wxpython-如何从自定义wx对话框中获取返回值

import wx

class MyDialog(wx.Dialog):
    def __init__(self, parent):
        super().__init__(parent, title="自定义对话框")
        
        self.text_ctrl = wx.TextCtrl(self)
        ok_button = wx.Button(self, wx.ID_OK, label="确定")
        cancel_button = wx.Button(self, wx.ID_CANCEL, label="取消")
        
        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(self.text_ctrl, 0, wx.EXPAND|wx.ALL, 10)
        sizer.Add(ok_button, 0, wx.ALIGN_CENTER|wx.ALL, 10)
        sizer.Add(cancel_button, 0, wx.ALIGN_CENTER|wx.ALL, 10)
        
        self.SetSizerAndFit(sizer)
        
    def GetValue(self):
        return self.text_ctrl.GetValue()

class MyFrame(wx.Frame):
    def __init__(self):
        super().__init__(None, title="主窗口")
        
        panel = wx.Panel(self)
        button = wx.Button(panel, label="打开对话框")
        button.Bind(wx.EVT_BUTTON, self.OnOpenDialog)
        
        sizer = wx.BoxSizer(wx.VERTICAL)
        sizer.Add(button, 0, wx.ALIGN_CENTER|wx.ALL, 10)
        
        panel.SetSizerAndFit(sizer)
        
    def OnOpenDialog(self, event):
        dialog = MyDialog(self)
        if dialog.ShowModal() == wx.ID_OK:
            value = dialog.GetValue()
            print("返回值：", value)
        dialog.Destroy()

app = wx.App()
frame = MyFrame()
frame.Show()
app.MainLoop()