4259 if (removeViewInternal(view)) { 4260 requestLayout(); 4261 invalidate(true); 4262 } 4263 } 4264 4265 /** 4266 * Removes a view during layout. This is useful if in your onLayout() method, 4267 * you need to remove more views. 4268 * 4269 * <p><strong>Note:</strong> do not invoke this method from 4270 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4271 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4272 * 4273 * @param view the view to remove from the group 4274 */ 4275 public void removeViewInLayout(View view) { 4276 removeViewInternal(view); 4277 } 4278 4279 /** 4280 * Removes a range of views during layout. This is useful if in your onLayout() method, 4281 * you need to remove more views. 4282 * 4283 * <p><strong>Note:</strong> do not invoke this method from 4284 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4285 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4286 * 4287 * @param start the index of the first view to remove from the group 4288 * @param count the number of views to remove from the group 4289 */ 4290 public void removeViewsInLayout(int start, int count) { 4291 removeViewsInternal(start, count); 4292 } 4293 4294 /** 4295 * Removes the view at the specified position in the group. 4296 * 4297 * <p><strong>Note:</strong> do not invoke this method from 4298 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4299 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4300 * 4301 * @param index the position in the group of the view to remove 4302 */ 4303 public void removeViewAt(int index) { 4304 removeViewInternal(index, getChildAt(index)); 4305 requestLayout(); 4306 invalidate(true); 4307 } 4308 4309 /** 4310 * Removes the specified range of views from the group. 4311 * 4312 * <p><strong>Note:</strong> do not invoke this method from 4313 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4314 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4315 * 4316 * @param start the first position in the group of the range of views to remove 4317 * @param count the number of views to remove 4318 */ 4319 public void removeViews(int start, int count) { 4320 removeViewsInternal(start, count); 4321 requestLayout(); 4322 invalidate(true); 4323 } 4324 4325 private boolean removeViewInternal(View view) { 4326 final int index = indexOfChild(view); 4327 if (index >= 0) { 4328 removeViewInternal(index, view); 4329 return true; 4330 } 4331 return false; 4332 } 4333 4334 private void removeViewInternal(int index, View view) { 4335 4336 if (mTransition != null) { 4337 mTransition.removeChild(this, view); 4338 } 4339 4340 boolean clearChildFocus = false; 4341 if (view == mFocused) { 4342 view.unFocus(null); 4343 clearChildFocus = true; 4344 } 4345 4346 view.clearAccessibilityFocus(); 4347 4348 cancelTouchTarget(view); 4349 cancelHoverTarget(view); 4350 4351 if (view.getAnimation() != null || 4352 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4353 addDisappearingView(view); 4354 } else if (view.mAttachInfo != null) { 4355 view.dispatchDetachedFromWindow(); 4356 } 4357 4358 if (view.hasTransientState()) { 4359 childHasTransientStateChanged(view, false); 4360 } 4361 4362 needGlobalAttributesUpdate(false); 4363 4364 removeFromArray(index); 4365 4366 if (clearChildFocus) { 4367 clearChildFocus(view); 4368 if (!rootViewRequestFocus()) { 4369 notifyGlobalFocusCleared(this); 4370 } 4371 } 4372 4373 onViewRemoved(view); 4374 4375 if (view.getVisibility() != View.GONE) { 4376 notifySubtreeAccessibilityStateChangedIfNeeded(); 4377 } 4378 } 4379 4380 /** 4381 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 4382 * not null, changes in layout which occur because of children being added to or removed from 4383 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 4384 * object. By default, the transition object is null (so layout changes are not animated). 4385 * 4386 * <p>Replacing a non-null transition will cause that previous transition to be 4387 * canceled, if it is currently running, to restore this container to 4388 * its correct post-transition state.</p> 4389 * 4390 * @param transition The LayoutTransition object that will animated changes in layout. A value 4391 * of <code>null</code> means no transition will run on layout changes. 4392 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 4393 */ 4394 public void setLayoutTransition(LayoutTransition transition) { 4395 if (mTransition != null) { 4396 LayoutTransition previousTransition = mTransition; 4397 previousTransition.cancel(); 4398 previousTransition.removeTransitionListener(mLayoutTransitionListener); 4399 } 4400 mTransition = transition; 4401 if (mTransition != null) { 4402 mTransition.addTransitionListener(mLayoutTransitionListener); 4403 } 4404 } 4405 4406 /** 4407 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 4408 * not null, changes in layout which occur because of children being added to or removed from 4409 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 4410 * object. By default, the transition object is null (so layout changes are not animated). 4411 * 4412 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 4413 * A value of <code>null</code> means no transition will run on layout changes. 4414 */ 4415 public LayoutTransition getLayoutTransition() { 4416 return mTransition; 4417 } 4418 4419 private void removeViewsInternal(int start, int count) { 4420 final View focused = mFocused; 4421 final boolean detach = mAttachInfo != null; 4422 boolean clearChildFocus = false; 4423 4424 final View[] children = mChildren; 4425 final int end = start + count; 4426 4427 for (int i = start; i < end; i++) { 4428 final View view = children[i]; 4429 4430 if (mTransition != null) { 4431 mTransition.removeChild(this, view); 4432 } 4433 4434 if (view == focused) { 4435 view.unFocus(null); 4436 clearChildFocus = true; 4437 } 4438 4439 view.clearAccessibilityFocus(); 4440 4441 cancelTouchTarget(view); 4442 cancelHoverTarget(view); 4443 4444 if (view.getAnimation() != null || 4445 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4446 addDisappearingView(view); 4447 } else if (detach) { 4448 view.dispatchDetachedFromWindow(); 4449 } 4450 4451 if (view.hasTransientState()) { 4452 childHasTransientStateChanged(view, false); 4453 } 4454 4455 needGlobalAttributesUpdate(false); 4456 4457 onViewRemoved(view); 4458 } 4459 4460 removeFromArray(start, count); 4461 4462 if (clearChildFocus) { 4463 clearChildFocus(focused); 4464 if (!rootViewRequestFocus()) { 4465 notifyGlobalFocusCleared(focused); 4466 } 4467 } 4468 } 4469 4470 /** 4471 * Call this method to remove all child views from the 4472 * ViewGroup. 4473 * 4474 * <p><strong>Note:</strong> do not invoke this method from 4475 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4476 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4477 */ 4478 public void removeAllViews() { 4479 removeAllViewsInLayout(); 4480 requestLayout(); 4481 invalidate(true); 4482 } 4483 4484 /** 4485 * Called by a ViewGroup subclass to remove child views from itself, 4486 * when it must first know its size on screen before it can calculate how many 4487 * child views it will render. An example is a Gallery or a ListView, which 4488 * may "have" 50 children, but actually only render the number of children 4489 * that can currently fit inside the object on screen. Do not call 4490 * this method unless you are extending ViewGroup and understand the 4491 * view measuring and layout pipeline. 4492 * 4493 * <p><strong>Note:</strong> do not invoke this method from 4494 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 4495 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 4496 */ 4497 public void removeAllViewsInLayout() { 4498 final int count = mChildrenCount; 4499 if (count <= 0) { 4500 return; 4501 } 4502 4503 final View[] children = mChildren; 4504 mChildrenCount = 0; 4505 4506 final View focused = mFocused; 4507 final boolean detach = mAttachInfo != null; 4508 boolean clearChildFocus = false; 4509 4510 needGlobalAttributesUpdate(false); 4511 4512 for (int i = count - 1; i >= 0; i--) { 4513 final View view = children[i]; 4514 4515 if (mTransition != null) { 4516 mTransition.removeChild(this, view); 4517 } 4518 4519 if (view == focused) { 4520 view.unFocus(null); 4521 clearChildFocus = true; 4522 } 4523 4524 view.clearAccessibilityFocus(); 4525 4526 cancelTouchTarget(view); 4527 cancelHoverTarget(view); 4528 4529 if (view.getAnimation() != null || 4530 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 4531 addDisappearingView(view); 4532 } else if (detach) { 4533 view.dispatchDetachedFromWindow(); 4534 } 4535 4536 if (view.hasTransientState()) { 4537 childHasTransientStateChanged(view, false); 4538 } 4539 4540 onViewRemoved(view); 4541 4542 view.mParent = null; 4543 children[i] = null; 4544 } 4545 4546 if (clearChildFocus) { 4547 clearChildFocus(focused); 4548 if (!rootViewRequestFocus()) { 4549 notifyGlobalFocusCleared(focused); 4550 } 4551 } 4552 } 4553 4554 /** 4555 * Finishes the removal of a detached view. This method will dispatch the detached from 4556 * window event and notify the hierarchy change listener. 4557 * <p> 4558 * This method is intended to be lightweight and makes no assumptions about whether the 4559 * parent or child should be redrawn. Proper use of this method will include also making 4560 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4561 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4562 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 4563 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4564 * 4565 * @param child the child to be definitely removed from the view hierarchy 4566 * @param animate if true and the view has an animation, the view is placed in the 4567 * disappearing views list, otherwise, it is detached from the window 4568 * 4569 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4570 * @see #detachAllViewsFromParent() 4571 * @see #detachViewFromParent(View) 4572 * @see #detachViewFromParent(int) 4573 */ 4574 protected void removeDetachedView(View child, boolean animate) { 4575 if (mTransition != null) { 4576 mTransition.removeChild(this, child); 4577 } 4578 4579 if (child == mFocused) { 4580 child.clearFocus(); 4581 } 4582 4583 child.clearAccessibilityFocus(); 4584 4585 cancelTouchTarget(child); 4586 cancelHoverTarget(child); 4587 4588 if ((animate && child.getAnimation() != null) || 4589 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 4590 addDisappearingView(child); 4591 } else if (child.mAttachInfo != null) { 4592 child.dispatchDetachedFromWindow(); 4593 } 4594 4595 if (child.hasTransientState()) { 4596 childHasTransientStateChanged(child, false); 4597 } 4598 4599 onViewRemoved(child); 4600 } 4601 4602 /** 4603 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 4604 * sets the layout parameters and puts the view in the list of children so that 4605 * it can be retrieved by calling {@link #getChildAt(int)}. 4606 * <p> 4607 * This method is intended to be lightweight and makes no assumptions about whether the 4608 * parent or child should be redrawn. Proper use of this method will include also making 4609 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 4610 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 4611 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 4612 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 4613 * <p> 4614 * This method should be called only for views which were detached from their parent. 4615 * 4616 * @param child the child to attach 4617 * @param index the index at which the child should be attached 4618 * @param params the layout parameters of the child 4619 * 4620 * @see #removeDetachedView(View, boolean) 4621 * @see #detachAllViewsFromParent() 4622 * @see #detachViewFromParent(View) 4623 * @see #detachViewFromParent(int) 4624 */ 4625 protected void attachViewToParent(View child, int index, LayoutParams params) { 4626 child.mLayoutParams = params; 4627 4628 if (index < 0) { 4629 index = mChildrenCount; 4630 } 4631 4632 addInArray(child, index); 4633 4634 child.mParent = this; 4635 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 4636 & ~PFLAG_DRAWING_CACHE_VALID) 4637 | PFLAG_DRAWN | PFLAG_INVALIDATED; 4638 this.mPrivateFlags |= PFLAG_INVALIDATED; 4639 4640 if (child.hasFocus()) { 4641 requestChildFocus(child, child.findFocus()); 4642 } 4643 } 4644 4645 /** 4646 * Detaches a view from its parent. Detaching a view should be followed 4647 * either by a call to 4648 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4649 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4650 * temporary; reattachment or removal should happen within the same drawing cycle as 4651 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4652 * call to {@link #getChildAt(int)}. 4653 * 4654 * @param child the child to detach 4655 * 4656 * @see #detachViewFromParent(int) 4657 * @see #detachViewsFromParent(int, int) 4658 * @see #detachAllViewsFromParent() 4659 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4660 * @see #removeDetachedView(View, boolean) 4661 */ 4662 protected void detachViewFromParent(View child) { 4663 removeFromArray(indexOfChild(child)); 4664 } 4665 4666 /** 4667 * Detaches a view from its parent. Detaching a view should be followed 4668 * either by a call to 4669 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4670 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4671 * temporary; reattachment or removal should happen within the same drawing cycle as 4672 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4673 * call to {@link #getChildAt(int)}. 