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#!/usr/bin/python

# Python 2/3 compatibility.

from __future__ import print_function

import sys

import os

# Change path so we find Xlib

sys.path.append(os.path.join(os.path.dirname(__file__), '..'))

from Xlib import display, X, threaded

import time

import thread

def redraw(win, gc):

# win.clear_area()

win.fill_rectangle(gc, 20, 20, 60, 60)

def blink(display, win, gc, cols):

while 1:

time.sleep(2)

print('Changing color', cols[0])

gc.change(foreground = cols[0])

cols = (cols[1], cols[0])

redraw(win, gc)

display.flush()

def main():

d = display.Display()

root = d.screen().root

colormap = d.screen().default_colormap

red = colormap.alloc_named_color("red").pixel

blue = colormap.alloc_named_color("blue").pixel

background = colormap.alloc_named_color("white").pixel

window = root.create_window(100, 100, 100, 100, 1,

X.CopyFromParent, X.InputOutput,

X.CopyFromParent,

background_pixel = background,

event_mask = X.StructureNotifyMask | X.ExposureMask)

window.map()

gc = window.create_gc(foreground = red)

thread.start_new_thread(blink, (d, window, gc, (blue, red)))

while 1:

event = d.next_event()

if event.type == X.Expose:

if event.count == 0:

redraw(window, gc)

elif event.type == X.DestroyNotify:

sys.exit(0)

if __name__ == "__main__":

main()