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Commit ef12c7a2 authored by Lyn Han's avatar Lyn Han
Browse files

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
parent db294649

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;

            }

        }

    }