the window close event, not run in a window without the window manager?

Question

I am trying to execute a function with the closing event: self.toplevel_1.protocol ('WM_DELETE_WINDOW', lambda: self.close_windows (3)) but it does not execute, I have thought that it has to do with the window manager since it I have removed and I have an independent closing button, I have looked for some other closing event for windows without the window manager but I can't find it, I would like to know if there is any closing event for this case, thank you very much.

def windows_open(self):
    self.Toplevel_3 = Toplevel(self)
    #self.toplevel_3 .protocol('WM_DELETE_WINDOW',
                     lambda: self.close_windows(3))  # ancient
    self.toplevel_STUF.bind('<Destroy>',lambda e: self.close_windows(3))

def close_windows((self,  number, event=None):
    var = event.widget()
    if number is 3:
        if var is:    # How `var` gives an error, I don't know what it returns, here I stay 
            self.toplevel_3. destroy()
            self._open_3 = False
    #.....

In close_windows() function, does self.toplevel_3.quit() work instead of self.toplevel_3.destroy()? — IJ_123
– IJ_123, Commented Sep 29, 2021 at 4:38

Bryan Oakley · Accepted Answer · 2021-09-28 15:06:16Z

1

The WM_DELETE_WINDOW protocol and other protocols are specifically related to window manager protocols. If you don't have a window manager, they don't apply.

From the protocol man page:

This command is used to manage window manager protocols...

In the absence of a window manager, you can bind to the <Destroy> event which should fire whether you have a window manager or not. You have to be careful with this if you bind to the root window. Bindings on the root widget or a Toplevel will apply to all descendant widgets, so in the bound function you'll want to run code only if event.widget refers to the root or Toplevel window.

answered Sep 28, 2021 at 15:06

Bryan Oakley

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1 Comment

Thingamabobs Over a year ago

In addition I would share my experience that the function that is bind to destroy of the root window event shouldn't be a long run, otherwise it throws an error.

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