Make home send tap commands to live wallpaper.

(This only applies to taps on empty spaces)

src/com/android/launcher2/CellLayout.java

@@ -59,6 +59,8 @@ public class CellLayout extends ViewGroup {
 
     private boolean mDirtyTag;
     
+    private boolean mLastDownOnOccupiedCell = false;
+
     public CellLayout(Context context) {
         this(context, null);
     }
@@ -177,6 +179,8 @@ public class CellLayout extends ViewGroup {
                 }
             }
             
+            mLastDownOnOccupiedCell = found;
+
             if (!found) {
                 int cellXY[] = mCellXY;
                 pointToCellExact(x, y, cellXY);
@@ -1039,6 +1043,10 @@ out:            for (int i = x; i < x + spanX - 1 && x < xCount; i++) {
                     ", y=" + cellY + "]";
         }
     }
+
+    public boolean lastDownOnOccupiedCell() {
+        return mLastDownOnOccupiedCell;
+    }
 }
 
 

src/com/android/launcher2/Workspace.java

@@ -735,10 +735,22 @@ public class Workspace extends ViewGroup implements DropTarget, DragSource, Drag
 
             case MotionEvent.ACTION_CANCEL:
             case MotionEvent.ACTION_UP:
+                
+                if (mTouchState != TOUCH_STATE_SCROLLING) {
+                    
+                    final CellLayout currentScreen = (CellLayout)getChildAt(mCurrentScreen);
+                    if (!currentScreen.lastDownOnOccupiedCell()) {
+                        // Send a tap to the wallpaper if the last down was on empty space
+                        mWallpaperManager.sendWallpaperCommand(getWindowToken(), 
+                                "android.wallpaper.tap", (int) ev.getX(), (int) ev.getY(), 0, null);
+                    }
+                }
+                
                 // Release the drag
                 clearChildrenCache();
                 mTouchState = TOUCH_STATE_REST;
                 mAllowLongPress = false;
+
                 break;
         }