我正在用Pygame＆amp; amp建立一个音乐播放器Tkinter当前正在尝试添加一个工作时间滑块，允许您通过拖动滑块跳转到歌曲中的特定点。
我将滑块末尾的值（'配置中的''）设置为当前歌曲的长度，然后使用'after'更新滑块，如下所示：
def update_timeslider(self, _ = None):
time = (pygame.mixer.music.get_pos()/1000)
timeslider.set(time)
self.after(1000, self.update_timeslider)
这适用于移动滑块以及歌曲的时间，但现在我正在尝试实现提示功能并遇到问题。我尝试使用
将歌曲位置更新为滑块的值def cue(self, _ = None):
pygame.mixer.music.set_pos(timeslider.get())
现在当我播放这首歌时，它非常不稳定。当我移动滑块时，它会在“后”功能更新之前暂时工作，但之后它会跳回到移动之前的位置。我尝试提高刷新率，但它只是让它更快地跳回来并保持不稳定。
有更好的方法吗？
完整代码：
import os
import pygame
import tkinter
from tkinter.filedialog import askdirectory
from tkinter import *
from tkinter import ttk
playlist = []
index = 0
paused = False
class Application(tkinter.Tk):
def __init__(self, parent):
tkinter.Tk.__init__(self, parent)
self.minsize(400,400)
self.parent = parent
self.main()
def main(self):
global v
global songlabel
global listbox
global volumeslider
global timeslider
global time_elapsed
global songlength
self.configure(background='grey')
self.grid()
self.listbox = Listbox(self, width=20, height=25, relief='ridge', bd=3)
self.listbox.grid(padx=30, pady=15, row=1, columnspan=11, sticky='NSEW')
v = StringVar()
songlabel = tkinter.Label(self, textvariable=v, width=30, anchor="n")
rewbtn = PhotoImage(file="rew.gif")
stopbtn = PhotoImage(file="stop.gif")
playbtn = PhotoImage(file="play.gif")
pausebtn = PhotoImage(file="pause.gif")
ffbtn = PhotoImage(file="ff.gif")
prevbutton = Button(self, width=30, height=30, image=rewbtn, anchor='w')
prevbutton.image = rewbtn
prevbutton.bind("<Button-1>", self.prevsong)
prevbutton.grid(row=10, column=0, padx=(30,0), sticky='w')
playbutton = Button(self, width=30, height=30, image=playbtn, anchor='w')
playbutton.image = playbtn
playbutton.bind("<Button-1>", self.play)
playbutton.grid(row=10, column=1, sticky='w')
pausebutton = Button(self, width=30, height=30, image=pausebtn, anchor='w')
pausebutton.image = pausebtn
pausebutton.bind("<Button-1>", self.pause)
pausebutton.grid(row=10, column=2, sticky='w')
stopbutton = Button(self, width=30, height=30, image=stopbtn, anchor='w')
stopbutton.image = stopbtn
stopbutton.bind("<Button-1>", self.stop)
stopbutton.grid(row=10, column=3, sticky='w')
nextbutton = Button(self, width=30, height=30, image=ffbtn, anchor='w')
nextbutton.image = ffbtn
nextbutton.bind("<Button-1>", self.nextsong)
nextbutton.grid(row=10, column=4, sticky='w')
volumeslider = Scale(self, from_=0, to = 1, resolution = 0.01, orient = HORIZONTAL, showvalue = 'yes', command = self.change_vol)
volumeslider.grid(row=10, column=8, columnspan=3, padx=30, pady=(0,10), sticky='wse')
volumeslider.set(50)
timeslider = Scale(self, from_=0, to=100, resolution=1, orient=HORIZONTAL, showvalue = 'no', command=self.cue)
timeslider.grid(row=12, column=0, columnspan=11, padx = 30, sticky='wse')
timeslider.set(0)
time_elapsed = Label(text="0:00:00")
time_elapsed.grid(row=13, columnspan=11, padx=(30,0), pady=(0,30), sticky='ws')
# time_remaining = Label(text="0:00:00")
# time_remaining.grid(row=13, column = 7, columnspan=5, padx=(0,30), pady=(0,30), sticky='se')
# FILE OPEN
self.directorychooser()
playlist.reverse()
for items in playlist:
self.listbox.insert(0, items)
playlist.reverse()
self.listbox.bind("<Double-Button-1>", self.selectsong)
self.listbox.bind("<Return>", self.selectsong)
songlabel.grid(row = 0, column = 0, columnspan = 10, padx = 55, pady=(10,0), sticky=W+N+E)
# GRID WEIGHT
self.grid_columnconfigure(5,weight=1)
