override_redirect focus test

window.py

#!/usr/bin/python2

# How to test:
#
# 1. Minimize all windows belonging to the VM, except for one terminal.
# 2. Run "sleep 10; ./window.py" in the terminal.
# 3. Focus a window from another VM before the popup appears.
# 4. Move the pointer to the popup without travelling through the terminal.
# 5. Click on the popup.
#
# The popup window will receive mouse clicks, but no keyboard input.


import xcb
from xcb.xproto import *

override_redirect = True
#override_redirect = False

conn   = xcb.connect()
root   = conn.get_setup().roots[0]
window = conn.generate_id()

conn.core.CreateWindow(root.root_depth, window, root.root, 0, 0, 234, 234, 0,
                       WindowClass.InputOutput, root.root_visual,
                       CW.BackPixel | CW.OverrideRedirect | CW.EventMask,
                       [
                         root.white_pixel,
                         override_redirect,
                         2**25 - 1  # subscribe to all events
                       ])
conn.core.MapWindow(window)

#conn.core.SetInputFocus(InputFocus._None, window, Time.CurrentTime)
conn.core.GrabKeyboard(True, root.root, Time.CurrentTime,
                       GrabMode.Async, GrabMode.Async)
conn.flush()

while True:
        event = conn.wait_for_event()
        print(event.__class__.__name__)

        # exit on middle mouse button, Escape key, or WM_DELETE_WINDOW
        if (isinstance(event, ButtonPressEvent)   and event.detail == 2) or \
           (isinstance(event, KeyPressEvent)      and event.detail == 9) or \
           (isinstance(event, ClientMessageEvent) and event.data.data32[0] == 240):
            exit(0)