ViewGroup.java revision c2a6e194a682d5b4c327c4c02289b4d96cf564e1
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.res.Configuration; 22import android.content.res.TypedArray; 23import android.graphics.Bitmap; 24import android.graphics.Canvas; 25import android.graphics.Color; 26import android.graphics.Insets; 27import android.graphics.Matrix; 28import android.graphics.Paint; 29import android.graphics.PointF; 30import android.graphics.Rect; 31import android.graphics.RectF; 32import android.graphics.Region; 33import android.os.Build; 34import android.os.Parcelable; 35import android.os.SystemClock; 36import android.util.AttributeSet; 37import android.util.Log; 38import android.util.Pools.SynchronizedPool; 39import android.util.SparseArray; 40import android.view.accessibility.AccessibilityEvent; 41import android.view.accessibility.AccessibilityNodeInfo; 42import android.view.animation.Animation; 43import android.view.animation.AnimationUtils; 44import android.view.animation.LayoutAnimationController; 45import android.view.animation.Transformation; 46 47import com.android.internal.R; 48import com.android.internal.util.Predicate; 49 50import java.util.ArrayList; 51import java.util.Collections; 52import java.util.HashSet; 53 54/** 55 * <p> 56 * A <code>ViewGroup</code> is a special view that can contain other views 57 * (called children.) The view group is the base class for layouts and views 58 * containers. This class also defines the 59 * {@link android.view.ViewGroup.LayoutParams} class which serves as the base 60 * class for layouts parameters. 61 * </p> 62 * 63 * <p> 64 * Also see {@link LayoutParams} for layout attributes. 65 * </p> 66 * 67 * <div class="special reference"> 68 * <h3>Developer Guides</h3> 69 * <p>For more information about creating user interface layouts, read the 70 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 71 * guide.</p></div> 72 * 73 * @attr ref android.R.styleable#ViewGroup_clipChildren 74 * @attr ref android.R.styleable#ViewGroup_clipToPadding 75 * @attr ref android.R.styleable#ViewGroup_layoutAnimation 76 * @attr ref android.R.styleable#ViewGroup_animationCache 77 * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache 78 * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache 79 * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren 80 * @attr ref android.R.styleable#ViewGroup_descendantFocusability 81 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 82 */ 83public abstract class ViewGroup extends View implements ViewParent, ViewManager { 84 private static final String TAG = "ViewGroup"; 85 86 private static final boolean DBG = false; 87 /** @hide */ 88 public static boolean DEBUG_DRAW = false; 89 90 /** 91 * Views which have been hidden or removed which need to be animated on 92 * their way out. 93 * This field should be made private, so it is hidden from the SDK. 94 * {@hide} 95 */ 96 protected ArrayList<View> mDisappearingChildren; 97 98 /** 99 * Listener used to propagate events indicating when children are added 100 * and/or removed from a view group. 101 * This field should be made private, so it is hidden from the SDK. 102 * {@hide} 103 */ 104 protected OnHierarchyChangeListener mOnHierarchyChangeListener; 105 106 // The view contained within this ViewGroup that has or contains focus. 107 private View mFocused; 108 109 /** 110 * A Transformation used when drawing children, to 111 * apply on the child being drawn. 112 */ 113 final Transformation mChildTransformation = new Transformation(); 114 115 /** 116 * Used to track the current invalidation region. 117 */ 118 RectF mInvalidateRegion; 119 120 /** 121 * A Transformation used to calculate a correct 122 * invalidation area when the application is autoscaled. 123 */ 124 Transformation mInvalidationTransformation; 125 126 // View currently under an ongoing drag 127 private View mCurrentDragView; 128 129 // Metadata about the ongoing drag 130 private DragEvent mCurrentDrag; 131 private HashSet<View> mDragNotifiedChildren; 132 133 // Does this group have a child that can accept the current drag payload? 134 private boolean mChildAcceptsDrag; 135 136 // Used during drag dispatch 137 private final PointF mLocalPoint = new PointF(); 138 139 // Layout animation 140 private LayoutAnimationController mLayoutAnimationController; 141 private Animation.AnimationListener mAnimationListener; 142 143 // First touch target in the linked list of touch targets. 144 private TouchTarget mFirstTouchTarget; 145 146 // For debugging only. You can see these in hierarchyviewer. 147 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 148 @ViewDebug.ExportedProperty(category = "events") 149 private long mLastTouchDownTime; 150 @ViewDebug.ExportedProperty(category = "events") 151 private int mLastTouchDownIndex = -1; 152 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 153 @ViewDebug.ExportedProperty(category = "events") 154 private float mLastTouchDownX; 155 @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) 156 @ViewDebug.ExportedProperty(category = "events") 157 private float mLastTouchDownY; 158 159 // First hover target in the linked list of hover targets. 160 // The hover targets are children which have received ACTION_HOVER_ENTER. 161 // They might not have actually handled the hover event, but we will 162 // continue sending hover events to them as long as the pointer remains over 163 // their bounds and the view group does not intercept hover. 164 private HoverTarget mFirstHoverTarget; 165 166 // True if the view group itself received a hover event. 167 // It might not have actually handled the hover event. 168 private boolean mHoveredSelf; 169 170 /** 171 * Internal flags. 172 * 173 * This field should be made private, so it is hidden from the SDK. 174 * {@hide} 175 */ 176 @ViewDebug.ExportedProperty(flagMapping = { 177 @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN, 178 name = "CLIP_CHILDREN"), 179 @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING, 180 name = "CLIP_TO_PADDING"), 181 @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL, 182 name = "PADDING_NOT_NULL") 183 }) 184 protected int mGroupFlags; 185 186 /** 187 * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 188 */ 189 private int mLayoutMode = LAYOUT_MODE_UNDEFINED; 190 191 /** 192 * NOTE: If you change the flags below make sure to reflect the changes 193 * the DisplayList class 194 */ 195 196 // When set, ViewGroup invalidates only the child's rectangle 197 // Set by default 198 static final int FLAG_CLIP_CHILDREN = 0x1; 199 200 // When set, ViewGroup excludes the padding area from the invalidate rectangle 201 // Set by default 202 private static final int FLAG_CLIP_TO_PADDING = 0x2; 203 204 // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when 205 // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set 206 static final int FLAG_INVALIDATE_REQUIRED = 0x4; 207 208 // When set, dispatchDraw() will run the layout animation and unset the flag 209 private static final int FLAG_RUN_ANIMATION = 0x8; 210 211 // When set, there is either no layout animation on the ViewGroup or the layout 212 // animation is over 213 // Set by default 214 static final int FLAG_ANIMATION_DONE = 0x10; 215 216 // If set, this ViewGroup has padding; if unset there is no padding and we don't need 217 // to clip it, even if FLAG_CLIP_TO_PADDING is set 218 private static final int FLAG_PADDING_NOT_NULL = 0x20; 219 220 // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation 221 // Set by default 222 private static final int FLAG_ANIMATION_CACHE = 0x40; 223 224 // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a 225 // layout animation; this avoid clobbering the hierarchy 226 // Automatically set when the layout animation starts, depending on the animation's 227 // characteristics 228 static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; 229 230 // When set, the next call to drawChild() will clear mChildTransformation's matrix 231 static final int FLAG_CLEAR_TRANSFORMATION = 0x100; 232 233 // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes 234 // the children's Bitmap caches if necessary 235 // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) 236 private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; 237 238 /** 239 * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} 240 * to get the index of the child to draw for that iteration. 241 * 242 * @hide 243 */ 244 protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; 245 246 /** 247 * When set, this ViewGroup supports static transformations on children; this causes 248 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 249 * invoked when a child is drawn. 250 * 251 * Any subclass overriding 252 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 253 * set this flags in {@link #mGroupFlags}. 254 * 255 * {@hide} 256 */ 257 protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; 258 259 // When the previous drawChild() invocation used an alpha value that was lower than 260 // 1.0 and set it in mCachePaint 261 static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; 262 263 /** 264 * When set, this ViewGroup's drawable states also include those 265 * of its children. 266 */ 267 private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; 268 269 /** 270 * When set, this ViewGroup tries to always draw its children using their drawing cache. 271 */ 272 static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; 273 274 /** 275 * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to 276 * draw its children with their drawing cache. 277 */ 278 static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; 279 280 /** 281 * When set, this group will go through its list of children to notify them of 282 * any drawable state change. 283 */ 284 private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; 285 286 private static final int FLAG_MASK_FOCUSABILITY = 0x60000; 287 288 /** 289 * This view will get focus before any of its descendants. 290 */ 291 public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; 292 293 /** 294 * This view will get focus only if none of its descendants want it. 295 */ 296 public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; 297 298 /** 299 * This view will block any of its descendants from getting focus, even 300 * if they are focusable. 301 */ 302 public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; 303 304 /** 305 * Used to map between enum in attrubutes and flag values. 306 */ 307 private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = 308 {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, 309 FOCUS_BLOCK_DESCENDANTS}; 310 311 /** 312 * When set, this ViewGroup should not intercept touch events. 313 * {@hide} 314 */ 315 protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; 316 317 /** 318 * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. 319 */ 320 private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; 321 322 /** 323 * When set, this ViewGroup will not dispatch onAttachedToWindow calls 324 * to children when adding new views. This is used to prevent multiple 325 * onAttached calls when a ViewGroup adds children in its own onAttached method. 326 */ 327 private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; 328 329 /** 330 * When true, indicates that a layoutMode has been explicitly set, either with 331 * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource. 332 * This distinguishes the situation in which a layout mode was inherited from 333 * one of the ViewGroup's ancestors and cached locally. 334 */ 335 private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000; 336 337 /** 338 * Indicates which types of drawing caches are to be kept in memory. 339 * This field should be made private, so it is hidden from the SDK. 340 * {@hide} 341 */ 342 protected int mPersistentDrawingCache; 343 344 /** 345 * Used to indicate that no drawing cache should be kept in memory. 346 */ 347 public static final int PERSISTENT_NO_CACHE = 0x0; 348 349 /** 350 * Used to indicate that the animation drawing cache should be kept in memory. 351 */ 352 public static final int PERSISTENT_ANIMATION_CACHE = 0x1; 353 354 /** 355 * Used to indicate that the scrolling drawing cache should be kept in memory. 356 */ 357 public static final int PERSISTENT_SCROLLING_CACHE = 0x2; 358 359 /** 360 * Used to indicate that all drawing caches should be kept in memory. 361 */ 362 public static final int PERSISTENT_ALL_CACHES = 0x3; 363 364 // Layout Modes 365 366 private static final int LAYOUT_MODE_UNDEFINED = -1; 367 368 /** 369 * This constant is a {@link #setLayoutMode(int) layoutMode}. 370 * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top}, 371 * {@link #getRight() right} and {@link #getBottom() bottom}. 372 */ 373 public static final int LAYOUT_MODE_CLIP_BOUNDS = 0; 374 375 /** 376 * This constant is a {@link #setLayoutMode(int) layoutMode}. 377 * Optical bounds describe where a widget appears to be. They sit inside the clip 378 * bounds which need to cover a larger area to allow other effects, 379 * such as shadows and glows, to be drawn. 380 */ 381 public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1; 382 383 /** @hide */ 384 public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS; 385 386 /** 387 * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL 388 * are set at the same time. 389 */ 390 protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; 391 392 // Index of the child's left position in the mLocation array 393 private static final int CHILD_LEFT_INDEX = 0; 394 // Index of the child's top position in the mLocation array 395 private static final int CHILD_TOP_INDEX = 1; 396 397 // Child views of this ViewGroup 398 private View[] mChildren; 399 // Number of valid children in the mChildren array, the rest should be null or not 400 // considered as children 401 402 private boolean mLayoutSuppressed = false; 403 404 private int mChildrenCount; 405 406 private static final int ARRAY_INITIAL_CAPACITY = 12; 407 private static final int ARRAY_CAPACITY_INCREMENT = 12; 408 409 private static Paint sDebugPaint; 410 private static float[] sDebugLines; 411 412 // Used to draw cached views 413 Paint mCachePaint; 414 415 // Used to animate add/remove changes in layout 416 private LayoutTransition mTransition; 417 418 // The set of views that are currently being transitioned. This list is used to track views 419 // being removed that should not actually be removed from the parent yet because they are 420 // being animated. 421 private ArrayList<View> mTransitioningViews; 422 423 // List of children changing visibility. This is used to potentially keep rendering 424 // views during a transition when they otherwise would have become gone/invisible 425 private ArrayList<View> mVisibilityChangingChildren; 426 427 // Indicates how many of this container's child subtrees contain transient state 428 @ViewDebug.ExportedProperty(category = "layout") 429 private int mChildCountWithTransientState = 0; 430 431 public ViewGroup(Context context) { 432 super(context); 433 initViewGroup(); 434 } 435 436 public ViewGroup(Context context, AttributeSet attrs) { 437 super(context, attrs); 438 initViewGroup(); 439 initFromAttributes(context, attrs); 440 } 441 442 public ViewGroup(Context context, AttributeSet attrs, int defStyle) { 443 super(context, attrs, defStyle); 444 initViewGroup(); 445 initFromAttributes(context, attrs); 446 } 447 448 private boolean debugDraw() { 449 return DEBUG_DRAW || mAttachInfo != null && mAttachInfo.mDebugLayout; 450 } 451 452 private void initViewGroup() { 453 // ViewGroup doesn't draw by default 454 if (!debugDraw()) { 455 setFlags(WILL_NOT_DRAW, DRAW_MASK); 456 } 457 mGroupFlags |= FLAG_CLIP_CHILDREN; 458 mGroupFlags |= FLAG_CLIP_TO_PADDING; 459 mGroupFlags |= FLAG_ANIMATION_DONE; 460 mGroupFlags |= FLAG_ANIMATION_CACHE; 461 mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; 462 463 if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { 464 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 465 } 466 467 setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); 468 469 mChildren = new View[ARRAY_INITIAL_CAPACITY]; 470 mChildrenCount = 0; 471 472 mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; 473 } 474 475 private void initFromAttributes(Context context, AttributeSet attrs) { 476 TypedArray a = context.obtainStyledAttributes(attrs, 477 R.styleable.ViewGroup); 478 479 final int N = a.getIndexCount(); 480 for (int i = 0; i < N; i++) { 481 int attr = a.getIndex(i); 482 switch (attr) { 483 case R.styleable.ViewGroup_clipChildren: 484 setClipChildren(a.getBoolean(attr, true)); 485 break; 486 case R.styleable.ViewGroup_clipToPadding: 487 setClipToPadding(a.getBoolean(attr, true)); 488 break; 489 case R.styleable.ViewGroup_animationCache: 490 setAnimationCacheEnabled(a.getBoolean(attr, true)); 491 break; 492 case R.styleable.ViewGroup_persistentDrawingCache: 493 setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); 494 break; 495 case R.styleable.ViewGroup_addStatesFromChildren: 496 setAddStatesFromChildren(a.getBoolean(attr, false)); 497 break; 498 case R.styleable.ViewGroup_alwaysDrawnWithCache: 499 setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); 500 break; 501 case R.styleable.ViewGroup_layoutAnimation: 502 int id = a.getResourceId(attr, -1); 503 if (id > 0) { 504 setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); 505 } 506 break; 507 case R.styleable.ViewGroup_descendantFocusability: 508 setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); 509 break; 510 case R.styleable.ViewGroup_splitMotionEvents: 511 setMotionEventSplittingEnabled(a.getBoolean(attr, false)); 512 break; 513 case R.styleable.ViewGroup_animateLayoutChanges: 514 boolean animateLayoutChanges = a.getBoolean(attr, false); 515 if (animateLayoutChanges) { 516 setLayoutTransition(new LayoutTransition()); 517 } 518 break; 519 case R.styleable.ViewGroup_layoutMode: 520 setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED)); 521 break; 522 } 523 } 524 525 a.recycle(); 526 } 527 528 /** 529 * Gets the descendant focusability of this view group. The descendant 530 * focusability defines the relationship between this view group and its 531 * descendants when looking for a view to take focus in 532 * {@link #requestFocus(int, android.graphics.Rect)}. 533 * 534 * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 535 * {@link #FOCUS_BLOCK_DESCENDANTS}. 536 */ 537 @ViewDebug.ExportedProperty(category = "focus", mapping = { 538 @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), 539 @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), 540 @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") 541 }) 542 public int getDescendantFocusability() { 543 return mGroupFlags & FLAG_MASK_FOCUSABILITY; 544 } 545 546 /** 547 * Set the descendant focusability of this view group. This defines the relationship 548 * between this view group and its descendants when looking for a view to 549 * take focus in {@link #requestFocus(int, android.graphics.Rect)}. 550 * 551 * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, 552 * {@link #FOCUS_BLOCK_DESCENDANTS}. 553 */ 554 public void setDescendantFocusability(int focusability) { 555 switch (focusability) { 556 case FOCUS_BEFORE_DESCENDANTS: 557 case FOCUS_AFTER_DESCENDANTS: 558 case FOCUS_BLOCK_DESCENDANTS: 559 break; 560 default: 561 throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " 562 + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); 563 } 564 mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; 565 mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); 566 } 567 568 /** 569 * {@inheritDoc} 570 */ 571 @Override 572 void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { 573 if (mFocused != null) { 574 mFocused.unFocus(); 575 mFocused = null; 576 } 577 super.handleFocusGainInternal(direction, previouslyFocusedRect); 578 } 579 580 /** 581 * {@inheritDoc} 582 */ 583 public void requestChildFocus(View child, View focused) { 584 if (DBG) { 585 System.out.println(this + " requestChildFocus()"); 586 } 587 if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { 588 return; 589 } 590 591 // Unfocus us, if necessary 592 super.unFocus(); 593 594 // We had a previous notion of who had focus. Clear it. 595 if (mFocused != child) { 596 if (mFocused != null) { 597 mFocused.unFocus(); 598 } 599 600 mFocused = child; 601 } 602 if (mParent != null) { 603 mParent.requestChildFocus(this, focused); 604 } 605 } 606 607 /** 608 * {@inheritDoc} 609 */ 610 public void focusableViewAvailable(View v) { 611 if (mParent != null 612 // shortcut: don't report a new focusable view if we block our descendants from 613 // getting focus 614 && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) 615 // shortcut: don't report a new focusable view if we already are focused 616 // (and we don't prefer our descendants) 617 // 618 // note: knowing that mFocused is non-null is not a good enough reason 619 // to break the traversal since in that case we'd actually have to find 620 // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and 621 // an ancestor of v; this will get checked for at ViewAncestor 622 && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { 623 mParent.focusableViewAvailable(v); 624 } 625 } 626 627 /** 628 * {@inheritDoc} 629 */ 630 public boolean showContextMenuForChild(View originalView) { 631 return mParent != null && mParent.showContextMenuForChild(originalView); 632 } 633 634 /** 635 * {@inheritDoc} 636 */ 637 public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { 638 return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; 639 } 640 641 /** 642 * Find the nearest view in the specified direction that wants to take 643 * focus. 644 * 645 * @param focused The view that currently has focus 646 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and 647 * FOCUS_RIGHT, or 0 for not applicable. 648 */ 649 public View focusSearch(View focused, int direction) { 650 if (isRootNamespace()) { 651 // root namespace means we should consider ourselves the top of the 652 // tree for focus searching; otherwise we could be focus searching 653 // into other tabs. see LocalActivityManager and TabHost for more info 654 return FocusFinder.getInstance().findNextFocus(this, focused, direction); 655 } else if (mParent != null) { 656 return mParent.focusSearch(focused, direction); 657 } 658 return null; 659 } 660 661 /** 662 * {@inheritDoc} 663 */ 664 public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { 665 return false; 666 } 667 668 /** 669 * {@inheritDoc} 670 */ 671 @Override 672 public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { 673 ViewParent parent = mParent; 674 if (parent == null) { 675 return false; 676 } 677 final boolean propagate = onRequestSendAccessibilityEvent(child, event); 678 if (!propagate) { 679 return false; 680 } 681 return parent.requestSendAccessibilityEvent(this, event); 682 } 683 684 /** 685 * Called when a child has requested sending an {@link AccessibilityEvent} and 686 * gives an opportunity to its parent to augment the event. 687 * <p> 688 * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling 689 * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its 690 * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} 691 * is responsible for handling this call. 692 * </p> 693 * 694 * @param child The child which requests sending the event. 695 * @param event The event to be sent. 696 * @return True if the event should be sent. 697 * 698 * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) 699 */ 700 public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { 701 if (mAccessibilityDelegate != null) { 702 return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); 703 } else { 704 return onRequestSendAccessibilityEventInternal(child, event); 705 } 706 } 707 708 /** 709 * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) 710 * 711 * Note: Called from the default {@link View.AccessibilityDelegate}. 712 */ 713 boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { 714 return true; 715 } 716 717 /** 718 * Called when a child view has changed whether or not it is tracking transient state. 719 * 720 * @hide 721 */ 722 public void childHasTransientStateChanged(View child, boolean childHasTransientState) { 723 final boolean oldHasTransientState = hasTransientState(); 724 if (childHasTransientState) { 725 mChildCountWithTransientState++; 726 } else { 727 mChildCountWithTransientState--; 728 } 729 730 final boolean newHasTransientState = hasTransientState(); 731 if (mParent != null && oldHasTransientState != newHasTransientState) { 732 try { 733 mParent.childHasTransientStateChanged(this, newHasTransientState); 734 } catch (AbstractMethodError e) { 735 Log.e(TAG, mParent.getClass().getSimpleName() + 736 " does not fully implement ViewParent", e); 737 } 738 } 739 } 740 741 /** 742 * @hide 743 */ 744 @Override 745 public boolean hasTransientState() { 746 return mChildCountWithTransientState > 0 || super.hasTransientState(); 747 } 748 749 /** 750 * {@inheritDoc} 751 */ 752 @Override 753 public boolean dispatchUnhandledMove(View focused, int direction) { 754 return mFocused != null && 755 mFocused.dispatchUnhandledMove(focused, direction); 756 } 757 758 /** 759 * {@inheritDoc} 760 */ 761 public void clearChildFocus(View child) { 762 if (DBG) { 763 System.out.println(this + " clearChildFocus()"); 764 } 765 766 mFocused = null; 767 if (mParent != null) { 768 mParent.clearChildFocus(this); 769 } 770 } 771 772 /** 773 * {@inheritDoc} 774 */ 775 @Override 776 public void clearFocus() { 777 if (DBG) { 778 System.out.println(this + " clearFocus()"); 779 } 780 if (mFocused == null) { 781 super.clearFocus(); 782 } else { 783 View focused = mFocused; 784 mFocused = null; 785 focused.clearFocus(); 786 } 787 } 788 789 /** 790 * {@inheritDoc} 791 */ 792 @Override 793 void unFocus() { 794 if (DBG) { 795 System.out.println(this + " unFocus()"); 796 } 797 if (mFocused == null) { 798 super.unFocus(); 799 } else { 800 mFocused.unFocus(); 801 mFocused = null; 802 } 803 } 804 805 /** 806 * Returns the focused child of this view, if any. The child may have focus 807 * or contain focus. 