FontSelect: A Tkinter widget to select fonts

This method changes self's family name.

    def setFamily ( self, newFamily ):
        """Sets self's font family name.
        """
        #-- 1 --
        self.__currentFamily  =  newFamily

        #-- 2 --
        # [ if self's controls describe a valid font ->
        #     self  :=  self displaying that new font
        #     call self's observers with that new font
        #   else ->
        #     pop up an error dialog ]
        self.__setFont()