| /* |
| * 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.annotation.UnsupportedAppUsage; |
| 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.WindowInsetsAnimationListener.InsetsAnimation; |
| 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 android.view.autofill.Helper; |
| import android.view.inspector.InspectableProperty; |
| import android.view.inspector.InspectableProperty.EnumEntry; |
| |
| 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"; |
| |
| @UnsupportedAppUsage |
| 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} |
| */ |
| @UnsupportedAppUsage |
| 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} |
| */ |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 123768704) |
| protected OnHierarchyChangeListener mOnHierarchyChangeListener; |
| |
| // The view contained within this ViewGroup that has or contains focus. |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023) |
| 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. |
| @UnsupportedAppUsage |
| 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) |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 123769411) |
| 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 |
| */ |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 123769377) |
| 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} |
| */ |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 123769647) |
| 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} |
| */ |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 123983692) |
| 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} |
| */ |
| @UnsupportedAppUsage |
| protected int mPersistentDrawingCache; |
| |
| /** |
| * Used to indicate that no drawing cache should be kept in memory. |
| * |
| * @deprecated The view drawing cache was largely made obsolete with the introduction of |
| * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache |
| * layers are largely unnecessary and can easily result in a net loss in performance due to the |
| * cost of creating and updating the layer. In the rare cases where caching layers are useful, |
| * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware |
| * rendering. For software-rendered snapshots of a small part of the View hierarchy or |
| * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or |
| * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these |
| * software-rendered usages are discouraged and have compatibility issues with hardware-only |
| * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE} |
| * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback |
| * reports or unit testing the {@link PixelCopy} API is recommended. |
| */ |
| @Deprecated |
| public static final int PERSISTENT_NO_CACHE = 0x0; |
| |
| /** |
| * Used to indicate that the animation drawing cache should be kept in memory. |
| * |
| * @deprecated The view drawing cache was largely made obsolete with the introduction of |
| * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache |
| * layers are largely unnecessary and can easily result in a net loss in performance due to the |
| * cost of creating and updating the layer. In the rare cases where caching layers are useful, |
| * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware |
| * rendering. For software-rendered snapshots of a small part of the View hierarchy or |
| * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or |
| * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these |
| * software-rendered usages are discouraged and have compatibility issues with hardware-only |
| * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE} |
| * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback |
| * reports or unit testing the {@link PixelCopy} API is recommended. |
| */ |
| @Deprecated |
| public static final int PERSISTENT_ANIMATION_CACHE = 0x1; |
| |
| /** |
| * Used to indicate that the scrolling drawing cache should be kept in memory. |
| * |
| * @deprecated The view drawing cache was largely made obsolete with the introduction of |
| * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache |
| * layers are largely unnecessary and can easily result in a net loss in performance due to the |
| * cost of creating and updating the layer. In the rare cases where caching layers are useful, |
| * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware |
| * rendering. For software-rendered snapshots of a small part of the View hierarchy or |
| * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or |
| * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these |
| * software-rendered usages are discouraged and have compatibility issues with hardware-only |
| * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE} |
| * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback |
| * reports or unit testing the {@link PixelCopy} API is recommended. |
| */ |
| @Deprecated |
| public static final int PERSISTENT_SCROLLING_CACHE = 0x2; |
| |
| /** |
| * Used to indicate that all drawing caches should be kept in memory. |
| * |
| * @deprecated The view drawing cache was largely made obsolete with the introduction of |
| * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache |
| * layers are largely unnecessary and can easily result in a net loss in performance due to the |
| * cost of creating and updating the layer. In the rare cases where caching layers are useful, |
| * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware |
| * rendering. For software-rendered snapshots of a small part of the View hierarchy or |
| * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or |
| * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these |
| * software-rendered usages are discouraged and have compatibility issues with hardware-only |
| * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE} |
| * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback |
| * reports or unit testing the {@link PixelCopy} API is recommended. |
| */ |
| @Deprecated |
| 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 |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P) |
| private View[] mChildren; |
| // Number of valid children in the mChildren array, the rest should be null or not |
| // considered as children |
| @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P) |
| 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; |
| |
| /** |
| * Keeps track of how many child views have UnhandledKeyEventListeners. This should only be |
| * updated on the UI thread so shouldn't require explicit synchronization. |
| */ |
| int mChildUnhandledKeyListeners = 0; |
| |
| /** |
| * 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); |
| saveAttributeDataForStyleable(context, R.styleable.ViewGroup, attrs, a, 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") |
| }) |
| @InspectableProperty(enumMapping = { |
| @EnumEntry(value = FOCUS_BEFORE_DESCENDANTS, name = "beforeDescendants"), |
| @EnumEntry(value = FOCUS_AFTER_DESCENDANTS, name = "afterDescendants"), |
| @EnumEntry(value = FOCUS_BLOCK_DESCENDANTS, name = "blocksDescendants") |
| }) |
| 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") |
| @InspectableProperty |
| 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 |
| @UnsupportedAppUsage |
| 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 |
| */ |
| @UnsupportedAppUsage |
| 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 (!child.canReceivePointerEvents() |
| || !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 (!child.canReceivePointerEvents() |
| || !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 (!child.canReceivePointerEvents() |
| || !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; |
| } |
| |
| /** @hide */ |
| @Override |
| protected boolean pointInHoveredChild(MotionEvent event) { |
| if (mFirstHoverTarget != null) { |
| return isTransformedTouchPointInView(event.getX(), event.getY(), |
| mFirstHoverTarget.child, null); |
| } |
| return false; |
| } |
| |
| @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 (!child.canReceivePointerEvents() |
| || !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 accessibility 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 (!child.canReceivePointerEvents() |
| || !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; |
| } |
| } |
| |
| @UnsupportedAppUsage |
| 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; |
| } |
| } |
| |
| 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 |
| */ |
| @UnsupportedAppUsage |
| 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 |
| */ |
| @UnsupportedAppUsage |
| 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. |
| */ |
| @InspectableProperty(name = "splitMotionEvents") |
| 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. |
| */ |
| @InspectableProperty |
| 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(); |
| |
| boolean result; |
| switch (descendantFocusability) { |
| case FOCUS_BLOCK_DESCENDANTS: |
| result = super.requestFocus(direction, previouslyFocusedRect); |
| break; |
| case FOCUS_BEFORE_DESCENDANTS: { |
| final boolean took = super.requestFocus(direction, previouslyFocusedRect); |
| result = took ? took : onRequestFocusInDescendants(direction, |
| previouslyFocusedRect); |
| break; |
| } |
| case FOCUS_AFTER_DESCENDANTS: { |
| final boolean took = onRequestFocusInDescendants(direction, previouslyFocusedRect); |
