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Commit da33d0d1 authored by Android (Google) Code Review's avatar Android (Google) Code Review
Browse files

Merge change 1424 into donut 

* changes:
  Fixes 1844680. Interrupted scrolling could lead to rendering artifacts. The ListView was invalidating itself in opaque mode but before the drawing could happen, it was getting rid of its scrolling cache, thus becoming translucent again.
parents c70b6444 6dfed241

core/java/android/widget/AbsListView.java

+24 −16
Original line number Diff line number Diff line
@@ -434,6 +434,8 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te 
    private InputConnection mDefInputConnection;

    private InputConnectionWrapper mPublicInputConnection;



    private Runnable mClearScrollingCache;



    /**

     * Interface definition for a callback to be invoked when the list or grid

     * has been scrolled.
@@ -1947,7 +1949,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te 
                if (y != mLastY) {

                    deltaY -= mMotionCorrection;

                    int incrementalDeltaY = mLastY != Integer.MIN_VALUE ? y - mLastY : deltaY;

                    trackMotionScroll(deltaY, incrementalDeltaY, true);

                    trackMotionScroll(deltaY, incrementalDeltaY);



                    // Check to see if we have bumped into the scroll limit

                    View motionView = this.getChildAt(mMotionPosition - mFirstPosition);
@@ -2286,7 +2288,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te 
                delta = Math.max(-(getHeight() - mPaddingBottom - mPaddingTop - 1), delta);

            }



            trackMotionScroll(delta, delta, false);

            trackMotionScroll(delta, delta);



            // Check to see if we have bumped into the scroll limit

            View motionView = getChildAt(mMotionPosition - mFirstPosition);
@@ -2323,6 +2325,9 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te 
    }



    private void clearScrollingCache() {

        if (mClearScrollingCache == null) {

            mClearScrollingCache = new Runnable() {

                public void run() {

                    if (mCachingStarted) {

                        mCachingStarted = false;

                        setChildrenDrawnWithCacheEnabled(false);
@@ -2334,6 +2339,10 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te 
                        }

                    }

                }

            };

        }

        post(mClearScrollingCache);

    }



    /**

     * Track a motion scroll
@@ -2341,9 +2350,8 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te 
     * @param deltaY Amount to offset mMotionView. This is the accumulated delta since the motion

     *        began. Positive numbers mean the user's finger is moving down the screen.

     * @param incrementalDeltaY Change in deltaY from the previous event.

     * @param invalidate True to make this method call invalidate(), false otherwise.

     */

    void trackMotionScroll(int deltaY, int incrementalDeltaY, boolean invalidate) {

    void trackMotionScroll(int deltaY, int incrementalDeltaY) {

        final int childCount = getChildCount();

        if (childCount == 0) {

            return;
@@ -2377,7 +2385,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te 
        if (spaceAbove >= absIncrementalDeltaY && spaceBelow >= absIncrementalDeltaY) {

            hideSelector();

            offsetChildrenTopAndBottom(incrementalDeltaY);

            if (invalidate) invalidate();

            invalidate();

            mMotionViewNewTop = mMotionViewOriginalTop + deltaY;

        } else {

            final int firstPosition = mFirstPosition;
@@ -2455,7 +2463,7 @@ public abstract class AbsListView extends AdapterView<ListAdapter> implements Te 
                mFirstPosition += count;

            }



            if (invalidate) invalidate();

            invalidate();

            fillGap(down);

            mBlockLayoutRequests = false;