tweaking parallax effect

- adding vertical parallax when switching to all apps/customize mode
- added effect to have parallax lag the rest of scrolling
- adjusted the amount of horizontal/vertical parallax in both portrait and landscape modes

Change-Id: I5ee778f78c1080337f642217bcf828b2392ddf70

1 files changed, 8 insertions, 0 deletions

diff --git a/src/com/android/launcher2/PagedView.java b/src/com/android/launcher2/PagedView.java
index 6c9aac1db..bb59678f6 100644
--- a/src/com/android/launcher2/PagedView.java
+++ b/src/com/android/launcher2/PagedView.java
@@ -888,6 +888,14 @@ public abstract class PagedView extends ViewGroup {
         invalidate();
     }
 
+    protected float maxOverScroll() {
+        // Using the formula in overScroll, assuming that f = 1.0 (which it should generally not
+        // exceed). Used to find out how much extra wallpaper we need for the overscroll effect
+        float f = 1.0f;
+        f = f / (Math.abs(f)) * (overScrollInfluenceCurve(Math.abs(f)));
+        return OVERSCROLL_DAMP_FACTOR * f;
+    }
+
     @Override
     public boolean onTouchEvent(MotionEvent ev) {
         // Skip touch handling if there are no pages to swipe