(self, widget,  path,  view_column)
Handle item double-click and return
Handle item double-click and return
Handle item double - click and return
def on_row_activated(self, widget,  path,  view_column):
        """Handle item double-click and return"""
        self.launch_layout()
def on_row_activated ( self , widget , path , view_column ) : self . launch_layout ( )