work towards group editor

app/widget/nodeview/nodeview.h

@@ -24,6 +24,7 @@
 #include <QGraphicsView>
 #include <QTimer>
 
+#include "core.h"
 #include "node/graph.h"
 #include "node/nodecopypaste.h"
 #include "nodeviewedge.h"
@@ -76,6 +77,11 @@ public:
 
   void ZoomOut();
 
+  void OverrideUndoStack(UndoStack *stack)
+  {
+    undo_stack_ = stack;
+  }
+
   const QVector<Node*> &GetCurrentContexts() const
   {
     return contexts_;
@@ -189,6 +195,8 @@ private:
 
   QMap<NodeViewItem*, QPointF> dragging_items_;
 
+  UndoStack *undo_stack_;
+
   double scale_;
 
   static const double kMinimumScale;