Track motion events before we decide to start scrolling (13451a47) · Commits · e / os / android_frameworks_base

core/java/android/widget/AbsListView.java

+50 −14

Original line number	Diff line number	Diff line
		@@ -54,6 +54,7 @@ import android.view.View;
		import android.view.ViewConfiguration;
		import android.view.ViewDebug;
		import android.view.ViewGroup;
		import android.view.ViewParent;
		import android.view.ViewTreeObserver;
		import android.view.accessibility.AccessibilityEvent;
		import android.view.accessibility.AccessibilityNodeInfo;
		@@ -2788,7 +2789,10 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		reportScrollStateChange(OnScrollListener.SCROLL_STATE_TOUCH_SCROLL);
		// Time to start stealing events! Once we've stolen them, don't let anyone
		// steal from us
		requestDisallowInterceptTouchEvent(true);
		final ViewParent parent = getParent();
		if (parent != null) {
		parent.requestDisallowInterceptTouchEvent(true);
		}
		return true;
		}

		@@ -2848,9 +2852,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		View v;
		int deltaY;

		if (mVelocityTracker == null) {
		mVelocityTracker = VelocityTracker.obtain();
		}
		initVelocityTrackerIfNotExists();
		mVelocityTracker.addMovement(ev);

		switch (action & MotionEvent.ACTION_MASK) {
		@@ -2955,7 +2957,10 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		// Make sure that we do so in case we're in a parent that can intercept.
		if ((mGroupFlags & FLAG_DISALLOW_INTERCEPT) == 0 &&
		Math.abs(deltaY) > mTouchSlop) {
		requestDisallowInterceptTouchEvent(true);
		final ViewParent parent = getParent();
		if (parent != null) {
		parent.requestDisallowInterceptTouchEvent(true);
		}
		}

		final int rawDeltaY = deltaY;
		@@ -2998,8 +3003,10 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		0, mOverscrollDistance, true);
		if (Math.abs(mOverscrollDistance) == Math.abs(mScrollY)) {
		// Don't allow overfling if we're at the edge.
		if (mVelocityTracker != null) {
		mVelocityTracker.clear();
		}
		}

		final int overscrollMode = getOverScrollMode();
		if (overscrollMode == OVER_SCROLL_ALWAYS \|\|
		@@ -3259,10 +3266,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		handler.removeCallbacks(mPendingCheckForLongPress);
		}

		if (mVelocityTracker != null) {
		mVelocityTracker.recycle();
		mVelocityTracker = null;
		}
		recycleVelocityTracker();

		mActivePointerId = INVALID_POINTER;

		@@ -3307,10 +3311,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		handler.removeCallbacks(mPendingCheckForLongPress);
		}

		if (mVelocityTracker != null) {
		mVelocityTracker.recycle();
		mVelocityTracker = null;
		}
		recycleVelocityTracker();
		}

		if (mEdgeGlowTop != null) {
		@@ -3450,6 +3451,35 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		mGlowPaddingRight = rightPadding;
		}

		private void initOrResetVelocityTracker() {
		if (mVelocityTracker == null) {
		mVelocityTracker = VelocityTracker.obtain();
		} else {
		mVelocityTracker.clear();
		}
		}

		private void initVelocityTrackerIfNotExists() {
		if (mVelocityTracker == null) {
		mVelocityTracker = VelocityTracker.obtain();
		}
		}

		private void recycleVelocityTracker() {
		if (mVelocityTracker != null) {
		mVelocityTracker.recycle();
		mVelocityTracker = null;
		}
		}

		@Override
		public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
		if (disallowIntercept) {
		recycleVelocityTracker();
		}
		super.requestDisallowInterceptTouchEvent(disallowIntercept);
		}

