How to bind Alt-F4 with Python tkinter?

Question

I am building a GUI application using Python and Tkinter. I want to control the behavior of the program when the user closes it.

I've installed a new WM_DELETE_WINDOW protocol using:

root = Tk()
root.protocol("WM_DELETE_WINDOW", lambda: closes_gracefully())

This indeed is working when the user clicks the X button on the titlebar, but it is NOT working when the user presses ALT+F4.

I tried binding the key sequence: root.bind("<Alt-F4>", lambda: closes_gracefully()) but it did not work.

How can I capture the ALT+F4 event?

lambda: closes_gracefully() is just closes_gracefully, by the way. — TigerhawkT3
– TigerhawkT3, Commented Jan 24, 2017 at 8:28
Just tried in my app and this works well for me: self.bind('<Alt-Key-F4>', self.whatever_your_want) — CommonSense
– CommonSense, Commented Jan 24, 2017 at 8:29
Your current code works fine for me. Please add a minimal reproducible example. — TigerhawkT3
– TigerhawkT3, Commented Jan 24, 2017 at 8:34
Just a note: Alt+F4 is platform dependent, for example Macs use Cmd+Q / Cmd+W. — Melebius
– Melebius, Commented Jan 24, 2017 at 9:41

Zachary Espiritu · Accepted Answer · 2017-08-26 21:31:52Z

3

For this purpose, you could use atexit.register.

It works like a stack that is executed when the program gets closed. Every time you do register(function), this function gets pushed on top. If you added a, b and c they get executed in the opposite order(c, b, a).

In your case, you should do:

register(closes_gracefully)

You should note that this works almost always, except with crashes(alt-f4 works too, just tested it).

You can even use register as a decorator when the function takes no parameters:

@register
def bye():
    print("I'm out!")

edited Aug 26, 2017 at 21:31

Zachary Espiritu

9878 silver badges24 bronze badges

answered Aug 26, 2017 at 21:05

r0w

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