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Commit a91988bc authored by Lyn Han's avatar Lyn Han Committed by Android Build Coastguard Worker
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Use alpha instead of invisible for views below shelf to skip redraw 

Also skip this for heads up notifications

Fixes: 193912541
Test: treehugger
Change-Id: I3c81611696f7918a0f18d4c503b80a6b78ed2c43
(cherry picked from commit ef12c7a2)
parent 143febbf

packages/SystemUI/src/com/android/systemui/statusbar/notification/stack/StackScrollAlgorithm.java

+10 −4
Original line number Diff line number Diff line
@@ -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;

            }

        }

    }