Add MotionEvent.HOVER_ENTER and HOVER_EXIT. (a032cc00) · Commits · e / os / android_frameworks_base

api/current.xml

+59 −0

Original line number	Diff line number	Diff line
		@@ -218638,6 +218638,28 @@
		visibility="public"
		>
		</field>
		<field name="ACTION_HOVER_ENTER"
		type="int"
		transient="false"
		volatile="false"
		value="9"
		static="true"
		final="true"
		deprecated="not deprecated"
		visibility="public"
		>
		</field>
		<field name="ACTION_HOVER_EXIT"
		type="int"
		transient="false"
		volatile="false"
		value="10"
		static="true"
		final="true"
		deprecated="not deprecated"
		visibility="public"
		>
		</field>
		<field name="ACTION_HOVER_MOVE"
		type="int"
		transient="false"
		@@ -223461,6 +223483,17 @@
		visibility="public"
		>
		</method>
		<method name="isHovered"
		return="boolean"
		abstract="false"
		native="false"
		synchronized="false"
		static="false"
		final="false"
		deprecated="not deprecated"
		visibility="public"
		>
		</method>
		<method name="isInEditMode"
		return="boolean"
		abstract="false"
		@@ -223936,6 +223969,19 @@
		<parameter name="event" type="android.view.MotionEvent">
		</parameter>
		</method>
		<method name="onHoverEvent"
		return="boolean"
		abstract="false"
		native="false"
		synchronized="false"
		static="false"
		final="false"
		deprecated="not deprecated"
		visibility="public"
		>
		<parameter name="event" type="android.view.MotionEvent">
		</parameter>
		</method>
		<method name="onKeyDown"
		return="boolean"
		abstract="false"
		@@ -224976,6 +225022,19 @@
		<parameter name="horizontalScrollBarEnabled" type="boolean">
		</parameter>
		</method>
		<method name="setHovered"
		return="void"
		abstract="false"
		native="false"
		synchronized="false"
		static="false"
		final="false"
		deprecated="not deprecated"
		visibility="public"
		>
		<parameter name="hovered" type="boolean">
		</parameter>
		</method>
		<method name="setId"
		return="void"
		abstract="false"

core/java/android/view/MotionEvent.java

+38 −5

Original line number	Diff line number	Diff line
		@@ -172,6 +172,8 @@ public final class MotionEvent extends InputEvent implements Parcelable {
		* recent point, as well as any intermediate points since the last
		* hover move event.
		* <p>
		* This action is always delivered to the window or view under the pointer.
		* </p><p>
		* This action is not a touch event so it is delivered to
		* {@link View#onGenericMotionEvent(MotionEvent)} rather than
		* {@link View#onTouchEvent(MotionEvent)}.
		@@ -184,8 +186,9 @@ public final class MotionEvent extends InputEvent implements Parcelable {
		* vertical and/or horizontal scroll offsets. Use {@link #getAxisValue(int)}
		* to retrieve the information from {@link #AXIS_VSCROLL} and {@link #AXIS_HSCROLL}.
		* The pointer may or may not be down when this event is dispatched.
		* This action is always delivered to the winder under the pointer, which
		* may not be the window currently touched.
		* <p></p>
		* This action is always delivered to the window or view under the pointer, which
		* may not be the window or view currently touched.
		* <p>
		* This action is not a touch event so it is delivered to
		* {@link View#onGenericMotionEvent(MotionEvent)} rather than
		@@ -194,6 +197,32 @@ public final class MotionEvent extends InputEvent implements Parcelable {
		*/
		public static final int ACTION_SCROLL = 8;

		/**
		* Constant for {@link #getAction}: The pointer is not down but has entered the
		* boundaries of a window or view.
		* <p>
		* This action is always delivered to the window or view under the pointer.
		* </p><p>
		* This action is not a touch event so it is delivered to
		* {@link View#onGenericMotionEvent(MotionEvent)} rather than
		* {@link View#onTouchEvent(MotionEvent)}.
		* </p>
		*/
		public static final int ACTION_HOVER_ENTER = 9;

