[英]Using super() on tk.TopLevel, but do not generate second window?
I am attempting to implement a trivial MVC application.我正在尝试实现一个简单的 MVC 应用程序。 When super().__init__()
is called, two windows are generated in my python application.当调用super().__init__()
时,在我的 python 应用程序中生成了两个 windows。
What is the appropriate usage when attempting to inherit from tk.TopLevel, when I only want to generate one window?当我只想生成一个 window 时,尝试从 tk.TopLevel 继承时,适当的用法是什么?
import tkinter as tk
from tkinter import ttk
class View(tk.Toplevel):
def __init__(self, controller):
super().__init__()
self.controller = controller
def exec_main(self):
self.mainloop()
class Controller:
def __init__(self):
self.view = View(self)
if __name__ == '__main__':
app = Controller()
app.view.exec_main()
Doing something like super().__init__(master=self)
or super().__init__(self)
does not seem to be the solution.做类似super().__init__(master=self)
或super().__init__(self)
似乎不是解决方案。
An alternative approach would be to do something like this for the main:另一种方法是对主要做这样的事情:
import tkinter as tk
class View(tk.Toplevel):
def __init__(self, master):
tk.Toplevel.__init__(self, master)
class Controller:
def __init__(self, root):
self.view = View(root)
if __name__ == '__main__':
root = tk.Tk()
root.withdraw()
app = Controller(root)
root.mainloop()
But this seems wasteful.但这似乎很浪费。
Without exception, every widget except the root window requires a parent.无一例外,除了根 window 之外的每个小部件都需要一个父小部件。 If you don't create a root window then one will be created for you.如果您不创建根 window,那么将为您创建一个。 When you create an instance of Toplevel
and call super().__init__()
, if you don't have a root window then tkinter will create one for you.当您创建Toplevel
实例并调用super().__init__()
时,如果您没有根 window ,那么 tkinter 将为您创建一个。
As you've observed, the correct workaround is to explicitly create a root window and then hide it.正如您所观察到的,正确的解决方法是显式创建根 window 然后隐藏它。 You have to make sure to give the user a way to destroy this root window since it won't automatically be destroyed when you close the Toplevel
windows.您必须确保为用户提供一种销毁此根 window 的方法,因为当您关闭顶层Toplevel
时它不会自动销毁。
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