| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.view; |
| |
| import android.animation.LayoutTransition; |
| import android.content.Context; |
| import android.content.res.Configuration; |
| import android.content.res.TypedArray; |
| import android.graphics.Bitmap; |
| import android.graphics.Canvas; |
| import android.graphics.Matrix; |
| import android.graphics.Paint; |
| import android.graphics.PointF; |
| import android.graphics.Rect; |
| import android.graphics.RectF; |
| import android.graphics.Region; |
| import android.os.Build; |
| import android.os.Parcelable; |
| import android.os.SystemClock; |
| import android.util.AttributeSet; |
| import android.util.Log; |
| import android.util.SparseArray; |
| import android.view.accessibility.AccessibilityEvent; |
| import android.view.accessibility.AccessibilityNodeInfo; |
| import android.view.animation.Animation; |
| import android.view.animation.AnimationUtils; |
| import android.view.animation.LayoutAnimationController; |
| import android.view.animation.Transformation; |
| |
| import com.android.internal.R; |
| import com.android.internal.util.Predicate; |
| |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| |
| /** |
| * <p> |
| * A <code>ViewGroup</code> is a special view that can contain other views |
| * (called children.) The view group is the base class for layouts and views |
| * containers. This class also defines the |
| * {@link android.view.ViewGroup.LayoutParams} class which serves as the base |
| * class for layouts parameters. |
| * </p> |
| * |
| * <p> |
| * Also see {@link LayoutParams} for layout attributes. |
| * </p> |
| * |
| * <div class="special reference"> |
| * <h3>Developer Guides</h3> |
| * <p>For more information about creating user interface layouts, read the |
| * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer |
| * guide.</p></div> |
| * |
| * @attr ref android.R.styleable#ViewGroup_clipChildren |
| * @attr ref android.R.styleable#ViewGroup_clipToPadding |
| * @attr ref android.R.styleable#ViewGroup_layoutAnimation |
| * @attr ref android.R.styleable#ViewGroup_animationCache |
| * @attr ref android.R.styleable#ViewGroup_persistentDrawingCache |
| * @attr ref android.R.styleable#ViewGroup_alwaysDrawnWithCache |
| * @attr ref android.R.styleable#ViewGroup_addStatesFromChildren |
| * @attr ref android.R.styleable#ViewGroup_descendantFocusability |
| * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges |
| */ |
| public abstract class ViewGroup extends View implements ViewParent, ViewManager { |
| private static final String TAG = "ViewGroup"; |
| |
| private static final boolean DBG = false; |
| |
| /** |
| * Views which have been hidden or removed which need to be animated on |
| * their way out. |
| * This field should be made private, so it is hidden from the SDK. |
| * {@hide} |
| */ |
| protected ArrayList<View> mDisappearingChildren; |
| |
| /** |
| * Listener used to propagate events indicating when children are added |
| * and/or removed from a view group. |
| * This field should be made private, so it is hidden from the SDK. |
| * {@hide} |
| */ |
| protected OnHierarchyChangeListener mOnHierarchyChangeListener; |
| |
| // The view contained within this ViewGroup that has or contains focus. |
| private View mFocused; |
| |
| /** |
| * A Transformation used when drawing children, to |
| * apply on the child being drawn. |
| */ |
| final Transformation mChildTransformation = new Transformation(); |
| |
| /** |
| * Used to track the current invalidation region. |
| */ |
| RectF mInvalidateRegion; |
| |
| /** |
| * A Transformation used to calculate a correct |
| * invalidation area when the application is autoscaled. |
| */ |
| Transformation mInvalidationTransformation; |
| |
| // View currently under an ongoing drag |
| private View mCurrentDragView; |
| |
| // Metadata about the ongoing drag |
| private DragEvent mCurrentDrag; |
| private HashSet<View> mDragNotifiedChildren; |
| |
| // Does this group have a child that can accept the current drag payload? |
| private boolean mChildAcceptsDrag; |
| |
| // Used during drag dispatch |
| private final PointF mLocalPoint = new PointF(); |
| |
| // Layout animation |
| private LayoutAnimationController mLayoutAnimationController; |
| private Animation.AnimationListener mAnimationListener; |
| |
| // First touch target in the linked list of touch targets. |
| private TouchTarget mFirstTouchTarget; |
| |
| // For debugging only. You can see these in hierarchyviewer. |
| @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) |
| @ViewDebug.ExportedProperty(category = "events") |
| private long mLastTouchDownTime; |
| @ViewDebug.ExportedProperty(category = "events") |
| private int mLastTouchDownIndex = -1; |
| @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) |
| @ViewDebug.ExportedProperty(category = "events") |
| private float mLastTouchDownX; |
| @SuppressWarnings({"FieldCanBeLocal", "UnusedDeclaration"}) |
| @ViewDebug.ExportedProperty(category = "events") |
| private float mLastTouchDownY; |
| |
| // First hover target in the linked list of hover targets. |
| // The hover targets are children which have received ACTION_HOVER_ENTER. |
| // They might not have actually handled the hover event, but we will |
| // continue sending hover events to them as long as the pointer remains over |
| // their bounds and the view group does not intercept hover. |
| private HoverTarget mFirstHoverTarget; |
| |
| // True if the view group itself received a hover event. |
| // It might not have actually handled the hover event. |
| private boolean mHoveredSelf; |
| |
| /** |
| * Internal flags. |
| * |
| * This field should be made private, so it is hidden from the SDK. |
| * {@hide} |
| */ |
| protected int mGroupFlags; |
| |
| /** |
| * NOTE: If you change the flags below make sure to reflect the changes |
| * the DisplayList class |
| */ |
| |
| // When set, ViewGroup invalidates only the child's rectangle |
| // Set by default |
| static final int FLAG_CLIP_CHILDREN = 0x1; |
| |
| // When set, ViewGroup excludes the padding area from the invalidate rectangle |
| // Set by default |
| private static final int FLAG_CLIP_TO_PADDING = 0x2; |
| |
| // When set, dispatchDraw() will invoke invalidate(); this is set by drawChild() when |
| // a child needs to be invalidated and FLAG_OPTIMIZE_INVALIDATE is set |
| static final int FLAG_INVALIDATE_REQUIRED = 0x4; |
| |
| // When set, dispatchDraw() will run the layout animation and unset the flag |
| private static final int FLAG_RUN_ANIMATION = 0x8; |
| |
| // When set, there is either no layout animation on the ViewGroup or the layout |
| // animation is over |
| // Set by default |
| static final int FLAG_ANIMATION_DONE = 0x10; |
| |
| // If set, this ViewGroup has padding; if unset there is no padding and we don't need |
| // to clip it, even if FLAG_CLIP_TO_PADDING is set |
| private static final int FLAG_PADDING_NOT_NULL = 0x20; |
| |
| // When set, this ViewGroup caches its children in a Bitmap before starting a layout animation |
| // Set by default |
| private static final int FLAG_ANIMATION_CACHE = 0x40; |
| |
| // When set, this ViewGroup converts calls to invalidate(Rect) to invalidate() during a |
| // layout animation; this avoid clobbering the hierarchy |
| // Automatically set when the layout animation starts, depending on the animation's |
| // characteristics |
| static final int FLAG_OPTIMIZE_INVALIDATE = 0x80; |
| |
| // When set, the next call to drawChild() will clear mChildTransformation's matrix |
| static final int FLAG_CLEAR_TRANSFORMATION = 0x100; |
| |
| // When set, this ViewGroup invokes mAnimationListener.onAnimationEnd() and removes |
| // the children's Bitmap caches if necessary |
| // This flag is set when the layout animation is over (after FLAG_ANIMATION_DONE is set) |
| private static final int FLAG_NOTIFY_ANIMATION_LISTENER = 0x200; |
| |
| /** |
| * When set, the drawing method will call {@link #getChildDrawingOrder(int, int)} |
| * to get the index of the child to draw for that iteration. |
| * |
| * @hide |
| */ |
| protected static final int FLAG_USE_CHILD_DRAWING_ORDER = 0x400; |
| |
| /** |
| * When set, this ViewGroup supports static transformations on children; this causes |
| * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be |
| * invoked when a child is drawn. |
| * |
| * Any subclass overriding |
| * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should |
| * set this flags in {@link #mGroupFlags}. |
| * |
| * {@hide} |
| */ |
| protected static final int FLAG_SUPPORT_STATIC_TRANSFORMATIONS = 0x800; |
| |
| // When the previous drawChild() invocation used an alpha value that was lower than |
| // 1.0 and set it in mCachePaint |
| static final int FLAG_ALPHA_LOWER_THAN_ONE = 0x1000; |
| |
| /** |
| * When set, this ViewGroup's drawable states also include those |
| * of its children. |
| */ |
| private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000; |
| |
| /** |
| * When set, this ViewGroup tries to always draw its children using their drawing cache. |
| */ |
| static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000; |
| |
| /** |
| * When set, and if FLAG_ALWAYS_DRAWN_WITH_CACHE is not set, this ViewGroup will try to |
| * draw its children with their drawing cache. |
| */ |
| static final int FLAG_CHILDREN_DRAWN_WITH_CACHE = 0x8000; |
| |
| /** |
| * When set, this group will go through its list of children to notify them of |
| * any drawable state change. |
| */ |
| private static final int FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE = 0x10000; |
| |
| private static final int FLAG_MASK_FOCUSABILITY = 0x60000; |
| |
| /** |
| * This view will get focus before any of its descendants. |
| */ |
| public static final int FOCUS_BEFORE_DESCENDANTS = 0x20000; |
| |
| /** |
| * This view will get focus only if none of its descendants want it. |
| */ |
| public static final int FOCUS_AFTER_DESCENDANTS = 0x40000; |
| |
| /** |
| * This view will block any of its descendants from getting focus, even |
| * if they are focusable. |
| */ |
| public static final int FOCUS_BLOCK_DESCENDANTS = 0x60000; |
| |
| /** |
| * Used to map between enum in attrubutes and flag values. |
| */ |
| private static final int[] DESCENDANT_FOCUSABILITY_FLAGS = |
| {FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, |
| FOCUS_BLOCK_DESCENDANTS}; |
| |
| /** |
| * When set, this ViewGroup should not intercept touch events. |
| * {@hide} |
| */ |
| protected static final int FLAG_DISALLOW_INTERCEPT = 0x80000; |
| |
| /** |
| * When set, this ViewGroup will split MotionEvents to multiple child Views when appropriate. |
| */ |
| private static final int FLAG_SPLIT_MOTION_EVENTS = 0x200000; |
| |
| /** |
| * When set, this ViewGroup will not dispatch onAttachedToWindow calls |
| * to children when adding new views. This is used to prevent multiple |
| * onAttached calls when a ViewGroup adds children in its own onAttached method. |
| */ |
| private static final int FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW = 0x400000; |
| |
| /** |
| * Indicates which types of drawing caches are to be kept in memory. |
| * This field should be made private, so it is hidden from the SDK. |
| * {@hide} |
| */ |
| protected int mPersistentDrawingCache; |
| |
| /** |
| * Used to indicate that no drawing cache should be kept in memory. |
| */ |
| public static final int PERSISTENT_NO_CACHE = 0x0; |
| |
| /** |
| * Used to indicate that the animation drawing cache should be kept in memory. |
| */ |
| public static final int PERSISTENT_ANIMATION_CACHE = 0x1; |
| |
| /** |
| * Used to indicate that the scrolling drawing cache should be kept in memory. |
| */ |
| public static final int PERSISTENT_SCROLLING_CACHE = 0x2; |
| |
| /** |
| * Used to indicate that all drawing caches should be kept in memory. |
| */ |
| public static final int PERSISTENT_ALL_CACHES = 0x3; |
| |
| /** |
| * We clip to padding when FLAG_CLIP_TO_PADDING and FLAG_PADDING_NOT_NULL |
| * are set at the same time. |
| */ |
| protected static final int CLIP_TO_PADDING_MASK = FLAG_CLIP_TO_PADDING | FLAG_PADDING_NOT_NULL; |
| |
| // Index of the child's left position in the mLocation array |
| private static final int CHILD_LEFT_INDEX = 0; |
| // Index of the child's top position in the mLocation array |
| private static final int CHILD_TOP_INDEX = 1; |
| |
| // Child views of this ViewGroup |
| private View[] mChildren; |
| // Number of valid children in the mChildren array, the rest should be null or not |
| // considered as children |
| |
| private boolean mLayoutSuppressed = false; |
| |
| private int mChildrenCount; |
| |
| private static final int ARRAY_INITIAL_CAPACITY = 12; |
| private static final int ARRAY_CAPACITY_INCREMENT = 12; |
| |
| // Used to draw cached views |
| Paint mCachePaint; |
| |
| // Used to animate add/remove changes in layout |
| private LayoutTransition mTransition; |
| |
| // The set of views that are currently being transitioned. This list is used to track views |
| // being removed that should not actually be removed from the parent yet because they are |
| // being animated. |
| private ArrayList<View> mTransitioningViews; |
| |
| // List of children changing visibility. This is used to potentially keep rendering |
| // views during a transition when they otherwise would have become gone/invisible |
| private ArrayList<View> mVisibilityChangingChildren; |
| |
| // Indicates whether this container will use its children layers to draw |
| @ViewDebug.ExportedProperty(category = "drawing") |
| boolean mDrawLayers = true; |
| |
| // Indicates how many of this container's child subtrees contain transient state |
| @ViewDebug.ExportedProperty(category = "layout") |
| private int mChildCountWithTransientState = 0; |
| |
| public ViewGroup(Context context) { |
| super(context); |
| initViewGroup(); |
| } |
| |
| public ViewGroup(Context context, AttributeSet attrs) { |
| super(context, attrs); |
| initViewGroup(); |
| initFromAttributes(context, attrs); |
| } |
| |
| public ViewGroup(Context context, AttributeSet attrs, int defStyle) { |
| super(context, attrs, defStyle); |
| initViewGroup(); |
| initFromAttributes(context, attrs); |
| } |
| |
| private void initViewGroup() { |
| // ViewGroup doesn't draw by default |
| setFlags(WILL_NOT_DRAW, DRAW_MASK); |
| mGroupFlags |= FLAG_CLIP_CHILDREN; |
| mGroupFlags |= FLAG_CLIP_TO_PADDING; |
| mGroupFlags |= FLAG_ANIMATION_DONE; |
| mGroupFlags |= FLAG_ANIMATION_CACHE; |
| mGroupFlags |= FLAG_ALWAYS_DRAWN_WITH_CACHE; |
| |
| if (mContext.getApplicationInfo().targetSdkVersion >= Build.VERSION_CODES.HONEYCOMB) { |
| mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; |
| } |
| |
| setDescendantFocusability(FOCUS_BEFORE_DESCENDANTS); |
| |
| mChildren = new View[ARRAY_INITIAL_CAPACITY]; |
| mChildrenCount = 0; |
| |
| mPersistentDrawingCache = PERSISTENT_SCROLLING_CACHE; |
| } |
| |
| private void initFromAttributes(Context context, AttributeSet attrs) { |
| TypedArray a = context.obtainStyledAttributes(attrs, |
| R.styleable.ViewGroup); |
| |
| final int N = a.getIndexCount(); |
| for (int i = 0; i < N; i++) { |
| int attr = a.getIndex(i); |
| switch (attr) { |
| case R.styleable.ViewGroup_clipChildren: |
| setClipChildren(a.getBoolean(attr, true)); |
| break; |
| case R.styleable.ViewGroup_clipToPadding: |
| setClipToPadding(a.getBoolean(attr, true)); |
| break; |
| case R.styleable.ViewGroup_animationCache: |
| setAnimationCacheEnabled(a.getBoolean(attr, true)); |
| break; |
| case R.styleable.ViewGroup_persistentDrawingCache: |
| setPersistentDrawingCache(a.getInt(attr, PERSISTENT_SCROLLING_CACHE)); |
| break; |
| case R.styleable.ViewGroup_addStatesFromChildren: |
| setAddStatesFromChildren(a.getBoolean(attr, false)); |
| break; |
| case R.styleable.ViewGroup_alwaysDrawnWithCache: |
| setAlwaysDrawnWithCacheEnabled(a.getBoolean(attr, true)); |
| break; |
| case R.styleable.ViewGroup_layoutAnimation: |
| int id = a.getResourceId(attr, -1); |
| if (id > 0) { |
| setLayoutAnimation(AnimationUtils.loadLayoutAnimation(mContext, id)); |
| } |
| break; |
| case R.styleable.ViewGroup_descendantFocusability: |
| setDescendantFocusability(DESCENDANT_FOCUSABILITY_FLAGS[a.getInt(attr, 0)]); |
| break; |
| case R.styleable.ViewGroup_splitMotionEvents: |
| setMotionEventSplittingEnabled(a.getBoolean(attr, false)); |
| break; |
| case R.styleable.ViewGroup_animateLayoutChanges: |
| boolean animateLayoutChanges = a.getBoolean(attr, false); |
| if (animateLayoutChanges) { |
| setLayoutTransition(new LayoutTransition()); |
| } |
| break; |
| } |
| } |
| |
| a.recycle(); |
| } |
| |
| /** |
| * Gets the descendant focusability of this view group. The descendant |
| * focusability defines the relationship between this view group and its |
| * descendants when looking for a view to take focus in |
| * {@link #requestFocus(int, android.graphics.Rect)}. |
| * |
| * @return one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, |
| * {@link #FOCUS_BLOCK_DESCENDANTS}. |
| */ |
| @ViewDebug.ExportedProperty(category = "focus", mapping = { |
| @ViewDebug.IntToString(from = FOCUS_BEFORE_DESCENDANTS, to = "FOCUS_BEFORE_DESCENDANTS"), |
| @ViewDebug.IntToString(from = FOCUS_AFTER_DESCENDANTS, to = "FOCUS_AFTER_DESCENDANTS"), |
| @ViewDebug.IntToString(from = FOCUS_BLOCK_DESCENDANTS, to = "FOCUS_BLOCK_DESCENDANTS") |
| }) |
| public int getDescendantFocusability() { |
| return mGroupFlags & FLAG_MASK_FOCUSABILITY; |
| } |
| |
| /** |
| * Set the descendant focusability of this view group. This defines the relationship |
| * between this view group and its descendants when looking for a view to |
| * take focus in {@link #requestFocus(int, android.graphics.Rect)}. |
| * |
| * @param focusability one of {@link #FOCUS_BEFORE_DESCENDANTS}, {@link #FOCUS_AFTER_DESCENDANTS}, |
| * {@link #FOCUS_BLOCK_DESCENDANTS}. |
| */ |
| public void setDescendantFocusability(int focusability) { |
| switch (focusability) { |
| case FOCUS_BEFORE_DESCENDANTS: |
| case FOCUS_AFTER_DESCENDANTS: |
| case FOCUS_BLOCK_DESCENDANTS: |
| break; |
| default: |
| throw new IllegalArgumentException("must be one of FOCUS_BEFORE_DESCENDANTS, " |
| + "FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS"); |
| } |
| mGroupFlags &= ~FLAG_MASK_FOCUSABILITY; |
| mGroupFlags |= (focusability & FLAG_MASK_FOCUSABILITY); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) { |
| if (mFocused != null) { |
| mFocused.unFocus(); |
| mFocused = null; |
| } |
| super.handleFocusGainInternal(direction, previouslyFocusedRect); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void requestChildFocus(View child, View focused) { |
| if (DBG) { |
| System.out.println(this + " requestChildFocus()"); |
| } |
| if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) { |
| return; |
| } |
| |
| // Unfocus us, if necessary |
| super.unFocus(); |
| |
| // We had a previous notion of who had focus. Clear it. |
| if (mFocused != child) { |
| if (mFocused != null) { |
| mFocused.unFocus(); |
| } |
| |
| mFocused = child; |
| } |
| if (mParent != null) { |
| mParent.requestChildFocus(this, focused); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void focusableViewAvailable(View v) { |
| if (mParent != null |
| // shortcut: don't report a new focusable view if we block our descendants from |
| // getting focus |
| && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS) |
| // shortcut: don't report a new focusable view if we already are focused |
| // (and we don't prefer our descendants) |
| // |
| // note: knowing that mFocused is non-null is not a good enough reason |
| // to break the traversal since in that case we'd actually have to find |
| // the focused view and make sure it wasn't FOCUS_AFTER_DESCENDANTS and |
| // an ancestor of v; this will get checked for at ViewAncestor |
| && !(isFocused() && getDescendantFocusability() != FOCUS_AFTER_DESCENDANTS)) { |
| mParent.focusableViewAvailable(v); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean showContextMenuForChild(View originalView) { |
| return mParent != null && mParent.showContextMenuForChild(originalView); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) { |
| return mParent != null ? mParent.startActionModeForChild(originalView, callback) : null; |
| } |
| |
| /** |
| * Find the nearest view in the specified direction that wants to take |
| * focus. |
| * |
| * @param focused The view that currently has focus |
| * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and |
| * FOCUS_RIGHT, or 0 for not applicable. |
| */ |
| public View focusSearch(View focused, int direction) { |
| if (isRootNamespace()) { |
| // root namespace means we should consider ourselves the top of the |
| // tree for focus searching; otherwise we could be focus searching |
| // into other tabs. see LocalActivityManager and TabHost for more info |
| return FocusFinder.getInstance().findNextFocus(this, focused, direction); |
| } else if (mParent != null) { |
| return mParent.focusSearch(focused, direction); |
| } |
| return null; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) { |
| return false; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) { |
| ViewParent parent = getParent(); |
| if (parent == null) { |
| return false; |
| } |
| final boolean propagate = onRequestSendAccessibilityEvent(child, event); |
| //noinspection SimplifiableIfStatement |
| if (!propagate) { |
| return false; |
| } |
| return parent.requestSendAccessibilityEvent(this, event); |
| } |
| |
| /** |
| * Called when a child has requested sending an {@link AccessibilityEvent} and |
| * gives an opportunity to its parent to augment the event. |
| * <p> |
| * If an {@link android.view.View.AccessibilityDelegate} has been specified via calling |
| * {@link android.view.View#setAccessibilityDelegate(android.view.View.AccessibilityDelegate)} its |
| * {@link android.view.View.AccessibilityDelegate#onRequestSendAccessibilityEvent(ViewGroup, View, AccessibilityEvent)} |
| * is responsible for handling this call. |
| * </p> |
| * |
| * @param child The child which requests sending the event. |
| * @param event The event to be sent. |
| * @return True if the event should be sent. |
| * |
| * @see #requestSendAccessibilityEvent(View, AccessibilityEvent) |
| */ |
| public boolean onRequestSendAccessibilityEvent(View child, AccessibilityEvent event) { |
