cpython/Lib/idlelib/dynoption.py

"""
OptionMenu widget modified to allow dynamic menu reconfiguration
and setting of highlightthickness
"""
from tkinter import OptionMenu, _setit, StringVar, Button

class DynOptionMenu(OptionMenu):
    """Add SetMenu and highlightthickness to OptionMenu.

    Highlightthickness adds space around menu button.
    """
    def __init__(self, master, variable, value, *values, **kwargs):
        highlightthickness = kwargs.pop('highlightthickness', None)
        OptionMenu.__init__(self, master, variable, value, *values, **kwargs)
        self['highlightthickness'] = highlightthickness
        self.variable = variable
        self.command = kwargs.get('command')

    def SetMenu(self,valueList,value=None):
        """
        clear and reload the menu with a new set of options.
        valueList - list of new options
        value - initial value to set the optionmenu's menubutton to
        """
        self['menu'].delete(0,'end')
        for item in valueList:
            self['menu'].add_command(label=item,
                    command=_setit(self.variable,item,self.command))
        if value:
            self.variable.set(value)

def _dyn_option_menu(parent):  # htest #
    from tkinter import Toplevel # + StringVar, Button

    top = Toplevel(parent)
    top.title("Test dynamic option menu")
    x, y = map(int, parent.geometry().split('+')[1:])
    top.geometry("200x100+%d+%d" % (x + 250, y + 175))
    top.focus_set()

    var = StringVar(top)
    var.set("Old option set") #Set the default value
    dyn = DynOptionMenu(top, var, "old1","old2","old3","old4",
                        highlightthickness=5)
    dyn.pack()

    def update():
        dyn.SetMenu(["new1","new2","new3","new4"], value="new option set")
    button = Button(top, text="Change option set", command=update)
    button.pack()

if __name__ == '__main__':
    # Only module without unittests because of intention to replace.
    from idlelib.idle_test.htest import run
    run(_dyn_option_menu)