808 * 809 * @return the focused child or null. 810 */ 811 public View getFocusedChild() { 812 return mFocused; 813 } 814 815 /** 816 * Returns true if this view has or contains focus 817 * 818 * @return true if this view has or contains focus 819 */ 820 @Override 821 public boolean hasFocus() { 822 return (mPrivateFlags & PFLAG_FOCUSED) != 0 || mFocused != null; 823 } 824 825 /* 826 * (non-Javadoc) 827 * 828 * @see android.view.View#findFocus() 829 */ 830 @Override 831 public View findFocus() { 832 if (DBG) { 833 System.out.println("Find focus in " + this + ": flags=" 834 + isFocused() + ", child=" + mFocused); 835 } 836 837 if (isFocused()) { 838 return this; 839 } 840 841 if (mFocused != null) { 842 return mFocused.findFocus(); 843 } 844 return null; 845 } 846 847 /** 848 * {@inheritDoc} 849 */ 850 @Override 851 public boolean hasFocusable() { 852 if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { 853 return false; 854 } 855 856 if (isFocusable()) { 857 return true; 858 } 859 860 final int descendantFocusability = getDescendantFocusability(); 861 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 862 final int count = mChildrenCount; 863 final View[] children = mChildren; 864 865 for (int i = 0; i < count; i++) { 866 final View child = children[i]; 867 if (child.hasFocusable()) { 868 return true; 869 } 870 } 871 } 872 873 return false; 874 } 875 876 /** 877 * {@inheritDoc} 878 */ 879 @Override 880 public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { 881 final int focusableCount = views.size(); 882 883 final int descendantFocusability = getDescendantFocusability(); 884 885 if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { 886 final int count = mChildrenCount; 887 final View[] children = mChildren; 888 889 for (int i = 0; i < count; i++) { 890 final View child = children[i]; 891 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 892 child.addFocusables(views, direction, focusableMode); 893 } 894 } 895 } 896 897 // we add ourselves (if focusable) in all cases except for when we are 898 // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is 899 // to avoid the focus search finding layouts when a more precise search 900 // among the focusable children would be more interesting. 901 if (descendantFocusability != FOCUS_AFTER_DESCENDANTS 902 // No focusable descendants 903 || (focusableCount == views.size())) { 904 super.addFocusables(views, direction, focusableMode); 905 } 906 } 907 908 @Override 909 public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { 910 super.findViewsWithText(outViews, text, flags); 911 final int childrenCount = mChildrenCount; 912 final View[] children = mChildren; 913 for (int i = 0; i < childrenCount; i++) { 914 View child = children[i]; 915 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE 916 && (child.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 917 child.findViewsWithText(outViews, text, flags); 918 } 919 } 920 } 921 922 @Override 923 View findViewByAccessibilityIdTraversal(int accessibilityId) { 924 View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); 925 if (foundView != null) { 926 return foundView; 927 } 928 final int childrenCount = mChildrenCount; 929 final View[] children = mChildren; 930 for (int i = 0; i < childrenCount; i++) { 931 View child = children[i]; 932 foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); 933 if (foundView != null) { 934 return foundView; 935 } 936 } 937 return null; 938 } 939 940 /** 941 * {@inheritDoc} 942 */ 943 @Override 944 public void dispatchWindowFocusChanged(boolean hasFocus) { 945 super.dispatchWindowFocusChanged(hasFocus); 946 final int count = mChildrenCount; 947 final View[] children = mChildren; 948 for (int i = 0; i < count; i++) { 949 children[i].dispatchWindowFocusChanged(hasFocus); 950 } 951 } 952 953 /** 954 * {@inheritDoc} 955 */ 956 @Override 957 public void addTouchables(ArrayList<View> views) { 958 super.addTouchables(views); 959 960 final int count = mChildrenCount; 961 final View[] children = mChildren; 962 963 for (int i = 0; i < count; i++) { 964 final View child = children[i]; 965 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 966 child.addTouchables(views); 967 } 968 } 969 } 970 971 /** 972 * @hide 973 */ 974 @Override 975 public void makeOptionalFitsSystemWindows() { 976 super.makeOptionalFitsSystemWindows(); 977 final int count = mChildrenCount; 978 final View[] children = mChildren; 979 for (int i = 0; i < count; i++) { 980 children[i].makeOptionalFitsSystemWindows(); 981 } 982 } 983 984 /** 985 * {@inheritDoc} 986 */ 987 @Override 988 public void dispatchDisplayHint(int hint) { 989 super.dispatchDisplayHint(hint); 990 final int count = mChildrenCount; 991 final View[] children = mChildren; 992 for (int i = 0; i < count; i++) { 993 children[i].dispatchDisplayHint(hint); 994 } 995 } 996 997 /** 998 * Called when a view's visibility has changed. Notify the parent to take any appropriate 999 * action. 1000 * 1001 * @param child The view whose visibility has changed 1002 * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). 1003 * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). 1004 * @hide 1005 */ 1006 protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { 1007 if (mTransition != null) { 1008 if (newVisibility == VISIBLE) { 1009 mTransition.showChild(this, child, oldVisibility); 1010 } else { 1011 mTransition.hideChild(this, child, newVisibility); 1012 if (mTransitioningViews != null && mTransitioningViews.contains(child)) { 1013 // Only track this on disappearing views - appearing views are already visible 1014 // and don't need special handling during drawChild() 1015 if (mVisibilityChangingChildren == null) { 1016 mVisibilityChangingChildren = new ArrayList<View>(); 1017 } 1018 mVisibilityChangingChildren.add(child); 1019 addDisappearingView(child); 1020 } 1021 } 1022 } 1023 1024 // in all cases, for drags 1025 if (mCurrentDrag != null) { 1026 if (newVisibility == VISIBLE) { 1027 notifyChildOfDrag(child); 1028 } 1029 } 1030 } 1031 1032 /** 1033 * {@inheritDoc} 1034 */ 1035 @Override 1036 protected void dispatchVisibilityChanged(View changedView, int visibility) { 1037 super.dispatchVisibilityChanged(changedView, visibility); 1038 final int count = mChildrenCount; 1039 final View[] children = mChildren; 1040 for (int i = 0; i < count; i++) { 1041 children[i].dispatchVisibilityChanged(changedView, visibility); 1042 } 1043 } 1044 1045 /** 1046 * {@inheritDoc} 1047 */ 1048 @Override 1049 public void dispatchWindowVisibilityChanged(int visibility) { 1050 super.dispatchWindowVisibilityChanged(visibility); 1051 final int count = mChildrenCount; 1052 final View[] children = mChildren; 1053 for (int i = 0; i < count; i++) { 1054 children[i].dispatchWindowVisibilityChanged(visibility); 1055 } 1056 } 1057 1058 /** 1059 * {@inheritDoc} 1060 */ 1061 @Override 1062 public void dispatchConfigurationChanged(Configuration newConfig) { 1063 super.dispatchConfigurationChanged(newConfig); 1064 final int count = mChildrenCount; 1065 final View[] children = mChildren; 1066 for (int i = 0; i < count; i++) { 1067 children[i].dispatchConfigurationChanged(newConfig); 1068 } 1069 } 1070 1071 /** 1072 * {@inheritDoc} 1073 */ 1074 public void recomputeViewAttributes(View child) { 1075 if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { 1076 ViewParent parent = mParent; 1077 if (parent != null) parent.recomputeViewAttributes(this); 1078 } 1079 } 1080 1081 @Override 1082 void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) { 1083 if ((visibility & VISIBILITY_MASK) == VISIBLE) { 1084 super.dispatchCollectViewAttributes(attachInfo, visibility); 1085 final int count = mChildrenCount; 1086 final View[] children = mChildren; 1087 for (int i = 0; i < count; i++) { 1088 final View child = children[i]; 1089 child.dispatchCollectViewAttributes(attachInfo, 1090 visibility | (child.mViewFlags&VISIBILITY_MASK)); 1091 } 1092 } 1093 } 1094 1095 /** 1096 * {@inheritDoc} 1097 */ 1098 public void bringChildToFront(View child) { 1099 int index = indexOfChild(child); 1100 if (index >= 0) { 1101 removeFromArray(index); 1102 addInArray(child, mChildrenCount); 1103 child.mParent = this; 1104 } 1105 } 1106 1107 /** 1108 * {@inheritDoc} 1109 */ 1110 // TODO: Write real docs 1111 @Override 1112 public boolean dispatchDragEvent(DragEvent event) { 1113 boolean retval = false; 1114 final float tx = event.mX; 1115 final float ty = event.mY; 1116 1117 ViewRootImpl root = getViewRootImpl(); 1118 1119 // Dispatch down the view hierarchy 1120 switch (event.mAction) { 1121 case DragEvent.ACTION_DRAG_STARTED: { 1122 // clear state to recalculate which views we drag over 1123 mCurrentDragView = null; 1124 1125 // Set up our tracking of drag-started notifications 1126 mCurrentDrag = DragEvent.obtain(event); 1127 if (mDragNotifiedChildren == null) { 1128 mDragNotifiedChildren = new HashSet<View>(); 1129 } else { 1130 mDragNotifiedChildren.clear(); 1131 } 1132 1133 // Now dispatch down to our children, caching the responses 1134 mChildAcceptsDrag = false; 1135 final int count = mChildrenCount; 1136 final View[] children = mChildren; 1137 for (int i = 0; i < count; i++) { 1138 final View child = children[i]; 1139 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1140 if (child.getVisibility() == VISIBLE) { 1141 final boolean handled = notifyChildOfDrag(children[i]); 1142 if (handled) { 1143 mChildAcceptsDrag = true; 1144 } 1145 } 1146 } 1147 1148 // Return HANDLED if one of our children can accept the drag 1149 if (mChildAcceptsDrag) { 1150 retval = true; 1151 } 1152 } break; 1153 1154 case DragEvent.ACTION_DRAG_ENDED: { 1155 // Release the bookkeeping now that the drag lifecycle has ended 1156 if (mDragNotifiedChildren != null) { 1157 for (View child : mDragNotifiedChildren) { 1158 // If a child was notified about an ongoing drag, it's told that it's over 1159 child.dispatchDragEvent(event); 1160 child.mPrivateFlags2 &= ~View.DRAG_MASK; 1161 child.refreshDrawableState(); 1162 } 1163 1164 mDragNotifiedChildren.clear(); 1165 if (mCurrentDrag != null) { 1166 mCurrentDrag.recycle(); 1167 mCurrentDrag = null; 1168 } 1169 } 1170 1171 // We consider drag-ended to have been handled if one of our children 1172 // had offered to handle the drag. 1173 if (mChildAcceptsDrag) { 1174 retval = true; 1175 } 1176 } break; 1177 1178 case DragEvent.ACTION_DRAG_LOCATION: { 1179 // Find the [possibly new] drag target 1180 final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1181 1182 // If we've changed apparent drag target, tell the view root which view 1183 // we're over now [for purposes of the eventual drag-recipient-changed 1184 // notifications to the framework] and tell the new target that the drag 1185 // has entered its bounds. The root will see setDragFocus() calls all 1186 // the way down to the final leaf view that is handling the LOCATION event 1187 // before reporting the new potential recipient to the framework. 1188 if (mCurrentDragView != target) { 1189 root.setDragFocus(target); 1190 1191 final int action = event.mAction; 1192 // If we've dragged off of a child view, send it the EXITED message 1193 if (mCurrentDragView != null) { 1194 final View view = mCurrentDragView; 1195 event.mAction = DragEvent.ACTION_DRAG_EXITED; 1196 view.dispatchDragEvent(event); 1197 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1198 view.refreshDrawableState(); 1199 } 1200 mCurrentDragView = target; 1201 1202 // If we've dragged over a new child view, send it the ENTERED message 1203 if (target != null) { 1204 event.mAction = DragEvent.ACTION_DRAG_ENTERED; 1205 target.dispatchDragEvent(event); 1206 target.mPrivateFlags2 |= View.PFLAG2_DRAG_HOVERED; 1207 target.refreshDrawableState(); 1208 } 1209 event.mAction = action; // restore the event's original state 1210 } 1211 1212 // Dispatch the actual drag location notice, localized into its coordinates 1213 if (target != null) { 1214 event.mX = mLocalPoint.x; 1215 event.mY = mLocalPoint.y; 1216 1217 retval = target.dispatchDragEvent(event); 1218 1219 event.mX = tx; 1220 event.mY = ty; 1221 } 1222 } break; 1223 1224 /* Entered / exited dispatch 1225 * 1226 * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is 1227 * that we're about to get the corresponding LOCATION event, which we will use to 1228 * determine which of our children is the new target; at that point we will 1229 * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. 1230 * 1231 * DRAG_EXITED *is* dispatched all the way down immediately: once we know the 1232 * drag has left this ViewGroup, we know by definition that every contained subview 1233 * is also no longer under the drag point. 1234 */ 1235 1236 case DragEvent.ACTION_DRAG_EXITED: { 1237 if (mCurrentDragView != null) { 1238 final View view = mCurrentDragView; 1239 view.dispatchDragEvent(event); 1240 view.mPrivateFlags2 &= ~View.PFLAG2_DRAG_HOVERED; 1241 view.refreshDrawableState(); 1242 1243 mCurrentDragView = null; 1244 } 1245 } break; 1246 1247 case DragEvent.ACTION_DROP: { 1248 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); 1249 View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); 1250 if (target != null) { 1251 if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); 1252 event.mX = mLocalPoint.x; 1253 event.mY = mLocalPoint.y; 1254 retval = target.dispatchDragEvent(event); 1255 event.mX = tx; 1256 event.mY = ty; 1257 } else { 1258 if (ViewDebug.DEBUG_DRAG) { 1259 Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); 1260 } 1261 } 1262 } break; 1263 } 1264 1265 // If none of our children could handle the event, try here 1266 if (!retval) { 1267 // Call up to the View implementation that dispatches to installed listeners 1268 retval = super.dispatchDragEvent(event); 1269 } 1270 return retval; 1271 } 1272 1273 // Find the frontmost child view that lies under the given point, and calculate 1274 // the position within its own local coordinate system. 1275 View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { 1276 final int count = mChildrenCount; 1277 final View[] children = mChildren; 1278 for (int i = count - 1; i >= 0; i--) { 1279 final View child = children[i]; 1280 if (!child.canAcceptDrag()) { 1281 continue; 1282 } 1283 1284 if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { 1285 return child; 1286 } 1287 } 1288 return null; 1289 } 1290 1291 boolean notifyChildOfDrag(View child) { 1292 if (ViewDebug.DEBUG_DRAG) { 1293 Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); 1294 } 1295 1296 boolean canAccept = false; 1297 if (! mDragNotifiedChildren.contains(child)) { 1298 mDragNotifiedChildren.add(child); 1299 canAccept = child.dispatchDragEvent(mCurrentDrag); 1300 if (canAccept && !child.canAcceptDrag()) { 1301 child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT; 1302 child.refreshDrawableState(); 1303 } 1304 } 1305 return canAccept; 1306 } 1307 1308 @Override 1309 public void dispatchWindowSystemUiVisiblityChanged(int visible) { 1310 super.dispatchWindowSystemUiVisiblityChanged(visible); 1311 1312 final int count = mChildrenCount; 1313 final View[] children = mChildren; 1314 for (int i=0; i <count; i++) { 1315 final View child = children[i]; 1316 child.dispatchWindowSystemUiVisiblityChanged(visible); 1317 } 1318 } 1319 1320 @Override 1321 public void dispatchSystemUiVisibilityChanged(int visible) { 1322 super.dispatchSystemUiVisibilityChanged(visible); 1323 1324 final int count = mChildrenCount; 1325 final View[] children = mChildren; 1326 for (int i=0; i <count; i++) { 1327 final View child = children[i]; 1328 child.dispatchSystemUiVisibilityChanged(visible); 1329 } 1330 } 1331 1332 @Override 1333 boolean updateLocalSystemUiVisibility(int localValue, int localChanges) { 1334 boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges); 1335 1336 final int count = mChildrenCount; 1337 final View[] children = mChildren; 1338 for (int i=0; i <count; i++) { 1339 final View child = children[i]; 1340 changed |= child.updateLocalSystemUiVisibility(localValue, localChanges); 1341 } 1342 return changed; 1343 } 1344 1345 /** 1346 * {@inheritDoc} 1347 */ 1348 @Override 1349 public boolean dispatchKeyEventPreIme(KeyEvent event) { 1350 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1351 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1352 return super.dispatchKeyEventPreIme(event); 1353 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1354 == PFLAG_HAS_BOUNDS) { 1355 return mFocused.dispatchKeyEventPreIme(event); 1356 } 1357 return false; 1358 } 1359 1360 /** 1361 * {@inheritDoc} 1362 */ 1363 @Override 1364 public boolean dispatchKeyEvent(KeyEvent event) { 1365 if (mInputEventConsistencyVerifier != null) { 1366 mInputEventConsistencyVerifier.onKeyEvent(event, 1); 1367 } 1368 1369 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1370 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1371 if (super.dispatchKeyEvent(event)) { 1372 return true; 1373 } 1374 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1375 == PFLAG_HAS_BOUNDS) { 1376 if (mFocused.dispatchKeyEvent(event)) { 1377 return true; 1378 } 1379 } 1380 1381 if (mInputEventConsistencyVerifier != null) { 1382 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1383 } 1384 return false; 1385 } 1386 1387 /** 1388 * {@inheritDoc} 1389 */ 1390 @Override 1391 public boolean dispatchKeyShortcutEvent(KeyEvent event) { 1392 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1393 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1394 return super.dispatchKeyShortcutEvent(event); 1395 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1396 == PFLAG_HAS_BOUNDS) { 1397 return mFocused.dispatchKeyShortcutEvent(event); 1398 } 1399 return false; 1400 } 1401 1402 /** 1403 * {@inheritDoc} 1404 */ 1405 @Override 1406 public boolean dispatchTrackballEvent(MotionEvent event) { 1407 if (mInputEventConsistencyVerifier != null) { 1408 mInputEventConsistencyVerifier.onTrackballEvent(event, 1); 1409 } 1410 1411 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1412 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1413 if (super.dispatchTrackballEvent(event)) { 1414 return true; 1415 } 1416 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1417 == PFLAG_HAS_BOUNDS) { 1418 if (mFocused.dispatchTrackballEvent(event)) { 1419 return true; 1420 } 1421 } 1422 1423 if (mInputEventConsistencyVerifier != null) { 1424 mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); 1425 } 1426 return false; 1427 } 1428 1429 /** 1430 * {@inheritDoc} 1431 */ 1432 @SuppressWarnings({"ConstantConditions"}) 1433 @Override 1434 protected boolean dispatchHoverEvent(MotionEvent event) { 1435 final int action = event.getAction(); 1436 1437 // First check whether the view group wants to intercept the hover event. 1438 final boolean interceptHover = onInterceptHoverEvent(event); 1439 event.setAction(action); // restore action in case it was changed 1440 1441 MotionEvent eventNoHistory = event; 1442 boolean handled = false; 1443 1444 // Send events to the hovered children and build a new list of hover targets until 1445 // one is found that handles the event. 1446 HoverTarget firstOldHoverTarget = mFirstHoverTarget; 1447 mFirstHoverTarget = null; 1448 if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { 1449 final float x = event.getX(); 1450 final float y = event.getY(); 1451 final int childrenCount = mChildrenCount; 1452 if (childrenCount != 0) { 1453 final View[] children = mChildren; 1454 HoverTarget lastHoverTarget = null; 1455 for (int i = childrenCount - 1; i >= 0; i--) { 1456 final View child = children[i]; 1457 if (!canViewReceivePointerEvents(child) 1458 || !isTransformedTouchPointInView(x, y, child, null)) { 1459 continue; 1460 } 1461 1462 // Obtain a hover target for this child. Dequeue it from the 1463 // old hover target list if the child was previously hovered. 1464 HoverTarget hoverTarget = firstOldHoverTarget; 1465 final boolean wasHovered; 1466 for (HoverTarget predecessor = null; ;) { 1467 if (hoverTarget == null) { 1468 hoverTarget = HoverTarget.obtain(child); 1469 wasHovered = false; 1470 break; 1471 } 1472 1473 if (hoverTarget.child == child) { 1474 if (predecessor != null) { 1475 predecessor.next = hoverTarget.next; 1476 } else { 1477 firstOldHoverTarget = hoverTarget.next; 1478 } 1479 hoverTarget.next = null; 1480 wasHovered = true; 1481 break; 1482 } 1483 1484 predecessor = hoverTarget; 1485 hoverTarget = hoverTarget.next; 1486 } 1487 1488 // Enqueue the hover target onto the new hover target list. 1489 if (lastHoverTarget != null) { 1490 lastHoverTarget.next = hoverTarget; 1491 } else { 1492 lastHoverTarget = hoverTarget; 1493 mFirstHoverTarget = hoverTarget; 1494 } 1495 1496 // Dispatch the event to the child. 1497 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1498 if (!wasHovered) { 1499 // Send the enter as is. 1500 handled |= dispatchTransformedGenericPointerEvent( 1501 event, child); // enter 1502 } 1503 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1504 if (!wasHovered) { 1505 // Synthesize an enter from a move. 1506 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1507 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1508 handled |= dispatchTransformedGenericPointerEvent( 1509 eventNoHistory, child); // enter 1510 eventNoHistory.setAction(action); 1511 1512 handled |= dispatchTransformedGenericPointerEvent( 1513 eventNoHistory, child); // move 1514 } else { 1515 // Send the move as is. 1516 handled |= dispatchTransformedGenericPointerEvent(event, child); 1517 } 1518 } 1519 if (handled) { 1520 break; 1521 } 1522 } 1523 } 1524 } 1525 1526 // Send exit events to all previously hovered children that are no longer hovered. 1527 while (firstOldHoverTarget != null) { 1528 final View child = firstOldHoverTarget.child; 1529 1530 // Exit the old hovered child. 1531 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1532 // Send the exit as is. 1533 handled |= dispatchTransformedGenericPointerEvent( 1534 event, child); // exit 1535 } else { 1536 // Synthesize an exit from a move or enter. 1537 // Ignore the result because hover focus has moved to a different view. 1538 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1539 dispatchTransformedGenericPointerEvent( 1540 event, child); // move 1541 } 1542 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1543 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1544 dispatchTransformedGenericPointerEvent( 1545 eventNoHistory, child); // exit 1546 eventNoHistory.setAction(action); 1547 } 1548 1549 final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; 1550 firstOldHoverTarget.recycle(); 1551 firstOldHoverTarget = nextOldHoverTarget; 1552 } 1553 1554 // Send events to the view group itself if no children have handled it. 1555 boolean newHoveredSelf = !handled; 1556 if (newHoveredSelf == mHoveredSelf) { 1557 if (newHoveredSelf) { 1558 // Send event to the view group as before. 1559 handled |= super.dispatchHoverEvent(event); 1560 } 1561 } else { 1562 if (mHoveredSelf) { 1563 // Exit the view group. 1564 if (action == MotionEvent.ACTION_HOVER_EXIT) { 1565 // Send the exit as is. 1566 handled |= super.dispatchHoverEvent(event); // exit 1567 } else { 1568 // Synthesize an exit from a move or enter. 1569 // Ignore the result because hover focus is moving to a different view. 1570 if (action == MotionEvent.ACTION_HOVER_MOVE) { 1571 super.dispatchHoverEvent(event); // move 1572 } 1573 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1574 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); 1575 super.dispatchHoverEvent(eventNoHistory); // exit 1576 eventNoHistory.setAction(action); 1577 } 1578 mHoveredSelf = false; 1579 } 1580 1581 if (newHoveredSelf) { 1582 // Enter the view group. 1583 if (action == MotionEvent.ACTION_HOVER_ENTER) { 1584 // Send the enter as is. 1585 handled |= super.dispatchHoverEvent(event); // enter 1586 mHoveredSelf = true; 1587 } else if (action == MotionEvent.ACTION_HOVER_MOVE) { 1588 // Synthesize an enter from a move. 1589 eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); 1590 eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); 1591 handled |= super.dispatchHoverEvent(eventNoHistory); // enter 1592 eventNoHistory.setAction(action); 1593 1594 handled |= super.dispatchHoverEvent(eventNoHistory); // move 1595 mHoveredSelf = true; 1596 } 1597 } 1598 } 1599 1600 // Recycle the copy of the event that we made. 1601 if (eventNoHistory != event) { 1602 eventNoHistory.recycle(); 1603 } 1604 1605 // Done. 1606 return handled; 1607 } 1608 1609 private void exitHoverTargets() { 1610 if (mHoveredSelf || mFirstHoverTarget != null) { 1611 final long now = SystemClock.uptimeMillis(); 1612 MotionEvent event = MotionEvent.obtain(now, now, 1613 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1614 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1615 dispatchHoverEvent(event); 1616 event.recycle(); 1617 } 1618 } 1619 1620 private void cancelHoverTarget(View view) { 1621 HoverTarget predecessor = null; 1622 HoverTarget target = mFirstHoverTarget; 1623 while (target != null) { 1624 final HoverTarget next = target.next; 1625 if (target.child == view) { 1626 if (predecessor == null) { 1627 mFirstHoverTarget = next; 1628 } else { 1629 predecessor.next = next; 1630 } 1631 target.recycle(); 1632 1633 final long now = SystemClock.uptimeMillis(); 1634 MotionEvent event = MotionEvent.obtain(now, now, 1635 MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0); 1636 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 1637 view.dispatchHoverEvent(event); 1638 event.recycle(); 1639 return; 1640 } 1641 predecessor = target; 1642 target = next; 1643 } 1644 } 1645 1646 /** @hide */ 1647 @Override 1648 protected boolean hasHoveredChild() { 1649 return mFirstHoverTarget != null; 1650 } 1651 1652 @Override 1653 public void addChildrenForAccessibility(ArrayList<View> childrenForAccessibility) { 1654 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 1655 try { 1656 final int childrenCount = children.getChildCount(); 1657 for (int i = 0; i < childrenCount; i++) { 1658 View child = children.getChildAt(i); 1659 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 1660 if (child.includeForAccessibility()) { 1661 childrenForAccessibility.add(child); 1662 } else { 1663 child.addChildrenForAccessibility(childrenForAccessibility); 1664 } 1665 } 1666 } 1667 } finally { 1668 children.recycle(); 1669 } 1670 } 1671 1672 /** 1673 * @hide 1674 */ 1675 @Override 1676 public void childAccessibilityStateChanged(View child) { 1677 if (mParent != null) { 1678 mParent.childAccessibilityStateChanged(child); 1679 } 1680 } 1681 1682 /** 1683 * Implement this method to intercept hover events before they are handled 1684 * by child views. 