[英]Tkinter with after and time.sleep
下面的python代码具有TKinter gui,它可以更新计算函数中的最新信息(该函数最后以self.after()进行调用。GUI还具有一些滑块,用户可以在其中调整参数。)这是有一个睡眠延迟的问题:代码运行良好,除了time.sleep(1)不仅阻塞了1秒钟的计算,而且还阻塞了GUI本身:每秒只能移动滑块一次然后将所有内容阻塞一秒钟,我该怎么办time.sleep(1)仅使计算功能处于睡眠状态,而使GUI本身不进入睡眠状态,我是否需要在单独的线程中运行计算功能?
import Tkinter as tk
import ttk
import time
class GUI(tk.Frame):
def __init__(self, master=None):
tk.Frame.__init__(self, master)
self.pack()
self.i=0
self.var1 = tk.StringVar()
self.var2 = tk.StringVar()
self.var3 = tk.StringVar()
self.var4 = tk.StringVar()
self.var5 = tk.StringVar()
self.var6 = tk.StringVar()
self.var7 = tk.StringVar()
tk.Label(self, textvariable=self.var1,justify='left').pack()
tk.Label(self, textvariable=self.var2).pack()
tk.Label(self, textvariable=self.var3).pack()
tk.Label(self, textvariable=self.var4).pack()
tk.Label(self, textvariable=self.var5).pack()
tk.Label(self, textvariable=self.var6).pack()
tk.Label(self, textvariable=self.var7).pack()
p1 = tk.Scale(master, from_=1, to=20, orient=tk.HORIZONTAL).pack()
p2 = tk.Scale(master, from_=1, to=20, orient=tk.HORIZONTAL).pack()
p3 = tk.Scale(master, from_=1, to=20, orient=tk.HORIZONTAL).pack()
p4 = tk.Scale(master, from_=1, to=20, orient=tk.HORIZONTAL).pack()
p5 = tk.Scale(master, from_=1, to=20, orient=tk.HORIZONTAL).pack()
self.progress = ttk.Progressbar(self, orient="horizontal",length=100, mode="determinate")
self.progress.pack()
def calculation(self):
# complex calculations that last 30 minutes in total
self.i += 1
time.sleep(1)
max=1000
self.var1.set("Value1: "+str(self.i))
self.var2.set("Value2: "+str(self.i+100))
self.var3.set("Value3: "+str(self.i+100))
self.var4.set("Value4: "+str(self.i+100))
self.var5.set("Value5: "+str(self.i+100))
self.var6.set("Value6: "+str(self.i+100))
self.var7.set("Value7: "+str(self.i+100))
self.progress["value"] = int(round(self.i*100/max))
#self.update() # no need, will be automatic as mainloop() runs
self.after(1, self.calculation)
app=GUI()
app.calculation() # start calculations
app.mainloop() # run gui
如果绝对必须使用睡眠,那么可以,该计算应在另一个线程或另一个进程中完成。
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