diagramscene.h Example File

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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