Overriding Tkinter "X" button control (the button that close the window) [duplicate]

It sounds as if your save window should be modal.

If this is a basic save window, why are you reinventing the wheel?Tk has a tkFileDialog for this purpose.

If what you want is to override the default behaviour of destroying the window, you can simply do:

root.protocol('WM_DELETE_WINDOW', doSomething)  # root is your root windowdef doSomething():    # check if saving    # if not:    root.destroy()

This way, you can intercept the destroy() call when someone closes the window (by any means) and do what you like.

Using the method procotol, we can redefine the WM_DELETE_WINDOW protocol by associating with it the call to a function, in this case the function is called on_exit:

import tkinter as tkfrom tkinter import messageboxclass App(tk.Tk):    def __init__(self):        tk.Tk.__init__(self)        self.title("Handling WM_DELETE_WINDOW protocol")        self.geometry("500x300+500+200")        self.make_topmost()        self.protocol("WM_DELETE_WINDOW", self.on_exit)    def on_exit(self):        """When you click to exit, this function is called"""        if messagebox.askyesno("Exit", "Do you want to quit the application?"):            self.destroy()    def center(self):        """Centers this Tk window"""        self.eval('tk::PlaceWindow %s center' % app.winfo_pathname(app.winfo_id()))    def make_topmost(self):        """Makes this window the topmost window"""        self.lift()        self.attributes("-topmost", 1)        self.attributes("-topmost", 0)if __name__ == '__main__':    App().mainloop()

The command you are looking for is wm_protocol, giving it "WM_DELETE_WINDOW" as the protocol to bind to. It lets you define a procedure to call when the window manager closes the window (which is what happens when you click the [x]).