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

1.sound_panel模块

from tkinter import *
import pygame.mixer

class 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.mixer
import os            #与操作系统相关的模块

app = Tk()
app.title("Head Firs Mix2")

mixer = pygame.mixer
mixer.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：