Import Android SDK Platform PI [4335822]
/google/data/ro/projects/android/fetch_artifact \
--bid 4335822 \
--target sdk_phone_armv7-win_sdk \
sdk-repo-linux-sources-4335822.zip
AndroidVersion.ApiLevel has been modified to appear as 28
Change-Id: Ic8f04be005a71c2b9abeaac754d8da8d6f9a2c32
diff --git a/android/view/ViewGroup.java b/android/view/ViewGroup.java
new file mode 100644
index 0000000..b2e5a16
--- /dev/null
+++ b/android/view/ViewGroup.java
@@ -0,0 +1,8528 @@
+/*
+ * 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 static android.os.Build.VERSION_CODES.JELLY_BEAN_MR1;
+
+import android.animation.LayoutTransition;
+import android.annotation.CallSuper;
+import android.annotation.IdRes;
+import android.annotation.NonNull;
+import android.annotation.TestApi;
+import android.annotation.UiThread;
+import android.content.ClipData;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.res.Configuration;
+import android.content.res.TypedArray;
+import android.graphics.Bitmap;
+import android.graphics.Canvas;
+import android.graphics.Color;
+import android.graphics.Insets;
+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.Bundle;
+import android.os.Parcelable;
+import android.os.SystemClock;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.util.Pools;
+import android.util.Pools.SynchronizedPool;
+import android.util.SparseArray;
+import android.util.SparseBooleanArray;
+import android.view.accessibility.AccessibilityEvent;
+import android.view.accessibility.AccessibilityManager;
+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 java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Predicate;
+
+/**
+ * <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>
+ *
+ * <p>Here is a complete implementation of a custom ViewGroup that implements
+ * a simple {@link android.widget.FrameLayout} along with the ability to stack
+ * children in left and right gutters.</p>
+ *
+ * {@sample development/samples/ApiDemos/src/com/example/android/apis/view/CustomLayout.java
+ * Complete}
+ *
+ * <p>If you are implementing XML layout attributes as shown in the example, this is the
+ * corresponding definition for them that would go in <code>res/values/attrs.xml</code>:</p>
+ *
+ * {@sample development/samples/ApiDemos/res/values/attrs.xml CustomLayout}
+ *
+ * <p>Finally the layout manager can be used in an XML layout like so:</p>
+ *
+ * {@sample development/samples/ApiDemos/res/layout/custom_layout.xml Complete}
+ *
+ * @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
+ * @attr ref android.R.styleable#ViewGroup_splitMotionEvents
+ * @attr ref android.R.styleable#ViewGroup_layoutMode
+ */
+@UiThread
+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;
+ // The view contained within this ViewGroup (excluding nested keyboard navigation clusters)
+ // that is or contains a default-focus view.
+ private View mDefaultFocus;
+ // The last child of this ViewGroup which held focus within the current cluster
+ View mFocusedInCluster;
+
+ /**
+ * A Transformation used when drawing children, to
+ * apply on the child being drawn.
+ */
+ private Transformation mChildTransformation;
+
+ /**
+ * 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;
+
+ // Current frontmost child that can accept drag and lies under the drag location.
+ // Used only to generate ENTER/EXIT events for pre-Nougat aps.
+ private View mCurrentDragChild;
+
+ // Metadata about the ongoing drag
+ private DragEvent mCurrentDragStartEvent;
+ private boolean mIsInterestedInDrag;
+ private HashSet<View> mChildrenInterestedInDrag;
+
+ // Used during drag dispatch
+ private PointF mLocalPoint;
+
+ // Lazily-created holder for point computations.
+ private float[] mTempPoint;
+
+ // 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;
+
+ // The child capable of showing a tooltip and currently under the pointer.
+ private View mTooltipHoverTarget;
+
+ // True if the view group is capable of showing a tooltip and the pointer is directly
+ // over the view group but not one of its child views.
+ private boolean mTooltipHoveredSelf;
+
+ /**
+ * Internal flags.
+ *
+ * This field should be made private, so it is hidden from the SDK.
+ * {@hide}
+ */
+ @ViewDebug.ExportedProperty(flagMapping = {
+ @ViewDebug.FlagToString(mask = FLAG_CLIP_CHILDREN, equals = FLAG_CLIP_CHILDREN,
+ name = "CLIP_CHILDREN"),
+ @ViewDebug.FlagToString(mask = FLAG_CLIP_TO_PADDING, equals = FLAG_CLIP_TO_PADDING,
+ name = "CLIP_TO_PADDING"),
+ @ViewDebug.FlagToString(mask = FLAG_PADDING_NOT_NULL, equals = FLAG_PADDING_NOT_NULL,
+ name = "PADDING_NOT_NULL")
+ }, formatToHexString = true)
+ protected int mGroupFlags;
+
+ /**
+ * Either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}.
+ */
+ private int mLayoutMode = LAYOUT_MODE_UNDEFINED;
+
+ /**
+ * 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;
+
+ /** @deprecated - functionality removed */
+ @Deprecated
+ 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;
+
+ // UNUSED FLAG VALUE: 0x1000;
+
+ /**
+ * When set, this ViewGroup's drawable states also include those
+ * of its children.
+ */
+ private static final int FLAG_ADD_STATES_FROM_CHILDREN = 0x2000;
+
+ /** @deprecated functionality removed */
+ @Deprecated
+ private static final int FLAG_ALWAYS_DRAWN_WITH_CACHE = 0x4000;
+
+ /** @deprecated functionality removed */
+ @Deprecated
+ private 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;
+
+ /**
+ * When true, indicates that a layoutMode has been explicitly set, either with
+ * an explicit call to {@link #setLayoutMode(int)} in code or from an XML resource.
+ * This distinguishes the situation in which a layout mode was inherited from
+ * one of the ViewGroup's ancestors and cached locally.
+ */
+ private static final int FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET = 0x800000;
+
+ static final int FLAG_IS_TRANSITION_GROUP = 0x1000000;
+
+ static final int FLAG_IS_TRANSITION_GROUP_SET = 0x2000000;
+
+ /**
+ * When set, focus will not be permitted to enter this group if a touchscreen is present.
+ */
+ static final int FLAG_TOUCHSCREEN_BLOCKS_FOCUS = 0x4000000;
+
+ /**
+ * When true, indicates that a call to startActionModeForChild was made with the type parameter
+ * and should not be ignored. This helps in backwards compatibility with the existing method
+ * without a type.
+ *
+ * @see #startActionModeForChild(View, android.view.ActionMode.Callback)
+ * @see #startActionModeForChild(View, android.view.ActionMode.Callback, int)
+ */
+ private static final int FLAG_START_ACTION_MODE_FOR_CHILD_IS_TYPED = 0x8000000;
+
+ /**
+ * When true, indicates that a call to startActionModeForChild was made without the type
+ * parameter. This helps in backwards compatibility with the existing method
+ * without a type.
+ *
+ * @see #startActionModeForChild(View, android.view.ActionMode.Callback)
+ * @see #startActionModeForChild(View, android.view.ActionMode.Callback, int)
+ */
+ private static final int FLAG_START_ACTION_MODE_FOR_CHILD_IS_NOT_TYPED = 0x10000000;
+
+ /**
+ * When set, indicates that a call to showContextMenuForChild was made with explicit
+ * coordinates within the initiating child view.
+ */
+ private static final int FLAG_SHOW_CONTEXT_MENU_WITH_COORDS = 0x20000000;
+
+ /**
+ * 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;
+
+ // Layout Modes
+
+ private static final int LAYOUT_MODE_UNDEFINED = -1;
+
+ /**
+ * This constant is a {@link #setLayoutMode(int) layoutMode}.
+ * Clip bounds are the raw values of {@link #getLeft() left}, {@link #getTop() top},
+ * {@link #getRight() right} and {@link #getBottom() bottom}.
+ */
+ public static final int LAYOUT_MODE_CLIP_BOUNDS = 0;
+
+ /**
+ * This constant is a {@link #setLayoutMode(int) layoutMode}.
+ * Optical bounds describe where a widget appears to be. They sit inside the clip
+ * bounds which need to cover a larger area to allow other effects,
+ * such as shadows and glows, to be drawn.
+ */
+ public static final int LAYOUT_MODE_OPTICAL_BOUNDS = 1;
+
+ /** @hide */
+ public static int LAYOUT_MODE_DEFAULT = LAYOUT_MODE_CLIP_BOUNDS;
+
+ /**
+ * 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 int mChildrenCount;
+
+ // Whether layout calls are currently being suppressed, controlled by calls to
+ // suppressLayout()
+ boolean mSuppressLayout = false;
+
+ // Whether any layout calls have actually been suppressed while mSuppressLayout
+ // has been true. This tracks whether we need to issue a requestLayout() when
+ // layout is later re-enabled.
+ private boolean mLayoutCalledWhileSuppressed = false;
+
+ private static final int ARRAY_INITIAL_CAPACITY = 12;
+ private static final int ARRAY_CAPACITY_INCREMENT = 12;
+
+ private static float[] sDebugLines;
+
+ // 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;
+
+ // Temporary holder of presorted children, only used for
+ // input/software draw dispatch for correctly Z ordering.
+ private ArrayList<View> mPreSortedChildren;
+
+ // Indicates how many of this container's child subtrees contain transient state
+ @ViewDebug.ExportedProperty(category = "layout")
+ private int mChildCountWithTransientState = 0;
+
+ /**
+ * Currently registered axes for nested scrolling. Flag set consisting of
+ * {@link #SCROLL_AXIS_HORIZONTAL} {@link #SCROLL_AXIS_VERTICAL} or {@link #SCROLL_AXIS_NONE}
+ * for null.
+ */
+ private int mNestedScrollAxes;
+
+ // Used to manage the list of transient views, added by addTransientView()
+ private List<Integer> mTransientIndices = null;
+ private List<View> mTransientViews = null;
+
+
+ /**
+ * Empty ActionMode used as a sentinel in recursive entries to startActionModeForChild.
+ *
+ * @see #startActionModeForChild(View, android.view.ActionMode.Callback)
+ * @see #startActionModeForChild(View, android.view.ActionMode.Callback, int)
+ */
+ private static final ActionMode SENTINEL_ACTION_MODE = new ActionMode() {
+ @Override
+ public void setTitle(CharSequence title) {}
+
+ @Override
+ public void setTitle(int resId) {}
+
+ @Override
+ public void setSubtitle(CharSequence subtitle) {}
+
+ @Override
+ public void setSubtitle(int resId) {}
+
+ @Override
+ public void setCustomView(View view) {}
+
+ @Override
+ public void invalidate() {}
+
+ @Override
+ public void finish() {}
+
+ @Override
+ public Menu getMenu() {
+ return null;
+ }
+
+ @Override
+ public CharSequence getTitle() {
+ return null;
+ }
+
+ @Override
+ public CharSequence getSubtitle() {
+ return null;
+ }
+
+ @Override
+ public View getCustomView() {
+ return null;
+ }
+
+ @Override
+ public MenuInflater getMenuInflater() {
+ return null;
+ }
+ };
+
+ public ViewGroup(Context context) {
+ this(context, null);
+ }
+
+ public ViewGroup(Context context, AttributeSet attrs) {
+ this(context, attrs, 0);
+ }
+
+ public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr) {
+ this(context, attrs, defStyleAttr, 0);
+ }
+
+ public ViewGroup(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+ super(context, attrs, defStyleAttr, defStyleRes);
+
+ initViewGroup();
+ initFromAttributes(context, attrs, defStyleAttr, defStyleRes);
+ }
+
+ private void initViewGroup() {
+ // ViewGroup doesn't draw by default
+ if (!debugDraw()) {
+ 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, int defStyleAttr, int defStyleRes) {
+ final TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.ViewGroup, defStyleAttr,
+ defStyleRes);
+
+ 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;
+ case R.styleable.ViewGroup_layoutMode:
+ setLayoutMode(a.getInt(attr, LAYOUT_MODE_UNDEFINED));
+ break;
+ case R.styleable.ViewGroup_transitionGroup:
+ setTransitionGroup(a.getBoolean(attr, false));
+ break;
+ case R.styleable.ViewGroup_touchscreenBlocksFocus:
+ setTouchscreenBlocksFocus(a.getBoolean(attr, false));
+ 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);
+ }
+
+ @Override
+ void handleFocusGainInternal(int direction, Rect previouslyFocusedRect) {
+ if (mFocused != null) {
+ mFocused.unFocus(this);
+ mFocused = null;
+ mFocusedInCluster = null;
+ }
+ super.handleFocusGainInternal(direction, previouslyFocusedRect);
+ }
+
+ @Override
+ 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(focused);
+
+ // We had a previous notion of who had focus. Clear it.
+ if (mFocused != child) {
+ if (mFocused != null) {
+ mFocused.unFocus(focused);
+ }
+
+ mFocused = child;
+ }
+ if (mParent != null) {
+ mParent.requestChildFocus(this, focused);
+ }
+ }
+
+ void setDefaultFocus(View child) {
+ // Stop at any higher view which is explicitly focused-by-default
+ if (mDefaultFocus != null && mDefaultFocus.isFocusedByDefault()) {
+ return;
+ }
+
+ mDefaultFocus = child;
+
+ if (mParent instanceof ViewGroup) {
+ ((ViewGroup) mParent).setDefaultFocus(this);
+ }
+ }
+
+ /**
+ * Clears the default-focus chain from {@param child} up to the first parent which has another
+ * default-focusable branch below it or until there is no default-focus chain.
+ *
+ * @param child
+ */
+ void clearDefaultFocus(View child) {
+ // Stop at any higher view which is explicitly focused-by-default
+ if (mDefaultFocus != child && mDefaultFocus != null
+ && mDefaultFocus.isFocusedByDefault()) {
+ return;
+ }
+
+ mDefaultFocus = null;
+
+ // Search child siblings for default focusables.
+ for (int i = 0; i < mChildrenCount; ++i) {
+ View sibling = mChildren[i];
+ if (sibling.isFocusedByDefault()) {
+ mDefaultFocus = sibling;
+ return;
+ } else if (mDefaultFocus == null && sibling.hasDefaultFocus()) {
+ mDefaultFocus = sibling;
+ }
+ }
+
+ if (mParent instanceof ViewGroup) {
+ ((ViewGroup) mParent).clearDefaultFocus(this);
+ }
+ }
+
+ @Override
+ boolean hasDefaultFocus() {
+ return mDefaultFocus != null || super.hasDefaultFocus();
+ }
+
+ /**
+ * Removes {@code child} (and associated focusedInCluster chain) from the cluster containing
+ * it.
+ * <br>
+ * This is intended to be run on {@code child}'s immediate parent. This is necessary because
+ * the chain is sometimes cleared after {@code child} has been detached.
+ */
+ void clearFocusedInCluster(View child) {
+ if (mFocusedInCluster != child) {
+ return;
+ }
+ clearFocusedInCluster();
+ }
+
+ /**
+ * Removes the focusedInCluster chain from this up to the cluster containing it.
+ */
+ void clearFocusedInCluster() {
+ View top = findKeyboardNavigationCluster();
+ ViewParent parent = this;
+ do {
+ ((ViewGroup) parent).mFocusedInCluster = null;
+ if (parent == top) {
+ break;
+ }
+ parent = parent.getParent();
+ } while (parent instanceof ViewGroup);
+ }
+
+ @Override
+ public void focusableViewAvailable(View v) {
+ if (mParent != null
+ // shortcut: don't report a new focusable view if we block our descendants from
+ // getting focus or if we're not visible
+ && (getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS)
+ && ((mViewFlags & VISIBILITY_MASK) == VISIBLE)
+ && (isFocusableInTouchMode() || !shouldBlockFocusForTouchscreen())
+ // 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);
+ }
+ }
+
+ @Override
+ public boolean showContextMenuForChild(View originalView) {
+ if (isShowingContextMenuWithCoords()) {
+ // We're being called for compatibility. Return false and let the version
+ // with coordinates recurse up.
+ return false;
+ }
+ return mParent != null && mParent.showContextMenuForChild(originalView);
+ }
+
+ /**
+ * @hide used internally for compatibility with existing app code only
+ */
+ public final boolean isShowingContextMenuWithCoords() {
+ return (mGroupFlags & FLAG_SHOW_CONTEXT_MENU_WITH_COORDS) != 0;
+ }
+
+ @Override
+ public boolean showContextMenuForChild(View originalView, float x, float y) {
+ try {
+ mGroupFlags |= FLAG_SHOW_CONTEXT_MENU_WITH_COORDS;
+ if (showContextMenuForChild(originalView)) {
+ return true;
+ }
+ } finally {
+ mGroupFlags &= ~FLAG_SHOW_CONTEXT_MENU_WITH_COORDS;
+ }
+ return mParent != null && mParent.showContextMenuForChild(originalView, x, y);
+ }
+
+ @Override
+ public ActionMode startActionModeForChild(View originalView, ActionMode.Callback callback) {
+ if ((mGroupFlags & FLAG_START_ACTION_MODE_FOR_CHILD_IS_TYPED) == 0) {
+ // This is the original call.
+ try {
+ mGroupFlags |= FLAG_START_ACTION_MODE_FOR_CHILD_IS_NOT_TYPED;
+ return startActionModeForChild(originalView, callback, ActionMode.TYPE_PRIMARY);
+ } finally {
+ mGroupFlags &= ~FLAG_START_ACTION_MODE_FOR_CHILD_IS_NOT_TYPED;
+ }
+ } else {
+ // We are being called from the new method with type.
+ return SENTINEL_ACTION_MODE;
+ }
+ }
+
+ @Override
+ public ActionMode startActionModeForChild(
+ View originalView, ActionMode.Callback callback, int type) {
+ if ((mGroupFlags & FLAG_START_ACTION_MODE_FOR_CHILD_IS_NOT_TYPED) == 0
+ && type == ActionMode.TYPE_PRIMARY) {
+ ActionMode mode;
+ try {
+ mGroupFlags |= FLAG_START_ACTION_MODE_FOR_CHILD_IS_TYPED;
+ mode = startActionModeForChild(originalView, callback);
+ } finally {
+ mGroupFlags &= ~FLAG_START_ACTION_MODE_FOR_CHILD_IS_TYPED;
+ }
+ if (mode != SENTINEL_ACTION_MODE) {
+ return mode;
+ }
+ }
+ if (mParent != null) {
+ try {
+ return mParent.startActionModeForChild(originalView, callback, type);
+ } catch (AbstractMethodError ame) {
+ // Custom view parents might not implement this method.
+ return mParent.startActionModeForChild(originalView, callback);
+ }
+ }
+ return null;
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public boolean dispatchActivityResult(
+ String who, int requestCode, int resultCode, Intent data) {
+ if (super.dispatchActivityResult(who, requestCode, resultCode, data)) {
+ return true;
+ }
+ int childCount = getChildCount();
+ for (int i = 0; i < childCount; i++) {
+ View child = getChildAt(i);
+ if (child.dispatchActivityResult(who, requestCode, resultCode, data)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * 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.
+ */
+ @Override
+ 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;
+ }
+
+ @Override
+ public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) {
+ return false;
+ }
+
+ @Override
+ public boolean requestSendAccessibilityEvent(View child, AccessibilityEvent event) {
+ ViewParent parent = mParent;
+ if (parent == null) {
+ return false;
+ }
+ final boolean propagate = onRequestSendAccessibilityEvent(child, event);
+ 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}.
+ *
+ * @hide
+ */
+ public boolean onRequestSendAccessibilityEventInternal(View child, AccessibilityEvent event) {
+ return true;
+ }
+
+ /**
+ * Called when a child view has changed whether or not it is tracking transient state.
+ */
+ @Override
+ 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);
+ }
+ }
+ }
+
+ @Override
+ public boolean hasTransientState() {
+ return mChildCountWithTransientState > 0 || super.hasTransientState();
+ }
+
+ @Override
+ public boolean dispatchUnhandledMove(View focused, int direction) {
+ return mFocused != null &&
+ mFocused.dispatchUnhandledMove(focused, direction);
+ }
+
+ @Override
+ public void clearChildFocus(View child) {
+ if (DBG) {
+ System.out.println(this + " clearChildFocus()");
+ }
+
+ mFocused = null;
+ if (mParent != null) {
+ mParent.clearChildFocus(this);
+ }
+ }
+
+ @Override
+ public void clearFocus() {
+ if (DBG) {
+ System.out.println(this + " clearFocus()");
+ }
+ if (mFocused == null) {
+ super.clearFocus();
+ } else {
+ View focused = mFocused;
+ mFocused = null;
+ focused.clearFocus();
+ }
+ }
+
+ @Override
+ void unFocus(View focused) {
+ if (DBG) {
+ System.out.println(this + " unFocus()");
+ }
+ if (mFocused == null) {
+ super.unFocus(focused);
+ } else {
+ mFocused.unFocus(focused);
+ 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;
+ }
+
+ View getDeepestFocusedChild() {
+ View v = this;
+ while (v != null) {
+ if (v.isFocused()) {
+ return v;
+ }
+ v = v instanceof ViewGroup ? ((ViewGroup) v).getFocusedChild() : null;
+ }
+ return null;
+ }
+
+ /**
+ * Returns true if this view has or contains focus
+ *
+ * @return true if this view has or contains focus
+ */
+ @Override
+ public boolean hasFocus() {
+ return (mPrivateFlags & PFLAG_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;
+ }
+
+ @Override
+ boolean hasFocusable(boolean allowAutoFocus, boolean dispatchExplicit) {
+ // This should probably be super.hasFocusable, but that would change
+ // behavior. Historically, we have not checked the ancestor views for
+ // shouldBlockFocusForTouchscreen() in ViewGroup.hasFocusable.
