当你删除文本时，如何在pygame中缩小文本框？

import pygame
from pygame import font

pygame.init()
window = pygame.display.set_mode((800, 600))

text_box_width = 200
text_box_height = 50
font_size = 30

font_obj = pygame.font.Font(None, font_size)

text_surface = pygame.Surface((text_box_width, text_box_height))
text_rect = pygame.Rect(100, 100, text_box_width, text_box_height)
pygame.draw.rect(text_surface, (255, 255, 255), text_rect)

while True:
    for event in pygame.event.get():
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_BACKSPACE:
                # 用户按下了删除键
                text_box_width -= 10  # 缩小文本框的宽度
                text_box_height -= 10  # 缩小文本框的高度

    # 重新绘制文本框
    text_surface = pygame.Surface((text_box_width, text_box_height))
    text_rect = pygame.Rect(100, 100, text_box_width, text_box_height)
    pygame.draw.rect(text_surface, (255, 255, 255), text_rect)

    # 更新窗口显示
    window.blit(text_surface, (100, 100))
    pygame.display.update()