before method

Implementation

@override
Future<Page<T, C>> before(K? key, C? cursor, int count) async {
  // [_before] can be `null`, when there's no below the page above.
  if (_before != null) {
    _before = _before! + count;
  }

  final int edgesBefore = _list.length;
  final List<T> edges = await _page();
  final bool fulfilled =
      fulfilledWhenNone || _hasFirst || edges.length - edgesBefore >= count;

  Log.debug(
    'before($key, $count) -> $fulfilled(${edges.length}), hasNext: ${!_hasLast}, hasPrevious: ${!_hasFirst}',
    '$runtimeType',
  );

  _ensureLimits();

  return Page(
    fulfilled ? edges : [],
    PageInfo(
      hasNext: !_hasLast,
      hasPrevious: !_hasFirst,
      startCursor: _firstCursor,
      endCursor: _lastCursor,
    ),
  );
}