Use ObjectAnimator for fading scrollbars, set initial duration to 1500

Fairly intensive refactoring of ScrollabilityCache.

Change-Id: I88669c0b9b79ca12a237606d5ff8be0e7e8b37ba

1 files changed, 17 insertions, 1 deletions

diff --git a/core/java/android/view/ViewConfiguration.java b/core/java/android/view/ViewConfiguration.java
index 4e91ad4db977..d7335137140e 100644
--- a/core/java/android/view/ViewConfiguration.java
+++ b/core/java/android/view/ViewConfiguration.java
@@ -47,6 +47,12 @@ public class ViewConfiguration {
     private static final int SCROLL_BAR_DEFAULT_DELAY = 300;
 
     /**
+     * Default delay before the scrollbars fade in milliseconds for the first
+     * time they are shown to the user.
+     */
+    private static final int SCROLL_BAR_DEFAULT_INITIAL_DELAY = 1500;
+
+    /**
      * Defines the length of the fading edges in dips
      */
     private static final int FADING_EDGE_LENGTH = 12;
@@ -395,13 +401,23 @@ public class ViewConfiguration {
     }
 
     /**
-     * @return Default delay before the scrollbars fade in milliseconds
+     * @return Default delay in milliseconds before the scrollbars fade out
+     *         after they have been awoken.
      */
     public static int getScrollDefaultDelay() {
         return SCROLL_BAR_DEFAULT_DELAY;
     }
 
     /**
+     * @return Default delay in milliseconds before the scrollbars fade out
+     *         after they are initially shown to the user.
+     * @hide Pending cleanup of ViewConfiguration values.
+     */
+    public static int getScrollDefaultInitialDelay() {
+        return SCROLL_BAR_DEFAULT_INITIAL_DELAY;
+    }
+
+    /**
      * @return the length of the fading edges in dips
      *
      * @deprecated Use {@link #getScaledFadingEdgeLength()} instead.