4674 * 4675 * @param index the index of the child to detach 4676 * 4677 * @see #detachViewFromParent(View) 4678 * @see #detachAllViewsFromParent() 4679 * @see #detachViewsFromParent(int, int) 4680 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4681 * @see #removeDetachedView(View, boolean) 4682 */ 4683 protected void detachViewFromParent(int index) { 4684 removeFromArray(index); 4685 } 4686 4687 /** 4688 * Detaches a range of views from their parents. Detaching a view should be followed 4689 * either by a call to 4690 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4691 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4692 * temporary; reattachment or removal should happen within the same drawing cycle as 4693 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4694 * call to {@link #getChildAt(int)}. 4695 * 4696 * @param start the first index of the childrend range to detach 4697 * @param count the number of children to detach 4698 * 4699 * @see #detachViewFromParent(View) 4700 * @see #detachViewFromParent(int) 4701 * @see #detachAllViewsFromParent() 4702 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4703 * @see #removeDetachedView(View, boolean) 4704 */ 4705 protected void detachViewsFromParent(int start, int count) { 4706 removeFromArray(start, count); 4707 } 4708 4709 /** 4710 * Detaches all views from the parent. Detaching a view should be followed 4711 * either by a call to 4712 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4713 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4714 * temporary; reattachment or removal should happen within the same drawing cycle as 4715 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4716 * call to {@link #getChildAt(int)}. 4717 * 4718 * @see #detachViewFromParent(View) 4719 * @see #detachViewFromParent(int) 4720 * @see #detachViewsFromParent(int, int) 4721 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4722 * @see #removeDetachedView(View, boolean) 4723 */ 4724 protected void detachAllViewsFromParent() { 4725 final int count = mChildrenCount; 4726 if (count <= 0) { 4727 return; 4728 } 4729 4730 final View[] children = mChildren; 4731 mChildrenCount = 0; 4732 4733 for (int i = count - 1; i >= 0; i--) { 4734 children[i].mParent = null; 4735 children[i] = null; 4736 } 4737 } 4738 4739 /** 4740 * Don't call or override this method. It is used for the implementation of 4741 * the view hierarchy. 4742 */ 4743 public final void invalidateChild(View child, final Rect dirty) { 4744 ViewParent parent = this; 4745 4746 final AttachInfo attachInfo = mAttachInfo; 4747 if (attachInfo != null) { 4748 // If the child is drawing an animation, we want to copy this flag onto 4749 // ourselves and the parent to make sure the invalidate request goes 4750 // through 4751 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4752 == PFLAG_DRAW_ANIMATION; 4753 4754 // Check whether the child that requests the invalidate is fully opaque 4755 // Views being animated or transformed are not considered opaque because we may 4756 // be invalidating their old position and need the parent to paint behind them. 4757 Matrix childMatrix = child.getMatrix(); 4758 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4759 child.getAnimation() == null && childMatrix.isIdentity(); 4760 // Mark the child as dirty, using the appropriate flag 4761 // Make sure we do not set both flags at the same time 4762 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4763 4764 if (child.mLayerType != LAYER_TYPE_NONE) { 4765 mPrivateFlags |= PFLAG_INVALIDATED; 4766 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4767 } 4768 4769 final int[] location = attachInfo.mInvalidateChildLocation; 4770 location[CHILD_LEFT_INDEX] = child.mLeft; 4771 location[CHILD_TOP_INDEX] = child.mTop; 4772 if (!childMatrix.isIdentity() || 4773 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4774 RectF boundingRect = attachInfo.mTmpTransformRect; 4775 boundingRect.set(dirty); 4776 Matrix transformMatrix; 4777 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4778 Transformation t = attachInfo.mTmpTransformation; 4779 boolean transformed = getChildStaticTransformation(child, t); 4780 if (transformed) { 4781 transformMatrix = attachInfo.mTmpMatrix; 4782 transformMatrix.set(t.getMatrix()); 4783 if (!childMatrix.isIdentity()) { 4784 transformMatrix.preConcat(childMatrix); 4785 } 4786 } else { 4787 transformMatrix = childMatrix; 4788 } 4789 } else { 4790 transformMatrix = childMatrix; 4791 } 4792 transformMatrix.mapRect(boundingRect); 4793 dirty.set((int) (boundingRect.left - 0.5f), 4794 (int) (boundingRect.top - 0.5f), 4795 (int) (boundingRect.right + 0.5f), 4796 (int) (boundingRect.bottom + 0.5f)); 4797 } 4798 4799 do { 4800 View view = null; 4801 if (parent instanceof View) { 4802 view = (View) parent; 4803 } 4804 4805 if (drawAnimation) { 4806 if (view != null) { 4807 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4808 } else if (parent instanceof ViewRootImpl) { 4809 ((ViewRootImpl) parent).mIsAnimating = true; 4810 } 4811 } 4812 4813 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4814 // flag coming from the child that initiated the invalidate 4815 if (view != null) { 4816 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4817 view.getSolidColor() == 0) { 4818 opaqueFlag = PFLAG_DIRTY; 4819 } 4820 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4821 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4822 } 4823 } 4824 4825 parent = parent.invalidateChildInParent(location, dirty); 4826 if (view != null) { 4827 // Account for transform on current parent 4828 Matrix m = view.getMatrix(); 4829 if (!m.isIdentity()) { 4830 RectF boundingRect = attachInfo.mTmpTransformRect; 4831 boundingRect.set(dirty); 4832 m.mapRect(boundingRect); 4833 dirty.set((int) (boundingRect.left - 0.5f), 4834 (int) (boundingRect.top - 0.5f), 4835 (int) (boundingRect.right + 0.5f), 4836 (int) (boundingRect.bottom + 0.5f)); 4837 } 4838 } 4839 } while (parent != null); 4840 } 4841 } 4842 4843 /** 4844 * Don't call or override this method. It is used for the implementation of 4845 * the view hierarchy. 4846 * 4847 * This implementation returns null if this ViewGroup does not have a parent, 4848 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4849 * does not intersect with this ViewGroup's bounds. 4850 */ 4851 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4852 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4853 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4854 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4855 FLAG_OPTIMIZE_INVALIDATE) { 4856 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4857 location[CHILD_TOP_INDEX] - mScrollY); 4858 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4859 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4860 } 4861 4862 final int left = mLeft; 4863 final int top = mTop; 4864 4865 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4866 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4867 dirty.setEmpty(); 4868 } 4869 } 4870 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4871 4872 location[CHILD_LEFT_INDEX] = left; 4873 location[CHILD_TOP_INDEX] = top; 4874 4875 if (mLayerType != LAYER_TYPE_NONE) { 4876 mPrivateFlags |= PFLAG_INVALIDATED; 4877 } 4878 4879 return mParent; 4880 4881 } else { 4882 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 4883 4884 location[CHILD_LEFT_INDEX] = mLeft; 4885 location[CHILD_TOP_INDEX] = mTop; 4886 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4887 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4888 } else { 4889 // in case the dirty rect extends outside the bounds of this container 4890 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4891 } 4892 4893 if (mLayerType != LAYER_TYPE_NONE) { 4894 mPrivateFlags |= PFLAG_INVALIDATED; 4895 } 4896 4897 return mParent; 4898 } 4899 } 4900 4901 return null; 4902 } 4903 4904 /** 4905 * Native-calculated damage path 4906 * Returns false if this path was unable to complete successfully. This means 4907 * it hit a ViewParent it doesn't recognize and needs to fall back to calculating 4908 * damage area 4909 * @hide 4910 */ 4911 public boolean damageChildDeferred(View child) { 4912 ViewParent parent = getParent(); 4913 while (parent != null) { 4914 if (parent instanceof ViewGroup) { 4915 parent = parent.getParent(); 4916 } else if (parent instanceof ViewRootImpl) { 4917 ((ViewRootImpl) parent).invalidate(); 4918 return true; 4919 } else { 4920 parent = null; 4921 } 4922 } 4923 return false; 4924 } 4925 4926 /** 4927 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4928 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4929 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4930 * 4931 * @hide 4932 */ 4933 public void damageChild(View child, final Rect dirty) { 4934 if (damageChildDeferred(child)) { 4935 return; 4936 } 4937 4938 ViewParent parent = this; 4939 4940 final AttachInfo attachInfo = mAttachInfo; 4941 if (attachInfo != null) { 4942 int left = child.mLeft; 4943 int top = child.mTop; 4944 if (!child.getMatrix().isIdentity()) { 4945 child.transformRect(dirty); 4946 } 4947 4948 do { 4949 if (parent instanceof ViewGroup) { 4950 ViewGroup parentVG = (ViewGroup) parent; 4951 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4952 // Layered parents should be recreated, not just re-issued 4953 parentVG.invalidate(); 4954 parent = null; 4955 } else { 4956 parent = parentVG.damageChildInParent(left, top, dirty); 4957 left = parentVG.mLeft; 4958 top = parentVG.mTop; 4959 } 4960 } else { 4961 // Reached the top; this calls into the usual invalidate method in 4962 // ViewRootImpl, which schedules a traversal 4963 final int[] location = attachInfo.mInvalidateChildLocation; 4964 location[0] = left; 4965 location[1] = top; 4966 parent = parent.invalidateChildInParent(location, dirty); 4967 } 4968 } while (parent != null); 4969 } 4970 } 4971 4972 /** 4973 * Quick invalidation method that simply transforms the dirty rect into the parent's 4974 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4975 * 4976 * @hide 4977 */ 4978 protected ViewParent damageChildInParent(int left, int top, final Rect dirty) { 4979 if ((mPrivateFlags & PFLAG_DRAWN) != 0 4980 || (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) != 0) { 4981 dirty.offset(left - mScrollX, top - mScrollY); 4982 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) { 4983 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4984 } 4985 4986 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4987 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4988 4989 if (!getMatrix().isIdentity()) { 4990 transformRect(dirty); 4991 } 4992 4993 return mParent; 4994 } 4995 } 4996 4997 return null; 4998 } 4999 5000 /** 5001 * Offset a rectangle that is in a descendant's coordinate 5002 * space into our coordinate space. 5003 * @param descendant A descendant of this view 5004 * @param rect A rectangle defined in descendant's coordinate space. 5005 */ 5006 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 5007 offsetRectBetweenParentAndChild(descendant, rect, true, false); 5008 } 5009 5010 /** 5011 * Offset a rectangle that is in our coordinate space into an ancestor's 5012 * coordinate space. 5013 * @param descendant A descendant of this view 5014 * @param rect A rectangle defined in descendant's coordinate space. 5015 */ 5016 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 5017 offsetRectBetweenParentAndChild(descendant, rect, false, false); 5018 } 5019 5020 /** 5021 * Helper method that offsets a rect either from parent to descendant or 5022 * descendant to parent. 5023 */ 5024 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 5025 boolean offsetFromChildToParent, boolean clipToBounds) { 5026 5027 // already in the same coord system :) 5028 if (descendant == this) { 5029 return; 5030 } 5031 5032 ViewParent theParent = descendant.mParent; 5033 5034 // search and offset up to the parent 5035 while ((theParent != null) 5036 && (theParent instanceof View) 5037 && (theParent != this)) { 5038 5039 if (offsetFromChildToParent) { 5040 rect.offset(descendant.mLeft - descendant.mScrollX, 5041 descendant.mTop - descendant.mScrollY); 5042 if (clipToBounds) { 5043 View p = (View) theParent; 5044 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 5045 } 5046 } else { 5047 if (clipToBounds) { 5048 View p = (View) theParent; 5049 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 5050 } 5051 rect.offset(descendant.mScrollX - descendant.mLeft, 5052 descendant.mScrollY - descendant.mTop); 5053 } 5054 5055 descendant = (View) theParent; 5056 theParent = descendant.mParent; 5057 } 5058 5059 // now that we are up to this view, need to offset one more time 5060 // to get into our coordinate space 5061 if (theParent == this) { 5062 if (offsetFromChildToParent) { 5063 rect.offset(descendant.mLeft - descendant.mScrollX, 5064 descendant.mTop - descendant.mScrollY); 5065 } else { 5066 rect.offset(descendant.mScrollX - descendant.mLeft, 5067 descendant.mScrollY - descendant.mTop); 5068 } 5069 } else { 5070 throw new IllegalArgumentException("parameter must be a descendant of this view"); 5071 } 5072 } 5073 5074 /** 5075 * Offset the vertical location of all children of this view by the specified number of pixels. 