<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _on_item_activated(self, item):
 """ Emits the message activated signal """

        msg = item.data(QtCore.Qt.UserRole)
        self.msg_activated.emit(msg)