def __init__(self, app, *args, **kwargs):
super(Gtk.Window, self).__init__(*args, **kwargs)
self.app = app
headerbar = Gtk.HeaderBar()
headerbar.props.show_close_button = True
headerbar.set_title('?????')
self.set_titlebar(headerbar)
self.connect('delete-event', self.delete_event)
self.build_ui()
self.props.resizable = False
self.set_size_request (640, 480)
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