5076 * 5077 * @param offset the number of pixels to offset 5078 * 5079 * @hide 5080 */ 5081 public void offsetChildrenTopAndBottom(int offset) { 5082 final int count = mChildrenCount; 5083 final View[] children = mChildren; 5084 boolean invalidate = false; 5085 5086 for (int i = 0; i < count; i++) { 5087 final View v = children[i]; 5088 v.mTop += offset; 5089 v.mBottom += offset; 5090 if (v.mRenderNode != null) { 5091 invalidate = true; 5092 v.mRenderNode.offsetTopAndBottom(offset); 5093 } 5094 } 5095 5096 if (invalidate) { 5097 invalidateViewProperty(false, false); 5098 } 5099 notifySubtreeAccessibilityStateChangedIfNeeded(); 5100 } 5101 5102 /** 5103 * {@inheritDoc} 5104 */ 5105 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 5106 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 5107 // but for some simple tests it can be useful. If we don't have attach info this 5108 // will allocate memory. 5109 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 5110 rect.set(r); 5111 5112 if (!child.hasIdentityMatrix()) { 5113 child.getMatrix().mapRect(rect); 5114 } 5115 5116 final int dx = child.mLeft - mScrollX; 5117 final int dy = child.mTop - mScrollY; 5118 5119 rect.offset(dx, dy); 5120 5121 if (offset != null) { 5122 if (!child.hasIdentityMatrix()) { 5123 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 5124 : new float[2]; 5125 position[0] = offset.x; 5126 position[1] = offset.y; 5127 child.getMatrix().mapPoints(position); 5128 offset.x = (int) (position[0] + 0.5f); 5129 offset.y = (int) (position[1] + 0.5f); 5130 } 5131 offset.x += dx; 5132 offset.y += dy; 5133 } 5134 5135 final int width = mRight - mLeft; 5136 final int height = mBottom - mTop; 5137 5138 boolean rectIsVisible = true; 5139 if (mParent == null || 5140 (mParent instanceof ViewGroup && ((ViewGroup) mParent).getClipChildren())) { 5141 // Clip to bounds. 5142 rectIsVisible = rect.intersect(0, 0, width, height); 5143 } 5144 5145 if (rectIsVisible && (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) { 5146 // Clip to padding. 5147 rectIsVisible = rect.intersect(mPaddingLeft, mPaddingTop, 5148 width - mPaddingRight, height - mPaddingBottom); 5149 } 5150 5151 if (rectIsVisible && mClipBounds != null) { 5152 // Clip to clipBounds. 5153 rectIsVisible = rect.intersect(mClipBounds.left, mClipBounds.top, mClipBounds.right, 5154 mClipBounds.bottom); 5155 } 5156 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), (int) (rect.right + 0.5f), 5157 (int) (rect.bottom + 0.5f)); 5158 if (rectIsVisible && mParent != null) { 5159 rectIsVisible = mParent.getChildVisibleRect(this, r, offset); 5160 } 5161 return rectIsVisible; 5162 } 5163 5164 /** 5165 * {@inheritDoc} 5166 */ 5167 @Override 5168 public final void layout(int l, int t, int r, int b) { 5169 if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) { 5170 if (mTransition != null) { 5171 mTransition.layoutChange(this); 5172 } 5173 super.layout(l, t, r, b); 5174 } else { 5175 // record the fact that we noop'd it; request layout when transition finishes 5176 mLayoutCalledWhileSuppressed = true; 5177 } 5178 } 5179 5180 /** 5181 * {@inheritDoc} 5182 */ 5183 @Override 5184 protected abstract void onLayout(boolean changed, 5185 int l, int t, int r, int b); 5186 5187 /** 5188 * Indicates whether the view group has the ability to animate its children 5189 * after the first layout. 5190 * 5191 * @return true if the children can be animated, false otherwise 5192 */ 5193 protected boolean canAnimate() { 5194 return mLayoutAnimationController != null; 5195 } 5196 5197 /** 5198 * Runs the layout animation. Calling this method triggers a relayout of 5199 * this view group. 5200 */ 5201 public void startLayoutAnimation() { 5202 if (mLayoutAnimationController != null) { 5203 mGroupFlags |= FLAG_RUN_ANIMATION; 5204 requestLayout(); 5205 } 5206 } 5207 5208 /** 5209 * Schedules the layout animation to be played after the next layout pass 5210 * of this view group. This can be used to restart the layout animation 5211 * when the content of the view group changes or when the activity is 5212 * paused and resumed. 5213 */ 5214 public void scheduleLayoutAnimation() { 5215 mGroupFlags |= FLAG_RUN_ANIMATION; 5216 } 5217 5218 /** 5219 * Sets the layout animation controller used to animate the group's 5220 * children after the first layout. 5221 * 5222 * @param controller the animation controller 5223 */ 5224 public void setLayoutAnimation(LayoutAnimationController controller) { 5225 mLayoutAnimationController = controller; 5226 if (mLayoutAnimationController != null) { 5227 mGroupFlags |= FLAG_RUN_ANIMATION; 5228 } 5229 } 5230 5231 /** 5232 * Returns the layout animation controller used to animate the group's 5233 * children. 5234 * 5235 * @return the current animation controller 5236 */ 5237 public LayoutAnimationController getLayoutAnimation() { 5238 return mLayoutAnimationController; 5239 } 5240 5241 /** 5242 * Indicates whether the children's drawing cache is used during a layout 5243 * animation. By default, the drawing cache is enabled but this will prevent 5244 * nested layout animations from working. To nest animations, you must disable 5245 * the cache. 5246 * 5247 * @return true if the animation cache is enabled, false otherwise 5248 * 5249 * @see #setAnimationCacheEnabled(boolean) 5250 * @see View#setDrawingCacheEnabled(boolean) 5251 */ 5252 @ViewDebug.ExportedProperty 5253 public boolean isAnimationCacheEnabled() { 5254 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 5255 } 5256 5257 /** 5258 * Enables or disables the children's drawing cache during a layout animation. 5259 * By default, the drawing cache is enabled but this will prevent nested 5260 * layout animations from working. To nest animations, you must disable the 5261 * cache. 5262 * 5263 * @param enabled true to enable the animation cache, false otherwise 5264 * 5265 * @see #isAnimationCacheEnabled() 5266 * @see View#setDrawingCacheEnabled(boolean) 5267 */ 5268 public void setAnimationCacheEnabled(boolean enabled) { 5269 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 5270 } 5271 5272 /** 5273 * Indicates whether this ViewGroup will always try to draw its children using their 5274 * drawing cache. By default this property is enabled. 5275 * 5276 * @return true if the animation cache is enabled, false otherwise 5277 * 5278 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5279 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5280 * @see View#setDrawingCacheEnabled(boolean) 5281 */ 5282 @ViewDebug.ExportedProperty(category = "drawing") 5283 public boolean isAlwaysDrawnWithCacheEnabled() { 5284 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 5285 } 5286 5287 /** 5288 * Indicates whether this ViewGroup will always try to draw its children using their 5289 * drawing cache. This property can be set to true when the cache rendering is 5290 * slightly different from the children's normal rendering. Renderings can be different, 5291 * for instance, when the cache's quality is set to low. 5292 * 5293 * When this property is disabled, the ViewGroup will use the drawing cache of its 5294 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 5295 * when to start using the drawing cache and when to stop using it. 5296 * 5297 * @param always true to always draw with the drawing cache, false otherwise 5298 * 5299 * @see #isAlwaysDrawnWithCacheEnabled() 5300 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5301 * @see View#setDrawingCacheEnabled(boolean) 5302 * @see View#setDrawingCacheQuality(int) 5303 */ 5304 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 5305 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 5306 } 5307 5308 /** 5309 * Indicates whether the ViewGroup is currently drawing its children using 5310 * their drawing cache. 5311 * 5312 * @return true if children should be drawn with their cache, false otherwise 5313 * 5314 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5315 * @see #setChildrenDrawnWithCacheEnabled(boolean) 5316 */ 5317 @ViewDebug.ExportedProperty(category = "drawing") 5318 protected boolean isChildrenDrawnWithCacheEnabled() { 5319 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 5320 } 5321 5322 /** 5323 * Tells the ViewGroup to draw its children using their drawing cache. This property 5324 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 5325 * will be used only if it has been enabled. 5326 * 5327 * Subclasses should call this method to start and stop using the drawing cache when 5328 * they perform performance sensitive operations, like scrolling or animating. 5329 * 5330 * @param enabled true if children should be drawn with their cache, false otherwise 5331 * 5332 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 5333 * @see #isChildrenDrawnWithCacheEnabled() 5334 */ 5335 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 5336 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 5337 } 5338 5339 /** 5340 * Indicates whether the ViewGroup is drawing its children in the order defined by 5341 * {@link #getChildDrawingOrder(int, int)}. 5342 * 5343 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 5344 * false otherwise 5345 * 5346 * @see #setChildrenDrawingOrderEnabled(boolean) 5347 * @see #getChildDrawingOrder(int, int) 5348 */ 5349 @ViewDebug.ExportedProperty(category = "drawing") 5350 protected boolean isChildrenDrawingOrderEnabled() { 5351 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 5352 } 5353 5354 /** 5355 * Tells the ViewGroup whether to draw its children in the order defined by the method 5356 * {@link #getChildDrawingOrder(int, int)}. 5357 * <p> 5358 * Note that {@link View#getZ() Z} reordering, done by {@link #dispatchDraw(Canvas)}, 5359 * will override custom child ordering done via this method. 5360 * 5361 * @param enabled true if the order of the children when drawing is determined by 5362 * {@link #getChildDrawingOrder(int, int)}, false otherwise 5363 * 5364 * @see #isChildrenDrawingOrderEnabled() 5365 * @see #getChildDrawingOrder(int, int) 5366 */ 5367 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 5368 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 5369 } 5370 5371 private boolean hasBooleanFlag(int flag) { 5372 return (mGroupFlags & flag) == flag; 5373 } 5374 5375 private void setBooleanFlag(int flag, boolean value) { 5376 if (value) { 5377 mGroupFlags |= flag; 5378 } else { 5379 mGroupFlags &= ~flag; 5380 } 5381 } 5382 5383 /** 5384 * Returns an integer indicating what types of drawing caches are kept in memory. 5385 * 5386 * @see #setPersistentDrawingCache(int) 5387 * @see #setAnimationCacheEnabled(boolean) 5388 * 5389 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 5390 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 5391 * and {@link #PERSISTENT_ALL_CACHES} 5392 */ 5393 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 5394 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 5395 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 5396 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 5397 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 5398 }) 5399 public int getPersistentDrawingCache() { 5400 return mPersistentDrawingCache; 5401 } 5402 5403 /** 5404 * Indicates what types of drawing caches should be kept in memory after 5405 * they have been created. 5406 * 5407 * @see #getPersistentDrawingCache() 5408 * @see #setAnimationCacheEnabled(boolean) 5409 * 5410 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 5411 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 5412 * and {@link #PERSISTENT_ALL_CACHES} 5413 */ 5414 public void setPersistentDrawingCache(int drawingCacheToKeep) { 5415 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 5416 } 5417 5418 private void setLayoutMode(int layoutMode, boolean explicitly) { 5419 mLayoutMode = layoutMode; 5420 setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); 5421 } 5422 5423 /** 5424 * Recursively traverse the view hierarchy, resetting the layoutMode of any 5425 * descendants that had inherited a different layoutMode from a previous parent. 5426 * Recursion terminates when a descendant's mode is: 5427 * <ul> 5428 * <li>Undefined</li> 5429 * <li>The same as the root node's</li> 5430 * <li>A mode that had been explicitly set</li> 5431 * <ul/> 5432 * The first two clauses are optimizations. 