| if (mAccessibilityDelegate != null) { |
| return mAccessibilityDelegate.onRequestSendAccessibilityEvent(this, child, event); |
| } else { |
| return onRequestSendAccessibilityEventInternal(child, event); |
| } |
| } |
| |
| /** |
| * @see #onRequestSendAccessibilityEvent(View, AccessibilityEvent) |
| * |
| * Note: Called from the default {@link View.AccessibilityDelegate}. |
| */ |
| boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) { |
| return true; |
| } |
| |
| /** |
| * Called when a child view has changed whether or not it is tracking transient state. |
| * |
| * @hide |
| */ |
| public void childHasTransientStateChanged(View child, boolean childHasTransientState) { |
| final boolean oldHasTransientState = hasTransientState(); |
| if (childHasTransientState) { |
| mChildCountWithTransientState++; |
| } else { |
| mChildCountWithTransientState--; |
| } |
| |
| final boolean newHasTransientState = hasTransientState(); |
| if (mParent != null && oldHasTransientState != newHasTransientState) { |
| try { |
| mParent.childHasTransientStateChanged(this, newHasTransientState); |
| } catch (AbstractMethodError e) { |
| Log.e(TAG, mParent.getClass().getSimpleName() + |
| " does not fully implement ViewParent", e); |
| } |
| } |
| } |
| |
| /** |
| * @hide |
| */ |
| @Override |
| public boolean hasTransientState() { |
| return mChildCountWithTransientState > 0 || super.hasTransientState(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean dispatchUnhandledMove(View focused, int direction) { |
| return mFocused != null && |
| mFocused.dispatchUnhandledMove(focused, direction); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void clearChildFocus(View child) { |
| if (DBG) { |
| System.out.println(this + " clearChildFocus()"); |
| } |
| |
| mFocused = null; |
| if (mParent != null) { |
| mParent.clearChildFocus(this); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void clearFocus() { |
| if (DBG) { |
| System.out.println(this + " clearFocus()"); |
| } |
| if (mFocused == null) { |
| super.clearFocus(); |
| } else { |
| mFocused.clearFocus(); |
| mFocused = null; |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| void unFocus() { |
| if (DBG) { |
| System.out.println(this + " unFocus()"); |
| } |
| if (mFocused == null) { |
| super.unFocus(); |
| } else { |
| mFocused.unFocus(); |
| mFocused = null; |
| } |
| } |
| |
| /** |
| * Returns the focused child of this view, if any. The child may have focus |
| * or contain focus. |
| * |
| * @return the focused child or null. |
| */ |
| public View getFocusedChild() { |
| return mFocused; |
| } |
| |
| /** |
| * Returns true if this view has or contains focus |
| * |
| * @return true if this view has or contains focus |
| */ |
| @Override |
| public boolean hasFocus() { |
| return (mPrivateFlags & FOCUSED) != 0 || mFocused != null; |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see android.view.View#findFocus() |
| */ |
| @Override |
| public View findFocus() { |
| if (DBG) { |
| System.out.println("Find focus in " + this + ": flags=" |
| + isFocused() + ", child=" + mFocused); |
| } |
| |
| if (isFocused()) { |
| return this; |
| } |
| |
| if (mFocused != null) { |
| return mFocused.findFocus(); |
| } |
| return null; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean hasFocusable() { |
| if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) { |
| return false; |
| } |
| |
| if (isFocusable()) { |
| return true; |
| } |
| |
| final int descendantFocusability = getDescendantFocusability(); |
| if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| |
| for (int i = 0; i < count; i++) { |
| final View child = children[i]; |
| if (child.hasFocusable()) { |
| return true; |
| } |
| } |
| } |
| |
| return false; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void addFocusables(ArrayList<View> views, int direction) { |
| addFocusables(views, direction, FOCUSABLES_TOUCH_MODE); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void addFocusables(ArrayList<View> views, int direction, int focusableMode) { |
| final int focusableCount = views.size(); |
| |
| final int descendantFocusability = getDescendantFocusability(); |
| |
| if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) { |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| |
| for (int i = 0; i < count; i++) { |
| final View child = children[i]; |
| if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { |
| child.addFocusables(views, direction, focusableMode); |
| } |
| } |
| } |
| |
| // we add ourselves (if focusable) in all cases except for when we are |
| // FOCUS_AFTER_DESCENDANTS and there are some descendants focusable. this is |
| // to avoid the focus search finding layouts when a more precise search |
| // among the focusable children would be more interesting. |
| if ( |
| descendantFocusability != FOCUS_AFTER_DESCENDANTS || |
| // No focusable descendants |
| (focusableCount == views.size())) { |
| super.addFocusables(views, direction, focusableMode); |
| } |
| } |
| |
| @Override |
| public void findViewsWithText(ArrayList<View> outViews, CharSequence text, int flags) { |
| super.findViewsWithText(outViews, text, flags); |
| final int childrenCount = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < childrenCount; i++) { |
| View child = children[i]; |
| if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE |
| && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { |
| child.findViewsWithText(outViews, text, flags); |
| } |
| } |
| } |
| |
| @Override |
| View findViewByAccessibilityIdTraversal(int accessibilityId) { |
| View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId); |
| if (foundView != null) { |
| return foundView; |
| } |
| final int childrenCount = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < childrenCount; i++) { |
| View child = children[i]; |
| foundView = child.findViewByAccessibilityIdTraversal(accessibilityId); |
| if (foundView != null) { |
| return foundView; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void dispatchWindowFocusChanged(boolean hasFocus) { |
| super.dispatchWindowFocusChanged(hasFocus); |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| children[i].dispatchWindowFocusChanged(hasFocus); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void addTouchables(ArrayList<View> views) { |
| super.addTouchables(views); |
| |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| |
| for (int i = 0; i < count; i++) { |
| final View child = children[i]; |
| if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { |
| child.addTouchables(views); |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void dispatchDisplayHint(int hint) { |
| super.dispatchDisplayHint(hint); |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| children[i].dispatchDisplayHint(hint); |
| } |
| } |
| |
| /** |
| * Called when a view's visibility has changed. Notify the parent to take any appropriate |
| * action. |
| * |
| * @param child The view whose visibility has changed |
| * @param oldVisibility The previous visibility value (GONE, INVISIBLE, or VISIBLE). |
| * @param newVisibility The new visibility value (GONE, INVISIBLE, or VISIBLE). |
| * @hide |
| */ |
| protected void onChildVisibilityChanged(View child, int oldVisibility, int newVisibility) { |
| if (mTransition != null) { |
| if (newVisibility == VISIBLE) { |
| mTransition.showChild(this, child, oldVisibility); |
| } else { |
| mTransition.hideChild(this, child, newVisibility); |
| // Only track this on disappearing views - appearing views are already visible |
| // and don't need special handling during drawChild() |
| if (mVisibilityChangingChildren == null) { |
| mVisibilityChangingChildren = new ArrayList<View>(); |
| } |
| mVisibilityChangingChildren.add(child); |
| if (mTransitioningViews != null && mTransitioningViews.contains(child)) { |
| addDisappearingView(child); |
| } |
| } |
| } |
| |
| // in all cases, for drags |
| if (mCurrentDrag != null) { |
| if (newVisibility == VISIBLE) { |
| notifyChildOfDrag(child); |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected void dispatchVisibilityChanged(View changedView, int visibility) { |
| super.dispatchVisibilityChanged(changedView, visibility); |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| children[i].dispatchVisibilityChanged(changedView, visibility); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void dispatchWindowVisibilityChanged(int visibility) { |
| super.dispatchWindowVisibilityChanged(visibility); |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| children[i].dispatchWindowVisibilityChanged(visibility); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void dispatchConfigurationChanged(Configuration newConfig) { |
| super.dispatchConfigurationChanged(newConfig); |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| children[i].dispatchConfigurationChanged(newConfig); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void recomputeViewAttributes(View child) { |
| if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) { |
| ViewParent parent = mParent; |
| if (parent != null) parent.recomputeViewAttributes(this); |
| } |
| } |
| |
| @Override |
| void dispatchCollectViewAttributes(int visibility) { |
| visibility |= mViewFlags&VISIBILITY_MASK; |
| super.dispatchCollectViewAttributes(visibility); |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| children[i].dispatchCollectViewAttributes(visibility); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void bringChildToFront(View child) { |
| int index = indexOfChild(child); |
| if (index >= 0) { |
| removeFromArray(index); |
| addInArray(child, mChildrenCount); |
| child.mParent = this; |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| // TODO: Write real docs |
| @Override |
| public boolean dispatchDragEvent(DragEvent event) { |
| boolean retval = false; |
| final float tx = event.mX; |
| final float ty = event.mY; |
| |
| ViewRootImpl root = getViewRootImpl(); |
| |
| // Dispatch down the view hierarchy |
| switch (event.mAction) { |
| case DragEvent.ACTION_DRAG_STARTED: { |
| // clear state to recalculate which views we drag over |
| mCurrentDragView = null; |
| |
| // Set up our tracking of drag-started notifications |
| mCurrentDrag = DragEvent.obtain(event); |
| if (mDragNotifiedChildren == null) { |
| mDragNotifiedChildren = new HashSet<View>(); |
| } else { |
| mDragNotifiedChildren.clear(); |
| } |
| |
| // Now dispatch down to our children, caching the responses |
| mChildAcceptsDrag = false; |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| final View child = children[i]; |
| child.mPrivateFlags2 &= ~View.DRAG_MASK; |
| if (child.getVisibility() == VISIBLE) { |
| final boolean handled = notifyChildOfDrag(children[i]); |
| if (handled) { |
| mChildAcceptsDrag = true; |
| } |
| } |
| } |
| |
| // Return HANDLED if one of our children can accept the drag |
| if (mChildAcceptsDrag) { |
| retval = true; |
| } |
| } break; |
| |
| case DragEvent.ACTION_DRAG_ENDED: { |
| // Release the bookkeeping now that the drag lifecycle has ended |
| if (mDragNotifiedChildren != null) { |
| for (View child : mDragNotifiedChildren) { |
| // If a child was notified about an ongoing drag, it's told that it's over |
| child.dispatchDragEvent(event); |
| child.mPrivateFlags2 &= ~View.DRAG_MASK; |
| child.refreshDrawableState(); |
| } |
| |
| mDragNotifiedChildren.clear(); |
| mCurrentDrag.recycle(); |
| mCurrentDrag = null; |
| } |
| |
| // We consider drag-ended to have been handled if one of our children |
| // had offered to handle the drag. |
| if (mChildAcceptsDrag) { |
| retval = true; |
| } |
| } break; |
| |
| case DragEvent.ACTION_DRAG_LOCATION: { |
| // Find the [possibly new] drag target |
| final View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); |
| |
| // If we've changed apparent drag target, tell the view root which view |
| // we're over now [for purposes of the eventual drag-recipient-changed |
| // notifications to the framework] and tell the new target that the drag |
| // has entered its bounds. The root will see setDragFocus() calls all |
| // the way down to the final leaf view that is handling the LOCATION event |
| // before reporting the new potential recipient to the framework. |
| if (mCurrentDragView != target) { |
| root.setDragFocus(target); |
| |
| final int action = event.mAction; |
| // If we've dragged off of a child view, send it the EXITED message |
| if (mCurrentDragView != null) { |
| final View view = mCurrentDragView; |
| event.mAction = DragEvent.ACTION_DRAG_EXITED; |
| view.dispatchDragEvent(event); |
| view.mPrivateFlags2 &= ~View.DRAG_HOVERED; |
| view.refreshDrawableState(); |
| } |
| mCurrentDragView = target; |
| |
| // If we've dragged over a new child view, send it the ENTERED message |
| if (target != null) { |
| event.mAction = DragEvent.ACTION_DRAG_ENTERED; |
| target.dispatchDragEvent(event); |
| target.mPrivateFlags2 |= View.DRAG_HOVERED; |
| target.refreshDrawableState(); |
| } |
| event.mAction = action; // restore the event's original state |
| } |
| |
| // Dispatch the actual drag location notice, localized into its coordinates |
| if (target != null) { |
| event.mX = mLocalPoint.x; |
| event.mY = mLocalPoint.y; |
| |
| retval = target.dispatchDragEvent(event); |
| |
| event.mX = tx; |
| event.mY = ty; |
| } |
| } break; |
| |
| /* Entered / exited dispatch |
| * |
| * DRAG_ENTERED is not dispatched downwards from ViewGroup. The reason for this is |
| * that we're about to get the corresponding LOCATION event, which we will use to |
| * determine which of our children is the new target; at that point we will |
| * push a DRAG_ENTERED down to the new target child [which may itself be a ViewGroup]. |
| * |
| * DRAG_EXITED *is* dispatched all the way down immediately: once we know the |
| * drag has left this ViewGroup, we know by definition that every contained subview |
| * is also no longer under the drag point. |
| */ |
| |
| case DragEvent.ACTION_DRAG_EXITED: { |
| if (mCurrentDragView != null) { |
| final View view = mCurrentDragView; |
| view.dispatchDragEvent(event); |
| view.mPrivateFlags2 &= ~View.DRAG_HOVERED; |
| view.refreshDrawableState(); |
| |
| mCurrentDragView = null; |
| } |
| } break; |
| |
| case DragEvent.ACTION_DROP: { |
| if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, "Drop event: " + event); |
| View target = findFrontmostDroppableChildAt(event.mX, event.mY, mLocalPoint); |
| if (target != null) { |
| if (ViewDebug.DEBUG_DRAG) Log.d(View.VIEW_LOG_TAG, " dispatch drop to " + target); |
| event.mX = mLocalPoint.x; |
| event.mY = mLocalPoint.y; |
| retval = target.dispatchDragEvent(event); |
| event.mX = tx; |
| event.mY = ty; |
| } else { |
| if (ViewDebug.DEBUG_DRAG) { |
| Log.d(View.VIEW_LOG_TAG, " not dropped on an accepting view"); |
| } |
| } |
| } break; |
| } |
| |
| // If none of our children could handle the event, try here |
| if (!retval) { |
| // Call up to the View implementation that dispatches to installed listeners |
| retval = super.dispatchDragEvent(event); |
| } |
| return retval; |
| } |
| |
| // Find the frontmost child view that lies under the given point, and calculate |
| // the position within its own local coordinate system. |
| View findFrontmostDroppableChildAt(float x, float y, PointF outLocalPoint) { |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = count - 1; i >= 0; i--) { |
| final View child = children[i]; |
| if (!child.canAcceptDrag()) { |
| continue; |
| } |
| |
| if (isTransformedTouchPointInView(x, y, child, outLocalPoint)) { |
| return child; |
| } |
| } |
| return null; |
| } |
| |
| boolean notifyChildOfDrag(View child) { |
| if (ViewDebug.DEBUG_DRAG) { |
| Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child); |
| } |
| |
| boolean canAccept = false; |
| if (! mDragNotifiedChildren.contains(child)) { |
| mDragNotifiedChildren.add(child); |
| canAccept = child.dispatchDragEvent(mCurrentDrag); |
| if (canAccept && !child.canAcceptDrag()) { |
| child.mPrivateFlags2 |= View.DRAG_CAN_ACCEPT; |
| child.refreshDrawableState(); |
| } |
| } |
| return canAccept; |
| } |
| |
| @Override |
| public void dispatchSystemUiVisibilityChanged(int visible) { |
| super.dispatchSystemUiVisibilityChanged(visible); |
| |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i=0; i <count; i++) { |
| final View child = children[i]; |
| child.dispatchSystemUiVisibilityChanged(visible); |
| } |
| } |
| |
| @Override |
| void updateLocalSystemUiVisibility(int localValue, int localChanges) { |
| super.updateLocalSystemUiVisibility(localValue, localChanges); |
| |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i=0; i <count; i++) { |
| final View child = children[i]; |
| child.updateLocalSystemUiVisibility(localValue, localChanges); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean dispatchKeyEventPreIme(KeyEvent event) { |
| if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { |
| return super.dispatchKeyEventPreIme(event); |
| } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { |
| return mFocused.dispatchKeyEventPreIme(event); |
| } |
| return false; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean dispatchKeyEvent(KeyEvent event) { |
| if (mInputEventConsistencyVerifier != null) { |
| mInputEventConsistencyVerifier.onKeyEvent(event, 1); |
| } |
| |
| if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { |
| if (super.dispatchKeyEvent(event)) { |
| return true; |
| } |
| } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { |
| if (mFocused.dispatchKeyEvent(event)) { |
| return true; |
| } |
| } |
| |
| if (mInputEventConsistencyVerifier != null) { |
| mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); |
| } |
| return false; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean dispatchKeyShortcutEvent(KeyEvent event) { |
| if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { |
| return super.dispatchKeyShortcutEvent(event); |
| } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { |
| return mFocused.dispatchKeyShortcutEvent(event); |
| } |
| return false; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean dispatchTrackballEvent(MotionEvent event) { |
| if (mInputEventConsistencyVerifier != null) { |
| mInputEventConsistencyVerifier.onTrackballEvent(event, 1); |
| } |
| |
| if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { |
| if (super.dispatchTrackballEvent(event)) { |
| return true; |
| } |
| } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { |
| if (mFocused.dispatchTrackballEvent(event)) { |
| return true; |
| } |
| } |
| |
| if (mInputEventConsistencyVerifier != null) { |
| mInputEventConsistencyVerifier.onUnhandledEvent(event, 1); |
| } |
| return false; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @SuppressWarnings({"ConstantConditions"}) |
| @Override |
| protected boolean dispatchHoverEvent(MotionEvent event) { |
| final int action = event.getAction(); |
| |
| // First check whether the view group wants to intercept the hover event. |
| final boolean interceptHover = onInterceptHoverEvent(event); |
| event.setAction(action); // restore action in case it was changed |
| |
| MotionEvent eventNoHistory = event; |
| boolean handled = false; |
| |
| // Send events to the hovered children and build a new list of hover targets until |
| // one is found that handles the event. |
| HoverTarget firstOldHoverTarget = mFirstHoverTarget; |
| mFirstHoverTarget = null; |
| if (!interceptHover && action != MotionEvent.ACTION_HOVER_EXIT) { |
| final float x = event.getX(); |
| final float y = event.getY(); |
| final int childrenCount = mChildrenCount; |
| if (childrenCount != 0) { |
| final View[] children = mChildren; |
| HoverTarget lastHoverTarget = null; |
| for (int i = childrenCount - 1; i >= 0; i--) { |
| final View child = children[i]; |
| if (!canViewReceivePointerEvents(child) |
| || !isTransformedTouchPointInView(x, y, child, null)) { |
| continue; |
| } |
| |
| // Obtain a hover target for this child. Dequeue it from the |
| // old hover target list if the child was previously hovered. |
| HoverTarget hoverTarget = firstOldHoverTarget; |
| final boolean wasHovered; |
| for (HoverTarget predecessor = null; ;) { |
| if (hoverTarget == null) { |
| hoverTarget = HoverTarget.obtain(child); |
| wasHovered = false; |
| break; |
| } |
| |
| if (hoverTarget.child == child) { |
| if (predecessor != null) { |
| predecessor.next = hoverTarget.next; |
| } else { |
| firstOldHoverTarget = hoverTarget.next; |
| } |
| hoverTarget.next = null; |
| wasHovered = true; |
| break; |
| } |
| |
| predecessor = hoverTarget; |
| hoverTarget = hoverTarget.next; |
| } |
| |
| // Enqueue the hover target onto the new hover target list. |
| if (lastHoverTarget != null) { |
| lastHoverTarget.next = hoverTarget; |
| } else { |
| lastHoverTarget = hoverTarget; |
| mFirstHoverTarget = hoverTarget; |
| } |
| |
| // Dispatch the event to the child. |
| if (action == MotionEvent.ACTION_HOVER_ENTER) { |
| if (!wasHovered) { |
| // Send the enter as is. |
| handled |= dispatchTransformedGenericPointerEvent( |
| event, child); // enter |
| } |
| } else if (action == MotionEvent.ACTION_HOVER_MOVE) { |
| if (!wasHovered) { |
| // Synthesize an enter from a move. |
| eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); |
| eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); |
| handled |= dispatchTransformedGenericPointerEvent( |
| eventNoHistory, child); // enter |
| eventNoHistory.setAction(action); |
| |
| handled |= dispatchTransformedGenericPointerEvent( |
| eventNoHistory, child); // move |
| } else { |
| // Send the move as is. |
| handled |= dispatchTransformedGenericPointerEvent(event, child); |
| } |
| } |
| if (handled) { |
| break; |
| } |
| } |
| } |
| } |
| |
| // Send exit events to all previously hovered children that are no longer hovered. |
| while (firstOldHoverTarget != null) { |
| final View child = firstOldHoverTarget.child; |
| |
| // Exit the old hovered child. |
| if (action == MotionEvent.ACTION_HOVER_EXIT) { |
| // Send the exit as is. |
| handled |= dispatchTransformedGenericPointerEvent( |
| event, child); // exit |
| } else { |
| // Synthesize an exit from a move or enter. |
| // Ignore the result because hover focus has moved to a different view. |
| if (action == MotionEvent.ACTION_HOVER_MOVE) { |
