minus method

int? minus([
  1. int value = 1
])

减一个值 并发射

Implementation

int? minus([int value = 1]) {
  if (_subject.isClosed) {
    L.w('IO在close状态下请求发送数据');
    return null;
  }

  int result;
  if (_remainder != null) {
    result = (latest - value).remainder(_remainder!);
    if (_min != null) {
      result = math.max(_min!, result);
    }
  } else if (_min != null) {
    result = math.max(latest - value, _min!);
  } else {
    result = latest - value;
  }
  _subject.add(result);
  return result;
}