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, Qt::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);
    }