work towards timeline/nodeview interactivity

app/widget/nodeview/nodeviewedge.h

@@ -122,6 +122,8 @@ protected:
 private:
   void Init();
 
+  void UpdateCurve();
+
   NodeOutput output_;
 
   NodeInput input_;
@@ -148,6 +150,10 @@ private:
 
   QRectF arrow_bounding_rect_;
 
+  QPointF cached_start_;
+  QPointF cached_end_;
+  bool cached_input_is_expanded_;
+
 };
 
 }