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Commit 6dfed241 authored by Romain Guy's avatar Romain Guy
Browse files

Fixes 1844680. Interrupted scrolling could lead to rendering artifacts. The... 

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.
parent 08f3b526

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;