5433 * @param layoutModeOfRoot 5434 */ 5435 @Override 5436 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 5437 if (mLayoutMode == LAYOUT_MODE_UNDEFINED || 5438 mLayoutMode == layoutModeOfRoot || 5439 hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 5440 return; 5441 } 5442 setLayoutMode(LAYOUT_MODE_UNDEFINED, false); 5443 5444 // apply recursively 5445 for (int i = 0, N = getChildCount(); i < N; i++) { 5446 getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); 5447 } 5448 } 5449 5450 /** 5451 * Returns the basis of alignment during layout operations on this ViewGroup: 5452 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 5453 * <p> 5454 * If no layoutMode was explicitly set, either programmatically or in an XML resource, 5455 * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, 5456 * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. 5457 * 5458 * @return the layout mode to use during layout operations 5459 * 5460 * @see #setLayoutMode(int) 5461 */ 5462 public int getLayoutMode() { 5463 if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { 5464 int inheritedLayoutMode = (mParent instanceof ViewGroup) ? 5465 ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; 5466 setLayoutMode(inheritedLayoutMode, false); 5467 } 5468 return mLayoutMode; 5469 } 5470 5471 /** 5472 * Sets the basis of alignment during the layout of this ViewGroup. 5473 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 5474 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 5475 * 5476 * @param layoutMode the layout mode to use during layout operations 5477 * 5478 * @see #getLayoutMode() 5479 * @attr ref android.R.styleable#ViewGroup_layoutMode 5480 */ 5481 public void setLayoutMode(int layoutMode) { 5482 if (mLayoutMode != layoutMode) { 5483 invalidateInheritedLayoutMode(layoutMode); 5484 setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); 5485 requestLayout(); 5486 } 5487 } 5488 5489 /** 5490 * Returns a new set of layout parameters based on the supplied attributes set. 5491 * 5492 * @param attrs the attributes to build the layout parameters from 5493 * 5494 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 5495 * of its descendants 5496 */ 5497 public LayoutParams generateLayoutParams(AttributeSet attrs) { 5498 return new LayoutParams(getContext(), attrs); 5499 } 5500 5501 /** 5502 * Returns a safe set of layout parameters based on the supplied layout params. 5503 * When a ViewGroup is passed a View whose layout params do not pass the test of 5504 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 5505 * is invoked. This method should return a new set of layout params suitable for 5506 * this ViewGroup, possibly by copying the appropriate attributes from the 5507 * specified set of layout params. 5508 * 5509 * @param p The layout parameters to convert into a suitable set of layout parameters 5510 * for this ViewGroup. 5511 * 5512 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 5513 * of its descendants 5514 */ 5515 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 5516 return p; 5517 } 5518 5519 /** 5520 * Returns a set of default layout parameters. These parameters are requested 5521 * when the View passed to {@link #addView(View)} has no layout parameters 5522 * already set. If null is returned, an exception is thrown from addView. 5523 * 5524 * @return a set of default layout parameters or null 5525 */ 5526 protected LayoutParams generateDefaultLayoutParams() { 5527 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 5528 } 5529 5530 /** 5531 * {@inheritDoc} 5532 */ 5533 @Override 5534 protected void debug(int depth) { 5535 super.debug(depth); 5536 String output; 5537 5538 if (mFocused != null) { 5539 output = debugIndent(depth); 5540 output += "mFocused"; 5541 Log.d(VIEW_LOG_TAG, output); 5542 } 5543 if (mChildrenCount != 0) { 5544 output = debugIndent(depth); 5545 output += "{"; 5546 Log.d(VIEW_LOG_TAG, output); 5547 } 5548 int count = mChildrenCount; 5549 for (int i = 0; i < count; i++) { 5550 View child = mChildren[i]; 5551 child.debug(depth + 1); 5552 } 5553 5554 if (mChildrenCount != 0) { 5555 output = debugIndent(depth); 5556 output += "}"; 5557 Log.d(VIEW_LOG_TAG, output); 5558 } 5559 } 5560 5561 /** 5562 * Returns the position in the group of the specified child view. 5563 * 5564 * @param child the view for which to get the position 5565 * @return a positive integer representing the position of the view in the 5566 * group, or -1 if the view does not exist in the group 5567 */ 5568 public int indexOfChild(View child) { 5569 final int count = mChildrenCount; 5570 final View[] children = mChildren; 5571 for (int i = 0; i < count; i++) { 5572 if (children[i] == child) { 5573 return i; 5574 } 5575 } 5576 return -1; 5577 } 5578 5579 /** 5580 * Returns the number of children in the group. 5581 * 5582 * @return a positive integer representing the number of children in 5583 * the group 5584 */ 5585 public int getChildCount() { 5586 return mChildrenCount; 5587 } 5588 5589 /** 5590 * Returns the view at the specified position in the group. 5591 * 5592 * @param index the position at which to get the view from 5593 * @return the view at the specified position or null if the position 5594 * does not exist within the group 5595 */ 5596 public View getChildAt(int index) { 5597 if (index < 0 || index >= mChildrenCount) { 5598 return null; 5599 } 5600 return mChildren[index]; 5601 } 5602 5603 /** 5604 * Ask all of the children of this view to measure themselves, taking into 5605 * account both the MeasureSpec requirements for this view and its padding. 5606 * We skip children that are in the GONE state The heavy lifting is done in 5607 * getChildMeasureSpec. 5608 * 5609 * @param widthMeasureSpec The width requirements for this view 5610 * @param heightMeasureSpec The height requirements for this view 5611 */ 5612 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 5613 final int size = mChildrenCount; 5614 final View[] children = mChildren; 5615 for (int i = 0; i < size; ++i) { 5616 final View child = children[i]; 5617 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 5618 measureChild(child, widthMeasureSpec, heightMeasureSpec); 5619 } 5620 } 5621 } 5622 5623 /** 5624 * Ask one of the children of this view to measure itself, taking into 5625 * account both the MeasureSpec requirements for this view and its padding. 5626 * The heavy lifting is done in getChildMeasureSpec. 5627 * 5628 * @param child The child to measure 5629 * @param parentWidthMeasureSpec The width requirements for this view 5630 * @param parentHeightMeasureSpec The height requirements for this view 5631 */ 5632 protected void measureChild(View child, int parentWidthMeasureSpec, 5633 int parentHeightMeasureSpec) { 5634 final LayoutParams lp = child.getLayoutParams(); 5635 5636 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5637 mPaddingLeft + mPaddingRight, lp.width); 5638 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5639 mPaddingTop + mPaddingBottom, lp.height); 5640 5641 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5642 } 5643 5644 /** 5645 * Ask one of the children of this view to measure itself, taking into 5646 * account both the MeasureSpec requirements for this view and its padding 5647 * and margins. The child must have MarginLayoutParams The heavy lifting is 5648 * done in getChildMeasureSpec. 5649 * 5650 * @param child The child to measure 5651 * @param parentWidthMeasureSpec The width requirements for this view 5652 * @param widthUsed Extra space that has been used up by the parent 5653 * horizontally (possibly by other children of the parent) 5654 * @param parentHeightMeasureSpec The height requirements for this view 5655 * @param heightUsed Extra space that has been used up by the parent 5656 * vertically (possibly by other children of the parent) 5657 */ 5658 protected void measureChildWithMargins(View child, 5659 int parentWidthMeasureSpec, int widthUsed, 5660 int parentHeightMeasureSpec, int heightUsed) { 5661 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 5662 5663 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 5664 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 5665 + widthUsed, lp.width); 5666 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 5667 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 5668 + heightUsed, lp.height); 5669 5670 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 5671 } 5672 5673 /** 5674 * Does the hard part of measureChildren: figuring out the MeasureSpec to 5675 * pass to a particular child. This method figures out the right MeasureSpec 5676 * for one dimension (height or width) of one child view. 5677 * 5678 * The goal is to combine information from our MeasureSpec with the 5679 * LayoutParams of the child to get the best possible results. For example, 5680 * if the this view knows its size (because its MeasureSpec has a mode of 5681 * EXACTLY), and the child has indicated in its LayoutParams that it wants 5682 * to be the same size as the parent, the parent should ask the child to 5683 * layout given an exact size. 5684 * 5685 * @param spec The requirements for this view 5686 * @param padding The padding of this view for the current dimension and 5687 * margins, if applicable 5688 * @param childDimension How big the child wants to be in the current 5689 * dimension 5690 * @return a MeasureSpec integer for the child 5691 */ 5692 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 5693 int specMode = MeasureSpec.getMode(spec); 5694 int specSize = MeasureSpec.getSize(spec); 5695 5696 int size = Math.max(0, specSize - padding); 5697 5698 int resultSize = 0; 5699 int resultMode = 0; 5700 5701 switch (specMode) { 5702 // Parent has imposed an exact size on us 5703 case MeasureSpec.EXACTLY: 5704 if (childDimension >= 0) { 5705 resultSize = childDimension; 5706 resultMode = MeasureSpec.EXACTLY; 5707 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5708 // Child wants to be our size. So be it. 5709 resultSize = size; 5710 resultMode = MeasureSpec.EXACTLY; 5711 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5712 // Child wants to determine its own size. It can't be 5713 // bigger than us. 5714 resultSize = size; 5715 resultMode = MeasureSpec.AT_MOST; 5716 } 5717 break; 5718 5719 // Parent has imposed a maximum size on us 5720 case MeasureSpec.AT_MOST: 5721 if (childDimension >= 0) { 5722 // Child wants a specific size... so be it 5723 resultSize = childDimension; 5724 resultMode = MeasureSpec.EXACTLY; 5725 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5726 // Child wants to be our size, but our size is not fixed. 5727 // Constrain child to not be bigger than us. 5728 resultSize = size; 5729 resultMode = MeasureSpec.AT_MOST; 5730 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5731 // Child wants to determine its own size. It can't be 5732 // bigger than us. 5733 resultSize = size; 5734 resultMode = MeasureSpec.AT_MOST; 5735 } 5736 break; 5737 5738 // Parent asked to see how big we want to be 5739 case MeasureSpec.UNSPECIFIED: 5740 if (childDimension >= 0) { 5741 // Child wants a specific size... let him have it 5742 resultSize = childDimension; 5743 resultMode = MeasureSpec.EXACTLY; 5744 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5745 // Child wants to be our size... find out how big it should 5746 // be 5747 resultSize = 0; 5748 resultMode = MeasureSpec.UNSPECIFIED; 5749 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5750 // Child wants to determine its own size.... find out how 5751 // big it should be 5752 resultSize = 0; 5753 resultMode = MeasureSpec.UNSPECIFIED; 5754 } 5755 break; 5756 } 5757 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 5758 } 5759 5760 5761 /** 5762 * Removes any pending animations for views that have been removed. Call 5763 * this if you don't want animations for exiting views to stack up. 5764 */ 5765 public void clearDisappearingChildren() { 5766 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5767 if (disappearingChildren != null) { 5768 final int count = disappearingChildren.size(); 5769 for (int i = 0; i < count; i++) { 5770 final View view = disappearingChildren.get(i); 5771 if (view.mAttachInfo != null) { 5772 view.dispatchDetachedFromWindow(); 5773 } 5774 view.clearAnimation(); 5775 } 5776 disappearingChildren.clear(); 5777 invalidate(); 5778 } 5779 } 5780 5781 /** 5782 * Add a view which is removed from mChildren but still needs animation 5783 * 5784 * @param v View to add 5785 */ 5786 private void addDisappearingView(View v) { 5787 ArrayList<View> disappearingChildren = mDisappearingChildren; 5788 5789 if (disappearingChildren == null) { 5790 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 5791 } 5792 5793 disappearingChildren.add(v); 5794 } 5795 5796 /** 5797 * Cleanup a view when its animation is done. This may mean removing it from 5798 * the list of disappearing views. 