Why does this wxPython GUI freeze when self.Destroy() is used instead of self.Close()? (example attached)

问题

LoginDialog is opened with self.loginButton, and upon closing it, the GUI freezes; the login button remains pressed, and there are only alert sounds when attempting to click on anything.

LoginDialog() was from this tutorial, just augmented with the file-write line in onLogin (which isn't the problem source). All appears to work when switching from self.Destroy() to self.Close().

wxPython version is 3.0, Python 2.7.10

The following code is a working example of the issue:

import wx

# wxGlade dependency
import gettext

class MyFrame(wx.Frame):
    def __init__(self, *args, **kwds):
        wx.Frame.__init__(self, *args, **kwds)

        self.updateLoginButton = wx.Button(self, wx.ID_ANY, _("Store/Update Login"))

        self.Bind(wx.EVT_BUTTON, self.updateLogin, self.updateLoginButton)

        self.__set_properties()
        self.__do_layout()

    def __set_properties(self):
        self.SetTitle(_("Dialog Test"))

    def __do_layout(self):
        sizer_1 = wx.BoxSizer(wx.VERTICAL)
        grid_sizer_1 = wx.FlexGridSizer(3, 1, 1, 0)

        exportButtons_sizer = wx.FlexGridSizer(1, 1, 1, 10)
        exportButtons_sizer.Add(self.updateLoginButton, 0, wx.TOP | wx.ALIGN_CENTER, 15)

        grid_sizer_1.Add(exportButtons_sizer, 0, wx.TOP | wx.ALIGN_CENTER, 20)

        sizer_1.Add(grid_sizer_1, 1, wx.ALL | wx.EXPAND, 15)

        self.SetSizer(sizer_1)
        sizer_1.Fit(self)
        self.Layout()

    def updateLogin(self, event):
        dlg = LoginDialog(self, -1)
        dlg.ShowModal()

class MyApp(wx.App):
    def OnInit(self):
        frame_1 = MyFrame(None, wx.ID_ANY, "")
        self.SetTopWindow(frame_1)
        frame_1.Show()
        return True

class LoginDialog(wx.Dialog):
    """
    Class to define login dialog
    """

    # ----------------------------------------------------------------------
    def __init__(self, parent, id, title="Update Login Info"):
        """Constructor"""
        wx.Dialog.__init__(self, parent, id, title)

        # user info
        user_sizer = wx.BoxSizer(wx.HORIZONTAL)

        user_lbl = wx.StaticText(self, label="Username:")
        user_sizer.Add(user_lbl, 0, wx.ALL | wx.CENTER, 5)
        self.user = wx.TextCtrl(self)
        user_sizer.Add(self.user, 0, wx.ALL, 5)

        # pass info
        p_sizer = wx.BoxSizer(wx.HORIZONTAL)

        p_lbl = wx.StaticText(self, label="Password:")
        p_sizer.Add(p_lbl, 0, wx.ALL | wx.CENTER, 5)
        self.password = wx.TextCtrl(self, style=wx.TE_PASSWORD | wx.TE_PROCESS_ENTER)
        p_sizer.Add(self.password, 0, wx.ALL, 5)

        main_sizer = wx.BoxSizer(wx.VERTICAL)
        main_sizer.Add(user_sizer, 0, wx.ALL, 5)
        main_sizer.Add(p_sizer, 0, wx.ALL, 5)

        btn = wx.Button(self, label="OK")
        btn.Bind(wx.EVT_BUTTON, self.onLogin)
        main_sizer.Add(btn, 0, wx.ALL | wx.CENTER, 5)

        self.SetSizer(main_sizer)

        self.__set_properties()

    # ----------------------------------------------------------------------
    def onLogin(self, event):
        """
        Check credentials and login
        """
        password = self.password.GetValue()
        email = self.user.GetValue()

        with open('login.txt', 'w') as f:
            f.write(email + ', ' + password)

        self.Destroy()

    def __set_properties(self):
        self.user.SetMinSize((220, 20))


if __name__ == "__main__":
    gettext.install("app")

    app = MyApp(0)
    app.MainLoop()

回答1:

If a dialog is intended to be used with ShowModal dialog then the dialog should call EndModal when it is done, and the caller should be the one who calls Destroy after it has fetched values from the dialog if needed.

来源：https://stackoverflow.com/questions/41084112/why-does-this-wxpython-gui-freeze-when-self-destroy-is-used-instead-of-self-cl

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python

wxpython

freeze