| dispatchTransformedGenericPointerEvent( |
| event, child); // move |
| } |
| eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); |
| eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); |
| dispatchTransformedGenericPointerEvent( |
| eventNoHistory, child); // exit |
| eventNoHistory.setAction(action); |
| } |
| |
| final HoverTarget nextOldHoverTarget = firstOldHoverTarget.next; |
| firstOldHoverTarget.recycle(); |
| firstOldHoverTarget = nextOldHoverTarget; |
| } |
| |
| // Send events to the view group itself if no children have handled it. |
| boolean newHoveredSelf = !handled; |
| if (newHoveredSelf == mHoveredSelf) { |
| if (newHoveredSelf) { |
| // Send event to the view group as before. |
| handled |= super.dispatchHoverEvent(event); |
| } |
| } else { |
| if (mHoveredSelf) { |
| // Exit the view group. |
| if (action == MotionEvent.ACTION_HOVER_EXIT) { |
| // Send the exit as is. |
| handled |= super.dispatchHoverEvent(event); // exit |
| } else { |
| // Synthesize an exit from a move or enter. |
| // Ignore the result because hover focus is moving to a different view. |
| if (action == MotionEvent.ACTION_HOVER_MOVE) { |
| super.dispatchHoverEvent(event); // move |
| } |
| eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); |
| eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT); |
| super.dispatchHoverEvent(eventNoHistory); // exit |
| eventNoHistory.setAction(action); |
| } |
| mHoveredSelf = false; |
| } |
| |
| if (newHoveredSelf) { |
| // Enter the view group. |
| if (action == MotionEvent.ACTION_HOVER_ENTER) { |
| // Send the enter as is. |
| handled |= super.dispatchHoverEvent(event); // enter |
| mHoveredSelf = true; |
| } else if (action == MotionEvent.ACTION_HOVER_MOVE) { |
| // Synthesize an enter from a move. |
| eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory); |
| eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER); |
| handled |= super.dispatchHoverEvent(eventNoHistory); // enter |
| eventNoHistory.setAction(action); |
| |
| handled |= super.dispatchHoverEvent(eventNoHistory); // move |
| mHoveredSelf = true; |
| } |
| } |
| } |
| |
| // Recycle the copy of the event that we made. |
| if (eventNoHistory != event) { |
| eventNoHistory.recycle(); |
| } |
| |
| // Done. |
| return handled; |
| } |
| |
| /** @hide */ |
| @Override |
| protected boolean hasHoveredChild() { |
| return mFirstHoverTarget != null; |
| } |
| |
| /** |
| * Implement this method to intercept hover events before they are handled |
| * by child views. |
| * <p> |
| * This method is called before dispatching a hover event to a child of |
| * the view group or to the view group's own {@link #onHoverEvent} to allow |
| * the view group a chance to intercept the hover event. |
| * This method can also be used to watch all pointer motions that occur within |
| * the bounds of the view group even when the pointer is hovering over |
| * a child of the view group rather than over the view group itself. |
| * </p><p> |
| * The view group can prevent its children from receiving hover events by |
| * implementing this method and returning <code>true</code> to indicate |
| * that it would like to intercept hover events. The view group must |
| * continuously return <code>true</code> from {@link #onInterceptHoverEvent} |
| * for as long as it wishes to continue intercepting hover events from |
| * its children. |
| * </p><p> |
| * Interception preserves the invariant that at most one view can be |
| * hovered at a time by transferring hover focus from the currently hovered |
| * child to the view group or vice-versa as needed. |
| * </p><p> |
| * If this method returns <code>true</code> and a child is already hovered, then the |
| * child view will first receive a hover exit event and then the view group |
| * itself will receive a hover enter event in {@link #onHoverEvent}. |
| * Likewise, if this method had previously returned <code>true</code> to intercept hover |
| * events and instead returns <code>false</code> while the pointer is hovering |
| * within the bounds of one of a child, then the view group will first receive a |
| * hover exit event in {@link #onHoverEvent} and then the hovered child will |
| * receive a hover enter event. |
| * </p><p> |
| * The default implementation always returns false. |
| * </p> |
| * |
| * @param event The motion event that describes the hover. |
| * @return True if the view group would like to intercept the hover event |
| * and prevent its children from receiving it. |
| */ |
| public boolean onInterceptHoverEvent(MotionEvent event) { |
| return false; |
| } |
| |
| private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) { |
| if (event.getHistorySize() == 0) { |
| return event; |
| } |
| return MotionEvent.obtainNoHistory(event); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected boolean dispatchGenericPointerEvent(MotionEvent event) { |
| // Send the event to the child under the pointer. |
| final int childrenCount = mChildrenCount; |
| if (childrenCount != 0) { |
| final View[] children = mChildren; |
| final float x = event.getX(); |
| final float y = event.getY(); |
| |
| for (int i = childrenCount - 1; i >= 0; i--) { |
| final View child = children[i]; |
| if (!canViewReceivePointerEvents(child) |
| || !isTransformedTouchPointInView(x, y, child, null)) { |
| continue; |
| } |
| |
| if (dispatchTransformedGenericPointerEvent(event, child)) { |
| return true; |
| } |
| } |
| } |
| |
| // No child handled the event. Send it to this view group. |
| return super.dispatchGenericPointerEvent(event); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected boolean dispatchGenericFocusedEvent(MotionEvent event) { |
| // Send the event to the focused child or to this view group if it has focus. |
| if ((mPrivateFlags & (FOCUSED | HAS_BOUNDS)) == (FOCUSED | HAS_BOUNDS)) { |
| return super.dispatchGenericFocusedEvent(event); |
| } else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) { |
| return mFocused.dispatchGenericMotionEvent(event); |
| } |
| return false; |
| } |
| |
| /** |
| * Dispatches a generic pointer event to a child, taking into account |
| * transformations that apply to the child. |
| * |
| * @param event The event to send. |
| * @param child The view to send the event to. |
| * @return {@code true} if the child handled the event. |
| */ |
| private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) { |
| final float offsetX = mScrollX - child.mLeft; |
| final float offsetY = mScrollY - child.mTop; |
| |
| boolean handled; |
| if (!child.hasIdentityMatrix()) { |
| MotionEvent transformedEvent = MotionEvent.obtain(event); |
| transformedEvent.offsetLocation(offsetX, offsetY); |
| transformedEvent.transform(child.getInverseMatrix()); |
| handled = child.dispatchGenericMotionEvent(transformedEvent); |
| transformedEvent.recycle(); |
| } else { |
| event.offsetLocation(offsetX, offsetY); |
| handled = child.dispatchGenericMotionEvent(event); |
| event.offsetLocation(-offsetX, -offsetY); |
| } |
| return handled; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean dispatchTouchEvent(MotionEvent ev) { |
| if (mInputEventConsistencyVerifier != null) { |
| mInputEventConsistencyVerifier.onTouchEvent(ev, 1); |
| } |
| |
| boolean handled = false; |
| if (onFilterTouchEventForSecurity(ev)) { |
| final int action = ev.getAction(); |
| final int actionMasked = action & MotionEvent.ACTION_MASK; |
| |
| // Handle an initial down. |
| if (actionMasked == MotionEvent.ACTION_DOWN) { |
| // Throw away all previous state when starting a new touch gesture. |
| // The framework may have dropped the up or cancel event for the previous gesture |
| // due to an app switch, ANR, or some other state change. |
| cancelAndClearTouchTargets(ev); |
| resetTouchState(); |
| } |
| |
| // Check for interception. |
| final boolean intercepted; |
| if (actionMasked == MotionEvent.ACTION_DOWN |
| || mFirstTouchTarget != null) { |
| final boolean disallowIntercept = (mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0; |
| if (!disallowIntercept) { |
| intercepted = onInterceptTouchEvent(ev); |
| ev.setAction(action); // restore action in case it was changed |
| } else { |
| intercepted = false; |
| } |
| } else { |
| // There are no touch targets and this action is not an initial down |
| // so this view group continues to intercept touches. |
| intercepted = true; |
| } |
| |
| // Check for cancelation. |
| final boolean canceled = resetCancelNextUpFlag(this) |
| || actionMasked == MotionEvent.ACTION_CANCEL; |
| |
| // Update list of touch targets for pointer down, if needed. |
| final boolean split = (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) != 0; |
| TouchTarget newTouchTarget = null; |
| boolean alreadyDispatchedToNewTouchTarget = false; |
| if (!canceled && !intercepted) { |
| if (actionMasked == MotionEvent.ACTION_DOWN |
| || (split && actionMasked == MotionEvent.ACTION_POINTER_DOWN) |
| || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { |
| final int actionIndex = ev.getActionIndex(); // always 0 for down |
| final int idBitsToAssign = split ? 1 << ev.getPointerId(actionIndex) |
| : TouchTarget.ALL_POINTER_IDS; |
| |
| // Clean up earlier touch targets for this pointer id in case they |
| // have become out of sync. |
| removePointersFromTouchTargets(idBitsToAssign); |
| |
| final int childrenCount = mChildrenCount; |
| if (childrenCount != 0) { |
| // Find a child that can receive the event. |
| // Scan children from front to back. |
| final View[] children = mChildren; |
| final float x = ev.getX(actionIndex); |
| final float y = ev.getY(actionIndex); |
| |
| for (int i = childrenCount - 1; i >= 0; i--) { |
| final View child = children[i]; |
| if (!canViewReceivePointerEvents(child) |
| || !isTransformedTouchPointInView(x, y, child, null)) { |
| continue; |
| } |
| |
| newTouchTarget = getTouchTarget(child); |
| if (newTouchTarget != null) { |
| // Child is already receiving touch within its bounds. |
| // Give it the new pointer in addition to the ones it is handling. |
| newTouchTarget.pointerIdBits |= idBitsToAssign; |
| break; |
| } |
| |
| resetCancelNextUpFlag(child); |
| if (dispatchTransformedTouchEvent(ev, false, child, idBitsToAssign)) { |
| // Child wants to receive touch within its bounds. |
| mLastTouchDownTime = ev.getDownTime(); |
| mLastTouchDownIndex = i; |
| mLastTouchDownX = ev.getX(); |
| mLastTouchDownY = ev.getY(); |
| newTouchTarget = addTouchTarget(child, idBitsToAssign); |
| alreadyDispatchedToNewTouchTarget = true; |
| break; |
| } |
| } |
| } |
| |
| if (newTouchTarget == null && mFirstTouchTarget != null) { |
| // Did not find a child to receive the event. |
| // Assign the pointer to the least recently added target. |
| newTouchTarget = mFirstTouchTarget; |
| while (newTouchTarget.next != null) { |
| newTouchTarget = newTouchTarget.next; |
| } |
| newTouchTarget.pointerIdBits |= idBitsToAssign; |
| } |
| } |
| } |
| |
| // Dispatch to touch targets. |
| if (mFirstTouchTarget == null) { |
| // No touch targets so treat this as an ordinary view. |
| handled = dispatchTransformedTouchEvent(ev, canceled, null, |
| TouchTarget.ALL_POINTER_IDS); |
| } else { |
| // Dispatch to touch targets, excluding the new touch target if we already |
| // dispatched to it. Cancel touch targets if necessary. |
| TouchTarget predecessor = null; |
| TouchTarget target = mFirstTouchTarget; |
| while (target != null) { |
| final TouchTarget next = target.next; |
| if (alreadyDispatchedToNewTouchTarget && target == newTouchTarget) { |
| handled = true; |
| } else { |
| final boolean cancelChild = resetCancelNextUpFlag(target.child) |
| || intercepted; |
| if (dispatchTransformedTouchEvent(ev, cancelChild, |
| target.child, target.pointerIdBits)) { |
| handled = true; |
| } |
| if (cancelChild) { |
| if (predecessor == null) { |
| mFirstTouchTarget = next; |
| } else { |
| predecessor.next = next; |
| } |
| target.recycle(); |
| target = next; |
| continue; |
| } |
| } |
| predecessor = target; |
| target = next; |
| } |
| } |
| |
| // Update list of touch targets for pointer up or cancel, if needed. |
| if (canceled |
| || actionMasked == MotionEvent.ACTION_UP |
| || actionMasked == MotionEvent.ACTION_HOVER_MOVE) { |
| resetTouchState(); |
| } else if (split && actionMasked == MotionEvent.ACTION_POINTER_UP) { |
| final int actionIndex = ev.getActionIndex(); |
| final int idBitsToRemove = 1 << ev.getPointerId(actionIndex); |
| removePointersFromTouchTargets(idBitsToRemove); |
| } |
| } |
| |
| if (!handled && mInputEventConsistencyVerifier != null) { |
| mInputEventConsistencyVerifier.onUnhandledEvent(ev, 1); |
| } |
| return handled; |
| } |
| |
| /** |
| * Resets all touch state in preparation for a new cycle. |
| */ |
| private void resetTouchState() { |
| clearTouchTargets(); |
| resetCancelNextUpFlag(this); |
| mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; |
| } |
| |
| /** |
| * Resets the cancel next up flag. |
| * Returns true if the flag was previously set. |
| */ |
| private static boolean resetCancelNextUpFlag(View view) { |
| if ((view.mPrivateFlags & CANCEL_NEXT_UP_EVENT) != 0) { |
| view.mPrivateFlags &= ~CANCEL_NEXT_UP_EVENT; |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * Clears all touch targets. |
| */ |
| private void clearTouchTargets() { |
| TouchTarget target = mFirstTouchTarget; |
| if (target != null) { |
| do { |
| TouchTarget next = target.next; |
| target.recycle(); |
| target = next; |
| } while (target != null); |
| mFirstTouchTarget = null; |
| } |
| } |
| |
| /** |
| * Cancels and clears all touch targets. |
| */ |
| private void cancelAndClearTouchTargets(MotionEvent event) { |
| if (mFirstTouchTarget != null) { |
| boolean syntheticEvent = false; |
| if (event == null) { |
| final long now = SystemClock.uptimeMillis(); |
| event = MotionEvent.obtain(now, now, |
| MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0); |
| event.setSource(InputDevice.SOURCE_TOUCHSCREEN); |
| syntheticEvent = true; |
| } |
| |
| for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { |
| resetCancelNextUpFlag(target.child); |
| dispatchTransformedTouchEvent(event, true, target.child, target.pointerIdBits); |
| } |
| clearTouchTargets(); |
| |
| if (syntheticEvent) { |
| event.recycle(); |
| } |
| } |
| } |
| |
| /** |
| * Gets the touch target for specified child view. |
| * Returns null if not found. |
| */ |
| private TouchTarget getTouchTarget(View child) { |
| for (TouchTarget target = mFirstTouchTarget; target != null; target = target.next) { |
| if (target.child == child) { |
| return target; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * Adds a touch target for specified child to the beginning of the list. |
| * Assumes the target child is not already present. |
| */ |
| private TouchTarget addTouchTarget(View child, int pointerIdBits) { |
| TouchTarget target = TouchTarget.obtain(child, pointerIdBits); |
| target.next = mFirstTouchTarget; |
| mFirstTouchTarget = target; |
| return target; |
| } |
| |
| /** |
| * Removes the pointer ids from consideration. |
| */ |
| private void removePointersFromTouchTargets(int pointerIdBits) { |
| TouchTarget predecessor = null; |
| TouchTarget target = mFirstTouchTarget; |
| while (target != null) { |
| final TouchTarget next = target.next; |
| if ((target.pointerIdBits & pointerIdBits) != 0) { |
| target.pointerIdBits &= ~pointerIdBits; |
| if (target.pointerIdBits == 0) { |
| if (predecessor == null) { |
| mFirstTouchTarget = next; |
| } else { |
| predecessor.next = next; |
| } |
| target.recycle(); |
| target = next; |
| continue; |
| } |
| } |
| predecessor = target; |
| target = next; |
| } |
| } |
| |
| /** |
| * Returns true if a child view can receive pointer events. |
| * @hide |
| */ |
| private static boolean canViewReceivePointerEvents(View child) { |
| return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE |
| || child.getAnimation() != null; |
| } |
| |
| /** |
| * Returns true if a child view contains the specified point when transformed |
| * into its coordinate space. |
| * Child must not be null. |
| * @hide |
| */ |
| protected boolean isTransformedTouchPointInView(float x, float y, View child, |
| PointF outLocalPoint) { |
| float localX = x + mScrollX - child.mLeft; |
| float localY = y + mScrollY - child.mTop; |
| if (! child.hasIdentityMatrix() && mAttachInfo != null) { |
| final float[] localXY = mAttachInfo.mTmpTransformLocation; |
| localXY[0] = localX; |
| localXY[1] = localY; |
| child.getInverseMatrix().mapPoints(localXY); |
| localX = localXY[0]; |
| localY = localXY[1]; |
| } |
| final boolean isInView = child.pointInView(localX, localY); |
| if (isInView && outLocalPoint != null) { |
| outLocalPoint.set(localX, localY); |
| } |
| return isInView; |
| } |
| |
| /** |
| * Transforms a motion event into the coordinate space of a particular child view, |
| * filters out irrelevant pointer ids, and overrides its action if necessary. |
| * If child is null, assumes the MotionEvent will be sent to this ViewGroup instead. |
| */ |
| private boolean dispatchTransformedTouchEvent(MotionEvent event, boolean cancel, |
| View child, int desiredPointerIdBits) { |
| final boolean handled; |
| |
| // Canceling motions is a special case. We don't need to perform any transformations |
| // or filtering. The important part is the action, not the contents. |
| final int oldAction = event.getAction(); |
| if (cancel || oldAction == MotionEvent.ACTION_CANCEL) { |
| event.setAction(MotionEvent.ACTION_CANCEL); |
| if (child == null) { |
| handled = super.dispatchTouchEvent(event); |
| } else { |
| handled = child.dispatchTouchEvent(event); |
| } |
| event.setAction(oldAction); |
| return handled; |
| } |
| |
| // Calculate the number of pointers to deliver. |
| final int oldPointerIdBits = event.getPointerIdBits(); |
| final int newPointerIdBits = oldPointerIdBits & desiredPointerIdBits; |
| |
| // If for some reason we ended up in an inconsistent state where it looks like we |
| // might produce a motion event with no pointers in it, then drop the event. |
| if (newPointerIdBits == 0) { |
| return false; |
| } |
| |
| // If the number of pointers is the same and we don't need to perform any fancy |
| // irreversible transformations, then we can reuse the motion event for this |
| // dispatch as long as we are careful to revert any changes we make. |
| // Otherwise we need to make a copy. |
| final MotionEvent transformedEvent; |
| if (newPointerIdBits == oldPointerIdBits) { |
| if (child == null || child.hasIdentityMatrix()) { |
| if (child == null) { |
| handled = super.dispatchTouchEvent(event); |
| } else { |
| final float offsetX = mScrollX - child.mLeft; |
| final float offsetY = mScrollY - child.mTop; |
| event.offsetLocation(offsetX, offsetY); |
| |
| handled = child.dispatchTouchEvent(event); |
| |
| event.offsetLocation(-offsetX, -offsetY); |
| } |
| return handled; |
| } |
| transformedEvent = MotionEvent.obtain(event); |
| } else { |
| transformedEvent = event.split(newPointerIdBits); |
| } |
| |
| // Perform any necessary transformations and dispatch. |
| if (child == null) { |
| handled = super.dispatchTouchEvent(transformedEvent); |
| } else { |
| final float offsetX = mScrollX - child.mLeft; |
| final float offsetY = mScrollY - child.mTop; |
| transformedEvent.offsetLocation(offsetX, offsetY); |
| if (! child.hasIdentityMatrix()) { |
| transformedEvent.transform(child.getInverseMatrix()); |
| } |
| |
| handled = child.dispatchTouchEvent(transformedEvent); |
| } |
| |
| // Done. |
| transformedEvent.recycle(); |
| return handled; |
| } |
| |
| /** |
| * Enable or disable the splitting of MotionEvents to multiple children during touch event |
| * dispatch. This behavior is enabled by default for applications that target an |
| * SDK version of {@link Build.VERSION_CODES#HONEYCOMB} or newer. |
| * |
| * <p>When this option is enabled MotionEvents may be split and dispatched to different child |
| * views depending on where each pointer initially went down. This allows for user interactions |
| * such as scrolling two panes of content independently, chording of buttons, and performing |
| * independent gestures on different pieces of content. |
| * |
| * @param split <code>true</code> to allow MotionEvents to be split and dispatched to multiple |
| * child views. <code>false</code> to only allow one child view to be the target of |
| * any MotionEvent received by this ViewGroup. |
| */ |
| public void setMotionEventSplittingEnabled(boolean split) { |
| // TODO Applications really shouldn't change this setting mid-touch event, |
| // but perhaps this should handle that case and send ACTION_CANCELs to any child views |
| // with gestures in progress when this is changed. |
| if (split) { |
| mGroupFlags |= FLAG_SPLIT_MOTION_EVENTS; |
| } else { |
| mGroupFlags &= ~FLAG_SPLIT_MOTION_EVENTS; |
| } |
| } |
| |
| /** |
| * Returns true if MotionEvents dispatched to this ViewGroup can be split to multiple children. |
| * @return true if MotionEvents dispatched to this ViewGroup can be split to multiple children. |
| */ |
| public boolean isMotionEventSplittingEnabled() { |
| return (mGroupFlags & FLAG_SPLIT_MOTION_EVENTS) == FLAG_SPLIT_MOTION_EVENTS; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) { |
| |
| if (disallowIntercept == ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) != 0)) { |
| // We're already in this state, assume our ancestors are too |
| return; |
| } |
| |
| if (disallowIntercept) { |
| mGroupFlags |= FLAG_DISALLOW_INTERCEPT; |
| } else { |
| mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT; |
| } |
| |
| // Pass it up to our parent |
| if (mParent != null) { |
| mParent.requestDisallowInterceptTouchEvent(disallowIntercept); |
| } |
| } |
| |
| /** |
| * Implement this method to intercept all touch screen motion events. This |
| * allows you to watch events as they are dispatched to your children, and |
| * take ownership of the current gesture at any point. |
| * |
| * <p>Using this function takes some care, as it has a fairly complicated |
| * interaction with {@link View#onTouchEvent(MotionEvent) |
| * View.onTouchEvent(MotionEvent)}, and using it requires implementing |
| * that method as well as this one in the correct way. Events will be |
| * received in the following order: |
| * |
| * <ol> |
