FontSelect: A Tkinter widget to select fonts

This method is called whenever the user clicks in the family names list. When called, it calls the observer function and passes the font name to it.

    def __listboxHandler ( self, lineNo ):
        """Handler for selection in the listbox.
        """

First we need to translate the line number in the list box into a family name. Then we pass that to our observer callback.

        #-- 1 --
        # [ familyName  :=  text from the (lineNo)th line of
        #       self.scrollList ]
        familyName  =  self.scrollList[lineNo]

        #-- 2 --
        self.observer ( familyName )