Re: [Tutor] Event handler for optionmenu

Mon, 15 Aug 2005 02:42:34 -0700

Jorge Louis De Castro napsal(a):
Hi,
 
I have an optionmenu widget that works just fine except that  can't find docs to get hold of events as they happen, kinda like the command=XYZ of other widgets like buttons.
 
The code I'm using for the option menu is the following:
 
OPTIONS = ["en","pt","es","it","fr","de"]
self.startw.variable = StringVar()
self.startw.variable.set(OPTIONS[0]) # default value
self.startw.whis_butt=apply(OptionMenu, (self.startw, self.startw.variable) + tuple(OPTIONS))
self.startw.whis_butt.grid(column=1, row=3)
 
Now I'd like to have a function like:
 
def onChange(self):
     # do optionmenu specific stuff
 
but can't find how to do it, how to associate/bind onChange with the optionmenu widget.
Any help will be highly appreciated.
 
This art is called Trace Variable and could be used like this (copied and rearranged from one of the prevously posted message from here):

from Tkinter import *

OPTIONS = [
    "egg",
    "bunny",
    "chicken"
]

def callbackFunc(name, index, mode):
  #print "callback called with name=%r, index=%r, mode=%r" % (name, index, mode)
  varValue = root.getvar(name)
  print varValue
  # modify the value, just to show it can be done
  #root.setvar(name, varValue)

root = Tk()
var = StringVar()
var.set(OPTIONS[2]) # default value
rememberMe = var.trace_variable('w', callbackFunc)  
# var.trace('w', callbackFunc) # this works, too



w = OptionMenu (root, var, *OPTIONS)
w.pack()


root.mainloop()

Hope its what you asked for :-)
-- 
geon





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