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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, 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);
     }