Tkinter:调用函数时更新进度条 [英] Tkinter: Updating progressbar when a function is called

问题描述

想象下面的简单例子:

def doNothing():
  sleep(0.5)
  barVar.set(10)
  sleep(0.5)
  barVar.set(20)
  sleep(0.5)
  barVar.set(30)

mainWindow = Tk()
barVar = DoubleVar()
barVar.set(0)
bar = Progressbar(mainWindow, length=200, style='black.Horizontal.TProgressbar', variable=barVar, mode='determinate')
bar.grid(row=1, column=0)
button= Button(mainWindow, text='Click', command=doNothing)
button.grid(row=0, column=0)
mainWindow.mainloop()

我得到了什么 当我运行这个时，点击按钮时进度条已经在 30%，我面前没有进度.如附件:

What I get when I run this, the progressbar is already at 30% when clicking the button, no progress in front of me. Like attached:

我需要什么: 我可以看到我面前的进度(不挂然后突然30%)

What I need: I can see the progress in front of me (not hanging then suddenly 30%)

更新:我根据@Bernhard 的回答更新了代码，但我仍然看不到我面前的进度.等了 1.5 秒后突然跳了 30%

Update: I upadted the code according to @Bernhard answer, but still I can not see the progress in front of me. Just a sudden jump of 30% after waiting 1.5 sec

第二次更新:我在这里仅使用 sleep 来模拟需要时间的过程，例如通过 ssh 连接并获取一些信息.

Seocnd Update: I'm only using sleep here as a simulation for a process that takes time, like connecting over ssh and grabing some info.

推荐答案

我想我找到了解决方案.

I think I find the solution.

只需在每个进度后添加 mainWindow.update() 即可.所以最终的代码是:

simply add mainWindow.update() after each progress. So the final code would be:

def doNothing():
  sleep(0.5)
  barVar.set(10)
  mainWindow.update()
  sleep(0.5)
  barVar.set(20)
  mainWindow.update()
  sleep(0.5)
  barVar.set(30)
  mainWindow.update()

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