1685 * <p> 1686 * This method is called before dispatching a hover event to a child of 1687 * the view group or to the view group's own {@link #onHoverEvent} to allow 1688 * the view group a chance to intercept the hover event. 1689 * This method can also be used to watch all pointer motions that occur within 1690 * the bounds of the view group even when the pointer is hovering over 1691 * a child of the view group rather than over the view group itself. 1692 * </p><p> 1693 * The view group can prevent its children from receiving hover events by 1694 * implementing this method and returning <code>true</code> to indicate 1695 * that it would like to intercept hover events. The view group must 1696 * continuously return <code>true</code> from {@link #onInterceptHoverEvent} 1697 * for as long as it wishes to continue intercepting hover events from 1698 * its children. 1699 * </p><p> 1700 * Interception preserves the invariant that at most one view can be 1701 * hovered at a time by transferring hover focus from the currently hovered 1702 * child to the view group or vice-versa as needed. 1703 * </p><p> 1704 * If this method returns <code>true</code> and a child is already hovered, then the 1705 * child view will first receive a hover exit event and then the view group 1706 * itself will receive a hover enter event in {@link #onHoverEvent}. 1707 * Likewise, if this method had previously returned <code>true</code> to intercept hover 1708 * events and instead returns <code>false</code> while the pointer is hovering 1709 * within the bounds of one of a child, then the view group will first receive a 1710 * hover exit event in {@link #onHoverEvent} and then the hovered child will 1711 * receive a hover enter event. 1712 * </p><p> 1713 * The default implementation always returns false. 1714 * </p> 1715 * 1716 * @param event The motion event that describes the hover. 1717 * @return True if the view group would like to intercept the hover event 1718 * and prevent its children from receiving it. 1719 */ 1720 public boolean onInterceptHoverEvent(MotionEvent event) { 1721 return false; 1722 } 1723 1724 private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { 1725 if (event.getHistorySize() == 0) { 1726 return event; 1727 } 1728 return MotionEvent.obtainNoHistory(event); 1729 } 1730 1731 /** 1732 * {@inheritDoc} 1733 */ 1734 @Override 1735 protected boolean dispatchGenericPointerEvent(MotionEvent event) { 1736 // Send the event to the child under the pointer. 1737 final int childrenCount = mChildrenCount; 1738 if (childrenCount != 0) { 1739 final View[] children = mChildren; 1740 final float x = event.getX(); 1741 final float y = event.getY(); 1742 1743 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1744 for (int i = childrenCount - 1; i >= 0; i--) { 1745 final int childIndex = customOrder ? getChildDrawingOrder(childrenCount, i) : i; 1746 final View child = children[childIndex]; 1747 if (!canViewReceivePointerEvents(child) 1748 || !isTransformedTouchPointInView(x, y, child, null)) { 1749 continue; 1750 } 1751 1752 if (dispatchTransformedGenericPointerEvent(event, child)) { 1753 return true; 1754 } 1755 } 1756 } 1757 1758 // No child handled the event. Send it to this view group. 1759 return super.dispatchGenericPointerEvent(event); 1760 } 1761 1762 /** 1763 * {@inheritDoc} 1764 */ 1765 @Override 1766 protected boolean dispatchGenericFocusedEvent(MotionEvent event) { 1767 // Send the event to the focused child or to this view group if it has focus. 1768 if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) 1769 == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) { 1770 return super.dispatchGenericFocusedEvent(event); 1771 } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS) 1772 == PFLAG_HAS_BOUNDS) { 1773 return mFocused.dispatchGenericMotionEvent(event); 1774 } 1775 return false; 1776 } 1777 1778 /** 1779 * Dispatches a generic pointer event to a child, taking into account 1780 * transformations that apply to the child. 1781 * 1782 * @param event The event to send. 1783 * @param child The view to send the event to. 1784 * @return {@code true} if the child handled the event. 1785 */ 1786 private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { 1787 final float offsetX = mScrollX - child.mLeft; 1788 final float offsetY = mScrollY - child.mTop; 1789 1790 boolean handled; 1791 if (!child.hasIdentityMatrix()) { 1792 MotionEvent transformedEvent = MotionEvent.obtain(event); 1793 transformedEvent.offsetLocation(offsetX, offsetY); 1794 transformedEvent.transform(child.getInverseMatrix()); 1795 handled = child.dispatchGenericMotionEvent(transformedEvent); 1796 transformedEvent.recycle(); 1797 } else { 1798 event.offsetLocation(offsetX, offsetY); 1799 handled = child.dispatchGenericMotionEvent(event); 1800 event.offsetLocation(-offsetX, -offsetY); 1801 } 1802 return handled; 1803 } 1804 1805 /** 1806 * {@inheritDoc} 1807 */ 1808 @Override 1809 public boolean dispatchTouchEvent(MotionEvent ev) { 1810 if (mInputEventConsistencyVerifier != null) { 1811 mInputEventConsistencyVerifier.onTouchEvent(ev, 1); 1812 } 1813 1814 boolean handled = false; 1815 if (onFilterTouchEventForSecurity(ev)) { 1816 final int action = ev.getAction(); 1817 final int actionMasked = action & MotionEvent.ACTION_MASK; 1818 1819 // Handle an initial down. 1820 if (actionMasked == MotionEvent.ACTION_DOWN) { 1821 // Throw away all previous state when starting a new touch gesture. 1822 // The framework may have dropped the up or cancel event for the previous gesture 1823 // due to an app switch, ANR, or some other state change. 1824 cancelAndClearTouchTargets(ev); 1825 resetTouchState(); 1826 } 1827 1828 // Check for interception. 1829 final boolean intercepted; 1830 if (actionMasked == MotionEvent.ACTION_DOWN 1831 || mFirstTouchTarget != null) { 1832 final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; 1833 if (!disallowIntercept) { 1834 intercepted = onInterceptTouchEvent(ev); 1835 ev.setAction(action); // restore action in case it was changed 1836 } else { 1837 intercepted = false; 1838 } 1839 } else { 1840 // There are no touch targets and this action is not an initial down 1841 // so this view group continues to intercept touches. 1842 intercepted = true; 1843 } 1844 1845 // Check for cancelation. 1846 final boolean canceled = resetCancelNextUpFlag(this) 1847 || actionMasked == MotionEvent.ACTION_CANCEL; 1848 1849 // Update list of touch targets for pointer down, if needed. 1850 final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; 1851 TouchTarget newTouchTarget = null; 1852 boolean alreadyDispatchedToNewTouchTarget = false; 1853 if (!canceled && !intercepted) { 1854 if (actionMasked == MotionEvent.ACTION_DOWN 1855 || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) 1856 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1857 final int actionIndex = ev.getActionIndex(); // always 0 for down 1858 final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) 1859 : TouchTarget.ALL_POINTER_IDS; 1860 1861 // Clean up earlier touch targets for this pointer id in case they 1862 // have become out of sync. 1863 removePointersFromTouchTargets(idBitsToAssign); 1864 1865 final int childrenCount = mChildrenCount; 1866 if (childrenCount != 0) { 1867 // Find a child that can receive the event. 1868 // Scan children from front to back. 1869 final View[] children = mChildren; 1870 final float x = ev.getX(actionIndex); 1871 final float y = ev.getY(actionIndex); 1872 1873 final boolean customOrder = isChildrenDrawingOrderEnabled(); 1874 for (int i = childrenCount - 1; i >= 0; i--) { 1875 final int childIndex = customOrder ? 1876 getChildDrawingOrder(childrenCount, i) : i; 1877 final View child = children[childIndex]; 1878 if (!canViewReceivePointerEvents(child) 1879 || !isTransformedTouchPointInView(x, y, child, null)) { 1880 continue; 1881 } 1882 1883 newTouchTarget = getTouchTarget(child); 1884 if (newTouchTarget != null) { 1885 // Child is already receiving touch within its bounds. 1886 // Give it the new pointer in addition to the ones it is handling. 1887 newTouchTarget.pointerIdBits |= idBitsToAssign; 1888 break; 1889 } 1890 1891 resetCancelNextUpFlag(child); 1892 if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { 1893 // Child wants to receive touch within its bounds. 1894 mLastTouchDownTime = ev.getDownTime(); 1895 mLastTouchDownIndex = childIndex; 1896 mLastTouchDownX = ev.getX(); 1897 mLastTouchDownY = ev.getY(); 1898 newTouchTarget = addTouchTarget(child, idBitsToAssign); 1899 alreadyDispatchedToNewTouchTarget = true; 1900 break; 1901 } 1902 } 1903 } 1904 1905 if (newTouchTarget == null && mFirstTouchTarget != null) { 1906 // Did not find a child to receive the event. 1907 // Assign the pointer to the least recently added target. 1908 newTouchTarget = mFirstTouchTarget; 1909 while (newTouchTarget.next != null) { 1910 newTouchTarget = newTouchTarget.next; 1911 } 1912 newTouchTarget.pointerIdBits |= idBitsToAssign; 1913 } 1914 } 1915 } 1916 1917 // Dispatch to touch targets. 1918 if (mFirstTouchTarget == null) { 1919 // No touch targets so treat this as an ordinary view. 1920 handled = dispatchTransformedTouchEvent(ev, canceled, null, 1921 TouchTarget.ALL_POINTER_IDS); 1922 } else { 1923 // Dispatch to touch targets, excluding the new touch target if we already 1924 // dispatched to it. Cancel touch targets if necessary. 1925 TouchTarget predecessor = null; 1926 TouchTarget target = mFirstTouchTarget; 1927 while (target != null) { 1928 final TouchTarget next = target.next; 1929 if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { 1930 handled = true; 1931 } else { 1932 final boolean cancelChild = resetCancelNextUpFlag(target.child) 1933 || intercepted; 1934 if (dispatchTransformedTouchEvent(ev, cancelChild, 1935 target.child, target.pointerIdBits)) { 1936 handled = true; 1937 } 1938 if (cancelChild) { 1939 if (predecessor == null) { 1940 mFirstTouchTarget = next; 1941 } else { 1942 predecessor.next = next; 1943 } 1944 target.recycle(); 1945 target = next; 1946 continue; 1947 } 1948 } 1949 predecessor = target; 1950 target = next; 1951 } 1952 } 1953 1954 // Update list of touch targets for pointer up or cancel, if needed. 1955 if (canceled 1956 || actionMasked == MotionEvent.ACTION_UP 1957 || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { 1958 resetTouchState(); 1959 } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { 1960 final int actionIndex = ev.getActionIndex(); 1961 final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); 1962 removePointersFromTouchTargets(idBitsToRemove); 1963 } 1964 } 1965 1966 if (!handled && mInputEventConsistencyVerifier != null) { 1967 mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); 1968 } 1969 return handled; 1970 } 1971 1972 /** 1973 * Resets all touch state in preparation for a new cycle. 1974 */ 1975 private void resetTouchState() { 1976 clearTouchTargets(); 1977 resetCancelNextUpFlag(this); 1978 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 1979 } 1980 1981 /** 1982 * Resets the cancel next up flag. 1983 * Returns true if the flag was previously set. 1984 */ 1985 private static boolean resetCancelNextUpFlag(View view) { 1986 if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) { 1987 view.mPrivateFlags &= ~PFLAG_CANCEL_NEXT_UP_EVENT; 1988 return true; 1989 } 1990 return false; 1991 } 1992 1993 /** 1994 * Clears all touch targets. 1995 */ 1996 private void clearTouchTargets() { 1997 TouchTarget target = mFirstTouchTarget; 1998 if (target != null) { 1999 do { 2000 TouchTarget next = target.next; 2001 target.recycle(); 2002 target = next; 2003 } while (target != null); 2004 mFirstTouchTarget = null; 2005 } 2006 } 2007 2008 /** 2009 * Cancels and clears all touch targets. 2010 */ 2011 private void cancelAndClearTouchTargets(MotionEvent event) { 2012 if (mFirstTouchTarget != null) { 2013 boolean syntheticEvent = false; 2014 if (event == null) { 2015 final long now = SystemClock.uptimeMillis(); 2016 event = MotionEvent.obtain(now, now, 2017 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2018 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2019 syntheticEvent = true; 2020 } 2021 2022 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2023 resetCancelNextUpFlag(target.child); 2024 dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); 2025 } 2026 clearTouchTargets(); 2027 2028 if (syntheticEvent) { 2029 event.recycle(); 2030 } 2031 } 2032 } 2033 2034 /** 2035 * Gets the touch target for specified child view. 2036 * Returns null if not found. 2037 */ 2038 private TouchTarget getTouchTarget(View child) { 2039 for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { 2040 if (target.child == child) { 2041 return target; 2042 } 2043 } 2044 return null; 2045 } 2046 2047 /** 2048 * Adds a touch target for specified child to the beginning of the list. 2049 * Assumes the target child is not already present. 2050 */ 2051 private TouchTarget addTouchTarget(View child, int pointerIdBits) { 2052 TouchTarget target = TouchTarget.obtain(child, pointerIdBits); 2053 target.next = mFirstTouchTarget; 2054 mFirstTouchTarget = target; 2055 return target; 2056 } 2057 2058 /** 2059 * Removes the pointer ids from consideration. 2060 */ 2061 private void removePointersFromTouchTargets(int pointerIdBits) { 2062 TouchTarget predecessor = null; 2063 TouchTarget target = mFirstTouchTarget; 2064 while (target != null) { 2065 final TouchTarget next = target.next; 2066 if ((target.pointerIdBits & pointerIdBits) != 0) { 2067 target.pointerIdBits &= ~pointerIdBits; 2068 if (target.pointerIdBits == 0) { 2069 if (predecessor == null) { 2070 mFirstTouchTarget = next; 2071 } else { 2072 predecessor.next = next; 2073 } 2074 target.recycle(); 2075 target = next; 2076 continue; 2077 } 2078 } 2079 predecessor = target; 2080 target = next; 2081 } 2082 } 2083 2084 private void cancelTouchTarget(View view) { 2085 TouchTarget predecessor = null; 2086 TouchTarget target = mFirstTouchTarget; 2087 while (target != null) { 2088 final TouchTarget next = target.next; 2089 if (target.child == view) { 2090 if (predecessor == null) { 2091 mFirstTouchTarget = next; 2092 } else { 2093 predecessor.next = next; 2094 } 2095 target.recycle(); 2096 2097 final long now = SystemClock.uptimeMillis(); 2098 MotionEvent event = MotionEvent.obtain(now, now, 2099 MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); 2100 event.setSource(InputDevice.SOURCE_TOUCHSCREEN); 2101 view.dispatchTouchEvent(event); 2102 event.recycle(); 2103 return; 2104 } 2105 predecessor = target; 2106 target = next; 2107 } 2108 } 2109 2110 /** 2111 * Returns true if a child view can receive pointer events. 2112 * @hide 2113 */ 2114 private static boolean canViewReceivePointerEvents(View child) { 2115 return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE 2116 || child.getAnimation() != null; 2117 } 2118 2119 /** 2120 * Returns true if a child view contains the specified point when transformed 2121 * into its coordinate space. 2122 * Child must not be null. 2123 * @hide 2124 */ 2125 protected boolean isTransformedTouchPointInView(float x, float y, View child, 2126 PointF outLocalPoint) { 2127 float localX = x + mScrollX - child.mLeft; 2128 float localY = y + mScrollY - child.mTop; 2129 if (! child.hasIdentityMatrix() && mAttachInfo != null) { 2130 final float[] localXY = mAttachInfo.mTmpTransformLocation; 2131 localXY[0] = localX; 2132 localXY[1] = localY; 2133 child.getInverseMatrix().mapPoints(localXY); 2134 localX = localXY[0]; 2135 localY = localXY[1]; 2136 } 2137 final boolean isInView = child.pointInView(localX, localY); 2138 if (isInView && outLocalPoint != null) { 2139 outLocalPoint.set(localX, localY); 2140 } 2141 return isInView; 2142 } 2143 2144 /** 2145 * Transforms a motion event into the coordinate space of a particular child view, 2146 * filters out irrelevant pointer ids, and overrides its action if necessary. 2147 * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. 2148 */ 2149 private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, 2150 View child, int desiredPointerIdBits) { 2151 final boolean handled; 2152 2153 // Canceling motions is a special case. We don't need to perform any transformations 2154 // or filtering. The important part is the action, not the contents. 2155 final int oldAction = event.getAction(); 2156 if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { 2157 event.setAction(MotionEvent.ACTION_CANCEL); 2158 if (child == null) { 2159 handled = super.dispatchTouchEvent(event); 2160 } else { 2161 handled = child.dispatchTouchEvent(event); 2162 } 2163 event.setAction(oldAction); 2164 return handled; 2165 } 2166 2167 // Calculate the number of pointers to deliver. 2168 final int oldPointerIdBits = event.getPointerIdBits(); 2169 final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; 2170 2171 // If for some reason we ended up in an inconsistent state where it looks like we 2172 // might produce a motion event with no pointers in it, then drop the event. 2173 if (newPointerIdBits == 0) { 2174 return false; 2175 } 2176 2177 // If the number of pointers is the same and we don't need to perform any fancy 2178 // irreversible transformations, then we can reuse the motion event for this 2179 // dispatch as long as we are careful to revert any changes we make. 2180 // Otherwise we need to make a copy. 2181 final MotionEvent transformedEvent; 2182 if (newPointerIdBits == oldPointerIdBits) { 2183 if (child == null || child.hasIdentityMatrix()) { 2184 if (child == null) { 2185 handled = super.dispatchTouchEvent(event); 2186 } else { 2187 final float offsetX = mScrollX - child.mLeft; 2188 final float offsetY = mScrollY - child.mTop; 2189 event.offsetLocation(offsetX, offsetY); 2190 2191 handled = child.dispatchTouchEvent(event); 2192 2193 event.offsetLocation(-offsetX, -offsetY); 2194 } 2195 return handled; 2196 } 2197 transformedEvent = MotionEvent.obtain(event); 2198 } else { 2199 transformedEvent = event.split(newPointerIdBits); 2200 } 2201 2202 // Perform any necessary transformations and dispatch. 2203 if (child == null) { 2204 handled = super.dispatchTouchEvent(transformedEvent); 2205 } else { 2206 final float offsetX = mScrollX - child.mLeft; 2207 final float offsetY = mScrollY - child.mTop; 2208 transformedEvent.offsetLocation(offsetX, offsetY); 2209 if (! child.hasIdentityMatrix()) { 2210 transformedEvent.transform(child.getInverseMatrix()); 2211 } 2212 2213 handled = child.dispatchTouchEvent(transformedEvent); 2214 } 2215 2216 // Done. 2217 transformedEvent.recycle(); 2218 return handled; 2219 } 2220 2221 /** 2222 * Enable or disable the splitting of MotionEvents to multiple children during touch event 2223 * dispatch. This behavior is enabled by default for applications that target an 2224 * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. 2225 * 2226 * <p>When this option is enabled MotionEvents may be split and dispatched to different child 2227 * views depending on where each pointer initially went down. This allows for user interactions 2228 * such as scrolling two panes of content independently, chording of buttons, and performing 2229 * independent gestures on different pieces of content. 2230 * 2231 * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple 2232 * child views. <code>false</code> to only allow one child view to be the target of 2233 * any MotionEvent received by this ViewGroup. 2234 */ 2235 public void setMotionEventSplittingEnabled(boolean split) { 2236 // TODO Applications really shouldn't change this setting mid-touch event, 2237 // but perhaps this should handle that case and send ACTION_CANCELs to any child views 2238 // with gestures in progress when this is changed. 2239 if (split) { 2240 mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; 2241 } else { 2242 mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; 2243 } 2244 } 2245 2246 /** 2247 * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2248 * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. 2249 */ 2250 public boolean isMotionEventSplittingEnabled() { 2251 return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; 2252 } 2253 2254 /** 2255 * {@inheritDoc} 2256 */ 2257 public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { 2258 2259 if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { 2260 // We're already in this state, assume our ancestors are too 2261 return; 2262 } 2263 2264 if (disallowIntercept) { 2265 mGroupFlags |= FLAG_DISALLOW_INTERCEPT; 2266 } else { 2267 mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; 2268 } 2269 2270 // Pass it up to our parent 2271 if (mParent != null) { 2272 mParent.requestDisallowInterceptTouchEvent(disallowIntercept); 2273 } 2274 } 2275 2276 /** 2277 * Implement this method to intercept all touch screen motion events. This 2278 * allows you to watch events as they are dispatched to your children, and 2279 * take ownership of the current gesture at any point. 2280 * 2281 * <p>Using this function takes some care, as it has a fairly complicated 2282 * interaction with {@link View#onTouchEvent(MotionEvent) 2283 * View.onTouchEvent(MotionEvent)}, and using it requires implementing 2284 * that method as well as this one in the correct way. Events will be 2285 * received in the following order: 2286 * 2287 * <ol> 2288 * <li> You will receive the down event here. 2289 * <li> The down event will be handled either by a child of this view 2290 * group, or given to your own onTouchEvent() method to handle; this means 2291 * you should implement onTouchEvent() to return true, so you will 2292 * continue to see the rest of the gesture (instead of looking for 2293 * a parent view to handle it). Also, by returning true from 2294 * onTouchEvent(), you will not receive any following 2295 * events in onInterceptTouchEvent() and all touch processing must 2296 * happen in onTouchEvent() like normal. 2297 * <li> For as long as you return false from this function, each following 2298 * event (up to and including the final up) will be delivered first here 2299 * and then to the target's onTouchEvent(). 2300 * <li> If you return true from here, you will not receive any 2301 * following events: the target view will receive the same event but 2302 * with the action {@link MotionEvent#ACTION_CANCEL}, and all further 2303 * events will be delivered to your onTouchEvent() method and no longer 2304 * appear here. 2305 * </ol> 2306 * 2307 * @param ev The motion event being dispatched down the hierarchy. 2308 * @return Return true to steal motion events from the children and have 2309 * them dispatched to this ViewGroup through onTouchEvent(). 2310 * The current target will receive an ACTION_CANCEL event, and no further 2311 * messages will be delivered here. 2312 */ 2313 public boolean onInterceptTouchEvent(MotionEvent ev) { 2314 return false; 2315 } 2316 2317 /** 2318 * {@inheritDoc} 2319 * 2320 * Looks for a view to give focus to respecting the setting specified by 2321 * {@link #getDescendantFocusability()}. 2322 * 2323 * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to 2324 * find focus within the children of this group when appropriate. 2325 * 2326 * @see #FOCUS_BEFORE_DESCENDANTS 2327 * @see #FOCUS_AFTER_DESCENDANTS 2328 * @see #FOCUS_BLOCK_DESCENDANTS 2329 * @see #onRequestFocusInDescendants(int, android.graphics.Rect) 2330 */ 2331 @Override 2332 public boolean requestFocus(int direction, Rect previouslyFocusedRect) { 2333 if (DBG) { 2334 System.out.println(this + " ViewGroup.requestFocus direction=" 2335 + direction); 2336 } 2337 int descendantFocusability = getDescendantFocusability(); 2338 2339 switch (descendantFocusability) { 2340 case FOCUS_BLOCK_DESCENDANTS: 2341 return super.requestFocus(direction, previouslyFocusedRect); 2342 case FOCUS_BEFORE_DESCENDANTS: { 2343 final boolean took = super.requestFocus(direction, previouslyFocusedRect); 2344 return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); 2345 } 2346 case FOCUS_AFTER_DESCENDANTS: { 2347 final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); 2348 return took ? took : super.requestFocus(direction, previouslyFocusedRect); 2349 } 2350 default: 2351 throw new IllegalStateException("descendant focusability must be " 2352 + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " 2353 + "but is " + descendantFocusability); 2354 } 2355 } 2356 2357 /** 2358 * Look for a descendant to call {@link View#requestFocus} on. 2359 * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} 2360 * when it wants to request focus within its children. Override this to 2361 * customize how your {@link ViewGroup} requests focus within its children. 2362 * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT 2363 * @param previouslyFocusedRect The rectangle (in this View's coordinate system) 2364 * to give a finer grained hint about where focus is coming from. May be null 2365 * if there is no hint. 2366 * @return Whether focus was taken. 