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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