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Use alpha instead of invisible for views below shelf to skip redraw

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Also skip this for heads up notifications

Fixes: 193912541
Test: treehugger
Change-Id: I3c81611696f7918a0f18d4c503b80a6b78ed2c43
This commit is contained in:
Lyn Han
2021-07-19 15:31:36 -05:00
parent db294649f8
commit ef12c7a2b2
1 changed files with 10 additions and 4 deletions
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14
packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/StackScrollAlgorithm.java
View File

@@ -154,15 +154,21 @@ public class StackScrollAlgorithm {
shelf.updateState(algorithmState, ambientState);
// After the shelf has updated its yTranslation,
// explicitly hide views below the shelf to skip rendering them in the hardware layer.
// After the shelf has updated its yTranslation, explicitly set alpha=0 for view below shelf
// to skip rendering them in the hardware layer. We do not set them invisible because that
// runs invalidate & onDraw when these views return onscreen, which is more expensive.
final float shelfTop = shelf.getViewState().yTranslation;
for (ExpandableView view : algorithmState.visibleChildren) {
if (view instanceof ExpandableNotificationRow) {
ExpandableNotificationRow row = (ExpandableNotificationRow) view;
if (row.isHeadsUp() || row.isHeadsUpAnimatingAway()) {
continue;
}
}
final float viewTop = view.getViewState().yTranslation;
if (viewTop >= shelfTop) {
view.getViewState().hidden = true;
view.getViewState().alpha = 0;
}
}
}