variantdelegate.h Example File
tools/settingseditor/variantdelegate.h

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 #ifndef VARIANTDELEGATE_H
 #define VARIANTDELEGATE_H

 #include <QItemDelegate>
 #include <QRegExp>

 class VariantDelegate : public QItemDelegate
 {
     Q_OBJECT

 public:
     VariantDelegate(QObject *parent = 0);

     void paint(QPainter *painter, const QStyleOptionViewItem &option,
                const QModelIndex &index) const;
     QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                           const QModelIndex &index) const;
     void setEditorData(QWidget *editor, const QModelIndex &index) const;
     void setModelData(QWidget *editor, QAbstractItemModel *model,
                       const QModelIndex &index) const;

     static bool isSupportedType(QVariant::Type type);
     static QString displayText(const QVariant &value);

 private:
     mutable QRegExp boolExp;
     mutable QRegExp byteArrayExp;
     mutable QRegExp charExp;
     mutable QRegExp colorExp;
     mutable QRegExp dateExp;
     mutable QRegExp dateTimeExp;
     mutable QRegExp doubleExp;
     mutable QRegExp pointExp;
     mutable QRegExp rectExp;
     mutable QRegExp signedIntegerExp;
     mutable QRegExp sizeExp;
     mutable QRegExp timeExp;
     mutable QRegExp unsignedIntegerExp;
 };

 #endif