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推迟在Tkinter实施处决
原标题:Scheduling sequential executions in Tkinter with delays

我正试图履行改变我依次表象的职能,但拖延了用户在第一次改动之后,但在第二次修改之前能够看到国家。

我很快获悉,不要使用<代码>时间.sleep(1000),以插入第二个延迟,因为它使国际不动产公司停下来(和坠机)。 虽然其他答复说,它不应坠毁。

我先使用<代码>,然后在后进行;

def callback():
    self.colorFrame.configure(background="red")
    self.after(1000)
    self.colorFrame.configure(background="black")

self = tk.Tk()

self.colorFrame = tk.Frame(self, width=500, height=500)
self.colorFrame.pack()
self.parentFrame = tk.Frame(self)
self.parentFrame.pack()
self.button = tk.Button(self.parentFrame, text="Trigger Changes", command=callback)
self.button.pack()

tk.mainloop()

On my machine, at least, running that snippet creates a window with a button which when pressed turns the frame above it black 1 second later. I never see any red background. Am I misusing the function? Or is this the wrong approach?

问题回答

As jasonharper suggested, a state machine is a better way of achieving this result without chaining individual function calls together. For the case of color cycling I came up with this code:

import tkinter as tk

def callback():
    colorCycleStateMap = {
        "red": "orange",
        "orange": "yellow",
        "yellow": "green",
        "green": "violet",
        "violet": "indigo",
        "indigo": "blue",
        "blue": "black",
        "black": "break"
    }
    currentColor = self.colorFrame["background"]
    if colorCycleStateMap[currentColor] == "break":
        return
    
  self.colorFrame.configure(background=colorCycleStateMap[currentColor])
    self.after(1000, callback)

self = tk.Tk()

self.colorFrame = tk.Frame(self, width=500, height=500, background="red")
self.colorFrame.pack()
self.parentFrame = tk.Frame(self)
self.parentFrame.pack()
self.button = tk.Button(self.parentFrame, text="Trigger Changes", command=callback)
self.button.pack()

tk.mainloop()




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