# tk_xy_outside_gui.py

# tk_xy_outside_gui.py

import tkinter as tk
import ctypes
import time

ww = 300
hh = 300

cx = 0
cy = 0

root = tk.Tk()
canvas = tk.Canvas(root, width=ww, height=hh, bg='darkgreen')
canvas.pack()

# Define ctypes structures and functions
class POINT(ctypes.Structure):
    _fields_ = [("x", ctypes.c_long), ("y", ctypes.c_long)]

def get_xy():
    point = POINT()
    ctypes.windll.user32.GetCursorPos(ctypes.byref(point))
    return point.x, point.y

def gui_update(event):
    global cx, cy, cw, ch
    # get the root position and height
    cx = root.winfo_x()
    cy = root.winfo_y()
    cw = root.winfo_width()
    ch = root.winfo_height()
gui_update(0)

root.bind("<Configure>", gui_update)

out = 50
while 1:
    x, y = get_xy()
    x = (x - cx)
    y = (y - cy)

    if -out > x or x > cw + out or -out > y or y > ch + out + 20:
        canvas.config(bg='darkred')
    else:
        canvas.config(bg='darkgreen')

    canvas.update()