| * <li> You will receive the down event here. |
| * <li> The down event will be handled either by a child of this view |
| * group, or given to your own onTouchEvent() method to handle; this means |
| * you should implement onTouchEvent() to return true, so you will |
| * continue to see the rest of the gesture (instead of looking for |
| * a parent view to handle it). Also, by returning true from |
| * onTouchEvent(), you will not receive any following |
| * events in onInterceptTouchEvent() and all touch processing must |
| * happen in onTouchEvent() like normal. |
| * <li> For as long as you return false from this function, each following |
| * event (up to and including the final up) will be delivered first here |
| * and then to the target's onTouchEvent(). |
| * <li> If you return true from here, you will not receive any |
| * following events: the target view will receive the same event but |
| * with the action {@link MotionEvent#ACTION_CANCEL}, and all further |
| * events will be delivered to your onTouchEvent() method and no longer |
| * appear here. |
| * </ol> |
| * |
| * @param ev The motion event being dispatched down the hierarchy. |
| * @return Return true to steal motion events from the children and have |
| * them dispatched to this ViewGroup through onTouchEvent(). |
| * The current target will receive an ACTION_CANCEL event, and no further |
| * messages will be delivered here. |
| */ |
| public boolean onInterceptTouchEvent(MotionEvent ev) { |
| return false; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Looks for a view to give focus to respecting the setting specified by |
| * {@link #getDescendantFocusability()}. |
| * |
| * Uses {@link #onRequestFocusInDescendants(int, android.graphics.Rect)} to |
| * find focus within the children of this group when appropriate. |
| * |
| * @see #FOCUS_BEFORE_DESCENDANTS |
| * @see #FOCUS_AFTER_DESCENDANTS |
| * @see #FOCUS_BLOCK_DESCENDANTS |
| * @see #onRequestFocusInDescendants(int, android.graphics.Rect) |
| */ |
| @Override |
| public boolean requestFocus(int direction, Rect previouslyFocusedRect) { |
| if (DBG) { |
| System.out.println(this + " ViewGroup.requestFocus direction=" |
| + direction); |
| } |
| int descendantFocusability = getDescendantFocusability(); |
| |
| switch (descendantFocusability) { |
| case FOCUS_BLOCK_DESCENDANTS: |
| return super.requestFocus(direction, previouslyFocusedRect); |
| case FOCUS_BEFORE_DESCENDANTS: { |
| final boolean took = super.requestFocus(direction, previouslyFocusedRect); |
| return took ? took : onRequestFocusInDescendants(direction, previouslyFocusedRect); |
| } |
| case FOCUS_AFTER_DESCENDANTS: { |
| final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); |
| return took ? took : super.requestFocus(direction, previouslyFocusedRect); |
| } |
| default: |
| throw new IllegalStateException("descendant focusability must be " |
| + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " |
| + "but is " + descendantFocusability); |
| } |
| } |
| |
| /** |
| * Look for a descendant to call {@link View#requestFocus} on. |
| * Called by {@link ViewGroup#requestFocus(int, android.graphics.Rect)} |
| * when it wants to request focus within its children. Override this to |
| * customize how your {@link ViewGroup} requests focus within its children. |
| * @param direction One of FOCUS_UP, FOCUS_DOWN, FOCUS_LEFT, and FOCUS_RIGHT |
| * @param previouslyFocusedRect The rectangle (in this View's coordinate system) |
| * to give a finer grained hint about where focus is coming from. May be null |
| * if there is no hint. |
| * @return Whether focus was taken. |
| */ |
| @SuppressWarnings({"ConstantConditions"}) |
| protected boolean onRequestFocusInDescendants(int direction, |
| Rect previouslyFocusedRect) { |
| int index; |
| int increment; |
| int end; |
| int count = mChildrenCount; |
| if ((direction & FOCUS_FORWARD) != 0) { |
| index = 0; |
| increment = 1; |
| end = count; |
| } else { |
| index = count - 1; |
| increment = -1; |
| end = -1; |
| } |
| final View[] children = mChildren; |
| for (int i = index; i != end; i += increment) { |
| View child = children[i]; |
| if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { |
| if (child.requestFocus(direction, previouslyFocusedRect)) { |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @hide |
| */ |
| @Override |
| public void dispatchStartTemporaryDetach() { |
| super.dispatchStartTemporaryDetach(); |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| children[i].dispatchStartTemporaryDetach(); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| * |
| * @hide |
| */ |
| @Override |
| public void dispatchFinishTemporaryDetach() { |
| super.dispatchFinishTemporaryDetach(); |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| children[i].dispatchFinishTemporaryDetach(); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| void dispatchAttachedToWindow(AttachInfo info, int visibility) { |
| mGroupFlags |= FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; |
| super.dispatchAttachedToWindow(info, visibility); |
| mGroupFlags &= ~FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW; |
| |
| visibility |= mViewFlags & VISIBILITY_MASK; |
| |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| children[i].dispatchAttachedToWindow(info, visibility); |
| } |
| } |
| |
| @Override |
| void dispatchScreenStateChanged(int screenState) { |
| super.dispatchScreenStateChanged(screenState); |
| |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| children[i].dispatchScreenStateChanged(screenState); |
| } |
| } |
| |
| @Override |
| boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) { |
| boolean handled = super.dispatchPopulateAccessibilityEventInternal(event); |
| if (handled) { |
| return handled; |
| } |
| // Let our children have a shot in populating the event. |
| for (int i = 0, count = getChildCount(); i < count; i++) { |
| View child = getChildAt(i); |
| if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { |
| handled = getChildAt(i).dispatchPopulateAccessibilityEvent(event); |
| if (handled) { |
| return handled; |
| } |
| } |
| } |
| return false; |
| } |
| |
| @Override |
| void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) { |
| super.onInitializeAccessibilityNodeInfoInternal(info); |
| info.setClassName(ViewGroup.class.getName()); |
| for (int i = 0, count = mChildrenCount; i < count; i++) { |
| View child = mChildren[i]; |
| if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE |
| && (child.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { |
| info.addChild(child); |
| } |
| } |
| } |
| |
| @Override |
| void onInitializeAccessibilityEventInternal(AccessibilityEvent event) { |
| super.onInitializeAccessibilityEventInternal(event); |
| event.setClassName(ViewGroup.class.getName()); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| void dispatchDetachedFromWindow() { |
| // If we still have a touch target, we are still in the process of |
| // dispatching motion events to a child; we need to get rid of that |
| // child to avoid dispatching events to it after the window is torn |
| // down. To make sure we keep the child in a consistent state, we |
| // first send it an ACTION_CANCEL motion event. |
| cancelAndClearTouchTargets(null); |
| |
| // In case view is detached while transition is running |
| mLayoutSuppressed = false; |
| |
| // Tear down our drag tracking |
| mDragNotifiedChildren = null; |
| if (mCurrentDrag != null) { |
| mCurrentDrag.recycle(); |
| mCurrentDrag = null; |
| } |
| |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| children[i].dispatchDetachedFromWindow(); |
| } |
| super.dispatchDetachedFromWindow(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void setPadding(int left, int top, int right, int bottom) { |
| super.setPadding(left, top, right, bottom); |
| |
| if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) { |
| mGroupFlags |= FLAG_PADDING_NOT_NULL; |
| } else { |
| mGroupFlags &= ~FLAG_PADDING_NOT_NULL; |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) { |
| super.dispatchSaveInstanceState(container); |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| View c = children[i]; |
| if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { |
| c.dispatchSaveInstanceState(container); |
| } |
| } |
| } |
| |
| /** |
| * Perform dispatching of a {@link #saveHierarchyState(android.util.SparseArray)} freeze()} |
| * to only this view, not to its children. For use when overriding |
| * {@link #dispatchSaveInstanceState(android.util.SparseArray)} dispatchFreeze()} to allow |
| * subclasses to freeze their own state but not the state of their children. |
| * |
| * @param container the container |
| */ |
| protected void dispatchFreezeSelfOnly(SparseArray<Parcelable> container) { |
| super.dispatchSaveInstanceState(container); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) { |
| super.dispatchRestoreInstanceState(container); |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| View c = children[i]; |
| if ((c.mViewFlags & PARENT_SAVE_DISABLED_MASK) != PARENT_SAVE_DISABLED) { |
| c.dispatchRestoreInstanceState(container); |
| } |
| } |
| } |
| |
| /** |
| * Perform dispatching of a {@link #restoreHierarchyState(android.util.SparseArray)} |
| * to only this view, not to its children. For use when overriding |
| * {@link #dispatchRestoreInstanceState(android.util.SparseArray)} to allow |
| * subclasses to thaw their own state but not the state of their children. |
| * |
| * @param container the container |
| */ |
| protected void dispatchThawSelfOnly(SparseArray<Parcelable> container) { |
| super.dispatchRestoreInstanceState(container); |
| } |
| |
| /** |
| * Enables or disables the drawing cache for each child of this view group. |
| * |
| * @param enabled true to enable the cache, false to dispose of it |
| */ |
| protected void setChildrenDrawingCacheEnabled(boolean enabled) { |
| if (enabled || (mPersistentDrawingCache & PERSISTENT_ALL_CACHES) != PERSISTENT_ALL_CACHES) { |
| final View[] children = mChildren; |
| final int count = mChildrenCount; |
| for (int i = 0; i < count; i++) { |
| children[i].setDrawingCacheEnabled(enabled); |
| } |
| } |
| } |
| |
| @Override |
| protected void onAnimationStart() { |
| super.onAnimationStart(); |
| |
| // When this ViewGroup's animation starts, build the cache for the children |
| if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| final boolean buildCache = !isHardwareAccelerated(); |
| |
| for (int i = 0; i < count; i++) { |
| final View child = children[i]; |
| if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { |
| child.setDrawingCacheEnabled(true); |
| if (buildCache) { |
| child.buildDrawingCache(true); |
| } |
| } |
| } |
| |
| mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; |
| } |
| } |
| |
| @Override |
| protected void onAnimationEnd() { |
| super.onAnimationEnd(); |
| |
| // When this ViewGroup's animation ends, destroy the cache of the children |
| if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { |
| mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; |
| |
| if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { |
| setChildrenDrawingCacheEnabled(false); |
| } |
| } |
| } |
| |
| @Override |
| Bitmap createSnapshot(Bitmap.Config quality, int backgroundColor, boolean skipChildren) { |
| int count = mChildrenCount; |
| int[] visibilities = null; |
| |
| if (skipChildren) { |
| visibilities = new int[count]; |
| for (int i = 0; i < count; i++) { |
| View child = getChildAt(i); |
| visibilities[i] = child.getVisibility(); |
| if (visibilities[i] == View.VISIBLE) { |
| child.setVisibility(INVISIBLE); |
| } |
| } |
| } |
| |
| Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren); |
| |
| if (skipChildren) { |
| for (int i = 0; i < count; i++) { |
| getChildAt(i).setVisibility(visibilities[i]); |
| } |
| } |
| |
| return b; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected void dispatchDraw(Canvas canvas) { |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| int flags = mGroupFlags; |
| |
| if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) { |
| final boolean cache = (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; |
| |
| final boolean buildCache = !isHardwareAccelerated(); |
| for (int i = 0; i < count; i++) { |
| final View child = children[i]; |
| if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) { |
| final LayoutParams params = child.getLayoutParams(); |
| attachLayoutAnimationParameters(child, params, i, count); |
| bindLayoutAnimation(child); |
| if (cache) { |
| child.setDrawingCacheEnabled(true); |
| if (buildCache) { |
| child.buildDrawingCache(true); |
| } |
| } |
| } |
| } |
| |
| final LayoutAnimationController controller = mLayoutAnimationController; |
| if (controller.willOverlap()) { |
| mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE; |
| } |
| |
| controller.start(); |
| |
| mGroupFlags &= ~FLAG_RUN_ANIMATION; |
| mGroupFlags &= ~FLAG_ANIMATION_DONE; |
| |
| if (cache) { |
| mGroupFlags |= FLAG_CHILDREN_DRAWN_WITH_CACHE; |
| } |
| |
| if (mAnimationListener != null) { |
| mAnimationListener.onAnimationStart(controller.getAnimation()); |
| } |
| } |
| |
| int saveCount = 0; |
| final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK; |
| if (clipToPadding) { |
| saveCount = canvas.save(); |
| canvas.clipRect(mScrollX + mPaddingLeft, mScrollY + mPaddingTop, |
| mScrollX + mRight - mLeft - mPaddingRight, |
| mScrollY + mBottom - mTop - mPaddingBottom); |
| |
| } |
| |
| // We will draw our child's animation, let's reset the flag |
| mPrivateFlags &= ~DRAW_ANIMATION; |
| mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED; |
| |
| boolean more = false; |
| final long drawingTime = getDrawingTime(); |
| |
| if ((flags & FLAG_USE_CHILD_DRAWING_ORDER) == 0) { |
| for (int i = 0; i < count; i++) { |
| final View child = children[i]; |
| if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { |
| more |= drawChild(canvas, child, drawingTime); |
| } |
| } |
| } else { |
| for (int i = 0; i < count; i++) { |
| final View child = children[getChildDrawingOrder(count, i)]; |
| if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { |
| more |= drawChild(canvas, child, drawingTime); |
| } |
| } |
| } |
| |
| // Draw any disappearing views that have animations |
| if (mDisappearingChildren != null) { |
| final ArrayList<View> disappearingChildren = mDisappearingChildren; |
| final int disappearingCount = disappearingChildren.size() - 1; |
| // Go backwards -- we may delete as animations finish |
| for (int i = disappearingCount; i >= 0; i--) { |
| final View child = disappearingChildren.get(i); |
| more |= drawChild(canvas, child, drawingTime); |
| } |
| } |
| |
| if (clipToPadding) { |
| canvas.restoreToCount(saveCount); |
| } |
| |
| // mGroupFlags might have been updated by drawChild() |
| flags = mGroupFlags; |
| |
| if ((flags & FLAG_INVALIDATE_REQUIRED) == FLAG_INVALIDATE_REQUIRED) { |
| invalidate(true); |
| } |
| |
| if ((flags & FLAG_ANIMATION_DONE) == 0 && (flags & FLAG_NOTIFY_ANIMATION_LISTENER) == 0 && |
| mLayoutAnimationController.isDone() && !more) { |
| // We want to erase the drawing cache and notify the listener after the |
| // next frame is drawn because one extra invalidate() is caused by |
| // drawChild() after the animation is over |
| mGroupFlags |= FLAG_NOTIFY_ANIMATION_LISTENER; |
| final Runnable end = new Runnable() { |
| public void run() { |
| notifyAnimationListener(); |
| } |
| }; |
| post(end); |
| } |
| } |
| |
| /** |
| * Returns the index of the child to draw for this iteration. Override this |
| * if you want to change the drawing order of children. By default, it |
| * returns i. |
| * <p> |
| * NOTE: In order for this method to be called, you must enable child ordering |
| * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. |
| * |
| * @param i The current iteration. |
| * @return The index of the child to draw this iteration. |
| * |
| * @see #setChildrenDrawingOrderEnabled(boolean) |
| * @see #isChildrenDrawingOrderEnabled() |
| */ |
| protected int getChildDrawingOrder(int childCount, int i) { |
| return i; |
| } |
| |
| private void notifyAnimationListener() { |
| mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER; |
| mGroupFlags |= FLAG_ANIMATION_DONE; |
| |
| if (mAnimationListener != null) { |
| final Runnable end = new Runnable() { |
| public void run() { |
| mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation()); |
| } |
| }; |
| post(end); |
| } |
| |
| if ((mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE) { |
| mGroupFlags &= ~FLAG_CHILDREN_DRAWN_WITH_CACHE; |
| if ((mPersistentDrawingCache & PERSISTENT_ANIMATION_CACHE) == 0) { |
| setChildrenDrawingCacheEnabled(false); |
| } |
| } |
| |
| invalidate(true); |
| } |
| |
| /** |
| * This method is used to cause children of this ViewGroup to restore or recreate their |
| * display lists. It is called by getDisplayList() when the parent ViewGroup does not need |
| * to recreate its own display list, which would happen if it went through the normal |
| * draw/dispatchDraw mechanisms. |
| * |
| * @hide |
| */ |
| @Override |
| protected void dispatchGetDisplayList() { |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| final View child = children[i]; |
| if (((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) && |
| child.hasStaticLayer()) { |
| child.mRecreateDisplayList = (child.mPrivateFlags & INVALIDATED) == INVALIDATED; |
| child.mPrivateFlags &= ~INVALIDATED; |
| child.getDisplayList(); |
| child.mRecreateDisplayList = false; |
| } |
| } |
| } |
| |
| /** |
| * Draw one child of this View Group. This method is responsible for getting |
| * the canvas in the right state. This includes clipping, translating so |
| * that the child's scrolled origin is at 0, 0, and applying any animation |
| * transformations. |
| * |
| * @param canvas The canvas on which to draw the child |
| * @param child Who to draw |
| * @param drawingTime The time at which draw is occurring |
| * @return True if an invalidate() was issued |
| */ |
| protected boolean drawChild(Canvas canvas, View child, long drawingTime) { |
| return child.draw(canvas, this, drawingTime); |
| } |
| |
| /** |
| * |
| * @param enabled True if children should be drawn with layers, false otherwise. |
| * |
| * @hide |
| */ |
| public void setChildrenLayersEnabled(boolean enabled) { |
| if (enabled != mDrawLayers) { |
| mDrawLayers = enabled; |
| invalidate(true); |
| |
| boolean flushLayers = !enabled; |
| AttachInfo info = mAttachInfo; |
| if (info != null && info.mHardwareRenderer != null && |
| info.mHardwareRenderer.isEnabled()) { |
| if (!info.mHardwareRenderer.validate()) { |
| flushLayers = false; |
| } |
| } else { |
| flushLayers = false; |
| } |
| |
| // We need to invalidate any child with a layer. For instance, |
| // if a child is backed by a hardware layer and we disable layers |
| // the child is marked as not dirty (flags cleared the last time |
| // the child was drawn inside its layer.) However, that child might |
| // never have created its own display list or have an obsolete |
| // display list. By invalidating the child we ensure the display |
| // list is in sync with the content of the hardware layer. |
| for (int i = 0; i < mChildrenCount; i++) { |
| View child = mChildren[i]; |
| if (child.mLayerType != LAYER_TYPE_NONE) { |
| if (flushLayers) child.flushLayer(); |
| child.invalidate(true); |
| } |
| } |
| } |
| } |
| |
| /** |
| * By default, children are clipped to their bounds before drawing. This |
| * allows view groups to override this behavior for animations, etc. |
| * |
| * @param clipChildren true to clip children to their bounds, |
| * false otherwise |
| * @attr ref android.R.styleable#ViewGroup_clipChildren |
| */ |
| public void setClipChildren(boolean clipChildren) { |
| boolean previousValue = (mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN; |
| if (clipChildren != previousValue) { |
| setBooleanFlag(FLAG_CLIP_CHILDREN, clipChildren); |
| if (USE_DISPLAY_LIST_PROPERTIES) { |
| for (int i = 0; i < mChildrenCount; ++i) { |
| View child = getChildAt(i); |
| if (child.mDisplayList != null) { |
| child.mDisplayList.setClipChildren(clipChildren); |
| } |
| } |
| } |
| } |
| } |
| |
| /** |
| * By default, children are clipped to the padding of the ViewGroup. This |
| * allows view groups to override this behavior |
| * |
| * @param clipToPadding true to clip children to the padding of the |
| * group, false otherwise |
| * @attr ref android.R.styleable#ViewGroup_clipToPadding |
| */ |
| public void setClipToPadding(boolean clipToPadding) { |
| setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void dispatchSetSelected(boolean selected) { |
| final View[] children = mChildren; |
| final int count = mChildrenCount; |
| for (int i = 0; i < count; i++) { |
| children[i].setSelected(selected); |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void dispatchSetActivated(boolean activated) { |
| final View[] children = mChildren; |
| final int count = mChildrenCount; |
| for (int i = 0; i < count; i++) { |
| children[i].setActivated(activated); |
| } |
| } |
| |
| @Override |
| protected void dispatchSetPressed(boolean pressed) { |
| final View[] children = mChildren; |
| final int count = mChildrenCount; |
| for (int i = 0; i < count; i++) { |
| final View child = children[i]; |
| // Children that are clickable on their own should not |
| // show a pressed state when their parent view does. |
| // Clearing a pressed state always propagates. |
| if (!pressed || (!child.isClickable() && !child.isLongClickable())) { |
| child.setPressed(pressed); |
| } |
| } |
| } |
| |
| /** |
| * When this property is set to true, this ViewGroup supports static transformations on |
| * children; this causes |
| * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} to be |
| * invoked when a child is drawn. |
| * |
| * Any subclass overriding |
| * {@link #getChildStaticTransformation(View, android.view.animation.Transformation)} should |
| * set this property to true. |
| * |
| * @param enabled True to enable static transformations on children, false otherwise. |
| * |
| * @see #FLAG_SUPPORT_STATIC_TRANSFORMATIONS |
| */ |
| protected void setStaticTransformationsEnabled(boolean enabled) { |
