Tuned anti-falsing thresholds on the lockscreen

Also added logic to provide nicer animations when falsing.
In addition adapted the clock scale slightly if dragging
in the void.

Bug: 15433087
Change-Id: I4d8eb26cc81d22647ef4d2eca1e69b4994a7f1e2
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 d3c3f56..4956f88 100644
--- a/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
+++ b/packages/SystemUI/src/com/android/systemui/statusbar/phone/NotificationPanelView.java
@@ -551,7 +551,7 @@
     }
 
     private boolean flingExpandsQs(float vel) {
-        if (!mQsTouchAboveFalsingThreshold && mStatusBarState == StatusBarState.KEYGUARD) {
+        if (isBelowFalsingThreshold()) {
             return false;
         }
         if (Math.abs(vel) < mFlingAnimationUtils.getMinVelocityPxPerSecond()) {
@@ -561,6 +561,10 @@
         }
     }
 
+    private boolean isBelowFalsingThreshold() {
+        return !mQsTouchAboveFalsingThreshold && mStatusBar.isFalsingThresholdNeeded();
+    }
+
     private float getQsExpansionFraction() {
         return Math.min(1f, (mQsExpansionHeight - mQsMinExpansionHeight)
                 / (getTempQsMaxExpansion() - mQsMinExpansionHeight));
@@ -1125,9 +1129,16 @@
             }
             return;
         }
+        boolean belowFalsingThreshold = isBelowFalsingThreshold();
+        if (belowFalsingThreshold) {
+            vel = 0;
+        }
         mScrollView.setBlockFlinging(true);
         ValueAnimator animator = ValueAnimator.ofFloat(mQsExpansionHeight, target);
         mFlingAnimationUtils.apply(animator, mQsExpansionHeight, target, vel);
+        if (belowFalsingThreshold) {
+            animator.setDuration(350);
+        }
         animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
             @Override
             public void onAnimationUpdate(ValueAnimator animation) {
@@ -1732,9 +1743,9 @@
     }
 
     public void setEmptyDragAmount(float amount) {
-        float factor = 1f;
+        float factor = 0.8f;
         if (mNotificationStackScroller.getNotGoneChildCount() > 0) {
-            factor = 0.6f;
+            factor = 0.4f;
         } else if (!mStatusBar.hasActiveNotifications()) {
             factor = 0.4f;
         }