dart 时分秒的展示

String durationToString(int time) {
    if (time == null || time == 0) {
      return '00:00';
    }

    String second = (time % 60).toInt().toString().padLeft(2, '0');
    String minute = (time / 60 % 60).toInt().toString().padLeft(2, '0');
    String hour = (time ~/ 3600).toInt().toString().padLeft(2, '0');

    if (time < 3600) {
      return "$minute:$second";
    } else {
      return '$hour:$minute:$second';
    }
  }