Emits the sorting changed signal if the user clicks on a sorting
        column.
        
        :param      index | <int>

def emitSortingChanged( self, index ):
        """
        Emits the sorting changed signal if the user clicks on a sorting
        column.
        
        :param      index | <int>
        """
        if not self.signalsBlocked() and self.isSortingEnabled():
            self.sortingChanged.emit(index, self.header().sortIndicatorOrder())