--- a/Framework/Widgets/TestWorldSceneWidget.h	Wed Apr 19 10:28:08 2017 +0200
+++ b/Framework/Widgets/TestWorldSceneWidget.h	Wed Apr 19 14:33:06 2017 +0200
@@ -45,23 +45,27 @@
       class Interactor;
 
       std::auto_ptr<Interactor>   interactor_;
+      bool                        animate_;
+      unsigned int                count_;
 
     protected:
-      virtual SliceGeometry GetSlice()
-      {
-        return SliceGeometry();
-      }
-
       virtual bool RenderScene(CairoContext& context,
                                const ViewportGeometry& view);
 
     public:
-      TestWorldSceneWidget();
+      TestWorldSceneWidget(bool animate);
 
       virtual void GetSceneExtent(double& x1,
                                   double& y1,
                                   double& x2,
                                   double& y2);
+
+      virtual bool HasUpdateContent() const
+      {
+        return animate_;
+      }
+
+      virtual void UpdateContent();
     };
   }
 }