added method for rightmostWidget of a certain class

TULIP/src/lu/list/itis/dkd/tui/space/SpatialPositioningManager.java

@@ -294,6 +294,37 @@ public class SpatialPositioningManager implements SpatialEventListener {
         return TangibleObjectManager.getWidget(getRightMostObject().getObjectId());
     }
 
+    /**
+     * The method will return the right-most widget, that is, the last widget found based based on
+     * its x-axis coordinate that is of the provided class. The retrieval is based on the underlying
+     * handles.
+     * 
+     * @param <T>
+     * 
+     * @param _class
+     *        The {@link Class} of the widget that should be returned.
+     * 
+     * @return The widget with the largest x-axis coordinate that is of the given class. Returns the
+     *         last if more than one are tied. Will return <code>null</code> if no object is
+     *         present.
+     */
+    @SuppressWarnings("unchecked")
+    public @Nullable <T> T getRightMostWidget(Class<T> _class) {
+        if (getRightMostObject() == null) {
+            return null;
+        }
+
+        for (int i = spatialMatrix.getHorizontal().size() - 1; i >= 0; i--) {
+            TangibleObject object = spatialMatrix.getHorizontal().get(i);
+            BaseWidget widget = TangibleObjectManager.getWidget(object.getObjectId());
+            if (widget.getClass().equals(_class)) {
+                return (T) widget;
+            }
+        }
+
+        return null;
+    }
+
     /**
      * The method will return the right-most tangible object.
      *