| result = took ? took : super.requestFocus(direction, previouslyFocusedRect); |
| break; |
| } |
| default: |
| throw new IllegalStateException("descendant focusability must be " |
| + "one of FOCUS_BEFORE_DESCENDANTS, FOCUS_AFTER_DESCENDANTS, FOCUS_BLOCK_DESCENDANTS " |
| + "but is " + descendantFocusability); |
| } |
| if (result && !isLayoutValid() && ((mPrivateFlags & PFLAG_WANTS_FOCUS) == 0)) { |
| mPrivateFlags |= PFLAG_WANTS_FOCUS; |
| } |
| return result; |
| } |
| |
| /** |
| * 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 |
| @UnsupportedAppUsage |
| 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()) { |
| if (Helper.sVerbose) { |
| 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()) { |
| if (Helper.sVerbose) { |
| Log.v(VIEW_LOG_TAG, "dispatchProvideAutofillStructure(): not laid out, ignoring " |
| + mChildrenCount + " children of " + getAutofillId()); |
| } |
| return; |
| } |
| |
| final ChildListForAutoFillOrContentCapture 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(); |
| } |
| |
| /** @hide */ |
| @Override |
| public void dispatchProvideContentCaptureStructure() { |
| super.dispatchProvideContentCaptureStructure(); |
| |
| if (!isLaidOut()) return; |
| |
| final ChildListForAutoFillOrContentCapture children = getChildrenForContentCapture(); |
| final int childrenCount = children.size(); |
| for (int i = 0; i < childrenCount; i++) { |
| final View child = children.get(i); |
| child.dispatchProvideContentCaptureStructure(); |
| } |
| 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 ChildListForAutoFillOrContentCapture getChildrenForAutofill( |
| @AutofillFlags int flags) { |
| final ChildListForAutoFillOrContentCapture children = ChildListForAutoFillOrContentCapture |
| .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 @NonNull ChildListForAutoFillOrContentCapture getChildrenForContentCapture() { |
| final ChildListForAutoFillOrContentCapture children = ChildListForAutoFillOrContentCapture |
| .obtain(); |
| populateChildrenForContentCapture(children); |
| return children; |
| } |
| |
| /** @hide */ |
| private void populateChildrenForContentCapture(ArrayList<View> list) { |
| 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 (child.isImportantForContentCapture()) { |
| list.add(child); |
| } else if (child instanceof ViewGroup) { |
| ((ViewGroup) child).populateChildrenForContentCapture(list); |
| } |
| } |
| } |
| |
| 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 |
| @UnsupportedAppUsage |
| 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 |
| @UnsupportedAppUsage |
| 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 |
| * |
| * @deprecated The view drawing cache was largely made obsolete with the introduction of |
| * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache |
| * layers are largely unnecessary and can easily result in a net loss in performance due to the |
| * cost of creating and updating the layer. In the rare cases where caching layers are useful, |
| * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware |
| * rendering. For software-rendered snapshots of a small part of the View hierarchy or |
| * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or |
| * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these |
| * software-rendered usages are discouraged and have compatibility issues with hardware-only |
| * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE} |
| * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback |
| * reports or unit testing the {@link PixelCopy} API is recommended. |
| */ |
| @Deprecated |
| 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(ViewDebug.CanvasProvider canvasProvider, 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); |
| } |
| } |
| } |
| |
| try { |
| return super.createSnapshot(canvasProvider, skipChildren); |
| } finally { |
| 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 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); |
| } |
| |
| /** |
| * @hide |
| */ |
| protected void onDebugDrawMargins(Canvas canvas, Paint paint) { |
| for (int i = 0; i < getChildCount(); i++) { |
| View c = getChildAt(i); |
| c.getLayoutParams().onDebugDraw(c, canvas, paint); |
| } |
| } |
| |
| /** |
| * @hide |
| */ |
| 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; |
| } |
| |
| /** |
| * Converts drawing order position to container position. Override this |
| * if you want to change the drawing order of children. By default, it |
| * returns drawingPosition. |
| * <p> |
| * NOTE: In order for this method to be called, you must enable child ordering |
| * first by calling {@link #setChildrenDrawingOrderEnabled(boolean)}. |
| * |
| * @param drawingPosition the drawing order position. |
