foundational node UI work

ui/nodeui.h

@@ -0,0 +1,21 @@
+#ifndef NODEUI_H
+#define NODEUI_H
+
+#include <QWidget>
+#include <QGraphicsItem>
+
+#include "ui/nodewidget.h"
+
+class NodeUI : public QGraphicsRectItem {
+public:
+  NodeUI();
+  void AddToScene(QGraphicsScene* scene);
+  void Resize(const QSize& s);
+protected:
+  virtual void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget = nullptr) override;
+
+private:
+  NodeWidget central_widget_;
+};
+
+#endif // NODEUI_H