Implement support for scrolling a wallpaper.

This currently only works for a wallpaper that is larger than the
screen.  Set the scroll position with the new wallpaper API.  Right
now only does jump scrolls.

3 files changed, 29 insertions, 1 deletions

diff --git a/core/java/android/app/WallpaperManager.java b/core/java/android/app/WallpaperManager.java
index 9019b54..78b6cf1 100644
--- a/core/java/android/app/WallpaperManager.java
+++ b/core/java/android/app/WallpaperManager.java
@@ -28,6 +28,7 @@ import android.os.IBinder;
 import android.os.ParcelFileDescriptor;
 import android.os.RemoteException;
 import android.os.ServiceManager;
+import android.view.ViewRoot;
 
 import java.io.FileOutputStream;
 import java.io.IOException;
@@ -312,6 +313,28 @@ public class WallpaperManager {
     }
     
     /**
+     * Set the position of the current wallpaper within any larger space, when
+     * that wallpaper is visible behind the given window.  The X and Y offsets
+     * are floating point numbers ranging from 0 to 1, representing where the
+     * wallpaper should be positioned within the screen space.  These only
+     * make sense when the wallpaper is larger than the screen.
+     * 
+     * @param windowToken The window who these offsets should be associated
+     * with, as returned by {@link android.view.View#getWindowVisibility()
+     * View.getWindowToken()}.
+     * @param xOffset The offset olong the X dimension, from 0 to 1.
+     * @param yOffset The offset along the Y dimension, from 0 to 1.
+     */
+    public void setWallpaperOffsets(IBinder windowToken, float xOffset, float yOffset) {
+        try {
+            ViewRoot.getWindowSession(mContext.getMainLooper()).setWallpaperPosition(
+                    windowToken, xOffset, yOffset);
+        } catch (RemoteException e) {
+            // Ignore.
+        }
+    }
+    
+    /**
      * Remove any currently set wallpaper, reverting to the system's default
      * wallpaper. On success, the intent {@link Intent#ACTION_WALLPAPER_CHANGED}
      * is broadcast.
diff --git a/core/java/android/view/IWindowManager.aidl b/core/java/android/view/IWindowManager.aidl
index 5607d4b..3e6cdc2 100644
--- a/core/java/android/view/IWindowManager.aidl
+++ b/core/java/android/view/IWindowManager.aidl
@@ -90,7 +90,6 @@ interface IWindowManager
     void exitKeyguardSecurely(IOnKeyguardExitResult callback);
     boolean inKeyguardRestrictedInputMode();
 
-    
     // These can only be called with the SET_ANIMATON_SCALE permission.
     float getAnimationScale(int which);
     float[] getAnimationScales();
diff --git a/core/java/android/view/IWindowSession.aidl b/core/java/android/view/IWindowSession.aidl
index 1156856..4d662d2 100644
--- a/core/java/android/view/IWindowSession.aidl
+++ b/core/java/android/view/IWindowSession.aidl
@@ -108,4 +108,10 @@ interface IWindowSession {
     boolean getInTouchMode();
     
     boolean performHapticFeedback(IWindow window, int effectId, boolean always);
+    
+    /**
+     * For windows with the wallpaper behind them, and the wallpaper is
+     * larger than the screen, set the offset within the screen.
+     */
+    void setWallpaperPosition(IBinder windowToken, float x, float y);
 }