| setBooleanFlag(FLAG_SUPPORT_STATIC_TRANSFORMATIONS, enabled); |
| } |
| |
| /** |
| * Sets <code>t</code> to be the static transformation of the child, if set, returning a |
| * boolean to indicate whether a static transform was set. The default implementation |
| * simply returns <code>false</code>; subclasses may override this method for different |
| * behavior. |
| * |
| * @param child The child view whose static transform is being requested |
| * @param t The Transformation which will hold the result |
| * @return true if the transformation was set, false otherwise |
| * @see #setStaticTransformationsEnabled(boolean) |
| */ |
| protected boolean getChildStaticTransformation(View child, Transformation t) { |
| return false; |
| } |
| |
| /** |
| * {@hide} |
| */ |
| @Override |
| protected View findViewTraversal(int id) { |
| if (id == mID) { |
| return this; |
| } |
| |
| final View[] where = mChildren; |
| final int len = mChildrenCount; |
| |
| for (int i = 0; i < len; i++) { |
| View v = where[i]; |
| |
| if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { |
| v = v.findViewById(id); |
| |
| if (v != null) { |
| return v; |
| } |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * {@hide} |
| */ |
| @Override |
| protected View findViewWithTagTraversal(Object tag) { |
| if (tag != null && tag.equals(mTag)) { |
| return this; |
| } |
| |
| final View[] where = mChildren; |
| final int len = mChildrenCount; |
| |
| for (int i = 0; i < len; i++) { |
| View v = where[i]; |
| |
| if ((v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { |
| v = v.findViewWithTag(tag); |
| |
| if (v != null) { |
| return v; |
| } |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * {@hide} |
| */ |
| @Override |
| protected View findViewByPredicateTraversal(Predicate<View> predicate, View childToSkip) { |
| if (predicate.apply(this)) { |
| return this; |
| } |
| |
| final View[] where = mChildren; |
| final int len = mChildrenCount; |
| |
| for (int i = 0; i < len; i++) { |
| View v = where[i]; |
| |
| if (v != childToSkip && (v.mPrivateFlags & IS_ROOT_NAMESPACE) == 0) { |
| v = v.findViewByPredicate(predicate); |
| |
| if (v != null) { |
| return v; |
| } |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Adds a child view. If no layout parameters are already set on the child, the |
| * default parameters for this ViewGroup are set on the child. |
| * |
| * @param child the child view to add |
| * |
| * @see #generateDefaultLayoutParams() |
| */ |
| public void addView(View child) { |
| addView(child, -1); |
| } |
| |
| /** |
| * Adds a child view. If no layout parameters are already set on the child, the |
| * default parameters for this ViewGroup are set on the child. |
| * |
| * @param child the child view to add |
| * @param index the position at which to add the child |
| * |
| * @see #generateDefaultLayoutParams() |
| */ |
| public void addView(View child, int index) { |
| LayoutParams params = child.getLayoutParams(); |
| if (params == null) { |
| params = generateDefaultLayoutParams(); |
| if (params == null) { |
| throw new IllegalArgumentException("generateDefaultLayoutParams() cannot return null"); |
| } |
| } |
| addView(child, index, params); |
| } |
| |
| /** |
| * Adds a child view with this ViewGroup's default layout parameters and the |
| * specified width and height. |
| * |
| * @param child the child view to add |
| */ |
| public void addView(View child, int width, int height) { |
| final LayoutParams params = generateDefaultLayoutParams(); |
| params.width = width; |
| params.height = height; |
| addView(child, -1, params); |
| } |
| |
| /** |
| * Adds a child view with the specified layout parameters. |
| * |
| * @param child the child view to add |
| * @param params the layout parameters to set on the child |
| */ |
| public void addView(View child, LayoutParams params) { |
| addView(child, -1, params); |
| } |
| |
| /** |
| * Adds a child view with the specified layout parameters. |
| * |
| * @param child the child view to add |
| * @param index the position at which to add the child |
| * @param params the layout parameters to set on the child |
| */ |
| public void addView(View child, int index, LayoutParams params) { |
| if (DBG) { |
| System.out.println(this + " addView"); |
| } |
| |
| // addViewInner() will call child.requestLayout() when setting the new LayoutParams |
| // therefore, we call requestLayout() on ourselves before, so that the child's request |
| // will be blocked at our level |
| requestLayout(); |
| invalidate(true); |
| addViewInner(child, index, params, false); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void updateViewLayout(View view, ViewGroup.LayoutParams params) { |
| if (!checkLayoutParams(params)) { |
| throw new IllegalArgumentException("Invalid LayoutParams supplied to " + this); |
| } |
| if (view.mParent != this) { |
| throw new IllegalArgumentException("Given view not a child of " + this); |
| } |
| view.setLayoutParams(params); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { |
| return p != null; |
| } |
| |
| /** |
| * Interface definition for a callback to be invoked when the hierarchy |
| * within this view changed. The hierarchy changes whenever a child is added |
| * to or removed from this view. |
| */ |
| public interface OnHierarchyChangeListener { |
| /** |
| * Called when a new child is added to a parent view. |
| * |
| * @param parent the view in which a child was added |
| * @param child the new child view added in the hierarchy |
| */ |
| void onChildViewAdded(View parent, View child); |
| |
| /** |
| * Called when a child is removed from a parent view. |
| * |
| * @param parent the view from which the child was removed |
| * @param child the child removed from the hierarchy |
| */ |
| void onChildViewRemoved(View parent, View child); |
| } |
| |
| /** |
| * Register a callback to be invoked when a child is added to or removed |
| * from this view. |
| * |
| * @param listener the callback to invoke on hierarchy change |
| */ |
| public void setOnHierarchyChangeListener(OnHierarchyChangeListener listener) { |
| mOnHierarchyChangeListener = listener; |
| } |
| |
| /** |
| * @hide |
| */ |
| protected void onViewAdded(View child) { |
| if (mOnHierarchyChangeListener != null) { |
| mOnHierarchyChangeListener.onChildViewAdded(this, child); |
| } |
| } |
| |
| /** |
| * @hide |
| */ |
| protected void onViewRemoved(View child) { |
| if (mOnHierarchyChangeListener != null) { |
| mOnHierarchyChangeListener.onChildViewRemoved(this, child); |
| } |
| } |
| |
| /** |
| * Adds a view during layout. This is useful if in your onLayout() method, |
| * you need to add more views (as does the list view for example). |
| * |
| * If index is negative, it means put it at the end of the list. |
| * |
| * @param child the view to add to the group |
| * @param index the index at which the child must be added |
| * @param params the layout parameters to associate with the child |
| * @return true if the child was added, false otherwise |
| */ |
| protected boolean addViewInLayout(View child, int index, LayoutParams params) { |
| return addViewInLayout(child, index, params, false); |
| } |
| |
| /** |
| * Adds a view during layout. This is useful if in your onLayout() method, |
| * you need to add more views (as does the list view for example). |
| * |
| * If index is negative, it means put it at the end of the list. |
| * |
| * @param child the view to add to the group |
| * @param index the index at which the child must be added |
| * @param params the layout parameters to associate with the child |
| * @param preventRequestLayout if true, calling this method will not trigger a |
| * layout request on child |
| * @return true if the child was added, false otherwise |
| */ |
| protected boolean addViewInLayout(View child, int index, LayoutParams params, |
| boolean preventRequestLayout) { |
| child.mParent = null; |
| addViewInner(child, index, params, preventRequestLayout); |
| child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK) | DRAWN; |
| return true; |
| } |
| |
| /** |
| * Prevents the specified child to be laid out during the next layout pass. |
| * |
| * @param child the child on which to perform the cleanup |
| */ |
| protected void cleanupLayoutState(View child) { |
| child.mPrivateFlags &= ~View.FORCE_LAYOUT; |
| } |
| |
| private void addViewInner(View child, int index, LayoutParams params, |
| boolean preventRequestLayout) { |
| |
| if (mTransition != null) { |
| // Don't prevent other add transitions from completing, but cancel remove |
| // transitions to let them complete the process before we add to the container |
| mTransition.cancel(LayoutTransition.DISAPPEARING); |
| } |
| |
| if (child.getParent() != null) { |
| throw new IllegalStateException("The specified child already has a parent. " + |
| "You must call removeView() on the child's parent first."); |
| } |
| |
| if (mTransition != null) { |
| mTransition.addChild(this, child); |
| } |
| |
| if (!checkLayoutParams(params)) { |
| params = generateLayoutParams(params); |
| } |
| |
| if (preventRequestLayout) { |
| child.mLayoutParams = params; |
| } else { |
| child.setLayoutParams(params); |
| } |
| |
| if (index < 0) { |
| index = mChildrenCount; |
| } |
| |
| addInArray(child, index); |
| |
| // tell our children |
| if (preventRequestLayout) { |
| child.assignParent(this); |
| } else { |
| child.mParent = this; |
| } |
| |
| if (child.hasFocus()) { |
| requestChildFocus(child, child.findFocus()); |
| } |
| |
| AttachInfo ai = mAttachInfo; |
| if (ai != null && (mGroupFlags & FLAG_PREVENT_DISPATCH_ATTACHED_TO_WINDOW) == 0) { |
| boolean lastKeepOn = ai.mKeepScreenOn; |
| ai.mKeepScreenOn = false; |
| child.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK)); |
| if (ai.mKeepScreenOn) { |
| needGlobalAttributesUpdate(true); |
| } |
| ai.mKeepScreenOn = lastKeepOn; |
| } |
| |
| onViewAdded(child); |
| |
| if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) { |
| mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE; |
| } |
| |
| if (child.hasTransientState()) { |
| childHasTransientStateChanged(child, true); |
| } |
| } |
| |
| private void addInArray(View child, int index) { |
| View[] children = mChildren; |
| final int count = mChildrenCount; |
| final int size = children.length; |
| if (index == count) { |
| if (size == count) { |
| mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; |
| System.arraycopy(children, 0, mChildren, 0, size); |
| children = mChildren; |
| } |
| children[mChildrenCount++] = child; |
| } else if (index < count) { |
| if (size == count) { |
| mChildren = new View[size + ARRAY_CAPACITY_INCREMENT]; |
| System.arraycopy(children, 0, mChildren, 0, index); |
| System.arraycopy(children, index, mChildren, index + 1, count - index); |
| children = mChildren; |
| } else { |
| System.arraycopy(children, index, children, index + 1, count - index); |
| } |
| children[index] = child; |
| mChildrenCount++; |
| if (mLastTouchDownIndex >= index) { |
| mLastTouchDownIndex++; |
| } |
| } else { |
| throw new IndexOutOfBoundsException("index=" + index + " count=" + count); |
| } |
| } |
| |
| // This method also sets the child's mParent to null |
| private void removeFromArray(int index) { |
| final View[] children = mChildren; |
| if (!(mTransitioningViews != null && mTransitioningViews.contains(children[index]))) { |
| children[index].mParent = null; |
| } |
| final int count = mChildrenCount; |
| if (index == count - 1) { |
| children[--mChildrenCount] = null; |
| } else if (index >= 0 && index < count) { |
| System.arraycopy(children, index + 1, children, index, count - index - 1); |
| children[--mChildrenCount] = null; |
| } else { |
| throw new IndexOutOfBoundsException(); |
| } |
| if (mLastTouchDownIndex == index) { |
| mLastTouchDownTime = 0; |
| mLastTouchDownIndex = -1; |
| } else if (mLastTouchDownIndex > index) { |
| mLastTouchDownIndex--; |
| } |
| } |
| |
| // This method also sets the children's mParent to null |
| private void removeFromArray(int start, int count) { |
| final View[] children = mChildren; |
| final int childrenCount = mChildrenCount; |
| |
| start = Math.max(0, start); |
| final int end = Math.min(childrenCount, start + count); |
| |
| if (start == end) { |
| return; |
| } |
| |
| if (end == childrenCount) { |
| for (int i = start; i < end; i++) { |
| children[i].mParent = null; |
| children[i] = null; |
| } |
| } else { |
| for (int i = start; i < end; i++) { |
| children[i].mParent = null; |
| } |
| |
| // Since we're looping above, we might as well do the copy, but is arraycopy() |
| // faster than the extra 2 bounds checks we would do in the loop? |
| System.arraycopy(children, end, children, start, childrenCount - end); |
| |
| for (int i = childrenCount - (end - start); i < childrenCount; i++) { |
| children[i] = null; |
| } |
| } |
| |
| mChildrenCount -= (end - start); |
| } |
| |
| private void bindLayoutAnimation(View child) { |
| Animation a = mLayoutAnimationController.getAnimationForView(child); |
| child.setAnimation(a); |
| } |
| |
| /** |
| * Subclasses should override this method to set layout animation |
| * parameters on the supplied child. |
| * |
| * @param child the child to associate with animation parameters |
| * @param params the child's layout parameters which hold the animation |
| * parameters |
| * @param index the index of the child in the view group |
| * @param count the number of children in the view group |
| */ |
| protected void attachLayoutAnimationParameters(View child, |
| LayoutParams params, int index, int count) { |
| LayoutAnimationController.AnimationParameters animationParams = |
| params.layoutAnimationParameters; |
| if (animationParams == null) { |
| animationParams = new LayoutAnimationController.AnimationParameters(); |
| params.layoutAnimationParameters = animationParams; |
| } |
| |
| animationParams.count = count; |
| animationParams.index = index; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void removeView(View view) { |
| removeViewInternal(view); |
| requestLayout(); |
| invalidate(true); |
| } |
| |
| /** |
| * Removes a view during layout. This is useful if in your onLayout() method, |
| * you need to remove more views. |
| * |
| * @param view the view to remove from the group |
| */ |
| public void removeViewInLayout(View view) { |
| removeViewInternal(view); |
| } |
| |
| /** |
| * Removes a range of views during layout. This is useful if in your onLayout() method, |
| * you need to remove more views. |
| * |
| * @param start the index of the first view to remove from the group |
| * @param count the number of views to remove from the group |
| */ |
| public void removeViewsInLayout(int start, int count) { |
| removeViewsInternal(start, count); |
| } |
| |
| /** |
| * Removes the view at the specified position in the group. |
| * |
| * @param index the position in the group of the view to remove |
| */ |
| public void removeViewAt(int index) { |
| removeViewInternal(index, getChildAt(index)); |
| requestLayout(); |
| invalidate(true); |
| } |
| |
| /** |
| * Removes the specified range of views from the group. |
| * |
| * @param start the first position in the group of the range of views to remove |
| * @param count the number of views to remove |
| */ |
| public void removeViews(int start, int count) { |
| removeViewsInternal(start, count); |
| requestLayout(); |
| invalidate(true); |
| } |
| |
| private void removeViewInternal(View view) { |
| final int index = indexOfChild(view); |
| if (index >= 0) { |
| removeViewInternal(index, view); |
| } |
| } |
| |
| private void removeViewInternal(int index, View view) { |
| |
| if (mTransition != null) { |
| mTransition.removeChild(this, view); |
| } |
| |
| boolean clearChildFocus = false; |
| if (view == mFocused) { |
| view.clearFocusForRemoval(); |
| clearChildFocus = true; |
| } |
| |
| if (view.getAnimation() != null || |
| (mTransitioningViews != null && mTransitioningViews.contains(view))) { |
| addDisappearingView(view); |
| } else if (view.mAttachInfo != null) { |
| view.dispatchDetachedFromWindow(); |
| } |
| |
| if (view.hasTransientState()) { |
| childHasTransientStateChanged(view, false); |
| } |
| |
| onViewRemoved(view); |
| |
| needGlobalAttributesUpdate(false); |
| |
| removeFromArray(index); |
| |
| if (clearChildFocus) { |
| clearChildFocus(view); |
| } |
| } |
| |
| /** |
| * Sets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is |
| * not null, changes in layout which occur because of children being added to or removed from |
| * the ViewGroup will be animated according to the animations defined in that LayoutTransition |
| * object. By default, the transition object is null (so layout changes are not animated). |
| * |
| * @param transition The LayoutTransition object that will animated changes in layout. A value |
| * of <code>null</code> means no transition will run on layout changes. |
| * @attr ref android.R.styleable#ViewGroup_animateLayoutChanges |
| */ |
| public void setLayoutTransition(LayoutTransition transition) { |
| if (mTransition != null) { |
| mTransition.removeTransitionListener(mLayoutTransitionListener); |
| } |
| mTransition = transition; |
| if (mTransition != null) { |
| mTransition.addTransitionListener(mLayoutTransitionListener); |
| } |
| } |
| |
| /** |
| * Gets the LayoutTransition object for this ViewGroup. If the LayoutTransition object is |
| * not null, changes in layout which occur because of children being added to or removed from |
| * the ViewGroup will be animated according to the animations defined in that LayoutTransition |
| * object. By default, the transition object is null (so layout changes are not animated). |
| * |
| * @return LayoutTranstion The LayoutTransition object that will animated changes in layout. |
| * A value of <code>null</code> means no transition will run on layout changes. |
| */ |
| public LayoutTransition getLayoutTransition() { |
| return mTransition; |
| } |
| |
| private void removeViewsInternal(int start, int count) { |
| final View focused = mFocused; |
| final boolean detach = mAttachInfo != null; |
| View clearChildFocus = null; |
| |
| final View[] children = mChildren; |
| final int end = start + count; |
| |
| for (int i = start; i < end; i++) { |
| final View view = children[i]; |
| |
| if (mTransition != null) { |
| mTransition.removeChild(this, view); |
| } |
| |
| if (view == focused) { |
| view.clearFocusForRemoval(); |
| clearChildFocus = view; |
| } |
| |
| if (view.getAnimation() != null || |
| (mTransitioningViews != null && mTransitioningViews.contains(view))) { |
| addDisappearingView(view); |
| } else if (detach) { |
| view.dispatchDetachedFromWindow(); |
| } |
| |
| if (view.hasTransientState()) { |
| childHasTransientStateChanged(view, false); |
| } |
| |
| needGlobalAttributesUpdate(false); |
| |
| onViewRemoved(view); |
| } |
| |
| removeFromArray(start, count); |
| |
| if (clearChildFocus != null) { |
| clearChildFocus(clearChildFocus); |
| } |
| } |
| |
| /** |
| * Call this method to remove all child views from the |
| * ViewGroup. |
| */ |
| public void removeAllViews() { |
| removeAllViewsInLayout(); |
| requestLayout(); |
| invalidate(true); |
| } |
| |
| /** |
| * Called by a ViewGroup subclass to remove child views from itself, |
| * when it must first know its size on screen before it can calculate how many |
| * child views it will render. An example is a Gallery or a ListView, which |
| * may "have" 50 children, but actually only render the number of children |
| * that can currently fit inside the object on screen. Do not call |
| * this method unless you are extending ViewGroup and understand the |
| * view measuring and layout pipeline. |
| */ |
| public void removeAllViewsInLayout() { |
| final int count = mChildrenCount; |
| if (count <= 0) { |
| return; |
| } |
| |
| final View[] children = mChildren; |
| mChildrenCount = 0; |
| |
| final View focused = mFocused; |
| final boolean detach = mAttachInfo != null; |
| View clearChildFocus = null; |
| |
| needGlobalAttributesUpdate(false); |
| |
| for (int i = count - 1; i >= 0; i--) { |
| final View view = children[i]; |
| |
| if (mTransition != null) { |
| mTransition.removeChild(this, view); |
| } |
| |
| if (view == focused) { |
| view.clearFocusForRemoval(); |
| clearChildFocus = view; |
| } |
| |
| if (view.getAnimation() != null || |
| (mTransitioningViews != null && mTransitioningViews.contains(view))) { |
| addDisappearingView(view); |
| } else if (detach) { |
| view.dispatchDetachedFromWindow(); |
| } |
| |
| if (view.hasTransientState()) { |
| childHasTransientStateChanged(view, false); |
| } |
| |
| onViewRemoved(view); |
| |
| view.mParent = null; |
| children[i] = null; |
| } |
| |
| if (clearChildFocus != null) { |
| clearChildFocus(clearChildFocus); |
| } |
| } |
| |
| /** |
| * Finishes the removal of a detached view. This method will dispatch the detached from |
| * window event and notify the hierarchy change listener. |
| * |
| * @param child the child to be definitely removed from the view hierarchy |
| * @param animate if true and the view has an animation, the view is placed in the |
| * disappearing views list, otherwise, it is detached from the window |
| * |
| * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) |
| * @see #detachAllViewsFromParent() |
| * @see #detachViewFromParent(View) |
| * @see #detachViewFromParent(int) |
| */ |
| protected void removeDetachedView(View child, boolean animate) { |
| if (mTransition != null) { |
| mTransition.removeChild(this, child); |
| } |
| |
| if (child == mFocused) { |
| child.clearFocus(); |
| } |
| |
| if ((animate && child.getAnimation() != null) || |
| (mTransitioningViews != null && mTransitioningViews.contains(child))) { |
| addDisappearingView(child); |
| } else if (child.mAttachInfo != null) { |
| child.dispatchDetachedFromWindow(); |
| } |
| |
| if (child.hasTransientState()) { |
| childHasTransientStateChanged(child, false); |
| } |
| |
| onViewRemoved(child); |
| } |
| |
| /** |
| * Attaches a view to this view group. Attaching a view assigns this group as the parent, |
| * sets the layout parameters and puts the view in the list of children so it can be retrieved |
| * by calling {@link #getChildAt(int)}. |
| * |
| * This method should be called only for view which were detached from their parent. |
