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Merge "Making the detached scrollbar catch up faster to the actual scroll position." into ub-launcher3-burnaby

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This commit is contained in:
Winson Chung
2015-08-24 20:30:09 +00:00
committed by Android (Google) Code Review
parent bcbc2ec2cd 51a7d96544
commit 944bfab018
1 changed files with 12 additions and 2 deletions
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src/com/android/launcher3/allapps/AllAppsRecyclerView.java
+12 -2
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@@ -267,8 +267,18 @@ public class AllAppsRecyclerView extends BaseRecyclerView
int diffScrollY = scrollBarY - thumbScrollY;
if (diffScrollY * dy > 0f) {
// User is scrolling in the same direction the thumb needs to catch up to the
// current scroll position.
thumbScrollY += dy < 0 ? Math.max(dy, diffScrollY) : Math.min(dy, diffScrollY);
// current scroll position. We do this by mapping the difference in movement
// from the original scroll bar position to the difference in movement necessary
// in the detached thumb position to ensure that both speed towards the same
// position at either end of the list.
if (dy < 0) {
int offset = (int) ((dy * thumbScrollY) / (float) scrollBarY);
thumbScrollY += Math.max(offset, diffScrollY);
} else {
int offset = (int) ((dy * (availableScrollBarHeight - thumbScrollY)) /
(float) (availableScrollBarHeight - scrollBarY));
thumbScrollY += Math.min(offset, diffScrollY);
}
thumbScrollY = Math.max(0, Math.min(availableScrollBarHeight, thumbScrollY));
mScrollbar.setThumbOffset(scrollBarX, thumbScrollY);
if (scrollBarY == thumbScrollY) {