How to run a function after a tkinter window is loaded

Question

If I have a function called do_stuff(), how do I execute it AFTER a tkinter window named root finishes loading.

https://stackoverflow.com/questions/25753632/tkinter-how-to-use-after-method You can execute any method after some time. — Piotr Wasilewicz, Mar 23 '18 at 06:26
While `after` is a viable option, it's worth to notice, that [`Map/Unmap`](http://tcl.tk/man/tcl8.5/TkCmd/bind.htm#M13) event is another option. — CommonSense, Mar 23 '18 at 07:37
Have you done any research before asking this question? See [How much research effort is expected of Stack Overflow users?](http://meta.stackoverflow.com/q/261592/7432) — Bryan Oakley, Mar 23 '18 at 11:55

score 1 · Answer 1 · answered Oct 23 '20 at 05:53

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Similar to the <Map> event, the <Visibility> event is triggered whenever the window/widget becomes visible. By unbinding in the callback, we can make sure the callback is only called once when the window becomes visible.

def callback():
    # your code here
    root.unbind('<Visibility>') # only call `callback` the first time `root` becomes visible

root.bind('<Visibility>', callback) # call `callback` whenever `root` becomes visible

answered Oct 23 '20 at 05:53

Christian Reall-Fluharty

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While `` probably is better for some purposes, I was trying to center the window, and the geometry didn't seem finalized by the time `` was triggered, so `` was the next best option – Christian Reall-Fluharty Oct 23 '20 at 05:56

score -1 · Answer 2 · answered Mar 24 '18 at 20:31

-1

When a window is placed on screen in X Windows is has been mapped so the Tk <Map> event is raised to let your application know that this window is now created and on-screen. If you only want to handle this once after creation then delete your binding the first time your receive the event as it is sent each time the window is re-mapped on screen. ie: minimize and restore events.

answered Mar 24 '18 at 20:31

patthoyts

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umm... How again? – Person Mar 25 '18 at 02:35
The question asked about fully loaded window aka all inner widgets are loaded as well. is triggered earlier. You can check it by updating the window geometry and then binding window to print(window.geometry()). The reported value will differ from the required one. – Andrey Dec 08 '22 at 16:45

How to run a function after a tkinter window is loaded

2 Answers2