		/**
		* Constant for {@link #getAction}: The pointer is not down but has exited the
		* boundaries of a window or view.
		* <p>
		* This action is always delivered to the window or view that was previously under the pointer.
		* </p><p>
		* This action is not a touch event so it is delivered to
		* {@link View#onGenericMotionEvent(MotionEvent)} rather than
		* {@link View#onTouchEvent(MotionEvent)}.
		* </p>
		*/
		public static final int ACTION_HOVER_EXIT = 10;

		/**
		* Bits in the action code that represent a pointer index, used with
		* {@link #ACTION_POINTER_DOWN} and {@link #ACTION_POINTER_UP}. Shifting
		@@ -1354,9 +1383,9 @@ public final class MotionEvent extends InputEvent implements Parcelable {
		/**
		* Returns true if this motion event is a touch event.
		* <p>
		* Specifically excludes pointer events with action {@link #ACTION_HOVER_MOVE}
		* or {@link #ACTION_SCROLL} because they are not actually touch events
		* (the pointer is not down).
		* Specifically excludes pointer events with action {@link #ACTION_HOVER_MOVE},
		* {@link #ACTION_HOVER_ENTER}, {@link #ACTION_HOVER_EXIT}, or {@link #ACTION_SCROLL}
		* because they are not actually touch events (the pointer is not down).
		* </p>
		* @return True if this motion event is a touch event.
		* @hide
		@@ -2313,6 +2342,10 @@ public final class MotionEvent extends InputEvent implements Parcelable {
		return "ACTION_HOVER_MOVE";
		case ACTION_SCROLL:
		return "ACTION_SCROLL";
		case ACTION_HOVER_ENTER:
		return "ACTION_HOVER_ENTER";
		case ACTION_HOVER_EXIT:
		return "ACTION_HOVER_EXIT";
		}
		int index = (action & ACTION_POINTER_INDEX_MASK) >> ACTION_POINTER_INDEX_SHIFT;
		switch (action & ACTION_MASK) {

core/java/android/view/View.java

+147 −5

Original line number	Diff line number	Diff line
		@@ -1622,6 +1622,12 @@ public class View implements Drawable.Callback, KeyEvent.Callback, Accessibility
		*/
		private static final int AWAKEN_SCROLL_BARS_ON_ATTACH = 0x08000000;

		/**
		* Indicates that the view has received HOVER_ENTER. Cleared on HOVER_EXIT.
		* @hide
		*/
		private static final int HOVERED = 0x10000000;

		/**
		* Indicates that pivotX or pivotY were explicitly set and we should not assume the center
		* for transform operations
		@@ -4643,22 +4649,80 @@ public class View implements Drawable.Callback, KeyEvent.Callback, Accessibility
		* <p>
		* Generic motion events with source class {@link InputDevice#SOURCE_CLASS_POINTER}
		* are delivered to the view under the pointer. All other generic motion events are
		* delivered to the focused view.
		* delivered to the focused view. Hover events are handled specially and are delivered
		* to {@link #onHoverEvent}.
		* </p>
		*
		* @param event The motion event to be dispatched.
		* @return True if the event was handled by the view, false otherwise.
		*/
		public boolean dispatchGenericMotionEvent(MotionEvent event) {
		final int source = event.getSource();
		if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) {
		final int action = event.getAction();
		if (action == MotionEvent.ACTION_HOVER_ENTER
		\|\| action == MotionEvent.ACTION_HOVER_MOVE
		\|\| action == MotionEvent.ACTION_HOVER_EXIT) {
		if (dispatchHoverEvent(event)) {
		return true;
		}
		} else if (dispatchGenericPointerEvent(event)) {
		return true;
		}
		} else if (dispatchGenericFocusedEvent(event)) {
		return true;
		}

