《Head First Programming》---python 10_GUI Mixer2

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1.sound_panel模块

from tkinter import *import pygame.mixerclass SoundPanel(Frame):    def __init__(self, app, mixer, sound_file):        Frame.__init__(self, app)              #这里用到了tkinter的Frame        self.track = mixer.Sound(sound_file)        self.track_playing = IntVar()        track_button = Checkbutton(self,                                   variable = self.track_playing,                                   command = self.track_toggle,                                   text = sound_file                                   )        track_button.pack(side = LEFT)        self.volume = DoubleVar()        self.volume.set(self.track.get_volume())        volume_scale = Scale(self,                             variable = self.volume,                             from_ = 0.0,                             to = 1.0,                             resolution = 0.1,                             command = self.change_volume,                             label = 'Volume',                             orient = HORIZONTAL                             )        volume_scale.pack(side = RIGHT)    def track_toggle(self):        if self.track_playing.get() == 1:#囧,刚开始.get()未写一直没有声音            self.track.play(loops = -1)  #循环播放至结束        else:            self.track.stop()        def change_volume(self, v):        self.track.set_volume(self.volume.get())

2.hfmix主程序

from tkinter import *from sound_panel import *import pygame.mixerimport os            #与操作系统相关的模块app = Tk()app.title("Head Firs Mix2")mixer = pygame.mixermixer.init()dirList = os.listdir(".")for fname in dirList:    if fname.endswith(".wav"):        panel = SoundPanel(app, mixer, fname)        panel.pack()def shutdown():    mixer.stop()#书中这里有问题的，改正为mixer    app.destroy()app.protocol("WM_DELETE_WINDOW", shutdown)app.mainloop()

3.运行截图：

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