		@Override
		public boolean onInterceptTouchEvent(MotionEvent ev) {
		int action = ev.getAction();
		@@ -3487,6 +3517,8 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		clearScrollingCache();
		}
		mLastY = Integer.MIN_VALUE;
		initOrResetVelocityTracker();
		mVelocityTracker.addMovement(ev);
		if (touchMode == TOUCH_MODE_FLING) {
		return true;
		}
		@@ -3502,6 +3534,8 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		mActivePointerId = ev.getPointerId(pointerIndex);
		}
		final int y = (int) ev.getY(pointerIndex);
		initVelocityTrackerIfNotExists();
		mVelocityTracker.addMovement(ev);
		if (startScrollIfNeeded(y - mMotionY)) {
		return true;
		}
		@@ -3510,9 +3544,11 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te
		break;
		}

		case MotionEvent.ACTION_CANCEL:
		case MotionEvent.ACTION_UP: {
		mTouchMode = TOUCH_MODE_REST;
		mActivePointerId = INVALID_POINTER;
		recycleVelocityTracker();
		reportScrollStateChange(OnScrollListener.SCROLL_STATE_IDLE);
		break;
		}

core/java/android/widget/HorizontalScrollView.java

+39 −11

Original line number	Diff line number	Diff line
		@@ -399,6 +399,35 @@ public class HorizontalScrollView extends FrameLayout {
		return false;
		}

		private void initOrResetVelocityTracker() {
		if (mVelocityTracker == null) {
		mVelocityTracker = VelocityTracker.obtain();
		} else {
		mVelocityTracker.clear();
		}
		}

		private void initVelocityTrackerIfNotExists() {
		if (mVelocityTracker == null) {
		mVelocityTracker = VelocityTracker.obtain();
		}
		}

		private void recycleVelocityTracker() {
		if (mVelocityTracker != null) {
		mVelocityTracker.recycle();
		mVelocityTracker = null;
		}
		}

		@Override
		public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
		if (disallowIntercept) {
		recycleVelocityTracker();
		}
		super.requestDisallowInterceptTouchEvent(disallowIntercept);
		}

		@Override
		public boolean onInterceptTouchEvent(MotionEvent ev) {
		/*
		@@ -440,6 +469,8 @@ public class HorizontalScrollView extends FrameLayout {
		if (xDiff > mTouchSlop) {
		mIsBeingDragged = true;
		mLastMotionX = x;
		initVelocityTrackerIfNotExists();
		mVelocityTracker.addMovement(ev);
		if (mParent != null) mParent.requestDisallowInterceptTouchEvent(true);
		}
		break;
		@@ -449,6 +480,7 @@ public class HorizontalScrollView extends FrameLayout {
		final float x = ev.getX();
		if (!inChild((int) x, (int) ev.getY())) {
		mIsBeingDragged = false;
		recycleVelocityTracker();
		break;
		}

		@@ -459,6 +491,9 @@ public class HorizontalScrollView extends FrameLayout {
		mLastMotionX = x;
		mActivePointerId = ev.getPointerId(0);

		initOrResetVelocityTracker();
		mVelocityTracker.addMovement(ev);

		/*
		* If being flinged and user touches the screen, initiate drag;
		* otherwise don't. mScroller.isFinished should be false when
		@@ -498,9 +533,7 @@ public class HorizontalScrollView extends FrameLayout {

		@Override
		public boolean onTouchEvent(MotionEvent ev) {
		if (mVelocityTracker == null) {
		mVelocityTracker = VelocityTracker.obtain();
		}
		initVelocityTrackerIfNotExists();
		mVelocityTracker.addMovement(ev);

		final int action = ev.getAction();
		@@ -584,11 +617,8 @@ public class HorizontalScrollView extends FrameLayout {

		mActivePointerId = INVALID_POINTER;
		mIsBeingDragged = false;
		recycleVelocityTracker();

		if (mVelocityTracker != null) {
		mVelocityTracker.recycle();
		mVelocityTracker = null;
		}
		if (mEdgeGlowLeft != null) {
		mEdgeGlowLeft.onRelease();
		mEdgeGlowRight.onRelease();
		@@ -602,10 +632,8 @@ public class HorizontalScrollView extends FrameLayout {
		}
		mActivePointerId = INVALID_POINTER;
		mIsBeingDragged = false;
		if (mVelocityTracker != null) {
		mVelocityTracker.recycle();
		mVelocityTracker = null;
		}
		recycleVelocityTracker();

		if (mEdgeGlowLeft != null) {
		mEdgeGlowLeft.onRelease();
		mEdgeGlowRight.onRelease();

core/java/android/widget/ScrollView.java

+38 −7

Original line number	Diff line number	Diff line
		@@ -408,6 +408,36 @@ public class ScrollView extends FrameLayout {
		return false;
		}

		private void initOrResetVelocityTracker() {
		if (mVelocityTracker == null) {
		mVelocityTracker = VelocityTracker.obtain();
		} else {
		mVelocityTracker.clear();
		}
		}

		private void initVelocityTrackerIfNotExists() {
		if (mVelocityTracker == null) {
		mVelocityTracker = VelocityTracker.obtain();
		}
		}

		private void recycleVelocityTracker() {
		if (mVelocityTracker != null) {
		mVelocityTracker.recycle();
		mVelocityTracker = null;
		}
		}