		//noinspection SimplifiableIfStatement
		if (mOnGenericMotionListener != null && (mViewFlags & ENABLED_MASK) == ENABLED
		&& mOnGenericMotionListener.onGenericMotion(this, event)) {
		return true;
		}

		return onGenericMotionEvent(event);
		}

		/**
		* Dispatch a hover event.
		* <p>
		* Do not call this method directly. Call {@link #dispatchGenericMotionEvent} instead.
		* </p>
		*
		* @param event The motion event to be dispatched.
		* @return True if the event was handled by the view, false otherwise.
		* @hide
		*/
		protected boolean dispatchHoverEvent(MotionEvent event) {
		return onHoverEvent(event);
		}

		/**
		* Dispatch a generic motion event to the view under the first pointer.
		* <p>
		* Do not call this method directly. Call {@link #dispatchGenericMotionEvent} instead.
		* </p>
		*
		* @param event The motion event to be dispatched.
		* @return True if the event was handled by the view, false otherwise.
		* @hide
		*/
		protected boolean dispatchGenericPointerEvent(MotionEvent event) {
		return false;
		}

		/**
		* Dispatch a generic motion event to the currently focused view.
		* <p>
		* Do not call this method directly. Call {@link #dispatchGenericMotionEvent} instead.
		* </p>
		*
		* @param event The motion event to be dispatched.
		* @return True if the event was handled by the view, false otherwise.
		* @hide
		*/
		protected boolean dispatchGenericFocusedEvent(MotionEvent event) {
		return false;
		}

		/**
		* Dispatch a pointer event.
		* <p>
		@@ -5223,14 +5287,91 @@ public class View implements Drawable.Callback, KeyEvent.Callback, Accessibility
		* </code>
		*
		* @param event The generic motion event being processed.
		*
		* @return Return true if you have consumed the event, false if you haven't.
		* The default implementation always returns false.
		* @return True if the event was handled, false otherwise.
		*/
		public boolean onGenericMotionEvent(MotionEvent event) {
		return false;
		}

		/**
		* Implement this method to handle hover events.
		* <p>
		* Hover events are pointer events with action {@link MotionEvent#ACTION_HOVER_ENTER},
		* {@link MotionEvent#ACTION_HOVER_MOVE}, or {@link MotionEvent#ACTION_HOVER_EXIT}.
		* </p><p>
		* The view receives hover enter as the pointer enters the bounds of the view and hover
		* exit as the pointer exits the bound of the view or just before the pointer goes down
		* (which implies that {@link #onTouchEvent} will be called soon).
		* </p><p>
		* If the view would like to handle the hover event itself and prevent its children
		* from receiving hover, it should return true from this method. If this method returns
		* true and a child has already received a hover enter event, the child will
		* automatically receive a hover exit event.
		* </p><p>
		* The default implementation sets the hovered state of the view if the view is
		* clickable.
		* </p>
		*
		* @param event The motion event that describes the hover.
		* @return True if this view handled the hover event and does not want its children
		* to receive the hover event.
		*/
		public boolean onHoverEvent(MotionEvent event) {
		final int viewFlags = mViewFlags;

		if (((viewFlags & CLICKABLE) != CLICKABLE &&
		(viewFlags & LONG_CLICKABLE) != LONG_CLICKABLE)) {
		// Nothing to do if the view is not clickable.
		return false;
		}

		if ((viewFlags & ENABLED_MASK) == DISABLED) {
		// A disabled view that is clickable still consumes the hover events, it just doesn't
		// respond to them.
		return true;
		}

		switch (event.getAction()) {
		case MotionEvent.ACTION_HOVER_ENTER:
		setHovered(true);
		break;

		case MotionEvent.ACTION_HOVER_EXIT:
		setHovered(false);
		break;
		}

		return true;
		}

		/**
		* Returns true if the view is currently hovered.
		*
		* @return True if the view is currently hovered.
		*/
		public boolean isHovered() {
		return (mPrivateFlags & HOVERED) != 0;
		}

