How to detect if mouse was clicked?

Question

I'm trying to build a short script in Python, where if the mouse is clicked, the mouse will reset to some arbitrary position (right now the middle of the screen).

I'd like this to run in the background, so it could work with other applications (most likely Chrome, or some web browser). I'd also like it so that a user could hold down a certain button (say CTRL) and they could click away and not have the position reset. This way they could close the script without frustration.

I'm pretty sure I know how to do this, but I'm not sure which library to use. I'd prefer if it was cross-platform, or at least work on Windows and Mac.

Here's my code so far:

#! python3
# resetMouse.py - resets mouse on click - usuful for students with
# cognitive disabilities.

import pymouse

width, height = m.screen_size()
midWidth = (width + 1) / 2
midHeight = (height + 1) / 2

m = PyMouse()
k = PyKeyboard()


def onClick():
    m.move(midWidth, midHeight)


try:
    while True:
        # if button is held down:
            # continue
        # onClick()
except KeyboardInterrupt:
    print('\nDone.')

Answer 1

I was able to make it work just with win32api. It works when clicking on any window.

import win32api
import time

width = win32api.GetSystemMetrics(0)
height = win32api.GetSystemMetrics(1)
midWidth = int((width + 1) / 2)
midHeight = int((height + 1) / 2)

state_left = win32api.GetKeyState(0x01)  # Left button up = 0 or 1. Button down = -127 or -128
while True:
    a = win32api.GetKeyState(0x01)
    if a != state_left:  # Button state changed
        state_left = a
        print(a)
        if a < 0:
            print('Left Button Pressed')
        else:
            print('Left Button Released')
            win32api.SetCursorPos((midWidth, midHeight))
    time.sleep(0.001)