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# spreadsheetdelegate.cpp Example File
demos/spreadsheet/spreadsheetdelegate.cpp

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     #include "spreadsheetdelegate.h"
     #include <QtGui>

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