5799 * 5800 * @param view The view whose animation has finished 5801 * @param animation The animation, cannot be null 5802 */ 5803 void finishAnimatingView(final View view, Animation animation) { 5804 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5805 if (disappearingChildren != null) { 5806 if (disappearingChildren.contains(view)) { 5807 disappearingChildren.remove(view); 5808 5809 if (view.mAttachInfo != null) { 5810 view.dispatchDetachedFromWindow(); 5811 } 5812 5813 view.clearAnimation(); 5814 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5815 } 5816 } 5817 5818 if (animation != null && !animation.getFillAfter()) { 5819 view.clearAnimation(); 5820 } 5821 5822 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 5823 view.onAnimationEnd(); 5824 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5825 // so we'd rather be safe than sorry 5826 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 5827 // Draw one more frame after the animation is done 5828 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5829 } 5830 } 5831 5832 /** 5833 * Utility function called by View during invalidation to determine whether a view that 5834 * is invisible or gone should still be invalidated because it is being transitioned (and 5835 * therefore still needs to be drawn). 5836 */ 5837 boolean isViewTransitioning(View view) { 5838 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5839 } 5840 5841 /** 5842 * This method tells the ViewGroup that the given View object, which should have this 5843 * ViewGroup as its parent, 5844 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5845 * is removed from its parent. This allows animations, such as those used by 5846 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5847 * the removal of views. A call to this method should always be accompanied by a later call 5848 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5849 * so that the View finally gets removed. 5850 * 5851 * @param view The View object to be kept visible even if it gets removed from its parent. 5852 */ 5853 public void startViewTransition(View view) { 5854 if (view.mParent == this) { 5855 if (mTransitioningViews == null) { 5856 mTransitioningViews = new ArrayList<View>(); 5857 } 5858 mTransitioningViews.add(view); 5859 } 5860 } 5861 5862 /** 5863 * This method should always be called following an earlier call to 5864 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5865 * and will no longer be displayed. Note that this method does not perform the functionality 5866 * of removing a view from its parent; it just discontinues the display of a View that 5867 * has previously been removed. 5868 * 5869 * @return view The View object that has been removed but is being kept around in the visible 5870 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5871 */ 5872 public void endViewTransition(View view) { 5873 if (mTransitioningViews != null) { 5874 mTransitioningViews.remove(view); 5875 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5876 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5877 disappearingChildren.remove(view); 5878 if (mVisibilityChangingChildren != null && 5879 mVisibilityChangingChildren.contains(view)) { 5880 mVisibilityChangingChildren.remove(view); 5881 } else { 5882 if (view.mAttachInfo != null) { 5883 view.dispatchDetachedFromWindow(); 5884 } 5885 if (view.mParent != null) { 5886 view.mParent = null; 5887 } 5888 } 5889 invalidate(); 5890 } 5891 } 5892 } 5893 5894 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5895 new LayoutTransition.TransitionListener() { 5896 @Override 5897 public void startTransition(LayoutTransition transition, ViewGroup container, 5898 View view, int transitionType) { 5899 // We only care about disappearing items, since we need special logic to keep 5900 // those items visible after they've been 'removed' 5901 if (transitionType == LayoutTransition.DISAPPEARING) { 5902 startViewTransition(view); 5903 } 5904 } 5905 5906 @Override 5907 public void endTransition(LayoutTransition transition, ViewGroup container, 5908 View view, int transitionType) { 5909 if (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) { 5910 requestLayout(); 5911 mLayoutCalledWhileSuppressed = false; 5912 } 5913 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5914 endViewTransition(view); 5915 } 5916 } 5917 }; 5918 5919 /** 5920 * Tells this ViewGroup to suppress all layout() calls until layout 5921 * suppression is disabled with a later call to suppressLayout(false). 5922 * When layout suppression is disabled, a requestLayout() call is sent 5923 * if layout() was attempted while layout was being suppressed. 5924 * 5925 * @hide 5926 */ 5927 public void suppressLayout(boolean suppress) { 5928 mSuppressLayout = suppress; 5929 if (!suppress) { 5930 if (mLayoutCalledWhileSuppressed) { 5931 requestLayout(); 5932 mLayoutCalledWhileSuppressed = false; 5933 } 5934 } 5935 } 5936 5937 /** 5938 * Returns whether layout calls on this container are currently being 5939 * suppressed, due to an earlier call to {@link #suppressLayout(boolean)}. 5940 * 5941 * @return true if layout calls are currently suppressed, false otherwise. 5942 * 5943 * @hide 5944 */ 5945 public boolean isLayoutSuppressed() { 5946 return mSuppressLayout; 5947 } 5948 5949 /** 5950 * {@inheritDoc} 5951 */ 5952 @Override 5953 public boolean gatherTransparentRegion(Region region) { 5954 // If no transparent regions requested, we are always opaque. 5955 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 5956 if (meOpaque && region == null) { 5957 // The caller doesn't care about the region, so stop now. 5958 return true; 5959 } 5960 super.gatherTransparentRegion(region); 5961 final View[] children = mChildren; 5962 final int count = mChildrenCount; 5963 boolean noneOfTheChildrenAreTransparent = true; 5964 for (int i = 0; i < count; i++) { 5965 final View child = children[i]; 5966 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5967 if (!child.gatherTransparentRegion(region)) { 5968 noneOfTheChildrenAreTransparent = false; 5969 } 5970 } 5971 } 5972 return meOpaque || noneOfTheChildrenAreTransparent; 5973 } 5974 5975 /** 5976 * {@inheritDoc} 5977 */ 5978 public void requestTransparentRegion(View child) { 5979 if (child != null) { 5980 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 5981 if (mParent != null) { 5982 mParent.requestTransparentRegion(this); 5983 } 5984 } 5985 } 5986 5987 @Override 5988 public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) { 5989 insets = super.dispatchApplyWindowInsets(insets); 5990 if (!insets.isConsumed()) { 5991 final int count = getChildCount(); 5992 for (int i = 0; i < count; i++) { 5993 insets = getChildAt(i).dispatchApplyWindowInsets(insets); 5994 if (insets.isConsumed()) { 5995 break; 5996 } 5997 } 5998 } 5999 return insets; 6000 } 6001 6002 /** 6003 * Returns the animation listener to which layout animation events are 6004 * sent. 6005 * 6006 * @return an {@link android.view.animation.Animation.AnimationListener} 6007 */ 6008 public Animation.AnimationListener getLayoutAnimationListener() { 6009 return mAnimationListener; 6010 } 6011 6012 @Override 6013 protected void drawableStateChanged() { 6014 super.drawableStateChanged(); 6015 6016 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 6017 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 6018 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 6019 + " child has duplicateParentState set to true"); 6020 } 6021 6022 final View[] children = mChildren; 6023 final int count = mChildrenCount; 6024 6025 for (int i = 0; i < count; i++) { 6026 final View child = children[i]; 6027 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 6028 child.refreshDrawableState(); 6029 } 6030 } 6031 } 6032 } 6033 6034 @Override 6035 public void jumpDrawablesToCurrentState() { 6036 super.jumpDrawablesToCurrentState(); 6037 final View[] children = mChildren; 6038 final int count = mChildrenCount; 6039 for (int i = 0; i < count; i++) { 6040 children[i].jumpDrawablesToCurrentState(); 6041 } 6042 } 6043 6044 @Override 6045 protected int[] onCreateDrawableState(int extraSpace) { 6046 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 6047 return super.onCreateDrawableState(extraSpace); 6048 } 6049 6050 int need = 0; 6051 int n = getChildCount(); 6052 for (int i = 0; i < n; i++) { 6053 int[] childState = getChildAt(i).getDrawableState(); 6054 6055 if (childState != null) { 6056 need += childState.length; 6057 } 6058 } 6059 6060 int[] state = super.onCreateDrawableState(extraSpace + need); 6061 6062 for (int i = 0; i < n; i++) { 6063 int[] childState = getChildAt(i).getDrawableState(); 6064 6065 if (childState != null) { 6066 state = mergeDrawableStates(state, childState); 6067 } 6068 } 6069 6070 return state; 6071 } 6072 6073 /** 6074 * Sets whether this ViewGroup's drawable states also include 6075 * its children's drawable states. This is used, for example, to 6076 * make a group appear to be focused when its child EditText or button 6077 * is focused. 6078 */ 6079 public void setAddStatesFromChildren(boolean addsStates) { 6080 if (addsStates) { 6081 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 6082 } else { 6083 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 6084 } 6085 6086 refreshDrawableState(); 6087 } 6088 6089 /** 6090 * Returns whether this ViewGroup's drawable states also include 6091 * its children's drawable states. This is used, for example, to 6092 * make a group appear to be focused when its child EditText or button 6093 * is focused. 6094 */ 6095 public boolean addStatesFromChildren() { 6096 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 6097 } 6098 6099 /** 6100 * If {@link #addStatesFromChildren} is true, refreshes this group's 6101 * drawable state (to include the states from its children). 6102 */ 6103 public void childDrawableStateChanged(View child) { 6104 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 6105 refreshDrawableState(); 6106 } 6107 } 6108 6109 /** 6110 * Specifies the animation listener to which layout animation events must 6111 * be sent. Only 6112 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 6113 * and 6114 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 6115 * are invoked. 6116 * 6117 * @param animationListener the layout animation listener 6118 */ 6119 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 6120 mAnimationListener = animationListener; 6121 } 6122 6123 /** 6124 * This method is called by LayoutTransition when there are 'changing' animations that need 6125 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 6126 * starts all pending transitions prior to the drawing phase in the current traversal. 6127 * 6128 * @param transition The LayoutTransition to be started on the next traversal. 6129 * 6130 * @hide 6131 */ 6132 public void requestTransitionStart(LayoutTransition transition) { 6133 ViewRootImpl viewAncestor = getViewRootImpl(); 6134 if (viewAncestor != null) { 6135 viewAncestor.requestTransitionStart(transition); 6136 } 6137 } 6138 6139 /** 6140 * @hide 6141 */ 6142 @Override 6143 public boolean resolveRtlPropertiesIfNeeded() { 6144 final boolean result = super.resolveRtlPropertiesIfNeeded(); 6145 // We dont need to resolve the children RTL properties if nothing has changed for the parent 6146 if (result) { 6147 int count = getChildCount(); 6148 for (int i = 0; i < count; i++) { 6149 final View child = getChildAt(i); 6150 if (child.isLayoutDirectionInherited()) { 6151 child.resolveRtlPropertiesIfNeeded(); 6152 } 6153 } 6154 } 6155 return result; 6156 } 6157 6158 /** 6159 * @hide 6160 */ 6161 @Override 6162 public boolean resolveLayoutDirection() { 6163 final boolean result = super.resolveLayoutDirection(); 6164 if (result) { 6165 int count = getChildCount(); 6166 for (int i = 0; i < count; i++) { 6167 final View child = getChildAt(i); 6168 if (child.isLayoutDirectionInherited()) { 6169 child.resolveLayoutDirection(); 6170 } 6171 } 6172 } 6173 return result; 6174 } 6175 6176 /** 6177 * @hide 6178 */ 6179 @Override 6180 public boolean resolveTextDirection() { 6181 final boolean result = super.resolveTextDirection(); 6182 if (result) { 6183 int count = getChildCount(); 6184 for (int i = 0; i < count; i++) { 6185 final View child = getChildAt(i); 6186 if (child.isTextDirectionInherited()) { 6187 child.resolveTextDirection(); 6188 } 6189 } 6190 } 6191 return result; 6192 } 6193 6194 /** 6195 * @hide 6196 */ 6197 @Override 6198 public boolean resolveTextAlignment() { 6199 final boolean result = super.resolveTextAlignment(); 6200 if (result) { 6201 int count = getChildCount(); 6202 for (int i = 0; i < count; i++) { 6203 final View child = getChildAt(i); 6204 if (child.isTextAlignmentInherited()) { 6205 child.resolveTextAlignment(); 6206 } 6207 } 6208 } 6209 return result; 6210 } 6211 6212 /** 6213 * @hide 6214 */ 6215 @Override 6216 public void resolvePadding() { 6217 super.resolvePadding(); 6218 int count = getChildCount(); 6219 for (int i = 0; i < count; i++) { 6220 final View child = getChildAt(i); 6221 if (child.isLayoutDirectionInherited() && !child.isPaddingResolved()) { 6222 child.resolvePadding(); 6223 } 6224 } 6225 } 6226 6227 /** 6228 * @hide 6229 */ 6230 @Override 6231 protected void resolveDrawables() { 6232 super.resolveDrawables(); 6233 int count = getChildCount(); 6234 for (int i = 0; i < count; i++) { 6235 final View child = getChildAt(i); 6236 if (child.isLayoutDirectionInherited() && !child.areDrawablesResolved()) { 6237 child.resolveDrawables(); 6238 } 6239 } 6240 } 6241 6242 /** 6243 * @hide 6244 */ 6245 @Override 6246 public void resolveLayoutParams() { 6247 super.resolveLayoutParams(); 6248 int count = getChildCount(); 6249 for (int i = 0; i < count; i++) { 6250 final View