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Low ram devices recents list is throwable

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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
This commit is contained in:
Matthew Ng
2017-08-15 11:07:21 -07:00
parent ed0c5cf48f
commit 7d071ae0dc
1 changed files with 18 additions and 5 deletions
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23
packages/SystemUI/src/com/android/systemui/recents/views/TaskStackViewScroller.java
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@@ -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 */);
}