+
+ // Invisible and gone views are never focusable.
+ if ((mViewFlags & VISIBILITY_MASK) != VISIBLE) {
+ return false;
+ }
+
+ // Only use effective focusable value when allowed.
+ if ((allowAutoFocus || getFocusable() != FOCUSABLE_AUTO) && isFocusable()) {
+ return true;
+ }
+
+ // Determine whether we have a focused descendant.
+ final int descendantFocusability = getDescendantFocusability();
+ if (descendantFocusability != FOCUS_BLOCK_DESCENDANTS) {
+ return hasFocusableChild(dispatchExplicit);
+ }
+
+ return false;
+ }
+
+ boolean hasFocusableChild(boolean dispatchExplicit) {
+ // Determine whether we have a focusable descendant.
+ final int count = mChildrenCount;
+ final View[] children = mChildren;
+
+ for (int i = 0; i < count; i++) {
+ final View child = children[i];
+
+ // In case the subclass has overridden has[Explicit]Focusable, dispatch
+ // to the expected one for each child even though we share logic here.
+ if ((dispatchExplicit && child.hasExplicitFocusable())
+ || (!dispatchExplicit && child.hasFocusable())) {
+ return true;
+ }
+ }
+
+ return false;
+ }
+
+ @Override
+ public void addFocusables(ArrayList<View> views, int direction, int focusableMode) {
+ final int focusableCount = views.size();
+
+ final int descendantFocusability = getDescendantFocusability();
+ final boolean blockFocusForTouchscreen = shouldBlockFocusForTouchscreen();
+ final boolean focusSelf = (isFocusableInTouchMode() || !blockFocusForTouchscreen);
+
+ if (descendantFocusability == FOCUS_BLOCK_DESCENDANTS) {
+ if (focusSelf) {
+ super.addFocusables(views, direction, focusableMode);
+ }
+ return;
+ }
+
+ if (blockFocusForTouchscreen) {
+ focusableMode |= FOCUSABLES_TOUCH_MODE;
+ }
+
+ if ((descendantFocusability == FOCUS_BEFORE_DESCENDANTS) && focusSelf) {
+ super.addFocusables(views, direction, focusableMode);
+ }
+
+ int count = 0;
+ final View[] children = new View[mChildrenCount];
+ for (int i = 0; i < mChildrenCount; ++i) {
+ View child = mChildren[i];
+ if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) {
+ children[count++] = child;
+ }
+ }
+ FocusFinder.sort(children, 0, count, this, isLayoutRtl());
+ for (int i = 0; i < count; ++i) {
+ children[i].addFocusables(views, direction, focusableMode);
+ }
+
+ // When set to FOCUS_AFTER_DESCENDANTS, we only add ourselves if
+ // there aren't any focusable descendants. 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) && focusSelf
+ && focusableCount == views.size()) {
+ super.addFocusables(views, direction, focusableMode);
+ }
+ }
+
+ @Override
+ public void addKeyboardNavigationClusters(Collection<View> views, int direction) {
+ final int focusableCount = views.size();
+
+ if (isKeyboardNavigationCluster()) {
+ // Cluster-navigation can enter a touchscreenBlocksFocus cluster, so temporarily
+ // disable touchscreenBlocksFocus to evaluate whether it contains focusables.
+ final boolean blockedFocus = getTouchscreenBlocksFocus();
+ try {
+ setTouchscreenBlocksFocusNoRefocus(false);
+ super.addKeyboardNavigationClusters(views, direction);
+ } finally {
+ setTouchscreenBlocksFocusNoRefocus(blockedFocus);
+ }
+ } else {
+ super.addKeyboardNavigationClusters(views, direction);
+ }
+
+ if (focusableCount != views.size()) {
+ // No need to look for groups inside a group.
+ return;
+ }
+
+ if (getDescendantFocusability() == FOCUS_BLOCK_DESCENDANTS) {
+ return;
+ }
+
+ int count = 0;
+ final View[] visibleChildren = new View[mChildrenCount];
+ for (int i = 0; i < mChildrenCount; ++i) {
+ final View child = mChildren[i];
+ if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) {
+ visibleChildren[count++] = child;
+ }
+ }
+ FocusFinder.sort(visibleChildren, 0, count, this, isLayoutRtl());
+ for (int i = 0; i < count; ++i) {
+ visibleChildren[i].addKeyboardNavigationClusters(views, direction);
+ }
+ }
+
+ /**
+ * Set whether this ViewGroup should ignore focus requests for itself and its children.
+ * If this option is enabled and the ViewGroup or a descendant currently has focus, focus
+ * will proceed forward.
+ *
+ * @param touchscreenBlocksFocus true to enable blocking focus in the presence of a touchscreen
+ */
+ public void setTouchscreenBlocksFocus(boolean touchscreenBlocksFocus) {
+ if (touchscreenBlocksFocus) {
+ mGroupFlags |= FLAG_TOUCHSCREEN_BLOCKS_FOCUS;
+ if (hasFocus() && !isKeyboardNavigationCluster()) {
+ final View focusedChild = getDeepestFocusedChild();
+ if (!focusedChild.isFocusableInTouchMode()) {
+ final View newFocus = focusSearch(FOCUS_FORWARD);
+ if (newFocus != null) {
+ newFocus.requestFocus();
+ }
+ }
+ }
+ } else {
+ mGroupFlags &= ~FLAG_TOUCHSCREEN_BLOCKS_FOCUS;
+ }
+ }
+
+ private void setTouchscreenBlocksFocusNoRefocus(boolean touchscreenBlocksFocus) {
+ if (touchscreenBlocksFocus) {
+ mGroupFlags |= FLAG_TOUCHSCREEN_BLOCKS_FOCUS;
+ } else {
+ mGroupFlags &= ~FLAG_TOUCHSCREEN_BLOCKS_FOCUS;
+ }
+ }
+
+ /**
+ * Check whether this ViewGroup should ignore focus requests for itself and its children.
+ */
+ @ViewDebug.ExportedProperty(category = "focus")
+ public boolean getTouchscreenBlocksFocus() {
+ return (mGroupFlags & FLAG_TOUCHSCREEN_BLOCKS_FOCUS) != 0;
+ }
+
+ boolean shouldBlockFocusForTouchscreen() {
+ // There is a special case for keyboard-navigation clusters. We allow cluster navigation
+ // to jump into blockFocusForTouchscreen ViewGroups which are clusters. Once in the
+ // cluster, focus is free to move around within it.
+ return getTouchscreenBlocksFocus() &&
+ mContext.getPackageManager().hasSystemFeature(PackageManager.FEATURE_TOUCHSCREEN)
+ && !(isKeyboardNavigationCluster()
+ && (hasFocus() || (findKeyboardNavigationCluster() != this)));
+ }
+
+ @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 & PFLAG_IS_ROOT_NAMESPACE) == 0) {
+ child.findViewsWithText(outViews, text, flags);
+ }
+ }
+ }
+
+ /** @hide */
+ @Override
+ public View findViewByAccessibilityIdTraversal(int accessibilityId) {
+ View foundView = super.findViewByAccessibilityIdTraversal(accessibilityId);
+ if (foundView != null) {
+ return foundView;
+ }
+
+ if (getAccessibilityNodeProvider() != null) {
+ return null;
+ }
+
+ 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;
+ }
+
+ /** @hide */
+ @Override
+ public View findViewByAutofillIdTraversal(int autofillId) {
+ View foundView = super.findViewByAutofillIdTraversal(autofillId);
+ 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.findViewByAutofillIdTraversal(autofillId);
+ if (foundView != null) {
+ return foundView;
+ }
+ }
+
+ return null;
+ }
+
+ @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);
+ }
+ }
+
+ @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);
+ }
+ }
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public void makeOptionalFitsSystemWindows() {
+ super.makeOptionalFitsSystemWindows();
+ final int count = mChildrenCount;
+ final View[] children = mChildren;
+ for (int i = 0; i < count; i++) {
+ children[i].makeOptionalFitsSystemWindows();
+ }
+ }
+
+ @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);
+ if (mTransitioningViews != null && mTransitioningViews.contains(child)) {
+ // 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);
+ addDisappearingView(child);
+ }
+ }
+ }
+
+ // in all cases, for drags
+ if (newVisibility == VISIBLE && mCurrentDragStartEvent != null) {
+ if (!mChildrenInterestedInDrag.contains(child)) {
+ notifyChildOfDragStart(child);
+ }
+ }
+ }
+
+ @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);
+ }
+ }
+
+ @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);
+ }
+ }
+
+ @Override
+ boolean dispatchVisibilityAggregated(boolean isVisible) {
+ isVisible = super.dispatchVisibilityAggregated(isVisible);
+ final int count = mChildrenCount;
+ final View[] children = mChildren;
+ for (int i = 0; i < count; i++) {
+ // Only dispatch to visible children. Not visible children and their subtrees already
+ // know that they aren't visible and that's not going to change as a result of
+ // whatever triggered this dispatch.
+ if (children[i].getVisibility() == VISIBLE) {
+ children[i].dispatchVisibilityAggregated(isVisible);
+ }
+ }
+ return isVisible;
+ }
+
+ @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);
+ }
+ }
+
+ @Override
+ public void recomputeViewAttributes(View child) {
+ if (mAttachInfo != null && !mAttachInfo.mRecomputeGlobalAttributes) {
+ ViewParent parent = mParent;
+ if (parent != null) parent.recomputeViewAttributes(this);
+ }
+ }
+
+ @Override
+ void dispatchCollectViewAttributes(AttachInfo attachInfo, int visibility) {
+ if ((visibility & VISIBILITY_MASK) == VISIBLE) {
+ super.dispatchCollectViewAttributes(attachInfo, visibility);
+ final int count = mChildrenCount;
+ final View[] children = mChildren;
+ for (int i = 0; i < count; i++) {
+ final View child = children[i];
+ child.dispatchCollectViewAttributes(attachInfo,
+ visibility | (child.mViewFlags&VISIBILITY_MASK));
+ }
+ }
+ }
+
+ @Override
+ public void bringChildToFront(View child) {
+ final int index = indexOfChild(child);
+ if (index >= 0) {
+ removeFromArray(index);
+ addInArray(child, mChildrenCount);
+ child.mParent = this;
+ requestLayout();
+ invalidate();
+ }
+ }
+
+ private PointF getLocalPoint() {
+ if (mLocalPoint == null) mLocalPoint = new PointF();
+ return mLocalPoint;
+ }
+
+ @Override
+ boolean dispatchDragEnterExitInPreN(DragEvent event) {
+ if (event.mAction == DragEvent.ACTION_DRAG_EXITED && mCurrentDragChild != null) {
+ // The drag exited a sub-tree of views; notify of the exit all descendants that are in
+ // entered state.
+ // We don't need this recursive delivery for ENTERED events because they get generated
+ // from the recursive delivery of LOCATION/DROP events, and hence, don't need their own
+ // recursion.
+ mCurrentDragChild.dispatchDragEnterExitInPreN(event);
+ mCurrentDragChild = null;
+ }
+ return mIsInterestedInDrag && super.dispatchDragEnterExitInPreN(event);
+ }
+
+ // TODO: Write real docs
+ @Override
+ public boolean dispatchDragEvent(DragEvent event) {
+ boolean retval = false;
+ final float tx = event.mX;
+ final float ty = event.mY;
+ final ClipData td = event.mClipData;
+
+ // Dispatch down the view hierarchy
+ final PointF localPoint = getLocalPoint();
+
+ switch (event.mAction) {
+ case DragEvent.ACTION_DRAG_STARTED: {
+ // Clear the state to recalculate which views we drag over.
+ mCurrentDragChild = null;
+
+ // Set up our tracking of drag-started notifications
+ mCurrentDragStartEvent = DragEvent.obtain(event);
+ if (mChildrenInterestedInDrag == null) {
+ mChildrenInterestedInDrag = new HashSet<View>();
+ } else {
+ mChildrenInterestedInDrag.clear();
+ }
+
+ // Now dispatch down to our children, caching the responses
+ 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) {
+ if (notifyChildOfDragStart(children[i])) {
+ retval = true;
+ }
+ }
+ }
+
+ // Notify itself of the drag start.
+ mIsInterestedInDrag = super.dispatchDragEvent(event);
+ if (mIsInterestedInDrag) {
+ retval = true;
+ }
+
+ if (!retval) {
+ // Neither us nor any of our children are interested in this drag, so stop tracking
+ // the current drag event.
+ mCurrentDragStartEvent.recycle();
+ mCurrentDragStartEvent = null;
+ }
+ } break;
+
+ case DragEvent.ACTION_DRAG_ENDED: {
+ // Release the bookkeeping now that the drag lifecycle has ended
+ final HashSet<View> childrenInterestedInDrag = mChildrenInterestedInDrag;
+ if (childrenInterestedInDrag != null) {
+ for (View child : childrenInterestedInDrag) {
+ // If a child was interested in the ongoing drag, it's told that it's over
+ if (child.dispatchDragEvent(event)) {
+ retval = true;
+ }
+ }
+ childrenInterestedInDrag.clear();
+ }
+ if (mCurrentDragStartEvent != null) {
+ mCurrentDragStartEvent.recycle();
+ mCurrentDragStartEvent = null;
+ }
+
+ if (mIsInterestedInDrag) {
+ if (super.dispatchDragEvent(event)) {
+ retval = true;
+ }
+ mIsInterestedInDrag = false;
+ }
+ } break;
+
+ case DragEvent.ACTION_DRAG_LOCATION:
+ case DragEvent.ACTION_DROP: {
+ // Find the [possibly new] drag target
+ View target = findFrontmostDroppableChildAt(event.mX, event.mY, localPoint);
+
+ if (target != mCurrentDragChild) {
+ if (sCascadedDragDrop) {
+ // For pre-Nougat apps, make sure that the whole hierarchy of views that contain
+ // the drag location is kept in the state between ENTERED and EXITED events.
+ // (Starting with N, only the innermost view will be in that state).
+
+ final int action = event.mAction;
+ // Position should not be available for ACTION_DRAG_ENTERED and
+ // ACTION_DRAG_EXITED.
+ event.mX = 0;
+ event.mY = 0;
+ event.mClipData = null;
+
+ if (mCurrentDragChild != null) {
+ event.mAction = DragEvent.ACTION_DRAG_EXITED;
+ mCurrentDragChild.dispatchDragEnterExitInPreN(event);
+ }
+
+ if (target != null) {
+ event.mAction = DragEvent.ACTION_DRAG_ENTERED;
+ target.dispatchDragEnterExitInPreN(event);
+ }
+
+ event.mAction = action;
+ event.mX = tx;
+ event.mY = ty;
+ event.mClipData = td;
+ }
+ mCurrentDragChild = target;
+ }
+
+ if (target == null && mIsInterestedInDrag) {
+ target = this;
+ }
+
+ // Dispatch the actual drag notice, localized into the target coordinates.
+ if (target != null) {
+ if (target != this) {
+ event.mX = localPoint.x;
+ event.mY = localPoint.y;
+
+ retval = target.dispatchDragEvent(event);
+
+ event.mX = tx;
+ event.mY = ty;
+
+ if (mIsInterestedInDrag) {
+ final boolean eventWasConsumed;
+ if (sCascadedDragDrop) {
+ eventWasConsumed = retval;
+ } else {
+ eventWasConsumed = event.mEventHandlerWasCalled;
+ }
+
+ if (!eventWasConsumed) {
+ retval = super.dispatchDragEvent(event);
+ }
+ }
+ } else {
+ retval = super.dispatchDragEvent(event);
+ }
+ }
+ } break;
+ }
+
+ 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 notifyChildOfDragStart(View child) {
+ // The caller guarantees that the child is not in mChildrenInterestedInDrag yet.
+
+ if (ViewDebug.DEBUG_DRAG) {
+ Log.d(View.VIEW_LOG_TAG, "Sending drag-started to view: " + child);
+ }
+
+ final float tx = mCurrentDragStartEvent.mX;
+ final float ty = mCurrentDragStartEvent.mY;
+
+ final float[] point = getTempPoint();
+ point[0] = tx;
+ point[1] = ty;
+ transformPointToViewLocal(point, child);
+
+ mCurrentDragStartEvent.mX = point[0];
+ mCurrentDragStartEvent.mY = point[1];
+ final boolean canAccept = child.dispatchDragEvent(mCurrentDragStartEvent);
+ mCurrentDragStartEvent.mX = tx;
+ mCurrentDragStartEvent.mY = ty;
+ mCurrentDragStartEvent.mEventHandlerWasCalled = false;
+ if (canAccept) {
+ mChildrenInterestedInDrag.add(child);
+ if (!child.canAcceptDrag()) {
+ child.mPrivateFlags2 |= View.PFLAG2_DRAG_CAN_ACCEPT;
+ child.refreshDrawableState();
+ }
+ }
+ return canAccept;
+ }
+
+ @Override
+ public void dispatchWindowSystemUiVisiblityChanged(int visible) {
+ super.dispatchWindowSystemUiVisiblityChanged(visible);
+
+ final int count = mChildrenCount;
+ final View[] children = mChildren;
+ for (int i=0; i <count; i++) {
+ final View child = children[i];
+ child.dispatchWindowSystemUiVisiblityChanged(visible);
+ }
+ }
+
+ @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
+ boolean updateLocalSystemUiVisibility(int localValue, int localChanges) {
+ boolean changed = super.updateLocalSystemUiVisibility(localValue, localChanges);
+
+ final int count = mChildrenCount;
+ final View[] children = mChildren;
+ for (int i=0; i <count; i++) {
+ final View child = children[i];
+ changed |= child.updateLocalSystemUiVisibility(localValue, localChanges);
+ }
+ return changed;
+ }
+
+ @Override
+ public boolean dispatchKeyEventPreIme(KeyEvent event) {
+ if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS))
+ == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) {
+ return super.dispatchKeyEventPreIme(event);
+ } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS)
+ == PFLAG_HAS_BOUNDS) {
+ return mFocused.dispatchKeyEventPreIme(event);
+ }
+ return false;
+ }
+
+ @Override
+ public boolean dispatchKeyEvent(KeyEvent event) {
+ if (mInputEventConsistencyVerifier != null) {
+ mInputEventConsistencyVerifier.onKeyEvent(event, 1);
+ }
+
+ if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS))
+ == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) {
+ if (super.dispatchKeyEvent(event)) {
+ return true;
+ }
+ } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS)
+ == PFLAG_HAS_BOUNDS) {
+ if (mFocused.dispatchKeyEvent(event)) {
+ return true;
+ }
+ }
+
+ if (mInputEventConsistencyVerifier != null) {
+ mInputEventConsistencyVerifier.onUnhandledEvent(event, 1);
+ }
+ return false;
+ }
+
+ @Override
+ public boolean dispatchKeyShortcutEvent(KeyEvent event) {
+ if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS))
+ == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) {
+ return super.dispatchKeyShortcutEvent(event);
+ } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS)
+ == PFLAG_HAS_BOUNDS) {
+ return mFocused.dispatchKeyShortcutEvent(event);
+ }
+ return false;
+ }
+
+ @Override
+ public boolean dispatchTrackballEvent(MotionEvent event) {
+ if (mInputEventConsistencyVerifier != null) {
+ mInputEventConsistencyVerifier.onTrackballEvent(event, 1);
+ }
+
+ if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS))
+ == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) {
+ if (super.dispatchTrackballEvent(event)) {
+ return true;
+ }
+ } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS)
+ == PFLAG_HAS_BOUNDS) {
+ if (mFocused.dispatchTrackballEvent(event)) {
+ return true;
+ }
+ }
+
+ if (mInputEventConsistencyVerifier != null) {
+ mInputEventConsistencyVerifier.onUnhandledEvent(event, 1);
+ }
+ return false;
+ }
+
+ @Override
+ public boolean dispatchCapturedPointerEvent(MotionEvent event) {
+ if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS))
+ == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) {
+ if (super.dispatchCapturedPointerEvent(event)) {
+ return true;
+ }
+ } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS)
+ == PFLAG_HAS_BOUNDS) {
+ if (mFocused.dispatchCapturedPointerEvent(event)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ @Override
+ public void dispatchPointerCaptureChanged(boolean hasCapture) {
+ exitHoverTargets();
+
+ super.dispatchPointerCaptureChanged(hasCapture);
+ final int count = mChildrenCount;
+ final View[] children = mChildren;
+ for (int i = 0; i < count; i++) {
+ children[i].dispatchPointerCaptureChanged(hasCapture);
+ }
+ }
+
+ @Override
+ public PointerIcon onResolvePointerIcon(MotionEvent event, int pointerIndex) {
+ final float x = event.getX(pointerIndex);
+ final float y = event.getY(pointerIndex);
+ if (isOnScrollbarThumb(x, y) || isDraggingScrollBar()) {
+ return PointerIcon.getSystemIcon(mContext, PointerIcon.TYPE_ARROW);
+ }
+ // Check what the child under the pointer says about the pointer.
+ final int childrenCount = mChildrenCount;
+ if (childrenCount != 0) {
+ final ArrayList<View> preorderedList = buildOrderedChildList();
+ final boolean customOrder = preorderedList == null
+ && isChildrenDrawingOrderEnabled();
+ final View[] children = mChildren;
+ for (int i = childrenCount - 1; i >= 0; i--) {
+ final int childIndex = getAndVerifyPreorderedIndex(childrenCount, i, customOrder);
+ final View child = getAndVerifyPreorderedView(preorderedList, children, childIndex);
+ if (!canViewReceivePointerEvents(child)
+ || !isTransformedTouchPointInView(x, y, child, null)) {
+ continue;
+ }
+ final PointerIcon pointerIcon =
+ dispatchResolvePointerIcon(event, pointerIndex, child);
+ if (pointerIcon != null) {
+ if (preorderedList != null) preorderedList.clear();
+ return pointerIcon;
+ }
+ }
+ if (preorderedList != null) preorderedList.clear();
+ }
+
+ // The pointer is not a child or the child has no preferences, returning the default
+ // implementation.