child = getChildAt(i); 6251 child.resolveLayoutParams(); 6252 } 6253 } 6254 6255 /** 6256 * @hide 6257 */ 6258 @Override 6259 public void resetResolvedLayoutDirection() { 6260 super.resetResolvedLayoutDirection(); 6261 6262 int count = getChildCount(); 6263 for (int i = 0; i < count; i++) { 6264 final View child = getChildAt(i); 6265 if (child.isLayoutDirectionInherited()) { 6266 child.resetResolvedLayoutDirection(); 6267 } 6268 } 6269 } 6270 6271 /** 6272 * @hide 6273 */ 6274 @Override 6275 public void resetResolvedTextDirection() { 6276 super.resetResolvedTextDirection(); 6277 6278 int count = getChildCount(); 6279 for (int i = 0; i < count; i++) { 6280 final View child = getChildAt(i); 6281 if (child.isTextDirectionInherited()) { 6282 child.resetResolvedTextDirection(); 6283 } 6284 } 6285 } 6286 6287 /** 6288 * @hide 6289 */ 6290 @Override 6291 public void resetResolvedTextAlignment() { 6292 super.resetResolvedTextAlignment(); 6293 6294 int count = getChildCount(); 6295 for (int i = 0; i < count; i++) { 6296 final View child = getChildAt(i); 6297 if (child.isTextAlignmentInherited()) { 6298 child.resetResolvedTextAlignment(); 6299 } 6300 } 6301 } 6302 6303 /** 6304 * @hide 6305 */ 6306 @Override 6307 public void resetResolvedPadding() { 6308 super.resetResolvedPadding(); 6309 6310 int count = getChildCount(); 6311 for (int i = 0; i < count; i++) { 6312 final View child = getChildAt(i); 6313 if (child.isLayoutDirectionInherited()) { 6314 child.resetResolvedPadding(); 6315 } 6316 } 6317 } 6318 6319 /** 6320 * @hide 6321 */ 6322 @Override 6323 protected void resetResolvedDrawables() { 6324 super.resetResolvedDrawables(); 6325 6326 int count = getChildCount(); 6327 for (int i = 0; i < count; i++) { 6328 final View child = getChildAt(i); 6329 if (child.isLayoutDirectionInherited()) { 6330 child.resetResolvedDrawables(); 6331 } 6332 } 6333 } 6334 6335 /** 6336 * Return true if the pressed state should be delayed for children or descendants of this 6337 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 6338 * This prevents the pressed state from appearing when the user is actually trying to scroll 6339 * the content. 6340 * 6341 * The default implementation returns true for compatibility reasons. Subclasses that do 6342 * not scroll should generally override this method and return false. 6343 */ 6344 public boolean shouldDelayChildPressedState() { 6345 return true; 6346 } 6347 6348 /** 6349 * @inheritDoc 6350 */ 6351 @Override 6352 public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) { 6353 return false; 6354 } 6355 6356 /** 6357 * @inheritDoc 6358 */ 6359 @Override 6360 public void onNestedScrollAccepted(View child, View target, int axes) { 6361 mNestedScrollAxes = axes; 6362 } 6363 6364 /** 6365 * @inheritDoc 6366 * 6367 * <p>The default implementation of onStopNestedScroll calls 6368 * {@link #stopNestedScroll()} to halt any recursive nested scrolling in progress.</p> 6369 */ 6370 @Override 6371 public void onStopNestedScroll(View child) { 6372 // Stop any recursive nested scrolling. 6373 stopNestedScroll(); 6374 } 6375 6376 /** 6377 * @inheritDoc 6378 */ 6379 @Override 6380 public void onNestedScroll(View target, int dxConsumed, int dyConsumed, 6381 int dxUnconsumed, int dyUnconsumed) { 6382 // Do nothing 6383 } 6384 6385 /** 6386 * @inheritDoc 6387 */ 6388 @Override 6389 public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) { 6390 // Do nothing 6391 } 6392 6393 /** 6394 * @inheritDoc 6395 */ 6396 @Override 6397 public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) { 6398 return false; 6399 } 6400 6401 /** 6402 * @inheritDoc 6403 */ 6404 @Override 6405 public boolean onNestedPreFling(View target, float velocityX, float velocityY) { 6406 return false; 6407 } 6408 6409 /** 6410 * Return the current axes of nested scrolling for this ViewGroup. 6411 * 6412 * <p>A ViewGroup returning something other than {@link #SCROLL_AXIS_NONE} is currently 6413 * acting as a nested scrolling parent for one or more descendant views in the hierarchy.</p> 6414 * 6415 * @return Flags indicating the current axes of nested scrolling 6416 * @see #SCROLL_AXIS_HORIZONTAL 6417 * @see #SCROLL_AXIS_VERTICAL 6418 * @see #SCROLL_AXIS_NONE 6419 */ 6420 public int getNestedScrollAxes() { 6421 return mNestedScrollAxes; 6422 } 6423 6424 /** @hide */ 6425 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 6426 } 6427 6428 /** @hide */ 6429 @Override 6430 public void captureTransitioningViews(List<View> transitioningViews) { 6431 if (getVisibility() != View.VISIBLE) { 6432 return; 6433 } 6434 if (isTransitionGroup()) { 6435 transitioningViews.add(this); 6436 } else { 6437 int count = getChildCount(); 6438 for (int i = 0; i < count; i++) { 6439 View child = getChildAt(i); 6440 child.captureTransitioningViews(transitioningViews); 6441 } 6442 } 6443 } 6444 6445 /** @hide */ 6446 @Override 6447 public void findNamedViews(Map<String, View> namedElements) { 6448 if (getVisibility() != VISIBLE && mGhostView == null) { 6449 return; 6450 } 6451 super.findNamedViews(namedElements); 6452 int count = getChildCount(); 6453 for (int i = 0; i < count; i++) { 6454 View child = getChildAt(i); 6455 child.findNamedViews(namedElements); 6456 } 6457 } 6458 6459 /** 6460 * LayoutParams are used by views to tell their parents how they want to be 6461 * laid out. See 6462 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 6463 * for a list of all child view attributes that this class supports. 6464 * 6465 * <p> 6466 * The base LayoutParams class just describes how big the view wants to be 6467 * for both width and height. For each dimension, it can specify one of: 6468 * <ul> 6469 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 6470 * means that the view wants to be as big as its parent (minus padding) 6471 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 6472 * to enclose its content (plus padding) 6473 * <li> an exact number 6474 * </ul> 6475 * There are subclasses of LayoutParams for different subclasses of 6476 * ViewGroup. For example, AbsoluteLayout has its own subclass of 6477 * LayoutParams which adds an X and Y value.</p> 6478 * 6479 * <div class="special reference"> 6480 * <h3>Developer Guides</h3> 6481 * <p>For more information about creating user interface layouts, read the 6482 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 6483 * guide.</p></div> 6484 * 6485 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 6486 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 6487 */ 6488 public static class LayoutParams { 6489 /** 6490 * Special value for the height or width requested by a View. 6491 * FILL_PARENT means that the view wants to be as big as its parent, 6492 * minus the parent's padding, if any. This value is deprecated 6493 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 6494 */ 6495 @SuppressWarnings({"UnusedDeclaration"}) 6496 @Deprecated 6497 public static final int FILL_PARENT = -1; 6498 6499 /** 6500 * Special value for the height or width requested by a View. 6501 * MATCH_PARENT means that the view wants to be as big as its parent, 6502 * minus the parent's padding, if any. Introduced in API Level 8. 6503 */ 6504 public static final int MATCH_PARENT = -1; 6505 6506 /** 6507 * Special value for the height or width requested by a View. 6508 * WRAP_CONTENT means that the view wants to be just large enough to fit 6509 * its own internal content, taking its own padding into account. 6510 */ 6511 public static final int WRAP_CONTENT = -2; 6512 6513 /** 6514 * Information about how wide the view wants to be. Can be one of the 6515 * constants FILL_PARENT (replaced by MATCH_PARENT , 6516 * in API Level 8) or WRAP_CONTENT. or an exact size. 6517 */ 6518 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6519 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 6520 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 6521 }) 6522 public int width; 6523 6524 /** 6525 * Information about how tall the view wants to be. Can be one of the 6526 * constants FILL_PARENT (replaced by MATCH_PARENT , 6527 * in API Level 8) or WRAP_CONTENT. or an exact size. 6528 */ 6529 @ViewDebug.ExportedProperty(category = "layout", mapping = { 6530 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 6531 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 6532 }) 6533 public int height; 6534 6535 /** 6536 * Used to animate layouts. 6537 */ 6538 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 6539 6540 /** 6541 * Creates a new set of layout parameters. The values are extracted from 6542 * the supplied attributes set and context. The XML attributes mapped 6543 * to this set of layout parameters are: 6544 * 6545 * <ul> 6546 * <li><code>layout_width</code>: the width, either an exact value, 6547 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 6548 * {@link #MATCH_PARENT} in API Level 8)</li> 6549 * <li><code>layout_height</code>: the height, either an exact value, 6550 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 6551 * {@link #MATCH_PARENT} in API Level 8)</li> 6552 * </ul> 6553 * 6554 * @param c the application environment 6555 * @param attrs the set of attributes from which to extract the layout 6556 * parameters' values 6557 */ 6558 public LayoutParams(Context c, AttributeSet attrs) { 6559 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 6560 setBaseAttributes(a, 6561 R.styleable.ViewGroup_Layout_layout_width, 6562 R.styleable.ViewGroup_Layout_layout_height); 6563 a.recycle(); 6564 } 6565 6566 /** 6567 * Creates a new set of layout parameters with the specified width 6568 * and height. 6569 * 6570 * @param width the width, either {@link #WRAP_CONTENT}, 6571 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 6572 * API Level 8), or a fixed size in pixels 6573 * @param height the height, either {@link #WRAP_CONTENT}, 6574 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 6575 * API Level 8), or a fixed size in pixels 6576 */ 6577 public LayoutParams(int width, int height) { 6578 this.width = width; 6579 this.height = height; 6580 } 6581 6582 /** 6583 * Copy constructor. Clones the width and height values of the source. 6584 * 6585 * @param source The layout params to copy from. 6586 */ 6587 public LayoutParams(LayoutParams source) { 6588 this.width = source.width; 6589 this.height = source.height; 6590 } 6591 6592 /** 6593 * Used internally by MarginLayoutParams. 6594 * @hide 6595 */ 6596 LayoutParams() { 6597 } 6598 6599 /** 6600 * Extracts the layout parameters from the supplied attributes. 6601 * 6602 * @param a the style attributes to extract the parameters from 6603 * @param widthAttr the identifier of the width attribute 6604 * @param heightAttr the identifier of the height attribute 6605 */ 6606 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 6607 width = a.getLayoutDimension(widthAttr, "layout_width"); 6608 height = a.getLayoutDimension(heightAttr, "layout_height"); 6609 } 6610 6611 /** 6612 * Resolve layout parameters depending on the layout direction. Subclasses that care about 6613 * layoutDirection changes should override this method. The default implementation does 6614 * nothing. 6615 * 6616 * @param layoutDirection the direction of the layout 6617 * 6618 * {@link View#LAYOUT_DIRECTION_LTR} 6619 * {@link View#LAYOUT_DIRECTION_RTL} 6620 */ 6621 public void resolveLayoutDirection(int layoutDirection) { 6622 } 6623 6624 /** 6625 * Returns a String representation of this set of layout parameters. 6626 * 6627 * @param output the String to prepend to the internal representation 6628 * @return a String with the following format: output + 6629 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 6630 * 6631 * @hide 6632 */ 6633 public String debug(String output) { 6634 return output + "ViewGroup.LayoutParams={ width=" 6635 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 6636 } 6637 6638 /** 6639 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 6640 * 6641 * @param view the view that contains these layout parameters 6642 * @param canvas the canvas on which to draw 6643 * 6644 * @hide 6645 */ 6646 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6647 } 6648 6649 /** 6650 * Converts the specified size to a readable String. 6651 * 6652 * @param size the size to convert 6653 * @return a String instance representing the supplied size 6654 * 6655 * @hide 6656 */ 6657 protected static String sizeToString(int size) { 6658 if (size == WRAP_CONTENT) { 6659 return "wrap-content"; 6660 } 6661 if (size == MATCH_PARENT) { 6662 return "match-parent"; 6663 } 6664 return String.valueOf(size); 6665 } 6666 } 6667 6668 /** 6669 * Per-child layout information for layouts that support margins. 6670 * See 6671 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 6672 * for a list of all child view attributes that this class supports. 6673 */ 6674 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 6675 /** 6676 * The left margin in pixels of the child. Margin values should be positive. 6677 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6678 * to this field. 6679 */ 6680 @ViewDebug.ExportedProperty(category = "layout") 6681 public int leftMargin; 6682 6683 /** 6684 * The top margin in pixels of the child. Margin values should be positive. 