Add ViewConfiguration.getScaledScrollFactor()

This value is used to convert ACTION_SCROLL axis values into raw
pixel distances.

Change-Id: I537af010610bb374ab29a41aff4fae5b07bece6e

1 files changed, 18 insertions, 0 deletions

diff --git a/core/java/android/view/ViewConfiguration.java b/core/java/android/view/ViewConfiguration.java
index 9a73d0b1bfaa..33b488fbc6b4 100644
--- a/core/java/android/view/ViewConfiguration.java
+++ b/core/java/android/view/ViewConfiguration.java
@@ -219,6 +219,12 @@ public class ViewConfiguration {
     private static final int OVERFLING_DISTANCE = 6;
 
     /**
+     * Amount to scroll in response to a {@link MotionEvent#ACTION_SCROLL} event, in dips per
+     * axis value.
+     */
+    private static final int SCROLL_FACTOR = 64;
+
+    /**
      * Default duration to hide an action mode for.
      */
     private static final long ACTION_MODE_HIDE_DURATION_DEFAULT = 2000;
@@ -246,6 +252,7 @@ public class ViewConfiguration {
     private final int mOverflingDistance;
     private final boolean mFadingMarqueeEnabled;
     private final long mGlobalActionsKeyTimeout;
+    private final int mScrollFactor;
 
     private boolean sHasPermanentMenuKey;
     private boolean sHasPermanentMenuKeySet;
@@ -274,6 +281,7 @@ public class ViewConfiguration {
         mOverflingDistance = OVERFLING_DISTANCE;
         mFadingMarqueeEnabled = true;
         mGlobalActionsKeyTimeout = GLOBAL_ACTIONS_KEY_TIMEOUT;
+        mScrollFactor = SCROLL_FACTOR;
     }
 
     /**
@@ -357,6 +365,8 @@ public class ViewConfiguration {
                 com.android.internal.R.dimen.config_viewMaxFlingVelocity);
         mGlobalActionsKeyTimeout = res.getInteger(
                 com.android.internal.R.integer.config_globalActionsKeyTimeout);
+        mScrollFactor = res.getDimensionPixelSize(
+                com.android.internal.R.dimen.config_scrollFactor);
     }
 
     /**
@@ -669,6 +679,14 @@ public class ViewConfiguration {
     }
 
     /**
+     * @return Amount to scroll in response to a {@link MotionEvent#ACTION_SCROLL} event. Multiply
+     * this by the event's axis value to obtain the number of pixels to be scrolled.
+     */
+    public int getScaledScrollFactor() {
+        return mScrollFactor;
+    }
+
+    /**
      * The maximum drawing cache size expressed in bytes.
      *
      * @return the maximum size of View's drawing cache expressed in bytes