Override Alt-f4 Closing Tkinter Window In Python 3.6 And Replace It With Something Else

I spent a long time reading through past posts and didn't find quite what I need. I'm making a kiosk-type window using tkinter. I set it to open fullscreen. I want to override the

Solution 1:

There is a way to hook the Alt+F4 or pressing the X or any other way as far as I know:

root.protocol("WM_DELETE_WINDOW", do_exit)

where do_exit() is the callback function and root is your main window.

This binding does not pass an event object. As far as I can see this should work for any platform.

Here is an example:

from tkinter import *

root = Tk()

pressed_f4 = False# Is Alt-F4 pressed?defdo_exit():
    global pressed_f4
    print('Trying to close application')
    if pressed_f4:  # Deny if Alt-F4 is pressedprint('Denied!')
        pressed_f4 = False# Reset variableelse:
        close()     # Exit applicationdefalt_f4(event):  # Alt-F4 is pressedglobal pressed_f4
    print('Alt-F4 pressed')
    pressed_f4 = Truedefclose(*event):  # Exit application
    root.destroy()

root.bind('<Alt-F4>', alt_f4)
root.bind('<Escape>', close)
root.protocol("WM_DELETE_WINDOW",do_exit)

root.mainloop()

I'm not sure that the callback from root.bind('<Alt-F4>', alt_f4) always will run before the callback from root.protocol("WM_DELETE_WINDOW",do_exit). You may have to do more research to establish that.