Question

您好，我正在尝试在tkinter中创建一个倒数计时器应用程序，并且正在使用此类制作按钮然后开始倒数。我对python和tkinter还是很陌生。

问题是在我多次按下按钮之后，它多次执行了refresh_label，因此倒计时更快。

如何阻止这种情况发生？

    class Countdown():
    def __init__(self,minutes, parent):

        self.minutes = minutes
        self.parent = parent
        self.label = Label(parent,text='00:00',font=("Dense", 30),width=10,
                bg= '#e74c3c')
        self.label.place(x= 245, y= 330)
        self.my_time = dt.time(0, self.minutes, 0)
        self.var = 0
        self.start = Button(self.parent,font=('Dense',15),text="Start", height = 4,
                width = 51, fg = "#a1dbcd", bg="#e74c3c", command = self.refresh_label)
        self.start.grid(row= 1,column=0, pady=415)

    def refresh_label(self):
        # This is the method that starts the countdown. I convert my_time 
        # from datetime.time object to datetime.datetime then i subtract
        # a second in each 1000 ms and I refresh the text of the button 
        self.var += 1
        second = (dt.datetime.combine(dt.date(1, 1, 1), self.my_time)- 
        dt.timedelta(seconds = self.var)).time()
        self.label.configure(text=second)
        self.label.after(1000, self.refresh_label)

Answer 1

按下按钮后，我可能会禁用它，也许直到按下暂停或停止按钮为止。

要禁用按钮，您可以执行以下操作：

myButton['state'] = 'disabled'

或

from tkinter import DISABLED
mybutton['state'] = DISABLED

然后，我将更改start_button_pressed的按钮的回调功能：

self.start = tk.Button(self.parent, [...], command=self.start_button_pressed)

def start_button_pressed(self):
    self.start['state'] = DISABLED
    self.refresh_label()

tkinter按钮限制命令不再重复

1 个答案: