loadMore method

@override Future<void> loadMore(String nextPageKey)

Load more data from the server using nextPageKey.

Implementation

@override
Future<void> loadMore(String nextPageKey) async {
  final generation = loadGeneration;
  final previousValue = value.asSuccess;

  try {
    final response = await client.search(
      _activeFilter,
      sort: _activeSort,
      query: _activeSearchQuery,
      messageFilters: _activeMessageFilter,
      paginationParams: PaginationParams(limit: limit, next: nextPageKey),
    );

    // Drop the page if a newer search or clearResults() superseded it, so a
    // stale page cannot repopulate the results.
    if (isStale(generation)) return;
    final results = response.results;
    final previousItems = previousValue.items;
    final newItems = previousItems + results;
    final next = response.next;
    final nextKey = next != null && next.isNotEmpty ? next : null;
    value = PagedValue(
      items: newItems,
      nextPageKey: nextKey,
    );
  } on StreamChatError catch (error) {
    if (isStale(generation)) return;
    value = previousValue.copyWith(error: error);
  } catch (error) {
    if (isStale(generation)) return;
    final chatError = StreamChatError(error.toString());
    value = previousValue.copyWith(error: chatError);
  }
}