Demo/tkinter/matt/killing-window-w-wm.py

from Tkinter import *

# This file shows how to trap the killing of a window 
# when the user uses window manager menus (typ. upper left hand corner
# menu in the decoration border). 


### ******* this isn't really called -- read the comments
def my_delete_callback():
    print "whoops -- tried to delete me!"

class Test(Frame):
    def deathHandler(self, event):
	print self, "is now getting nuked. performing some save here...."

    def createWidgets(self):
	# a hello button
	self.hi_there = Button(self, {'text': 'Hello'})
	self.hi_there.pack({'side': 'left'})


    def __init__(self, master=None):
	Frame.__init__(self, master)
	Pack.config(self)
	self.createWidgets()

	###
	###  PREVENT WM kills from happening
	###

	# the docs would have you do this: 

#	self.master.protocol("WM_DELETE_WINDOW", my_delete_callback)

	# unfortunately, some window managers will not send this request to a window.
	# the "protocol" function seems incapable of trapping these "aggressive" window kills.
	# this line of code catches everything, tho. The window is deleted, but you have a chance
	# of cleaning up first.
	self.bind_all("<Destroy>", self.deathHandler)


test = Test()
test.mainloop()