From b3a6f1e96d0df9df312b23da50059f464ef7c4c8 Mon Sep 17 00:00:00 2001
From: Xiyuan Xia <xiyuan@google.com>
Date: Tue, 28 Apr 2015 16:17:18 -0700
Subject: [PATCH] Update bottom area alpha when stack height changes

Bottom area alpha depends on stack scroller's notification top Y
which depends on stack translation which changes when stack height
changes. Thus the bottom area alpha needs to be updated when stack
height changes.

Bug: 20457060
Change-Id: Ibcc95c830a83737732aa15147cd82d21f2ee9161
---
 .../systemui/statusbar/phone/NotificationPanelView.java  | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
index b87c25b43ba52..f8cb6892e013e 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
@@ -327,7 +327,7 @@ public class NotificationPanelView extends PanelView implements
         } else if (!mQsExpanded) {
             setQsExpansion(mQsMinExpansionHeight + mLastOverscroll);
         }
-        mNotificationStackScroller.setStackHeight(getExpandedHeight());
+        updateStackHeight(getExpandedHeight());
         updateHeader();
         mNotificationStackScroller.updateIsSmallScreen(
                 mHeader.getCollapsedHeight() + mQsPeekHeight);
@@ -1457,7 +1457,7 @@ public class NotificationPanelView extends PanelView implements
             setQsExpansion(mQsMinExpansionHeight
                     + t * (getTempQsMaxExpansion() - mQsMinExpansionHeight));
         }
-        mNotificationStackScroller.setStackHeight(expandedHeight);
+        updateStackHeight(expandedHeight);
         updateHeader();
         updateUnlockIcon();
         updateNotificationTranslucency();
@@ -2241,4 +2241,9 @@ public class NotificationPanelView extends PanelView implements
         mScrollView.setTranslationX(translation);
         mHeader.setTranslationX(translation);
     }
+
+    private void updateStackHeight(float stackHeight) {
+        mNotificationStackScroller.setStackHeight(stackHeight);
+        updateKeyguardBottomAreaAlpha();
+    }
 }