6685 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6686 * to this field. 6687 */ 6688 @ViewDebug.ExportedProperty(category = "layout") 6689 public int topMargin; 6690 6691 /** 6692 * The right margin in pixels of the child. Margin values should be positive. 6693 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6694 * to this field. 6695 */ 6696 @ViewDebug.ExportedProperty(category = "layout") 6697 public int rightMargin; 6698 6699 /** 6700 * The bottom margin in pixels of the child. Margin values should be positive. 6701 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6702 * to this field. 6703 */ 6704 @ViewDebug.ExportedProperty(category = "layout") 6705 public int bottomMargin; 6706 6707 /** 6708 * The start margin in pixels of the child. Margin values should be positive. 6709 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6710 * to this field. 6711 */ 6712 @ViewDebug.ExportedProperty(category = "layout") 6713 private int startMargin = DEFAULT_MARGIN_RELATIVE; 6714 6715 /** 6716 * The end margin in pixels of the child. Margin values should be positive. 6717 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 6718 * to this field. 6719 */ 6720 @ViewDebug.ExportedProperty(category = "layout") 6721 private int endMargin = DEFAULT_MARGIN_RELATIVE; 6722 6723 /** 6724 * The default start and end margin. 6725 * @hide 6726 */ 6727 public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE; 6728 6729 /** 6730 * Bit 0: layout direction 6731 * Bit 1: layout direction 6732 * Bit 2: left margin undefined 6733 * Bit 3: right margin undefined 6734 * Bit 4: is RTL compatibility mode 6735 * Bit 5: need resolution 6736 * 6737 * Bit 6 to 7 not used 6738 * 6739 * @hide 6740 */ 6741 @ViewDebug.ExportedProperty(category = "layout", flagMapping = { 6742 @ViewDebug.FlagToString(mask = LAYOUT_DIRECTION_MASK, 6743 equals = LAYOUT_DIRECTION_MASK, name = "LAYOUT_DIRECTION"), 6744 @ViewDebug.FlagToString(mask = LEFT_MARGIN_UNDEFINED_MASK, 6745 equals = LEFT_MARGIN_UNDEFINED_MASK, name = "LEFT_MARGIN_UNDEFINED_MASK"), 6746 @ViewDebug.FlagToString(mask = RIGHT_MARGIN_UNDEFINED_MASK, 6747 equals = RIGHT_MARGIN_UNDEFINED_MASK, name = "RIGHT_MARGIN_UNDEFINED_MASK"), 6748 @ViewDebug.FlagToString(mask = RTL_COMPATIBILITY_MODE_MASK, 6749 equals = RTL_COMPATIBILITY_MODE_MASK, name = "RTL_COMPATIBILITY_MODE_MASK"), 6750 @ViewDebug.FlagToString(mask = NEED_RESOLUTION_MASK, 6751 equals = NEED_RESOLUTION_MASK, name = "NEED_RESOLUTION_MASK") 6752 }, formatToHexString = true) 6753 byte mMarginFlags; 6754 6755 private static final int LAYOUT_DIRECTION_MASK = 0x00000003; 6756 private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004; 6757 private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008; 6758 private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010; 6759 private static final int NEED_RESOLUTION_MASK = 0x00000020; 6760 6761 private static final int DEFAULT_MARGIN_RESOLVED = 0; 6762 private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE; 6763 6764 /** 6765 * Creates a new set of layout parameters. The values are extracted from 6766 * the supplied attributes set and context. 6767 * 6768 * @param c the application environment 6769 * @param attrs the set of attributes from which to extract the layout 6770 * parameters' values 6771 */ 6772 public MarginLayoutParams(Context c, AttributeSet attrs) { 6773 super(); 6774 6775 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 6776 setBaseAttributes(a, 6777 R.styleable.ViewGroup_MarginLayout_layout_width, 6778 R.styleable.ViewGroup_MarginLayout_layout_height); 6779 6780 int margin = a.getDimensionPixelSize( 6781 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 6782 if (margin >= 0) { 6783 leftMargin = margin; 6784 topMargin = margin; 6785 rightMargin= margin; 6786 bottomMargin = margin; 6787 } else { 6788 leftMargin = a.getDimensionPixelSize( 6789 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 6790 UNDEFINED_MARGIN); 6791 if (leftMargin == UNDEFINED_MARGIN) { 6792 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6793 leftMargin = DEFAULT_MARGIN_RESOLVED; 6794 } 6795 rightMargin = a.getDimensionPixelSize( 6796 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 6797 UNDEFINED_MARGIN); 6798 if (rightMargin == UNDEFINED_MARGIN) { 6799 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6800 rightMargin = DEFAULT_MARGIN_RESOLVED; 6801 } 6802 6803 topMargin = a.getDimensionPixelSize( 6804 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 6805 DEFAULT_MARGIN_RESOLVED); 6806 bottomMargin = a.getDimensionPixelSize( 6807 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 6808 DEFAULT_MARGIN_RESOLVED); 6809 6810 startMargin = a.getDimensionPixelSize( 6811 R.styleable.ViewGroup_MarginLayout_layout_marginStart, 6812 DEFAULT_MARGIN_RELATIVE); 6813 endMargin = a.getDimensionPixelSize( 6814 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, 6815 DEFAULT_MARGIN_RELATIVE); 6816 6817 if (isMarginRelative()) { 6818 mMarginFlags |= NEED_RESOLUTION_MASK; 6819 } 6820 } 6821 6822 final boolean hasRtlSupport = c.getApplicationInfo().hasRtlSupport(); 6823 final int targetSdkVersion = c.getApplicationInfo().targetSdkVersion; 6824 if (targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport) { 6825 mMarginFlags |= RTL_COMPATIBILITY_MODE_MASK; 6826 } 6827 6828 // Layout direction is LTR by default 6829 mMarginFlags |= LAYOUT_DIRECTION_LTR; 6830 6831 a.recycle(); 6832 } 6833 6834 /** 6835 * {@inheritDoc} 6836 */ 6837 public MarginLayoutParams(int width, int height) { 6838 super(width, height); 6839 6840 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6841 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6842 6843 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6844 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6845 } 6846 6847 /** 6848 * Copy constructor. Clones the width, height and margin values of the source. 6849 * 6850 * @param source The layout params to copy from. 6851 */ 6852 public MarginLayoutParams(MarginLayoutParams source) { 6853 this.width = source.width; 6854 this.height = source.height; 6855 6856 this.leftMargin = source.leftMargin; 6857 this.topMargin = source.topMargin; 6858 this.rightMargin = source.rightMargin; 6859 this.bottomMargin = source.bottomMargin; 6860 this.startMargin = source.startMargin; 6861 this.endMargin = source.endMargin; 6862 6863 this.mMarginFlags = source.mMarginFlags; 6864 } 6865 6866 /** 6867 * {@inheritDoc} 6868 */ 6869 public MarginLayoutParams(LayoutParams source) { 6870 super(source); 6871 6872 mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK; 6873 mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK; 6874 6875 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6876 mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK; 6877 } 6878 6879 /** 6880 * @hide Used internally. 6881 */ 6882 public final void copyMarginsFrom(MarginLayoutParams source) { 6883 this.leftMargin = source.leftMargin; 6884 this.topMargin = source.topMargin; 6885 this.rightMargin = source.rightMargin; 6886 this.bottomMargin = source.bottomMargin; 6887 this.startMargin = source.startMargin; 6888 this.endMargin = source.endMargin; 6889 6890 this.mMarginFlags = source.mMarginFlags; 6891 } 6892 6893 /** 6894 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 6895 * to be done so that the new margins are taken into account. Left and right margins may be 6896 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 6897 * Margin values should be positive. 6898 * 6899 * @param left the left margin size 6900 * @param top the top margin size 6901 * @param right the right margin size 6902 * @param bottom the bottom margin size 6903 * 6904 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 6905 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6906 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 6907 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6908 */ 6909 public void setMargins(int left, int top, int right, int bottom) { 6910 leftMargin = left; 6911 topMargin = top; 6912 rightMargin = right; 6913 bottomMargin = bottom; 6914 mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK; 6915 mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK; 6916 if (isMarginRelative()) { 6917 mMarginFlags |= NEED_RESOLUTION_MASK; 6918 } else { 6919 mMarginFlags &= ~NEED_RESOLUTION_MASK; 6920 } 6921 } 6922 6923 /** 6924 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 6925 * needs to be done so that the new relative margins are taken into account. Left and right 6926 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 6927 * direction. Margin values should be positive. 6928 * 6929 * @param start the start margin size 6930 * @param top the top margin size 6931 * @param end the right margin size 6932 * @param bottom the bottom margin size 6933 * 6934 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6935 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6936 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6937 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6938 * 6939 * @hide 6940 */ 6941 public void setMarginsRelative(int start, int top, int end, int bottom) { 6942 startMargin = start; 6943 topMargin = top; 6944 endMargin = end; 6945 bottomMargin = bottom; 6946 mMarginFlags |= NEED_RESOLUTION_MASK; 6947 } 6948 6949 /** 6950 * Sets the relative start margin. Margin values should be positive. 6951 * 6952 * @param start the start margin size 6953 * 6954 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6955 */ 6956 public void setMarginStart(int start) { 6957 startMargin = start; 6958 mMarginFlags |= NEED_RESOLUTION_MASK; 6959 } 6960 6961 /** 6962 * Returns the start margin in pixels. 6963 * 6964 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6965 * 6966 * @return the start margin in pixels. 6967 */ 6968 public int getMarginStart() { 6969 if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin; 6970 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 6971 doResolveMargins(); 6972 } 6973 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 6974 case View.LAYOUT_DIRECTION_RTL: 6975 return rightMargin; 6976 case View.LAYOUT_DIRECTION_LTR: 6977 default: 6978 return leftMargin; 6979 } 6980 } 6981 6982 /** 6983 * Sets the relative end margin. Margin values should be positive. 6984 * 6985 * @param end the end margin size 6986 * 6987 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6988 */ 6989 public void setMarginEnd(int end) { 6990 endMargin = end; 6991 mMarginFlags |= NEED_RESOLUTION_MASK; 6992 } 6993 6994 /** 6995 * Returns the end margin in pixels. 6996 * 6997 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6998 * 6999 * @return the end margin in pixels. 7000 */ 7001 public int getMarginEnd() { 7002 if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin; 7003 if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) { 7004 doResolveMargins(); 7005 } 7006 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 7007 case View.LAYOUT_DIRECTION_RTL: 7008 return leftMargin; 7009 case View.LAYOUT_DIRECTION_LTR: 7010 default: 7011 return rightMargin; 7012 } 7013 } 7014 7015 /** 7016 * Check if margins are relative. 7017 * 7018 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 7019 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 7020 * 7021 * @return true if either marginStart or marginEnd has been set. 7022 */ 7023 public boolean isMarginRelative() { 7024 return (startMargin != DEFAULT_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE); 7025 } 7026 7027 /** 7028 * Set the layout direction 7029 * @param layoutDirection the layout direction. 7030 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 7031 * or {@link View#LAYOUT_DIRECTION_RTL}. 7032 */ 7033 public void setLayoutDirection(int layoutDirection) { 7034 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 7035 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 7036 if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) { 7037 mMarginFlags &= ~LAYOUT_DIRECTION_MASK; 7038 mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK); 7039 if (isMarginRelative()) { 7040 mMarginFlags |= NEED_RESOLUTION_MASK; 7041 } else { 7042 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7043 } 7044 } 7045 } 7046 7047 /** 7048 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 7049 * {@link View#LAYOUT_DIRECTION_RTL}. 7050 * 7051 * @return the layout direction. 7052 */ 7053 public int getLayoutDirection() { 7054 return (mMarginFlags & LAYOUT_DIRECTION_MASK); 7055 } 7056 7057 /** 7058 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 7059 * may be overridden depending on layout direction. 7060 */ 7061 @Override 7062 public void resolveLayoutDirection(int layoutDirection) { 7063 setLayoutDirection(layoutDirection); 7064 7065 // No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything 7066 // Will use the left and right margins if no relative margin is defined. 