如何在主框架中捕获子框架关闭事件？

Question

在 WxPython 中，我在父框架 (ParentFrame) 上的菜单上打开了一个新框架 (ChildFrame)。子框架用于将数据添加到配置文件。添加数据后（即关闭或单击 ChildFrame 中的按钮），我需要让父框架知道并刷新。如何在 wxPython 中做到这一点？

class ParentFrame(wx.Frame):
    def __init__(self,parent,id):
        ...
        self.Bind(wx.EVT_MENU, self.ShowChildFrame, None, ID_MENU_ITEM)


    def ShowChildFrame(self, event):
        self.child_frame= ChildFrame(parent=None, id=-1, title='New Frame Title')
        self.Bind(self.child_frame.EVT_CLOSE, self.OnChildFrameClose) #this does not work since no EVT_CLOSE is available
        self.child_frame.Show()

    def OnChildFrameClose(self, event):
        #do something

 class ChildFrame(wx.Frame):
    ...

Answer 1

您可以使用 PubSub。它带有 wxPython 并允许您订阅事件。这将让您订阅特定的“关闭事件”。然后在您的子框架中，您可以在捕获子框架的关闭事件时发布它正在关闭。以下教程可能会有所帮助：

• http://www.blog.pythonlibrary.org/2013/09/05/wxpython-2-9-and-the-newer-pubsub-api-a-simple-tutorial/

这是文章中的代码（注意：这需要 wxPython 2.9 或更高版本）：

import wx
from wx.lib.pubsub import pub 

########################################################################
class OtherFrame(wx.Frame):
    """"""

    #----------------------------------------------------------------------
    def __init__(self):
        """Constructor"""
        wx.Frame.__init__(self, None, wx.ID_ANY, "Secondary Frame")
        panel = wx.Panel(self)

        msg = "Enter a Message to send to the main frame"
        instructions = wx.StaticText(panel, label=msg)
        self.msgTxt = wx.TextCtrl(panel, value="")
        closeBtn = wx.Button(panel, label="Send and Close")
        closeBtn.Bind(wx.EVT_BUTTON, self.onSendAndClose)

        sizer = wx.BoxSizer(wx.VERTICAL)
        flags = wx.ALL|wx.CENTER
        sizer.Add(instructions, 0, flags, 5)
        sizer.Add(self.msgTxt, 0, flags, 5)
        sizer.Add(closeBtn, 0, flags, 5)
        panel.SetSizer(sizer)

    #----------------------------------------------------------------------
    def onSendAndClose(self, event):
        """
        Send a message and close frame
        """
        msg = self.msgTxt.GetValue()
        pub.sendMessage("panelListener", message=msg)
        pub.sendMessage("panelListener", message="test2", arg2="2nd argument!")
        self.Close()

########################################################################
class MyPanel(wx.Panel):
    """"""

    #----------------------------------------------------------------------
    def __init__(self, parent):
        """Constructor"""
        wx.Panel.__init__(self, parent)
        pub.subscribe(self.myListener, "panelListener")

        btn = wx.Button(self, label="Open Frame")
        btn.Bind(wx.EVT_BUTTON, self.onOpenFrame)

    #----------------------------------------------------------------------
    def myListener(self, message, arg2=None):
        """
        Listener function
        """
        print "Received the following message: " + message
        if arg2:
            print "Received another arguments: " + str(arg2)

    #----------------------------------------------------------------------
    def onOpenFrame(self, event):
        """
        Opens secondary frame
        """
        frame = OtherFrame()
        frame.Show()

########################################################################
class MyFrame(wx.Frame):
    """"""

    #----------------------------------------------------------------------
    def __init__(self):
        """Constructor"""
        wx.Frame.__init__(self, None, title="New PubSub API Tutorial")
        panel = MyPanel(self)
        self.Show()

#----------------------------------------------------------------------
if __name__ == "__main__":
    app = wx.App(False)
    frame = MyFrame()
    app.MainLoop()

或者，您可以创建wx.Dialog 的子类并使用它来代替框架。然后，您可以模态显示对话框并以与内置对话框相同的方式捕获其关闭。

Answer 2

您必须绑定到子框架而不是父框架并使用 wx.EVT_CLOSE 事件。

import wx


class ParentFrame(wx.Frame):

    def __init__(self, *args, **kwargs):
        super(ParentFrame, self).__init__(*args, **kwargs)

    def ShowChildFrame(self):
        self.child_frame = wx.Frame(self, title='New Frame Title')
        self.child_frame.Bind(wx.EVT_CLOSE, self.OnChildFrameClose)
        self.child_frame.Show()

    def OnChildFrameClose(self, event):
        print 'do something'
        event.Skip()


app = wx.App()
frame = ParentFrame(None, title='Parent Frame')
frame.Show()
frame.ShowChildFrame()
app.MainLoop()