2367 */ 2368 @SuppressWarnings({"ConstantConditions"}) 2369 protected boolean onRequestFocusInDescendants(int direction, 2370 Rect previouslyFocusedRect) { 2371 int index; 2372 int increment; 2373 int end; 2374 int count = mChildrenCount; 2375 if ((direction & FOCUS_FORWARD) != 0) { 2376 index = 0; 2377 increment = 1; 2378 end = count; 2379 } else { 2380 index = count - 1; 2381 increment = -1; 2382 end = -1; 2383 } 2384 final View[] children = mChildren; 2385 for (int i = index; i != end; i += increment) { 2386 View child = children[i]; 2387 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2388 if (child.requestFocus(direction, previouslyFocusedRect)) { 2389 return true; 2390 } 2391 } 2392 } 2393 return false; 2394 } 2395 2396 /** 2397 * {@inheritDoc} 2398 * 2399 * @hide 2400 */ 2401 @Override 2402 public void dispatchStartTemporaryDetach() { 2403 super.dispatchStartTemporaryDetach(); 2404 final int count = mChildrenCount; 2405 final View[] children = mChildren; 2406 for (int i = 0; i < count; i++) { 2407 children[i].dispatchStartTemporaryDetach(); 2408 } 2409 } 2410 2411 /** 2412 * {@inheritDoc} 2413 * 2414 * @hide 2415 */ 2416 @Override 2417 public void dispatchFinishTemporaryDetach() { 2418 super.dispatchFinishTemporaryDetach(); 2419 final int count = mChildrenCount; 2420 final View[] children = mChildren; 2421 for (int i = 0; i < count; i++) { 2422 children[i].dispatchFinishTemporaryDetach(); 2423 } 2424 } 2425 2426 /** 2427 * {@inheritDoc} 2428 */ 2429 @Override 2430 void dispatchAttachedToWindow(AttachInfo info, int visibility) { 2431 mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2432 super.dispatchAttachedToWindow(info, visibility); 2433 mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; 2434 2435 final int count = mChildrenCount; 2436 final View[] children = mChildren; 2437 for (int i = 0; i < count; i++) { 2438 final View child = children[i]; 2439 child.dispatchAttachedToWindow(info, 2440 visibility | (child.mViewFlags & VISIBILITY_MASK)); 2441 } 2442 } 2443 2444 @Override 2445 void dispatchScreenStateChanged(int screenState) { 2446 super.dispatchScreenStateChanged(screenState); 2447 2448 final int count = mChildrenCount; 2449 final View[] children = mChildren; 2450 for (int i = 0; i < count; i++) { 2451 children[i].dispatchScreenStateChanged(screenState); 2452 } 2453 } 2454 2455 @Override 2456 boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { 2457 boolean handled = false; 2458 if (includeForAccessibility()) { 2459 handled = super.dispatchPopulateAccessibilityEventInternal(event); 2460 if (handled) { 2461 return handled; 2462 } 2463 } 2464 // Let our children have a shot in populating the event. 2465 ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true); 2466 try { 2467 final int childCount = children.getChildCount(); 2468 for (int i = 0; i < childCount; i++) { 2469 View child = children.getChildAt(i); 2470 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2471 handled = child.dispatchPopulateAccessibilityEvent(event); 2472 if (handled) { 2473 return handled; 2474 } 2475 } 2476 } 2477 } finally { 2478 children.recycle(); 2479 } 2480 return false; 2481 } 2482 2483 @Override 2484 void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { 2485 super.onInitializeAccessibilityNodeInfoInternal(info); 2486 if (mAttachInfo != null) { 2487 ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList; 2488 childrenForAccessibility.clear(); 2489 addChildrenForAccessibility(childrenForAccessibility); 2490 final int childrenForAccessibilityCount = childrenForAccessibility.size(); 2491 for (int i = 0; i < childrenForAccessibilityCount; i++) { 2492 View child = childrenForAccessibility.get(i); 2493 info.addChild(child); 2494 } 2495 childrenForAccessibility.clear(); 2496 } 2497 } 2498 2499 @Override 2500 void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { 2501 super.onInitializeAccessibilityEventInternal(event); 2502 event.setClassName(ViewGroup.class.getName()); 2503 } 2504 2505 /** 2506 * @hide 2507 */ 2508 @Override 2509 public void resetAccessibilityStateChanged() { 2510 super.resetAccessibilityStateChanged(); 2511 View[] children = mChildren; 2512 final int childCount = mChildrenCount; 2513 for (int i = 0; i < childCount; i++) { 2514 View child = children[i]; 2515 child.resetAccessibilityStateChanged(); 2516 } 2517 } 2518 2519 /** 2520 * {@inheritDoc} 2521 */ 2522 @Override 2523 void dispatchDetachedFromWindow() { 2524 // If we still have a touch target, we are still in the process of 2525 // dispatching motion events to a child; we need to get rid of that 2526 // child to avoid dispatching events to it after the window is torn 2527 // down. To make sure we keep the child in a consistent state, we 2528 // first send it an ACTION_CANCEL motion event. 2529 cancelAndClearTouchTargets(null); 2530 2531 // Similarly, set ACTION_EXIT to all hover targets and clear them. 2532 exitHoverTargets(); 2533 2534 // In case view is detached while transition is running 2535 mLayoutSuppressed = false; 2536 2537 // Tear down our drag tracking 2538 mDragNotifiedChildren = null; 2539 if (mCurrentDrag != null) { 2540 mCurrentDrag.recycle(); 2541 mCurrentDrag = null; 2542 } 2543 2544 final int count = mChildrenCount; 2545 final View[] children = mChildren; 2546 for (int i = 0; i < count; i++) { 2547 children[i].dispatchDetachedFromWindow(); 2548 } 2549 super.dispatchDetachedFromWindow(); 2550 } 2551 2552 /** 2553 * @hide 2554 */ 2555 @Override 2556 protected void internalSetPadding(int left, int top, int right, int bottom) { 2557 super.internalSetPadding(left, top, right, bottom); 2558 2559 if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { 2560 mGroupFlags |= FLAG_PADDING_NOT_NULL; 2561 } else { 2562 mGroupFlags &= ~FLAG_PADDING_NOT_NULL; 2563 } 2564 } 2565 2566 /** 2567 * {@inheritDoc} 2568 */ 2569 @Override 2570 protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { 2571 super.dispatchSaveInstanceState(container); 2572 final int count = mChildrenCount; 2573 final View[] children = mChildren; 2574 for (int i = 0; i < count; i++) { 2575 View c = children[i]; 2576 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2577 c.dispatchSaveInstanceState(container); 2578 } 2579 } 2580 } 2581 2582 /** 2583 * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} 2584 * to only this view, not to its children. For use when overriding 2585 * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow 2586 * subclasses to freeze their own state but not the state of their children. 2587 * 2588 * @param container the container 2589 */ 2590 protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { 2591 super.dispatchSaveInstanceState(container); 2592 } 2593 2594 /** 2595 * {@inheritDoc} 2596 */ 2597 @Override 2598 protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { 2599 super.dispatchRestoreInstanceState(container); 2600 final int count = mChildrenCount; 2601 final View[] children = mChildren; 2602 for (int i = 0; i < count; i++) { 2603 View c = children[i]; 2604 if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { 2605 c.dispatchRestoreInstanceState(container); 2606 } 2607 } 2608 } 2609 2610 /** 2611 * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} 2612 * to only this view, not to its children. For use when overriding 2613 * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow 2614 * subclasses to thaw their own state but not the state of their children. 2615 * 2616 * @param container the container 2617 */ 2618 protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { 2619 super.dispatchRestoreInstanceState(container); 2620 } 2621 2622 /** 2623 * Enables or disables the drawing cache for each child of this view group. 2624 * 2625 * @param enabled true to enable the cache, false to dispose of it 2626 */ 2627 protected void setChildrenDrawingCacheEnabled(boolean enabled) { 2628 if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { 2629 final View[] children = mChildren; 2630 final int count = mChildrenCount; 2631 for (int i = 0; i < count; i++) { 2632 children[i].setDrawingCacheEnabled(enabled); 2633 } 2634 } 2635 } 2636 2637 @Override 2638 protected void onAnimationStart() { 2639 super.onAnimationStart(); 2640 2641 // When this ViewGroup's animation starts, build the cache for the children 2642 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2643 final int count = mChildrenCount; 2644 final View[] children = mChildren; 2645 final boolean buildCache = !isHardwareAccelerated(); 2646 2647 for (int i = 0; i < count; i++) { 2648 final View child = children[i]; 2649 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2650 child.setDrawingCacheEnabled(true); 2651 if (buildCache) { 2652 child.buildDrawingCache(true); 2653 } 2654 } 2655 } 2656 2657 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2658 } 2659 } 2660 2661 @Override 2662 protected void onAnimationEnd() { 2663 super.onAnimationEnd(); 2664 2665 // When this ViewGroup's animation ends, destroy the cache of the children 2666 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2667 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2668 2669 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2670 setChildrenDrawingCacheEnabled(false); 2671 } 2672 } 2673 } 2674 2675 @Override 2676 Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { 2677 int count = mChildrenCount; 2678 int[] visibilities = null; 2679 2680 if (skipChildren) { 2681 visibilities = new int[count]; 2682 for (int i = 0; i < count; i++) { 2683 View child = getChildAt(i); 2684 visibilities[i] = child.getVisibility(); 2685 if (visibilities[i] == View.VISIBLE) { 2686 child.setVisibility(INVISIBLE); 2687 } 2688 } 2689 } 2690 2691 Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); 2692 2693 if (skipChildren) { 2694 for (int i = 0; i < count; i++) { 2695 getChildAt(i).setVisibility(visibilities[i]); 2696 } 2697 } 2698 2699 return b; 2700 } 2701 2702 /** Return true if this ViewGroup is laying out using optical bounds. */ 2703 boolean isLayoutModeOptical() { 2704 return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS; 2705 } 2706 2707 Insets computeOpticalInsets() { 2708 if (isLayoutModeOptical()) { 2709 int left = 0; 2710 int top = 0; 2711 int right = 0; 2712 int bottom = 0; 2713 for (int i = 0; i < mChildrenCount; i++) { 2714 View child = getChildAt(i); 2715 if (child.getVisibility() == VISIBLE) { 2716 Insets insets = child.getOpticalInsets(); 2717 left = Math.max(left, insets.left); 2718 top = Math.max(top, insets.top); 2719 right = Math.max(right, insets.right); 2720 bottom = Math.max(bottom, insets.bottom); 2721 } 2722 } 2723 return Insets.of(left, top, right, bottom); 2724 } else { 2725 return Insets.NONE; 2726 } 2727 } 2728 2729 private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 2730 if (x1 != x2 && y1 != y2) { 2731 if (x1 > x2) { 2732 int tmp = x1; x1 = x2; x2 = tmp; 2733 } 2734 if (y1 > y2) { 2735 int tmp = y1; y1 = y2; y2 = tmp; 2736 } 2737 canvas.drawRect(x1, y1, x2, y2, paint); 2738 } 2739 } 2740 2741 private static int sign(int x) { 2742 return (x >= 0) ? 1 : -1; 2743 } 2744 2745 private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) { 2746 fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy)); 2747 fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy); 2748 } 2749 2750 private int dipsToPixels(int dips) { 2751 float scale = getContext().getResources().getDisplayMetrics().density; 2752 return (int) (dips * scale + 0.5f); 2753 } 2754 2755 private void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint, 2756 int lineLength, int lineWidth) { 2757 drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth); 2758 drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth); 2759 drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth); 2760 drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth); 2761 } 2762 2763 private static void fillDifference(Canvas canvas, 2764 int x2, int y2, int x3, int y3, 2765 int dx1, int dy1, int dx2, int dy2, Paint paint) { 2766 int x1 = x2 - dx1; 2767 int y1 = y2 - dy1; 2768 2769 int x4 = x3 + dx2; 2770 int y4 = y3 + dy2; 2771 2772 fillRect(canvas, paint, x1, y1, x4, y2); 2773 fillRect(canvas, paint, x1, y2, x2, y3); 2774 fillRect(canvas, paint, x3, y2, x4, y3); 2775 fillRect(canvas, paint, x1, y3, x4, y4); 2776 } 2777 2778 /** 2779 * @hide 2780 */ 2781 protected void onDebugDrawMargins(Canvas canvas, Paint paint) { 2782 for (int i = 0; i < getChildCount(); i++) { 2783 View c = getChildAt(i); 2784 c.getLayoutParams().onDebugDraw(c, canvas, paint); 2785 } 2786 } 2787 2788 /** 2789 * @hide 2790 */ 2791 protected void onDebugDraw(Canvas canvas) { 2792 Paint paint = getDebugPaint(); 2793 2794 // Draw optical bounds 2795 { 2796 paint.setColor(Color.RED); 2797 paint.setStyle(Paint.Style.STROKE); 2798 2799 for (int i = 0; i < getChildCount(); i++) { 2800 View c = getChildAt(i); 2801 Insets insets = c.getOpticalInsets(); 2802 2803 drawRect(canvas, paint, 2804 c.getLeft() + insets.left, 2805 c.getTop() + insets.top, 2806 c.getRight() - insets.right - 1, 2807 c.getBottom() - insets.bottom - 1); 2808 } 2809 } 2810 2811 // Draw margins 2812 { 2813 paint.setColor(Color.argb(63, 255, 0, 255)); 2814 paint.setStyle(Paint.Style.FILL); 2815 2816 onDebugDrawMargins(canvas, paint); 2817 } 2818 2819 // Draw clip bounds 2820 { 2821 paint.setColor(Color.rgb(63, 127, 255)); 2822 paint.setStyle(Paint.Style.FILL); 2823 2824 int lineLength = dipsToPixels(8); 2825 int lineWidth = dipsToPixels(1); 2826 for (int i = 0; i < getChildCount(); i++) { 2827 View c = getChildAt(i); 2828 drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(), 2829 paint, lineLength, lineWidth); 2830 } 2831 } 2832 } 2833 2834 /** 2835 * {@inheritDoc} 2836 */ 2837 @Override 2838 protected void dispatchDraw(Canvas canvas) { 2839 final int count = mChildrenCount; 2840 final View[] children = mChildren; 2841 int flags = mGroupFlags; 2842 2843 if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { 2844 final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 2845 2846 final boolean buildCache = !isHardwareAccelerated(); 2847 for (int i = 0; i < count; i++) { 2848 final View child = children[i]; 2849 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { 2850 final LayoutParams params = child.getLayoutParams(); 2851 attachLayoutAnimationParameters(child, params, i, count); 2852 bindLayoutAnimation(child); 2853 if (cache) { 2854 child.setDrawingCacheEnabled(true); 2855 if (buildCache) { 2856 child.buildDrawingCache(true); 2857 } 2858 } 2859 } 2860 } 2861 2862 final LayoutAnimationController controller = mLayoutAnimationController; 2863 if (controller.willOverlap()) { 2864 mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; 2865 } 2866 2867 controller.start(); 2868 2869 mGroupFlags &= ~FLAG_RUN_ANIMATION; 2870 mGroupFlags &= ~FLAG_ANIMATION_DONE; 2871 2872 if (cache) { 2873 mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; 2874 } 2875 2876 if (mAnimationListener != null) { 2877 mAnimationListener.onAnimationStart(controller.getAnimation()); 2878 } 2879 } 2880 2881 int saveCount = 0; 2882 final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; 2883 if (clipToPadding) { 2884 saveCount = canvas.save(); 2885 canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, 2886 mScrollX + mRight - mLeft - mPaddingRight, 2887 mScrollY + mBottom - mTop - mPaddingBottom); 2888 2889 } 2890 2891 // We will draw our child's animation, let's reset the flag 2892 mPrivateFlags &= ~PFLAG_DRAW_ANIMATION; 2893 mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; 2894 2895 boolean more = false; 2896 final long drawingTime = getDrawingTime(); 2897 2898 if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { 2899 for (int i = 0; i < count; i++) { 2900 final View child = children[i]; 2901 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2902 more |= drawChild(canvas, child, drawingTime); 2903 } 2904 } 2905 } else { 2906 for (int i = 0; i < count; i++) { 2907 final View child = children[getChildDrawingOrder(count, i)]; 2908 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 2909 more |= drawChild(canvas, child, drawingTime); 2910 } 2911 } 2912 } 2913 2914 // Draw any disappearing views that have animations 2915 if (mDisappearingChildren != null) { 2916 final ArrayList<View> disappearingChildren = mDisappearingChildren; 2917 final int disappearingCount = disappearingChildren.size() - 1; 2918 // Go backwards -- we may delete as animations finish 2919 for (int i = disappearingCount; i >= 0; i--) { 2920 final View child = disappearingChildren.get(i); 2921 more |= drawChild(canvas, child, drawingTime); 2922 } 2923 } 2924 2925 if (debugDraw()) { 2926 onDebugDraw(canvas); 2927 } 2928 2929 if (clipToPadding) { 2930 canvas.restoreToCount(saveCount); 2931 } 2932 2933 // mGroupFlags might have been updated by drawChild() 2934 flags = mGroupFlags; 2935 2936 if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { 2937 invalidate(true); 2938 } 2939 2940 if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && 2941 mLayoutAnimationController.isDone() && !more) { 2942 // We want to erase the drawing cache and notify the listener after the 2943 // next frame is drawn because one extra invalidate() is caused by 2944 // drawChild() after the animation is over 2945 mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; 2946 final Runnable end = new Runnable() { 2947 public void run() { 2948 notifyAnimationListener(); 2949 } 2950 }; 2951 post(end); 2952 } 2953 } 2954 2955 /** 2956 * Returns the index of the child to draw for this iteration. Override this 2957 * if you want to change the drawing order of children. By default, it 2958 * returns i. 2959 * <p> 2960 * NOTE: In order for this method to be called, you must enable child ordering 2961 * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. 2962 * 2963 * @param i The current iteration. 2964 * @return The index of the child to draw this iteration. 2965 * 2966 * @see #setChildrenDrawingOrderEnabled(boolean) 2967 * @see #isChildrenDrawingOrderEnabled() 2968 */ 2969 protected int getChildDrawingOrder(int childCount, int i) { 2970 return i; 2971 } 2972 2973 private void notifyAnimationListener() { 2974 mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; 2975 mGroupFlags |= FLAG_ANIMATION_DONE; 2976 2977 if (mAnimationListener != null) { 2978 final Runnable end = new Runnable() { 2979 public void run() { 2980 mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); 2981 } 2982 }; 2983 post(end); 2984 } 2985 2986 if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { 2987 mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; 2988 if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { 2989 setChildrenDrawingCacheEnabled(false); 2990 } 2991 } 2992 2993 invalidate(true); 2994 } 2995 2996 /** 2997 * This method is used to cause children of this ViewGroup to restore or recreate their 2998 * display lists. It is called by getDisplayList() when the parent ViewGroup does not need 2999 * to recreate its own display list, which would happen if it went through the normal 3000 * draw/dispatchDraw mechanisms. 3001 * 3002 * @hide 3003 */ 3004 @Override 3005 protected void dispatchGetDisplayList() { 3006 final int count = mChildrenCount; 3007 final View[] children = mChildren; 3008 for (int i = 0; i < count; i++) { 3009 final View child = children[i]; 3010 if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && 3011 child.hasStaticLayer()) { 3012 child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) 3013 == PFLAG_INVALIDATED; 3014 child.mPrivateFlags &= ~PFLAG_INVALIDATED; 3015 child.getDisplayList(); 3016 child.mRecreateDisplayList = false; 3017 } 3018 } 3019 } 3020 3021 /** 3022 * Draw one child of this View Group. This method is responsible for getting 3023 * the canvas in the right state. This includes clipping, translating so 3024 * that the child's scrolled origin is at 0, 0, and applying any animation 3025 * transformations. 3026 * 3027 * @param canvas The canvas on which to draw the child 3028 * @param child Who to draw 3029 * @param drawingTime The time at which draw is occurring 3030 * @return True if an invalidate() was issued 3031 */ 3032 protected boolean drawChild(Canvas canvas, View child, long drawingTime) { 3033 return child.draw(canvas, this, drawingTime); 3034 } 3035 3036 /** 3037 * By default, children are clipped to their bounds before drawing. This 3038 * allows view groups to override this behavior for animations, etc. 3039 * 3040 * @param clipChildren true to clip children to their bounds, 3041 * false otherwise 3042 * @attr ref android.R.styleable#ViewGroup_clipChildren 3043 */ 3044 public void setClipChildren(boolean clipChildren) { 3045 boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; 3046 if (clipChildren != previousValue) { 3047 setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); 3048 for (int i = 0; i < mChildrenCount; ++i) { 3049 View child = getChildAt(i); 3050 if (child.mDisplayList != null) { 3051 child.mDisplayList.setClipChildren(clipChildren); 3052 } 3053 } 3054 } 3055 } 3056 3057 /** 3058 * By default, children are clipped to the padding of the ViewGroup. This 3059 * allows view groups to override this behavior 3060 * 3061 * @param clipToPadding true to clip children to the padding of the 3062 * group, false otherwise 3063 * @attr ref android.R.styleable#ViewGroup_clipToPadding 3064 */ 3065 public void setClipToPadding(boolean clipToPadding) { 3066 setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); 3067 } 3068 3069 /** 3070 * {@inheritDoc} 3071 */ 3072 @Override 3073 public void dispatchSetSelected(boolean selected) { 3074 final View[] children = mChildren; 3075 final int count = mChildrenCount; 3076 for (int i = 0; i < count; i++) { 3077 children[i].setSelected(selected); 3078 } 3079 } 3080 3081 /** 3082 * {@inheritDoc} 3083 */ 3084 @Override 3085 public void dispatchSetActivated(boolean activated) { 3086 final View[] children = mChildren; 3087 final int count = mChildrenCount; 3088 for (int i = 0; i < count; i++) { 3089 children[i].setActivated(activated); 3090 } 3091 } 3092 3093 @Override 3094 protected void dispatchSetPressed(boolean pressed) { 3095 final View[] children = mChildren; 3096 final int count = mChildrenCount; 3097 for (int i = 0; i < count; i++) { 3098 final View child = children[i]; 3099 // Children that are clickable on their own should not 3100 // show a pressed state when their parent view does. 3101 // Clearing a pressed state always propagates. 3102 if (!pressed || (!child.isClickable() && !child.isLongClickable())) { 3103 child.setPressed(pressed); 3104 } 3105 } 3106 } 3107 3108 /** 3109 * When this property is set to true, this ViewGroup supports static transformations on 3110 * children; this causes 3111 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be 3112 * invoked when a child is drawn. 3113 * 3114 * Any subclass overriding 3115 * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should 3116 * set this property to true. 3117 * 3118 * @param enabled True to enable static transformations on children, false otherwise. 3119 * 3120 * @see #getChildStaticTransformation(View, android.view.animation.Transformation) 3121 */ 3122 protected void setStaticTransformationsEnabled(boolean enabled) { 3123 setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); 3124 } 3125 3126 /** 3127 * Sets <code>t</code> to be the static transformation of the child, if set, returning a 3128 * boolean to indicate whether a static transform was set. The default implementation 3129 * simply returns <code>false</code>; subclasses may override this method for different 3130 * behavior. {@link #setStaticTransformationsEnabled(boolean)} must be set to true 3131 * for this method to be called. 3132 * 3133 * @param child The child view whose static transform is being requested 3134 * @param t The Transformation which will hold the result 3135 * @return true if the transformation was set, false otherwise 3136 * @see #setStaticTransformationsEnabled(boolean) 3137 */ 3138 protected boolean getChildStaticTransformation(View child, Transformation t) { 3139 return false; 3140 } 3141 3142 /** 3143 * {@hide} 3144 */ 3145 @Override 3146 protected View findViewTraversal(int id) { 3147 if (id == mID) { 3148 return this; 3149 } 3150 3151 final View[] where = mChildren; 3152 final int len = mChildrenCount; 3153 3154 for (int i = 0; i < len; i++) { 3155 View v = where[i]; 3156 3157 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3158 v = v.findViewById(id); 3159 3160 if (v != null) { 3161 return v; 3162 } 3163 } 3164 } 3165 3166 return null; 3167 } 3168 3169 /** 3170 * {@hide} 3171 */ 3172 @Override 3173 protected View findViewWithTagTraversal(Object tag) { 3174 if (tag != null && tag.equals(mTag)) { 3175 return this; 3176 } 3177 3178 final View[] where = mChildren; 3179 final int len = mChildrenCount; 3180 3181 for (int i = 0; i < len; i++) { 3182 View v = where[i]; 3183 3184 if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3185 v = v.findViewWithTag(tag); 3186 3187 if (v != null) { 3188 return v; 3189 } 3190 } 3191 } 3192 3193 return null; 3194 } 3195 3196 /** 3197 * {@hide} 3198 */ 3199 @Override 3200 protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { 3201 if (predicate.apply(this)) { 3202 return this; 3203 } 3204 3205 final View[] where = mChildren; 3206 final int len = mChildrenCount; 3207 3208 for (int i = 0; i < len; i++) { 3209 View v = where[i]; 3210 3211 if (v != childToSkip && (v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) { 3212 v = v.findViewByPredicate(predicate); 3213 3214 if (v != null) { 3215 return v; 3216 } 3217 } 3218 } 3219 3220 return null; 3221 } 3222 3223 /** 3224 * <p>Adds a child view. If no layout parameters are already set on the child, the 3225 * default parameters for this ViewGroup are set on the child.</p> 3226 * 3227 * <p><strong>Note:</strong> do not invoke this method from 3228 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3229 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3230 * 3231 * @param child the child view to add 3232 * 3233 * @see #generateDefaultLayoutParams() 3234 */ 3235 public void addView(View child) { 3236 addView(child, -1); 3237 } 3238 3239 /** 3240 * Adds a child view. If no layout parameters are already set on the child, the 3241 * default parameters for this ViewGroup are set on the child. 3242 * 3243 * <p><strong>Note:</strong> do not invoke this method from 3244 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3245 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3246 * 3247 * @param child the child view to add 3248 * @param index the position at which to add the child 3249 * 3250 * @see #generateDefaultLayoutParams() 3251 */ 3252 public void addView(View child, int index) { 3253 LayoutParams params = child.getLayoutParams(); 3254 if (params == null) { 3255 params = generateDefaultLayoutParams(); 3256 if (params == null) { 3257 throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); 3258 } 3259 } 3260 addView(child, index, params); 3261 } 3262 3263 /** 3264 * Adds a child view with this ViewGroup's default layout parameters and the 3265 * specified width and height. 