#!/usr/bin/env python3

import tkinter as tk


def release_and_exit(event=None):
    try:
        root.grab_release()
    except tk.TclError:
        # The XKB grab-breaking action may already have released the grab.
        pass
    root.destroy()


def grab_mouse():
    root.grab_set_global()
    status.config(text="Mouse grabbed. Test the XKB ungrab action.")
    grab_button.config(state=tk.DISABLED)


root = tk.Tk()
root.title("Mouse Grab Test")
root.geometry("420x140")
root.protocol("WM_DELETE_WINDOW", release_and_exit)
root.bind("<Escape>", release_and_exit)

status = tk.Label(
    root,
    text="Click the button to globally grab the mouse.",
    padx=20,
    pady=20,
)
status.pack()

grab_button = tk.Button(root, text="Grab mouse", command=grab_mouse)
grab_button.pack()

tk.Label(root, text="Press Escape to release the grab and exit.").pack(pady=10)

root.mainloop()