| * @return the container position of a child for this drawing order position. |
| * |
| * @see #setChildrenDrawingOrderEnabled(boolean) |
| * @see #isChildrenDrawingOrderEnabled() |
| */ |
| protected int getChildDrawingOrder(int childCount, int drawingPosition) { |
| return drawingPosition; |
| } |
| |
| /** |
| * Converts drawing order position to container position. |
| * <p> |
| * Children are not necessarily drawn in the order in which they appear in the container. |
| * ViewGroups can enable a custom ordering via {@link #setChildrenDrawingOrderEnabled(boolean)}. |
| * This method returns the container position of a child that appears in the given position |
| * in the current drawing order. |
| * |
| * @param drawingPosition the drawing order position. |
| * @return the container position of a child for this drawing order position. |
| * |
| * @see #getChildDrawingOrder(int, int)} |
| */ |
| public final int getChildDrawingOrder(int drawingPosition) { |
| return getChildDrawingOrder(getChildCount(), drawingPosition); |
| } |
| |
| 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 |
| @UnsupportedAppUsage |
| 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); |
| } |
| } |
| final int transientCount = mTransientViews == null ? 0 : mTransientIndices.size(); |
| for (int i = 0; i < transientCount; ++i) { |
| View child = mTransientViews.get(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") |
| @InspectableProperty |
| 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") |
| @InspectableProperty |
| 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. The view must not have a parent. |
| * @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 |
| */ |
| @UnsupportedAppUsage |
| public void addTransientView(View view, int index) { |
| if (index < 0 || view == null) { |
| return; |
| } |
| if (view.mParent != null) { |
| throw new IllegalStateException("The specified view already has a parent " |
| + view.mParent); |
| } |
| |
| 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; |
| if (mAttachInfo != null) { |
| 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 |
| */ |
| @UnsupportedAppUsage |
| 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; |
| if (view.mAttachInfo != 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 |
| */ |
| @UnsupportedAppUsage |
| 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 |
| */ |
| @UnsupportedAppUsage |
| 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; |
| } |
| |
| @UnsupportedAppUsage |
| 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) { |
| } |
| |
| @UnsupportedAppUsage |
| 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; |
| } |
| if (child.hasUnhandledKeyListener()) { |
| incrementChildUnhandledKeyListeners(); |
| } |
| |
| 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); |
| } |
| |
| touchAccessibilityNodeProviderIfNeeded(child); |
| } |
| |
| /** |
| * We may need to touch the provider to bring up the a11y layer. In a11y mode |
| * clients inspect the screen or the user touches it which triggers bringing up |
| * of the a11y infrastructure while in autofill mode we want the infra up and |
| * running from the beginning since we watch for a11y events to drive autofill. |
| */ |
| private void touchAccessibilityNodeProviderIfNeeded(View child) { |
| if (mContext.isAutofillCompatibilityEnabled()) { |
| child.getAccessibilityNodeProvider(); |
| } |
| } |
| |
| 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.hasUnhandledKeyListener()) { |
| decrementChildUnhandledKeyListeners(); |
| } |
| |
| 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()); |
| notifySubtreeAccessibilityStateChangedIfNeeded(); |
| } |
| |
| /** |
| * 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(); |
| // Mark the child as dirty, using the appropriate flag |
| // Make sure we do not set both flags at the same time |
| |
| 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.mPrivateFlags & PFLAG_DIRTY_MASK) != PFLAG_DIRTY) { |
| view.mPrivateFlags = (view.mPrivateFlags & ~PFLAG_DIRTY_MASK) | PFLAG_DIRTY; |
| } |
| } |
| |
| 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 |
| */ |
| @UnsupportedAppUsage |
| 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 |
| */ |
| @InspectableProperty |
| 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 |
| @InspectableProperty(name = "animationCache") |
| 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 |
| @InspectableProperty(name = "alwaysDrawnWithCache") |
| 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} |
| * |
| * @deprecated The view drawing cache was largely made obsolete with the introduction of |
| * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache |
