grab_set() 函数在 tkinter 中不起作用 [英] grab_set() function not working in tkinter

问题描述

我之前问过一个关于相同的问题，这里是一个链接:眨眼"如果单击父窗口，则提示窗口 Tkinter

I have asked a question previously about the same, here is a link to that: "Blink" Prompt window if parent window is clicked Tkinter

但它被标记为重复.请帮助我编写代码，因为即使经过反复尝试，我也无法在我的代码中实现grab_set().有人建议我提出一个新问题，所以在这里.

But it was marked as duplicate. Please help me with my code as I am not able to implement grab_set() in my code even after repeated tries. I was advised to open a new question, so here it is.

我的代码:

import tkinter
from tkinter import *

def mainwindow():
  root = Tk()
  root.geometry("100x100")

  b1 = Button(root, text="Exit", command=prompt)
  b1.place(x=50, y=40)
  mainloop()

def prompt():
  pr = Tk()
  pr.geometry("175x100")
  pr.grab_set()

  lable = Label(pr, text="Do you want to exit?").grid(row=0, column=0, padx=20, pady=15)
  b1 = Button(pr, text="Yes", command=exit).grid(row=1, column=0, padx=75)
  mainloop()

mainwindow()

即使将 grab_set() 放在 pr 窗口后，我也可以访问 root 窗口.请告诉将这个函数放入我的代码中的正确方法.

Even after putting grab_set() on the pr window , I can access the root window. Please tell the correct way to put this function inside my code.

推荐答案

您的代码有一些问题，如前一个答案中指出的(第二个使用 Toplevel 而不是 Tkwindow 并仅使用 mainloop 一次)和其他一些您应该避免的更多内容，例如两次导入 tkinter，在局部变量的函数内创建根窗口，或执行 b1 = Button(..).grid(...)，当 grid() 方法没有返回任何东西时，所以 b1 = None.除此之外，对于退出应用程序提示，我认为您会更喜欢使用 grab_set_global()，但正如我之前告诉您的，您必须小心使用抓取，因为 tkinter 只能抓取具有已映射到屏幕上，因此您需要先使用 wait_visibility().这是您的代码的改进:

Your code has some problems like pointed in previous answer (use Toplevel instead of Tk for the second window and use mainloop only once) and a few other mores that you should avoid, like importing tkinter twice, creating the root window inside a function in a local variable, or doing b1 = Button(..).grid(...), when the grid() method doesn't return anything so b1 = None. Beside that, for an exit application prompt, I think you will prefer to use grab_set_global(), but as I told you before, you have to be careful with grab since tkinter can only grab a window that has been mapped on the screen, thus you need to use wait_visibility() before. Here is an improvement of your code:

from tkinter import *

def mainwindow():
    root.geometry("100x100")

    b1 = Button(root, text="Exit", command=prompt)
    b1.place(x=50, y=40)

def prompt():
    pr = Toplevel()
    pr.geometry("175x100")
    pr.wait_visibility()
    pr.grab_set_global()

    label = Label(pr, text="Do you want to exit?").grid(row=0, column=0, padx=20, pady=15)
    Button(pr, text="Yes", command=exit).grid(row=1, column=0, padx=75)

root = Tk()   
mainwindow()
root.mainloop()

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