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Commit 7d071ae0 authored by Matthew Ng's avatar Matthew Ng
Browse files

Low ram devices recents list is throwable 

On a low ram device, the recents list can be thrown when flinging. It
can skip more tasks in the list when flinged harder.

Change-Id: Ie21309f97178b79121d4edc42541f45b13cf5931
Fixes: 64584893
Bug: 62251652
Test: manual - use low end device to go recents with items and fling
parent ed0c5cf4

packages/SystemUI/src/com/android/systemui/recents/views/TaskStackViewScroller.java

+18 −5
Original line number Diff line number Diff line
@@ -89,6 +89,9 @@ public class TaskStackViewScroller { 
        mContext = context;

        mCb = cb;

        mScroller = new OverScroller(context);

        if (Recents.getConfiguration().isLowRamDevice) {

            mScroller.setFriction(0.06f);

        }

        mLayoutAlgorithm = layoutAlgorithm;

        mFlingAnimationUtils = new FlingAnimationUtils(context, 0.3f);

    }
@@ -195,7 +198,6 @@ public class TaskStackViewScroller { 
        return Float.compare(getScrollAmountOutOfBounds(mStackScrollP), 0f) != 0;

    }





    /**

     * Scrolls the closest task and snaps into place. Only used in recents for low ram devices.

     * @param velocity of scroll
@@ -208,19 +210,30 @@ public class TaskStackViewScroller { 
                || stackScroll > mLayoutAlgorithm.mMaxScrollP) {

            return;

        }



        TaskStackLowRamLayoutAlgorithm algorithm = mLayoutAlgorithm.mTaskStackLowRamLayoutAlgorithm;

        float newScrollP = algorithm.getClosestTaskP(stackScroll,

                mLayoutAlgorithm.mNumStackTasks, velocity);

        float flingThreshold = ViewConfiguration.get(mContext).getScaledMinimumFlingVelocity();



        float flingThreshold = ViewConfiguration.get(mContext).getScaledMinimumFlingVelocity();

        if (Math.abs(velocity) > flingThreshold) {

            int minY = algorithm.percentageToScroll(mLayoutAlgorithm.mMinScrollP);

            int maxY = algorithm.percentageToScroll(mLayoutAlgorithm.mMaxScrollP);



            // Calculate the fling and snap to closest task from final y position, computeScroll()

            // never runs when cancelled with animateScroll() and the overscroll is not calculated

            // here

            fling(0 /* downScrollP */, 0 /* downY */, algorithm.percentageToScroll(stackScroll),

                    -velocity, minY, maxY, 0 /* overscroll */);

            float pos = algorithm.scrollToPercentage(mScroller.getFinalY());



            float newScrollP = algorithm.getClosestTaskP(pos, mLayoutAlgorithm.mNumStackTasks,

                    velocity);

            ValueAnimator animator = ObjectAnimator.ofFloat(stackScroll, newScrollP);

            mFlingAnimationUtils.apply(animator, algorithm.percentageToScroll(stackScroll),

                    algorithm.percentageToScroll(newScrollP), velocity);

            animateScroll(newScrollP, (int) animator.getDuration(), animator.getInterpolator(),

                    null /* postRunnable */);

        } else {

            float newScrollP = algorithm.getClosestTaskP(stackScroll,

                    mLayoutAlgorithm.mNumStackTasks, velocity);

            animateScroll(newScrollP, 300, Interpolators.ACCELERATE_DECELERATE,

                    null /* postRunnable */);

        }