+ return super.onResolvePointerIcon(event, pointerIndex);
+ }
+
+ private PointerIcon dispatchResolvePointerIcon(MotionEvent event, int pointerIndex,
+ View child) {
+ final PointerIcon pointerIcon;
+ if (!child.hasIdentityMatrix()) {
+ MotionEvent transformedEvent = getTransformedMotionEvent(event, child);
+ pointerIcon = child.onResolvePointerIcon(transformedEvent, pointerIndex);
+ transformedEvent.recycle();
+ } else {
+ final float offsetX = mScrollX - child.mLeft;
+ final float offsetY = mScrollY - child.mTop;
+ event.offsetLocation(offsetX, offsetY);
+ pointerIcon = child.onResolvePointerIcon(event, pointerIndex);
+ event.offsetLocation(-offsetX, -offsetY);
+ }
+ return pointerIcon;
+ }
+
+ private int getAndVerifyPreorderedIndex(int childrenCount, int i, boolean customOrder) {
+ final int childIndex;
+ if (customOrder) {
+ final int childIndex1 = getChildDrawingOrder(childrenCount, i);
+ if (childIndex1 >= childrenCount) {
+ throw new IndexOutOfBoundsException("getChildDrawingOrder() "
+ + "returned invalid index " + childIndex1
+ + " (child count is " + childrenCount + ")");
+ }
+ childIndex = childIndex1;
+ } else {
+ childIndex = i;
+ }
+ return childIndex;
+ }
+
+ @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 ArrayList<View> preorderedList = buildOrderedChildList();
+ final boolean customOrder = preorderedList == null
+ && isChildrenDrawingOrderEnabled();
+ final View[] children = mChildren;
+ HoverTarget lastHoverTarget = null;
+ for (int i = childrenCount - 1; i >= 0; i--) {
+ final int childIndex = getAndVerifyPreorderedIndex(
+ childrenCount, i, customOrder);
+ final View child = getAndVerifyPreorderedView(
+ preorderedList, children, childIndex);
+ 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 {
+ mFirstHoverTarget = hoverTarget;
+ }
+ lastHoverTarget = 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;
+ }
+ }
+ if (preorderedList != null) preorderedList.clear();
+ }
+ }
+
+ // 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) {
+ final boolean hoverExitPending = event.isHoverExitPending();
+ event.setHoverExitPending(true);
+ dispatchTransformedGenericPointerEvent(
+ event, child); // move
+ event.setHoverExitPending(hoverExitPending);
+ }
+ 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 and the view group
+ // itself is not currently being hover-exited.
+ boolean newHoveredSelf = !handled &&
+ (action != MotionEvent.ACTION_HOVER_EXIT) && !event.isHoverExitPending();
+ 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;
+ }
+
+ private void exitHoverTargets() {
+ if (mHoveredSelf || mFirstHoverTarget != null) {
+ final long now = SystemClock.uptimeMillis();
+ MotionEvent event = MotionEvent.obtain(now, now,
+ MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0);
+ event.setSource(InputDevice.SOURCE_TOUCHSCREEN);
+ dispatchHoverEvent(event);
+ event.recycle();
+ }
+ }
+
+ private void cancelHoverTarget(View view) {
+ HoverTarget predecessor = null;
+ HoverTarget target = mFirstHoverTarget;
+ while (target != null) {
+ final HoverTarget next = target.next;
+ if (target.child == view) {
+ if (predecessor == null) {
+ mFirstHoverTarget = next;
+ } else {
+ predecessor.next = next;
+ }
+ target.recycle();
+
+ final long now = SystemClock.uptimeMillis();
+ MotionEvent event = MotionEvent.obtain(now, now,
+ MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0);
+ event.setSource(InputDevice.SOURCE_TOUCHSCREEN);
+ view.dispatchHoverEvent(event);
+ event.recycle();
+ return;
+ }
+ predecessor = target;
+ target = next;
+ }
+ }
+
+ @Override
+ boolean dispatchTooltipHoverEvent(MotionEvent event) {
+ final int action = event.getAction();
+ switch (action) {
+ case MotionEvent.ACTION_HOVER_ENTER:
+ break;
+
+ case MotionEvent.ACTION_HOVER_MOVE:
+ View newTarget = null;
+
+ // Check what the child under the pointer says about the tooltip.
+ final int childrenCount = mChildrenCount;
+ if (childrenCount != 0) {
+ final float x = event.getX();
+ final float y = event.getY();
+
+ final ArrayList<View> preorderedList = buildOrderedChildList();
+ final boolean customOrder = preorderedList == null
+ && isChildrenDrawingOrderEnabled();
+ final View[] children = mChildren;
+ for (int i = childrenCount - 1; i >= 0; i--) {
+ final int childIndex =
+ getAndVerifyPreorderedIndex(childrenCount, i, customOrder);
+ final View child =
+ getAndVerifyPreorderedView(preorderedList, children, childIndex);
+ if (!canViewReceivePointerEvents(child)
+ || !isTransformedTouchPointInView(x, y, child, null)) {
+ continue;
+ }
+ if (dispatchTooltipHoverEvent(event, child)) {
+ newTarget = child;
+ break;
+ }
+ }
+ if (preorderedList != null) preorderedList.clear();
+ }
+
+ if (mTooltipHoverTarget != newTarget) {
+ if (mTooltipHoverTarget != null) {
+ event.setAction(MotionEvent.ACTION_HOVER_EXIT);
+ mTooltipHoverTarget.dispatchTooltipHoverEvent(event);
+ event.setAction(action);
+ }
+ mTooltipHoverTarget = newTarget;
+ }
+
+ if (mTooltipHoverTarget != null) {
+ if (mTooltipHoveredSelf) {
+ mTooltipHoveredSelf = false;
+ event.setAction(MotionEvent.ACTION_HOVER_EXIT);
+ super.dispatchTooltipHoverEvent(event);
+ event.setAction(action);
+ }
+ return true;
+ }
+
+ mTooltipHoveredSelf = super.dispatchTooltipHoverEvent(event);
+ return mTooltipHoveredSelf;
+
+ case MotionEvent.ACTION_HOVER_EXIT:
+ if (mTooltipHoverTarget != null) {
+ mTooltipHoverTarget.dispatchTooltipHoverEvent(event);
+ mTooltipHoverTarget = null;
+ } else if (mTooltipHoveredSelf) {
+ super.dispatchTooltipHoverEvent(event);
+ mTooltipHoveredSelf = false;
+ }
+ break;
+ }
+ return false;
+ }
+
+ private boolean dispatchTooltipHoverEvent(MotionEvent event, View child) {
+ final boolean result;
+ if (!child.hasIdentityMatrix()) {
+ MotionEvent transformedEvent = getTransformedMotionEvent(event, child);
+ result = child.dispatchTooltipHoverEvent(transformedEvent);
+ transformedEvent.recycle();
+ } else {
+ final float offsetX = mScrollX - child.mLeft;
+ final float offsetY = mScrollY - child.mTop;
+ event.offsetLocation(offsetX, offsetY);
+ result = child.dispatchTooltipHoverEvent(event);
+ event.offsetLocation(-offsetX, -offsetY);
+ }
+ return result;
+ }
+
+ private void exitTooltipHoverTargets() {
+ if (mTooltipHoveredSelf || mTooltipHoverTarget != null) {
+ final long now = SystemClock.uptimeMillis();
+ MotionEvent event = MotionEvent.obtain(now, now,
+ MotionEvent.ACTION_HOVER_EXIT, 0.0f, 0.0f, 0);
+ event.setSource(InputDevice.SOURCE_TOUCHSCREEN);
+ dispatchTooltipHoverEvent(event);
+ event.recycle();
+ }
+ }
+
+ /** @hide */
+ @Override
+ protected boolean hasHoveredChild() {
+ return mFirstHoverTarget != null;
+ }
+
+ @Override
+ public void addChildrenForAccessibility(ArrayList<View> outChildren) {
+ if (getAccessibilityNodeProvider() != null) {
+ return;
+ }
+ ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true);
+ try {
+ final int childrenCount = children.getChildCount();
+ for (int i = 0; i < childrenCount; i++) {
+ View child = children.getChildAt(i);
+ if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) {
+ if (child.includeForAccessibility()) {
+ outChildren.add(child);
+ } else {
+ child.addChildrenForAccessibility(outChildren);
+ }
+ }
+ }
+ } finally {
+ children.recycle();
+ }
+ }
+
+ /**
+ * 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 handles mouse hover on the scroll bars.
+ * </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) {
+ if (event.isFromSource(InputDevice.SOURCE_MOUSE)) {
+ final int action = event.getAction();
+ final float x = event.getX();
+ final float y = event.getY();
+ if ((action == MotionEvent.ACTION_HOVER_MOVE
+ || action == MotionEvent.ACTION_HOVER_ENTER) && isOnScrollbar(x, y)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) {
+ if (event.getHistorySize() == 0) {
+ return event;
+ }
+ return MotionEvent.obtainNoHistory(event);
+ }
+
+ @Override
+ protected boolean dispatchGenericPointerEvent(MotionEvent event) {
+ // Send the event to the child under the pointer.
+ final int childrenCount = mChildrenCount;
+ if (childrenCount != 0) {
+ final float x = event.getX();
+ final float y = event.getY();
+
+ final ArrayList<View> preorderedList = buildOrderedChildList();
+ final boolean customOrder = preorderedList == null
+ && isChildrenDrawingOrderEnabled();
+ final View[] children = mChildren;
+ for (int i = childrenCount - 1; i >= 0; i--) {
+ final int childIndex = getAndVerifyPreorderedIndex(childrenCount, i, customOrder);
+ final View child = getAndVerifyPreorderedView(preorderedList, children, childIndex);
+ if (!canViewReceivePointerEvents(child)
+ || !isTransformedTouchPointInView(x, y, child, null)) {
+ continue;
+ }
+
+ if (dispatchTransformedGenericPointerEvent(event, child)) {
+ if (preorderedList != null) preorderedList.clear();
+ return true;
+ }
+ }
+ if (preorderedList != null) preorderedList.clear();
+ }
+
+ // No child handled the event. Send it to this view group.
+ return super.dispatchGenericPointerEvent(event);
+ }
+
+ @Override
+ protected boolean dispatchGenericFocusedEvent(MotionEvent event) {
+ // Send the event to the focused child or to this view group if it has focus.
+ if ((mPrivateFlags & (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS))
+ == (PFLAG_FOCUSED | PFLAG_HAS_BOUNDS)) {
+ return super.dispatchGenericFocusedEvent(event);
+ } else if (mFocused != null && (mFocused.mPrivateFlags & PFLAG_HAS_BOUNDS)
+ == PFLAG_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) {
+ boolean handled;
+ if (!child.hasIdentityMatrix()) {
+ MotionEvent transformedEvent = getTransformedMotionEvent(event, child);
+ handled = child.dispatchGenericMotionEvent(transformedEvent);
+ transformedEvent.recycle();
+ } else {
+ final float offsetX = mScrollX - child.mLeft;
+ final float offsetY = mScrollY - child.mTop;
+ event.offsetLocation(offsetX, offsetY);
+ handled = child.dispatchGenericMotionEvent(event);
+ event.offsetLocation(-offsetX, -offsetY);
+ }
+ return handled;
+ }
+
+ /**
+ * Returns a MotionEvent that's been transformed into the child's local coordinates.
+ *
+ * It's the responsibility of the caller to recycle it once they're finished with it.
+ * @param event The event to transform.
+ * @param child The view whose coordinate space is to be used.
+ * @return A copy of the the given MotionEvent, transformed into the given View's coordinate
+ * space.
+ */
+ private MotionEvent getTransformedMotionEvent(MotionEvent event, View child) {
+ final float offsetX = mScrollX - child.mLeft;
+ final float offsetY = mScrollY - child.mTop;
+ final MotionEvent transformedEvent = MotionEvent.obtain(event);
+ transformedEvent.offsetLocation(offsetX, offsetY);
+ if (!child.hasIdentityMatrix()) {
+ transformedEvent.transform(child.getInverseMatrix());
+ }
+ return transformedEvent;
+ }
+
+ @Override
+ public boolean dispatchTouchEvent(MotionEvent ev) {
+ if (mInputEventConsistencyVerifier != null) {
+ mInputEventConsistencyVerifier.onTouchEvent(ev, 1);
+ }
+
+ // If the event targets the accessibility focused view and this is it, start
+ // normal event dispatch. Maybe a descendant is what will handle the click.
+ if (ev.isTargetAccessibilityFocus() && isAccessibilityFocusedViewOrHost()) {
+ ev.setTargetAccessibilityFocus(false);
+ }
+
+ 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;
+ }
+
+ // If intercepted, start normal event dispatch. Also if there is already
+ // a view that is handling the gesture, do normal event dispatch.
+ if (intercepted || mFirstTouchTarget != null) {
+ ev.setTargetAccessibilityFocus(false);
+ }
+
+ // 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 the event is targeting accessiiblity focus we give it to the
+ // view that has accessibility focus and if it does not handle it
+ // we clear the flag and dispatch the event to all children as usual.
+ // We are looking up the accessibility focused host to avoid keeping
+ // state since these events are very rare.
+ View childWithAccessibilityFocus = ev.isTargetAccessibilityFocus()
+ ? findChildWithAccessibilityFocus() : null;
+
+ 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 (newTouchTarget == null && childrenCount != 0) {
+ final float x = ev.getX(actionIndex);
+ final float y = ev.getY(actionIndex);
+ // Find a child that can receive the event.
+ // Scan children from front to back.
+ final ArrayList<View> preorderedList = buildTouchDispatchChildList();
+ final boolean customOrder = preorderedList == null
+ && isChildrenDrawingOrderEnabled();
+ final View[] children = mChildren;
+ for (int i = childrenCount - 1; i >= 0; i--) {
+ final int childIndex = getAndVerifyPreorderedIndex(
+ childrenCount, i, customOrder);
+ final View child = getAndVerifyPreorderedView(
+ preorderedList, children, childIndex);
+
+ // If there is a view that has accessibility focus we want it
+ // to get the event first and if not handled we will perform a
+ // normal dispatch. We may do a double iteration but this is
+ // safer given the timeframe.
+ if (childWithAccessibilityFocus != null) {
+ if (childWithAccessibilityFocus != child) {
+ continue;
+ }
+ childWithAccessibilityFocus = null;
+ i = childrenCount - 1;
+ }
+
+ if (!canViewReceivePointerEvents(child)
+ || !isTransformedTouchPointInView(x, y, child, null)) {
+ ev.setTargetAccessibilityFocus(false);
+ 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();
+ if (preorderedList != null) {
+ // childIndex points into presorted list, find original index
+ for (int j = 0; j < childrenCount; j++) {
+ if (children[childIndex] == mChildren[j]) {
+ mLastTouchDownIndex = j;
+ break;
+ }
+ }
+ } else {
+ mLastTouchDownIndex = childIndex;
+ }
+ mLastTouchDownX = ev.getX();
+ mLastTouchDownY = ev.getY();
+ newTouchTarget = addTouchTarget(child, idBitsToAssign);
+ alreadyDispatchedToNewTouchTarget = true;
+ break;
+ }
+
+ // The accessibility focus didn't handle the event, so clear
+ // the flag and do a normal dispatch to all children.
+ ev.setTargetAccessibilityFocus(false);
+ }
+ if (preorderedList != null) preorderedList.clear();
+ }
+
+ 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;
+ }
+
+ /**
+ * Provide custom ordering of views in which the touch will be dispatched.
+ *
+ * This is called within a tight loop, so you are not allowed to allocate objects, including
+ * the return array. Instead, you should return a pre-allocated list that will be cleared
+ * after the dispatch is finished.
+ * @hide
+ */
+ public ArrayList<View> buildTouchDispatchChildList() {
+ return buildOrderedChildList();
+ }
+
+ /**
+ * Finds the child which has accessibility focus.
+ *
+ * @return The child that has focus.
+ */
+ private View findChildWithAccessibilityFocus() {
+ ViewRootImpl viewRoot = getViewRootImpl();
+ if (viewRoot == null) {
+ return null;
+ }
+
+ View current = viewRoot.getAccessibilityFocusedHost();
+ if (current == null) {
+ return null;
+ }
+
+ ViewParent parent = current.getParent();
+ while (parent instanceof View) {
+ if (parent == this) {
+ return current;
+ }
+ current = (View) parent;
+ parent = current.getParent();
+ }
+
+ return null;
+ }
+
+ /**
+ * Resets all touch state in preparation for a new cycle.
+ */
+ private void resetTouchState() {
+ clearTouchTargets();
+ resetCancelNextUpFlag(this);
+ mGroupFlags &= ~FLAG_DISALLOW_INTERCEPT;
+ mNestedScrollAxes = SCROLL_AXIS_NONE;
+ }
+
+ /**
+ * Resets the cancel next up flag.
+ * Returns true if the flag was previously set.
+ */
+ private static boolean resetCancelNextUpFlag(@NonNull View view) {
+ if ((view.mPrivateFlags & PFLAG_CANCEL_NEXT_UP_EVENT) != 0) {
+ view.mPrivateFlags &= ~PFLAG_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(@NonNull 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(@NonNull View child, int pointerIdBits) {
+ final 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;
+ }
+ }
+
+ private void cancelTouchTarget(View view) {
+ TouchTarget predecessor = null;
+ TouchTarget target = mFirstTouchTarget;
+ while (target != null) {
+ final TouchTarget next = target.next;
+ if (target.child == view) {
+ if (predecessor == null) {
+ mFirstTouchTarget = next;
+ } else {
+ predecessor.next = next;
+ }
+ target.recycle();
+
+ final long now = SystemClock.uptimeMillis();
+ MotionEvent event = MotionEvent.obtain(now, now,
+ MotionEvent.ACTION_CANCEL, 0.0f, 0.0f, 0);
+ event.setSource(InputDevice.SOURCE_TOUCHSCREEN);
+ view.dispatchTouchEvent(event);
+ event.recycle();
+ return;
+ }
+ predecessor = target;
+ target = next;
+ }
+ }
+
+ /**
+ * Returns true if a child view can receive pointer events.
+ * @hide
+ */
+ private static boolean canViewReceivePointerEvents(@NonNull View child) {
+ return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE
+ || child.getAnimation() != null;
+ }
+
+ private float[] getTempPoint() {
+ if (mTempPoint == null) {
+ mTempPoint = new float[2];
+ }
+ return mTempPoint;
+ }
+
+ /**
+ * 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) {
+ final float[] point = getTempPoint();
+ point[0] = x;
+ point[1] = y;
+ transformPointToViewLocal(point, child);
+ final boolean isInView = child.pointInView(point[0], point[1]);
+ if (isInView && outLocalPoint != null) {
+ outLocalPoint.set(point[0], point[1]);
+ }
+ return isInView;
+ }
+
+ /**
+ * @hide
+ */
+ public void transformPointToViewLocal(float[] point, View child) {
+ point[0] += mScrollX - child.mLeft;
+ point[1] += mScrollY - child.mTop;
+
+ if (!child.hasIdentityMatrix()) {
+ child.getInverseMatrix().mapPoints(point);
+ }
+ }
+
+ /**
+ * 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.
+ * @attr ref android.R.styleable#ViewGroup_splitMotionEvents
+ */
+ 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;
+ }
+
+ /**
+ * Returns true if this ViewGroup should be considered as a single entity for removal
+ * when executing an Activity transition. If this is false, child elements will move
+ * individually during the transition.
+ *
+ * @return True if the ViewGroup should be acted on together during an Activity transition.
+ * The default value is true when there is a non-null background or if
+ * {@link #getTransitionName()} is not null or if a
+ * non-null {@link android.view.ViewOutlineProvider} other than
+ * {@link android.view.ViewOutlineProvider#BACKGROUND} was given to
+ * {@link #setOutlineProvider(ViewOutlineProvider)} and false otherwise.
+ */
+ public boolean isTransitionGroup() {
+ if ((mGroupFlags & FLAG_IS_TRANSITION_GROUP_SET) != 0) {
+ return ((mGroupFlags & FLAG_IS_TRANSITION_GROUP) != 0);
+ } else {
+ final ViewOutlineProvider outlineProvider = getOutlineProvider();
+ return getBackground() != null || getTransitionName() != null ||
+ (outlineProvider != null && outlineProvider != ViewOutlineProvider.BACKGROUND);
+ }
+ }
+
+ /**
+ * Changes whether or not this ViewGroup should be treated as a single entity during
+ * Activity Transitions.
+ * @param isTransitionGroup Whether or not the ViewGroup should be treated as a unit
+ * in Activity transitions. If false, the ViewGroup won't transition,
+ * only its children. If true, the entire ViewGroup will transition
+ * together.
