def columnType( self ):
        """
        Returns the column type for this item based on the current column.
        
        :return     <orb.ColumnType>
        """
        schema = self.treeWidget().parent().schema()
        if ( not schema ):
            return 0
        column = schema.column(self.text(0))
        if ( column ):
            return column.columnType()
        return ColumnType.String