		/**
		* Sets whether the view is currently hovered.
		*
		* @param hovered True if the view is hovered.
		*/
		public void setHovered(boolean hovered) {
		if (hovered) {
		if ((mPrivateFlags & HOVERED) == 0) {
		mPrivateFlags \|= HOVERED;
		refreshDrawableState();
		}
		} else {
		if ((mPrivateFlags & HOVERED) != 0) {
		mPrivateFlags &= ~HOVERED;
		refreshDrawableState();
		}
		}
		}

		/**
		* Implement this method to handle touch screen motion events.
		*
		@@ -9877,6 +10018,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback, Accessibility
		// windows to better match their app.
		viewStateIndex \|= VIEW_STATE_ACCELERATED;
		}
		if ((privateFlags & HOVERED) != 0) viewStateIndex \|= VIEW_STATE_PRESSED; // temporary

		drawableState = VIEW_STATE_SETS[viewStateIndex];

core/java/android/view/ViewGroup.java

+169 −43

Original line number	Diff line number	Diff line
		@@ -147,6 +147,9 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		@ViewDebug.ExportedProperty(category = "events")
		private float mLastTouchDownY;

		// Child which last received ACTION_HOVER_ENTER and ACTION_HOVER_MOVE.
		private View mHoveredChild;

		/**
		* Internal flags.
		*
		@@ -1140,13 +1143,50 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		return false;
		}

		/**
		* {@inheritDoc}
		*/
		/** @hide */
		@Override
		public boolean dispatchGenericMotionEvent(MotionEvent event) {
		if ((event.getSource() & InputDevice.SOURCE_CLASS_POINTER) != 0) {
		// Send the event to the child under the pointer.
		protected boolean dispatchHoverEvent(MotionEvent event) {
		// Send the hover enter or hover move event to the view group first.
		// If it handles the event then a hovered child should receive hover exit.
		boolean handled = false;
		final boolean interceptHover;
		final int action = event.getAction();
		if (action == MotionEvent.ACTION_HOVER_EXIT) {
		interceptHover = true;
		} else {
		handled = super.dispatchHoverEvent(event);
		interceptHover = handled;
		}

		// Send successive hover events to the hovered child as long as the pointer
		// remains within the child's bounds.
		MotionEvent eventNoHistory = event;
		if (mHoveredChild != null) {
		final float x = event.getX();
		final float y = event.getY();

		if (interceptHover
		\|\| !isTransformedTouchPointInView(x, y, mHoveredChild, null)) {
		// Pointer exited the child.
		// Send it a hover exit with only the most recent coordinates. We could
		// try to find the exact point in history when the pointer left the view
		// but it is not worth the effort.
		eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory);
		eventNoHistory.setAction(MotionEvent.ACTION_HOVER_EXIT);
		handled \|= dispatchTransformedGenericPointerEvent(eventNoHistory, mHoveredChild);
		eventNoHistory.setAction(action);

		mHoveredChild = null;
		} else if (action == MotionEvent.ACTION_HOVER_MOVE) {
		// Pointer is still within the child.
		handled \|= dispatchTransformedGenericPointerEvent(event, mHoveredChild);
		}
		}

		// Find a new hovered child if needed.
		if (!interceptHover && mHoveredChild == null
		&& (action == MotionEvent.ACTION_HOVER_ENTER
		\|\| action == MotionEvent.ACTION_HOVER_MOVE)) {
		final int childrenCount = mChildrenCount;
		if (childrenCount != 0) {
		final View[] children = mChildren;
		@@ -1155,51 +1195,121 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager

		for (int i = childrenCount - 1; i >= 0; i--) {
		final View child = children[i];
		if ((child.mViewFlags & VISIBILITY_MASK) != VISIBLE
		&& child.getAnimation() == null) {
		// Skip invisible child unless it is animating.
		if (!canViewReceivePointerEvents(child)
		\|\| !isTransformedTouchPointInView(x, y, child, null)) {
		continue;
		}

