sectionInfoForPosition method

@override SectionInfo? sectionInfoForPosition(int position)

通过position获取对应的sectionInfo

Implementation

@override
SectionInfo? sectionInfoForPosition(int position) {

  if(_totalCount == null) return null;

  if(position == 0 && shouldExistHeader()){
    return _headerSectionInfo;
  }

  if(position == totalCount - 1 && shouldExistFooter()){
    return _footerSectionInfo;
  }

  if (_sectionInfos.length == 0) return null;

  var info = _sectionInfos[0];
  for (int i = 1; i < _sectionInfos.length; i++) {
    var sectionInfo = _sectionInfos[i];
    if (sectionInfo.sectionBegin > position) {
      break;
    } else {
      info = sectionInfo;
    }
  }
  return info;
}