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delegate.h Example File
itemviews/spinboxdelegate/delegate.h

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 #ifndef DELEGATE_H
 #define DELEGATE_H

 #include <QItemDelegate>
 #include <QModelIndex>
 #include <QObject>
 #include <QSize>
 #include <QSpinBox>

 class SpinBoxDelegate : public QItemDelegate
 {
     Q_OBJECT

 public:
     SpinBoxDelegate(QObject *parent = 0);

     QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                           const QModelIndex &index) const;

     void setEditorData(QWidget *editor, const QModelIndex &index) const;
     void setModelData(QWidget *editor, QAbstractItemModel *model,
                       const QModelIndex &index) const;

     void updateEditorGeometry(QWidget *editor,
         const QStyleOptionViewItem &option, const QModelIndex &index) const;
 };

 #endif