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coloritem.h Example File
graphicsview/dragdroprobot/coloritem.h

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 #ifndef COLORITEM_H
 #define COLORITEM_H

 #include <QGraphicsItem>

 class ColorItem : public QGraphicsItem
 {
 public:
     ColorItem();

     QRectF boundingRect() const;
     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget);

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

 private:
     QColor color;
 };

 #endif


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Qt 4.6.3