class Mp3Frame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, parent=None, title="Mp3 Tag Editor")
        self.panel = Mp3Panel(self)
        self.create_menu()
        self.Show()

    def create_menu(self):
        menu_bar = wx.MenuBar()
        file_menu = wx.Menu()
        open_folder_menu_item = file_menu.Append(
            wx.ID_ANY, "Open Folder", "Open a folder with MP3s"
        )
        menu_bar.Append(file_menu, "&File")
        self.Bind(
            event=wx.EVT_MENU,
            handler=self.on_open_folder,
            source=open_folder_menu_item,
        )
        self.SetMenuBar(menu_bar)

    def on_open_folder(self, event):
        title = "Choose a directory:"
        dlg = wx.DirDialog(self, title, style=wx.DD_DEFAULT_STYLE)
        if dlg.ShowModal() == wx.ID_OK:
            self.panel.update_mp3_listing(dlg.GetPath())
        dlg.Destroy()