3266 * 3267 * <p><strong>Note:</strong> do not invoke this method from 3268 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3269 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3270 * 3271 * @param child the child view to add 3272 */ 3273 public void addView(View child, int width, int height) { 3274 final LayoutParams params = generateDefaultLayoutParams(); 3275 params.width = width; 3276 params.height = height; 3277 addView(child, -1, params); 3278 } 3279 3280 /** 3281 * Adds a child view with the specified layout parameters. 3282 * 3283 * <p><strong>Note:</strong> do not invoke this method from 3284 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3285 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3286 * 3287 * @param child the child view to add 3288 * @param params the layout parameters to set on the child 3289 */ 3290 public void addView(View child, LayoutParams params) { 3291 addView(child, -1, params); 3292 } 3293 3294 /** 3295 * Adds a child view with the specified layout parameters. 3296 * 3297 * <p><strong>Note:</strong> do not invoke this method from 3298 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3299 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3300 * 3301 * @param child the child view to add 3302 * @param index the position at which to add the child 3303 * @param params the layout parameters to set on the child 3304 */ 3305 public void addView(View child, int index, LayoutParams params) { 3306 if (DBG) { 3307 System.out.println(this + " addView"); 3308 } 3309 3310 // addViewInner() will call child.requestLayout() when setting the new LayoutParams 3311 // therefore, we call requestLayout() on ourselves before, so that the child's request 3312 // will be blocked at our level 3313 requestLayout(); 3314 invalidate(true); 3315 addViewInner(child, index, params, false); 3316 } 3317 3318 /** 3319 * {@inheritDoc} 3320 */ 3321 public void updateViewLayout(View view, ViewGroup.LayoutParams params) { 3322 if (!checkLayoutParams(params)) { 3323 throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); 3324 } 3325 if (view.mParent != this) { 3326 throw new IllegalArgumentException("Given view not a child of " + this); 3327 } 3328 view.setLayoutParams(params); 3329 } 3330 3331 /** 3332 * {@inheritDoc} 3333 */ 3334 protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 3335 return p != null; 3336 } 3337 3338 /** 3339 * Interface definition for a callback to be invoked when the hierarchy 3340 * within this view changed. The hierarchy changes whenever a child is added 3341 * to or removed from this view. 3342 */ 3343 public interface OnHierarchyChangeListener { 3344 /** 3345 * Called when a new child is added to a parent view. 3346 * 3347 * @param parent the view in which a child was added 3348 * @param child the new child view added in the hierarchy 3349 */ 3350 void onChildViewAdded(View parent, View child); 3351 3352 /** 3353 * Called when a child is removed from a parent view. 3354 * 3355 * @param parent the view from which the child was removed 3356 * @param child the child removed from the hierarchy 3357 */ 3358 void onChildViewRemoved(View parent, View child); 3359 } 3360 3361 /** 3362 * Register a callback to be invoked when a child is added to or removed 3363 * from this view. 3364 * 3365 * @param listener the callback to invoke on hierarchy change 3366 */ 3367 public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { 3368 mOnHierarchyChangeListener = listener; 3369 } 3370 3371 /** 3372 * @hide 3373 */ 3374 protected void onViewAdded(View child) { 3375 if (mOnHierarchyChangeListener != null) { 3376 mOnHierarchyChangeListener.onChildViewAdded(this, child); 3377 } 3378 } 3379 3380 /** 3381 * @hide 3382 */ 3383 protected void onViewRemoved(View child) { 3384 if (mOnHierarchyChangeListener != null) { 3385 mOnHierarchyChangeListener.onChildViewRemoved(this, child); 3386 } 3387 } 3388 3389 private void clearCachedLayoutMode() { 3390 if (!getBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 3391 mLayoutMode = LAYOUT_MODE_UNDEFINED; 3392 } 3393 } 3394 3395 @Override 3396 protected void onAttachedToWindow() { 3397 super.onAttachedToWindow(); 3398 clearCachedLayoutMode(); 3399 } 3400 3401 @Override 3402 protected void onDetachedFromWindow() { 3403 super.onDetachedFromWindow(); 3404 clearCachedLayoutMode(); 3405 } 3406 3407 /** 3408 * Adds a view during layout. This is useful if in your onLayout() method, 3409 * you need to add more views (as does the list view for example). 3410 * 3411 * If index is negative, it means put it at the end of the list. 3412 * 3413 * @param child the view to add to the group 3414 * @param index the index at which the child must be added 3415 * @param params the layout parameters to associate with the child 3416 * @return true if the child was added, false otherwise 3417 */ 3418 protected boolean addViewInLayout(View child, int index, LayoutParams params) { 3419 return addViewInLayout(child, index, params, false); 3420 } 3421 3422 /** 3423 * Adds a view during layout. This is useful if in your onLayout() method, 3424 * you need to add more views (as does the list view for example). 3425 * 3426 * If index is negative, it means put it at the end of the list. 3427 * 3428 * @param child the view to add to the group 3429 * @param index the index at which the child must be added 3430 * @param params the layout parameters to associate with the child 3431 * @param preventRequestLayout if true, calling this method will not trigger a 3432 * layout request on child 3433 * @return true if the child was added, false otherwise 3434 */ 3435 protected boolean addViewInLayout(View child, int index, LayoutParams params, 3436 boolean preventRequestLayout) { 3437 child.mParent = null; 3438 addViewInner(child, index, params, preventRequestLayout); 3439 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DRAWN; 3440 return true; 3441 } 3442 3443 /** 3444 * Prevents the specified child to be laid out during the next layout pass. 3445 * 3446 * @param child the child on which to perform the cleanup 3447 */ 3448 protected void cleanupLayoutState(View child) { 3449 child.mPrivateFlags &= ~View.PFLAG_FORCE_LAYOUT; 3450 } 3451 3452 private void addViewInner(View child, int index, LayoutParams params, 3453 boolean preventRequestLayout) { 3454 3455 if (mTransition != null) { 3456 // Don't prevent other add transitions from completing, but cancel remove 3457 // transitions to let them complete the process before we add to the container 3458 mTransition.cancel(LayoutTransition.DISAPPEARING); 3459 } 3460 3461 if (child.getParent() != null) { 3462 throw new IllegalStateException("The specified child already has a parent. " + 3463 "You must call removeView() on the child's parent first."); 3464 } 3465 3466 if (mTransition != null) { 3467 mTransition.addChild(this, child); 3468 } 3469 3470 if (!checkLayoutParams(params)) { 3471 params = generateLayoutParams(params); 3472 } 3473 3474 if (preventRequestLayout) { 3475 child.mLayoutParams = params; 3476 } else { 3477 child.setLayoutParams(params); 3478 } 3479 3480 if (index < 0) { 3481 index = mChildrenCount; 3482 } 3483 3484 addInArray(child, index); 3485 3486 // tell our children 3487 if (preventRequestLayout) { 3488 child.assignParent(this); 3489 } else { 3490 child.mParent = this; 3491 } 3492 3493 if (child.hasFocus()) { 3494 requestChildFocus(child, child.findFocus()); 3495 } 3496 3497 AttachInfo ai = mAttachInfo; 3498 if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { 3499 boolean lastKeepOn = ai.mKeepScreenOn; 3500 ai.mKeepScreenOn = false; 3501 child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); 3502 if (ai.mKeepScreenOn) { 3503 needGlobalAttributesUpdate(true); 3504 } 3505 ai.mKeepScreenOn = lastKeepOn; 3506 } 3507 3508 if (child.isLayoutDirectionInherited()) { 3509 child.resetRtlProperties(); 3510 } 3511 3512 onViewAdded(child); 3513 3514 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { 3515 mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; 3516 } 3517 3518 if (child.hasTransientState()) { 3519 childHasTransientStateChanged(child, true); 3520 } 3521 } 3522 3523 private void addInArray(View child, int index) { 3524 View[] children = mChildren; 3525 final int count = mChildrenCount; 3526 final int size = children.length; 3527 if (index == count) { 3528 if (size == count) { 3529 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3530 System.arraycopy(children, 0, mChildren, 0, size); 3531 children = mChildren; 3532 } 3533 children[mChildrenCount++] = child; 3534 } else if (index < count) { 3535 if (size == count) { 3536 mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; 3537 System.arraycopy(children, 0, mChildren, 0, index); 3538 System.arraycopy(children, index, mChildren, index + 1, count - index); 3539 children = mChildren; 3540 } else { 3541 System.arraycopy(children, index, children, index + 1, count - index); 3542 } 3543 children[index] = child; 3544 mChildrenCount++; 3545 if (mLastTouchDownIndex >= index) { 3546 mLastTouchDownIndex++; 3547 } 3548 } else { 3549 throw new IndexOutOfBoundsException("index=" + index + " count=" + count); 3550 } 3551 } 3552 3553 // This method also sets the child's mParent to null 3554 private void removeFromArray(int index) { 3555 final View[] children = mChildren; 3556 if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { 3557 children[index].mParent = null; 3558 } 3559 final int count = mChildrenCount; 3560 if (index == count - 1) { 3561 children[--mChildrenCount] = null; 3562 } else if (index >= 0 && index < count) { 3563 System.arraycopy(children, index + 1, children, index, count - index - 1); 3564 children[--mChildrenCount] = null; 3565 } else { 3566 throw new IndexOutOfBoundsException(); 3567 } 3568 if (mLastTouchDownIndex == index) { 3569 mLastTouchDownTime = 0; 3570 mLastTouchDownIndex = -1; 3571 } else if (mLastTouchDownIndex > index) { 3572 mLastTouchDownIndex--; 3573 } 3574 } 3575 3576 // This method also sets the children's mParent to null 3577 private void removeFromArray(int start, int count) { 3578 final View[] children = mChildren; 3579 final int childrenCount = mChildrenCount; 3580 3581 start = Math.max(0, start); 3582 final int end = Math.min(childrenCount, start + count); 3583 3584 if (start == end) { 3585 return; 3586 } 3587 3588 if (end == childrenCount) { 3589 for (int i = start; i < end; i++) { 3590 children[i].mParent = null; 3591 children[i] = null; 3592 } 3593 } else { 3594 for (int i = start; i < end; i++) { 3595 children[i].mParent = null; 3596 } 3597 3598 // Since we're looping above, we might as well do the copy, but is arraycopy() 3599 // faster than the extra 2 bounds checks we would do in the loop? 3600 System.arraycopy(children, end, children, start, childrenCount - end); 3601 3602 for (int i = childrenCount - (end - start); i < childrenCount; i++) { 3603 children[i] = null; 3604 } 3605 } 3606 3607 mChildrenCount -= (end - start); 3608 } 3609 3610 private void bindLayoutAnimation(View child) { 3611 Animation a = mLayoutAnimationController.getAnimationForView(child); 3612 child.setAnimation(a); 3613 } 3614 3615 /** 3616 * Subclasses should override this method to set layout animation 3617 * parameters on the supplied child. 3618 * 3619 * @param child the child to associate with animation parameters 3620 * @param params the child's layout parameters which hold the animation 3621 * parameters 3622 * @param index the index of the child in the view group 3623 * @param count the number of children in the view group 3624 */ 3625 protected void attachLayoutAnimationParameters(View child, 3626 LayoutParams params, int index, int count) { 3627 LayoutAnimationController.AnimationParameters animationParams = 3628 params.layoutAnimationParameters; 3629 if (animationParams == null) { 3630 animationParams = new LayoutAnimationController.AnimationParameters(); 3631 params.layoutAnimationParameters = animationParams; 3632 } 3633 3634 animationParams.count = count; 3635 animationParams.index = index; 3636 } 3637 3638 /** 3639 * {@inheritDoc} 3640 * 3641 * <p><strong>Note:</strong> do not invoke this method from 3642 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3643 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3644 */ 3645 public void removeView(View view) { 3646 removeViewInternal(view); 3647 requestLayout(); 3648 invalidate(true); 3649 } 3650 3651 /** 3652 * Removes a view during layout. This is useful if in your onLayout() method, 3653 * you need to remove more views. 3654 * 3655 * <p><strong>Note:</strong> do not invoke this method from 3656 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3657 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3658 * 3659 * @param view the view to remove from the group 3660 */ 3661 public void removeViewInLayout(View view) { 3662 removeViewInternal(view); 3663 } 3664 3665 /** 3666 * Removes a range of views during layout. This is useful if in your onLayout() method, 3667 * you need to remove more views. 3668 * 3669 * <p><strong>Note:</strong> do not invoke this method from 3670 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3671 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3672 * 3673 * @param start the index of the first view to remove from the group 3674 * @param count the number of views to remove from the group 3675 */ 3676 public void removeViewsInLayout(int start, int count) { 3677 removeViewsInternal(start, count); 3678 } 3679 3680 /** 3681 * Removes the view at the specified position in the group. 3682 * 3683 * <p><strong>Note:</strong> do not invoke this method from 3684 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3685 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3686 * 3687 * @param index the position in the group of the view to remove 3688 */ 3689 public void removeViewAt(int index) { 3690 removeViewInternal(index, getChildAt(index)); 3691 requestLayout(); 3692 invalidate(true); 3693 } 3694 3695 /** 3696 * Removes the specified range of views from the group. 3697 * 3698 * <p><strong>Note:</strong> do not invoke this method from 3699 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3700 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3701 * 3702 * @param start the first position in the group of the range of views to remove 3703 * @param count the number of views to remove 3704 */ 3705 public void removeViews(int start, int count) { 3706 removeViewsInternal(start, count); 3707 requestLayout(); 3708 invalidate(true); 3709 } 3710 3711 private void removeViewInternal(View view) { 3712 final int index = indexOfChild(view); 3713 if (index >= 0) { 3714 removeViewInternal(index, view); 3715 } 3716 } 3717 3718 private void removeViewInternal(int index, View view) { 3719 3720 if (mTransition != null) { 3721 mTransition.removeChild(this, view); 3722 } 3723 3724 boolean clearChildFocus = false; 3725 if (view == mFocused) { 3726 view.unFocus(); 3727 clearChildFocus = true; 3728 } 3729 3730 if (view.isAccessibilityFocused()) { 3731 view.clearAccessibilityFocus(); 3732 } 3733 3734 cancelTouchTarget(view); 3735 cancelHoverTarget(view); 3736 3737 if (view.getAnimation() != null || 3738 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3739 addDisappearingView(view); 3740 } else if (view.mAttachInfo != null) { 3741 view.dispatchDetachedFromWindow(); 3742 } 3743 3744 if (view.hasTransientState()) { 3745 childHasTransientStateChanged(view, false); 3746 } 3747 3748 needGlobalAttributesUpdate(false); 3749 3750 removeFromArray(index); 3751 3752 if (clearChildFocus) { 3753 clearChildFocus(view); 3754 if (!rootViewRequestFocus()) { 3755 notifyGlobalFocusCleared(this); 3756 } 3757 } 3758 3759 onViewRemoved(view); 3760 } 3761 3762 /** 3763 * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3764 * not null, changes in layout which occur because of children being added to or removed from 3765 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3766 * object. By default, the transition object is null (so layout changes are not animated). 3767 * 3768 * @param transition The LayoutTransition object that will animated changes in layout. A value 3769 * of <code>null</code> means no transition will run on layout changes. 3770 * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges 3771 */ 3772 public void setLayoutTransition(LayoutTransition transition) { 3773 if (mTransition != null) { 3774 mTransition.removeTransitionListener(mLayoutTransitionListener); 3775 } 3776 mTransition = transition; 3777 if (mTransition != null) { 3778 mTransition.addTransitionListener(mLayoutTransitionListener); 3779 } 3780 } 3781 3782 /** 3783 * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is 3784 * not null, changes in layout which occur because of children being added to or removed from 3785 * the ViewGroup will be animated according to the animations defined in that LayoutTransition 3786 * object. By default, the transition object is null (so layout changes are not animated). 3787 * 3788 * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. 3789 * A value of <code>null</code> means no transition will run on layout changes. 3790 */ 3791 public LayoutTransition getLayoutTransition() { 3792 return mTransition; 3793 } 3794 3795 private void removeViewsInternal(int start, int count) { 3796 final View focused = mFocused; 3797 final boolean detach = mAttachInfo != null; 3798 boolean clearChildFocus = false; 3799 3800 final View[] children = mChildren; 3801 final int end = start + count; 3802 3803 for (int i = start; i < end; i++) { 3804 final View view = children[i]; 3805 3806 if (mTransition != null) { 3807 mTransition.removeChild(this, view); 3808 } 3809 3810 if (view == focused) { 3811 view.unFocus(); 3812 clearChildFocus = true; 3813 } 3814 3815 if (view.isAccessibilityFocused()) { 3816 view.clearAccessibilityFocus(); 3817 } 3818 3819 cancelTouchTarget(view); 3820 cancelHoverTarget(view); 3821 3822 if (view.getAnimation() != null || 3823 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3824 addDisappearingView(view); 3825 } else if (detach) { 3826 view.dispatchDetachedFromWindow(); 3827 } 3828 3829 if (view.hasTransientState()) { 3830 childHasTransientStateChanged(view, false); 3831 } 3832 3833 needGlobalAttributesUpdate(false); 3834 3835 onViewRemoved(view); 3836 } 3837 3838 removeFromArray(start, count); 3839 3840 if (clearChildFocus) { 3841 clearChildFocus(focused); 3842 if (!rootViewRequestFocus()) { 3843 notifyGlobalFocusCleared(focused); 3844 } 3845 } 3846 } 3847 3848 /** 3849 * Call this method to remove all child views from the 3850 * ViewGroup. 3851 * 3852 * <p><strong>Note:</strong> do not invoke this method from 3853 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3854 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3855 */ 3856 public void removeAllViews() { 3857 removeAllViewsInLayout(); 3858 requestLayout(); 3859 invalidate(true); 3860 } 3861 3862 /** 3863 * Called by a ViewGroup subclass to remove child views from itself, 3864 * when it must first know its size on screen before it can calculate how many 3865 * child views it will render. An example is a Gallery or a ListView, which 3866 * may "have" 50 children, but actually only render the number of children 3867 * that can currently fit inside the object on screen. Do not call 3868 * this method unless you are extending ViewGroup and understand the 3869 * view measuring and layout pipeline. 3870 * 3871 * <p><strong>Note:</strong> do not invoke this method from 3872 * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)}, 3873 * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p> 3874 */ 3875 public void removeAllViewsInLayout() { 3876 final int count = mChildrenCount; 3877 if (count <= 0) { 3878 return; 3879 } 3880 3881 final View[] children = mChildren; 3882 mChildrenCount = 0; 3883 3884 final View focused = mFocused; 3885 final boolean detach = mAttachInfo != null; 3886 boolean clearChildFocus = false; 3887 3888 needGlobalAttributesUpdate(false); 3889 3890 for (int i = count - 1; i >= 0; i--) { 3891 final View view = children[i]; 3892 3893 if (mTransition != null) { 3894 mTransition.removeChild(this, view); 3895 } 3896 3897 if (view == focused) { 3898 view.unFocus(); 3899 clearChildFocus = true; 3900 } 3901 3902 if (view.isAccessibilityFocused()) { 3903 view.clearAccessibilityFocus(); 3904 } 3905 3906 cancelTouchTarget(view); 3907 cancelHoverTarget(view); 3908 3909 if (view.getAnimation() != null || 3910 (mTransitioningViews != null && mTransitioningViews.contains(view))) { 3911 addDisappearingView(view); 3912 } else if (detach) { 3913 view.dispatchDetachedFromWindow(); 3914 } 3915 3916 if (view.hasTransientState()) { 3917 childHasTransientStateChanged(view, false); 3918 } 3919 3920 onViewRemoved(view); 3921 3922 view.mParent = null; 3923 children[i] = null; 3924 } 3925 3926 if (clearChildFocus) { 3927 clearChildFocus(focused); 3928 if (!rootViewRequestFocus()) { 3929 notifyGlobalFocusCleared(focused); 3930 } 3931 } 3932 } 3933 3934 /** 3935 * Finishes the removal of a detached view. This method will dispatch the detached from 3936 * window event and notify the hierarchy change listener. 3937 * <p> 3938 * This method is intended to be lightweight and makes no assumptions about whether the 3939 * parent or child should be redrawn. Proper use of this method will include also making 3940 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 3941 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 3942 * which performs a {@link #requestLayout()} on the next frame, after all detach/remove 3943 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 3944 * 3945 * @param child the child to be definitely removed from the view hierarchy 3946 * @param animate if true and the view has an animation, the view is placed in the 3947 * disappearing views list, otherwise, it is detached from the window 3948 * 3949 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 3950 * @see #detachAllViewsFromParent() 3951 * @see #detachViewFromParent(View) 3952 * @see #detachViewFromParent(int) 3953 */ 3954 protected void removeDetachedView(View child, boolean animate) { 3955 if (mTransition != null) { 3956 mTransition.removeChild(this, child); 3957 } 3958 3959 if (child == mFocused) { 3960 child.clearFocus(); 3961 } 3962 3963 child.clearAccessibilityFocus(); 3964 3965 cancelTouchTarget(child); 3966 cancelHoverTarget(child); 3967 3968 if ((animate && child.getAnimation() != null) || 3969 (mTransitioningViews != null && mTransitioningViews.contains(child))) { 3970 addDisappearingView(child); 3971 } else if (child.mAttachInfo != null) { 3972 child.dispatchDetachedFromWindow(); 3973 } 3974 3975 if (child.hasTransientState()) { 3976 childHasTransientStateChanged(child, false); 3977 } 3978 3979 onViewRemoved(child); 3980 } 3981 3982 /** 3983 * Attaches a view to this view group. Attaching a view assigns this group as the parent, 3984 * sets the layout parameters and puts the view in the list of children so that 3985 * it can be retrieved by calling {@link #getChildAt(int)}. 3986 * <p> 3987 * This method is intended to be lightweight and makes no assumptions about whether the 3988 * parent or child should be redrawn. Proper use of this method will include also making 3989 * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls. 3990 * For example, callers can {@link #post(Runnable) post} a {@link Runnable} 3991 * which performs a {@link #requestLayout()} on the next frame, after all detach/attach 3992 * calls are finished, causing layout to be run prior to redrawing the view hierarchy. 3993 * <p> 3994 * This method should be called only for views which were detached from their parent. 3995 * 3996 * @param child the child to attach 3997 * @param index the index at which the child should be attached 3998 * @param params the layout parameters of the child 3999 * 4000 * @see #removeDetachedView(View, boolean) 4001 * @see #detachAllViewsFromParent() 4002 * @see #detachViewFromParent(View) 4003 * @see #detachViewFromParent(int) 4004 */ 4005 protected void attachViewToParent(View child, int index, LayoutParams params) { 4006 child.mLayoutParams = params; 4007 4008 if (index < 0) { 4009 index = mChildrenCount; 4010 } 4011 4012 addInArray(child, index); 4013 4014 child.mParent = this; 4015 child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK 4016 & ~PFLAG_DRAWING_CACHE_VALID) 4017 | PFLAG_DRAWN | PFLAG_INVALIDATED; 4018 this.mPrivateFlags |= PFLAG_INVALIDATED; 4019 4020 if (child.hasFocus()) { 4021 requestChildFocus(child, child.findFocus()); 4022 } 4023 } 4024 4025 /** 4026 * Detaches a view from its parent. Detaching a view should be followed 4027 * either by a call to 4028 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4029 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4030 * temporary; reattachment or removal should happen within the same drawing cycle as 4031 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4032 * call to {@link #getChildAt(int)}. 4033 * 4034 * @param child the child to detach 4035 * 4036 * @see #detachViewFromParent(int) 4037 * @see #detachViewsFromParent(int, int) 4038 * @see #detachAllViewsFromParent() 4039 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4040 * @see #removeDetachedView(View, boolean) 4041 */ 4042 protected void detachViewFromParent(View child) { 4043 removeFromArray(indexOfChild(child)); 4044 } 4045 4046 /** 4047 * Detaches a view from its parent. Detaching a view should be followed 4048 * either by a call to 4049 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4050 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4051 * temporary; reattachment or removal should happen within the same drawing cycle as 4052 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4053 * call to {@link #getChildAt(int)}. 