+ * @see android.app.ActivityOptions#makeSceneTransitionAnimation(android.app.Activity,
+ * android.util.Pair[])
+ */
+ public void setTransitionGroup(boolean isTransitionGroup) {
+ mGroupFlags |= FLAG_IS_TRANSITION_GROUP_SET;
+ if (isTransitionGroup) {
+ mGroupFlags |= FLAG_IS_TRANSITION_GROUP;
+ } else {
+ mGroupFlags &= ~FLAG_IS_TRANSITION_GROUP;
+ }
+ }
+
+ @Override
+ 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) {
+ if (ev.isFromSource(InputDevice.SOURCE_MOUSE)
+ && ev.getAction() == MotionEvent.ACTION_DOWN
+ && ev.isButtonPressed(MotionEvent.BUTTON_PRIMARY)
+ && isOnScrollbarThumb(ev.getX(), ev.getY())) {
+ return true;
+ }
+ 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;
+ }
+
+ @Override
+ public boolean restoreDefaultFocus() {
+ if (mDefaultFocus != null
+ && getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS
+ && (mDefaultFocus.mViewFlags & VISIBILITY_MASK) == VISIBLE
+ && mDefaultFocus.restoreDefaultFocus()) {
+ return true;
+ }
+ return super.restoreDefaultFocus();
+ }
+
+ /**
+ * @hide
+ */
+ @TestApi
+ @Override
+ public boolean restoreFocusInCluster(@FocusRealDirection int direction) {
+ // Allow cluster-navigation to enter touchscreenBlocksFocus ViewGroups.
+ if (isKeyboardNavigationCluster()) {
+ final boolean blockedFocus = getTouchscreenBlocksFocus();
+ try {
+ setTouchscreenBlocksFocusNoRefocus(false);
+ return restoreFocusInClusterInternal(direction);
+ } finally {
+ setTouchscreenBlocksFocusNoRefocus(blockedFocus);
+ }
+ } else {
+ return restoreFocusInClusterInternal(direction);
+ }
+ }
+
+ private boolean restoreFocusInClusterInternal(@FocusRealDirection int direction) {
+ if (mFocusedInCluster != null && getDescendantFocusability() != FOCUS_BLOCK_DESCENDANTS
+ && (mFocusedInCluster.mViewFlags & VISIBILITY_MASK) == VISIBLE
+ && mFocusedInCluster.restoreFocusInCluster(direction)) {
+ return true;
+ }
+ return super.restoreFocusInCluster(direction);
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public boolean restoreFocusNotInCluster() {
+ if (mFocusedInCluster != null) {
+ // since clusters don't nest; we can assume that a non-null mFocusedInCluster
+ // will refer to a view not-in a cluster.
+ return restoreFocusInCluster(View.FOCUS_DOWN);
+ }
+ if (isKeyboardNavigationCluster() || (mViewFlags & VISIBILITY_MASK) != VISIBLE) {
+ return false;
+ }
+ int descendentFocusability = getDescendantFocusability();
+ if (descendentFocusability == FOCUS_BLOCK_DESCENDANTS) {
+ return super.requestFocus(FOCUS_DOWN, null);
+ }
+ if (descendentFocusability == FOCUS_BEFORE_DESCENDANTS
+ && super.requestFocus(FOCUS_DOWN, null)) {
+ return true;
+ }
+ for (int i = 0; i < mChildrenCount; ++i) {
+ View child = mChildren[i];
+ if (!child.isKeyboardNavigationCluster()
+ && child.restoreFocusNotInCluster()) {
+ return true;
+ }
+ }
+ if (descendentFocusability == FOCUS_AFTER_DESCENDANTS && !hasFocusableChild(false)) {
+ return super.requestFocus(FOCUS_DOWN, null);
+ }
+ 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();
+ }
+ }
+
+ @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;
+
+ final int count = mChildrenCount;
+ final View[] children = mChildren;
+ for (int i = 0; i < count; i++) {
+ final View child = children[i];
+ child.dispatchAttachedToWindow(info,
+ combineVisibility(visibility, child.getVisibility()));
+ }
+ final int transientCount = mTransientIndices == null ? 0 : mTransientIndices.size();
+ for (int i = 0; i < transientCount; ++i) {
+ View view = mTransientViews.get(i);
+ view.dispatchAttachedToWindow(info,
+ combineVisibility(visibility, view.getVisibility()));
+ }
+ }
+
+ @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
+ void dispatchMovedToDisplay(Display display, Configuration config) {
+ super.dispatchMovedToDisplay(display, config);
+
+ final int count = mChildrenCount;
+ final View[] children = mChildren;
+ for (int i = 0; i < count; i++) {
+ children[i].dispatchMovedToDisplay(display, config);
+ }
+ }
+
+ /** @hide */
+ @Override
+ public boolean dispatchPopulateAccessibilityEventInternal(AccessibilityEvent event) {
+ boolean handled = false;
+ if (includeForAccessibility()) {
+ handled = super.dispatchPopulateAccessibilityEventInternal(event);
+ if (handled) {
+ return handled;
+ }
+ }
+ // Let our children have a shot in populating the event.
+ ChildListForAccessibility children = ChildListForAccessibility.obtain(this, true);
+ try {
+ final int childCount = children.getChildCount();
+ for (int i = 0; i < childCount; i++) {
+ View child = children.getChildAt(i);
+ if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) {
+ handled = child.dispatchPopulateAccessibilityEvent(event);
+ if (handled) {
+ return handled;
+ }
+ }
+ }
+ } finally {
+ children.recycle();
+ }
+ return false;
+ }
+
+ /**
+ * Dispatch creation of {@link ViewStructure} down the hierarchy. This implementation
+ * adds in all child views of the view group, in addition to calling the default View
+ * implementation.
+ */
+ @Override
+ public void dispatchProvideStructure(ViewStructure structure) {
+ super.dispatchProvideStructure(structure);
+ if (isAssistBlocked() || structure.getChildCount() != 0) {
+ return;
+ }
+ final int childrenCount = mChildrenCount;
+ if (childrenCount <= 0) {
+ return;
+ }
+
+ if (!isLaidOut()) {
+ Log.v(VIEW_LOG_TAG, "dispatchProvideStructure(): not laid out, ignoring "
+ + childrenCount + " children of " + getAccessibilityViewId());
+ return;
+ }
+
+ structure.setChildCount(childrenCount);
+ ArrayList<View> preorderedList = buildOrderedChildList();
+ boolean customOrder = preorderedList == null
+ && isChildrenDrawingOrderEnabled();
+ for (int i = 0; i < childrenCount; i++) {
+ int childIndex;
+ try {
+ childIndex = getAndVerifyPreorderedIndex(childrenCount, i, customOrder);
+ } catch (IndexOutOfBoundsException e) {
+ childIndex = i;
+ if (mContext.getApplicationInfo().targetSdkVersion < Build.VERSION_CODES.M) {
+ Log.w(TAG, "Bad getChildDrawingOrder while collecting assist @ "
+ + i + " of " + childrenCount, e);
+ // At least one app is failing when we call getChildDrawingOrder
+ // at this point, so deal semi-gracefully with it by falling back
+ // on the basic order.
+ customOrder = false;
+ if (i > 0) {
+ // If we failed at the first index, there really isn't
+ // anything to do -- we will just proceed with the simple
+ // sequence order.
+ // Otherwise, we failed in the middle, so need to come up
+ // with an order for the remaining indices and use that.
+ // Failed at the first one, easy peasy.
+ int[] permutation = new int[childrenCount];
+ SparseBooleanArray usedIndices = new SparseBooleanArray();
+ // Go back and collected the indices we have done so far.
+ for (int j = 0; j < i; j++) {
+ permutation[j] = getChildDrawingOrder(childrenCount, j);
+ usedIndices.put(permutation[j], true);
+ }
+ // Fill in the remaining indices with indices that have not
+ // yet been used.
+ int nextIndex = 0;
+ for (int j = i; j < childrenCount; j++) {
+ while (usedIndices.get(nextIndex, false)) {
+ nextIndex++;
+ }
+ permutation[j] = nextIndex;
+ nextIndex++;
+ }
+ // Build the final view list.
+ preorderedList = new ArrayList<>(childrenCount);
+ for (int j = 0; j < childrenCount; j++) {
+ final int index = permutation[j];
+ final View child = mChildren[index];
+ preorderedList.add(child);
+ }
+ }
+ } else {
+ throw e;
+ }
+ }
+ final View child = getAndVerifyPreorderedView(preorderedList, mChildren,
+ childIndex);
+ final ViewStructure cstructure = structure.newChild(i);
+ child.dispatchProvideStructure(cstructure);
+ }
+ if (preorderedList != null) {
+ preorderedList.clear();
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ *
+ * <p>This implementation adds in all child views of the view group, in addition to calling the
+ * default {@link View} implementation.
+ */
+ @Override
+ public void dispatchProvideAutofillStructure(ViewStructure structure,
+ @AutofillFlags int flags) {
+ super.dispatchProvideAutofillStructure(structure, flags);
+ if (structure.getChildCount() != 0) {
+ return;
+ }
+
+ if (!isLaidOut()) {
+ Log.v(VIEW_LOG_TAG, "dispatchProvideAutofillStructure(): not laid out, ignoring "
+ + mChildrenCount + " children of " + getAutofillId());
+ return;
+ }
+
+ final ChildListForAutoFill children = getChildrenForAutofill(flags);
+ final int childrenCount = children.size();
+ structure.setChildCount(childrenCount);
+ for (int i = 0; i < childrenCount; i++) {
+ final View child = children.get(i);
+ final ViewStructure cstructure = structure.newChild(i);
+ child.dispatchProvideAutofillStructure(cstructure, flags);
+ }
+ children.recycle();
+ }
+
+ /**
+ * Gets the children for autofill. Children for autofill are the first
+ * level descendants that are important for autofill. The returned
+ * child list object is pooled and the caller must recycle it once done.
+ * @hide */
+ private @NonNull ChildListForAutoFill getChildrenForAutofill(@AutofillFlags int flags) {
+ final ChildListForAutoFill children = ChildListForAutoFill.obtain();
+ populateChildrenForAutofill(children, flags);
+ return children;
+ }
+
+ /** @hide */
+ private void populateChildrenForAutofill(ArrayList<View> list, @AutofillFlags int flags) {
+ final int childrenCount = mChildrenCount;
+ if (childrenCount <= 0) {
+ return;
+ }
+ final ArrayList<View> preorderedList = buildOrderedChildList();
+ final boolean customOrder = preorderedList == null
+ && isChildrenDrawingOrderEnabled();
+ for (int i = 0; i < childrenCount; i++) {
+ final int childIndex = getAndVerifyPreorderedIndex(childrenCount, i, customOrder);
+ final View child = (preorderedList == null)
+ ? mChildren[childIndex] : preorderedList.get(childIndex);
+ if ((flags & AUTOFILL_FLAG_INCLUDE_NOT_IMPORTANT_VIEWS) != 0
+ || child.isImportantForAutofill()) {
+ list.add(child);
+ } else if (child instanceof ViewGroup) {
+ ((ViewGroup) child).populateChildrenForAutofill(list, flags);
+ }
+ }
+ }
+
+ private static View getAndVerifyPreorderedView(ArrayList<View> preorderedList, View[] children,
+ int childIndex) {
+ final View child;
+ if (preorderedList != null) {
+ child = preorderedList.get(childIndex);
+ if (child == null) {
+ throw new RuntimeException("Invalid preorderedList contained null child at index "
+ + childIndex);
+ }
+ } else {
+ child = children[childIndex];
+ }
+ return child;
+ }
+
+ /** @hide */
+ @Override
+ public void onInitializeAccessibilityNodeInfoInternal(AccessibilityNodeInfo info) {
+ super.onInitializeAccessibilityNodeInfoInternal(info);
+ if (getAccessibilityNodeProvider() != null) {
+ return;
+ }
+ if (mAttachInfo != null) {
+ final ArrayList<View> childrenForAccessibility = mAttachInfo.mTempArrayList;
+ childrenForAccessibility.clear();
+ addChildrenForAccessibility(childrenForAccessibility);
+ final int childrenForAccessibilityCount = childrenForAccessibility.size();
+ for (int i = 0; i < childrenForAccessibilityCount; i++) {
+ final View child = childrenForAccessibility.get(i);
+ info.addChildUnchecked(child);
+ }
+ childrenForAccessibility.clear();
+ }
+ }
+
+ @Override
+ public CharSequence getAccessibilityClassName() {
+ return ViewGroup.class.getName();
+ }
+
+ @Override
+ public void notifySubtreeAccessibilityStateChanged(View child, View source, int changeType) {
+ // If this is a live region, we should send a subtree change event
+ // from this view. Otherwise, we can let it propagate up.
+ if (getAccessibilityLiveRegion() != ACCESSIBILITY_LIVE_REGION_NONE) {
+ notifyViewAccessibilityStateChangedIfNeeded(
+ AccessibilityEvent.CONTENT_CHANGE_TYPE_SUBTREE);
+ } else if (mParent != null) {
+ try {
+ mParent.notifySubtreeAccessibilityStateChanged(this, source, changeType);
+ } catch (AbstractMethodError e) {
+ Log.e(VIEW_LOG_TAG, mParent.getClass().getSimpleName() +
+ " does not fully implement ViewParent", e);
+ }
+ }
+ }
+
+ /** @hide */
+ @Override
+ public void notifySubtreeAccessibilityStateChangedIfNeeded() {
+ if (!AccessibilityManager.getInstance(mContext).isEnabled() || mAttachInfo == null) {
+ return;
+ }
+ // If something important for a11y is happening in this subtree, make sure it's dispatched
+ // from a view that is important for a11y so it doesn't get lost.
+ if ((getImportantForAccessibility() != IMPORTANT_FOR_ACCESSIBILITY_NO_HIDE_DESCENDANTS)
+ && !isImportantForAccessibility() && (getChildCount() > 0)) {
+ ViewParent a11yParent = getParentForAccessibility();
+ if (a11yParent instanceof View) {
+ ((View) a11yParent).notifySubtreeAccessibilityStateChangedIfNeeded();
+ return;
+ }
+ }
+ super.notifySubtreeAccessibilityStateChangedIfNeeded();
+ }
+
+ @Override
+ void resetSubtreeAccessibilityStateChanged() {
+ super.resetSubtreeAccessibilityStateChanged();
+ View[] children = mChildren;
+ final int childCount = mChildrenCount;
+ for (int i = 0; i < childCount; i++) {
+ children[i].resetSubtreeAccessibilityStateChanged();
+ }
+ }
+
+ /**
+ * Counts the number of children of this View that will be sent to an accessibility service.
+ *
+ * @return The number of children an {@code AccessibilityNodeInfo} rooted at this View
+ * would have.
+ */
+ int getNumChildrenForAccessibility() {
+ int numChildrenForAccessibility = 0;
+ for (int i = 0; i < getChildCount(); i++) {
+ View child = getChildAt(i);
+ if (child.includeForAccessibility()) {
+ numChildrenForAccessibility++;
+ } else if (child instanceof ViewGroup) {
+ numChildrenForAccessibility += ((ViewGroup) child)
+ .getNumChildrenForAccessibility();
+ }
+ }
+ return numChildrenForAccessibility;
+ }
+
+ /**
+ * {@inheritDoc}
+ *
+ * <p>Subclasses should always call <code>super.onNestedPrePerformAccessibilityAction</code></p>
+ *
+ * @param target The target view dispatching this action
+ * @param action Action being performed; see
+ * {@link android.view.accessibility.AccessibilityNodeInfo}
+ * @param args Optional action arguments
+ * @return false by default. Subclasses should return true if they handle the event.
+ */
+ @Override
+ public boolean onNestedPrePerformAccessibilityAction(View target, int action, Bundle args) {
+ return false;
+ }
+
+ @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);
+
+ // Similarly, set ACTION_EXIT to all hover targets and clear them.
+ exitHoverTargets();
+ exitTooltipHoverTargets();
+
+ // In case view is detached while transition is running
+ mLayoutCalledWhileSuppressed = false;
+
+ // Tear down our drag tracking
+ mChildrenInterestedInDrag = null;
+ mIsInterestedInDrag = false;
+ if (mCurrentDragStartEvent != null) {
+ mCurrentDragStartEvent.recycle();
+ mCurrentDragStartEvent = null;
+ }
+
+ final int count = mChildrenCount;
+ final View[] children = mChildren;
+ for (int i = 0; i < count; i++) {
+ children[i].dispatchDetachedFromWindow();
+ }
+ clearDisappearingChildren();
+ final int transientCount = mTransientViews == null ? 0 : mTransientIndices.size();
+ for (int i = 0; i < transientCount; ++i) {
+ View view = mTransientViews.get(i);
+ view.dispatchDetachedFromWindow();
+ }
+ super.dispatchDetachedFromWindow();
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ protected void internalSetPadding(int left, int top, int right, int bottom) {
+ super.internalSetPadding(left, top, right, bottom);
+
+ if ((mPaddingLeft | mPaddingTop | mPaddingRight | mPaddingBottom) != 0) {
+ mGroupFlags |= FLAG_PADDING_NOT_NULL;
+ } else {
+ mGroupFlags &= ~FLAG_PADDING_NOT_NULL;
+ }
+ }
+
+ @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);
+ }
+
+ @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);
+ }
+ }
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public 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.mViewFlags = (child.mViewFlags & ~View.VISIBILITY_MASK)
+ | (View.INVISIBLE & View.VISIBILITY_MASK);
+ }
+ }
+ }
+
+ Bitmap b = super.createSnapshot(quality, backgroundColor, skipChildren);
+
+ if (skipChildren) {
+ for (int i = 0; i < count; i++) {
+ View child = getChildAt(i);
+ child.mViewFlags = (child.mViewFlags & ~View.VISIBILITY_MASK)
+ | (visibilities[i] & View.VISIBILITY_MASK);
+ }
+ }
+
+ return b;
+ }
+
+ /** Return true if this ViewGroup is laying out using optical bounds. */
+ boolean isLayoutModeOptical() {
+ return mLayoutMode == LAYOUT_MODE_OPTICAL_BOUNDS;
+ }
+
+ @Override
+ Insets computeOpticalInsets() {
+ if (isLayoutModeOptical()) {
+ int left = 0;
+ int top = 0;
+ int right = 0;
+ int bottom = 0;
+ for (int i = 0; i < mChildrenCount; i++) {
+ View child = getChildAt(i);
+ if (child.getVisibility() == VISIBLE) {
+ Insets insets = child.getOpticalInsets();
+ left = Math.max(left, insets.left);
+ top = Math.max(top, insets.top);
+ right = Math.max(right, insets.right);
+ bottom = Math.max(bottom, insets.bottom);
+ }
+ }
+ return Insets.of(left, top, right, bottom);
+ } else {
+ return Insets.NONE;
+ }
+ }
+
+ private static void fillRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) {
+ if (x1 != x2 && y1 != y2) {
+ if (x1 > x2) {
+ int tmp = x1; x1 = x2; x2 = tmp;
+ }
+ if (y1 > y2) {
+ int tmp = y1; y1 = y2; y2 = tmp;
+ }
+ canvas.drawRect(x1, y1, x2, y2, paint);
+ }
+ }
+
+ private static int sign(int x) {
+ return (x >= 0) ? 1 : -1;
+ }
+
+ private static void drawCorner(Canvas c, Paint paint, int x1, int y1, int dx, int dy, int lw) {
+ fillRect(c, paint, x1, y1, x1 + dx, y1 + lw * sign(dy));
+ fillRect(c, paint, x1, y1, x1 + lw * sign(dx), y1 + dy);
+ }
+
+ private static void drawRectCorners(Canvas canvas, int x1, int y1, int x2, int y2, Paint paint,
+ int lineLength, int lineWidth) {
+ drawCorner(canvas, paint, x1, y1, lineLength, lineLength, lineWidth);
+ drawCorner(canvas, paint, x1, y2, lineLength, -lineLength, lineWidth);
+ drawCorner(canvas, paint, x2, y1, -lineLength, lineLength, lineWidth);
+ drawCorner(canvas, paint, x2, y2, -lineLength, -lineLength, lineWidth);
+ }
+
+ private static void fillDifference(Canvas canvas,
+ int x2, int y2, int x3, int y3,
+ int dx1, int dy1, int dx2, int dy2, Paint paint) {
+ int x1 = x2 - dx1;
+ int y1 = y2 - dy1;
+
+ int x4 = x3 + dx2;
+ int y4 = y3 + dy2;
+
+ fillRect(canvas, paint, x1, y1, x4, y2);
+ fillRect(canvas, paint, x1, y2, x2, y3);
+ fillRect(canvas, paint, x3, y2, x4, y3);
+ fillRect(canvas, paint, x1, y3, x4, y4);
+ }
+
+ /**
+ * Layout debugging code which draws rectangles around layout params.