| * |
| * @param child the child to attach |
| * @param index the index at which the child should be attached |
| * @param params the layout parameters of the child |
| * |
| * @see #removeDetachedView(View, boolean) |
| * @see #detachAllViewsFromParent() |
| * @see #detachViewFromParent(View) |
| * @see #detachViewFromParent(int) |
| */ |
| protected void attachViewToParent(View child, int index, LayoutParams params) { |
| child.mLayoutParams = params; |
| |
| if (index < 0) { |
| index = mChildrenCount; |
| } |
| |
| addInArray(child, index); |
| |
| child.mParent = this; |
| child.mPrivateFlags = (child.mPrivateFlags & ~DIRTY_MASK & ~DRAWING_CACHE_VALID) | |
| DRAWN | INVALIDATED; |
| this.mPrivateFlags |= INVALIDATED; |
| |
| if (child.hasFocus()) { |
| requestChildFocus(child, child.findFocus()); |
| } |
| } |
| |
| /** |
| * Detaches a view from its parent. Detaching a view should be temporary and followed |
| * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} |
| * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, |
| * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. |
| * |
| * @param child the child to detach |
| * |
| * @see #detachViewFromParent(int) |
| * @see #detachViewsFromParent(int, int) |
| * @see #detachAllViewsFromParent() |
| * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) |
| * @see #removeDetachedView(View, boolean) |
| */ |
| protected void detachViewFromParent(View child) { |
| removeFromArray(indexOfChild(child)); |
| } |
| |
| /** |
| * Detaches a view from its parent. Detaching a view should be temporary and followed |
| * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} |
| * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, |
| * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. |
| * |
| * @param index the index of the child to detach |
| * |
| * @see #detachViewFromParent(View) |
| * @see #detachAllViewsFromParent() |
| * @see #detachViewsFromParent(int, int) |
| * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) |
| * @see #removeDetachedView(View, boolean) |
| */ |
| protected void detachViewFromParent(int index) { |
| removeFromArray(index); |
| } |
| |
| /** |
| * Detaches a range of view from their parent. Detaching a view should be temporary and followed |
| * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} |
| * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, its |
| * parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. |
| * |
| * @param start the first index of the childrend range to detach |
| * @param count the number of children to detach |
| * |
| * @see #detachViewFromParent(View) |
| * @see #detachViewFromParent(int) |
| * @see #detachAllViewsFromParent() |
| * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) |
| * @see #removeDetachedView(View, boolean) |
| */ |
| protected void detachViewsFromParent(int start, int count) { |
| removeFromArray(start, count); |
| } |
| |
| /** |
| * Detaches all views from the parent. Detaching a view should be temporary and followed |
| * either by a call to {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)} |
| * or a call to {@link #removeDetachedView(View, boolean)}. When a view is detached, |
| * its parent is null and cannot be retrieved by a call to {@link #getChildAt(int)}. |
| * |
| * @see #detachViewFromParent(View) |
| * @see #detachViewFromParent(int) |
| * @see #detachViewsFromParent(int, int) |
| * @see #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams) |
| * @see #removeDetachedView(View, boolean) |
| */ |
| protected void detachAllViewsFromParent() { |
| final int count = mChildrenCount; |
| if (count <= 0) { |
| return; |
| } |
| |
| final View[] children = mChildren; |
| mChildrenCount = 0; |
| |
| for (int i = count - 1; i >= 0; i--) { |
| children[i].mParent = null; |
| children[i] = null; |
| } |
| } |
| |
| /** |
| * Don't call or override this method. It is used for the implementation of |
| * the view hierarchy. |
| */ |
| public final void invalidateChild(View child, final Rect dirty) { |
| if (ViewDebug.TRACE_HIERARCHY) { |
| ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD); |
| } |
| |
| ViewParent parent = this; |
| |
| final AttachInfo attachInfo = mAttachInfo; |
| if (attachInfo != null) { |
| // If the child is drawing an animation, we want to copy this flag onto |
| // ourselves and the parent to make sure the invalidate request goes |
| // through |
| final boolean drawAnimation = (child.mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION; |
| |
| //noinspection PointlessBooleanExpression |
| if (!HardwareRenderer.RENDER_DIRTY_REGIONS) { |
| if (dirty == null) { |
| if (child.mLayerType != LAYER_TYPE_NONE) { |
| mPrivateFlags |= INVALIDATED; |
| mPrivateFlags &= ~DRAWING_CACHE_VALID; |
| child.mLocalDirtyRect.setEmpty(); |
| } |
| do { |
| View view = null; |
| if (parent instanceof View) { |
| view = (View) parent; |
| if (view.mLayerType != LAYER_TYPE_NONE) { |
| view.mLocalDirtyRect.setEmpty(); |
| if (view.getParent() instanceof View) { |
| final View grandParent = (View) view.getParent(); |
| grandParent.mPrivateFlags |= INVALIDATED; |
| grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; |
| } |
| } |
| if ((view.mPrivateFlags & DIRTY_MASK) != 0) { |
| // already marked dirty - we're done |
| break; |
| } |
| } |
| |
| if (drawAnimation) { |
| if (view != null) { |
| view.mPrivateFlags |= DRAW_ANIMATION; |
| } else if (parent instanceof ViewRootImpl) { |
| ((ViewRootImpl) parent).mIsAnimating = true; |
| } |
| } |
| |
| if (parent instanceof ViewRootImpl) { |
| ((ViewRootImpl) parent).invalidate(); |
| parent = null; |
| } else if (view != null) { |
| if ((view.mPrivateFlags & DRAWN) == DRAWN || |
| (view.mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { |
| view.mPrivateFlags &= ~DRAWING_CACHE_VALID; |
| view.mPrivateFlags |= DIRTY; |
| parent = view.mParent; |
| } else { |
| parent = null; |
| } |
| } |
| } while (parent != null); |
| } |
| |
| return; |
| } |
| |
| // Check whether the child that requests the invalidate is fully opaque |
| // Views being animated or transformed are not considered opaque because we may |
| // be invalidating their old position and need the parent to paint behind them. |
| Matrix childMatrix = child.getMatrix(); |
| final boolean isOpaque = child.isOpaque() && !drawAnimation && |
| child.getAnimation() == null && childMatrix.isIdentity(); |
| // Mark the child as dirty, using the appropriate flag |
| // Make sure we do not set both flags at the same time |
| int opaqueFlag = isOpaque ? DIRTY_OPAQUE : DIRTY; |
| |
| if (child.mLayerType != LAYER_TYPE_NONE) { |
| mPrivateFlags |= INVALIDATED; |
| mPrivateFlags &= ~DRAWING_CACHE_VALID; |
| child.mLocalDirtyRect.union(dirty); |
| } |
| |
| final int[] location = attachInfo.mInvalidateChildLocation; |
| location[CHILD_LEFT_INDEX] = child.mLeft; |
| location[CHILD_TOP_INDEX] = child.mTop; |
| if (!childMatrix.isIdentity()) { |
| RectF boundingRect = attachInfo.mTmpTransformRect; |
| boundingRect.set(dirty); |
| //boundingRect.inset(-0.5f, -0.5f); |
| childMatrix.mapRect(boundingRect); |
| dirty.set((int) (boundingRect.left - 0.5f), |
| (int) (boundingRect.top - 0.5f), |
| (int) (boundingRect.right + 0.5f), |
| (int) (boundingRect.bottom + 0.5f)); |
| } |
| |
| do { |
| View view = null; |
| if (parent instanceof View) { |
| view = (View) parent; |
| if (view.mLayerType != LAYER_TYPE_NONE && |
| view.getParent() instanceof View) { |
| final View grandParent = (View) view.getParent(); |
| grandParent.mPrivateFlags |= INVALIDATED; |
| grandParent.mPrivateFlags &= ~DRAWING_CACHE_VALID; |
| } |
| } |
| |
| if (drawAnimation) { |
| if (view != null) { |
| view.mPrivateFlags |= DRAW_ANIMATION; |
| } else if (parent instanceof ViewRootImpl) { |
| ((ViewRootImpl) parent).mIsAnimating = true; |
| } |
| } |
| |
| // If the parent is dirty opaque or not dirty, mark it dirty with the opaque |
| // flag coming from the child that initiated the invalidate |
| if (view != null) { |
| if ((view.mViewFlags & FADING_EDGE_MASK) != 0 && |
| view.getSolidColor() == 0) { |
| opaqueFlag = DIRTY; |
| } |
| if ((view.mPrivateFlags & DIRTY_MASK) != DIRTY) { |
| view.mPrivateFlags = (view.mPrivateFlags & ~DIRTY_MASK) | opaqueFlag; |
| } |
| } |
| |
| parent = parent.invalidateChildInParent(location, dirty); |
| if (view != null) { |
| // Account for transform on current parent |
| Matrix m = view.getMatrix(); |
| if (!m.isIdentity()) { |
| RectF boundingRect = attachInfo.mTmpTransformRect; |
| boundingRect.set(dirty); |
| m.mapRect(boundingRect); |
| dirty.set((int) (boundingRect.left - 0.5f), |
| (int) (boundingRect.top - 0.5f), |
| (int) (boundingRect.right + 0.5f), |
| (int) (boundingRect.bottom + 0.5f)); |
| } |
| } |
| } while (parent != null); |
| } |
| } |
| |
| /** |
| * Don't call or override this method. It is used for the implementation of |
| * the view hierarchy. |
| * |
| * This implementation returns null if this ViewGroup does not have a parent, |
| * if this ViewGroup is already fully invalidated or if the dirty rectangle |
| * does not intersect with this ViewGroup's bounds. |
| */ |
| public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) { |
| if (ViewDebug.TRACE_HIERARCHY) { |
| ViewDebug.trace(this, ViewDebug.HierarchyTraceType.INVALIDATE_CHILD_IN_PARENT); |
| } |
| |
| if ((mPrivateFlags & DRAWN) == DRAWN || |
| (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { |
| if ((mGroupFlags & (FLAG_OPTIMIZE_INVALIDATE | FLAG_ANIMATION_DONE)) != |
| FLAG_OPTIMIZE_INVALIDATE) { |
| dirty.offset(location[CHILD_LEFT_INDEX] - mScrollX, |
| location[CHILD_TOP_INDEX] - mScrollY); |
| |
| final int left = mLeft; |
| final int top = mTop; |
| |
| if ((mGroupFlags & FLAG_CLIP_CHILDREN) != FLAG_CLIP_CHILDREN || |
| dirty.intersect(0, 0, mRight - left, mBottom - top) || |
| (mPrivateFlags & DRAW_ANIMATION) == DRAW_ANIMATION) { |
| mPrivateFlags &= ~DRAWING_CACHE_VALID; |
| |
| location[CHILD_LEFT_INDEX] = left; |
| location[CHILD_TOP_INDEX] = top; |
| |
| if (mLayerType != LAYER_TYPE_NONE) { |
| mLocalDirtyRect.union(dirty); |
| } |
| |
| return mParent; |
| } |
| } else { |
| mPrivateFlags &= ~DRAWN & ~DRAWING_CACHE_VALID; |
| |
| location[CHILD_LEFT_INDEX] = mLeft; |
| location[CHILD_TOP_INDEX] = mTop; |
| if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) { |
| dirty.set(0, 0, mRight - mLeft, mBottom - mTop); |
| } else { |
| // in case the dirty rect extends outside the bounds of this container |
| dirty.union(0, 0, mRight - mLeft, mBottom - mTop); |
| } |
| |
| if (mLayerType != LAYER_TYPE_NONE) { |
| mLocalDirtyRect.union(dirty); |
| } |
| |
| return mParent; |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Quick invalidation method called by View.invalidateViewProperty. This doesn't set the |
| * DRAWN flags and doesn't handle the Animation logic that the default invalidation methods |
| * do; all we want to do here is schedule a traversal with the appropriate dirty rect. |
| * |
| * @hide |
| */ |
| public void invalidateChildFast(View child, final Rect dirty) { |
| ViewParent parent = this; |
| |
| final AttachInfo attachInfo = mAttachInfo; |
| if (attachInfo != null) { |
| if (child.mLayerType != LAYER_TYPE_NONE) { |
| child.mLocalDirtyRect.union(dirty); |
| } |
| |
| int left = child.mLeft; |
| int top = child.mTop; |
| if (!child.getMatrix().isIdentity()) { |
| child.transformRect(dirty); |
| } |
| |
| do { |
| if (parent instanceof ViewGroup) { |
| ViewGroup parentVG = (ViewGroup) parent; |
| parent = parentVG.invalidateChildInParentFast(left, top, dirty); |
| left = parentVG.mLeft; |
| top = parentVG.mTop; |
| } else { |
| // Reached the top; this calls into the usual invalidate method in |
| // ViewRootImpl, which schedules a traversal |
| final int[] location = attachInfo.mInvalidateChildLocation; |
| location[0] = left; |
| location[1] = top; |
| parent = parent.invalidateChildInParent(location, dirty); |
| } |
| } while (parent != null); |
| } |
| } |
| |
| /** |
| * Quick invalidation method that simply transforms the dirty rect into the parent's |
| * coordinate system, pruning the invalidation if the parent has already been invalidated. |
| */ |
| private ViewParent invalidateChildInParentFast(int left, int top, final Rect dirty) { |
| if ((mPrivateFlags & DRAWN) == DRAWN || |
| (mPrivateFlags & DRAWING_CACHE_VALID) == DRAWING_CACHE_VALID) { |
| dirty.offset(left - mScrollX, top - mScrollY); |
| |
| if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0 || |
| dirty.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { |
| |
| if (mLayerType != LAYER_TYPE_NONE) { |
| mLocalDirtyRect.union(dirty); |
| } |
| if (!getMatrix().isIdentity()) { |
| transformRect(dirty); |
| } |
| |
| return mParent; |
| } |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Offset a rectangle that is in a descendant's coordinate |
| * space into our coordinate space. |
| * @param descendant A descendant of this view |
| * @param rect A rectangle defined in descendant's coordinate space. |
| */ |
| public final void offsetDescendantRectToMyCoords(View descendant, Rect rect) { |
| offsetRectBetweenParentAndChild(descendant, rect, true, false); |
| } |
| |
| /** |
| * Offset a rectangle that is in our coordinate space into an ancestor's |
| * coordinate space. |
| * @param descendant A descendant of this view |
| * @param rect A rectangle defined in descendant's coordinate space. |
| */ |
| public final void offsetRectIntoDescendantCoords(View descendant, Rect rect) { |
| offsetRectBetweenParentAndChild(descendant, rect, false, false); |
| } |
| |
| /** |
| * Helper method that offsets a rect either from parent to descendant or |
| * descendant to parent. |
| */ |
| void offsetRectBetweenParentAndChild(View descendant, Rect rect, |
| boolean offsetFromChildToParent, boolean clipToBounds) { |
| |
| // already in the same coord system :) |
| if (descendant == this) { |
| return; |
| } |
| |
| ViewParent theParent = descendant.mParent; |
| |
| // search and offset up to the parent |
| while ((theParent != null) |
| && (theParent instanceof View) |
| && (theParent != this)) { |
| |
| if (offsetFromChildToParent) { |
| rect.offset(descendant.mLeft - descendant.mScrollX, |
| descendant.mTop - descendant.mScrollY); |
| if (clipToBounds) { |
| View p = (View) theParent; |
| rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); |
| } |
| } else { |
| if (clipToBounds) { |
| View p = (View) theParent; |
| rect.intersect(0, 0, p.mRight - p.mLeft, p.mBottom - p.mTop); |
| } |
| rect.offset(descendant.mScrollX - descendant.mLeft, |
| descendant.mScrollY - descendant.mTop); |
| } |
| |
| descendant = (View) theParent; |
| theParent = descendant.mParent; |
| } |
| |
| // now that we are up to this view, need to offset one more time |
| // to get into our coordinate space |
| if (theParent == this) { |
| if (offsetFromChildToParent) { |
| rect.offset(descendant.mLeft - descendant.mScrollX, |
| descendant.mTop - descendant.mScrollY); |
| } else { |
| rect.offset(descendant.mScrollX - descendant.mLeft, |
| descendant.mScrollY - descendant.mTop); |
| } |
| } else { |
| throw new IllegalArgumentException("parameter must be a descendant of this view"); |
| } |
| } |
| |
| /** |
| * Offset the vertical location of all children of this view by the specified number of pixels. |
| * |
| * @param offset the number of pixels to offset |
| * |
| * @hide |
| */ |
| public void offsetChildrenTopAndBottom(int offset) { |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| |
| for (int i = 0; i < count; i++) { |
| final View v = children[i]; |
| v.mTop += offset; |
| v.mBottom += offset; |
| if (USE_DISPLAY_LIST_PROPERTIES && v.mDisplayList != null) { |
| v.mDisplayList.offsetTopBottom(offset); |
| invalidateViewProperty(false, false); |
| } |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) { |
| // It doesn't make a whole lot of sense to call this on a view that isn't attached, |
| // but for some simple tests it can be useful. If we don't have attach info this |
| // will allocate memory. |
| final RectF rect = mAttachInfo != null ? mAttachInfo.mTmpTransformRect : new RectF(); |
| rect.set(r); |
| |
| if (!child.hasIdentityMatrix()) { |
| child.getMatrix().mapRect(rect); |
| } |
| |
| int dx = child.mLeft - mScrollX; |
| int dy = child.mTop - mScrollY; |
| |
| rect.offset(dx, dy); |
| |
| if (offset != null) { |
| if (!child.hasIdentityMatrix()) { |
| float[] position = mAttachInfo != null ? mAttachInfo.mTmpTransformLocation |
| : new float[2]; |
| position[0] = offset.x; |
| position[1] = offset.y; |
| child.getMatrix().mapPoints(position); |
| offset.x = (int) (position[0] + 0.5f); |
| offset.y = (int) (position[1] + 0.5f); |
| } |
| offset.x += dx; |
| offset.y += dy; |
| } |
| |
| if (rect.intersect(0, 0, mRight - mLeft, mBottom - mTop)) { |
| if (mParent == null) return true; |
| r.set((int) (rect.left + 0.5f), (int) (rect.top + 0.5f), |
| (int) (rect.right + 0.5f), (int) (rect.bottom + 0.5f)); |
| return mParent.getChildVisibleRect(this, r, offset); |
| } |
| |
| return false; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public final void layout(int l, int t, int r, int b) { |
| if (mTransition == null || !mTransition.isChangingLayout()) { |
| super.layout(l, t, r, b); |
| } else { |
| // record the fact that we noop'd it; request layout when transition finishes |
| mLayoutSuppressed = true; |
| } |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected abstract void onLayout(boolean changed, |
| int l, int t, int r, int b); |
| |
| /** |
| * Indicates whether the view group has the ability to animate its children |
| * after the first layout. |
| * |
| * @return true if the children can be animated, false otherwise |
| */ |
| protected boolean canAnimate() { |
| return mLayoutAnimationController != null; |
| } |
| |
| /** |
| * Runs the layout animation. Calling this method triggers a relayout of |
| * this view group. |
| */ |
| public void startLayoutAnimation() { |
| if (mLayoutAnimationController != null) { |
| mGroupFlags |= FLAG_RUN_ANIMATION; |
| requestLayout(); |
| } |
| } |
| |
| /** |
| * Schedules the layout animation to be played after the next layout pass |
| * of this view group. This can be used to restart the layout animation |
| * when the content of the view group changes or when the activity is |
| * paused and resumed. |
| */ |
| public void scheduleLayoutAnimation() { |
| mGroupFlags |= FLAG_RUN_ANIMATION; |
| } |
| |
| /** |
| * Sets the layout animation controller used to animate the group's |
| * children after the first layout. |
| * |
| * @param controller the animation controller |
| */ |
| public void setLayoutAnimation(LayoutAnimationController controller) { |
| mLayoutAnimationController = controller; |
| if (mLayoutAnimationController != null) { |
| mGroupFlags |= FLAG_RUN_ANIMATION; |
| } |
| } |
| |
| /** |
| * Returns the layout animation controller used to animate the group's |
| * children. |
| * |
| * @return the current animation controller |
| */ |
| public LayoutAnimationController getLayoutAnimation() { |
| return mLayoutAnimationController; |
| } |
| |
| /** |
| * Indicates whether the children's drawing cache is used during a layout |
| * animation. By default, the drawing cache is enabled but this will prevent |
| * nested layout animations from working. To nest animations, you must disable |
| * the cache. |
| * |
| * @return true if the animation cache is enabled, false otherwise |
| * |
| * @see #setAnimationCacheEnabled(boolean) |
| * @see View#setDrawingCacheEnabled(boolean) |
| */ |
| @ViewDebug.ExportedProperty |
| public boolean isAnimationCacheEnabled() { |
| return (mGroupFlags & FLAG_ANIMATION_CACHE) == FLAG_ANIMATION_CACHE; |
| } |
| |
| /** |
| * Enables or disables the children's drawing cache during a layout animation. |
| * By default, the drawing cache is enabled but this will prevent nested |
| * layout animations from working. To nest animations, you must disable the |
| * cache. |
| * |
| * @param enabled true to enable the animation cache, false otherwise |
| * |
| * @see #isAnimationCacheEnabled() |
| * @see View#setDrawingCacheEnabled(boolean) |
| */ |
| public void setAnimationCacheEnabled(boolean enabled) { |
| setBooleanFlag(FLAG_ANIMATION_CACHE, enabled); |
| } |
| |
| /** |
| * Indicates whether this ViewGroup will always try to draw its children using their |
| * drawing cache. By default this property is enabled. |
| * |
| * @return true if the animation cache is enabled, false otherwise |
| * |
| * @see #setAlwaysDrawnWithCacheEnabled(boolean) |
| * @see #setChildrenDrawnWithCacheEnabled(boolean) |
| * @see View#setDrawingCacheEnabled(boolean) |
| */ |
| @ViewDebug.ExportedProperty(category = "drawing") |
| public boolean isAlwaysDrawnWithCacheEnabled() { |
| return (mGroupFlags & FLAG_ALWAYS_DRAWN_WITH_CACHE) == FLAG_ALWAYS_DRAWN_WITH_CACHE; |
| } |
| |
| /** |
| * Indicates whether this ViewGroup will always try to draw its children using their |
| * drawing cache. This property can be set to true when the cache rendering is |
| * slightly different from the children's normal rendering. Renderings can be different, |
| * for instance, when the cache's quality is set to low. |
| * |
| * When this property is disabled, the ViewGroup will use the drawing cache of its |
| * children only when asked to. It's usually the task of subclasses to tell ViewGroup |
| * when to start using the drawing cache and when to stop using it. |
| * |
| * @param always true to always draw with the drawing cache, false otherwise |
| * |
| * @see #isAlwaysDrawnWithCacheEnabled() |
| * @see #setChildrenDrawnWithCacheEnabled(boolean) |
| * @see View#setDrawingCacheEnabled(boolean) |
| * @see View#setDrawingCacheQuality(int) |
| */ |
| public void setAlwaysDrawnWithCacheEnabled(boolean always) { |
| setBooleanFlag(FLAG_ALWAYS_DRAWN_WITH_CACHE, always); |
| } |
| |
| /** |
| * Indicates whether the ViewGroup is currently drawing its children using |
| * their drawing cache. |
| * |
| * @return true if children should be drawn with their cache, false otherwise |
| * |
| * @see #setAlwaysDrawnWithCacheEnabled(boolean) |
| * @see #setChildrenDrawnWithCacheEnabled(boolean) |
| */ |
| @ViewDebug.ExportedProperty(category = "drawing") |
| protected boolean isChildrenDrawnWithCacheEnabled() { |
