sealed class QuestionEvent { const QuestionEvent(); } class GetLevelEvent extends QuestionEvent { final String? id; const GetLevelEvent(this.id); } class ChooseAnswerEvent extends QuestionEvent { final bool chooseCorrectAnswer; final int correctAnswer; const ChooseAnswerEvent(this.chooseCorrectAnswer, this.correctAnswer); } class GetNextLevelEvent extends QuestionEvent { const GetNextLevelEvent(); }