| * layers are largely unnecessary and can easily result in a net loss in performance due to the |
| * cost of creating and updating the layer. In the rare cases where caching layers are useful, |
| * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware |
| * rendering. For software-rendered snapshots of a small part of the View hierarchy or |
| * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or |
| * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these |
| * software-rendered usages are discouraged and have compatibility issues with hardware-only |
| * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE} |
| * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback |
| * reports or unit testing the {@link PixelCopy} API is recommended. |
| */ |
| @Deprecated |
| @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") |
| }) |
| @InspectableProperty(enumMapping = { |
| @EnumEntry(value = PERSISTENT_NO_CACHE, name = "none"), |
| @EnumEntry(value = PERSISTENT_ANIMATION_CACHE, name = "animation"), |
| @EnumEntry(value = PERSISTENT_SCROLLING_CACHE, name = "scrolling"), |
| @EnumEntry(value = PERSISTENT_ALL_CACHES, name = "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} |
| * |
| * @deprecated The view drawing cache was largely made obsolete with the introduction of |
| * hardware-accelerated rendering in API 11. With hardware-acceleration, intermediate cache |
| * layers are largely unnecessary and can easily result in a net loss in performance due to the |
| * cost of creating and updating the layer. In the rare cases where caching layers are useful, |
| * such as for alpha animations, {@link #setLayerType(int, Paint)} handles this with hardware |
| * rendering. For software-rendered snapshots of a small part of the View hierarchy or |
| * individual Views it is recommended to create a {@link Canvas} from either a {@link Bitmap} or |
| * {@link android.graphics.Picture} and call {@link #draw(Canvas)} on the View. However these |
| * software-rendered usages are discouraged and have compatibility issues with hardware-only |
| * rendering features such as {@link android.graphics.Bitmap.Config#HARDWARE Config.HARDWARE} |
| * bitmaps, real-time shadows, and outline clipping. For screenshots of the UI for feedback |
| * reports or unit testing the {@link PixelCopy} API is recommended. |
| */ |
| @Deprecated |
| 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) |
| */ |
| @InspectableProperty(enumMapping = { |
| @EnumEntry(value = LAYOUT_MODE_CLIP_BOUNDS, name = "clipBounds"), |
| @EnumEntry(value = LAYOUT_MODE_OPTICAL_BOUNDS, name = "opticalBounds") |
| }) |
| 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. |
| */ |
| 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. |
| */ |
| 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); |
| } |
| } |
| } |
| |
| /** |
| * @hide |
| */ |
| @Override |
| public void subtractObscuredTouchableRegion(Region touchableRegion, View view) { |
| final int childrenCount = mChildrenCount; |
| 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 (child == view) { |
| // We've reached the target view. |
| break; |
| } |
| if (!child.canReceivePointerEvents()) { |
| // This child cannot be touched. Skip it. |
| continue; |
| } |
| applyOpToRegionByBounds(touchableRegion, child, Region.Op.DIFFERENCE); |
| } |
| |
| // The touchable region should not exceed the bounds of its container. |
| applyOpToRegionByBounds(touchableRegion, this, Region.Op.INTERSECT); |
| |
| final ViewParent parent = getParent(); |
| if (parent != null) { |
| parent.subtractObscuredTouchableRegion(touchableRegion, this); |
| } |
| } |
| |
| private static void applyOpToRegionByBounds(Region region, View view, Region.Op op) { |
| final int[] locationInWindow = new int[2]; |
| view.getLocationInWindow(locationInWindow); |
| final int x = locationInWindow[0]; |
| final int y = locationInWindow[1]; |
| region.op(x, y, x + view.getWidth(), y + view.getHeight(), op); |
| } |
| |
| @Override |
| public WindowInsets dispatchApplyWindowInsets(WindowInsets insets) { |
| insets = super.dispatchApplyWindowInsets(insets); |
| if (View.sBrokenInsetsDispatch) { |
| return brokenDispatchApplyWindowInsets(insets); |
| } else { |
| return newDispatchApplyWindowInsets(insets); |
| } |
| } |
| |
| private WindowInsets brokenDispatchApplyWindowInsets(WindowInsets 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; |
| } |
| |
| private WindowInsets newDispatchApplyWindowInsets(WindowInsets insets) { |
| final int count = getChildCount(); |
| for (int i = 0; i < count; i++) { |
| getChildAt(i).dispatchApplyWindowInsets(insets); |
| } |
| return insets; |
| } |
| |
| @Override |
