为什么使用self.Destroy()而不是self.Close()时，此wxPython GUI冻结? (示例附后) [英] Why does this wxPython GUI freeze when self.Destroy() is used instead of self.Close()? (example attached)

问题描述

LoginDialog用self.loginButton打开，并且在关闭时，GUI冻结；登录按钮将保持按下状态，并且在尝试单击任何内容时仅会发出警报声.

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()来自此

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版本为3.0，Python 2.7.10

wxPython version is 3.0, Python 2.7.10

以下代码是该问题的有效示例:

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()

推荐答案

如果打算将一个对话框与ShowModal对话框一起使用，则该对话框完成后应调用EndModal，而调用方应为如果需要，谁会调用Destroy从对话框中获取值之后.

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.

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