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6.2. FamilyPicker._listboxHandler()

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 --