imagedelegate.cpp Example File

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 #include <QtWidgets>

 #include "imagedelegate.h"
 #include "iconpreviewarea.h"

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

 QWidget *ImageDelegate::createEditor(QWidget *parent,
                                      const QStyleOptionViewItem & /* option */,
                                      const QModelIndex &index) const
 {
     QComboBox *comboBox = new QComboBox(parent);
     if (index.column() == 1)
         comboBox->addItems(IconPreviewArea::iconModeNames());
     else if (index.column() == 2)
         comboBox->addItems(IconPreviewArea::iconStateNames());

     connect(comboBox, QOverload<int>::of(&QComboBox::activated),
             this, &ImageDelegate::emitCommitData);

     return comboBox;
 }

 void ImageDelegate::setEditorData(QWidget *editor,
                                   const QModelIndex &index) const
 {
     QComboBox *comboBox = qobject_cast<QComboBox *>(editor);
     if (!comboBox)
         return;

     int pos = comboBox->findText(index.model()->data(index).toString(),
                                  Qt::MatchExactly);
     comboBox->setCurrentIndex(pos);
 }

 void ImageDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
                                  const QModelIndex &index) const
 {
     QComboBox *comboBox = qobject_cast<QComboBox *>(editor);
     if (!comboBox)
         return;

     model->setData(index, comboBox->currentText());
 }

 void ImageDelegate::emitCommitData()
 {
     emit commitData(qobject_cast<QWidget *>(sender()));
 }