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# diagramscene.h Example File
graphicsview/diagramscene/diagramscene.h

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     #ifndef DIAGRAMSCENE_H
     #define DIAGRAMSCENE_H

     #include <QGraphicsScene>
     #include "diagramitem.h"
     #include "diagramtextitem.h"

     class QGraphicsSceneMouseEvent;
     class QMenu;
     class QPointF;
     class QGraphicsLineItem;
     class QFont;
     class QGraphicsTextItem;
     class QColor;

     class DiagramScene : public QGraphicsScene
     {
         Q_OBJECT

     public:
         enum Mode { InsertItem, InsertLine, InsertText, MoveItem };

         DiagramScene(QMenu *itemMenu, QObject *parent = 0);
         QFont font() const
             { return myFont; }
         QColor textColor() const
             { return myTextColor; }
         QColor itemColor() const
             { return myItemColor; }
         QColor lineColor() const
             { return myLineColor; }
         void setLineColor(const QColor &color);
         void setTextColor(const QColor &color);
         void setItemColor(const QColor &color);
         void setFont(const QFont &font);

     public slots:
         void setMode(Mode mode);
         void setItemType(DiagramItem::DiagramType type);
         void editorLostFocus(DiagramTextItem *item);

     signals:
         void itemInserted(DiagramItem *item);
         void textInserted(QGraphicsTextItem *item);
         void itemSelected(QGraphicsItem *item);

     protected:
         void mousePressEvent(QGraphicsSceneMouseEvent *mouseEvent);
         void mouseMoveEvent(QGraphicsSceneMouseEvent *mouseEvent);
         void mouseReleaseEvent(QGraphicsSceneMouseEvent *mouseEvent);

     private:
         bool isItemChange(int type);

         DiagramItem::DiagramType myItemType;
         QMenu *myItemMenu;
         Mode myMode;
         bool leftButtonDown;
         QPointF startPoint;
         QGraphicsLineItem *line;
         QFont myFont;
         DiagramTextItem *textItem;
         QColor myTextColor;
         QColor myItemColor;
         QColor myLineColor;
     };

     #endif