在Tkinter的背景中运行无限循环 [英] Run an infinite loop in the backgroung in Tkinter

问题描述

我希望代码在后台运行并定期更新我的GUI.我该怎么做?

I would like the code to run in the background and to update my GUI periodically. How can I accomplish this?

例如，假设我想在GUI代码的背景中执行类似的操作，如下所示:

For example, suppose I want to execute something like this in the background of the GUI code you can see below:

x = 0

while True:
   print(x)
   x = x + 1
   time.sleep(1)

这是GUI代码:

class GUIFramework(Frame):

    def __init__(self,master=None):
        Frame.__init__(self,master)
        self.master.title("Volume Monitor")
        self.grid(padx=10, pady=10,sticky=N+S+E+W)
        self.CreateWidgets()

    def CreateWidgets(self):
        textOne = Entry(self, width=2)
        textOne.grid(row=1, column=0)

        listbox = Listbox(self,relief=SUNKEN)
        listbox.grid(row=5,rowspan=2,column=0,columnspan=4,sticky=N+W+S+E,pady=5)
        listbox.insert(END,"This is an alert message.")

if __name__ == "__main__":
    guiFrame = GUIFramework()
    guiFrame.mainloop()

推荐答案

尚不清楚您顶部的代码应该做什么，但是，如果您只是想每秒调用一次函数(或每调用一次，每次调用一次)所需的秒数)，则可以使用 after 方法.

It is a little unclear what your code at the top is supposed to do, however, if you just want to call a function every second (or every the amount of seconds you want), you can use the after method.

因此，如果您只想对textOne进行操作，则可能需要执行以下操作:

So, if you just want to do something with textOne, you'd probably do something like:

...
textOne = Entry(self, width=2)
textOne.x = 0

def increment_textOne():
    textOne.x += 1

    # register "increment_textOne" to be called every 1 sec
    self.after(1000, increment_textOne) 

您可以将此函数作为您类的方法(在本例中，我将其称为callback)，您的代码将如下所示:

You could make this function a method of your class (in this case I called it callback), and your code would look like this:

class Foo(Frame):

    def __init__(self, master=None):
        Frame.__init__(self, master)
        self.x = 0
        self.id = self.after(1000, self.callback)

    def callback(self):
        self.x += 1
        print(self.x)
        #You can cancel the call by doing "self.after_cancel(self.id)"
        self.id = self.after(1000, self.callback)  

gui = Foo()
gui.mainloop()

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