self.grid_columnconfigure(7,weight=1)
self.grid_rowconfigure(1,weight=1)
def prevsong(self, event):
global index
if index > 0:
index-=1
print(index)
elif index == 0:
index = len(playlist)-1
pygame.mixer.music.load(playlist[index])
self.set_timescale()
pygame.mixer.music.play()
self.get_time_elapsed()
self.update_timeslider()
self.update_currentsong()
def play(self, event):
self.set_timescale()
pygame.mixer.music.play()
self.get_time_elapsed()
self.update_timeslider()
self.update_currentsong()
def pause(self, event):
global paused
if paused == True:
pygame.mixer.music.unpause()
paused = False
elif paused == False:
pygame.mixer.music.pause()
paused = True
def nextsong(self, event):
global index
if index < len(playlist)-1:
index+=1
elif index == (len(playlist)-1):
index = 0
pygame.mixer.music.load(playlist[index])
self.set_timescale()
pygame.mixer.music.play()
self.get_time_elapsed()
self.update_timeslider()
self.update_currentsong()
def stop(self, event):
pygame.mixer.music.stop()
v.set("")
return songlabel
def selectsong(self, event):
global index
global songtime
global songlength
idx = self.listbox.curselection()
index = idx[0]
pygame.mixer.music.load(playlist[index])
self.set_timescale()
pygame.mixer.music.play()
self.get_time_elapsed()
# self.get_time_remaining()
self.update_timeslider()
self.update_currentsong()
def change_vol(self, _ = None):
pygame.mixer.music.set_volume(volumeslider.get())
def cue(self, _ = None):
pygame.mixer.music.set_pos(timeslider.get())
def getsonglen(self):
s = pygame.mixer.Sound(playlist[index])
songlength = s.get_length()
return songlength
def set_timescale(self):
songlength = self.getsonglen()
timeslider.config(to=songlength)
def get_time_elapsed(self):
global time_elapsed
time = int(pygame.mixer.music.get_pos()/1000)
m, s = divmod(time, 60)
h, m = divmod(m, 60)
clock = "%d:%02d:%02d" % (h, m, s)
time_elapsed.configure(text=clock)
self.after(100, self.get_time_elapsed)
# def get_time_remaining(self):
# global time_remaining
# time = int(pygame.mixer.music.get_pos()/1000)
# songlen = int(self.getsonglen())
# rem = songlen - time
# m, s = divmod(rem, 60)
# h, m = divmod(m, 60)
# clock2 = "%d:%02d:%02d" % (h, m, s)
# time_remaining.configure(text=clock2)
# self.after(100, self.get_time_remaining)
def update_timeslider(self, _ = None):
time = (pygame.mixer.music.get_pos()/1000)
timeslider.set(time)
self.after(10, self.update_timeslider)
def update_currentsong(self):
global index
global songlabel
v.set(playlist[index])
return songlabel
def directorychooser(self):
directory = askdirectory()
os.chdir(directory)
for files in os.listdir(directory):
if files.endswith(".flac"):
realdir = os.path.realpath(files)
playlist.append(files)
print(files)
pygame.mixer.init()
pygame.mixer.music.load(playlist[0])
self.update_currentsong()
app = Application(None)
app.mainloop()
答案 0 :(得分：3)
问题似乎是update_timeslider被调用的次数比你想象的要多。
执行此操作时：
self.update_timeslider()
...它导致self.update_timeslider每秒被调用100次。
问题是你从代码中的多个地方调用它，这意味着你最终可能每秒调用该函数500-1000次甚至更多。如果每次调用都需要很长一段时间，那么更新滑块的时间会比播放声音的时间长。
当您致电after时，它会返回一个ID。您可以使用此ID稍后在开始新循环之前取消任何现有呼叫。例如，您可能希望执行以下操作：
class Application(tkinter.Tk):
def __init__(self, parent):
...
self.after_id = None
def update_timeslider(self, _ = None):
if self.after_id is not None:
self.after_cancel(self.after_id)
self.after_id = None
time = (pygame.mixer.music.get_pos()/1000)
timeslider.set(time)
self.after_id = self.after(1000, self.update_timeslider)