4054 * 4055 * @param index the index of the child to detach 4056 * 4057 * @see #detachViewFromParent(View) 4058 * @see #detachAllViewsFromParent() 4059 * @see #detachViewsFromParent(int, int) 4060 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4061 * @see #removeDetachedView(View, boolean) 4062 */ 4063 protected void detachViewFromParent(int index) { 4064 removeFromArray(index); 4065 } 4066 4067 /** 4068 * Detaches a range of views from their parents. Detaching a view should be followed 4069 * either by a call to 4070 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4071 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4072 * temporary; reattachment or removal should happen within the same drawing cycle as 4073 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4074 * call to {@link #getChildAt(int)}. 4075 * 4076 * @param start the first index of the childrend range to detach 4077 * @param count the number of children to detach 4078 * 4079 * @see #detachViewFromParent(View) 4080 * @see #detachViewFromParent(int) 4081 * @see #detachAllViewsFromParent() 4082 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4083 * @see #removeDetachedView(View, boolean) 4084 */ 4085 protected void detachViewsFromParent(int start, int count) { 4086 removeFromArray(start, count); 4087 } 4088 4089 /** 4090 * Detaches all views from the parent. Detaching a view should be followed 4091 * either by a call to 4092 * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} 4093 * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be 4094 * temporary; reattachment or removal should happen within the same drawing cycle as 4095 * detachment. When a view is detached, its parent is null and cannot be retrieved by a 4096 * call to {@link #getChildAt(int)}. 4097 * 4098 * @see #detachViewFromParent(View) 4099 * @see #detachViewFromParent(int) 4100 * @see #detachViewsFromParent(int, int) 4101 * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) 4102 * @see #removeDetachedView(View, boolean) 4103 */ 4104 protected void detachAllViewsFromParent() { 4105 final int count = mChildrenCount; 4106 if (count <= 0) { 4107 return; 4108 } 4109 4110 final View[] children = mChildren; 4111 mChildrenCount = 0; 4112 4113 for (int i = count - 1; i >= 0; i--) { 4114 children[i].mParent = null; 4115 children[i] = null; 4116 } 4117 } 4118 4119 /** 4120 * Don't call or override this method. It is used for the implementation of 4121 * the view hierarchy. 4122 */ 4123 public final void invalidateChild(View child, final Rect dirty) { 4124 ViewParent parent = this; 4125 4126 final AttachInfo attachInfo = mAttachInfo; 4127 if (attachInfo != null) { 4128 // If the child is drawing an animation, we want to copy this flag onto 4129 // ourselves and the parent to make sure the invalidate request goes 4130 // through 4131 final boolean drawAnimation = (child.mPrivateFlags & PFLAG_DRAW_ANIMATION) 4132 == PFLAG_DRAW_ANIMATION; 4133 4134 // Check whether the child that requests the invalidate is fully opaque 4135 // Views being animated or transformed are not considered opaque because we may 4136 // be invalidating their old position and need the parent to paint behind them. 4137 Matrix childMatrix = child.getMatrix(); 4138 final boolean isOpaque = child.isOpaque() && !drawAnimation && 4139 child.getAnimation() == null && childMatrix.isIdentity(); 4140 // Mark the child as dirty, using the appropriate flag 4141 // Make sure we do not set both flags at the same time 4142 int opaqueFlag = isOpaque ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY; 4143 4144 if (child.mLayerType != LAYER_TYPE_NONE) { 4145 mPrivateFlags |= PFLAG_INVALIDATED; 4146 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4147 child.mLocalDirtyRect.union(dirty); 4148 } 4149 4150 final int[] location = attachInfo.mInvalidateChildLocation; 4151 location[CHILD_LEFT_INDEX] = child.mLeft; 4152 location[CHILD_TOP_INDEX] = child.mTop; 4153 if (!childMatrix.isIdentity() || 4154 (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4155 RectF boundingRect = attachInfo.mTmpTransformRect; 4156 boundingRect.set(dirty); 4157 Matrix transformMatrix; 4158 if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) { 4159 Transformation t = attachInfo.mTmpTransformation; 4160 boolean transformed = getChildStaticTransformation(child, t); 4161 if (transformed) { 4162 transformMatrix = attachInfo.mTmpMatrix; 4163 transformMatrix.set(t.getMatrix()); 4164 if (!childMatrix.isIdentity()) { 4165 transformMatrix.preConcat(childMatrix); 4166 } 4167 } else { 4168 transformMatrix = childMatrix; 4169 } 4170 } else { 4171 transformMatrix = childMatrix; 4172 } 4173 transformMatrix.mapRect(boundingRect); 4174 dirty.set((int) (boundingRect.left - 0.5f), 4175 (int) (boundingRect.top - 0.5f), 4176 (int) (boundingRect.right + 0.5f), 4177 (int) (boundingRect.bottom + 0.5f)); 4178 } 4179 4180 do { 4181 View view = null; 4182 if (parent instanceof View) { 4183 view = (View) parent; 4184 } 4185 4186 if (drawAnimation) { 4187 if (view != null) { 4188 view.mPrivateFlags |= PFLAG_DRAW_ANIMATION; 4189 } else if (parent instanceof ViewRootImpl) { 4190 ((ViewRootImpl) parent).mIsAnimating = true; 4191 } 4192 } 4193 4194 // If the parent is dirty opaque or not dirty, mark it dirty with the opaque 4195 // flag coming from the child that initiated the invalidate 4196 if (view != null) { 4197 if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && 4198 view.getSolidColor() == 0) { 4199 opaqueFlag = PFLAG_DIRTY; 4200 } 4201 if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { 4202 view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | opaqueFlag; 4203 } 4204 } 4205 4206 parent = parent.invalidateChildInParent(location, dirty); 4207 if (view != null) { 4208 // Account for transform on current parent 4209 Matrix m = view.getMatrix(); 4210 if (!m.isIdentity()) { 4211 RectF boundingRect = attachInfo.mTmpTransformRect; 4212 boundingRect.set(dirty); 4213 m.mapRect(boundingRect); 4214 dirty.set((int) (boundingRect.left - 0.5f), 4215 (int) (boundingRect.top - 0.5f), 4216 (int) (boundingRect.right + 0.5f), 4217 (int) (boundingRect.bottom + 0.5f)); 4218 } 4219 } 4220 } while (parent != null); 4221 } 4222 } 4223 4224 /** 4225 * Don't call or override this method. It is used for the implementation of 4226 * the view hierarchy. 4227 * 4228 * This implementation returns null if this ViewGroup does not have a parent, 4229 * if this ViewGroup is already fully invalidated or if the dirty rectangle 4230 * does not intersect with this ViewGroup's bounds. 4231 */ 4232 public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { 4233 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4234 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4235 if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != 4236 FLAG_OPTIMIZE_INVALIDATE) { 4237 dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, 4238 location[CHILD_TOP_INDEX] - mScrollY); 4239 4240 final int left = mLeft; 4241 final int top = mTop; 4242 4243 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4244 if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) { 4245 dirty.setEmpty(); 4246 } 4247 } 4248 mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID; 4249 4250 location[CHILD_LEFT_INDEX] = left; 4251 location[CHILD_TOP_INDEX] = top; 4252 4253 if (mLayerType != LAYER_TYPE_NONE) { 4254 mPrivateFlags |= PFLAG_INVALIDATED; 4255 mLocalDirtyRect.union(dirty); 4256 } 4257 4258 return mParent; 4259 4260 } else { 4261 mPrivateFlags &= ~PFLAG_DRAWN & ~PFLAG_DRAWING_CACHE_VALID; 4262 4263 location[CHILD_LEFT_INDEX] = mLeft; 4264 location[CHILD_TOP_INDEX] = mTop; 4265 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { 4266 dirty.set(0, 0, mRight - mLeft, mBottom - mTop); 4267 } else { 4268 // in case the dirty rect extends outside the bounds of this container 4269 dirty.union(0, 0, mRight - mLeft, mBottom - mTop); 4270 } 4271 4272 if (mLayerType != LAYER_TYPE_NONE) { 4273 mPrivateFlags |= PFLAG_INVALIDATED; 4274 mLocalDirtyRect.union(dirty); 4275 } 4276 4277 return mParent; 4278 } 4279 } 4280 4281 return null; 4282 } 4283 4284 /** 4285 * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the 4286 * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods 4287 * do; all we want to do here is schedule a traversal with the appropriate dirty rect. 4288 * 4289 * @hide 4290 */ 4291 public void invalidateChildFast(View child, final Rect dirty) { 4292 ViewParent parent = this; 4293 4294 final AttachInfo attachInfo = mAttachInfo; 4295 if (attachInfo != null) { 4296 if (child.mLayerType != LAYER_TYPE_NONE) { 4297 child.mLocalDirtyRect.union(dirty); 4298 } 4299 4300 int left = child.mLeft; 4301 int top = child.mTop; 4302 if (!child.getMatrix().isIdentity()) { 4303 child.transformRect(dirty); 4304 } 4305 4306 do { 4307 if (parent instanceof ViewGroup) { 4308 ViewGroup parentVG = (ViewGroup) parent; 4309 if (parentVG.mLayerType != LAYER_TYPE_NONE) { 4310 // Layered parents should be recreated, not just re-issued 4311 parentVG.invalidate(); 4312 parent = null; 4313 } else { 4314 parent = parentVG.invalidateChildInParentFast(left, top, dirty); 4315 left = parentVG.mLeft; 4316 top = parentVG.mTop; 4317 } 4318 } else { 4319 // Reached the top; this calls into the usual invalidate method in 4320 // ViewRootImpl, which schedules a traversal 4321 final int[] location = attachInfo.mInvalidateChildLocation; 4322 location[0] = left; 4323 location[1] = top; 4324 parent = parent.invalidateChildInParent(location, dirty); 4325 } 4326 } while (parent != null); 4327 } 4328 } 4329 4330 /** 4331 * Quick invalidation method that simply transforms the dirty rect into the parent's 4332 * coordinate system, pruning the invalidation if the parent has already been invalidated. 4333 */ 4334 private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { 4335 if ((mPrivateFlags & PFLAG_DRAWN) == PFLAG_DRAWN || 4336 (mPrivateFlags & PFLAG_DRAWING_CACHE_VALID) == PFLAG_DRAWING_CACHE_VALID) { 4337 dirty.offset(left - mScrollX, top - mScrollY); 4338 4339 if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || 4340 dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4341 4342 if (mLayerType != LAYER_TYPE_NONE) { 4343 mLocalDirtyRect.union(dirty); 4344 } 4345 if (!getMatrix().isIdentity()) { 4346 transformRect(dirty); 4347 } 4348 4349 return mParent; 4350 } 4351 } 4352 4353 return null; 4354 } 4355 4356 /** 4357 * Offset a rectangle that is in a descendant's coordinate 4358 * space into our coordinate space. 4359 * @param descendant A descendant of this view 4360 * @param rect A rectangle defined in descendant's coordinate space. 4361 */ 4362 public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { 4363 offsetRectBetweenParentAndChild(descendant, rect, true, false); 4364 } 4365 4366 /** 4367 * Offset a rectangle that is in our coordinate space into an ancestor's 4368 * coordinate space. 4369 * @param descendant A descendant of this view 4370 * @param rect A rectangle defined in descendant's coordinate space. 4371 */ 4372 public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { 4373 offsetRectBetweenParentAndChild(descendant, rect, false, false); 4374 } 4375 4376 /** 4377 * Helper method that offsets a rect either from parent to descendant or 4378 * descendant to parent. 4379 */ 4380 void offsetRectBetweenParentAndChild(View descendant, Rect rect, 4381 boolean offsetFromChildToParent, boolean clipToBounds) { 4382 4383 // already in the same coord system :) 4384 if (descendant == this) { 4385 return; 4386 } 4387 4388 ViewParent theParent = descendant.mParent; 4389 4390 // search and offset up to the parent 4391 while ((theParent != null) 4392 && (theParent instanceof View) 4393 && (theParent != this)) { 4394 4395 if (offsetFromChildToParent) { 4396 rect.offset(descendant.mLeft - descendant.mScrollX, 4397 descendant.mTop - descendant.mScrollY); 4398 if (clipToBounds) { 4399 View p = (View) theParent; 4400 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4401 } 4402 } else { 4403 if (clipToBounds) { 4404 View p = (View) theParent; 4405 rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); 4406 } 4407 rect.offset(descendant.mScrollX - descendant.mLeft, 4408 descendant.mScrollY - descendant.mTop); 4409 } 4410 4411 descendant = (View) theParent; 4412 theParent = descendant.mParent; 4413 } 4414 4415 // now that we are up to this view, need to offset one more time 4416 // to get into our coordinate space 4417 if (theParent == this) { 4418 if (offsetFromChildToParent) { 4419 rect.offset(descendant.mLeft - descendant.mScrollX, 4420 descendant.mTop - descendant.mScrollY); 4421 } else { 4422 rect.offset(descendant.mScrollX - descendant.mLeft, 4423 descendant.mScrollY - descendant.mTop); 4424 } 4425 } else { 4426 throw new IllegalArgumentException("parameter must be a descendant of this view"); 4427 } 4428 } 4429 4430 /** 4431 * Offset the vertical location of all children of this view by the specified number of pixels. 4432 * 4433 * @param offset the number of pixels to offset 4434 * 4435 * @hide 4436 */ 4437 public void offsetChildrenTopAndBottom(int offset) { 4438 final int count = mChildrenCount; 4439 final View[] children = mChildren; 4440 4441 for (int i = 0; i < count; i++) { 4442 final View v = children[i]; 4443 v.mTop += offset; 4444 v.mBottom += offset; 4445 if (v.mDisplayList != null) { 4446 v.mDisplayList.offsetTopAndBottom(offset); 4447 invalidateViewProperty(false, false); 4448 } 4449 } 4450 } 4451 4452 /** 4453 * {@inheritDoc} 4454 */ 4455 public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { 4456 // It doesn't make a whole lot of sense to call this on a view that isn't attached, 4457 // but for some simple tests it can be useful. If we don't have attach info this 4458 // will allocate memory. 4459 final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); 4460 rect.set(r); 4461 4462 if (!child.hasIdentityMatrix()) { 4463 child.getMatrix().mapRect(rect); 4464 } 4465 4466 int dx = child.mLeft - mScrollX; 4467 int dy = child.mTop - mScrollY; 4468 4469 rect.offset(dx, dy); 4470 4471 if (offset != null) { 4472 if (!child.hasIdentityMatrix()) { 4473 float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation 4474 : new float[2]; 4475 position[0] = offset.x; 4476 position[1] = offset.y; 4477 child.getMatrix().mapPoints(position); 4478 offset.x = (int) (position[0] + 0.5f); 4479 offset.y = (int) (position[1] + 0.5f); 4480 } 4481 offset.x += dx; 4482 offset.y += dy; 4483 } 4484 4485 if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { 4486 if (mParent == null) return true; 4487 r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), 4488 (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); 4489 return mParent.getChildVisibleRect(this, r, offset); 4490 } 4491 4492 return false; 4493 } 4494 4495 /** 4496 * {@inheritDoc} 4497 */ 4498 @Override 4499 public final void layout(int l, int t, int r, int b) { 4500 if (mTransition == null || !mTransition.isChangingLayout()) { 4501 if (mTransition != null) { 4502 mTransition.layoutChange(this); 4503 } 4504 super.layout(l, t, r, b); 4505 } else { 4506 // record the fact that we noop'd it; request layout when transition finishes 4507 mLayoutSuppressed = true; 4508 } 4509 } 4510 4511 /** 4512 * {@inheritDoc} 4513 */ 4514 @Override 4515 protected abstract void onLayout(boolean changed, 4516 int l, int t, int r, int b); 4517 4518 /** 4519 * Indicates whether the view group has the ability to animate its children 4520 * after the first layout. 4521 * 4522 * @return true if the children can be animated, false otherwise 4523 */ 4524 protected boolean canAnimate() { 4525 return mLayoutAnimationController != null; 4526 } 4527 4528 /** 4529 * Runs the layout animation. Calling this method triggers a relayout of 4530 * this view group. 4531 */ 4532 public void startLayoutAnimation() { 4533 if (mLayoutAnimationController != null) { 4534 mGroupFlags |= FLAG_RUN_ANIMATION; 4535 requestLayout(); 4536 } 4537 } 4538 4539 /** 4540 * Schedules the layout animation to be played after the next layout pass 4541 * of this view group. This can be used to restart the layout animation 4542 * when the content of the view group changes or when the activity is 4543 * paused and resumed. 4544 */ 4545 public void scheduleLayoutAnimation() { 4546 mGroupFlags |= FLAG_RUN_ANIMATION; 4547 } 4548 4549 /** 4550 * Sets the layout animation controller used to animate the group's 4551 * children after the first layout. 4552 * 4553 * @param controller the animation controller 4554 */ 4555 public void setLayoutAnimation(LayoutAnimationController controller) { 4556 mLayoutAnimationController = controller; 4557 if (mLayoutAnimationController != null) { 4558 mGroupFlags |= FLAG_RUN_ANIMATION; 4559 } 4560 } 4561 4562 /** 4563 * Returns the layout animation controller used to animate the group's 4564 * children. 4565 * 4566 * @return the current animation controller 4567 */ 4568 public LayoutAnimationController getLayoutAnimation() { 4569 return mLayoutAnimationController; 4570 } 4571 4572 /** 4573 * Indicates whether the children's drawing cache is used during a layout 4574 * animation. By default, the drawing cache is enabled but this will prevent 4575 * nested layout animations from working. To nest animations, you must disable 4576 * the cache. 4577 * 4578 * @return true if the animation cache is enabled, false otherwise 4579 * 4580 * @see #setAnimationCacheEnabled(boolean) 4581 * @see View#setDrawingCacheEnabled(boolean) 4582 */ 4583 @ViewDebug.ExportedProperty 4584 public boolean isAnimationCacheEnabled() { 4585 return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; 4586 } 4587 4588 /** 4589 * Enables or disables the children's drawing cache during a layout animation. 4590 * By default, the drawing cache is enabled but this will prevent nested 4591 * layout animations from working. To nest animations, you must disable the 4592 * cache. 4593 * 4594 * @param enabled true to enable the animation cache, false otherwise 4595 * 4596 * @see #isAnimationCacheEnabled() 4597 * @see View#setDrawingCacheEnabled(boolean) 4598 */ 4599 public void setAnimationCacheEnabled(boolean enabled) { 4600 setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); 4601 } 4602 4603 /** 4604 * Indicates whether this ViewGroup will always try to draw its children using their 4605 * drawing cache. By default this property is enabled. 4606 * 4607 * @return true if the animation cache is enabled, false otherwise 4608 * 4609 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4610 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4611 * @see View#setDrawingCacheEnabled(boolean) 4612 */ 4613 @ViewDebug.ExportedProperty(category = "drawing") 4614 public boolean isAlwaysDrawnWithCacheEnabled() { 4615 return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; 4616 } 4617 4618 /** 4619 * Indicates whether this ViewGroup will always try to draw its children using their 4620 * drawing cache. This property can be set to true when the cache rendering is 4621 * slightly different from the children's normal rendering. Renderings can be different, 4622 * for instance, when the cache's quality is set to low. 4623 * 4624 * When this property is disabled, the ViewGroup will use the drawing cache of its 4625 * children only when asked to. It's usually the task of subclasses to tell ViewGroup 4626 * when to start using the drawing cache and when to stop using it. 4627 * 4628 * @param always true to always draw with the drawing cache, false otherwise 4629 * 4630 * @see #isAlwaysDrawnWithCacheEnabled() 4631 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4632 * @see View#setDrawingCacheEnabled(boolean) 4633 * @see View#setDrawingCacheQuality(int) 4634 */ 4635 public void setAlwaysDrawnWithCacheEnabled(boolean always) { 4636 setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); 4637 } 4638 4639 /** 4640 * Indicates whether the ViewGroup is currently drawing its children using 4641 * their drawing cache. 4642 * 4643 * @return true if children should be drawn with their cache, false otherwise 4644 * 4645 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4646 * @see #setChildrenDrawnWithCacheEnabled(boolean) 4647 */ 4648 @ViewDebug.ExportedProperty(category = "drawing") 4649 protected boolean isChildrenDrawnWithCacheEnabled() { 4650 return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; 4651 } 4652 4653 /** 4654 * Tells the ViewGroup to draw its children using their drawing cache. This property 4655 * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache 4656 * will be used only if it has been enabled. 4657 * 4658 * Subclasses should call this method to start and stop using the drawing cache when 4659 * they perform performance sensitive operations, like scrolling or animating. 4660 * 4661 * @param enabled true if children should be drawn with their cache, false otherwise 4662 * 4663 * @see #setAlwaysDrawnWithCacheEnabled(boolean) 4664 * @see #isChildrenDrawnWithCacheEnabled() 4665 */ 4666 protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { 4667 setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); 4668 } 4669 4670 /** 4671 * Indicates whether the ViewGroup is drawing its children in the order defined by 4672 * {@link #getChildDrawingOrder(int, int)}. 4673 * 4674 * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, 4675 * false otherwise 4676 * 4677 * @see #setChildrenDrawingOrderEnabled(boolean) 4678 * @see #getChildDrawingOrder(int, int) 4679 */ 4680 @ViewDebug.ExportedProperty(category = "drawing") 4681 protected boolean isChildrenDrawingOrderEnabled() { 4682 return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; 4683 } 4684 4685 /** 4686 * Tells the ViewGroup whether to draw its children in the order defined by the method 4687 * {@link #getChildDrawingOrder(int, int)}. 4688 * 4689 * @param enabled true if the order of the children when drawing is determined by 4690 * {@link #getChildDrawingOrder(int, int)}, false otherwise 4691 * 4692 * @see #isChildrenDrawingOrderEnabled() 4693 * @see #getChildDrawingOrder(int, int) 4694 */ 4695 protected void setChildrenDrawingOrderEnabled(boolean enabled) { 4696 setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); 4697 } 4698 4699 private boolean getBooleanFlag(int flag) { 4700 return (mGroupFlags & flag) == flag; 4701 } 4702 4703 private void setBooleanFlag(int flag, boolean value) { 4704 if (value) { 4705 mGroupFlags |= flag; 4706 } else { 4707 mGroupFlags &= ~flag; 4708 } 4709 } 4710 4711 /** 4712 * Returns an integer indicating what types of drawing caches are kept in memory. 4713 * 4714 * @see #setPersistentDrawingCache(int) 4715 * @see #setAnimationCacheEnabled(boolean) 4716 * 4717 * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, 4718 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4719 * and {@link #PERSISTENT_ALL_CACHES} 4720 */ 4721 @ViewDebug.ExportedProperty(category = "drawing", mapping = { 4722 @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), 4723 @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), 4724 @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), 4725 @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") 4726 }) 4727 public int getPersistentDrawingCache() { 4728 return mPersistentDrawingCache; 4729 } 4730 4731 /** 4732 * Indicates what types of drawing caches should be kept in memory after 4733 * they have been created. 4734 * 4735 * @see #getPersistentDrawingCache() 4736 * @see #setAnimationCacheEnabled(boolean) 4737 * 4738 * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, 4739 * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} 4740 * and {@link #PERSISTENT_ALL_CACHES} 4741 */ 4742 public void setPersistentDrawingCache(int drawingCacheToKeep) { 4743 mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; 4744 } 4745 4746 private void setLayoutMode(int layoutMode, boolean explicitly) { 4747 mLayoutMode = layoutMode; 4748 setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly); 4749 } 4750 4751 /** 4752 * Recursively traverse the view hierarchy, resetting the layoutMode of any 4753 * descendants that had inherited a different layoutMode from a previous parent. 4754 * Recursion terminates when a descendant's mode is: 4755 * <ul> 4756 * <li>Undefined</li> 4757 * <li>The same as the root node's</li> 4758 * <li>A mode that had been explicitly set</li> 4759 * <ul/> 4760 * The first two clauses are optimizations. 4761 * @param layoutModeOfRoot 4762 */ 4763 @Override 4764 void invalidateInheritedLayoutMode(int layoutModeOfRoot) { 4765 if (mLayoutMode == LAYOUT_MODE_UNDEFINED || 4766 mLayoutMode == layoutModeOfRoot || 4767 getBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) { 4768 return; 4769 } 4770 setLayoutMode(LAYOUT_MODE_UNDEFINED, false); 4771 4772 // apply recursively 4773 for (int i = 0, N = getChildCount(); i < N; i++) { 4774 getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot); 4775 } 4776 } 4777 4778 /** 4779 * Returns the basis of alignment during layout operations on this ViewGroup: 4780 * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4781 * <p> 4782 * If no layoutMode was explicitly set, either programmatically or in an XML resource, 4783 * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists, 4784 * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}. 4785 * 4786 * @return the layout mode to use during layout operations 4787 * 4788 * @see #setLayoutMode(int) 4789 */ 4790 public int getLayoutMode() { 4791 if (mLayoutMode == LAYOUT_MODE_UNDEFINED) { 4792 int inheritedLayoutMode = (mParent instanceof ViewGroup) ? 4793 ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT; 4794 setLayoutMode(inheritedLayoutMode, false); 4795 } 4796 return mLayoutMode; 4797 } 4798 4799 /** 4800 * Sets the basis of alignment during the layout of this ViewGroup. 4801 * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or 4802 * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}. 4803 * 4804 * @param layoutMode the layout mode to use during layout operations 4805 * 4806 * @see #getLayoutMode() 4807 */ 4808 public void setLayoutMode(int layoutMode) { 4809 if (mLayoutMode != layoutMode) { 4810 invalidateInheritedLayoutMode(layoutMode); 4811 setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED); 4812 requestLayout(); 4813 } 4814 } 4815 4816 /** 4817 * Returns a new set of layout parameters based on the supplied attributes set. 4818 * 4819 * @param attrs the attributes to build the layout parameters from 4820 * 4821 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4822 * of its descendants 4823 */ 4824 public LayoutParams generateLayoutParams(AttributeSet attrs) { 4825 return new LayoutParams(getContext(), attrs); 4826 } 4827 4828 /** 4829 * Returns a safe set of layout parameters based on the supplied layout params. 