拦截关闭窗口按钮(Tkinter 窗口)抛出 Tcl 错误 [英] Intercepting the close window button (Tkinter window) throws an Tcl error

问题描述

我有一个程序，它会在某个时候打开一个新窗口(充满按钮和 Gizmo 供用户选择和使用)，其定义如下:

I have a program that at some point opens a new window (filled with buttons and gizmo's for the user to select and play around with) that is defined as follows:

def window(self,master):
  def close(self):
    # change some variables
    self.destroy()
  top = self.top = Toplevel()
  # Several lines of buttons
  top.lift()
  top.protocol("WM_DELETE_WINDOW",close(self))

我最初在那里有一个关闭按钮，可以很好地包装所有内容，但我注意到如果用户在窗口的角落使用标准的X"，则显然不会调用此函数，这会产生很多后面的问题.我从本网站上的其他一些问题中发现了WM_DELETE_WINDOW"建议，但它给了我一个相当奇怪的错误:

I initially had a close button there that would wrap everything up nicely but I noticed that if the user used the standard 'X' in the corner of the window, this function obviously would not be called and that would give a lot of problems later on. I found out about the 'WM_DELETE_WINDOW' suggestion from some other questions on this website but it gives me a rather strange error:

  File "/usr/lib/python2.7/lib-tk/Tkinter.py", line 1630, in wm_protocol
    'wm', 'protocol', self._w, name, command)
TclError: bad window path name ".33862072"

我认为它以某种方式获取了错误的窗口 ID 并且无法捕获该事件.因此，我的问题是，这是真的还是假的，其次我应该如何继续处理这个问题.

I assume that it somehow has gotten the wrong window ID and is unable to catch the event. My question is thus, is that true or not and secondly how should I continue to deal with this issue.

推荐答案

让我们看看这行代码:

top.protocol("WM_DELETE_WINDOW",close(self))

这行代码是说立即调用函数close(self)，并将结果分配给协议处理程序.看到问题了吗?它立即调用了close，可能在 self 完全构造之前.您不希望该函数被调用，您希望将引用传递给功能.

This line of code is saying "immediately call the function close(self), and assign the result to the protocol handler. See the problem? It's immediately calling close, likely before self has been fully constructed. You don't want the function to be called, you want to pass in a reference to the function.

使 close 成为 self 的方法(而不是嵌入函数)并将对 top.protocol 的调用更改为如下所示(注意缺少尾随括号):

Make close be a method of self (rather than an embedded function) and change the call to top.protocol to look like this (note the lack of trailing parenthesis):

top.protocol("WM_DELETE_WINDOW", self.close)

如果您更喜欢保留嵌套函数，可以使用 lambda:

If you prefer to keep the nested function, you can use lambda:

top.protocol("WM_DELETE_WINDOW", lambda window=self: close(window))

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