7067 if (!isMarginRelative() || 7068 (mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return; 7069 7070 // Proceed with resolution 7071 doResolveMargins(); 7072 } 7073 7074 private void doResolveMargins() { 7075 if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) { 7076 // if left or right margins are not defined and if we have some start or end margin 7077 // defined then use those start and end margins. 7078 if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK 7079 && startMargin > DEFAULT_MARGIN_RELATIVE) { 7080 leftMargin = startMargin; 7081 } 7082 if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK 7083 && endMargin > DEFAULT_MARGIN_RELATIVE) { 7084 rightMargin = endMargin; 7085 } 7086 } else { 7087 // We have some relative margins (either the start one or the end one or both). So use 7088 // them and override what has been defined for left and right margins. If either start 7089 // or end margin is not defined, just set it to default "0". 7090 switch(mMarginFlags & LAYOUT_DIRECTION_MASK) { 7091 case View.LAYOUT_DIRECTION_RTL: 7092 leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 7093 endMargin : DEFAULT_MARGIN_RESOLVED; 7094 rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 7095 startMargin : DEFAULT_MARGIN_RESOLVED; 7096 break; 7097 case View.LAYOUT_DIRECTION_LTR: 7098 default: 7099 leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ? 7100 startMargin : DEFAULT_MARGIN_RESOLVED; 7101 rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ? 7102 endMargin : DEFAULT_MARGIN_RESOLVED; 7103 break; 7104 } 7105 } 7106 mMarginFlags &= ~NEED_RESOLUTION_MASK; 7107 } 7108 7109 /** 7110 * @hide 7111 */ 7112 public boolean isLayoutRtl() { 7113 return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL); 7114 } 7115 7116 /** 7117 * @hide 7118 */ 7119 @Override 7120 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 7121 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 7122 7123 fillDifference(canvas, 7124 view.getLeft() + oi.left, 7125 view.getTop() + oi.top, 7126 view.getRight() - oi.right, 7127 view.getBottom() - oi.bottom, 7128 leftMargin, 7129 topMargin, 7130 rightMargin, 7131 bottomMargin, 7132 paint); 7133 } 7134 } 7135 7136 /* Describes a touched view and the ids of the pointers that it has captured. 7137 * 7138 * This code assumes that pointer ids are always in the range 0..31 such that 7139 * it can use a bitfield to track which pointer ids are present. 7140 * As it happens, the lower layers of the input dispatch pipeline also use the 7141 * same trick so the assumption should be safe here... 7142 */ 7143 private static final class TouchTarget { 7144 private static final int MAX_RECYCLED = 32; 7145 private static final Object sRecycleLock = new Object[0]; 7146 private static TouchTarget sRecycleBin; 7147 private static int sRecycledCount; 7148 7149 public static final int ALL_POINTER_IDS = -1; // all ones 7150 7151 // The touched child view. 7152 public View child; 7153 7154 // The combined bit mask of pointer ids for all pointers captured by the target. 7155 public int pointerIdBits; 7156 7157 // The next target in the target list. 7158 public TouchTarget next; 7159 7160 private TouchTarget() { 7161 } 7162 7163 public static TouchTarget obtain(View child, int pointerIdBits) { 7164 final TouchTarget target; 7165 synchronized (sRecycleLock) { 7166 if (sRecycleBin == null) { 7167 target = new TouchTarget(); 7168 } else { 7169 target = sRecycleBin; 7170 sRecycleBin = target.next; 7171 sRecycledCount--; 7172 target.next = null; 7173 } 7174 } 7175 target.child = child; 7176 target.pointerIdBits = pointerIdBits; 7177 return target; 7178 } 7179 7180 public void recycle() { 7181 synchronized (sRecycleLock) { 7182 if (sRecycledCount < MAX_RECYCLED) { 7183 next = sRecycleBin; 7184 sRecycleBin = this; 7185 sRecycledCount += 1; 7186 } else { 7187 next = null; 7188 } 7189 child = null; 7190 } 7191 } 7192 } 7193 7194 /* Describes a hovered view. */ 7195 private static final class HoverTarget { 7196 private static final int MAX_RECYCLED = 32; 7197 private static final Object sRecycleLock = new Object[0]; 7198 private static HoverTarget sRecycleBin; 7199 private static int sRecycledCount; 7200 7201 // The hovered child view. 7202 public View child; 7203 7204 // The next target in the target list. 7205 public HoverTarget next; 7206 7207 private HoverTarget() { 7208 } 7209 7210 public static HoverTarget obtain(View child) { 7211 final HoverTarget target; 7212 synchronized (sRecycleLock) { 7213 if (sRecycleBin == null) { 7214 target = new HoverTarget(); 7215 } else { 7216 target = sRecycleBin; 7217 sRecycleBin = target.next; 7218 sRecycledCount--; 7219 target.next = null; 7220 } 7221 } 7222 target.child = child; 7223 return target; 7224 } 7225 7226 public void recycle() { 7227 synchronized (sRecycleLock) { 7228 if (sRecycledCount < MAX_RECYCLED) { 7229 next = sRecycleBin; 7230 sRecycleBin = this; 7231 sRecycledCount += 1; 7232 } else { 7233 next = null; 7234 } 7235 child = null; 7236 } 7237 } 7238 } 7239 7240 /** 7241 * Pooled class that orderes the children of a ViewGroup from start 7242 * to end based on how they are laid out and the layout direction. 7243 */ 7244 static class ChildListForAccessibility { 7245 7246 private static final int MAX_POOL_SIZE = 32; 7247 7248 private static final SynchronizedPool<ChildListForAccessibility> sPool = 7249 new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE); 7250 7251 private final ArrayList<View> mChildren = new ArrayList<View>(); 7252 7253 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 7254 7255 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 7256 ChildListForAccessibility list = sPool.acquire(); 7257 if (list == null) { 7258 list = new ChildListForAccessibility(); 7259 } 7260 list.init(parent, sort); 7261 return list; 7262 } 7263 7264 public void recycle() { 7265 clear(); 7266 sPool.release(this); 7267 } 7268 7269 public int getChildCount() { 7270 return mChildren.size(); 7271 } 7272 7273 public View getChildAt(int index) { 7274 return mChildren.get(index); 7275 } 7276 7277 public int getChildIndex(View child) { 7278 return mChildren.indexOf(child); 7279 } 7280 7281 private void init(ViewGroup parent, boolean sort) { 7282 ArrayList<View> children = mChildren; 7283 final int childCount = parent.getChildCount(); 7284 for (int i = 0; i < childCount; i++) { 7285 View child = parent.getChildAt(i); 7286 children.add(child); 7287 } 7288 if (sort) { 7289 ArrayList<ViewLocationHolder> holders = mHolders; 7290 for (int i = 0; i < childCount; i++) { 7291 View child = children.get(i); 7292 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 7293 holders.add(holder); 7294 } 7295 sort(holders); 7296 for (int i = 0; i < childCount; i++) { 7297 ViewLocationHolder holder = holders.get(i); 7298 children.set(i, holder.mView); 7299 holder.recycle(); 7300 } 7301 holders.clear(); 7302 } 7303 } 7304 7305 private void sort(ArrayList<ViewLocationHolder> holders) { 7306 // This is gross but the least risky solution. The current comparison 7307 // strategy breaks transitivity but produces very good results. Coming 7308 // up with a new strategy requires time which we do not have, so ... 7309 try { 7310 ViewLocationHolder.setComparisonStrategy( 7311 ViewLocationHolder.COMPARISON_STRATEGY_STRIPE); 7312 Collections.sort(holders); 7313 } catch (IllegalArgumentException iae) { 7314 // Note that in practice this occurs extremely rarely in a couple 7315 // of pathological cases. 7316 ViewLocationHolder.setComparisonStrategy( 7317 ViewLocationHolder.COMPARISON_STRATEGY_LOCATION); 7318 Collections.sort(holders); 7319 } 7320 } 7321 7322 private void clear() { 7323 mChildren.clear(); 7324 } 7325 } 7326 7327 /** 7328 * Pooled class that holds a View and its location with respect to 7329 * a specified root. This enables sorting of views based on their 7330 * coordinates without recomputing the position relative to the root 7331 * on every comparison. 7332 */ 7333 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 7334 7335 private static final int MAX_POOL_SIZE = 32; 7336 7337 private static final SynchronizedPool<ViewLocationHolder> sPool = 7338 new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE); 7339 7340 public static final int COMPARISON_STRATEGY_STRIPE = 1; 7341 7342 public static final int COMPARISON_STRATEGY_LOCATION = 2; 7343 7344 private static int sComparisonStrategy = COMPARISON_STRATEGY_STRIPE; 7345 7346 private final Rect mLocation = new Rect(); 7347 7348 public View mView; 7349 7350 private int mLayoutDirection; 7351 7352 public static ViewLocationHolder obtain(ViewGroup root, View view) { 7353 ViewLocationHolder holder = sPool.acquire(); 7354 if (holder == null) { 7355 holder = new ViewLocationHolder(); 7356 } 7357 holder.init(root, view); 7358 return holder; 7359 } 7360 7361 public static void setComparisonStrategy(int strategy) { 7362 sComparisonStrategy = strategy; 7363 } 7364 7365 public void recycle() { 7366 clear(); 7367 sPool.release(this); 7368 } 7369 7370 @Override 7371 public int compareTo(ViewLocationHolder another) { 7372 // This instance is greater than an invalid argument. 7373 if (another == null) { 7374 return 1; 7375 } 7376 7377 if (sComparisonStrategy == COMPARISON_STRATEGY_STRIPE) { 7378 // First is above second. 7379 if (mLocation.bottom - another.mLocation.top <= 0) { 7380 return -1; 7381 } 7382 // First is below second. 7383 if (mLocation.top - another.mLocation.bottom >= 0) { 7384 return 1; 7385 } 7386 } 7387 7388 // We are ordering left-to-right, top-to-bottom. 7389 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 7390 final int leftDifference = mLocation.left - another.mLocation.left; 7391 if (leftDifference != 0) { 7392 return leftDifference; 7393 } 7394 } else { // RTL 7395 final int rightDifference = mLocation.right - another.mLocation.right; 7396 if (rightDifference != 0) { 7397 return -rightDifference; 7398 } 7399 } 7400 // We are ordering left-to-right, top-to-bottom. 7401 final int topDifference = mLocation.top - another.mLocation.top; 7402 if (topDifference != 0) { 7403 return topDifference; 7404 } 7405 // Break tie by height. 7406 final int heightDiference = mLocation.height() - another.mLocation.height(); 7407 if (heightDiference != 0) { 7408 return -heightDiference; 7409 } 7410 // Break tie by width. 7411 final int widthDiference = mLocation.width() - another.mLocation.width(); 7412 if (widthDiference != 0) { 7413 return -widthDiference; 7414 } 7415 // Just break the tie somehow. The accessibliity ids are unique 7416 // and stable, hence this is deterministic tie breaking. 7417 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 7418 } 7419 7420 private void init(ViewGroup root, View view) { 7421 Rect viewLocation = mLocation; 7422 view.getDrawingRect(viewLocation); 7423 root.offsetDescendantRectToMyCoords(view, viewLocation); 7424 mView = view; 7425 mLayoutDirection = root.getLayoutDirection(); 7426 } 7427 7428 private void clear() { 7429 mView = null; 7430 mLocation.set(0, 0, 0, 0); 7431 } 7432 } 7433 7434 private static Paint getDebugPaint() { 7435 if (sDebugPaint == null) { 7436 sDebugPaint = new Paint(); 7437 sDebugPaint.setAntiAlias(false); 7438 } 7439 return sDebugPaint; 7440 } 7441 7442 private static void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 7443 if (sDebugLines== null) { 7444 // TODO: This won't work with multiple UI threads in a single process 7445 sDebugLines = new float[16]; 7446 } 7447 7448 sDebugLines[0] = x1; 7449 sDebugLines[1] = y1; 7450 sDebugLines[2] = x2; 7451 sDebugLines[3] = y1; 7452 7453 sDebugLines[4] = x2; 7454 sDebugLines[5] = y1; 7455 sDebugLines[6] = x2; 7456 sDebugLines[7] = y2; 7457 7458 sDebugLines[8] = x2; 7459 sDebugLines[9] = y2; 7460 sDebugLines[10] = x1; 7461 sDebugLines[11] = y2; 7462 7463 sDebugLines[12] = x1; 7464 sDebugLines[13] = y2; 7465 sDebugLines[14] = x1; 7466 sDebugLines[15] = y1; 7467 7468 canvas.drawLines(sDebugLines, paint); 7469 } 7470 7471 private final class OrderedChildIterator implements Iterator<View> { 7472 private List<View> mOrderedChildList; 7473 private boolean mUseCustomOrder; 7474 private int mCurrentIndex; 7475 private boolean mInitialized; 7476 7477 public void initialize() { 7478 mOrderedChildList = buildOrderedChildList(); 7479 mUseCustomOrder = (mOrderedChildList == null) 7480 && isChildrenDrawingOrderEnabled(); 7481 mCurrentIndex = mChildrenCount - 1; 7482 mInitialized = true; 7483 } 7484 7485 public void release() { 7486 if (mOrderedChildList != null) { 7487 mOrderedChildList.clear(); 7488 } 7489 mUseCustomOrder = false; 7490 mCurrentIndex = 0; 7491 mInitialized = false; 7492 } 7493 7494 public boolean isInitialized() { 7495 return mInitialized; 7496 } 7497 7498 @Override 7499 public boolean hasNext() { 7500 return (mCurrentIndex >= 0); 7501 } 7502 7503 @Override 7504 public View next() { 7505 if (!hasNext()) { 7506 throw new NoSuchElementException("No such element"); 7507 } 7508 return getChild(mCurrentIndex--); 7509 } 7510 7511 private View getChild(int index) { 7512 final int childIndex = mUseCustomOrder 7513 ? getChildDrawingOrder(mChildrenCount, index) : index; 7514 return (mOrderedChildList == null) 7515 ? mChildren[childIndex] : mOrderedChildList.get(childIndex); 7516 } 7517 7518 @Override 7519 public void remove() { 7520 throw new UnsupportedOperationException(); 7521 } 7522 } 7523} 7524