spreadsheetdelegate.cpp Example File

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 #include "spreadsheetdelegate.h"

 #include <QtWidgets>

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

 QWidget *SpreadSheetDelegate::createEditor(QWidget *parent,
                                           const QStyleOptionViewItem &,
                                           const QModelIndex &index) const
 {
     if (index.column() == 1) {
         QDateTimeEdit *editor = new QDateTimeEdit(parent);
         editor->setDisplayFormat("dd/M/yyyy");
         editor->setCalendarPopup(true);
         return editor;
     }

     QLineEdit *editor = new QLineEdit(parent);

     // create a completer with the strings in the column as model
     QStringList allStrings;
     for (int i = 1; i<index.model()->rowCount(); i++) {
         QString strItem(index.model()->data(index.sibling(i, index.column()),
             Qt::EditRole).toString());

         if (!allStrings.contains(strItem))
             allStrings.append(strItem);
     }

     QCompleter *autoComplete = new QCompleter(allStrings);
     editor->setCompleter(autoComplete);
     connect(editor, &QLineEdit::editingFinished, this, &SpreadSheetDelegate::commitAndCloseEditor);
     return editor;
 }

 void SpreadSheetDelegate::commitAndCloseEditor()
 {
     QLineEdit *editor = qobject_cast<QLineEdit *>(sender());
     emit commitData(editor);
     emit closeEditor(editor);
 }

 void SpreadSheetDelegate::setEditorData(QWidget *editor,
     const QModelIndex &index) const
 {
     QLineEdit *edit = qobject_cast<QLineEdit*>(editor);
     if (edit) {
         edit->setText(index.model()->data(index, Qt::EditRole).toString());
         return;
     }

     QDateTimeEdit *dateEditor = qobject_cast<QDateTimeEdit *>(editor);
     if (dateEditor) {
         dateEditor->setDate(QDate::fromString(
                                 index.model()->data(index, Qt::EditRole).toString(),
                                 "d/M/yyyy"));
     }
 }

 void SpreadSheetDelegate::setModelData(QWidget *editor,
     QAbstractItemModel *model, const QModelIndex &index) const
 {
     QLineEdit *edit = qobject_cast<QLineEdit *>(editor);
     if (edit) {
         model->setData(index, edit->text());
         return;
     }

     QDateTimeEdit *dateEditor = qobject_cast<QDateTimeEdit *>(editor);
     if (dateEditor)
         model->setData(index, dateEditor->date().toString("dd/M/yyyy"));
 }