import pygame
from pygame import locals

pygame.init()   # 初始化
# 创建窗口
screen = pygame.display.set_mode((640, 480))
# 载入图片、资源
bg_img = pygame.image.load('background.png')  # 背景图
play_img = pygame.image.load('play.png')  # 播放按钮
stop_img = pygame.image.load('stop.png')  # 暂停按钮
last_img = pygame.image.load('last.png')  # 上一曲按钮
next_img = pygame.image.load('next.png')  # 下一曲按钮
logo_img = pygame.image.load('logo.png') # 中间logo
pygame.mixer.music.load('10.ogg')
play_button = stop_img

pygame.mixer.music.play()

vol = 0.2
click = 1
pygame.mixer.music.set_volume(vol)
while True:
    for event in pygame.event.get():
        if event.type == locals.QUIT:
            # 接收到退出事件后退出程序
            exit()
        if event.type == locals.KEYDOWN:
            if event.key == locals.K_UP:
                vol += 0.1
                if vol > 1:
                   vol = 1 
                pygame.mixer.music.set_volume(vol)
            if event.key == locals.K_DOWN:
                vol -= 0.1
                if vol < 0:
                   vol = 0 
                pygame.mixer.music.set_volume(vol)    
        if event.type == locals.MOUSEBUTTONDOWN:
                click += 1
                if click % 2 == 0:
                    pygame.mixer.music.unpause()
                    play_button = stop_img
                else:
                    pygame.mixer.music.pause()
                    play_button = play_img             

    if pygame.mixer.music.get_busy() == False:
        pygame.mixer.music.play()

    # 绘制画面
    screen.blit(bg_img, (0, 0))      # 填充背景
    screen.blit(play_button, (270, 330))   # 暂停按钮
    screen.blit(logo_img, (170, 60))    # 中间logo图
    screen.blit(last_img, (120, 350))   # 上一曲
    screen.blit(next_img, (420, 350))   # 下一曲
    # 刷新画面
    pygame.display.update()