| return (mGroupFlags & FLAG_CHILDREN_DRAWN_WITH_CACHE) == FLAG_CHILDREN_DRAWN_WITH_CACHE; |
| } |
| |
| /** |
| * Tells the ViewGroup to draw its children using their drawing cache. This property |
| * is ignored when {@link #isAlwaysDrawnWithCacheEnabled()} is true. A child's drawing cache |
| * will be used only if it has been enabled. |
| * |
| * Subclasses should call this method to start and stop using the drawing cache when |
| * they perform performance sensitive operations, like scrolling or animating. |
| * |
| * @param enabled true if children should be drawn with their cache, false otherwise |
| * |
| * @see #setAlwaysDrawnWithCacheEnabled(boolean) |
| * @see #isChildrenDrawnWithCacheEnabled() |
| */ |
| protected void setChildrenDrawnWithCacheEnabled(boolean enabled) { |
| setBooleanFlag(FLAG_CHILDREN_DRAWN_WITH_CACHE, enabled); |
| } |
| |
| /** |
| * Indicates whether the ViewGroup is drawing its children in the order defined by |
| * {@link #getChildDrawingOrder(int, int)}. |
| * |
| * @return true if children drawing order is defined by {@link #getChildDrawingOrder(int, int)}, |
| * false otherwise |
| * |
| * @see #setChildrenDrawingOrderEnabled(boolean) |
| * @see #getChildDrawingOrder(int, int) |
| */ |
| @ViewDebug.ExportedProperty(category = "drawing") |
| protected boolean isChildrenDrawingOrderEnabled() { |
| return (mGroupFlags & FLAG_USE_CHILD_DRAWING_ORDER) == FLAG_USE_CHILD_DRAWING_ORDER; |
| } |
| |
| /** |
| * Tells the ViewGroup whether to draw its children in the order defined by the method |
| * {@link #getChildDrawingOrder(int, int)}. |
| * |
| * @param enabled true if the order of the children when drawing is determined by |
| * {@link #getChildDrawingOrder(int, int)}, false otherwise |
| * |
| * @see #isChildrenDrawingOrderEnabled() |
| * @see #getChildDrawingOrder(int, int) |
| */ |
| protected void setChildrenDrawingOrderEnabled(boolean enabled) { |
| setBooleanFlag(FLAG_USE_CHILD_DRAWING_ORDER, enabled); |
| } |
| |
| private void setBooleanFlag(int flag, boolean value) { |
| if (value) { |
| mGroupFlags |= flag; |
| } else { |
| mGroupFlags &= ~flag; |
| } |
| } |
| |
| /** |
| * Returns an integer indicating what types of drawing caches are kept in memory. |
| * |
| * @see #setPersistentDrawingCache(int) |
| * @see #setAnimationCacheEnabled(boolean) |
| * |
| * @return one or a combination of {@link #PERSISTENT_NO_CACHE}, |
| * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} |
| * and {@link #PERSISTENT_ALL_CACHES} |
| */ |
| @ViewDebug.ExportedProperty(category = "drawing", mapping = { |
| @ViewDebug.IntToString(from = PERSISTENT_NO_CACHE, to = "NONE"), |
| @ViewDebug.IntToString(from = PERSISTENT_ANIMATION_CACHE, to = "ANIMATION"), |
| @ViewDebug.IntToString(from = PERSISTENT_SCROLLING_CACHE, to = "SCROLLING"), |
| @ViewDebug.IntToString(from = PERSISTENT_ALL_CACHES, to = "ALL") |
| }) |
| public int getPersistentDrawingCache() { |
| return mPersistentDrawingCache; |
| } |
| |
| /** |
| * Indicates what types of drawing caches should be kept in memory after |
| * they have been created. |
| * |
| * @see #getPersistentDrawingCache() |
| * @see #setAnimationCacheEnabled(boolean) |
| * |
| * @param drawingCacheToKeep one or a combination of {@link #PERSISTENT_NO_CACHE}, |
| * {@link #PERSISTENT_ANIMATION_CACHE}, {@link #PERSISTENT_SCROLLING_CACHE} |
| * and {@link #PERSISTENT_ALL_CACHES} |
| */ |
| public void setPersistentDrawingCache(int drawingCacheToKeep) { |
| mPersistentDrawingCache = drawingCacheToKeep & PERSISTENT_ALL_CACHES; |
| } |
| |
| /** |
| * Returns a new set of layout parameters based on the supplied attributes set. |
| * |
| * @param attrs the attributes to build the layout parameters from |
| * |
| * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one |
| * of its descendants |
| */ |
| public LayoutParams generateLayoutParams(AttributeSet attrs) { |
| return new LayoutParams(getContext(), attrs); |
| } |
| |
| /** |
| * Returns a safe set of layout parameters based on the supplied layout params. |
| * When a ViewGroup is passed a View whose layout params do not pass the test of |
| * {@link #checkLayoutParams(android.view.ViewGroup.LayoutParams)}, this method |
| * is invoked. This method should return a new set of layout params suitable for |
| * this ViewGroup, possibly by copying the appropriate attributes from the |
| * specified set of layout params. |
| * |
| * @param p The layout parameters to convert into a suitable set of layout parameters |
| * for this ViewGroup. |
| * |
| * @return an instance of {@link android.view.ViewGroup.LayoutParams} or one |
| * of its descendants |
| */ |
| protected LayoutParams generateLayoutParams(ViewGroup.LayoutParams p) { |
| return p; |
| } |
| |
| /** |
| * Returns a set of default layout parameters. These parameters are requested |
| * when the View passed to {@link #addView(View)} has no layout parameters |
| * already set. If null is returned, an exception is thrown from addView. |
| * |
| * @return a set of default layout parameters or null |
| */ |
| protected LayoutParams generateDefaultLayoutParams() { |
| return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); |
| } |
| |
| /** |
| * @hide |
| */ |
| @Override |
| protected boolean dispatchConsistencyCheck(int consistency) { |
| boolean result = super.dispatchConsistencyCheck(consistency); |
| |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| if (!children[i].dispatchConsistencyCheck(consistency)) result = false; |
| } |
| |
| return result; |
| } |
| |
| /** |
| * @hide |
| */ |
| @Override |
| protected boolean onConsistencyCheck(int consistency) { |
| boolean result = super.onConsistencyCheck(consistency); |
| |
| final boolean checkLayout = (consistency & ViewDebug.CONSISTENCY_LAYOUT) != 0; |
| final boolean checkDrawing = (consistency & ViewDebug.CONSISTENCY_DRAWING) != 0; |
| |
| if (checkLayout) { |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| if (children[i].getParent() != this) { |
| result = false; |
| android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, |
| "View " + children[i] + " has no parent/a parent that is not " + this); |
| } |
| } |
| } |
| |
| if (checkDrawing) { |
| // If this group is dirty, check that the parent is dirty as well |
| if ((mPrivateFlags & DIRTY_MASK) != 0) { |
| final ViewParent parent = getParent(); |
| if (parent != null && !(parent instanceof ViewRootImpl)) { |
| if ((((View) parent).mPrivateFlags & DIRTY_MASK) == 0) { |
| result = false; |
| android.util.Log.d(ViewDebug.CONSISTENCY_LOG_TAG, |
| "ViewGroup " + this + " is dirty but its parent is not: " + this); |
| } |
| } |
| } |
| } |
| |
| return result; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| protected void debug(int depth) { |
| super.debug(depth); |
| String output; |
| |
| if (mFocused != null) { |
| output = debugIndent(depth); |
| output += "mFocused"; |
| Log.d(VIEW_LOG_TAG, output); |
| } |
| if (mChildrenCount != 0) { |
| output = debugIndent(depth); |
| output += "{"; |
| Log.d(VIEW_LOG_TAG, output); |
| } |
| int count = mChildrenCount; |
| for (int i = 0; i < count; i++) { |
| View child = mChildren[i]; |
| child.debug(depth + 1); |
| } |
| |
| if (mChildrenCount != 0) { |
| output = debugIndent(depth); |
| output += "}"; |
| Log.d(VIEW_LOG_TAG, output); |
| } |
| } |
| |
| /** |
| * Returns the position in the group of the specified child view. |
| * |
| * @param child the view for which to get the position |
| * @return a positive integer representing the position of the view in the |
| * group, or -1 if the view does not exist in the group |
| */ |
| public int indexOfChild(View child) { |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| if (children[i] == child) { |
| return i; |
| } |
| } |
| return -1; |
| } |
| |
| /** |
| * Returns the number of children in the group. |
| * |
| * @return a positive integer representing the number of children in |
| * the group |
| */ |
| public int getChildCount() { |
| return mChildrenCount; |
| } |
| |
| /** |
| * Returns the view at the specified position in the group. |
| * |
| * @param index the position at which to get the view from |
| * @return the view at the specified position or null if the position |
| * does not exist within the group |
| */ |
| public View getChildAt(int index) { |
| if (index < 0 || index >= mChildrenCount) { |
| return null; |
| } |
| return mChildren[index]; |
| } |
| |
| /** |
| * Ask all of the children of this view to measure themselves, taking into |
| * account both the MeasureSpec requirements for this view and its padding. |
| * We skip children that are in the GONE state The heavy lifting is done in |
| * getChildMeasureSpec. |
| * |
| * @param widthMeasureSpec The width requirements for this view |
| * @param heightMeasureSpec The height requirements for this view |
| */ |
| protected void measureChildren(int widthMeasureSpec, int heightMeasureSpec) { |
| final int size = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < size; ++i) { |
| final View child = children[i]; |
| if ((child.mViewFlags & VISIBILITY_MASK) != GONE) { |
| measureChild(child, widthMeasureSpec, heightMeasureSpec); |
| } |
| } |
| } |
| |
| /** |
| * Ask one of the children of this view to measure itself, taking into |
| * account both the MeasureSpec requirements for this view and its padding. |
| * The heavy lifting is done in getChildMeasureSpec. |
| * |
| * @param child The child to measure |
| * @param parentWidthMeasureSpec The width requirements for this view |
| * @param parentHeightMeasureSpec The height requirements for this view |
| */ |
| protected void measureChild(View child, int parentWidthMeasureSpec, |
| int parentHeightMeasureSpec) { |
| final LayoutParams lp = child.getLayoutParams(); |
| |
| final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, |
| mPaddingLeft + mPaddingRight, lp.width); |
| final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, |
| mPaddingTop + mPaddingBottom, lp.height); |
| |
| child.measure(childWidthMeasureSpec, childHeightMeasureSpec); |
| } |
| |
| /** |
| * Ask one of the children of this view to measure itself, taking into |
| * account both the MeasureSpec requirements for this view and its padding |
| * and margins. The child must have MarginLayoutParams The heavy lifting is |
| * done in getChildMeasureSpec. |
| * |
| * @param child The child to measure |
| * @param parentWidthMeasureSpec The width requirements for this view |
| * @param widthUsed Extra space that has been used up by the parent |
| * horizontally (possibly by other children of the parent) |
| * @param parentHeightMeasureSpec The height requirements for this view |
| * @param heightUsed Extra space that has been used up by the parent |
| * vertically (possibly by other children of the parent) |
| */ |
| protected void measureChildWithMargins(View child, |
| int parentWidthMeasureSpec, int widthUsed, |
| int parentHeightMeasureSpec, int heightUsed) { |
| final MarginLayoutParams lp = (MarginLayoutParams) child.getLayoutParams(); |
| |
| final int childWidthMeasureSpec = getChildMeasureSpec(parentWidthMeasureSpec, |
| mPaddingLeft + mPaddingRight + lp.leftMargin + lp.rightMargin |
| + widthUsed, lp.width); |
| final int childHeightMeasureSpec = getChildMeasureSpec(parentHeightMeasureSpec, |
| mPaddingTop + mPaddingBottom + lp.topMargin + lp.bottomMargin |
| + heightUsed, lp.height); |
| |
| child.measure(childWidthMeasureSpec, childHeightMeasureSpec); |
| } |
| |
| /** |
| * Does the hard part of measureChildren: figuring out the MeasureSpec to |
| * pass to a particular child. This method figures out the right MeasureSpec |
| * for one dimension (height or width) of one child view. |
| * |
| * The goal is to combine information from our MeasureSpec with the |
| * LayoutParams of the child to get the best possible results. For example, |
| * if the this view knows its size (because its MeasureSpec has a mode of |
| * EXACTLY), and the child has indicated in its LayoutParams that it wants |
| * to be the same size as the parent, the parent should ask the child to |
| * layout given an exact size. |
| * |
| * @param spec The requirements for this view |
| * @param padding The padding of this view for the current dimension and |
| * margins, if applicable |
| * @param childDimension How big the child wants to be in the current |
| * dimension |
| * @return a MeasureSpec integer for the child |
| */ |
| public static int getChildMeasureSpec(int spec, int padding, int childDimension) { |
| int specMode = MeasureSpec.getMode(spec); |
| int specSize = MeasureSpec.getSize(spec); |
| |
| int size = Math.max(0, specSize - padding); |
| |
| int resultSize = 0; |
| int resultMode = 0; |
| |
| switch (specMode) { |
| // Parent has imposed an exact size on us |
| case MeasureSpec.EXACTLY: |
| if (childDimension >= 0) { |
| resultSize = childDimension; |
| resultMode = MeasureSpec.EXACTLY; |
| } else if (childDimension == LayoutParams.MATCH_PARENT) { |
| // Child wants to be our size. So be it. |
| resultSize = size; |
| resultMode = MeasureSpec.EXACTLY; |
| } else if (childDimension == LayoutParams.WRAP_CONTENT) { |
| // Child wants to determine its own size. It can't be |
| // bigger than us. |
| resultSize = size; |
| resultMode = MeasureSpec.AT_MOST; |
| } |
| break; |
| |
| // Parent has imposed a maximum size on us |
| case MeasureSpec.AT_MOST: |
| if (childDimension >= 0) { |
| // Child wants a specific size... so be it |
| resultSize = childDimension; |
| resultMode = MeasureSpec.EXACTLY; |
| } else if (childDimension == LayoutParams.MATCH_PARENT) { |
| // Child wants to be our size, but our size is not fixed. |
| // Constrain child to not be bigger than us. |
| resultSize = size; |
| resultMode = MeasureSpec.AT_MOST; |
| } else if (childDimension == LayoutParams.WRAP_CONTENT) { |
| // Child wants to determine its own size. It can't be |
| // bigger than us. |
| resultSize = size; |
| resultMode = MeasureSpec.AT_MOST; |
| } |
| break; |
| |
| // Parent asked to see how big we want to be |
| case MeasureSpec.UNSPECIFIED: |
| if (childDimension >= 0) { |
| // Child wants a specific size... let him have it |
| resultSize = childDimension; |
| resultMode = MeasureSpec.EXACTLY; |
| } else if (childDimension == LayoutParams.MATCH_PARENT) { |
| // Child wants to be our size... find out how big it should |
| // be |
| resultSize = 0; |
| resultMode = MeasureSpec.UNSPECIFIED; |
| } else if (childDimension == LayoutParams.WRAP_CONTENT) { |
| // Child wants to determine its own size.... find out how |
| // big it should be |
| resultSize = 0; |
| resultMode = MeasureSpec.UNSPECIFIED; |
| } |
| break; |
| } |
| return MeasureSpec.makeMeasureSpec(resultSize, resultMode); |
| } |
| |
| |
| /** |
| * Removes any pending animations for views that have been removed. Call |
| * this if you don't want animations for exiting views to stack up. |
| */ |
| public void clearDisappearingChildren() { |
| if (mDisappearingChildren != null) { |
| mDisappearingChildren.clear(); |
| } |
| } |
| |
| /** |
| * Add a view which is removed from mChildren but still needs animation |
| * |
| * @param v View to add |
| */ |
| private void addDisappearingView(View v) { |
| ArrayList<View> disappearingChildren = mDisappearingChildren; |
| |
| if (disappearingChildren == null) { |
| disappearingChildren = mDisappearingChildren = new ArrayList<View>(); |
| } |
| |
| disappearingChildren.add(v); |
| } |
| |
| /** |
| * Cleanup a view when its animation is done. This may mean removing it from |
| * the list of disappearing views. |
| * |
| * @param view The view whose animation has finished |
| * @param animation The animation, cannot be null |
| */ |
| void finishAnimatingView(final View view, Animation animation) { |
| final ArrayList<View> disappearingChildren = mDisappearingChildren; |
| if (disappearingChildren != null) { |
| if (disappearingChildren.contains(view)) { |
| disappearingChildren.remove(view); |
| |
| if (view.mAttachInfo != null) { |
| view.dispatchDetachedFromWindow(); |
| } |
| |
| view.clearAnimation(); |
| mGroupFlags |= FLAG_INVALIDATE_REQUIRED; |
| } |
| } |
| |
| if (animation != null && !animation.getFillAfter()) { |
| view.clearAnimation(); |
| } |
| |
| if ((view.mPrivateFlags & ANIMATION_STARTED) == ANIMATION_STARTED) { |
| view.onAnimationEnd(); |
| // Should be performed by onAnimationEnd() but this avoid an infinite loop, |
| // so we'd rather be safe than sorry |
| view.mPrivateFlags &= ~ANIMATION_STARTED; |
| // Draw one more frame after the animation is done |
| mGroupFlags |= FLAG_INVALIDATE_REQUIRED; |
| } |
| } |
| |
| /** |
| * Utility function called by View during invalidation to determine whether a view that |
| * is invisible or gone should still be invalidated because it is being transitioned (and |
| * therefore still needs to be drawn). |
| */ |
| boolean isViewTransitioning(View view) { |
| return (mTransitioningViews != null && mTransitioningViews.contains(view)); |
| } |
| |
| /** |
| * This method tells the ViewGroup that the given View object, which should have this |
| * ViewGroup as its parent, |
| * should be kept around (re-displayed when the ViewGroup draws its children) even if it |
| * is removed from its parent. This allows animations, such as those used by |
| * {@link android.app.Fragment} and {@link android.animation.LayoutTransition} to animate |
| * the removal of views. A call to this method should always be accompanied by a later call |
| * to {@link #endViewTransition(View)}, such as after an animation on the View has finished, |
| * so that the View finally gets removed. |
| * |
| * @param view The View object to be kept visible even if it gets removed from its parent. |
| */ |
| public void startViewTransition(View view) { |
| if (view.mParent == this) { |
| if (mTransitioningViews == null) { |
| mTransitioningViews = new ArrayList<View>(); |
| } |
| mTransitioningViews.add(view); |
| } |
| } |
| |
| /** |
| * This method should always be called following an earlier call to |
| * {@link #startViewTransition(View)}. The given View is finally removed from its parent |
| * and will no longer be displayed. Note that this method does not perform the functionality |
| * of removing a view from its parent; it just discontinues the display of a View that |
| * has previously been removed. |
| * |
| * @return view The View object that has been removed but is being kept around in the visible |
| * hierarchy by an earlier call to {@link #startViewTransition(View)}. |
| */ |
| public void endViewTransition(View view) { |
| if (mTransitioningViews != null) { |
| mTransitioningViews.remove(view); |
| final ArrayList<View> disappearingChildren = mDisappearingChildren; |
| if (disappearingChildren != null && disappearingChildren.contains(view)) { |
| disappearingChildren.remove(view); |
| if (mVisibilityChangingChildren != null && |
| mVisibilityChangingChildren.contains(view)) { |
| mVisibilityChangingChildren.remove(view); |
| } else { |
| if (view.mAttachInfo != null) { |
| view.dispatchDetachedFromWindow(); |
| } |
| if (view.mParent != null) { |
| view.mParent = null; |
| } |
| } |
| mGroupFlags |= FLAG_INVALIDATE_REQUIRED; |
| } |
| } |
| } |
| |
| private LayoutTransition.TransitionListener mLayoutTransitionListener = |
| new LayoutTransition.TransitionListener() { |
| @Override |
| public void startTransition(LayoutTransition transition, ViewGroup container, |
| View view, int transitionType) { |
| // We only care about disappearing items, since we need special logic to keep |
| // those items visible after they've been 'removed' |
| if (transitionType == LayoutTransition.DISAPPEARING) { |
| startViewTransition(view); |
| } |
| } |
| |
| @Override |
| public void endTransition(LayoutTransition transition, ViewGroup container, |
| View view, int transitionType) { |
| if (mLayoutSuppressed && !transition.isChangingLayout()) { |
| requestLayout(); |
| mLayoutSuppressed = false; |
| } |
| if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) { |
| endViewTransition(view); |
| } |
| } |
| }; |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public boolean gatherTransparentRegion(Region region) { |
| // If no transparent regions requested, we are always opaque. |
| final boolean meOpaque = (mPrivateFlags & View.REQUEST_TRANSPARENT_REGIONS) == 0; |
| if (meOpaque && region == null) { |
| // The caller doesn't care about the region, so stop now. |
| return true; |
| } |
| super.gatherTransparentRegion(region); |
| final View[] children = mChildren; |
| final int count = mChildrenCount; |
| boolean noneOfTheChildrenAreTransparent = true; |
| for (int i = 0; i < count; i++) { |
| final View child = children[i]; |
| if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) { |
| if (!child.gatherTransparentRegion(region)) { |
| noneOfTheChildrenAreTransparent = false; |
| } |
| } |
| } |
| return meOpaque || noneOfTheChildrenAreTransparent; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public void requestTransparentRegion(View child) { |
| if (child != null) { |
| child.mPrivateFlags |= View.REQUEST_TRANSPARENT_REGIONS; |
| if (mParent != null) { |
| mParent.requestTransparentRegion(this); |
| } |
| } |
| } |
| |
| |
| @Override |
| protected boolean fitSystemWindows(Rect insets) { |
| boolean done = super.fitSystemWindows(insets); |
| if (!done) { |
| final int count = mChildrenCount; |
| final View[] children = mChildren; |
| for (int i = 0; i < count; i++) { |
| done = children[i].fitSystemWindows(insets); |
| if (done) { |
| break; |
| } |
| } |
| } |
| return done; |
| } |
| |
| /** |
| * Returns the animation listener to which layout animation events are |
| * sent. |
| * |
| * @return an {@link android.view.animation.Animation.AnimationListener} |
| */ |
| public Animation.AnimationListener getLayoutAnimationListener() { |
| return mAnimationListener; |
| } |
| |
| @Override |
| protected void drawableStateChanged() { |
| super.drawableStateChanged(); |
| |
| if ((mGroupFlags & FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE) != 0) { |
| if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { |
| throw new IllegalStateException("addStateFromChildren cannot be enabled if a" |
| + " child has duplicateParentState set to true"); |
| } |
| |
| final View[] children = mChildren; |
| final int count = mChildrenCount; |
| |