		if (!isTransformedTouchPointInView(x, y, child, null)) {
		// Scroll point is out of child's bounds.
		continue;
		// Found the hovered child.
		mHoveredChild = child;
		if (action == MotionEvent.ACTION_HOVER_MOVE) {
		// Pointer was moving within the view group and entered the child.
		// Send it a hover enter and hover move with only the most recent
		// coordinates. We could try to find the exact point in history when
		// the pointer entered the view but it is not worth the effort.
		eventNoHistory = obtainMotionEventNoHistoryOrSelf(eventNoHistory);
		eventNoHistory.setAction(MotionEvent.ACTION_HOVER_ENTER);
		handled \|= dispatchTransformedGenericPointerEvent(eventNoHistory, child);
		eventNoHistory.setAction(action);

		handled \|= dispatchTransformedGenericPointerEvent(eventNoHistory, child);
		} else { /* must be ACTION_HOVER_ENTER */
		// Pointer entered the child.
		handled \|= dispatchTransformedGenericPointerEvent(event, child);
		}
		break;
		}
		}
		}

		final float offsetX = mScrollX - child.mLeft;
		final float offsetY = mScrollY - child.mTop;
		final boolean handled;
		if (!child.hasIdentityMatrix()) {
		MotionEvent transformedEvent = MotionEvent.obtain(event);
		transformedEvent.offsetLocation(offsetX, offsetY);
		transformedEvent.transform(child.getInverseMatrix());
		handled = child.dispatchGenericMotionEvent(transformedEvent);
		transformedEvent.recycle();
		} else {
		event.offsetLocation(offsetX, offsetY);
		handled = child.dispatchGenericMotionEvent(event);
		event.offsetLocation(-offsetX, -offsetY);
		// Recycle the copy of the event that we made.
		if (eventNoHistory != event) {
		eventNoHistory.recycle();
		}

		if (handled) {
		// Send hover exit to the view group. If there was a child, we will already have
		// sent the hover exit to it.
		if (action == MotionEvent.ACTION_HOVER_EXIT) {
		handled \|= super.dispatchHoverEvent(event);
		}

		// Done.
		return handled;
		}

		private static MotionEvent obtainMotionEventNoHistoryOrSelf(MotionEvent event) {
		if (event.getHistorySize() == 0) {
		return event;
		}
		return MotionEvent.obtainNoHistory(event);
		}

		/** @hide */
		@Override
		protected boolean dispatchGenericPointerEvent(MotionEvent event) {
		// Send the event to the child under the pointer.
		final int childrenCount = mChildrenCount;
		if (childrenCount != 0) {
		final View[] children = mChildren;
		final float x = event.getX();
		final float y = event.getY();

		for (int i = childrenCount - 1; i >= 0; i--) {
		final View child = children[i];
		if (!canViewReceivePointerEvents(child)
		\|\| !isTransformedTouchPointInView(x, y, child, null)) {
		continue;
		}

		if (dispatchTransformedGenericPointerEvent(event, child)) {
		return true;
		}
		}
		}

		// No child handled the event. Send it to this view group.
		return super.dispatchGenericMotionEvent(event);
		return super.dispatchGenericPointerEvent(event);
		}

		/** @hide */
		@Override
		protected boolean dispatchGenericFocusedEvent(MotionEvent event) {
		// Send the event to the focused child or to this view group if it has focus.
		if ((mPrivateFlags & (FOCUSED \| HAS_BOUNDS)) == (FOCUSED \| HAS_BOUNDS)) {
		return super.dispatchGenericMotionEvent(event);
		return super.dispatchGenericFocusedEvent(event);
		} else if (mFocused != null && (mFocused.mPrivateFlags & HAS_BOUNDS) == HAS_BOUNDS) {
		return mFocused.dispatchGenericMotionEvent(event);
		}
		return false;
		}

