virtual QMimeData *mimeData(const QModelIndexList &) const;
virtual bool dropMimeData(const QMimeData *, Qt::DropAction, int, int, const QModelIndex &);
virtual QMimeData *mimeData(const QModelIndexList &) const;
virtual bool dropMimeData(const QMimeData *, Qt::DropAction, int, int, const QModelIndex &);