| for (int i = 0; i < count; i++) { |
| final View child = children[i]; |
| if ((child.mViewFlags & DUPLICATE_PARENT_STATE) != 0) { |
| child.refreshDrawableState(); |
| } |
| } |
| } |
| } |
| |
| @Override |
| public void jumpDrawablesToCurrentState() { |
| super.jumpDrawablesToCurrentState(); |
| final View[] children = mChildren; |
| final int count = mChildrenCount; |
| for (int i = 0; i < count; i++) { |
| children[i].jumpDrawablesToCurrentState(); |
| } |
| } |
| |
| @Override |
| protected int[] onCreateDrawableState(int extraSpace) { |
| if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) == 0) { |
| return super.onCreateDrawableState(extraSpace); |
| } |
| |
| int need = 0; |
| int n = getChildCount(); |
| for (int i = 0; i < n; i++) { |
| int[] childState = getChildAt(i).getDrawableState(); |
| |
| if (childState != null) { |
| need += childState.length; |
| } |
| } |
| |
| int[] state = super.onCreateDrawableState(extraSpace + need); |
| |
| for (int i = 0; i < n; i++) { |
| int[] childState = getChildAt(i).getDrawableState(); |
| |
| if (childState != null) { |
| state = mergeDrawableStates(state, childState); |
| } |
| } |
| |
| return state; |
| } |
| |
| /** |
| * Sets whether this ViewGroup's drawable states also include |
| * its children's drawable states. This is used, for example, to |
| * make a group appear to be focused when its child EditText or button |
| * is focused. |
| */ |
| public void setAddStatesFromChildren(boolean addsStates) { |
| if (addsStates) { |
| mGroupFlags |= FLAG_ADD_STATES_FROM_CHILDREN; |
| } else { |
| mGroupFlags &= ~FLAG_ADD_STATES_FROM_CHILDREN; |
| } |
| |
| refreshDrawableState(); |
| } |
| |
| /** |
| * Returns whether this ViewGroup's drawable states also include |
| * its children's drawable states. This is used, for example, to |
| * make a group appear to be focused when its child EditText or button |
| * is focused. |
| */ |
| public boolean addStatesFromChildren() { |
| return (mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0; |
| } |
| |
| /** |
| * If {link #addStatesFromChildren} is true, refreshes this group's |
| * drawable state (to include the states from its children). |
| */ |
| public void childDrawableStateChanged(View child) { |
| if ((mGroupFlags & FLAG_ADD_STATES_FROM_CHILDREN) != 0) { |
| refreshDrawableState(); |
| } |
| } |
| |
| /** |
| * Specifies the animation listener to which layout animation events must |
| * be sent. Only |
| * {@link android.view.animation.Animation.AnimationListener#onAnimationStart(Animation)} |
| * and |
| * {@link android.view.animation.Animation.AnimationListener#onAnimationEnd(Animation)} |
| * are invoked. |
| * |
| * @param animationListener the layout animation listener |
| */ |
| public void setLayoutAnimationListener(Animation.AnimationListener animationListener) { |
| mAnimationListener = animationListener; |
| } |
| |
| /** |
| * This method is called by LayoutTransition when there are 'changing' animations that need |
| * to start after the layout/setup phase. The request is forwarded to the ViewAncestor, who |
| * starts all pending transitions prior to the drawing phase in the current traversal. |
| * |
| * @param transition The LayoutTransition to be started on the next traversal. |
| * |
| * @hide |
| */ |
| public void requestTransitionStart(LayoutTransition transition) { |
| ViewRootImpl viewAncestor = getViewRootImpl(); |
| if (viewAncestor != null) { |
| viewAncestor.requestTransitionStart(transition); |
| } |
| } |
| |
| @Override |
| public void onResolvedLayoutDirectionReset() { |
| // Take care of resetting the children resolution too |
| final int count = getChildCount(); |
| for (int i = 0; i < count; i++) { |
| final View child = getChildAt(i); |
| if (child.getLayoutDirection() == LAYOUT_DIRECTION_INHERIT) { |
| child.resetResolvedLayoutDirection(); |
| } |
| } |
| } |
| |
| @Override |
| public void onResolvedTextDirectionReset() { |
| // Take care of resetting the children resolution too |
| final int count = getChildCount(); |
| for (int i = 0; i < count; i++) { |
| final View child = getChildAt(i); |
| if (child.getTextDirection() == TEXT_DIRECTION_INHERIT) { |
| child.resetResolvedTextDirection(); |
| } |
| } |
| } |
| |
| /** |
| * Return true if the pressed state should be delayed for children or descendants of this |
| * ViewGroup. Generally, this should be done for containers that can scroll, such as a List. |
| * This prevents the pressed state from appearing when the user is actually trying to scroll |
| * the content. |
| * |
| * The default implementation returns true for compatibility reasons. Subclasses that do |
| * not scroll should generally override this method and return false. |
| */ |
| public boolean shouldDelayChildPressedState() { |
| return true; |
| } |
| |
| /** @hide */ |
| protected void onSetLayoutParams(View child, LayoutParams layoutParams) { |
| } |
| |
| /** |
| * LayoutParams are used by views to tell their parents how they want to be |
| * laid out. See |
| * {@link android.R.styleable#ViewGroup_Layout ViewGroup Layout Attributes} |
| * for a list of all child view attributes that this class supports. |
| * |
| * <p> |
| * The base LayoutParams class just describes how big the view wants to be |
| * for both width and height. For each dimension, it can specify one of: |
| * <ul> |
| * <li>FILL_PARENT (renamed MATCH_PARENT in API Level 8 and higher), which |
| * means that the view wants to be as big as its parent (minus padding) |
| * <li> WRAP_CONTENT, which means that the view wants to be just big enough |
| * to enclose its content (plus padding) |
| * <li> an exact number |
| * </ul> |
| * There are subclasses of LayoutParams for different subclasses of |
| * ViewGroup. For example, AbsoluteLayout has its own subclass of |
| * LayoutParams which adds an X and Y value.</p> |
| * |
| * <div class="special reference"> |
| * <h3>Developer Guides</h3> |
| * <p>For more information about creating user interface layouts, read the |
| * <a href="{@docRoot}guide/topics/ui/declaring-layout.html">XML Layouts</a> developer |
| * guide.</p></div> |
| * |
| * @attr ref android.R.styleable#ViewGroup_Layout_layout_height |
| * @attr ref android.R.styleable#ViewGroup_Layout_layout_width |
| */ |
| public static class LayoutParams { |
| /** |
| * Special value for the height or width requested by a View. |
| * FILL_PARENT means that the view wants to be as big as its parent, |
| * minus the parent's padding, if any. This value is deprecated |
| * starting in API Level 8 and replaced by {@link #MATCH_PARENT}. |
| */ |
| @SuppressWarnings({"UnusedDeclaration"}) |
| @Deprecated |
| public static final int FILL_PARENT = -1; |
| |
| /** |
| * Special value for the height or width requested by a View. |
| * MATCH_PARENT means that the view wants to be as big as its parent, |
| * minus the parent's padding, if any. Introduced in API Level 8. |
| */ |
| public static final int MATCH_PARENT = -1; |
| |
| /** |
| * Special value for the height or width requested by a View. |
| * WRAP_CONTENT means that the view wants to be just large enough to fit |
| * its own internal content, taking its own padding into account. |
| */ |
| public static final int WRAP_CONTENT = -2; |
| |
| /** |
| * Information about how wide the view wants to be. Can be one of the |
| * constants FILL_PARENT (replaced by MATCH_PARENT , |
| * in API Level 8) or WRAP_CONTENT. or an exact size. |
| */ |
| @ViewDebug.ExportedProperty(category = "layout", mapping = { |
| @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), |
| @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") |
| }) |
| public int width; |
| |
| /** |
| * Information about how tall the view wants to be. Can be one of the |
| * constants FILL_PARENT (replaced by MATCH_PARENT , |
| * in API Level 8) or WRAP_CONTENT. or an exact size. |
| */ |
| @ViewDebug.ExportedProperty(category = "layout", mapping = { |
| @ViewDebug.IntToString(from = MATCH_PARENT, to = "MATCH_PARENT"), |
| @ViewDebug.IntToString(from = WRAP_CONTENT, to = "WRAP_CONTENT") |
| }) |
| public int height; |
| |
| /** |
| * Used to animate layouts. |
| */ |
| public LayoutAnimationController.AnimationParameters layoutAnimationParameters; |
| |
| /** |
| * Creates a new set of layout parameters. The values are extracted from |
| * the supplied attributes set and context. The XML attributes mapped |
| * to this set of layout parameters are: |
| * |
| * <ul> |
| * <li><code>layout_width</code>: the width, either an exact value, |
| * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by |
| * {@link #MATCH_PARENT} in API Level 8)</li> |
| * <li><code>layout_height</code>: the height, either an exact value, |
| * {@link #WRAP_CONTENT}, or {@link #FILL_PARENT} (replaced by |
| * {@link #MATCH_PARENT} in API Level 8)</li> |
| * </ul> |
| * |
| * @param c the application environment |
| * @param attrs the set of attributes from which to extract the layout |
| * parameters' values |
| */ |
| public LayoutParams(Context c, AttributeSet attrs) { |
| TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_Layout); |
| setBaseAttributes(a, |
| R.styleable.ViewGroup_Layout_layout_width, |
| R.styleable.ViewGroup_Layout_layout_height); |
| a.recycle(); |
| } |
| |
| /** |
| * Creates a new set of layout parameters with the specified width |
| * and height. |
| * |
| * @param width the width, either {@link #WRAP_CONTENT}, |
| * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in |
| * API Level 8), or a fixed size in pixels |
| * @param height the height, either {@link #WRAP_CONTENT}, |
| * {@link #FILL_PARENT} (replaced by {@link #MATCH_PARENT} in |
| * API Level 8), or a fixed size in pixels |
| */ |
| public LayoutParams(int width, int height) { |
| this.width = width; |
| this.height = height; |
| } |
| |
| /** |
| * Copy constructor. Clones the width and height values of the source. |
| * |
| * @param source The layout params to copy from. |
| */ |
| public LayoutParams(LayoutParams source) { |
| this.width = source.width; |
| this.height = source.height; |
| } |
| |
| /** |
| * Used internally by MarginLayoutParams. |
| * @hide |
| */ |
| LayoutParams() { |
| } |
| |
| /** |
| * Extracts the layout parameters from the supplied attributes. |
| * |
| * @param a the style attributes to extract the parameters from |
| * @param widthAttr the identifier of the width attribute |
| * @param heightAttr the identifier of the height attribute |
| */ |
| protected void setBaseAttributes(TypedArray a, int widthAttr, int heightAttr) { |
| width = a.getLayoutDimension(widthAttr, "layout_width"); |
| height = a.getLayoutDimension(heightAttr, "layout_height"); |
| } |
| |
| /** |
| * Resolve layout parameters depending on the layout direction. Subclasses that care about |
| * layoutDirection changes should override this method. The default implementation does |
| * nothing. |
| * |
| * @param layoutDirection the direction of the layout |
| * |
| * {@link View#LAYOUT_DIRECTION_LTR} |
| * {@link View#LAYOUT_DIRECTION_RTL} |
| */ |
| public void onResolveLayoutDirection(int layoutDirection) { |
| } |
| |
| /** |
| * Returns a String representation of this set of layout parameters. |
| * |
| * @param output the String to prepend to the internal representation |
| * @return a String with the following format: output + |
| * "ViewGroup.LayoutParams={ width=WIDTH, height=HEIGHT }" |
| * |
| * @hide |
| */ |
| public String debug(String output) { |
| return output + "ViewGroup.LayoutParams={ width=" |
| + sizeToString(width) + ", height=" + sizeToString(height) + " }"; |
| } |
| |
| /** |
| * Converts the specified size to a readable String. |
| * |
| * @param size the size to convert |
| * @return a String instance representing the supplied size |
| * |
| * @hide |
| */ |
| protected static String sizeToString(int size) { |
| if (size == WRAP_CONTENT) { |
| return "wrap-content"; |
| } |
| if (size == MATCH_PARENT) { |
| return "match-parent"; |
| } |
| return String.valueOf(size); |
| } |
| } |
| |
| /** |
| * Per-child layout information for layouts that support margins. |
| * See |
| * {@link android.R.styleable#ViewGroup_MarginLayout ViewGroup Margin Layout Attributes} |
| * for a list of all child view attributes that this class supports. |
| */ |
| public static class MarginLayoutParams extends ViewGroup.LayoutParams { |
| /** |
| * The left margin in pixels of the child. |
| * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value |
| * to this field. |
| */ |
| @ViewDebug.ExportedProperty(category = "layout") |
| public int leftMargin; |
| |
| /** |
| * The top margin in pixels of the child. |
| * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value |
| * to this field. |
| */ |
| @ViewDebug.ExportedProperty(category = "layout") |
| public int topMargin; |
| |
| /** |
| * The right margin in pixels of the child. |
| * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value |
| * to this field. |
| */ |
| @ViewDebug.ExportedProperty(category = "layout") |
| public int rightMargin; |
| |
| /** |
| * The bottom margin in pixels of the child. |
| * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value |
| * to this field. |
| */ |
| @ViewDebug.ExportedProperty(category = "layout") |
| public int bottomMargin; |
| |
| /** |
| * The start margin in pixels of the child. |
| * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value |
| * to this field. |
| */ |
| @ViewDebug.ExportedProperty(category = "layout") |
| public int startMargin = DEFAULT_RELATIVE; |
| |
| /** |
| * The end margin in pixels of the child. |
| * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value |
| * to this field. |
| */ |
| @ViewDebug.ExportedProperty(category = "layout") |
| public int endMargin = DEFAULT_RELATIVE; |
| |
| /** |
| * The default start and end margin. |
| */ |
| static private final int DEFAULT_RELATIVE = Integer.MIN_VALUE; |
| |
| /** |
| * Creates a new set of layout parameters. The values are extracted from |
| * the supplied attributes set and context. |
| * |
| * @param c the application environment |
| * @param attrs the set of attributes from which to extract the layout |
| * parameters' values |
| */ |
| public MarginLayoutParams(Context c, AttributeSet attrs) { |
| super(); |
| |
| TypedArray a = c.obtainStyledAttributes(attrs, R.styleable.ViewGroup_MarginLayout); |
| setBaseAttributes(a, |
| R.styleable.ViewGroup_MarginLayout_layout_width, |
| R.styleable.ViewGroup_MarginLayout_layout_height); |
| |
| int margin = a.getDimensionPixelSize( |
| com.android.internal.R.styleable.ViewGroup_MarginLayout_layout_margin, -1); |
| if (margin >= 0) { |
| leftMargin = margin; |
| topMargin = margin; |
| rightMargin= margin; |
| bottomMargin = margin; |
| } else { |
| leftMargin = a.getDimensionPixelSize( |
| R.styleable.ViewGroup_MarginLayout_layout_marginLeft, 0); |
| topMargin = a.getDimensionPixelSize( |
| R.styleable.ViewGroup_MarginLayout_layout_marginTop, 0); |
| rightMargin = a.getDimensionPixelSize( |
| R.styleable.ViewGroup_MarginLayout_layout_marginRight, 0); |
| bottomMargin = a.getDimensionPixelSize( |
| R.styleable.ViewGroup_MarginLayout_layout_marginBottom, 0); |
| startMargin = a.getDimensionPixelSize( |
| R.styleable.ViewGroup_MarginLayout_layout_marginStart, DEFAULT_RELATIVE); |
| endMargin = a.getDimensionPixelSize( |
| R.styleable.ViewGroup_MarginLayout_layout_marginEnd, DEFAULT_RELATIVE); |
| } |
| |
| a.recycle(); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public MarginLayoutParams(int width, int height) { |
| super(width, height); |
| } |
| |
| /** |
| * Copy constructor. Clones the width, height and margin values of the source. |
| * |
| * @param source The layout params to copy from. |
| */ |
| public MarginLayoutParams(MarginLayoutParams source) { |
| this.width = source.width; |
| this.height = source.height; |
| |
| this.leftMargin = source.leftMargin; |
| this.topMargin = source.topMargin; |
| this.rightMargin = source.rightMargin; |
| this.bottomMargin = source.bottomMargin; |
| this.startMargin = source.startMargin; |
| this.endMargin = source.endMargin; |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| public MarginLayoutParams(LayoutParams source) { |
| super(source); |
| } |
| |
| /** |
| * Sets the margins, in pixels. A call to {@link android.view.View#requestLayout()} needs |
| * to be done so that the new margins are taken into account. Left and right margins may be |
| * overriden by {@link android.view.View#requestLayout()} depending on layout direction. |
| * |
| * @param left the left margin size |
| * @param top the top margin size |
| * @param right the right margin size |
| * @param bottom the bottom margin size |
| * |
| * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginLeft |
| * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop |
| * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginRight |
| * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom |
| */ |
| public void setMargins(int left, int top, int right, int bottom) { |
| leftMargin = left; |
| topMargin = top; |
| rightMargin = right; |
| bottomMargin = bottom; |
| } |
| |
| /** |
| * Sets the relative margins, in pixels. A call to {@link android.view.View#requestLayout()} |
| * needs to be done so that the new relative margins are taken into account. Left and right |
| * margins may be overriden by {@link android.view.View#requestLayout()} depending on layout |
| * direction. |
| * |
| * @param start the start margin size |
| * @param top the top margin size |
| * @param end the right margin size |
| * @param bottom the bottom margin size |
| * |
| * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart |
| * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginTop |
| * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd |
| * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginBottom |
| * |
| * @hide |
| */ |
| public void setMarginsRelative(int start, int top, int end, int bottom) { |
| startMargin = start; |
| topMargin = top; |
| endMargin = end; |
| bottomMargin = bottom; |
| } |
| |
| /** |
| * Returns the start margin in pixels. |
| * |
| * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart |
| * |
| * @return the start margin in pixels. |
| */ |
| public int getMarginStart() { |
| return startMargin; |
| } |
| |
| /** |
| * Returns the end margin in pixels. |
| * |
| * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd |
| * |
| * @return the end margin in pixels. |
| */ |
| public int getMarginEnd() { |
| return endMargin; |
| } |
| |
| /** |
| * Check if margins are relative. |
| * |
| * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart |
| * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd |
| * |
| * @return true if either marginStart or marginEnd has been set |
| */ |
| public boolean isMarginRelative() { |
| return (startMargin != DEFAULT_RELATIVE) || (endMargin != DEFAULT_RELATIVE); |
| } |
| |
| /** |
| * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins |
| * may be overridden depending on layout direction. |
| */ |
| @Override |
| public void onResolveLayoutDirection(int layoutDirection) { |
| switch(layoutDirection) { |
| case View.LAYOUT_DIRECTION_RTL: |
| leftMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : leftMargin; |
| rightMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : rightMargin; |
| break; |
| case View.LAYOUT_DIRECTION_LTR: |
| default: |
| leftMargin = (startMargin > DEFAULT_RELATIVE) ? startMargin : leftMargin; |
| rightMargin = (endMargin > DEFAULT_RELATIVE) ? endMargin : rightMargin; |
| break; |
| } |
| } |
| } |
| |
| /* Describes a touched view and the ids of the pointers that it has captured. |
| * |
| * This code assumes that pointer ids are always in the range 0..31 such that |
| * it can use a bitfield to track which pointer ids are present. |
| * As it happens, the lower layers of the input dispatch pipeline also use the |
| * same trick so the assumption should be safe here... |
| */ |
| private static final class TouchTarget { |
| private static final int MAX_RECYCLED = 32; |
| private static final Object sRecycleLock = new Object(); |
| private static TouchTarget sRecycleBin; |
| private static int sRecycledCount; |
| |
| public static final int ALL_POINTER_IDS = -1; // all ones |
| |
| // The touched child view. |
| public View child; |
| |
| // The combined bit mask of pointer ids for all pointers captured by the target. |
| public int pointerIdBits; |
| |
| // The next target in the target list. |
| public TouchTarget next; |
| |
| private TouchTarget() { |
| } |
| |
| public static TouchTarget obtain(View child, int pointerIdBits) { |
| final TouchTarget target; |
| synchronized (sRecycleLock) { |
| if (sRecycleBin == null) { |
| target = new TouchTarget(); |
| } else { |
| target = sRecycleBin; |
| sRecycleBin = target.next; |
| sRecycledCount--; |
| target.next = null; |
| } |
| } |
| target.child = child; |
| target.pointerIdBits = pointerIdBits; |
| return target; |
| } |
| |
| public void recycle() { |
| synchronized (sRecycleLock) { |
| if (sRecycledCount < MAX_RECYCLED) { |
| next = sRecycleBin; |
| sRecycleBin = this; |
| sRecycledCount += 1; |
| } else { |
| next = null; |
| } |
| child = null; |
| } |
| } |
| } |
| |
| /* Describes a hovered view. */ |
| private static final class HoverTarget { |
| private static final int MAX_RECYCLED = 32; |
| private static final Object sRecycleLock = new Object(); |
| private static HoverTarget sRecycleBin; |
| private static int sRecycledCount; |
| |
| // The hovered child view. |
| public View child; |
| |
| // The next target in the target list. |
| public HoverTarget next; |
| |
| private HoverTarget() { |
| } |
| |
| public static HoverTarget obtain(View child) { |
| final HoverTarget target; |
| synchronized (sRecycleLock) { |
| if (sRecycleBin == null) { |
| target = new HoverTarget(); |
| } else { |
| target = sRecycleBin; |
| sRecycleBin = target.next; |
| sRecycledCount--; |
| target.next = null; |
| } |
| } |
| target.child = child; |
| return target; |
| } |
| |
| public void recycle() { |
| synchronized (sRecycleLock) { |
| if (sRecycledCount < MAX_RECYCLED) { |
| next = sRecycleBin; |
| sRecycleBin = this; |
| sRecycledCount += 1; |
| } else { |
| next = null; |
| } |
| child = null; |
| } |
| } |
| } |
| } |