		@Override
		public void requestDisallowInterceptTouchEvent(boolean disallowIntercept) {
		if (disallowIntercept) {
		recycleVelocityTracker();
		}
		super.requestDisallowInterceptTouchEvent(disallowIntercept);
		}


		@Override
		public boolean onInterceptTouchEvent(MotionEvent ev) {
		/*
		@@ -449,6 +479,8 @@ public class ScrollView extends FrameLayout {
		if (yDiff > mTouchSlop) {
		mIsBeingDragged = true;
		mLastMotionY = y;
		initVelocityTrackerIfNotExists();
		mVelocityTracker.addMovement(ev);
		if (mScrollStrictSpan == null) {
		mScrollStrictSpan = StrictMode.enterCriticalSpan("ScrollView-scroll");
		}
		@@ -460,6 +492,7 @@ public class ScrollView extends FrameLayout {
		final float y = ev.getY();
		if (!inChild((int) ev.getX(), (int) y)) {
		mIsBeingDragged = false;
		recycleVelocityTracker();
		break;
		}

		@@ -470,6 +503,8 @@ public class ScrollView extends FrameLayout {
		mLastMotionY = y;
		mActivePointerId = ev.getPointerId(0);

		initOrResetVelocityTracker();
		mVelocityTracker.addMovement(ev);
		/*
		* If being flinged and user touches the screen, initiate drag;
		* otherwise don't. mScroller.isFinished should be false when
		@@ -487,6 +522,7 @@ public class ScrollView extends FrameLayout {
		/* Release the drag */
		mIsBeingDragged = false;
		mActivePointerId = INVALID_POINTER;
		recycleVelocityTracker();
		if (mScroller.springBack(mScrollX, mScrollY, 0, 0, 0, getScrollRange())) {
		invalidate();
		}
		@@ -505,9 +541,7 @@ public class ScrollView extends FrameLayout {

		@Override
		public boolean onTouchEvent(MotionEvent ev) {
		if (mVelocityTracker == null) {
		mVelocityTracker = VelocityTracker.obtain();
		}
		initVelocityTrackerIfNotExists();
		mVelocityTracker.addMovement(ev);

		final int action = ev.getAction();
		@@ -1441,10 +1475,7 @@ public class ScrollView extends FrameLayout {
		private void endDrag() {
		mIsBeingDragged = false;

		if (mVelocityTracker != null) {
		mVelocityTracker.recycle();
		mVelocityTracker = null;
		}
		recycleVelocityTracker();

		if (mEdgeGlowTop != null) {
		mEdgeGlowTop.onRelease();

packages/SystemUI/src/com/android/systemui/recent/RecentsHorizontalScrollView.java

+3 −0

Original line number	Diff line number	Diff line
		@@ -120,6 +120,9 @@ public class RecentsHorizontalScrollView extends HorizontalScrollView
		}

		public void onBeginDrag(View v) {
		// We do this so the underlying ScrollView knows that it won't get
		// the chance to intercept events anymore
		requestDisallowInterceptTouchEvent(true);
		}

		public View getChildAtPosition(MotionEvent ev) {

packages/SystemUI/src/com/android/systemui/recent/RecentsVerticalScrollView.java

+3 −0

Original line number	Diff line number	Diff line
		@@ -135,6 +135,9 @@ public class RecentsVerticalScrollView extends ScrollView implements SwipeHelper
		}

		public void onBeginDrag(View v) {
		// We do this so the underlying ScrollView knows that it won't get
		// the chance to intercept events anymore
		requestDisallowInterceptTouchEvent(true);
		}

		public View getChildAtPosition(MotionEvent ev) {