Question

我正在使用Tkinter在python中编写一个程序。我目前的问题是我有按钮打开另一个窗口。我的问题是它无法打开两个以上的窗口。关于如何解决这个问题的任何想法。

from tkinter import *

class first(object):
    def __init__(self, master):
        self.master = master
        self.admin_btn = Button(master, text = "First", command = self.second)
        self.admin_btn.grid(row = 0, column = 0)

    def second(self):
        self.w = second(self.master)
        self.master.wait_window(self.w.top)

class second(object):
    def __init__(self, master):
        top = self.top = Toplevel(master)
        self.second = Button(top, text = "Second", command = self.third)
        self.second.grid(row= 0, column = 0)

    def third(self):
        self.w = third(self.master)
        self.master.wait_window(self.w.top)

class third(object):
    def __init__(self, master):
        top = self.top = Toplevel(master)
        self.second = Button(top, text = "Third")
        self.second.grid(row= 0, column = 0)


if __name__ == "__main__":
    root = Tk()
    m = first(root)
    root.mainloop()

Answer 1

尝试使用此代码：

import tkinter as tk

class Demo1:
    def __init__(self, master):
        self.master = master
        self.frame = tk.Frame(self.master)
        self.button1 = tk.Button(self.frame, text = 'First', width = 25, command = self.new_window)
        self.button1.pack()
        self.frame.pack()
    def new_window(self):
        self.newWindow = tk.Toplevel(self.master)
        self.app = Demo2(self.newWindow)

class Demo2:
    def __init__(self, master):
        self.master = master
        self.frame = tk.Frame(self.master)
        self.quitButton = tk.Button(self.frame, text = 'Second', width = 25, command = self.close_windows)
        self.quitButton.pack()
        self.frame.pack()
    def close_windows(self):
        self.master.destroy()

def main(): 
    root = tk.Tk()
    app = Demo1(root)
    root.mainloop()

if __name__ == '__main__':
    main()

在此代码中，我添加了两个窗口，但您可以添加第三个窗口。

Answer 2

你在第二个窗口忘记了

self.master = master

当您尝试打开第三个窗口时收到错误消息。

但您应该将Toplevel(master)分配给self. master，然后使用self.master代替self.top

from tkinter import *


class First(object):

    def __init__(self, master):
        self.master = master # = Tk()
        self.btn = Button(self.master, text="First", command=self.second)
        self.btn.grid(row=0, column=0)

    def second(self):
        self.w = Second(self.master)
        self.master.wait_window(self.w.master)


class Second(object):

    def __init__(self, master):
        self.master = Toplevel(master)
        self.btn = Button(self.master, text="Second", command=self.third)
        self.btn.grid(row=0, column=0)

    def third(self):
        self.w = Third(self.master)
        self.master.wait_window(self.w.master)


class Third(object):

    def __init__(self, master):
        self.master = Toplevel(master)
        self.btn = Button(self.master, text="Third")
        self.btn.grid(row=0, column=0)


if __name__ == "__main__":
    root = Tk()
    first = First(root)
    root.mainloop()

现在所有课程都非常相似 - 他们有self.master = Tk()或self.master = Toplevel(master)

顺便说一句：对类使用CamelCase名称 - First，Second，Third - 它有助于识别代码中的类。

Answer 3

我建议你所有的类继承自Toplevel而不是object，这样，你的所有类都会有master属性（这就是你有错误的原因，second类没有一个）：

from tkinter import *

class First(Toplevel):
    def __init__(self, master):
        Toplevel.__init__(self, master)
        self.admin_btn = Button(self, text = "First", command = self.second)
        self.admin_btn.grid(row=0, column=0)

    def second(self):
        self.w = Second(self)
        self.wait_window(self.w)

class Second(Toplevel):
    def __init__(self, master):
        Toplevel.__init__(self, master)
        self.second = Button(self, text = "Second", command = self.third)
        self.second.grid(row=0, column=0)

    def third(self):
        self.w = Third(self.master)
        self.wait_window(self.w)

class Third(Toplevel):
    def __init__(self, master):
        Toplevel.__init__(self, master)
        self.second = Button(self, text = "Third")
        self.second.grid(row=0, column=0)


if __name__ == "__main__":
    root = Tk()
    m = First(root)
    m.lift(root)
    root.wait_window(m)
    root.mainloop()

Tkinter不会打开两个以上的窗口

3 个答案: