如何冻结pygame窗口？

import pygame

pygame.init()

# 设置窗口尺寸
window_width = 800
window_height = 600
window_size = (window_width, window_height)

# 创建窗口
window = pygame.display.set_mode(window_size)
pygame.display.set_caption("My Game")

# 游戏循环控制变量
running = True
paused = False

while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                paused = not paused  # 切换暂停状态

    if not paused:
        # 游戏逻辑和绘制
        # ...

    pygame.display.flip()

pygame.quit()