| void dispatchWindowInsetsAnimationStarted(InsetsAnimation animation) { |
| super.dispatchWindowInsetsAnimationStarted(animation); |
| final int count = getChildCount(); |
| for (int i = 0; i < count; i++) { |
| getChildAt(i).dispatchWindowInsetsAnimationStarted(animation); |
| } |
| } |
| |
| @Override |
| WindowInsets dispatchWindowInsetsAnimationProgress(WindowInsets insets) { |
| insets = super.dispatchWindowInsetsAnimationProgress(insets); |
| final int count = getChildCount(); |
| for (int i = 0; i < count; i++) { |
| getChildAt(i).dispatchWindowInsetsAnimationProgress(insets); |
| } |
| return insets; |
| } |
| |
| @Override |
| void dispatchWindowInsetsAnimationFinished(InsetsAnimation animation) { |
| super.dispatchWindowInsetsAnimationFinished(animation); |
| final int count = getChildCount(); |
| for (int i = 0; i < count; i++) { |
| getChildAt(i).dispatchWindowInsetsAnimationFinished(animation); |
| } |
| } |
| |
| /** |
| * 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. |
| */ |
| @InspectableProperty |
| 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 |
| @UnsupportedAppUsage |
| 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 |
| */ |
| @TestApi |
| @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 |
| */ |
| @TestApi |
| @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 |
| */ |
| @TestApi |
| @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 |
| */ |
| @TestApi |
| @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 |
| */ |
| @TestApi |
| @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); |
| } |
| } |
| |
| @Override |
| boolean hasUnhandledKeyListener() { |
| return (mChildUnhandledKeyListeners > 0) || super.hasUnhandledKeyListener(); |
| } |
| |
| void incrementChildUnhandledKeyListeners() { |
| mChildUnhandledKeyListeners += 1; |
| if (mChildUnhandledKeyListeners == 1) { |
| if (mParent instanceof ViewGroup) { |
| ((ViewGroup) mParent).incrementChildUnhandledKeyListeners(); |
| } |
| } |
| } |
| |
| void decrementChildUnhandledKeyListeners() { |
| mChildUnhandledKeyListeners -= 1; |
| if (mChildUnhandledKeyListeners == 0) { |
| if (mParent instanceof ViewGroup) { |
| ((ViewGroup) mParent).decrementChildUnhandledKeyListeners(); |
| } |
| } |
| } |
| |
| @Override |
| View dispatchUnhandledKeyEvent(KeyEvent evt) { |
| if (!hasUnhandledKeyListener()) { |
| return null; |
| } |
| ArrayList<View> orderedViews = buildOrderedChildList(); |
| if (orderedViews != null) { |
| try { |
| for (int i = orderedViews.size() - 1; i >= 0; --i) { |
| View v = orderedViews.get(i); |
| View consumer = v.dispatchUnhandledKeyEvent(evt); |
| if (consumer != null) { |
| return consumer; |
| } |
| } |
| } finally { |
| orderedViews.clear(); |
| } |
| } else { |
| for (int i = getChildCount() - 1; i >= 0; --i) { |
| View v = getChildAt(i); |
| View consumer = v.dispatchUnhandledKeyEvent(evt); |
| if (consumer != null) { |
| return consumer; |
| } |
| } |
| } |
| if (onUnhandledKeyEvent(evt)) { |
| return this; |
| } |
| return null; |
| } |
| |
| /** |
| * 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") |
| }) |
| @InspectableProperty(name = "layout_width", enumMapping = { |
| @EnumEntry(name = "match_parent", value = MATCH_PARENT), |
| @EnumEntry(name = "wrap_content", value = 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") |
| }) |
| @InspectableProperty(name = "layout_height", enumMapping = { |
| @EnumEntry(name = "match_parent", value = MATCH_PARENT), |
| @EnumEntry(name = "wrap_content", value = 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 |
| */ |
| @UnsupportedAppUsage |
| 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. |
| * |
| * @param view the view that contains these layout parameters |
| * @param canvas the canvas on which to draw |
| * |
| * @hide |
| */ |
| 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") |
| @InspectableProperty(name = "layout_marginLeft") |
| 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") |
| @InspectableProperty(name = "layout_marginTop") |
| 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") |
| @InspectableProperty(name = "layout_marginRight") |
| 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") |
| @InspectableProperty(name = "layout_marginBottom") |
| 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") |
| @UnsupportedAppUsage |
| 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") |
| @UnsupportedAppUsage |
| 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 |
| * overridden 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 overridden 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 |
| */ |
| @UnsupportedAppUsage |
| 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); |
| } |
