mainwindow.h Example File

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QMainWindow>

 class QAction;
 class QToolBar;
 class QMenu;
 class QUndoStack;
 class QUndoView;

 class DiagramScene;
 class DiagramItem;

 class MainWindow : public QMainWindow
 {
     Q_OBJECT

 public:
     MainWindow();

 public slots:
     void itemMoved(DiagramItem *movedDiagram, const QPointF &moveStartPosition);

 private slots:
     void deleteItem();
     void addBox();
     void addTriangle();
     void about();
     void itemMenuAboutToShow();
     void itemMenuAboutToHide();

 private:
     void createActions();
     void createMenus();
     void createUndoView();

     QAction *deleteAction;
     QAction *addBoxAction;
     QAction *addTriangleAction;
     QAction *undoAction;
     QAction *redoAction;
     QAction *exitAction;
     QAction *aboutAction;

     QMenu *fileMenu;
     QMenu *editMenu;
     QMenu *itemMenu;
     QMenu *helpMenu;

     DiagramScene *diagramScene;
     QUndoStack *undoStack;
     QUndoView *undoView;
 };

 #endif