use aio green thread for pygame.time.set_timer

patch_set_timer

import asyncio
import itertools

import pygame


import aio.gthread

from threading import Thread

def patch_set_timer(cust_event_no, millis, loops=0):
    dlay = float(millis) / 1000
    cevent = pygame.event.Event(cust_event_no)
    async def fire_event():
        while not aio.exit:
            await asyncio.sleep( dlay )
            pygame.event.post(cevent)
    Thread(target=fire_event).start()

pygame.time.set_timer = patch_set_timer


WIDTH, HEIGHT = 500, 400
FPS = 60
COLOR_CHANGE_EVENT = pygame.event.custom_type()
COLOR_CYCLE = itertools.cycle(pygame.color.THECOLORS.keys())


async def main():
    pygame.init()
    screen = pygame.display.set_mode((WIDTH, HEIGHT))
    clock = pygame.time.Clock()

    pygame.time.set_timer(COLOR_CHANGE_EVENT, 500, 0)
    bg_color = next(COLOR_CYCLE)

    running = True
    while running:
        clock.tick(FPS)
        screen.fill(bg_color)

        events = pygame.event.get()
        for event in events:
            if event.type == pygame.QUIT:
                running = False
            if event.type == COLOR_CHANGE_EVENT:
                bg_color = next(COLOR_CYCLE)

        pygame.display.flip()
        await asyncio.sleep(0)


def run():
    asyncio.run(main())


if __name__ == "__main__":
    run()