def METHOD_NAME(self, w: Gtk.MenuToolButton):
    dialog = Gtk.FileChooserNative.new(
        _("Export font in folder..."),
        MainController.window(),
        Gtk.FileChooserAction.SELECT_FOLDER,
        _('_Save'), None
    )
    response = dialog.run()
    fn = dialog.get_filename()
    dialog.destroy()
    if response == Gtk.ResponseType.ACCEPT:
        assert self.font
        for i in range(self.font.get_nb_entries()):
            e = self.font.get_entry(i)
            if e:
                path = os.path.join(fn, f'{i:0>4}.png')
                e.save(path)