+ *
+ * <p>This function is called automatically when the developer setting is enabled.<p/>
+ *
+ * <p>It is strongly advised to only call this function from debug builds as there is
+ * a risk of leaking unwanted layout information.<p/>
+ *
+ * @param canvas the canvas on which to draw
+ * @param paint the paint used to draw through
+ */
+ protected void onDebugDrawMargins(Canvas canvas, Paint paint) {
+ for (int i = 0; i < getChildCount(); i++) {
+ View c = getChildAt(i);
+ c.getLayoutParams().onDebugDraw(c, canvas, paint);
+ }
+ }
+
+ /**
+ * Layout debugging code which draws rectangles around:
+ * <ul>
+ * <li>optical bounds<li/>
+ * <li>margins<li/>
+ * <li>clip bounds<li/>
+ * <ul/>
+ *
+ * <p>This function is called automatically when the developer setting is enabled.<p/>
+ *
+ * <p>It is strongly advised to only call this function from debug builds as there is
+ * a risk of leaking unwanted layout information.<p/>
+ *
+ * @param canvas the canvas on which to draw
+ */
+ protected void onDebugDraw(Canvas canvas) {
+ Paint paint = getDebugPaint();
+
+ // Draw optical bounds
+ {
+ paint.setColor(Color.RED);
+ paint.setStyle(Paint.Style.STROKE);
+
+ for (int i = 0; i < getChildCount(); i++) {
+ View c = getChildAt(i);
+ if (c.getVisibility() != View.GONE) {
+ Insets insets = c.getOpticalInsets();
+
+ drawRect(canvas, paint,
+ c.getLeft() + insets.left,
+ c.getTop() + insets.top,
+ c.getRight() - insets.right - 1,
+ c.getBottom() - insets.bottom - 1);
+ }
+ }
+ }
+
+ // Draw margins
+ {
+ paint.setColor(Color.argb(63, 255, 0, 255));
+ paint.setStyle(Paint.Style.FILL);
+
+ onDebugDrawMargins(canvas, paint);
+ }
+
+ // Draw clip bounds
+ {
+ paint.setColor(DEBUG_CORNERS_COLOR);
+ paint.setStyle(Paint.Style.FILL);
+
+ int lineLength = dipsToPixels(DEBUG_CORNERS_SIZE_DIP);
+ int lineWidth = dipsToPixels(1);
+ for (int i = 0; i < getChildCount(); i++) {
+ View c = getChildAt(i);
+ if (c.getVisibility() != View.GONE) {
+ drawRectCorners(canvas, c.getLeft(), c.getTop(), c.getRight(), c.getBottom(),
+ paint, lineLength, lineWidth);
+ }
+ }
+ }
+ }
+
+ @Override
+ protected void dispatchDraw(Canvas canvas) {
+ boolean usingRenderNodeProperties = canvas.isRecordingFor(mRenderNode);
+ final int childrenCount = mChildrenCount;
+ final View[] children = mChildren;
+ int flags = mGroupFlags;
+
+ if ((flags & FLAG_RUN_ANIMATION) != 0 && canAnimate()) {
+ final boolean buildCache = !isHardwareAccelerated();
+ for (int i = 0; i < childrenCount; i++) {
+ final View child = children[i];
+ if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE) {
+ final LayoutParams params = child.getLayoutParams();
+ attachLayoutAnimationParameters(child, params, i, childrenCount);
+ bindLayoutAnimation(child);
+ }
+ }
+
+ final LayoutAnimationController controller = mLayoutAnimationController;
+ if (controller.willOverlap()) {
+ mGroupFlags |= FLAG_OPTIMIZE_INVALIDATE;
+ }
+
+ controller.start();
+
+ mGroupFlags &= ~FLAG_RUN_ANIMATION;
+ mGroupFlags &= ~FLAG_ANIMATION_DONE;
+
+ if (mAnimationListener != null) {
+ mAnimationListener.onAnimationStart(controller.getAnimation());
+ }
+ }
+
+ int clipSaveCount = 0;
+ final boolean clipToPadding = (flags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK;
+ if (clipToPadding) {
+ clipSaveCount = canvas.save(Canvas.CLIP_SAVE_FLAG);
+ 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 &= ~PFLAG_DRAW_ANIMATION;
+ mGroupFlags &= ~FLAG_INVALIDATE_REQUIRED;
+
+ boolean more = false;
+ final long drawingTime = getDrawingTime();
+
+ if (usingRenderNodeProperties) canvas.insertReorderBarrier();
+ final int transientCount = mTransientIndices == null ? 0 : mTransientIndices.size();
+ int transientIndex = transientCount != 0 ? 0 : -1;
+ // Only use the preordered list if not HW accelerated, since the HW pipeline will do the
+ // draw reordering internally
+ final ArrayList<View> preorderedList = usingRenderNodeProperties
+ ? null : buildOrderedChildList();
+ final boolean customOrder = preorderedList == null
+ && isChildrenDrawingOrderEnabled();
+ for (int i = 0; i < childrenCount; i++) {
+ while (transientIndex >= 0 && mTransientIndices.get(transientIndex) == i) {
+ final View transientChild = mTransientViews.get(transientIndex);
+ if ((transientChild.mViewFlags & VISIBILITY_MASK) == VISIBLE ||
+ transientChild.getAnimation() != null) {
+ more |= drawChild(canvas, transientChild, drawingTime);
+ }
+ transientIndex++;
+ if (transientIndex >= transientCount) {
+ transientIndex = -1;
+ }
+ }
+
+ final int childIndex = getAndVerifyPreorderedIndex(childrenCount, i, customOrder);
+ final View child = getAndVerifyPreorderedView(preorderedList, children, childIndex);
+ if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) {
+ more |= drawChild(canvas, child, drawingTime);
+ }
+ }
+ while (transientIndex >= 0) {
+ // there may be additional transient views after the normal views
+ final View transientChild = mTransientViews.get(transientIndex);
+ if ((transientChild.mViewFlags & VISIBILITY_MASK) == VISIBLE ||
+ transientChild.getAnimation() != null) {
+ more |= drawChild(canvas, transientChild, drawingTime);
+ }
+ transientIndex++;
+ if (transientIndex >= transientCount) {
+ break;
+ }
+ }
+ if (preorderedList != null) preorderedList.clear();
+
+ // 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 (usingRenderNodeProperties) canvas.insertInorderBarrier();
+
+ if (debugDraw()) {
+ onDebugDraw(canvas);
+ }
+
+ if (clipToPadding) {
+ canvas.restoreToCount(clipSaveCount);
+ }
+
+ // 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() {
+ @Override
+ public void run() {
+ notifyAnimationListener();
+ }
+ };
+ post(end);
+ }
+ }
+
+ /**
+ * Returns the ViewGroupOverlay for this view group, creating it if it does
+ * not yet exist. In addition to {@link ViewOverlay}'s support for drawables,
+ * {@link ViewGroupOverlay} allows views to be added to the overlay. These
+ * views, like overlay drawables, are visual-only; they do not receive input
+ * events and should not be used as anything other than a temporary
+ * representation of a view in a parent container, such as might be used
+ * by an animation effect.
+ *
+ * <p>Note: Overlays do not currently work correctly with {@link
+ * SurfaceView} or {@link TextureView}; contents in overlays for these
+ * types of views may not display correctly.</p>
+ *
+ * @return The ViewGroupOverlay object for this view.
+ * @see ViewGroupOverlay
+ */
+ @Override
+ public ViewGroupOverlay getOverlay() {
+ if (mOverlay == null) {
+ mOverlay = new ViewGroupOverlay(mContext, this);
+ }
+ return (ViewGroupOverlay) mOverlay;
+ }
+
+ /**
+ * 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 boolean hasChildWithZ() {
+ for (int i = 0; i < mChildrenCount; i++) {
+ if (mChildren[i].getZ() != 0) return true;
+ }
+ return false;
+ }
+
+ /**
+ * Populates (and returns) mPreSortedChildren with a pre-ordered list of the View's children,
+ * sorted first by Z, then by child drawing order (if applicable). This list must be cleared
+ * after use to avoid leaking child Views.
+ *
+ * Uses a stable, insertion sort which is commonly O(n) for ViewGroups with very few elevated
+ * children.
+ */
+ ArrayList<View> buildOrderedChildList() {
+ final int childrenCount = mChildrenCount;
+ if (childrenCount <= 1 || !hasChildWithZ()) return null;
+
+ if (mPreSortedChildren == null) {
+ mPreSortedChildren = new ArrayList<>(childrenCount);
+ } else {
+ // callers should clear, so clear shouldn't be necessary, but for safety...
+ mPreSortedChildren.clear();
+ mPreSortedChildren.ensureCapacity(childrenCount);
+ }
+
+ final boolean customOrder = isChildrenDrawingOrderEnabled();
+ for (int i = 0; i < childrenCount; i++) {
+ // add next child (in child order) to end of list
+ final int childIndex = getAndVerifyPreorderedIndex(childrenCount, i, customOrder);
+ final View nextChild = mChildren[childIndex];
+ final float currentZ = nextChild.getZ();
+
+ // insert ahead of any Views with greater Z
+ int insertIndex = i;
+ while (insertIndex > 0 && mPreSortedChildren.get(insertIndex - 1).getZ() > currentZ) {
+ insertIndex--;
+ }
+ mPreSortedChildren.add(insertIndex, nextChild);
+ }
+ return mPreSortedChildren;
+ }
+
+ private void notifyAnimationListener() {
+ mGroupFlags &= ~FLAG_NOTIFY_ANIMATION_LISTENER;
+ mGroupFlags |= FLAG_ANIMATION_DONE;
+
+ if (mAnimationListener != null) {
+ final Runnable end = new Runnable() {
+ @Override
+ public void run() {
+ mAnimationListener.onAnimationEnd(mLayoutAnimationController.getAnimation());
+ }
+ };
+ post(end);
+ }
+
+ 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)) {
+ recreateChildDisplayList(child);
+ }
+ }
+ if (mOverlay != null) {
+ View overlayView = mOverlay.getOverlayView();
+ recreateChildDisplayList(overlayView);
+ }
+ if (mDisappearingChildren != null) {
+ final ArrayList<View> disappearingChildren = mDisappearingChildren;
+ final int disappearingCount = disappearingChildren.size();
+ for (int i = 0; i < disappearingCount; ++i) {
+ final View child = disappearingChildren.get(i);
+ recreateChildDisplayList(child);
+ }
+ }
+ }
+
+ private void recreateChildDisplayList(View child) {
+ child.mRecreateDisplayList = (child.mPrivateFlags & PFLAG_INVALIDATED) != 0;
+ child.mPrivateFlags &= ~PFLAG_INVALIDATED;
+ child.updateDisplayListIfDirty();
+ 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);
+ }
+
+ @Override
+ void getScrollIndicatorBounds(@NonNull Rect out) {
+ super.getScrollIndicatorBounds(out);
+
+ // If we have padding and we're supposed to clip children to that
+ // padding, offset the scroll indicators to match our clip bounds.
+ final boolean clipToPadding = (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK;
+ if (clipToPadding) {
+ out.left += mPaddingLeft;
+ out.right -= mPaddingRight;
+ out.top += mPaddingTop;
+ out.bottom -= mPaddingBottom;
+ }
+ }
+
+ /**
+ * Returns whether this group's children are clipped to their bounds before drawing.
+ * The default value is true.
+ * @see #setClipChildren(boolean)
+ *
+ * @return True if the group's children will be clipped to their bounds,
+ * false otherwise.
+ */
+ @ViewDebug.ExportedProperty(category = "drawing")
+ public boolean getClipChildren() {
+ return ((mGroupFlags & FLAG_CLIP_CHILDREN) != 0);
+ }
+
+ /**
+ * 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);
+ for (int i = 0; i < mChildrenCount; ++i) {
+ View child = getChildAt(i);
+ if (child.mRenderNode != null) {
+ child.mRenderNode.setClipToBounds(clipChildren);
+ }
+ }
+ invalidate(true);
+ }
+ }
+
+ /**
+ * Sets whether this ViewGroup will clip its children to its padding and resize (but not
+ * clip) any EdgeEffect to the padded region, if padding is present.
+ * <p>
+ * By default, children are clipped to the padding of their parent
+ * ViewGroup. This clipping behavior is only enabled if padding is non-zero.
+ *
+ * @param clipToPadding true to clip children to the padding of the group, and resize (but
+ * not clip) any EdgeEffect to the padded region. False otherwise.
+ * @attr ref android.R.styleable#ViewGroup_clipToPadding
+ */
+ public void setClipToPadding(boolean clipToPadding) {
+ if (hasBooleanFlag(FLAG_CLIP_TO_PADDING) != clipToPadding) {
+ setBooleanFlag(FLAG_CLIP_TO_PADDING, clipToPadding);
+ invalidate(true);
+ }
+ }
+
+ /**
+ * Returns whether this ViewGroup will clip its children to its padding, and resize (but
+ * not clip) any EdgeEffect to the padded region, if padding is present.
+ * <p>
+ * By default, children are clipped to the padding of their parent
+ * Viewgroup. This clipping behavior is only enabled if padding is non-zero.
+ *
+ * @return true if this ViewGroup clips children to its padding and resizes (but doesn't
+ * clip) any EdgeEffect to the padded region, false otherwise.
+ *
+ * @attr ref android.R.styleable#ViewGroup_clipToPadding
+ */
+ @ViewDebug.ExportedProperty(category = "drawing")
+ public boolean getClipToPadding() {
+ return hasBooleanFlag(FLAG_CLIP_TO_PADDING);
+ }
+
+ @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);
+ }
+ }
+
+ @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);
+ }
+ }
+ }
+
+ /**
+ * Dispatches drawable hotspot changes to child views that meet at least
+ * one of the following criteria:
+ * <ul>
+ * <li>Returns {@code false} from both {@link View#isClickable()} and
+ * {@link View#isLongClickable()}</li>
+ * <li>Requests duplication of parent state via
+ * {@link View#setDuplicateParentStateEnabled(boolean)}</li>
+ * </ul>
+ *
+ * @param x hotspot x coordinate
+ * @param y hotspot y coordinate
+ * @see #drawableHotspotChanged(float, float)
+ */
+ @Override
+ public void dispatchDrawableHotspotChanged(float x, float y) {
+ final int count = mChildrenCount;
+ if (count == 0) {
+ return;
+ }
+
+ final View[] children = mChildren;
+ for (int i = 0; i < count; i++) {
+ final View child = children[i];
+ // Children that are clickable on their own should not
+ // receive hotspots when their parent view does.
+ final boolean nonActionable = !child.isClickable() && !child.isLongClickable();
+ final boolean duplicatesState = (child.mViewFlags & DUPLICATE_PARENT_STATE) != 0;
+ if (nonActionable || duplicatesState) {
+ final float[] point = getTempPoint();
+ point[0] = x;
+ point[1] = y;
+ transformPointToViewLocal(point, child);
+ child.drawableHotspotChanged(point[0], point[1]);
+ }
+ }
+ }
+
+ @Override
+ void dispatchCancelPendingInputEvents() {
+ super.dispatchCancelPendingInputEvents();
+
+ final View[] children = mChildren;
+ final int count = mChildrenCount;
+ for (int i = 0; i < count; i++) {
+ children[i].dispatchCancelPendingInputEvents();
+ }
+ }
+
+ /**
+ * 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 #getChildStaticTransformation(View, android.view.animation.Transformation)
+ */
+ 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. {@link #setStaticTransformationsEnabled(boolean)} must be set to true
+ * for this method to be called.
+ *
+ * @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;
+ }
+
+ Transformation getChildTransformation() {
+ if (mChildTransformation == null) {
+ mChildTransformation = new Transformation();
+ }
+ return mChildTransformation;
+ }
+
+ /**
+ * {@hide}
+ */
+ @Override
+ protected <T extends View> T findViewTraversal(@IdRes int id) {
+ if (id == mID) {
+ return (T) this;
+ }
+
+ final View[] where = mChildren;
+ final int len = mChildrenCount;
+
+ for (int i = 0; i < len; i++) {
+ View v = where[i];
+
+ if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) {
+ v = v.findViewById(id);
+
+ if (v != null) {
+ return (T) v;
+ }
+ }
+ }
+
+ return null;
+ }
+
+ /**
+ * {@hide}
+ */
+ @Override
+ protected <T extends View> T findViewWithTagTraversal(Object tag) {
+ if (tag != null && tag.equals(mTag)) {
+ return (T) this;
+ }
+
+ final View[] where = mChildren;
+ final int len = mChildrenCount;
+
+ for (int i = 0; i < len; i++) {
+ View v = where[i];
+
+ if ((v.mPrivateFlags & PFLAG_IS_ROOT_NAMESPACE) == 0) {
+ v = v.findViewWithTag(tag);
+
+ if (v != null) {
+ return (T) v;
+ }
+ }
+ }
+
+ return null;
+ }
+
+ /**
+ * {@hide}
+ */
+ @Override
+ protected <T extends View> T findViewByPredicateTraversal(Predicate<View> predicate,
+ View childToSkip) {
+ if (predicate.test(this)) {
+ return (T) 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 & PFLAG_IS_ROOT_NAMESPACE) == 0) {
+ v = v.findViewByPredicate(predicate);
+
+ if (v != null) {
+ return (T) v;
+ }
+ }
+ }
+
+ return null;
+ }
+
+ /**
+ * This method adds a view to this container at the specified index purely for the
+ * purposes of allowing that view to draw even though it is not a normal child of
+ * the container. That is, the view does not participate in layout, focus, accessibility,
+ * input, or other normal view operations; it is purely an item to be drawn during the normal
+ * rendering operation of this container. The index that it is added at is the order
+ * in which it will be drawn, with respect to the other views in the container.
+ * For example, a transient view added at index 0 will be drawn before all other views
+ * in the container because it will be drawn first (including before any real view
+ * at index 0). There can be more than one transient view at any particular index;
+ * these views will be drawn in the order in which they were added to the list of
+ * transient views. The index of transient views can also be greater than the number
+ * of normal views in the container; that just means that they will be drawn after all
+ * other views are drawn.
+ *
+ * <p>Note that since transient views do not participate in layout, they must be sized
+ * manually or, more typically, they should just use the size that they had before they
+ * were removed from their container.</p>
+ *
+ * <p>Transient views are useful for handling animations of views that have been removed
+ * from the container, but which should be animated out after the removal. Adding these
+ * views as transient views allows them to participate in drawing without side-effecting
+ * the layout of the container.</p>
+ *
+ * <p>Transient views must always be explicitly {@link #removeTransientView(View) removed}
+ * from the container when they are no longer needed. For example, a transient view
+ * which is added in order to fade it out in its old location should be removed
+ * once the animation is complete.</p>
+ *
+ * @param view The view to be added
+ * @param index The index at which this view should be drawn, must be >= 0.
+ * This value is relative to the {@link #getChildAt(int) index} values in the normal
+ * child list of this container, where any transient view at a particular index will
+ * be drawn before any normal child at that same index.
+ *
+ * @hide
+ */
+ public void addTransientView(View view, int index) {
+ if (index < 0) {
+ return;
+ }
+ if (mTransientIndices == null) {
+ mTransientIndices = new ArrayList<Integer>();
+ mTransientViews = new ArrayList<View>();
+ }
+ final int oldSize = mTransientIndices.size();
+ if (oldSize > 0) {
+ int insertionIndex;
+ for (insertionIndex = 0; insertionIndex < oldSize; ++insertionIndex) {
+ if (index < mTransientIndices.get(insertionIndex)) {
+ break;
+ }
+ }
+ mTransientIndices.add(insertionIndex, index);
+ mTransientViews.add(insertionIndex, view);
+ } else {
+ mTransientIndices.add(index);
+ mTransientViews.add(view);
+ }
+ view.mParent = this;
+ view.dispatchAttachedToWindow(mAttachInfo, (mViewFlags&VISIBILITY_MASK));
+ invalidate(true);
+ }
+
+ /**
+ * Removes a view from the list of transient views in this container. If there is no
+ * such transient view, this method does nothing.
+ *
+ * @param view The transient view to be removed
+ *
+ * @hide
+ */
+ public void removeTransientView(View view) {
+ if (mTransientViews == null) {
+ return;
+ }
+ final int size = mTransientViews.size();
+ for (int i = 0; i < size; ++i) {
+ if (view == mTransientViews.get(i)) {
+ mTransientViews.remove(i);
+ mTransientIndices.remove(i);
+ view.mParent = null;
+ view.dispatchDetachedFromWindow();
+ invalidate(true);
+ return;
+ }
+ }
+ }
+
+ /**
+ * Returns the number of transient views in this container. Specific transient
+ * views and the index at which they were added can be retrieved via
+ * {@link #getTransientView(int)} and {@link #getTransientViewIndex(int)}.
+ *
+ * @see #addTransientView(View, int)
+ * @return The number of transient views in this container
+ *
+ * @hide
+ */
+ public int getTransientViewCount() {
+ return mTransientIndices == null ? 0 : mTransientIndices.size();
+ }
+
+ /**
+ * Given a valid position within the list of transient views, returns the index of
+ * the transient view at that position.
+ *
+ * @param position The position of the index being queried. Must be at least 0
+ * and less than the value returned by {@link #getTransientViewCount()}.
+ * @return The index of the transient view stored in the given position if the
+ * position is valid, otherwise -1
+ *
+ * @hide
+ */
+ public int getTransientViewIndex(int position) {
+ if (position < 0 || mTransientIndices == null || position >= mTransientIndices.size()) {
+ return -1;
+ }
+ return mTransientIndices.get(position);
+ }
+
+ /**
+ * Given a valid position within the list of transient views, returns the
+ * transient view at that position.
+ *
+ * @param position The position of the view being queried. Must be at least 0
+ * and less than the value returned by {@link #getTransientViewCount()}.
+ * @return The transient view stored in the given position if the
+ * position is valid, otherwise null
+ *
+ * @hide
+ */
+ public View getTransientView(int position) {
+ if (mTransientViews == null || position >= mTransientViews.size()) {
+ return null;
+ }
+ return mTransientViews.get(position);
+ }
+
+ /**
+ * <p>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.</p>
+ *
+ * <p><strong>Note:</strong> do not invoke this method from
+ * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
+ * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
+ *
+ * @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.
+ *
+ * <p><strong>Note:</strong> do not invoke this method from
+ * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
+ * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
+ *
+ * @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) {
+ if (child == null) {
+ throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup");
+ }
+ 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.
+ *
+ * <p><strong>Note:</strong> do not invoke this method from
+ * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
+ * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
+ *
+ * @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.
