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# delegate.cpp Example File
itemviews/spinboxdelegate/delegate.cpp

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        /*
            delegate.cpp

            A delegate that allows the user to change integer values from the model
            using a spin box widget.
        */

        #include <QtGui>

        #include "delegate.h"

        SpinBoxDelegate::SpinBoxDelegate(QObject *parent)
            : QItemDelegate(parent)
        {
        }

        QWidget *SpinBoxDelegate::createEditor(QWidget *parent,
            const QStyleOptionViewItem &/* option */,
            const QModelIndex &/* index */) const
        {
            QSpinBox *editor = new QSpinBox(parent);
            editor->setMinimum(0);
            editor->setMaximum(100);
            editor->installEventFilter(const_cast<SpinBoxDelegate*>(this));

            return editor;
        }

        void SpinBoxDelegate::setEditorData(QWidget *editor,
                                            const QModelIndex &index) const
        {
            int value = index.model()->data(index,
                QAbstractItemModel::DisplayRole).toInt();

            QSpinBox *spinBox = static_cast<QSpinBox*>(editor);
            spinBox->setValue(value);
        }

        void SpinBoxDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
                                           const QModelIndex &index) const
        {
            QSpinBox *spinBox = static_cast<QSpinBox*>(editor);
            spinBox->interpretText();
            int value = spinBox->value();

            model->setData(index, value);
        }

        void SpinBoxDelegate::updateEditorGeometry(QWidget *editor,
            const QStyleOptionViewItem &option, const QModelIndex &/* index */) const
        {
            editor->setGeometry(option.rect);
        }