delegate.cpp Example File

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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 <QtWidgets>

 #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);

     return editor;
 }

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

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