+ *
+ * <p><strong>Note:</strong> do not invoke this method from
+ * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
+ * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
+ *
+ * @param child the child view to add
+ * @param params the layout parameters to set on the child
+ */
+ @Override
+ public void addView(View child, LayoutParams params) {
+ addView(child, -1, params);
+ }
+
+ /**
+ * Adds a child view with the specified layout parameters.
+ *
+ * <p><strong>Note:</strong> do not invoke this method from
+ * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
+ * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
+ *
+ * @param child the child view to add
+ * @param index the position at which to add the child or -1 to add last
+ * @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");
+ }
+
+ if (child == null) {
+ throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup");
+ }
+
+ // 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);
+ }
+
+ @Override
+ 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);
+ }
+
+ 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;
+ }
+
+ void dispatchViewAdded(View child) {
+ onViewAdded(child);
+ if (mOnHierarchyChangeListener != null) {
+ mOnHierarchyChangeListener.onChildViewAdded(this, child);
+ }
+ }
+
+ /**
+ * Called when a new child is added to this ViewGroup. Overrides should always
+ * call super.onViewAdded.
+ *
+ * @param child the added child view
+ */
+ public void onViewAdded(View child) {
+ }
+
+ void dispatchViewRemoved(View child) {
+ onViewRemoved(child);
+ if (mOnHierarchyChangeListener != null) {
+ mOnHierarchyChangeListener.onChildViewRemoved(this, child);
+ }
+ }
+
+ /**
+ * Called when a child view is removed from this ViewGroup. Overrides should always
+ * call super.onViewRemoved.
+ *
+ * @param child the removed child view
+ */
+ public void onViewRemoved(View child) {
+ }
+
+ private void clearCachedLayoutMode() {
+ if (!hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) {
+ mLayoutMode = LAYOUT_MODE_UNDEFINED;
+ }
+ }
+
+ @Override
+ protected void onAttachedToWindow() {
+ super.onAttachedToWindow();
+ clearCachedLayoutMode();
+ }
+
+ @Override
+ protected void onDetachedFromWindow() {
+ super.onDetachedFromWindow();
+ clearCachedLayoutMode();
+ }
+
+ /** @hide */
+ @Override
+ protected void destroyHardwareResources() {
+ super.destroyHardwareResources();
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ getChildAt(i).destroyHardwareResources();
+ }
+ }
+
+ /**
+ * 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 or -1 to add last
+ * @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 or -1 to add last
+ * @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) {
+ if (child == null) {
+ throw new IllegalArgumentException("Cannot add a null child view to a ViewGroup");
+ }
+ child.mParent = null;
+ addViewInner(child, index, params, preventRequestLayout);
+ child.mPrivateFlags = (child.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_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.PFLAG_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;
+ }
+
+ final boolean childHasFocus = child.hasFocus();
+ if (childHasFocus) {
+ 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;
+ }
+
+ if (child.isLayoutDirectionInherited()) {
+ child.resetRtlProperties();
+ }
+
+ dispatchViewAdded(child);
+
+ if ((child.mViewFlags & DUPLICATE_PARENT_STATE) == DUPLICATE_PARENT_STATE) {
+ mGroupFlags |= FLAG_NOTIFY_CHILDREN_ON_DRAWABLE_STATE_CHANGE;
+ }
+
+ if (child.hasTransientState()) {
+ childHasTransientStateChanged(child, true);
+ }
+
+ if (child.getVisibility() != View.GONE) {
+ notifySubtreeAccessibilityStateChangedIfNeeded();
+ }
+
+ if (mTransientIndices != null) {
+ final int transientCount = mTransientIndices.size();
+ for (int i = 0; i < transientCount; ++i) {
+ final int oldIndex = mTransientIndices.get(i);
+ if (index <= oldIndex) {
+ mTransientIndices.set(i, oldIndex + 1);
+ }
+ }
+ }
+
+ if (mCurrentDragStartEvent != null && child.getVisibility() == VISIBLE) {
+ notifyChildOfDragStart(child);
+ }
+
+ if (child.hasDefaultFocus()) {
+ // When adding a child that contains default focus, either during inflation or while
+ // manually assembling the hierarchy, update the ancestor default-focus chain.
+ setDefaultFocus(child);
+ }
+ }
+
+ 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}
+ *
+ * <p><strong>Note:</strong> do not invoke this method from
+ * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
+ * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
+ */
+ @Override
+ public void removeView(View view) {
+ if (removeViewInternal(view)) {
+ requestLayout();
+ invalidate(true);
+ }
+ }
+
+ /**
+ * Removes a view during layout. This is useful if in your onLayout() method,
+ * you need to remove more views.
+ *
+ * <p><strong>Note:</strong> do not invoke this method from
+ * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
+ * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
+ *
+ * @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.
+ *
+ * <p><strong>Note:</strong> do not invoke this method from
+ * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
+ * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
+ *
+ * @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.
+ *
+ * <p><strong>Note:</strong> do not invoke this method from
+ * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
+ * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
+ *
+ * @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.
+ *
+ * <p><strong>Note:</strong> do not invoke this method from
+ * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
+ * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
+ *
+ * @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 boolean removeViewInternal(View view) {
+ final int index = indexOfChild(view);
+ if (index >= 0) {
+ removeViewInternal(index, view);
+ return true;
+ }
+ return false;
+ }
+
+ private void removeViewInternal(int index, View view) {
+ if (mTransition != null) {
+ mTransition.removeChild(this, view);
+ }
+
+ boolean clearChildFocus = false;
+ if (view == mFocused) {
+ view.unFocus(null);
+ clearChildFocus = true;
+ }
+ if (view == mFocusedInCluster) {
+ clearFocusedInCluster(view);
+ }
+
+ view.clearAccessibilityFocus();
+
+ cancelTouchTarget(view);
+ cancelHoverTarget(view);
+
+ if (view.getAnimation() != null ||
+ (mTransitioningViews != null && mTransitioningViews.contains(view))) {
+ addDisappearingView(view);
+ } else if (view.mAttachInfo != null) {
+ view.dispatchDetachedFromWindow();
+ }
+
+ if (view.hasTransientState()) {
+ childHasTransientStateChanged(view, false);
+ }
+
+ needGlobalAttributesUpdate(false);
+
+ removeFromArray(index);
+
+ if (view == mDefaultFocus) {
+ clearDefaultFocus(view);
+ }
+ if (clearChildFocus) {
+ clearChildFocus(view);
+ if (!rootViewRequestFocus()) {
+ notifyGlobalFocusCleared(this);
+ }
+ }
+
+ dispatchViewRemoved(view);
+
+ if (view.getVisibility() != View.GONE) {
+ notifySubtreeAccessibilityStateChangedIfNeeded();
+ }
+
+ int transientCount = mTransientIndices == null ? 0 : mTransientIndices.size();
+ for (int i = 0; i < transientCount; ++i) {
+ final int oldIndex = mTransientIndices.get(i);
+ if (index < oldIndex) {
+ mTransientIndices.set(i, oldIndex - 1);
+ }
+ }
+
+ if (mCurrentDragStartEvent != null) {
+ mChildrenInterestedInDrag.remove(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).
+ *
+ * <p>Replacing a non-null transition will cause that previous transition to be
+ * canceled, if it is currently running, to restore this container to
+ * its correct post-transition state.</p>
+ *
+ * @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) {
+ LayoutTransition previousTransition = mTransition;
+ previousTransition.cancel();
+ previousTransition.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 int end = start + count;
+
+ if (start < 0 || count < 0 || end > mChildrenCount) {
+ throw new IndexOutOfBoundsException();
+ }
+
+ final View focused = mFocused;
+ final boolean detach = mAttachInfo != null;
+ boolean clearChildFocus = false;
+ View clearDefaultFocus = null;
+
+ final View[] children = mChildren;
+
+ for (int i = start; i < end; i++) {
+ final View view = children[i];
+
+ if (mTransition != null) {
+ mTransition.removeChild(this, view);
+ }
+
+ if (view == focused) {
+ view.unFocus(null);
+ clearChildFocus = true;
+ }
+ if (view == mDefaultFocus) {
+ clearDefaultFocus = view;
+ }
+ if (view == mFocusedInCluster) {
+ clearFocusedInCluster(view);
+ }
+
+ view.clearAccessibilityFocus();
+
+ cancelTouchTarget(view);
+ cancelHoverTarget(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);
+
+ dispatchViewRemoved(view);
+ }
+
+ removeFromArray(start, count);
+
+ if (clearDefaultFocus != null) {
+ clearDefaultFocus(clearDefaultFocus);
+ }
+ if (clearChildFocus) {
+ clearChildFocus(focused);
+ if (!rootViewRequestFocus()) {
+ notifyGlobalFocusCleared(focused);
+ }
+ }
+ }
+
+ /**
+ * Call this method to remove all child views from the
+ * ViewGroup.
+ *
+ * <p><strong>Note:</strong> do not invoke this method from
+ * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
+ * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
+ */
+ 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.
+ *
+ * <p><strong>Note:</strong> do not invoke this method from
+ * {@link #draw(android.graphics.Canvas)}, {@link #onDraw(android.graphics.Canvas)},
+ * {@link #dispatchDraw(android.graphics.Canvas)} or any related method.</p>
+ */
+ 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;
+ boolean clearChildFocus = false;
+
+ 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.unFocus(null);
+ clearChildFocus = true;
+ }
+
+ view.clearAccessibilityFocus();
+
+ cancelTouchTarget(view);
+ cancelHoverTarget(view);
+
+ if (view.getAnimation() != null ||
+ (mTransitioningViews != null && mTransitioningViews.contains(view))) {
+ addDisappearingView(view);
+ } else if (detach) {
+ view.dispatchDetachedFromWindow();
+ }
+
+ if (view.hasTransientState()) {
+ childHasTransientStateChanged(view, false);
+ }
+
+ dispatchViewRemoved(view);
+
+ view.mParent = null;
+ children[i] = null;
+ }
+
+ if (mDefaultFocus != null) {
+ clearDefaultFocus(mDefaultFocus);
+ }
+ if (mFocusedInCluster != null) {
+ clearFocusedInCluster(mFocusedInCluster);
+ }
+ if (clearChildFocus) {
+ clearChildFocus(focused);
+ if (!rootViewRequestFocus()) {
+ notifyGlobalFocusCleared(focused);
+ }
+ }
+ }
+
+ /**
+ * Finishes the removal of a detached view. This method will dispatch the detached from
+ * window event and notify the hierarchy change listener.
+ * <p>
+ * This method is intended to be lightweight and makes no assumptions about whether the
+ * parent or child should be redrawn. Proper use of this method will include also making
+ * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls.
+ * For example, callers can {@link #post(Runnable) post} a {@link Runnable}
+ * which performs a {@link #requestLayout()} on the next frame, after all detach/remove
+ * calls are finished, causing layout to be run prior to redrawing the view hierarchy.
+ *
+ * @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 (child == mDefaultFocus) {
+ clearDefaultFocus(child);
+ }
+ if (child == mFocusedInCluster) {
+ clearFocusedInCluster(child);
+ }
+
+ child.clearAccessibilityFocus();
+
+ cancelTouchTarget(child);
+ cancelHoverTarget(child);
+
+ 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);
+ }
+
+ dispatchViewRemoved(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 that
+ * it can be retrieved by calling {@link #getChildAt(int)}.
+ * <p>
+ * This method is intended to be lightweight and makes no assumptions about whether the
+ * parent or child should be redrawn. Proper use of this method will include also making
+ * any appropriate {@link #requestLayout()} or {@link #invalidate()} calls.
+ * For example, callers can {@link #post(Runnable) post} a {@link Runnable}
+ * which performs a {@link #requestLayout()} on the next frame, after all detach/attach
+ * calls are finished, causing layout to be run prior to redrawing the view hierarchy.
+ * <p>
+ * This method should be called only for views 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 & ~PFLAG_DIRTY_MASK
+ & ~PFLAG_DRAWING_CACHE_VALID)
+ | PFLAG_DRAWN | PFLAG_INVALIDATED;
+ this.mPrivateFlags |= PFLAG_INVALIDATED;
+
+ if (child.hasFocus()) {
+ requestChildFocus(child, child.findFocus());
+ }
+ dispatchVisibilityAggregated(isAttachedToWindow() && getWindowVisibility() == VISIBLE
+ && isShown());
+ }
+
+ /**
+ * Detaches a view from its parent. Detaching a view should be followed
+ * either by a call to
+ * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)}
+ * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be
+ * temporary; reattachment or removal should happen within the same drawing cycle as
+ * detachment. 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 followed
+ * either by a call to
+ * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)}
+ * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be
+ * temporary; reattachment or removal should happen within the same drawing cycle as
+ * detachment. 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 views from their parents. Detaching a view should be followed
+ * either by a call to
+ * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)}
+ * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be
+ * temporary; reattachment or removal should happen within the same drawing cycle as
+ * detachment. 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 followed
+ * either by a call to
+ * {@link #attachViewToParent(View, int, android.view.ViewGroup.LayoutParams)}
+ * or a call to {@link #removeDetachedView(View, boolean)}. Detachment should only be
+ * temporary; reattachment or removal should happen within the same drawing cycle as
+ * detachment. 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;
+ }
+ }
+
+ @Override
+ @CallSuper
+ public void onDescendantInvalidated(@NonNull View child, @NonNull View target) {
+ /*
+ * HW-only, Rect-ignoring damage codepath
+ *
+ * We don't deal with rectangles here, since RenderThread native code computes damage for
+ * everything drawn by HWUI (and SW layer / drawing cache doesn't keep track of damage area)
+ */
+
+ // if set, combine the animation flag into the parent
+ mPrivateFlags |= (target.mPrivateFlags & PFLAG_DRAW_ANIMATION);
+
+ if ((target.mPrivateFlags & ~PFLAG_DIRTY_MASK) != 0) {
+ // We lazily use PFLAG_DIRTY, since computing opaque isn't worth the potential
+ // optimization in provides in a DisplayList world.
+ mPrivateFlags = (mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DIRTY;
+
+ // simplified invalidateChildInParent behavior: clear cache validity to be safe...
+ mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
+ }
+
+ // ... and mark inval if in software layer that needs to repaint (hw handled in native)
+ if (mLayerType == LAYER_TYPE_SOFTWARE) {
+ // Layered parents should be invalidated. Escalate to a full invalidate (and note that
+ // we do this after consuming any relevant flags from the originating descendant)
+ mPrivateFlags |= PFLAG_INVALIDATED | PFLAG_DIRTY;
+ target = this;
+ }
+
+ if (mParent != null) {
+ mParent.onDescendantInvalidated(this, target);
+ }
+ }
+
+
+ /**
+ * Don't call or override this method. It is used for the implementation of
+ * the view hierarchy.
+ *
+ * @deprecated Use {@link #onDescendantInvalidated(View, View)} instead to observe updates to
+ * draw state in descendants.
+ */
+ @Deprecated
+ @Override
+ public final void invalidateChild(View child, final Rect dirty) {
+ final AttachInfo attachInfo = mAttachInfo;
+ if (attachInfo != null && attachInfo.mHardwareAccelerated) {
+ // HW accelerated fast path
+ onDescendantInvalidated(child, child);
+ return;
+ }
+
+ ViewParent parent = this;
+ 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 & PFLAG_DRAW_ANIMATION) != 0;
+
+ // 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 ? PFLAG_DIRTY_OPAQUE : PFLAG_DIRTY;
+
+ if (child.mLayerType != LAYER_TYPE_NONE) {
+ mPrivateFlags |= PFLAG_INVALIDATED;
+ mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
+ }
+
+ final int[] location = attachInfo.mInvalidateChildLocation;
+ location[CHILD_LEFT_INDEX] = child.mLeft;
+ location[CHILD_TOP_INDEX] = child.mTop;
+ if (!childMatrix.isIdentity() ||
+ (mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) {
+ RectF boundingRect = attachInfo.mTmpTransformRect;
+ boundingRect.set(dirty);
+ Matrix transformMatrix;
+ if ((mGroupFlags & ViewGroup.FLAG_SUPPORT_STATIC_TRANSFORMATIONS) != 0) {
+ Transformation t = attachInfo.mTmpTransformation;
+ boolean transformed = getChildStaticTransformation(child, t);
+ if (transformed) {
+ transformMatrix = attachInfo.mTmpMatrix;
+ transformMatrix.set(t.getMatrix());
+ if (!childMatrix.isIdentity()) {
+ transformMatrix.preConcat(childMatrix);
+ }
+ } else {
+ transformMatrix = childMatrix;
+ }
+ } else {
+ transformMatrix = childMatrix;
+ }
+ transformMatrix.mapRect(boundingRect);
+ dirty.set((int) Math.floor(boundingRect.left),
+ (int) Math.floor(boundingRect.top),
+ (int) Math.ceil(boundingRect.right),
+ (int) Math.ceil(boundingRect.bottom));
+ }
+
+ do {
+ View view = null;
+ if (parent instanceof View) {
+ view = (View) parent;
+ }
+
+ if (drawAnimation) {
+ if (view != null) {
+ view.mPrivateFlags |= PFLAG_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 = PFLAG_DIRTY;
+ }
+ if ((view.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) {
+ view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_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) Math.floor(boundingRect.left),
+ (int) Math.floor(boundingRect.top),
+ (int) Math.ceil(boundingRect.right),
+ (int) Math.ceil(boundingRect.bottom));
+ }
+ }
+ } 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.
+ *
+ * @deprecated Use {@link #onDescendantInvalidated(View, View)} instead to observe updates to
+ * draw state in descendants.
+ */
+ @Deprecated
+ @Override
+ public ViewParent invalidateChildInParent(final int[] location, final Rect dirty) {
+ if ((mPrivateFlags & (PFLAG_DRAWN | PFLAG_DRAWING_CACHE_VALID)) != 0) {
+ // either DRAWN, or 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);
+ if ((mGroupFlags & FLAG_CLIP_CHILDREN) == 0) {
+ dirty.union(0, 0, mRight - mLeft, mBottom - mTop);
+ }
+
+ final int left = mLeft;
+ final int top = mTop;
+
+ if ((mGroupFlags & FLAG_CLIP_CHILDREN) == FLAG_CLIP_CHILDREN) {
+ if (!dirty.intersect(0, 0, mRight - left, mBottom - top)) {
+ dirty.setEmpty();
+ }
+ }
+
+ location[CHILD_LEFT_INDEX] = left;
+ location[CHILD_TOP_INDEX] = top;
+ } else {
+
+ 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);
+ }
+ location[CHILD_LEFT_INDEX] = mLeft;
+ location[CHILD_TOP_INDEX] = mTop;
+
+ mPrivateFlags &= ~PFLAG_DRAWN;
+ }
+ mPrivateFlags &= ~PFLAG_DRAWING_CACHE_VALID;
+ if (mLayerType != LAYER_TYPE_NONE) {
+ mPrivateFlags |= PFLAG_INVALIDATED;
+ }
+
+ 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;
+ boolean intersected = rect.intersect(0, 0, p.mRight - p.mLeft,
+ p.mBottom - p.mTop);
+ if (!intersected) {
+ rect.setEmpty();
+ }
+ }
+ } else {
+ if (clipToBounds) {
+ View p = (View) theParent;
+ boolean intersected = rect.intersect(0, 0, p.mRight - p.mLeft,
+ p.mBottom - p.mTop);
+ if (!intersected) {
+ rect.setEmpty();
+ }
+ }
+ 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;
+ boolean invalidate = false;
+
+ for (int i = 0; i < count; i++) {
+ final View v = children[i];
+ v.mTop += offset;
+ v.mBottom += offset;
+ if (v.mRenderNode != null) {
+ invalidate = true;
+ v.mRenderNode.offsetTopAndBottom(offset);
+ }
+ }
+
+ if (invalidate) {
+ invalidateViewProperty(false, false);
+ }
+ notifySubtreeAccessibilityStateChangedIfNeeded();
+ }
+
+ @Override
+ public boolean getChildVisibleRect(View child, Rect r, android.graphics.Point offset) {
+ return getChildVisibleRect(child, r, offset, false);
+ }
+
+ /**
+ * @param forceParentCheck true to guarantee that this call will propagate to all ancestors,
+ * false otherwise
+ *
+ * @hide
+ */
+ public boolean getChildVisibleRect(
+ View child, Rect r, android.graphics.Point offset, boolean forceParentCheck) {
+ // 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);
+ }
+
+ final int dx = child.mLeft - mScrollX;
+ final 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 = Math.round(position[0]);
+ offset.y = Math.round(position[1]);
+ }
+ offset.x += dx;
+ offset.y += dy;
+ }
+
+ final int width = mRight - mLeft;
+ final int height = mBottom - mTop;
+
+ boolean rectIsVisible = true;
+ if (mParent == null ||
+ (mParent instanceof ViewGroup && ((ViewGroup) mParent).getClipChildren())) {
+ // Clip to bounds.
+ rectIsVisible = rect.intersect(0, 0, width, height);
+ }
+
+ if ((forceParentCheck || rectIsVisible)
+ && (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK) {
+ // Clip to padding.
+ rectIsVisible = rect.intersect(mPaddingLeft, mPaddingTop,
+ width - mPaddingRight, height - mPaddingBottom);
+ }
+
+ if ((forceParentCheck || rectIsVisible) && mClipBounds != null) {
+ // Clip to clipBounds.
