Tkinter's OptionMenu

[johngrayson at home.com]

In article <ZiYL4.110745$8S2.1383832 at news1.rdc1.tn.home.com>,
  "Mike Callahan" <mcalla at home.com> wrote:
> How does one change an OptionMenu widget's list? I know that you can
do this
> easily using the PMW widget, but I would like to stay with basic
Tkinter
> widgets to keep the code as small as possible. I could not find any
methods
> in the code and I could not find any examples in either the online
> documentation or the new book on Tkinter.
>
>

I didn't expand on Tkinter's OptionMenu class too much in _Python and
Tkinter Programming_, since using Pmw's version is usually more
convenient. The problem is that you really have to 'roll your own'
to do much with the vanilla widget.

However, if you insist, here is some sample code to manipulate
Tkinter's OptionMenu:

from Tkinter import *
root = Tk()
root.title('OptionMenu')

class setit:
	def __init__(self, var, value):
		self.__value = value
		self.__var = var
	def __call__(self, *args):
		self.__var.set(self.__value)

class OptionM:
    def __init__(self,parent):

        self.var = StringVar()
        self.var.set('BRM')

        self.opt_menu = OptionMenu(parent, self.var, 'Stockbroker',
                                   'Quantity Surveyor', 'Church Warden',
                                   'BRM' )
        self.opt_menu.pack(anchor=W, padx=20, pady=30)

        Button(parent, text='Add item', command=self.addItem).pack()

        Button(parent, text='Change items',
               command=self.changeItems).pack()

    def addItem(self):
        self.opt_menu["menu"].add_command(label='Dinsdale',
                                  command=setit(self.var, 'Dinsdale'))

    def changeItems(self):
        self.opt_menu["menu"].delete(0, END)
        for item in ['Passion fruit','Loganberries','Mangoes in syrup',
                      'Oranges','Apples','Grapefruit']:
            self.opt_menu["menu"].add_command(label=item,
                                      command=setit(self.var, item))
        self.var.set('Loganberries')

om = OptionM(root)
root.mainloop()

A bit crude, but it's a start. Use Pmw if you can!

    John


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