4830 * When a ViewGroup is passed a View whose layout params do not pass the test of 4831 * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method 4832 * is invoked. This method should return a new set of layout params suitable for 4833 * this ViewGroup, possibly by copying the appropriate attributes from the 4834 * specified set of layout params. 4835 * 4836 * @param p The layout parameters to convert into a suitable set of layout parameters 4837 * for this ViewGroup. 4838 * 4839 * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one 4840 * of its descendants 4841 */ 4842 protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { 4843 return p; 4844 } 4845 4846 /** 4847 * Returns a set of default layout parameters. These parameters are requested 4848 * when the View passed to {@link #addView(View)} has no layout parameters 4849 * already set. If null is returned, an exception is thrown from addView. 4850 * 4851 * @return a set of default layout parameters or null 4852 */ 4853 protected LayoutParams generateDefaultLayoutParams() { 4854 return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 4855 } 4856 4857 /** 4858 * {@inheritDoc} 4859 */ 4860 @Override 4861 protected void debug(int depth) { 4862 super.debug(depth); 4863 String output; 4864 4865 if (mFocused != null) { 4866 output = debugIndent(depth); 4867 output += "mFocused"; 4868 Log.d(VIEW_LOG_TAG, output); 4869 } 4870 if (mChildrenCount != 0) { 4871 output = debugIndent(depth); 4872 output += "{"; 4873 Log.d(VIEW_LOG_TAG, output); 4874 } 4875 int count = mChildrenCount; 4876 for (int i = 0; i < count; i++) { 4877 View child = mChildren[i]; 4878 child.debug(depth + 1); 4879 } 4880 4881 if (mChildrenCount != 0) { 4882 output = debugIndent(depth); 4883 output += "}"; 4884 Log.d(VIEW_LOG_TAG, output); 4885 } 4886 } 4887 4888 /** 4889 * Returns the position in the group of the specified child view. 4890 * 4891 * @param child the view for which to get the position 4892 * @return a positive integer representing the position of the view in the 4893 * group, or -1 if the view does not exist in the group 4894 */ 4895 public int indexOfChild(View child) { 4896 final int count = mChildrenCount; 4897 final View[] children = mChildren; 4898 for (int i = 0; i < count; i++) { 4899 if (children[i] == child) { 4900 return i; 4901 } 4902 } 4903 return -1; 4904 } 4905 4906 /** 4907 * Returns the number of children in the group. 4908 * 4909 * @return a positive integer representing the number of children in 4910 * the group 4911 */ 4912 public int getChildCount() { 4913 return mChildrenCount; 4914 } 4915 4916 /** 4917 * Returns the view at the specified position in the group. 4918 * 4919 * @param index the position at which to get the view from 4920 * @return the view at the specified position or null if the position 4921 * does not exist within the group 4922 */ 4923 public View getChildAt(int index) { 4924 if (index < 0 || index >= mChildrenCount) { 4925 return null; 4926 } 4927 return mChildren[index]; 4928 } 4929 4930 /** 4931 * Ask all of the children of this view to measure themselves, taking into 4932 * account both the MeasureSpec requirements for this view and its padding. 4933 * We skip children that are in the GONE state The heavy lifting is done in 4934 * getChildMeasureSpec. 4935 * 4936 * @param widthMeasureSpec The width requirements for this view 4937 * @param heightMeasureSpec The height requirements for this view 4938 */ 4939 protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { 4940 final int size = mChildrenCount; 4941 final View[] children = mChildren; 4942 for (int i = 0; i < size; ++i) { 4943 final View child = children[i]; 4944 if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { 4945 measureChild(child, widthMeasureSpec, heightMeasureSpec); 4946 } 4947 } 4948 } 4949 4950 /** 4951 * Ask one of the children of this view to measure itself, taking into 4952 * account both the MeasureSpec requirements for this view and its padding. 4953 * The heavy lifting is done in getChildMeasureSpec. 4954 * 4955 * @param child The child to measure 4956 * @param parentWidthMeasureSpec The width requirements for this view 4957 * @param parentHeightMeasureSpec The height requirements for this view 4958 */ 4959 protected void measureChild(View child, int parentWidthMeasureSpec, 4960 int parentHeightMeasureSpec) { 4961 final LayoutParams lp = child.getLayoutParams(); 4962 4963 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4964 mPaddingLeft + mPaddingRight, lp.width); 4965 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4966 mPaddingTop + mPaddingBottom, lp.height); 4967 4968 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4969 } 4970 4971 /** 4972 * Ask one of the children of this view to measure itself, taking into 4973 * account both the MeasureSpec requirements for this view and its padding 4974 * and margins. The child must have MarginLayoutParams The heavy lifting is 4975 * done in getChildMeasureSpec. 4976 * 4977 * @param child The child to measure 4978 * @param parentWidthMeasureSpec The width requirements for this view 4979 * @param widthUsed Extra space that has been used up by the parent 4980 * horizontally (possibly by other children of the parent) 4981 * @param parentHeightMeasureSpec The height requirements for this view 4982 * @param heightUsed Extra space that has been used up by the parent 4983 * vertically (possibly by other children of the parent) 4984 */ 4985 protected void measureChildWithMargins(View child, 4986 int parentWidthMeasureSpec, int widthUsed, 4987 int parentHeightMeasureSpec, int heightUsed) { 4988 final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); 4989 4990 final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, 4991 mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin 4992 + widthUsed, lp.width); 4993 final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, 4994 mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin 4995 + heightUsed, lp.height); 4996 4997 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 4998 } 4999 5000 /** 5001 * Does the hard part of measureChildren: figuring out the MeasureSpec to 5002 * pass to a particular child. This method figures out the right MeasureSpec 5003 * for one dimension (height or width) of one child view. 5004 * 5005 * The goal is to combine information from our MeasureSpec with the 5006 * LayoutParams of the child to get the best possible results. For example, 5007 * if the this view knows its size (because its MeasureSpec has a mode of 5008 * EXACTLY), and the child has indicated in its LayoutParams that it wants 5009 * to be the same size as the parent, the parent should ask the child to 5010 * layout given an exact size. 5011 * 5012 * @param spec The requirements for this view 5013 * @param padding The padding of this view for the current dimension and 5014 * margins, if applicable 5015 * @param childDimension How big the child wants to be in the current 5016 * dimension 5017 * @return a MeasureSpec integer for the child 5018 */ 5019 public static int getChildMeasureSpec(int spec, int padding, int childDimension) { 5020 int specMode = MeasureSpec.getMode(spec); 5021 int specSize = MeasureSpec.getSize(spec); 5022 5023 int size = Math.max(0, specSize - padding); 5024 5025 int resultSize = 0; 5026 int resultMode = 0; 5027 5028 switch (specMode) { 5029 // Parent has imposed an exact size on us 5030 case MeasureSpec.EXACTLY: 5031 if (childDimension >= 0) { 5032 resultSize = childDimension; 5033 resultMode = MeasureSpec.EXACTLY; 5034 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5035 // Child wants to be our size. So be it. 5036 resultSize = size; 5037 resultMode = MeasureSpec.EXACTLY; 5038 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5039 // Child wants to determine its own size. It can't be 5040 // bigger than us. 5041 resultSize = size; 5042 resultMode = MeasureSpec.AT_MOST; 5043 } 5044 break; 5045 5046 // Parent has imposed a maximum size on us 5047 case MeasureSpec.AT_MOST: 5048 if (childDimension >= 0) { 5049 // Child wants a specific size... so be it 5050 resultSize = childDimension; 5051 resultMode = MeasureSpec.EXACTLY; 5052 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5053 // Child wants to be our size, but our size is not fixed. 5054 // Constrain child to not be bigger than us. 5055 resultSize = size; 5056 resultMode = MeasureSpec.AT_MOST; 5057 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5058 // Child wants to determine its own size. It can't be 5059 // bigger than us. 5060 resultSize = size; 5061 resultMode = MeasureSpec.AT_MOST; 5062 } 5063 break; 5064 5065 // Parent asked to see how big we want to be 5066 case MeasureSpec.UNSPECIFIED: 5067 if (childDimension >= 0) { 5068 // Child wants a specific size... let him have it 5069 resultSize = childDimension; 5070 resultMode = MeasureSpec.EXACTLY; 5071 } else if (childDimension == LayoutParams.MATCH_PARENT) { 5072 // Child wants to be our size... find out how big it should 5073 // be 5074 resultSize = 0; 5075 resultMode = MeasureSpec.UNSPECIFIED; 5076 } else if (childDimension == LayoutParams.WRAP_CONTENT) { 5077 // Child wants to determine its own size.... find out how 5078 // big it should be 5079 resultSize = 0; 5080 resultMode = MeasureSpec.UNSPECIFIED; 5081 } 5082 break; 5083 } 5084 return MeasureSpec.makeMeasureSpec(resultSize, resultMode); 5085 } 5086 5087 5088 /** 5089 * Removes any pending animations for views that have been removed. Call 5090 * this if you don't want animations for exiting views to stack up. 5091 */ 5092 public void clearDisappearingChildren() { 5093 if (mDisappearingChildren != null) { 5094 mDisappearingChildren.clear(); 5095 invalidate(); 5096 } 5097 } 5098 5099 /** 5100 * Add a view which is removed from mChildren but still needs animation 5101 * 5102 * @param v View to add 5103 */ 5104 private void addDisappearingView(View v) { 5105 ArrayList<View> disappearingChildren = mDisappearingChildren; 5106 5107 if (disappearingChildren == null) { 5108 disappearingChildren = mDisappearingChildren = new ArrayList<View>(); 5109 } 5110 5111 disappearingChildren.add(v); 5112 } 5113 5114 /** 5115 * Cleanup a view when its animation is done. This may mean removing it from 5116 * the list of disappearing views. 5117 * 5118 * @param view The view whose animation has finished 5119 * @param animation The animation, cannot be null 5120 */ 5121 void finishAnimatingView(final View view, Animation animation) { 5122 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5123 if (disappearingChildren != null) { 5124 if (disappearingChildren.contains(view)) { 5125 disappearingChildren.remove(view); 5126 5127 if (view.mAttachInfo != null) { 5128 view.dispatchDetachedFromWindow(); 5129 } 5130 5131 view.clearAnimation(); 5132 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5133 } 5134 } 5135 5136 if (animation != null && !animation.getFillAfter()) { 5137 view.clearAnimation(); 5138 } 5139 5140 if ((view.mPrivateFlags & PFLAG_ANIMATION_STARTED) == PFLAG_ANIMATION_STARTED) { 5141 view.onAnimationEnd(); 5142 // Should be performed by onAnimationEnd() but this avoid an infinite loop, 5143 // so we'd rather be safe than sorry 5144 view.mPrivateFlags &= ~PFLAG_ANIMATION_STARTED; 5145 // Draw one more frame after the animation is done 5146 mGroupFlags |= FLAG_INVALIDATE_REQUIRED; 5147 } 5148 } 5149 5150 /** 5151 * Utility function called by View during invalidation to determine whether a view that 5152 * is invisible or gone should still be invalidated because it is being transitioned (and 5153 * therefore still needs to be drawn). 5154 */ 5155 boolean isViewTransitioning(View view) { 5156 return (mTransitioningViews != null && mTransitioningViews.contains(view)); 5157 } 5158 5159 /** 5160 * This method tells the ViewGroup that the given View object, which should have this 5161 * ViewGroup as its parent, 5162 * should be kept around (re-displayed when the ViewGroup draws its children) even if it 5163 * is removed from its parent. This allows animations, such as those used by 5164 * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate 5165 * the removal of views. A call to this method should always be accompanied by a later call 5166 * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, 5167 * so that the View finally gets removed. 5168 * 5169 * @param view The View object to be kept visible even if it gets removed from its parent. 5170 */ 5171 public void startViewTransition(View view) { 5172 if (view.mParent == this) { 5173 if (mTransitioningViews == null) { 5174 mTransitioningViews = new ArrayList<View>(); 5175 } 5176 mTransitioningViews.add(view); 5177 } 5178 } 5179 5180 /** 5181 * This method should always be called following an earlier call to 5182 * {@link #startViewTransition(View)}. The given View is finally removed from its parent 5183 * and will no longer be displayed. Note that this method does not perform the functionality 5184 * of removing a view from its parent; it just discontinues the display of a View that 5185 * has previously been removed. 5186 * 5187 * @return view The View object that has been removed but is being kept around in the visible 5188 * hierarchy by an earlier call to {@link #startViewTransition(View)}. 5189 */ 5190 public void endViewTransition(View view) { 5191 if (mTransitioningViews != null) { 5192 mTransitioningViews.remove(view); 5193 final ArrayList<View> disappearingChildren = mDisappearingChildren; 5194 if (disappearingChildren != null && disappearingChildren.contains(view)) { 5195 disappearingChildren.remove(view); 5196 if (mVisibilityChangingChildren != null && 5197 mVisibilityChangingChildren.contains(view)) { 5198 mVisibilityChangingChildren.remove(view); 5199 } else { 5200 if (view.mAttachInfo != null) { 5201 view.dispatchDetachedFromWindow(); 5202 } 5203 if (view.mParent != null) { 5204 view.mParent = null; 5205 } 5206 } 5207 invalidate(); 5208 } 5209 } 5210 } 5211 5212 private LayoutTransition.TransitionListener mLayoutTransitionListener = 5213 new LayoutTransition.TransitionListener() { 5214 @Override 5215 public void startTransition(LayoutTransition transition, ViewGroup container, 5216 View view, int transitionType) { 5217 // We only care about disappearing items, since we need special logic to keep 5218 // those items visible after they've been 'removed' 5219 if (transitionType == LayoutTransition.DISAPPEARING) { 5220 startViewTransition(view); 5221 } 5222 } 5223 5224 @Override 5225 public void endTransition(LayoutTransition transition, ViewGroup container, 5226 View view, int transitionType) { 5227 if (mLayoutSuppressed && !transition.isChangingLayout()) { 5228 requestLayout(); 5229 mLayoutSuppressed = false; 5230 } 5231 if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { 5232 endViewTransition(view); 5233 } 5234 } 5235 }; 5236 5237 /** 5238 * {@inheritDoc} 5239 */ 5240 @Override 5241 public boolean gatherTransparentRegion(Region region) { 5242 // If no transparent regions requested, we are always opaque. 5243 final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0; 5244 if (meOpaque && region == null) { 5245 // The caller doesn't care about the region, so stop now. 5246 return true; 5247 } 5248 super.gatherTransparentRegion(region); 5249 final View[] children = mChildren; 5250 final int count = mChildrenCount; 5251 boolean noneOfTheChildrenAreTransparent = true; 5252 for (int i = 0; i < count; i++) { 5253 final View child = children[i]; 5254 if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { 5255 if (!child.gatherTransparentRegion(region)) { 5256 noneOfTheChildrenAreTransparent = false; 5257 } 5258 } 5259 } 5260 return meOpaque || noneOfTheChildrenAreTransparent; 5261 } 5262 5263 /** 5264 * {@inheritDoc} 5265 */ 5266 public void requestTransparentRegion(View child) { 5267 if (child != null) { 5268 child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS; 5269 if (mParent != null) { 5270 mParent.requestTransparentRegion(this); 5271 } 5272 } 5273 } 5274 5275 5276 @Override 5277 protected boolean fitSystemWindows(Rect insets) { 5278 boolean done = super.fitSystemWindows(insets); 5279 if (!done) { 5280 final int count = mChildrenCount; 5281 final View[] children = mChildren; 5282 for (int i = 0; i < count; i++) { 5283 done = children[i].fitSystemWindows(insets); 5284 if (done) { 5285 break; 5286 } 5287 } 5288 } 5289 return done; 5290 } 5291 5292 /** 5293 * Returns the animation listener to which layout animation events are 5294 * sent. 5295 * 5296 * @return an {@link android.view.animation.Animation.AnimationListener} 5297 */ 5298 public Animation.AnimationListener getLayoutAnimationListener() { 5299 return mAnimationListener; 5300 } 5301 5302 @Override 5303 protected void drawableStateChanged() { 5304 super.drawableStateChanged(); 5305 5306 if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { 5307 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5308 throw new IllegalStateException("addStateFromChildren cannot be enabled if a" 5309 + " child has duplicateParentState set to true"); 5310 } 5311 5312 final View[] children = mChildren; 5313 final int count = mChildrenCount; 5314 5315 for (int i = 0; i < count; i++) { 5316 final View child = children[i]; 5317 if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { 5318 child.refreshDrawableState(); 5319 } 5320 } 5321 } 5322 } 5323 5324 @Override 5325 public void jumpDrawablesToCurrentState() { 5326 super.jumpDrawablesToCurrentState(); 5327 final View[] children = mChildren; 5328 final int count = mChildrenCount; 5329 for (int i = 0; i < count; i++) { 5330 children[i].jumpDrawablesToCurrentState(); 5331 } 5332 } 5333 5334 @Override 5335 protected int[] onCreateDrawableState(int extraSpace) { 5336 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { 5337 return super.onCreateDrawableState(extraSpace); 5338 } 5339 5340 int need = 0; 5341 int n = getChildCount(); 5342 for (int i = 0; i < n; i++) { 5343 int[] childState = getChildAt(i).getDrawableState(); 5344 5345 if (childState != null) { 5346 need += childState.length; 5347 } 5348 } 5349 5350 int[] state = super.onCreateDrawableState(extraSpace + need); 5351 5352 for (int i = 0; i < n; i++) { 5353 int[] childState = getChildAt(i).getDrawableState(); 5354 5355 if (childState != null) { 5356 state = mergeDrawableStates(state, childState); 5357 } 5358 } 5359 5360 return state; 5361 } 5362 5363 /** 5364 * Sets whether this ViewGroup's drawable states also include 5365 * its children's drawable states. This is used, for example, to 5366 * make a group appear to be focused when its child EditText or button 5367 * is focused. 5368 */ 5369 public void setAddStatesFromChildren(boolean addsStates) { 5370 if (addsStates) { 5371 mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; 5372 } else { 5373 mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; 5374 } 5375 5376 refreshDrawableState(); 5377 } 5378 5379 /** 5380 * Returns whether this ViewGroup's drawable states also include 5381 * its children's drawable states. This is used, for example, to 5382 * make a group appear to be focused when its child EditText or button 5383 * is focused. 5384 */ 5385 public boolean addStatesFromChildren() { 5386 return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; 5387 } 5388 5389 /** 5390 * If {@link #addStatesFromChildren} is true, refreshes this group's 5391 * drawable state (to include the states from its children). 5392 */ 5393 public void childDrawableStateChanged(View child) { 5394 if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { 5395 refreshDrawableState(); 5396 } 5397 } 5398 5399 /** 5400 * Specifies the animation listener to which layout animation events must 5401 * be sent. Only 5402 * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} 5403 * and 5404 * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} 5405 * are invoked. 5406 * 5407 * @param animationListener the layout animation listener 5408 */ 5409 public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { 5410 mAnimationListener = animationListener; 5411 } 5412 5413 /** 5414 * This method is called by LayoutTransition when there are 'changing' animations that need 5415 * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who 5416 * starts all pending transitions prior to the drawing phase in the current traversal. 5417 * 5418 * @param transition The LayoutTransition to be started on the next traversal. 5419 * 5420 * @hide 5421 */ 5422 public void requestTransitionStart(LayoutTransition transition) { 5423 ViewRootImpl viewAncestor = getViewRootImpl(); 5424 if (viewAncestor != null) { 5425 viewAncestor.requestTransitionStart(transition); 5426 } 5427 } 5428 5429 /** 5430 * @hide 5431 */ 5432 @Override 5433 public void resolveRtlPropertiesIfNeeded() { 5434 super.resolveRtlPropertiesIfNeeded(); 5435 int count = getChildCount(); 5436 for (int i = 0; i < count; i++) { 5437 final View child = getChildAt(i); 5438 if (child.isLayoutDirectionInherited()) { 5439 child.resolveRtlPropertiesIfNeeded(); 5440 } 5441 } 5442 } 5443 5444 /** 5445 * @hide 5446 */ 5447 @Override 5448 public boolean resolveLayoutDirection() { 5449 final boolean result = super.resolveLayoutDirection(); 5450 if (result) { 5451 int count = getChildCount(); 5452 for (int i = 0; i < count; i++) { 5453 final View child = getChildAt(i); 5454 if (child.isLayoutDirectionInherited()) { 5455 child.resolveLayoutDirection(); 5456 } 5457 } 5458 } 5459 return result; 5460 } 5461 5462 /** 5463 * @hide 5464 */ 5465 @Override 5466 public boolean resolveTextDirection() { 5467 final boolean result = super.resolveTextDirection(); 5468 if (result) { 5469 int count = getChildCount(); 5470 for (int i = 0; i < count; i++) { 5471 final View child = getChildAt(i); 5472 if (child.isTextDirectionInherited()) { 5473 child.resolveTextDirection(); 5474 } 5475 } 5476 } 5477 return result; 5478 } 5479 5480 /** 5481 * @hide 5482 */ 5483 @Override 5484 public boolean resolveTextAlignment() { 5485 final boolean result = super.resolveTextAlignment(); 5486 if (result) { 5487 int count = getChildCount(); 5488 for (int i = 0; i < count; i++) { 5489 final View child = getChildAt(i); 5490 if (child.isTextAlignmentInherited()) { 5491 child.resolveTextAlignment(); 5492 } 5493 } 5494 } 5495 return result; 5496 } 5497 5498 /** 5499 * @hide 5500 */ 5501 @Override 5502 public void resolvePadding() { 5503 super.resolvePadding(); 5504 int count = getChildCount(); 5505 for (int i = 0; i < count; i++) { 5506 final View child = getChildAt(i); 5507 if (child.isLayoutDirectionInherited()) { 5508 child.resolvePadding(); 5509 } 5510 } 5511 } 5512 5513 /** 5514 * @hide 5515 */ 5516 @Override 5517 protected void resolveDrawables() { 5518 super.resolveDrawables(); 5519 int count = getChildCount(); 5520 for (int i = 0; i < count; i++) { 5521 final View child = getChildAt(i); 5522 if (child.isLayoutDirectionInherited()) { 5523 child.resolveDrawables(); 5524 } 5525 } 5526 } 5527 5528 /** 5529 * @hide 5530 */ 5531 @Override 5532 public void resolveLayoutParams() { 5533 super.resolveLayoutParams(); 5534 int count = getChildCount(); 5535 for (int i = 0; i < count; i++) { 5536 final View child = getChildAt(i); 5537 child.resolveLayoutParams(); 5538 } 5539 } 5540 5541 /** 5542 * @hide 5543 */ 5544 @Override 5545 public void resetResolvedLayoutDirection() { 5546 super.resetResolvedLayoutDirection(); 5547 5548 int count = getChildCount(); 5549 for (int i = 0; i < count; i++) { 5550 final View child = getChildAt(i); 5551 if (child.isLayoutDirectionInherited()) { 5552 child.resetResolvedLayoutDirection(); 5553 } 5554 } 5555 } 5556 5557 /** 5558 * @hide 5559 */ 5560 @Override 5561 public void resetResolvedTextDirection() { 5562 super.resetResolvedTextDirection(); 5563 5564 int count = getChildCount(); 5565 for (int i = 0; i < count; i++) { 5566 final View child = getChildAt(i); 5567 if (child.isTextDirectionInherited()) { 5568 child.resetResolvedTextDirection(); 5569 } 5570 } 5571 } 5572 5573 /** 5574 * @hide 5575 */ 5576 @Override 5577 public void resetResolvedTextAlignment() { 5578 super.resetResolvedTextAlignment(); 5579 5580 int count = getChildCount(); 5581 for (int i = 0; i < count; i++) { 5582 final View child = getChildAt(i); 5583 if (child.isTextAlignmentInherited()) { 5584 child.resetResolvedTextAlignment(); 5585 } 5586 } 5587 } 5588 5589 /** 5590 * @hide 5591 */ 5592 @Override 5593 public void resetResolvedPadding() { 5594 super.resetResolvedPadding(); 5595 5596 int count = getChildCount(); 5597 for (int i = 0; i < count; i++) { 5598 final View child = getChildAt(i); 5599 if (child.isLayoutDirectionInherited()) { 5600 child.resetResolvedPadding(); 5601 } 5602 } 5603 } 5604 5605 /** 5606 * @hide 5607 */ 5608 @Override 5609 protected void resetResolvedDrawables() { 5610 super.resetResolvedDrawables(); 5611 5612 int count = getChildCount(); 5613 for (int i = 0; i < count; i++) { 5614 final View child = getChildAt(i); 5615 if (child.isLayoutDirectionInherited()) { 5616 child.resetResolvedDrawables(); 5617 } 5618 } 5619 } 5620 5621 /** 5622 * Return true if the pressed state should be delayed for children or descendants of this 5623 * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. 5624 * This prevents the pressed state from appearing when the user is actually trying to scroll 5625 * the content. 5626 * 5627 * The default implementation returns true for compatibility reasons. Subclasses that do 5628 * not scroll should generally override this method and return false. 5629 */ 5630 public boolean shouldDelayChildPressedState() { 5631 return true; 5632 } 5633 5634 /** @hide */ 5635 protected void onSetLayoutParams(View child, LayoutParams layoutParams) { 5636 } 5637 5638 /** 5639 * LayoutParams are used by views to tell their parents how they want to be 5640 * laid out. See 5641 * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} 5642 * for a list of all child view attributes that this class supports. 