| |
| /** |
| * @hide |
| */ |
| @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. |
| @UnsupportedAppUsage |
| 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; |
| |
| @UnsupportedAppUsage |
| 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. |
| */ |
| private static class ChildListForAutoFillOrContentCapture extends ArrayList<View> { |
| private static final int MAX_POOL_SIZE = 32; |
| |
| private static final Pools.SimplePool<ChildListForAutoFillOrContentCapture> sPool = |
| new Pools.SimplePool<>(MAX_POOL_SIZE); |
| |
| public static ChildListForAutoFillOrContentCapture obtain() { |
| ChildListForAutoFillOrContentCapture list = sPool.acquire(); |
| if (list == null) { |
| list = new ChildListForAutoFillOrContentCapture(); |
| } |
| 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(); |
| |
| private ViewGroup mRoot; |
| |
| 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; |
| } |
| |
| int boundsResult = compareBoundsOfTree(this, another); |
| if (boundsResult != 0) { |
| return boundsResult; |
| } |
| |
| // Just break the tie somehow. The accessibility ids are unique |
| // and stable, hence this is deterministic tie breaking. |
| return mView.getAccessibilityViewId() - another.mView.getAccessibilityViewId(); |
| } |
| |
| /** |
| * Compare two views based on their bounds. Use the bounds of their children to break ties. |
| * |
| * @param holder1 Holder of first view to compare |
| * @param holder2 Holder of second view to compare. Must have the same root as holder1. |
| * @return The compare result, with equality if no good comparison was found. |
| */ |
| private static int compareBoundsOfTree( |
| ViewLocationHolder holder1, ViewLocationHolder holder2) { |
| if (sComparisonStrategy == COMPARISON_STRATEGY_STRIPE) { |
| // First is above second. |
| if (holder1.mLocation.bottom - holder2.mLocation.top <= 0) { |
| return -1; |
| } |
| // First is below second. |
| if (holder1.mLocation.top - holder2.mLocation.bottom >= 0) { |
| return 1; |
| } |
| } |
| |
| // We are ordering left-to-right, top-to-bottom. |
| if (holder1.mLayoutDirection == LAYOUT_DIRECTION_LTR) { |
| final int leftDifference = holder1.mLocation.left - holder2.mLocation.left; |
| if (leftDifference != 0) { |
| return leftDifference; |
| } |
| } else { // RTL |
| final int rightDifference = holder1.mLocation.right - holder2.mLocation.right; |
| if (rightDifference != 0) { |
| return -rightDifference; |
| } |
| } |
| // We are ordering left-to-right, top-to-bottom. |
| final int topDifference = holder1.mLocation.top - holder2.mLocation.top; |
| if (topDifference != 0) { |
| return topDifference; |
| } |
| // Break tie by height. |
| final int heightDiference = holder1.mLocation.height() - holder2.mLocation.height(); |
| if (heightDiference != 0) { |
| return -heightDiference; |
| } |
| // Break tie by width. |
| final int widthDifference = holder1.mLocation.width() - holder2.mLocation.width(); |
| if (widthDifference != 0) { |
| return -widthDifference; |
| } |
| |
| // Find a child of each view with different screen bounds. |
| final Rect view1Bounds = new Rect(); |
| final Rect view2Bounds = new Rect(); |
| final Rect tempRect = new Rect(); |
| holder1.mView.getBoundsOnScreen(view1Bounds, true); |
| holder2.mView.getBoundsOnScreen(view2Bounds, true); |
| final View child1 = holder1.mView.findViewByPredicateTraversal((view) -> { |
| view.getBoundsOnScreen(tempRect, true); |
| return !tempRect.equals(view1Bounds); |
| }, null); |
| final View child2 = holder2.mView.findViewByPredicateTraversal((view) -> { |
| view.getBoundsOnScreen(tempRect, true); |
| return !tempRect.equals(view2Bounds); |
| }, null); |
| |
| |
| // Compare the children recursively |
| if ((child1 != null) && (child2 != null)) { |
| final ViewLocationHolder childHolder1 = |
| ViewLocationHolder.obtain(holder1.mRoot, child1); |
| final ViewLocationHolder childHolder2 = |
| ViewLocationHolder.obtain(holder1.mRoot, child2); |
| return compareBoundsOfTree(childHolder1, childHolder2); |
| } |
| |
| // If only one has a child, use that one |
| if (child1 != null) { |
| return 1; |
| } |
| |
| if (child2 != null) { |
| return -1; |
| } |
| |
| // Give up |
| return 0; |
| } |
| |
| private void init(ViewGroup root, View view) { |
| Rect viewLocation = mLocation; |
| view.getDrawingRect(viewLocation); |
| root.offsetDescendantRectToMyCoords(view, viewLocation); |
| mView = view; |
| mRoot = root; |
| mLayoutDirection = root.getLayoutDirection(); |
| } |
| |
| private void clear() { |
| mView = null; |
| mRoot = 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 |
| @UnsupportedAppUsage |
| 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); |
| } |
| } |
| } |