Fix jump in two-finger expand motion with no notifications

Bug: 18185048
Change-Id: Ib54789e45b7b68a5fc9d6056cb53de23b2be3260

2 files changed, 14 insertions, 0 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 d9e44c3..5077542 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
@@ -1329,6 +1329,16 @@ public class NotificationPanelView extends PanelView implements
         float notificationHeight = mNotificationStackScroller.getHeight()
                 - mNotificationStackScroller.getEmptyBottomMargin()
                 - mNotificationStackScroller.getTopPadding();
+
+        // When only empty shade view is visible in QS collapsed state, simulate that we would have
+        // it in expanded QS state as well so we don't run into troubles when fading the view in/out
+        // and expanding/collapsing the whole panel from/to quick settings.
+        if (mNotificationStackScroller.getNotGoneChildCount() == 0
+                && mShadeEmpty) {
+            notificationHeight = mNotificationStackScroller.getEmptyShadeViewHeight()
+                    + mNotificationStackScroller.getBottomStackPeekSize()
+                    + mNotificationStackScroller.getCollapseSecondCardPadding();
+        }
         float totalHeight = Math.max(
                 mQsMaxExpansionHeight + mNotificationStackScroller.getNotificationTopPadding(),
                 mClockPositionResult.stackScrollerPadding - mTopPaddingAdjustment)
diff --git a/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java b/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java
index 87ce565..d543cff 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/stack/NotificationStackScrollLayout.java
@@ -2272,6 +2272,10 @@ public class NotificationStackScrollLayout extends ViewGroup
         return height;
     }
 
+    public int getEmptyShadeViewHeight() {
+        return mEmptyShadeView.getHeight();
+    }
+
     public float getBottomMostNotificationBottom() {
         final int count = getChildCount();
         float max = 0;