如何使用pygame显示基于按钮点击的不同图像？

import pygame
import sys

pygame.init()
screen = pygame.display.set_mode((800, 600))
pygame.display.set_caption("Button Demo")

class Button:
    def __init__(self, x, y, width, height, default_image, clicked_image):
        self.rect = pygame.Rect(x, y, width, height)
        self.default_image = pygame.image.load(default_image)
        self.clicked_image = pygame.image.load(clicked_image)
        self.image = self.default_image

    def draw(self):
        screen.blit(self.image, self.rect)

    def check_collision(self, pos):
        if self.rect.collidepoint(pos):
            self.image = self.clicked_image
        else:
            self.image = self.default_image

button = Button(300, 200, 200, 100, "default_image.png", "clicked_image.png")

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        elif event.type == pygame.MOUSEBUTTONDOWN:
            if event.button == 1:
                button.check_collision(event.pos)

    screen.fill((255, 255, 255))
    button.draw()
    pygame.display.flip()