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pixeldelegate.h Example File
itemviews/pixelator/pixeldelegate.h

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 #ifndef PIXELDELEGATE_H
 #define PIXELDELEGATE_H

 #include <QAbstractItemDelegate>
 #include <QFontMetrics>
 #include <QModelIndex>
 #include <QSize>

 class QAbstractItemModel;
 class QObject;
 class QPainter;

 static const int ItemSize = 256;

 class PixelDelegate : public QAbstractItemDelegate
 {
     Q_OBJECT

 public:
     PixelDelegate(QObject *parent = 0);

     void paint(QPainter *painter, const QStyleOptionViewItem &option,
                const QModelIndex &index) const;

     QSize sizeHint(const QStyleOptionViewItem &option,
                    const QModelIndex &index ) const;

 public slots:
     void setPixelSize(int size);

 private:
     int pixelSize;
 };

 #endif