+ rectIsVisible = rect.intersect(mClipBounds.left, mClipBounds.top, mClipBounds.right,
+ mClipBounds.bottom);
+ }
+ r.set((int) Math.floor(rect.left), (int) Math.floor(rect.top),
+ (int) Math.ceil(rect.right), (int) Math.ceil(rect.bottom));
+
+ if ((forceParentCheck || rectIsVisible) && mParent != null) {
+ if (mParent instanceof ViewGroup) {
+ rectIsVisible = ((ViewGroup) mParent)
+ .getChildVisibleRect(this, r, offset, forceParentCheck);
+ } else {
+ rectIsVisible = mParent.getChildVisibleRect(this, r, offset);
+ }
+ }
+ return rectIsVisible;
+ }
+
+ @Override
+ public final void layout(int l, int t, int r, int b) {
+ if (!mSuppressLayout && (mTransition == null || !mTransition.isChangingLayout())) {
+ if (mTransition != null) {
+ mTransition.layoutChange(this);
+ }
+ super.layout(l, t, r, b);
+ } else {
+ // record the fact that we noop'd it; request layout when transition finishes
+ mLayoutCalledWhileSuppressed = true;
+ }
+ }
+
+ @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)
+ *
+ * @deprecated As of {@link android.os.Build.VERSION_CODES#M}, this property is ignored.
+ * Caching behavior of children may be controlled through {@link View#setLayerType(int, Paint)}.
+ */
+ @Deprecated
+ 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)
+ *
+ * @deprecated As of {@link android.os.Build.VERSION_CODES#M}, this property is ignored.
+ * Caching behavior of children may be controlled through {@link View#setLayerType(int, Paint)}.
+ */
+ @Deprecated
+ 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)
+ *
+ * @deprecated As of {@link android.os.Build.VERSION_CODES#M}, this property is ignored.
+ * Child views may no longer have their caching behavior disabled by parents.
+ */
+ @Deprecated
+ 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)
+ *
+ * @deprecated As of {@link android.os.Build.VERSION_CODES#M}, this property is ignored.
+ * Child views may no longer have their caching behavior disabled by parents.
+ */
+ @Deprecated
+ 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)
+ *
+ * @deprecated As of {@link android.os.Build.VERSION_CODES#M}, this property is ignored.
+ * Child views may no longer be forced to cache their rendering state by their parents.
+ * Use {@link View#setLayerType(int, Paint)} on individual Views instead.
+ */
+ @Deprecated
+ 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()
+ *
+ * @deprecated As of {@link android.os.Build.VERSION_CODES#M}, this property is ignored.
+ * Child views may no longer be forced to cache their rendering state by their parents.
+ * Use {@link View#setLayerType(int, Paint)} on individual Views instead.
+ */
+ @Deprecated
+ 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)}.
+ * <p>
+ * Note that {@link View#getZ() Z} reordering, done by {@link #dispatchDraw(Canvas)},
+ * will override custom child ordering done via this method.
+ *
+ * @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 boolean hasBooleanFlag(int flag) {
+ return (mGroupFlags & flag) == flag;
+ }
+
+ 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;
+ }
+
+ private void setLayoutMode(int layoutMode, boolean explicitly) {
+ mLayoutMode = layoutMode;
+ setBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET, explicitly);
+ }
+
+ /**
+ * Recursively traverse the view hierarchy, resetting the layoutMode of any
+ * descendants that had inherited a different layoutMode from a previous parent.
+ * Recursion terminates when a descendant's mode is:
+ * <ul>
+ * <li>Undefined</li>
+ * <li>The same as the root node's</li>
+ * <li>A mode that had been explicitly set</li>
+ * <ul/>
+ * The first two clauses are optimizations.
+ * @param layoutModeOfRoot
+ */
+ @Override
+ void invalidateInheritedLayoutMode(int layoutModeOfRoot) {
+ if (mLayoutMode == LAYOUT_MODE_UNDEFINED ||
+ mLayoutMode == layoutModeOfRoot ||
+ hasBooleanFlag(FLAG_LAYOUT_MODE_WAS_EXPLICITLY_SET)) {
+ return;
+ }
+ setLayoutMode(LAYOUT_MODE_UNDEFINED, false);
+
+ // apply recursively
+ for (int i = 0, N = getChildCount(); i < N; i++) {
+ getChildAt(i).invalidateInheritedLayoutMode(layoutModeOfRoot);
+ }
+ }
+
+ /**
+ * Returns the basis of alignment during layout operations on this ViewGroup:
+ * either {@link #LAYOUT_MODE_CLIP_BOUNDS} or {@link #LAYOUT_MODE_OPTICAL_BOUNDS}.
+ * <p>
+ * If no layoutMode was explicitly set, either programmatically or in an XML resource,
+ * the method returns the layoutMode of the view's parent ViewGroup if such a parent exists,
+ * otherwise the method returns a default value of {@link #LAYOUT_MODE_CLIP_BOUNDS}.
+ *
+ * @return the layout mode to use during layout operations
+ *
+ * @see #setLayoutMode(int)
+ */
+ public int getLayoutMode() {
+ if (mLayoutMode == LAYOUT_MODE_UNDEFINED) {
+ int inheritedLayoutMode = (mParent instanceof ViewGroup) ?
+ ((ViewGroup) mParent).getLayoutMode() : LAYOUT_MODE_DEFAULT;
+ setLayoutMode(inheritedLayoutMode, false);
+ }
+ return mLayoutMode;
+ }
+
+ /**
+ * Sets the basis of alignment during the layout of this ViewGroup.
+ * Valid values are either {@link #LAYOUT_MODE_CLIP_BOUNDS} or
+ * {@link #LAYOUT_MODE_OPTICAL_BOUNDS}.
+ *
+ * @param layoutMode the layout mode to use during layout operations
+ *
+ * @see #getLayoutMode()
+ * @attr ref android.R.styleable#ViewGroup_layoutMode
+ */
+ public void setLayoutMode(int layoutMode) {
+ if (mLayoutMode != layoutMode) {
+ invalidateInheritedLayoutMode(layoutMode);
+ setLayoutMode(layoutMode, layoutMode != LAYOUT_MODE_UNDEFINED);
+ requestLayout();
+ }
+ }
+
+ /**
+ * 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);
+ }
+
+ @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);
+ mFocused.debug(depth + 1);
+ }
+ if (mDefaultFocus != null) {
+ output = debugIndent(depth);
+ output += "mDefaultFocus";
+ Log.d(VIEW_LOG_TAG, output);
+ mDefaultFocus.debug(depth + 1);
+ }
+ if (mFocusedInCluster != null) {
+ output = debugIndent(depth);
+ output += "mFocusedInCluster";
+ Log.d(VIEW_LOG_TAG, output);
+ mFocusedInCluster.debug(depth + 1);
+ }
+ 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 = View.sUseZeroUnspecifiedMeasureSpec ? 0 : size;
+ resultMode = MeasureSpec.UNSPECIFIED;
+ } else if (childDimension == LayoutParams.WRAP_CONTENT) {
+ // Child wants to determine its own size.... find out how
+ // big it should be
+ resultSize = View.sUseZeroUnspecifiedMeasureSpec ? 0 : size;
+ resultMode = MeasureSpec.UNSPECIFIED;
+ }
+ break;
+ }
+ //noinspection ResourceType
+ 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() {
+ final ArrayList<View> disappearingChildren = mDisappearingChildren;
+ if (disappearingChildren != null) {
+ final int count = disappearingChildren.size();
+ for (int i = 0; i < count; i++) {
+ final View view = disappearingChildren.get(i);
+ if (view.mAttachInfo != null) {
+ view.dispatchDetachedFromWindow();
+ }
+ view.clearAnimation();
+ }
+ disappearingChildren.clear();
+ invalidate();
+ }
+ }
+
+ /**
+ * 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 & PFLAG_ANIMATION_STARTED) == PFLAG_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 &= ~PFLAG_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;
+ }
+ }
+ invalidate();
+ }
+ }
+ }
+
+ 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 (mLayoutCalledWhileSuppressed && !transition.isChangingLayout()) {
+ requestLayout();
+ mLayoutCalledWhileSuppressed = false;
+ }
+ if (transitionType == LayoutTransition.DISAPPEARING && mTransitioningViews != null) {
+ endViewTransition(view);
+ }
+ }
+ };
+
+ /**
+ * Tells this ViewGroup to suppress all layout() calls until layout
+ * suppression is disabled with a later call to suppressLayout(false).
+ * When layout suppression is disabled, a requestLayout() call is sent
+ * if layout() was attempted while layout was being suppressed.
+ *
+ * @hide
+ */
+ public void suppressLayout(boolean suppress) {
+ mSuppressLayout = suppress;
+ if (!suppress) {
+ if (mLayoutCalledWhileSuppressed) {
+ requestLayout();
+ mLayoutCalledWhileSuppressed = false;
+ }
+ }
+ }
+
+ /**
+ * Returns whether layout calls on this container are currently being
+ * suppressed, due to an earlier call to {@link #suppressLayout(boolean)}.
+ *
+ * @return true if layout calls are currently suppressed, false otherwise.
+ *
+ * @hide
+ */
+ public boolean isLayoutSuppressed() {
+ return mSuppressLayout;
+ }
+
+ @Override
+ public boolean gatherTransparentRegion(Region region) {
+ // If no transparent regions requested, we are always opaque.
+ final boolean meOpaque = (mPrivateFlags & View.PFLAG_REQUEST_TRANSPARENT_REGIONS) == 0;
+ if (meOpaque && region == null) {
+ // The caller doesn't care about the region, so stop now.
+ return true;
+ }
+ super.gatherTransparentRegion(region);
+ // Instead of naively traversing the view tree, we have to traverse according to the Z
+ // order here. We need to go with the same order as dispatchDraw().
+ // One example is that after surfaceView punch a hole, we will still allow other views drawn
+ // on top of that hole. In this case, those other views should be able to cut the
+ // transparent region into smaller area.
+ final int childrenCount = mChildrenCount;
+ boolean noneOfTheChildrenAreTransparent = true;
+ if (childrenCount > 0) {
+ final ArrayList<View> preorderedList = buildOrderedChildList();
+ final boolean customOrder = preorderedList == null
+ && isChildrenDrawingOrderEnabled();
+ final View[] children = mChildren;
+ for (int i = 0; i < childrenCount; i++) {
+ final int childIndex = getAndVerifyPreorderedIndex(childrenCount, i, customOrder);
+ final View child = getAndVerifyPreorderedView(preorderedList, children, childIndex);
+ if ((child.mViewFlags & VISIBILITY_MASK) == VISIBLE || child.getAnimation() != null) {
+ if (!child.gatherTransparentRegion(region)) {
+ noneOfTheChildrenAreTransparent = false;
+ }
+ }
+ }
+ if (preorderedList != null) preorderedList.clear();
+ }
+ return meOpaque || noneOfTheChildrenAreTransparent;
+ }
+
+ @Override
+ public void requestTransparentRegion(View child) {
+ if (child != null) {
+ child.mPrivateFlags |= View.PFLAG_REQUEST_TRANSPARENT_REGIONS;
+ if (mParent != null) {
+ mParent.requestTransparentRegion(this);
+ }
+ }
+ }
+
+ @Override
+ public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) {
+ insets = super.dispatchApplyWindowInsets(insets);
+ if (!insets.isConsumed()) {
+ final int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ insets = getChildAt(i).dispatchApplyWindowInsets(insets);
+ if (insets.isConsumed()) {
+ break;
+ }
+ }
+ }
+ return insets;
+ }
+
+ /**
+ * 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).
+ */
+ @Override
+ 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);
+ }
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public boolean resolveRtlPropertiesIfNeeded() {
+ final boolean result = super.resolveRtlPropertiesIfNeeded();
+ // We dont need to resolve the children RTL properties if nothing has changed for the parent
+ if (result) {
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ final View child = getChildAt(i);
+ if (child.isLayoutDirectionInherited()) {
+ child.resolveRtlPropertiesIfNeeded();
+ }
+ }
+ }
+ return result;
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public boolean resolveLayoutDirection() {
+ final boolean result = super.resolveLayoutDirection();
+ if (result) {
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ final View child = getChildAt(i);
+ if (child.isLayoutDirectionInherited()) {
+ child.resolveLayoutDirection();
+ }
+ }
+ }
+ return result;
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public boolean resolveTextDirection() {
+ final boolean result = super.resolveTextDirection();
+ if (result) {
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ final View child = getChildAt(i);
+ if (child.isTextDirectionInherited()) {
+ child.resolveTextDirection();
+ }
+ }
+ }
+ return result;
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public boolean resolveTextAlignment() {
+ final boolean result = super.resolveTextAlignment();
+ if (result) {
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ final View child = getChildAt(i);
+ if (child.isTextAlignmentInherited()) {
+ child.resolveTextAlignment();
+ }
+ }
+ }
+ return result;
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public void resolvePadding() {
+ super.resolvePadding();
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ final View child = getChildAt(i);
+ if (child.isLayoutDirectionInherited() && !child.isPaddingResolved()) {
+ child.resolvePadding();
+ }
+ }
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ protected void resolveDrawables() {
+ super.resolveDrawables();
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ final View child = getChildAt(i);
+ if (child.isLayoutDirectionInherited() && !child.areDrawablesResolved()) {
+ child.resolveDrawables();
+ }
+ }
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public void resolveLayoutParams() {
+ super.resolveLayoutParams();
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ final View child = getChildAt(i);
+ child.resolveLayoutParams();
+ }
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public void resetResolvedLayoutDirection() {
+ super.resetResolvedLayoutDirection();
+
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ final View child = getChildAt(i);
+ if (child.isLayoutDirectionInherited()) {
+ child.resetResolvedLayoutDirection();
+ }
+ }
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public void resetResolvedTextDirection() {
+ super.resetResolvedTextDirection();
+
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ final View child = getChildAt(i);
+ if (child.isTextDirectionInherited()) {
+ child.resetResolvedTextDirection();
+ }
+ }
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public void resetResolvedTextAlignment() {
+ super.resetResolvedTextAlignment();
+
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ final View child = getChildAt(i);
+ if (child.isTextAlignmentInherited()) {
+ child.resetResolvedTextAlignment();
+ }
+ }
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ public void resetResolvedPadding() {
+ super.resetResolvedPadding();
+
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ final View child = getChildAt(i);
+ if (child.isLayoutDirectionInherited()) {
+ child.resetResolvedPadding();
+ }
+ }
+ }
+
+ /**
+ * @hide
+ */
+ @Override
+ protected void resetResolvedDrawables() {
+ super.resetResolvedDrawables();
+
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ final View child = getChildAt(i);
+ if (child.isLayoutDirectionInherited()) {
+ child.resetResolvedDrawables();
+ }
+ }
+ }
+
+ /**
+ * 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;
+ }
+
+ /**
+ * @inheritDoc
+ */
+ @Override
+ public boolean onStartNestedScroll(View child, View target, int nestedScrollAxes) {
+ return false;
+ }
+
+ /**
+ * @inheritDoc
+ */
+ @Override
+ public void onNestedScrollAccepted(View child, View target, int axes) {
+ mNestedScrollAxes = axes;
+ }
+
+ /**
+ * @inheritDoc
+ *
+ * <p>The default implementation of onStopNestedScroll calls
+ * {@link #stopNestedScroll()} to halt any recursive nested scrolling in progress.</p>
+ */
+ @Override
+ public void onStopNestedScroll(View child) {
+ // Stop any recursive nested scrolling.
+ stopNestedScroll();
+ mNestedScrollAxes = 0;
+ }
+
+ /**
+ * @inheritDoc
+ */
+ @Override
+ public void onNestedScroll(View target, int dxConsumed, int dyConsumed,
+ int dxUnconsumed, int dyUnconsumed) {
+ // Re-dispatch up the tree by default
+ dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, null);
+ }
+
+ /**
+ * @inheritDoc
+ */
+ @Override
+ public void onNestedPreScroll(View target, int dx, int dy, int[] consumed) {
+ // Re-dispatch up the tree by default
+ dispatchNestedPreScroll(dx, dy, consumed, null);
+ }
+
+ /**
+ * @inheritDoc
+ */
+ @Override
+ public boolean onNestedFling(View target, float velocityX, float velocityY, boolean consumed) {
+ // Re-dispatch up the tree by default
+ return dispatchNestedFling(velocityX, velocityY, consumed);
+ }
+
+ /**
+ * @inheritDoc
+ */
+ @Override
+ public boolean onNestedPreFling(View target, float velocityX, float velocityY) {
+ // Re-dispatch up the tree by default
+ return dispatchNestedPreFling(velocityX, velocityY);
+ }
+
+ /**
+ * Return the current axes of nested scrolling for this ViewGroup.
+ *
+ * <p>A ViewGroup returning something other than {@link #SCROLL_AXIS_NONE} is currently
+ * acting as a nested scrolling parent for one or more descendant views in the hierarchy.</p>
+ *
+ * @return Flags indicating the current axes of nested scrolling
+ * @see #SCROLL_AXIS_HORIZONTAL
+ * @see #SCROLL_AXIS_VERTICAL
+ * @see #SCROLL_AXIS_NONE
+ */
+ public int getNestedScrollAxes() {
+ return mNestedScrollAxes;
+ }
+
+ /** @hide */
+ protected void onSetLayoutParams(View child, LayoutParams layoutParams) {
+ requestLayout();
+ }
+
+ /** @hide */
+ @Override
+ public void captureTransitioningViews(List<View> transitioningViews) {
+ if (getVisibility() != View.VISIBLE) {
+ return;
+ }
+ if (isTransitionGroup()) {
+ transitioningViews.add(this);
+ } else {
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ View child = getChildAt(i);
+ child.captureTransitioningViews(transitioningViews);
+ }
+ }
+ }
+
+ /** @hide */
+ @Override
+ public void findNamedViews(Map<String, View> namedElements) {
+ if (getVisibility() != VISIBLE && mGhostView == null) {
+ return;
+ }
+ super.findNamedViews(namedElements);
+ int count = getChildCount();
+ for (int i = 0; i < count; i++) {
+ View child = getChildAt(i);
+ child.findNamedViews(namedElements);
+ }
+ }
+
+ /**
+ * 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 resolveLayoutDirection(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) + " }";
+ }
+
+ /**
+ * Use {@code canvas} to draw suitable debugging annotations for these LayoutParameters.
+ *
+ * <p>This function is called automatically when the developer setting is enabled.<p/>
+ *
+ * <p>It is strongly advised to only call this function from debug builds as there is
+ * a risk of leaking unwanted layout information.<p/>
+ *
+ * @param view the view that contains these layout parameters
+ * @param canvas the canvas on which to draw
+ * @param paint the paint used to draw through
+ */
+ public void onDebugDraw(View view, Canvas canvas, Paint paint) {
+ }
+
+ /**
+ * 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);
+ }
+
+ /** @hide */
+ void encode(@NonNull ViewHierarchyEncoder encoder) {
+ encoder.beginObject(this);
+ encodeProperties(encoder);
+ encoder.endObject();
+ }
+
+ /** @hide */
+ protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) {
+ encoder.addProperty("width", width);
+ encoder.addProperty("height", height);
+ }
+ }
+
+ /**
+ * 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.
+ *
+ * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_margin
+ * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginHorizontal
+ * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginVertical
+ * @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
+ * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart
+ * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd
+ */
+ public static class MarginLayoutParams extends ViewGroup.LayoutParams {
+ /**
+ * The left margin in pixels of the child. Margin values should be positive.
+ * 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. Margin values should be positive.
+ * 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. Margin values should be positive.
+ * 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. Margin values should be positive.
+ * 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. Margin values should be positive.
+ * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value
+ * to this field.
+ */
+ @ViewDebug.ExportedProperty(category = "layout")
+ private int startMargin = DEFAULT_MARGIN_RELATIVE;
+
+ /**
+ * The end margin in pixels of the child. Margin values should be positive.
+ * Call {@link ViewGroup#setLayoutParams(LayoutParams)} after reassigning a new value
+ * to this field.
+ */
+ @ViewDebug.ExportedProperty(category = "layout")
+ private int endMargin = DEFAULT_MARGIN_RELATIVE;
+
+ /**
+ * The default start and end margin.