5643 * 5644 * <p> 5645 * The base LayoutParams class just describes how big the view wants to be 5646 * for both width and height. For each dimension, it can specify one of: 5647 * <ul> 5648 * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which 5649 * means that the view wants to be as big as its parent (minus padding) 5650 * <li> WRAP_CONTENT, which means that the view wants to be just big enough 5651 * to enclose its content (plus padding) 5652 * <li> an exact number 5653 * </ul> 5654 * There are subclasses of LayoutParams for different subclasses of 5655 * ViewGroup. For example, AbsoluteLayout has its own subclass of 5656 * LayoutParams which adds an X and Y value.</p> 5657 * 5658 * <div class="special reference"> 5659 * <h3>Developer Guides</h3> 5660 * <p>For more information about creating user interface layouts, read the 5661 * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer 5662 * guide.</p></div> 5663 * 5664 * @attr ref android.R.styleable#ViewGroup_Layout_layout_height 5665 * @attr ref android.R.styleable#ViewGroup_Layout_layout_width 5666 */ 5667 public static class LayoutParams { 5668 /** 5669 * Special value for the height or width requested by a View. 5670 * FILL_PARENT means that the view wants to be as big as its parent, 5671 * minus the parent's padding, if any. This value is deprecated 5672 * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. 5673 */ 5674 @SuppressWarnings({"UnusedDeclaration"}) 5675 @Deprecated 5676 public static final int FILL_PARENT = -1; 5677 5678 /** 5679 * Special value for the height or width requested by a View. 5680 * MATCH_PARENT means that the view wants to be as big as its parent, 5681 * minus the parent's padding, if any. Introduced in API Level 8. 5682 */ 5683 public static final int MATCH_PARENT = -1; 5684 5685 /** 5686 * Special value for the height or width requested by a View. 5687 * WRAP_CONTENT means that the view wants to be just large enough to fit 5688 * its own internal content, taking its own padding into account. 5689 */ 5690 public static final int WRAP_CONTENT = -2; 5691 5692 /** 5693 * Information about how wide the view wants to be. Can be one of the 5694 * constants FILL_PARENT (replaced by MATCH_PARENT , 5695 * in API Level 8) or WRAP_CONTENT. or an exact size. 5696 */ 5697 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5698 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5699 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5700 }) 5701 public int width; 5702 5703 /** 5704 * Information about how tall the view wants to be. Can be one of the 5705 * constants FILL_PARENT (replaced by MATCH_PARENT , 5706 * in API Level 8) or WRAP_CONTENT. or an exact size. 5707 */ 5708 @ViewDebug.ExportedProperty(category = "layout", mapping = { 5709 @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), 5710 @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") 5711 }) 5712 public int height; 5713 5714 /** 5715 * Used to animate layouts. 5716 */ 5717 public LayoutAnimationController.AnimationParameters layoutAnimationParameters; 5718 5719 /** 5720 * Creates a new set of layout parameters. The values are extracted from 5721 * the supplied attributes set and context. The XML attributes mapped 5722 * to this set of layout parameters are: 5723 * 5724 * <ul> 5725 * <li><code>layout_width</code>: the width, either an exact value, 5726 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5727 * {@link #MATCH_PARENT} in API Level 8)</li> 5728 * <li><code>layout_height</code>: the height, either an exact value, 5729 * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by 5730 * {@link #MATCH_PARENT} in API Level 8)</li> 5731 * </ul> 5732 * 5733 * @param c the application environment 5734 * @param attrs the set of attributes from which to extract the layout 5735 * parameters' values 5736 */ 5737 public LayoutParams(Context c, AttributeSet attrs) { 5738 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); 5739 setBaseAttributes(a, 5740 R.styleable.ViewGroup_Layout_layout_width, 5741 R.styleable.ViewGroup_Layout_layout_height); 5742 a.recycle(); 5743 } 5744 5745 /** 5746 * Creates a new set of layout parameters with the specified width 5747 * and height. 5748 * 5749 * @param width the width, either {@link #WRAP_CONTENT}, 5750 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5751 * API Level 8), or a fixed size in pixels 5752 * @param height the height, either {@link #WRAP_CONTENT}, 5753 * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in 5754 * API Level 8), or a fixed size in pixels 5755 */ 5756 public LayoutParams(int width, int height) { 5757 this.width = width; 5758 this.height = height; 5759 } 5760 5761 /** 5762 * Copy constructor. Clones the width and height values of the source. 5763 * 5764 * @param source The layout params to copy from. 5765 */ 5766 public LayoutParams(LayoutParams source) { 5767 this.width = source.width; 5768 this.height = source.height; 5769 } 5770 5771 /** 5772 * Used internally by MarginLayoutParams. 5773 * @hide 5774 */ 5775 LayoutParams() { 5776 } 5777 5778 /** 5779 * Extracts the layout parameters from the supplied attributes. 5780 * 5781 * @param a the style attributes to extract the parameters from 5782 * @param widthAttr the identifier of the width attribute 5783 * @param heightAttr the identifier of the height attribute 5784 */ 5785 protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { 5786 width = a.getLayoutDimension(widthAttr, "layout_width"); 5787 height = a.getLayoutDimension(heightAttr, "layout_height"); 5788 } 5789 5790 /** 5791 * Resolve layout parameters depending on the layout direction. Subclasses that care about 5792 * layoutDirection changes should override this method. The default implementation does 5793 * nothing. 5794 * 5795 * @param layoutDirection the direction of the layout 5796 * 5797 * {@link View#LAYOUT_DIRECTION_LTR} 5798 * {@link View#LAYOUT_DIRECTION_RTL} 5799 */ 5800 public void resolveLayoutDirection(int layoutDirection) { 5801 } 5802 5803 /** 5804 * Returns a String representation of this set of layout parameters. 5805 * 5806 * @param output the String to prepend to the internal representation 5807 * @return a String with the following format: output + 5808 * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" 5809 * 5810 * @hide 5811 */ 5812 public String debug(String output) { 5813 return output + "ViewGroup.LayoutParams={ width=" 5814 + sizeToString(width) + ", height=" + sizeToString(height) + " }"; 5815 } 5816 5817 /** 5818 * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters. 5819 * 5820 * @param view the view that contains these layout parameters 5821 * @param canvas the canvas on which to draw 5822 * 5823 * @hide 5824 */ 5825 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 5826 } 5827 5828 /** 5829 * Converts the specified size to a readable String. 5830 * 5831 * @param size the size to convert 5832 * @return a String instance representing the supplied size 5833 * 5834 * @hide 5835 */ 5836 protected static String sizeToString(int size) { 5837 if (size == WRAP_CONTENT) { 5838 return "wrap-content"; 5839 } 5840 if (size == MATCH_PARENT) { 5841 return "match-parent"; 5842 } 5843 return String.valueOf(size); 5844 } 5845 } 5846 5847 /** 5848 * Per-child layout information for layouts that support margins. 5849 * See 5850 * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} 5851 * for a list of all child view attributes that this class supports. 5852 */ 5853 public static class MarginLayoutParams extends ViewGroup.LayoutParams { 5854 /** 5855 * The left margin in pixels of the child. 5856 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5857 * to this field. 5858 */ 5859 @ViewDebug.ExportedProperty(category = "layout") 5860 public int leftMargin; 5861 5862 /** 5863 * The top margin in pixels of the child. 5864 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5865 * to this field. 5866 */ 5867 @ViewDebug.ExportedProperty(category = "layout") 5868 public int topMargin; 5869 5870 /** 5871 * The right margin in pixels of the child. 5872 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5873 * to this field. 5874 */ 5875 @ViewDebug.ExportedProperty(category = "layout") 5876 public int rightMargin; 5877 5878 /** 5879 * The bottom margin in pixels of the child. 5880 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5881 * to this field. 5882 */ 5883 @ViewDebug.ExportedProperty(category = "layout") 5884 public int bottomMargin; 5885 5886 /** 5887 * The start margin in pixels of the child. 5888 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5889 * to this field. 5890 */ 5891 @ViewDebug.ExportedProperty(category = "layout") 5892 private int startMargin = DEFAULT_RELATIVE; 5893 5894 /** 5895 * The end margin in pixels of the child. 5896 * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value 5897 * to this field. 5898 */ 5899 @ViewDebug.ExportedProperty(category = "layout") 5900 private int endMargin = DEFAULT_RELATIVE; 5901 5902 /** 5903 * The default start and end margin. 5904 * @hide 5905 */ 5906 public static final int DEFAULT_RELATIVE = Integer.MIN_VALUE; 5907 5908 private int initialLeftMargin; 5909 private int initialRightMargin; 5910 5911 private static int LAYOUT_DIRECTION_UNDEFINED = -1; 5912 5913 // Layout direction undefined by default 5914 private int layoutDirection = LAYOUT_DIRECTION_UNDEFINED; 5915 5916 /** 5917 * Creates a new set of layout parameters. The values are extracted from 5918 * the supplied attributes set and context. 5919 * 5920 * @param c the application environment 5921 * @param attrs the set of attributes from which to extract the layout 5922 * parameters' values 5923 */ 5924 public MarginLayoutParams(Context c, AttributeSet attrs) { 5925 super(); 5926 5927 TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); 5928 setBaseAttributes(a, 5929 R.styleable.ViewGroup_MarginLayout_layout_width, 5930 R.styleable.ViewGroup_MarginLayout_layout_height); 5931 5932 int margin = a.getDimensionPixelSize( 5933 com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); 5934 if (margin >= 0) { 5935 leftMargin = margin; 5936 topMargin = margin; 5937 rightMargin= margin; 5938 bottomMargin = margin; 5939 } else { 5940 leftMargin = a.getDimensionPixelSize( 5941 R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); 5942 topMargin = a.getDimensionPixelSize( 5943 R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); 5944 rightMargin = a.getDimensionPixelSize( 5945 R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); 5946 bottomMargin = a.getDimensionPixelSize( 5947 R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); 5948 startMargin = a.getDimensionPixelSize( 5949 R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); 5950 endMargin = a.getDimensionPixelSize( 5951 R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); 5952 } 5953 5954 initialLeftMargin = leftMargin; 5955 initialRightMargin = rightMargin; 5956 5957 a.recycle(); 5958 } 5959 5960 /** 5961 * {@inheritDoc} 5962 */ 5963 public MarginLayoutParams(int width, int height) { 5964 super(width, height); 5965 } 5966 5967 /** 5968 * Copy constructor. Clones the width, height and margin values of the source. 5969 * 5970 * @param source The layout params to copy from. 5971 */ 5972 public MarginLayoutParams(MarginLayoutParams source) { 5973 this.width = source.width; 5974 this.height = source.height; 5975 5976 this.leftMargin = source.leftMargin; 5977 this.topMargin = source.topMargin; 5978 this.rightMargin = source.rightMargin; 5979 this.bottomMargin = source.bottomMargin; 5980 this.startMargin = source.startMargin; 5981 this.endMargin = source.endMargin; 5982 5983 this.initialLeftMargin = source.leftMargin; 5984 this.initialRightMargin = source.rightMargin; 5985 5986 setLayoutDirection(source.layoutDirection); 5987 } 5988 5989 /** 5990 * {@inheritDoc} 5991 */ 5992 public MarginLayoutParams(LayoutParams source) { 5993 super(source); 5994 } 5995 5996 /** 5997 * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs 5998 * to be done so that the new margins are taken into account. Left and right margins may be 5999 * overriden by {@link android.view.View#requestLayout()} depending on layout direction. 6000 * 6001 * @param left the left margin size 6002 * @param top the top margin size 6003 * @param right the right margin size 6004 * @param bottom the bottom margin size 6005 * 6006 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft 6007 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6008 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight 6009 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6010 */ 6011 public void setMargins(int left, int top, int right, int bottom) { 6012 leftMargin = left; 6013 topMargin = top; 6014 rightMargin = right; 6015 bottomMargin = bottom; 6016 initialLeftMargin = left; 6017 initialRightMargin = right; 6018 } 6019 6020 /** 6021 * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} 6022 * needs to be done so that the new relative margins are taken into account. Left and right 6023 * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout 6024 * direction. 6025 * 6026 * @param start the start margin size 6027 * @param top the top margin size 6028 * @param end the right margin size 6029 * @param bottom the bottom margin size 6030 * 6031 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6032 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop 6033 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6034 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom 6035 * 6036 * @hide 6037 */ 6038 public void setMarginsRelative(int start, int top, int end, int bottom) { 6039 startMargin = start; 6040 topMargin = top; 6041 endMargin = end; 6042 bottomMargin = bottom; 6043 initialLeftMargin = 0; 6044 initialRightMargin = 0; 6045 } 6046 6047 /** 6048 * Sets the relative start margin. 6049 * 6050 * @param start the start margin size 6051 * 6052 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6053 */ 6054 public void setMarginStart(int start) { 6055 startMargin = start; 6056 } 6057 6058 /** 6059 * Returns the start margin in pixels. 6060 * 6061 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6062 * 6063 * @return the start margin in pixels. 6064 */ 6065 public int getMarginStart() { 6066 if (startMargin != DEFAULT_RELATIVE) return startMargin; 6067 switch(layoutDirection) { 6068 case View.LAYOUT_DIRECTION_RTL: 6069 return rightMargin; 6070 case View.LAYOUT_DIRECTION_LTR: 6071 default: 6072 return leftMargin; 6073 } 6074 } 6075 6076 /** 6077 * Sets the relative end margin. 6078 * 6079 * @param end the end margin size 6080 * 6081 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6082 */ 6083 public void setMarginEnd(int end) { 6084 endMargin = end; 6085 } 6086 6087 /** 6088 * Returns the end margin in pixels. 6089 * 6090 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6091 * 6092 * @return the end margin in pixels. 6093 */ 6094 public int getMarginEnd() { 6095 if (endMargin != DEFAULT_RELATIVE) return endMargin; 6096 switch(layoutDirection) { 6097 case View.LAYOUT_DIRECTION_RTL: 6098 return leftMargin; 6099 case View.LAYOUT_DIRECTION_LTR: 6100 default: 6101 return rightMargin; 6102 } 6103 } 6104 6105 /** 6106 * Check if margins are relative. 6107 * 6108 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart 6109 * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd 6110 * 6111 * @return true if either marginStart or marginEnd has been set. 6112 */ 6113 public boolean isMarginRelative() { 6114 return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); 6115 } 6116 6117 /** 6118 * Set the layout direction 6119 * @param layoutDirection the layout direction. 6120 * Should be either {@link View#LAYOUT_DIRECTION_LTR} 6121 * or {@link View#LAYOUT_DIRECTION_RTL}. 6122 */ 6123 public void setLayoutDirection(int layoutDirection) { 6124 if (layoutDirection != View.LAYOUT_DIRECTION_LTR && 6125 layoutDirection != View.LAYOUT_DIRECTION_RTL) return; 6126 this.layoutDirection = layoutDirection; 6127 } 6128 6129 /** 6130 * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or 6131 * {@link View#LAYOUT_DIRECTION_RTL}. 6132 * 6133 * @return the layout direction. 6134 */ 6135 public int getLayoutDirection() { 6136 return layoutDirection; 6137 } 6138 6139 /** 6140 * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins 6141 * may be overridden depending on layout direction. 6142 */ 6143 @Override 6144 public void resolveLayoutDirection(int layoutDirection) { 6145 setLayoutDirection(layoutDirection); 6146 6147 if (!isMarginRelative()) return; 6148 6149 switch(layoutDirection) { 6150 case View.LAYOUT_DIRECTION_RTL: 6151 leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : initialLeftMargin; 6152 rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : initialRightMargin; 6153 break; 6154 case View.LAYOUT_DIRECTION_LTR: 6155 default: 6156 leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : initialLeftMargin; 6157 rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : initialRightMargin; 6158 break; 6159 } 6160 } 6161 6162 /** 6163 * @hide 6164 */ 6165 public boolean isLayoutRtl() { 6166 return (layoutDirection == View.LAYOUT_DIRECTION_RTL); 6167 } 6168 6169 /** 6170 * @hide 6171 */ 6172 @Override 6173 public void onDebugDraw(View view, Canvas canvas, Paint paint) { 6174 Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE; 6175 6176 fillDifference(canvas, 6177 view.getLeft() + oi.left, 6178 view.getTop() + oi.top, 6179 view.getRight() - oi.right, 6180 view.getBottom() - oi.bottom, 6181 leftMargin, 6182 topMargin, 6183 rightMargin, 6184 bottomMargin, 6185 paint); 6186 } 6187 } 6188 6189 /* Describes a touched view and the ids of the pointers that it has captured. 6190 * 6191 * This code assumes that pointer ids are always in the range 0..31 such that 6192 * it can use a bitfield to track which pointer ids are present. 6193 * As it happens, the lower layers of the input dispatch pipeline also use the 6194 * same trick so the assumption should be safe here... 6195 */ 6196 private static final class TouchTarget { 6197 private static final int MAX_RECYCLED = 32; 6198 private static final Object sRecycleLock = new Object(); 6199 private static TouchTarget sRecycleBin; 6200 private static int sRecycledCount; 6201 6202 public static final int ALL_POINTER_IDS = -1; // all ones 6203 6204 // The touched child view. 6205 public View child; 6206 6207 // The combined bit mask of pointer ids for all pointers captured by the target. 6208 public int pointerIdBits; 6209 6210 // The next target in the target list. 6211 public TouchTarget next; 6212 6213 private TouchTarget() { 6214 } 6215 6216 public static TouchTarget obtain(View child, int pointerIdBits) { 6217 final TouchTarget target; 6218 synchronized (sRecycleLock) { 6219 if (sRecycleBin == null) { 6220 target = new TouchTarget(); 6221 } else { 6222 target = sRecycleBin; 6223 sRecycleBin = target.next; 6224 sRecycledCount--; 6225 target.next = null; 6226 } 6227 } 6228 target.child = child; 6229 target.pointerIdBits = pointerIdBits; 6230 return target; 6231 } 6232 6233 public void recycle() { 6234 synchronized (sRecycleLock) { 6235 if (sRecycledCount < MAX_RECYCLED) { 6236 next = sRecycleBin; 6237 sRecycleBin = this; 6238 sRecycledCount += 1; 6239 } else { 6240 next = null; 6241 } 6242 child = null; 6243 } 6244 } 6245 } 6246 6247 /* Describes a hovered view. */ 6248 private static final class HoverTarget { 6249 private static final int MAX_RECYCLED = 32; 6250 private static final Object sRecycleLock = new Object(); 6251 private static HoverTarget sRecycleBin; 6252 private static int sRecycledCount; 6253 6254 // The hovered child view. 6255 public View child; 6256 6257 // The next target in the target list. 6258 public HoverTarget next; 6259 6260 private HoverTarget() { 6261 } 6262 6263 public static HoverTarget obtain(View child) { 6264 final HoverTarget target; 6265 synchronized (sRecycleLock) { 6266 if (sRecycleBin == null) { 6267 target = new HoverTarget(); 6268 } else { 6269 target = sRecycleBin; 6270 sRecycleBin = target.next; 6271 sRecycledCount--; 6272 target.next = null; 6273 } 6274 } 6275 target.child = child; 6276 return target; 6277 } 6278 6279 public void recycle() { 6280 synchronized (sRecycleLock) { 6281 if (sRecycledCount < MAX_RECYCLED) { 6282 next = sRecycleBin; 6283 sRecycleBin = this; 6284 sRecycledCount += 1; 6285 } else { 6286 next = null; 6287 } 6288 child = null; 6289 } 6290 } 6291 } 6292 6293 /** 6294 * Pooled class that orderes the children of a ViewGroup from start 6295 * to end based on how they are laid out and the layout direction. 6296 */ 6297 static class ChildListForAccessibility { 6298 6299 private static final int MAX_POOL_SIZE = 32; 6300 6301 private static final SynchronizedPool<ChildListForAccessibility> sPool = 6302 new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE); 6303 6304 private final ArrayList<View> mChildren = new ArrayList<View>(); 6305 6306 private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>(); 6307 6308 public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) { 6309 ChildListForAccessibility list = sPool.acquire(); 6310 if (list == null) { 6311 list = new ChildListForAccessibility(); 6312 } 6313 list.init(parent, sort); 6314 return list; 6315 } 6316 6317 public void recycle() { 6318 clear(); 6319 sPool.release(this); 6320 } 6321 6322 public int getChildCount() { 6323 return mChildren.size(); 6324 } 6325 6326 public View getChildAt(int index) { 6327 return mChildren.get(index); 6328 } 6329 6330 public int getChildIndex(View child) { 6331 return mChildren.indexOf(child); 6332 } 6333 6334 private void init(ViewGroup parent, boolean sort) { 6335 ArrayList<View> children = mChildren; 6336 final int childCount = parent.getChildCount(); 6337 for (int i = 0; i < childCount; i++) { 6338 View child = parent.getChildAt(i); 6339 children.add(child); 6340 } 6341 if (sort) { 6342 ArrayList<ViewLocationHolder> holders = mHolders; 6343 for (int i = 0; i < childCount; i++) { 6344 View child = children.get(i); 6345 ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child); 6346 holders.add(holder); 6347 } 6348 Collections.sort(holders); 6349 for (int i = 0; i < childCount; i++) { 6350 ViewLocationHolder holder = holders.get(i); 6351 children.set(i, holder.mView); 6352 holder.recycle(); 6353 } 6354 holders.clear(); 6355 } 6356 } 6357 6358 private void clear() { 6359 mChildren.clear(); 6360 } 6361 } 6362 6363 /** 6364 * Pooled class that holds a View and its location with respect to 6365 * a specified root. This enables sorting of views based on their 6366 * coordinates without recomputing the position relative to the root 6367 * on every comparison. 6368 */ 6369 static class ViewLocationHolder implements Comparable<ViewLocationHolder> { 6370 6371 private static final int MAX_POOL_SIZE = 32; 6372 6373 private static final SynchronizedPool<ViewLocationHolder> sPool = 6374 new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE); 6375 6376 private final Rect mLocation = new Rect(); 6377 6378 public View mView; 6379 6380 private int mLayoutDirection; 6381 6382 public static ViewLocationHolder obtain(ViewGroup root, View view) { 6383 ViewLocationHolder holder = sPool.acquire(); 6384 if (holder == null) { 6385 holder = new ViewLocationHolder(); 6386 } 6387 holder.init(root, view); 6388 return holder; 6389 } 6390 6391 public void recycle() { 6392 clear(); 6393 sPool.release(this); 6394 } 6395 6396 @Override 6397 public int compareTo(ViewLocationHolder another) { 6398 // This instance is greater than an invalid argument. 6399 if (another == null) { 6400 return 1; 6401 } 6402 if (getClass() != another.getClass()) { 6403 return 1; 6404 } 6405 // First is above second. 6406 if (mLocation.bottom - another.mLocation.top <= 0) { 6407 return -1; 6408 } 6409 // First is below second. 6410 if (mLocation.top - another.mLocation.bottom >= 0) { 6411 return 1; 6412 } 6413 // LTR 6414 if (mLayoutDirection == LAYOUT_DIRECTION_LTR) { 6415 final int leftDifference = mLocation.left - another.mLocation.left; 6416 // First more to the left than second. 6417 if (leftDifference != 0) { 6418 return leftDifference; 6419 } 6420 } else { // RTL 6421 final int rightDifference = mLocation.right - another.mLocation.right; 6422 // First more to the right than second. 6423 if (rightDifference != 0) { 6424 return -rightDifference; 6425 } 6426 } 6427 // Break tie by top. 6428 final int topDiference = mLocation.top - another.mLocation.top; 6429 if (topDiference != 0) { 6430 return topDiference; 6431 } 6432 // Break tie by height. 6433 final int heightDiference = mLocation.height() - another.mLocation.height(); 6434 if (heightDiference != 0) { 6435 return -heightDiference; 6436 } 6437 // Break tie by width. 6438 final int widthDiference = mLocation.width() - another.mLocation.width(); 6439 if (widthDiference != 0) { 6440 return -widthDiference; 6441 } 6442 // Just break the tie somehow. The accessibliity ids are unique 6443 // and stable, hence this is deterministic tie breaking. 6444 return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); 6445 } 6446 6447 private void init(ViewGroup root, View view) { 6448 Rect viewLocation = mLocation; 6449 view.getDrawingRect(viewLocation); 6450 root.offsetDescendantRectToMyCoords(view, viewLocation); 6451 mView = view; 6452 mLayoutDirection = root.getLayoutDirection(); 6453 } 6454 6455 private void clear() { 6456 mView = null; 6457 mLocation.set(0, 0, 0, 0); 6458 } 6459 } 6460 6461 private static Paint getDebugPaint() { 6462 if (sDebugPaint == null) { 6463 sDebugPaint = new Paint(); 6464 sDebugPaint.setAntiAlias(false); 6465 } 6466 return sDebugPaint; 6467 } 6468 6469 private void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) { 6470 if (sDebugLines== null) { 6471 sDebugLines = new float[16]; 6472 } 6473 6474 sDebugLines[0] = x1; 6475 sDebugLines[1] = y1; 6476 sDebugLines[2] = x2; 6477 sDebugLines[3] = y1; 6478 6479 sDebugLines[4] = x2; 6480 sDebugLines[5] = y1; 6481 sDebugLines[6] = x2; 6482 sDebugLines[7] = y2; 6483 6484 sDebugLines[8] = x2; 6485 sDebugLines[9] = y2; 6486 sDebugLines[10] = x1; 6487 sDebugLines[11] = y2; 6488 6489 sDebugLines[12] = x1; 6490 sDebugLines[13] = y2; 6491 sDebugLines[14] = x1; 6492 sDebugLines[15] = y1; 6493 6494 canvas.drawLines(sDebugLines, paint); 6495 } 6496} 6497