		/**
		* Dispatches a generic pointer event to a child, taking into account
		* transformations that apply to the child.
		*
		* @param event The event to send.
		* @param child The view to send the event to.
		* @return {@code true} if the child handled the event.
		*/
		private boolean dispatchTransformedGenericPointerEvent(MotionEvent event, View child) {
		final float offsetX = mScrollX - child.mLeft;
		final float offsetY = mScrollY - child.mTop;

		boolean handled;
		if (!child.hasIdentityMatrix()) {
		MotionEvent transformedEvent = MotionEvent.obtain(event);
		transformedEvent.offsetLocation(offsetX, offsetY);
		transformedEvent.transform(child.getInverseMatrix());
		handled = child.dispatchGenericMotionEvent(transformedEvent);
		transformedEvent.recycle();
		} else {
		event.offsetLocation(offsetX, offsetY);
		handled = child.dispatchGenericMotionEvent(event);
		event.offsetLocation(-offsetX, -offsetY);
		}
		return handled;
		}

		/**
		* {@inheritDoc}
		*/
		@@ -1213,8 +1323,7 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		final int actionMasked = action & MotionEvent.ACTION_MASK;

		// Handle an initial down.
		if (actionMasked == MotionEvent.ACTION_DOWN
		\|\| actionMasked == MotionEvent.ACTION_HOVER_MOVE) {
		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.
		@@ -1268,14 +1377,8 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager

		for (int i = childrenCount - 1; i >= 0; i--) {
		final View child = children[i];
		if ((child.mViewFlags & VISIBILITY_MASK) != VISIBLE
		&& child.getAnimation() == null) {
		// Skip invisible child unless it is animating.
		continue;
		}

		if (!isTransformedTouchPointInView(x, y, child, null)) {
		// New pointer is out of child's bounds.
		if (!canViewReceivePointerEvents(child)
		\|\| !isTransformedTouchPointInView(x, y, child, null)) {
		continue;
		}

		@@ -1475,6 +1578,15 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		}
		}

		/**
		* Returns true if a child view can receive pointer events.
		* @hide
		*/
		private static boolean canViewReceivePointerEvents(View child) {
		return (child.mViewFlags & VISIBILITY_MASK) == VISIBLE
		\|\| child.getAnimation() != null;
		}

		/**
		* Returns true if a child view contains the specified point when transformed
		* into its coordinate space.
		@@ -3244,6 +3356,10 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		mTransition.removeChild(this, view);
		}

		if (view == mHoveredChild) {
		mHoveredChild = null;
		}

		boolean clearChildFocus = false;
		if (view == mFocused) {
		view.clearFocusForRemoval();
		@@ -3307,6 +3423,7 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		final OnHierarchyChangeListener onHierarchyChangeListener = mOnHierarchyChangeListener;
		final boolean notifyListener = onHierarchyChangeListener != null;
		final View focused = mFocused;
		final View hoveredChild = mHoveredChild;
		final boolean detach = mAttachInfo != null;
		View clearChildFocus = null;

		@@ -3320,6 +3437,10 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		mTransition.removeChild(this, view);
		}

		if (view == hoveredChild) {
		mHoveredChild = null;
		}

		if (view == focused) {
		view.clearFocusForRemoval();
		clearChildFocus = view;
		@@ -3377,6 +3498,7 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		final OnHierarchyChangeListener listener = mOnHierarchyChangeListener;
		final boolean notify = listener != null;
		final View focused = mFocused;
		final View hoveredChild = mHoveredChild;
		final boolean detach = mAttachInfo != null;
		View clearChildFocus = null;

		@@ -3389,6 +3511,10 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		mTransition.removeChild(this, view);
		}

		if (view == hoveredChild) {
		mHoveredChild = null;
		}

		if (view == focused) {
		view.clearFocusForRemoval();
		clearChildFocus = view;

core/java/com/android/internal/widget/PointerLocationView.java

+6 −0

Original line number	Diff line number	Diff line
		@@ -357,6 +357,12 @@ public class PointerLocationView extends View {
		case MotionEvent.ACTION_HOVER_MOVE:
		prefix = "HOVER MOVE";
		break;
		case MotionEvent.ACTION_HOVER_ENTER:
		prefix = "HOVER ENTER";
		break;
		case MotionEvent.ACTION_HOVER_EXIT:
		prefix = "HOVER EXIT";
		break;
		case MotionEvent.ACTION_SCROLL:
		prefix = "SCROLL";
		break;