+ * @hide
+ */
+ public static final int DEFAULT_MARGIN_RELATIVE = Integer.MIN_VALUE;
+
+ /**
+ * Bit 0: layout direction
+ * Bit 1: layout direction
+ * Bit 2: left margin undefined
+ * Bit 3: right margin undefined
+ * Bit 4: is RTL compatibility mode
+ * Bit 5: need resolution
+ *
+ * Bit 6 to 7 not used
+ *
+ * @hide
+ */
+ @ViewDebug.ExportedProperty(category = "layout", flagMapping = {
+ @ViewDebug.FlagToString(mask = LAYOUT_DIRECTION_MASK,
+ equals = LAYOUT_DIRECTION_MASK, name = "LAYOUT_DIRECTION"),
+ @ViewDebug.FlagToString(mask = LEFT_MARGIN_UNDEFINED_MASK,
+ equals = LEFT_MARGIN_UNDEFINED_MASK, name = "LEFT_MARGIN_UNDEFINED_MASK"),
+ @ViewDebug.FlagToString(mask = RIGHT_MARGIN_UNDEFINED_MASK,
+ equals = RIGHT_MARGIN_UNDEFINED_MASK, name = "RIGHT_MARGIN_UNDEFINED_MASK"),
+ @ViewDebug.FlagToString(mask = RTL_COMPATIBILITY_MODE_MASK,
+ equals = RTL_COMPATIBILITY_MODE_MASK, name = "RTL_COMPATIBILITY_MODE_MASK"),
+ @ViewDebug.FlagToString(mask = NEED_RESOLUTION_MASK,
+ equals = NEED_RESOLUTION_MASK, name = "NEED_RESOLUTION_MASK")
+ }, formatToHexString = true)
+ byte mMarginFlags;
+
+ private static final int LAYOUT_DIRECTION_MASK = 0x00000003;
+ private static final int LEFT_MARGIN_UNDEFINED_MASK = 0x00000004;
+ private static final int RIGHT_MARGIN_UNDEFINED_MASK = 0x00000008;
+ private static final int RTL_COMPATIBILITY_MODE_MASK = 0x00000010;
+ private static final int NEED_RESOLUTION_MASK = 0x00000020;
+
+ private static final int DEFAULT_MARGIN_RESOLVED = 0;
+ private static final int UNDEFINED_MARGIN = DEFAULT_MARGIN_RELATIVE;
+
+ /**
+ * 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 {
+ int horizontalMargin = a.getDimensionPixelSize(
+ R.styleable.ViewGroup_MarginLayout_layout_marginHorizontal, -1);
+ int verticalMargin = a.getDimensionPixelSize(
+ R.styleable.ViewGroup_MarginLayout_layout_marginVertical, -1);
+
+ if (horizontalMargin >= 0) {
+ leftMargin = horizontalMargin;
+ rightMargin = horizontalMargin;
+ } else {
+ leftMargin = a.getDimensionPixelSize(
+ R.styleable.ViewGroup_MarginLayout_layout_marginLeft,
+ UNDEFINED_MARGIN);
+ if (leftMargin == UNDEFINED_MARGIN) {
+ mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK;
+ leftMargin = DEFAULT_MARGIN_RESOLVED;
+ }
+ rightMargin = a.getDimensionPixelSize(
+ R.styleable.ViewGroup_MarginLayout_layout_marginRight,
+ UNDEFINED_MARGIN);
+ if (rightMargin == UNDEFINED_MARGIN) {
+ mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK;
+ rightMargin = DEFAULT_MARGIN_RESOLVED;
+ }
+ }
+
+ startMargin = a.getDimensionPixelSize(
+ R.styleable.ViewGroup_MarginLayout_layout_marginStart,
+ DEFAULT_MARGIN_RELATIVE);
+ endMargin = a.getDimensionPixelSize(
+ R.styleable.ViewGroup_MarginLayout_layout_marginEnd,
+ DEFAULT_MARGIN_RELATIVE);
+
+ if (verticalMargin >= 0) {
+ topMargin = verticalMargin;
+ bottomMargin = verticalMargin;
+ } else {
+ topMargin = a.getDimensionPixelSize(
+ R.styleable.ViewGroup_MarginLayout_layout_marginTop,
+ DEFAULT_MARGIN_RESOLVED);
+ bottomMargin = a.getDimensionPixelSize(
+ R.styleable.ViewGroup_MarginLayout_layout_marginBottom,
+ DEFAULT_MARGIN_RESOLVED);
+ }
+
+ if (isMarginRelative()) {
+ mMarginFlags |= NEED_RESOLUTION_MASK;
+ }
+ }
+
+ final boolean hasRtlSupport = c.getApplicationInfo().hasRtlSupport();
+ final int targetSdkVersion = c.getApplicationInfo().targetSdkVersion;
+ if (targetSdkVersion < JELLY_BEAN_MR1 || !hasRtlSupport) {
+ mMarginFlags |= RTL_COMPATIBILITY_MODE_MASK;
+ }
+
+ // Layout direction is LTR by default
+ mMarginFlags |= LAYOUT_DIRECTION_LTR;
+
+ a.recycle();
+ }
+
+ public MarginLayoutParams(int width, int height) {
+ super(width, height);
+
+ mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK;
+ mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK;
+
+ mMarginFlags &= ~NEED_RESOLUTION_MASK;
+ mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK;
+ }
+
+ /**
+ * 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;
+
+ this.mMarginFlags = source.mMarginFlags;
+ }
+
+ public MarginLayoutParams(LayoutParams source) {
+ super(source);
+
+ mMarginFlags |= LEFT_MARGIN_UNDEFINED_MASK;
+ mMarginFlags |= RIGHT_MARGIN_UNDEFINED_MASK;
+
+ mMarginFlags &= ~NEED_RESOLUTION_MASK;
+ mMarginFlags &= ~RTL_COMPATIBILITY_MODE_MASK;
+ }
+
+ /**
+ * @hide Used internally.
+ */
+ public final void copyMarginsFrom(MarginLayoutParams source) {
+ this.leftMargin = source.leftMargin;
+ this.topMargin = source.topMargin;
+ this.rightMargin = source.rightMargin;
+ this.bottomMargin = source.bottomMargin;
+ this.startMargin = source.startMargin;
+ this.endMargin = source.endMargin;
+
+ this.mMarginFlags = source.mMarginFlags;
+ }
+
+ /**
+ * 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.
+ * Margin values should be positive.
+ *
+ * @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;
+ mMarginFlags &= ~LEFT_MARGIN_UNDEFINED_MASK;
+ mMarginFlags &= ~RIGHT_MARGIN_UNDEFINED_MASK;
+ if (isMarginRelative()) {
+ mMarginFlags |= NEED_RESOLUTION_MASK;
+ } else {
+ mMarginFlags &= ~NEED_RESOLUTION_MASK;
+ }
+ }
+
+ /**
+ * 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. Margin values should be positive.
+ *
+ * @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;
+ mMarginFlags |= NEED_RESOLUTION_MASK;
+ }
+
+ /**
+ * Sets the relative start margin. Margin values should be positive.
+ *
+ * @param start the start margin size
+ *
+ * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart
+ */
+ public void setMarginStart(int start) {
+ startMargin = start;
+ mMarginFlags |= NEED_RESOLUTION_MASK;
+ }
+
+ /**
+ * Returns the start margin in pixels.
+ *
+ * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginStart
+ *
+ * @return the start margin in pixels.
+ */
+ public int getMarginStart() {
+ if (startMargin != DEFAULT_MARGIN_RELATIVE) return startMargin;
+ if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) {
+ doResolveMargins();
+ }
+ switch(mMarginFlags & LAYOUT_DIRECTION_MASK) {
+ case View.LAYOUT_DIRECTION_RTL:
+ return rightMargin;
+ case View.LAYOUT_DIRECTION_LTR:
+ default:
+ return leftMargin;
+ }
+ }
+
+ /**
+ * Sets the relative end margin. Margin values should be positive.
+ *
+ * @param end the end margin size
+ *
+ * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd
+ */
+ public void setMarginEnd(int end) {
+ endMargin = end;
+ mMarginFlags |= NEED_RESOLUTION_MASK;
+ }
+
+ /**
+ * Returns the end margin in pixels.
+ *
+ * @attr ref android.R.styleable#ViewGroup_MarginLayout_layout_marginEnd
+ *
+ * @return the end margin in pixels.
+ */
+ public int getMarginEnd() {
+ if (endMargin != DEFAULT_MARGIN_RELATIVE) return endMargin;
+ if ((mMarginFlags & NEED_RESOLUTION_MASK) == NEED_RESOLUTION_MASK) {
+ doResolveMargins();
+ }
+ switch(mMarginFlags & LAYOUT_DIRECTION_MASK) {
+ case View.LAYOUT_DIRECTION_RTL:
+ return leftMargin;
+ case View.LAYOUT_DIRECTION_LTR:
+ default:
+ return rightMargin;
+ }
+ }
+
+ /**
+ * 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_MARGIN_RELATIVE || endMargin != DEFAULT_MARGIN_RELATIVE);
+ }
+
+ /**
+ * Set the layout direction
+ * @param layoutDirection the layout direction.
+ * Should be either {@link View#LAYOUT_DIRECTION_LTR}
+ * or {@link View#LAYOUT_DIRECTION_RTL}.
+ */
+ public void setLayoutDirection(int layoutDirection) {
+ if (layoutDirection != View.LAYOUT_DIRECTION_LTR &&
+ layoutDirection != View.LAYOUT_DIRECTION_RTL) return;
+ if (layoutDirection != (mMarginFlags & LAYOUT_DIRECTION_MASK)) {
+ mMarginFlags &= ~LAYOUT_DIRECTION_MASK;
+ mMarginFlags |= (layoutDirection & LAYOUT_DIRECTION_MASK);
+ if (isMarginRelative()) {
+ mMarginFlags |= NEED_RESOLUTION_MASK;
+ } else {
+ mMarginFlags &= ~NEED_RESOLUTION_MASK;
+ }
+ }
+ }
+
+ /**
+ * Retuns the layout direction. Can be either {@link View#LAYOUT_DIRECTION_LTR} or
+ * {@link View#LAYOUT_DIRECTION_RTL}.
+ *
+ * @return the layout direction.
+ */
+ public int getLayoutDirection() {
+ return (mMarginFlags & LAYOUT_DIRECTION_MASK);
+ }
+
+ /**
+ * This will be called by {@link android.view.View#requestLayout()}. Left and Right margins
+ * may be overridden depending on layout direction.
+ */
+ @Override
+ public void resolveLayoutDirection(int layoutDirection) {
+ setLayoutDirection(layoutDirection);
+
+ // No relative margin or pre JB-MR1 case or no need to resolve, just dont do anything
+ // Will use the left and right margins if no relative margin is defined.
+ if (!isMarginRelative() ||
+ (mMarginFlags & NEED_RESOLUTION_MASK) != NEED_RESOLUTION_MASK) return;
+
+ // Proceed with resolution
+ doResolveMargins();
+ }
+
+ private void doResolveMargins() {
+ if ((mMarginFlags & RTL_COMPATIBILITY_MODE_MASK) == RTL_COMPATIBILITY_MODE_MASK) {
+ // if left or right margins are not defined and if we have some start or end margin
+ // defined then use those start and end margins.
+ if ((mMarginFlags & LEFT_MARGIN_UNDEFINED_MASK) == LEFT_MARGIN_UNDEFINED_MASK
+ && startMargin > DEFAULT_MARGIN_RELATIVE) {
+ leftMargin = startMargin;
+ }
+ if ((mMarginFlags & RIGHT_MARGIN_UNDEFINED_MASK) == RIGHT_MARGIN_UNDEFINED_MASK
+ && endMargin > DEFAULT_MARGIN_RELATIVE) {
+ rightMargin = endMargin;
+ }
+ } else {
+ // We have some relative margins (either the start one or the end one or both). So use
+ // them and override what has been defined for left and right margins. If either start
+ // or end margin is not defined, just set it to default "0".
+ switch(mMarginFlags & LAYOUT_DIRECTION_MASK) {
+ case View.LAYOUT_DIRECTION_RTL:
+ leftMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ?
+ endMargin : DEFAULT_MARGIN_RESOLVED;
+ rightMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ?
+ startMargin : DEFAULT_MARGIN_RESOLVED;
+ break;
+ case View.LAYOUT_DIRECTION_LTR:
+ default:
+ leftMargin = (startMargin > DEFAULT_MARGIN_RELATIVE) ?
+ startMargin : DEFAULT_MARGIN_RESOLVED;
+ rightMargin = (endMargin > DEFAULT_MARGIN_RELATIVE) ?
+ endMargin : DEFAULT_MARGIN_RESOLVED;
+ break;
+ }
+ }
+ mMarginFlags &= ~NEED_RESOLUTION_MASK;
+ }
+
+ /**
+ * @hide
+ */
+ public boolean isLayoutRtl() {
+ return ((mMarginFlags & LAYOUT_DIRECTION_MASK) == View.LAYOUT_DIRECTION_RTL);
+ }
+
+ @Override
+ public void onDebugDraw(View view, Canvas canvas, Paint paint) {
+ Insets oi = isLayoutModeOptical(view.mParent) ? view.getOpticalInsets() : Insets.NONE;
+
+ fillDifference(canvas,
+ view.getLeft() + oi.left,
+ view.getTop() + oi.top,
+ view.getRight() - oi.right,
+ view.getBottom() - oi.bottom,
+ leftMargin,
+ topMargin,
+ rightMargin,
+ bottomMargin,
+ paint);
+ }
+
+ /** @hide */
+ @Override
+ protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) {
+ super.encodeProperties(encoder);
+ encoder.addProperty("leftMargin", leftMargin);
+ encoder.addProperty("topMargin", topMargin);
+ encoder.addProperty("rightMargin", rightMargin);
+ encoder.addProperty("bottomMargin", bottomMargin);
+ encoder.addProperty("startMargin", startMargin);
+ encoder.addProperty("endMargin", endMargin);
+ }
+ }
+
+ /* 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[0];
+ 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(@NonNull View child, int pointerIdBits) {
+ if (child == null) {
+ throw new IllegalArgumentException("child must be non-null");
+ }
+
+ 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() {
+ if (child == null) {
+ throw new IllegalStateException("already recycled once");
+ }
+
+ 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[0];
+ 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(@NonNull View child) {
+ if (child == null) {
+ throw new IllegalArgumentException("child must be non-null");
+ }
+
+ 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() {
+ if (child == null) {
+ throw new IllegalStateException("already recycled once");
+ }
+
+ synchronized (sRecycleLock) {
+ if (sRecycledCount < MAX_RECYCLED) {
+ next = sRecycleBin;
+ sRecycleBin = this;
+ sRecycledCount += 1;
+ } else {
+ next = null;
+ }
+ child = null;
+ }
+ }
+ }
+
+ /**
+ * Pooled class that to hold the children for autifill.
+ */
+ static class ChildListForAutoFill extends ArrayList<View> {
+ private static final int MAX_POOL_SIZE = 32;
+
+ private static final Pools.SimplePool<ChildListForAutoFill> sPool =
+ new Pools.SimplePool<>(MAX_POOL_SIZE);
+
+ public static ChildListForAutoFill obtain() {
+ ChildListForAutoFill list = sPool.acquire();
+ if (list == null) {
+ list = new ChildListForAutoFill();
+ }
+ return list;
+ }
+
+ public void recycle() {
+ clear();
+ sPool.release(this);
+ }
+ }
+
+ /**
+ * Pooled class that orderes the children of a ViewGroup from start
+ * to end based on how they are laid out and the layout direction.
+ */
+ static class ChildListForAccessibility {
+
+ private static final int MAX_POOL_SIZE = 32;
+
+ private static final SynchronizedPool<ChildListForAccessibility> sPool =
+ new SynchronizedPool<ChildListForAccessibility>(MAX_POOL_SIZE);
+
+ private final ArrayList<View> mChildren = new ArrayList<View>();
+
+ private final ArrayList<ViewLocationHolder> mHolders = new ArrayList<ViewLocationHolder>();
+
+ public static ChildListForAccessibility obtain(ViewGroup parent, boolean sort) {
+ ChildListForAccessibility list = sPool.acquire();
+ if (list == null) {
+ list = new ChildListForAccessibility();
+ }
+ list.init(parent, sort);
+ return list;
+ }
+
+ public void recycle() {
+ clear();
+ sPool.release(this);
+ }
+
+ public int getChildCount() {
+ return mChildren.size();
+ }
+
+ public View getChildAt(int index) {
+ return mChildren.get(index);
+ }
+
+ private void init(ViewGroup parent, boolean sort) {
+ ArrayList<View> children = mChildren;
+ final int childCount = parent.getChildCount();
+ for (int i = 0; i < childCount; i++) {
+ View child = parent.getChildAt(i);
+ children.add(child);
+ }
+ if (sort) {
+ ArrayList<ViewLocationHolder> holders = mHolders;
+ for (int i = 0; i < childCount; i++) {
+ View child = children.get(i);
+ ViewLocationHolder holder = ViewLocationHolder.obtain(parent, child);
+ holders.add(holder);
+ }
+ sort(holders);
+ for (int i = 0; i < childCount; i++) {
+ ViewLocationHolder holder = holders.get(i);
+ children.set(i, holder.mView);
+ holder.recycle();
+ }
+ holders.clear();
+ }
+ }
+
+ private void sort(ArrayList<ViewLocationHolder> holders) {
+ // This is gross but the least risky solution. The current comparison
+ // strategy breaks transitivity but produces very good results. Coming
+ // up with a new strategy requires time which we do not have, so ...
+ try {
+ ViewLocationHolder.setComparisonStrategy(
+ ViewLocationHolder.COMPARISON_STRATEGY_STRIPE);
+ Collections.sort(holders);
+ } catch (IllegalArgumentException iae) {
+ // Note that in practice this occurs extremely rarely in a couple
+ // of pathological cases.
+ ViewLocationHolder.setComparisonStrategy(
+ ViewLocationHolder.COMPARISON_STRATEGY_LOCATION);
+ Collections.sort(holders);
+ }
+ }
+
+ private void clear() {
+ mChildren.clear();
+ }
+ }
+
+ /**
+ * Pooled class that holds a View and its location with respect to
+ * a specified root. This enables sorting of views based on their
+ * coordinates without recomputing the position relative to the root
+ * on every comparison.
+ */
+ static class ViewLocationHolder implements Comparable<ViewLocationHolder> {
+
+ private static final int MAX_POOL_SIZE = 32;
+
+ private static final SynchronizedPool<ViewLocationHolder> sPool =
+ new SynchronizedPool<ViewLocationHolder>(MAX_POOL_SIZE);
+
+ public static final int COMPARISON_STRATEGY_STRIPE = 1;
+
+ public static final int COMPARISON_STRATEGY_LOCATION = 2;
+
+ private static int sComparisonStrategy = COMPARISON_STRATEGY_STRIPE;
+
+ private final Rect mLocation = new Rect();
+
+ public View mView;
+
+ private int mLayoutDirection;
+
+ public static ViewLocationHolder obtain(ViewGroup root, View view) {
+ ViewLocationHolder holder = sPool.acquire();
+ if (holder == null) {
+ holder = new ViewLocationHolder();
+ }
+ holder.init(root, view);
+ return holder;
+ }
+
+ public static void setComparisonStrategy(int strategy) {
+ sComparisonStrategy = strategy;
+ }
+
+ public void recycle() {
+ clear();
+ sPool.release(this);
+ }
+
+ @Override
+ public int compareTo(ViewLocationHolder another) {
+ // This instance is greater than an invalid argument.
+ if (another == null) {
+ return 1;
+ }
+
+ if (sComparisonStrategy == COMPARISON_STRATEGY_STRIPE) {
+ // First is above second.
+ if (mLocation.bottom - another.mLocation.top <= 0) {
+ return -1;
+ }
+ // First is below second.
+ if (mLocation.top - another.mLocation.bottom >= 0) {
+ return 1;
+ }
+ }
+
+ // We are ordering left-to-right, top-to-bottom.
+ if (mLayoutDirection == LAYOUT_DIRECTION_LTR) {
+ final int leftDifference = mLocation.left - another.mLocation.left;
+ if (leftDifference != 0) {
+ return leftDifference;
+ }
+ } else { // RTL
+ final int rightDifference = mLocation.right - another.mLocation.right;
+ if (rightDifference != 0) {
+ return -rightDifference;
+ }
+ }
+ // We are ordering left-to-right, top-to-bottom.
+ final int topDifference = mLocation.top - another.mLocation.top;
+ if (topDifference != 0) {
+ return topDifference;
+ }
+ // Break tie by height.
+ final int heightDiference = mLocation.height() - another.mLocation.height();
+ if (heightDiference != 0) {
+ return -heightDiference;
+ }
+ // Break tie by width.
+ final int widthDiference = mLocation.width() - another.mLocation.width();
+ if (widthDiference != 0) {
+ return -widthDiference;
+ }
+ // Just break the tie somehow. The accessibliity ids are unique
+ // and stable, hence this is deterministic tie breaking.
+ return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId();
+ }
+
+ private void init(ViewGroup root, View view) {
+ Rect viewLocation = mLocation;
+ view.getDrawingRect(viewLocation);
+ root.offsetDescendantRectToMyCoords(view, viewLocation);
+ mView = view;
+ mLayoutDirection = root.getLayoutDirection();
+ }
+
+ private void clear() {
+ mView = null;
+ mLocation.set(0, 0, 0, 0);
+ }
+ }
+
+ private static void drawRect(Canvas canvas, Paint paint, int x1, int y1, int x2, int y2) {
+ if (sDebugLines== null) {
+ // TODO: This won't work with multiple UI threads in a single process
+ sDebugLines = new float[16];
+ }
+
+ sDebugLines[0] = x1;
+ sDebugLines[1] = y1;
+ sDebugLines[2] = x2;
+ sDebugLines[3] = y1;
+
+ sDebugLines[4] = x2;
+ sDebugLines[5] = y1;
+ sDebugLines[6] = x2;
+ sDebugLines[7] = y2;
+
+ sDebugLines[8] = x2;
+ sDebugLines[9] = y2;
+ sDebugLines[10] = x1;
+ sDebugLines[11] = y2;
+
+ sDebugLines[12] = x1;
+ sDebugLines[13] = y2;
+ sDebugLines[14] = x1;
+ sDebugLines[15] = y1;
+
+ canvas.drawLines(sDebugLines, paint);
+ }
+
+ /** @hide */
+ @Override
+ protected void encodeProperties(@NonNull ViewHierarchyEncoder encoder) {
+ super.encodeProperties(encoder);
+
+ encoder.addProperty("focus:descendantFocusability", getDescendantFocusability());
+ encoder.addProperty("drawing:clipChildren", getClipChildren());
+ encoder.addProperty("drawing:clipToPadding", getClipToPadding());
+ encoder.addProperty("drawing:childrenDrawingOrderEnabled", isChildrenDrawingOrderEnabled());
+ encoder.addProperty("drawing:persistentDrawingCache", getPersistentDrawingCache());
+
+ int n = getChildCount();
+ encoder.addProperty("meta:__childCount__", (short)n);
+ for (int i = 0; i < n; i++) {
+ encoder.addPropertyKey("meta:__child__" + i);
+ getChildAt(i).encode(encoder);
+ }
+ }
+}
