def METHOD_NAME(self, model: LyricModel):
    if model is None:
        self._lyric = self._trans_lyric = None
    elif model.content:
        self._lyric = Lyric.from_content(model.content)
        self._trans_lyric = Lyric.from_content(model.trans_content) \
            if model.trans_content else None
    self.lyrics_changed.emit(self._lyric, self._trans_lyric)