PagedListView | 通用列表翻页组件，快速滚动一屏，优化 ListView/GridView的滑动和滚动体验。Scroll | Grid library

class PaginatedList extends StatefulWidget {
  const PaginatedList({Key? key}) : super(key: key);

  @override
  _PaginatedListState createState() => _PaginatedListState();
}

class _PaginatedListState extends State {
  //*bloc assuming you use getIt and injectable
  late final _timeLotBloc = getIt();

  List records = [];

  //*initialize page controller
  final PagingController _pagingController =
      PagingController(firstPageKey: 0);

  @override
  void initState() {
    super.initState();

    //*so at event add list of records
    _pagingController.addPageRequestListener(
      (pageKey) => _timeLotBloc
          .add(GetTimeslotViewEvent(records: records, offset: pageKey,limit: 10)),
    );
  }

  @override
  void dispose() {
    super.dispose();
    _timeLotBloc.close();
    _pagingController.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      create: (context) => _timeLotBloc,
      child: BlocListener(
        listener: (context, state) {
          if (state is TimeslotViewLoadedState) {

            records =state.records;
          
            //forget about existing record
            //about the last page, fetch last page number from 
            //backend

            int lastPage = state.lastPage
            final _next = 1 + records.length;

            if(_next>lastPage){
              _pagingController.appendLastPage(records);
              }
            else{
               _pagingController.appendPage(records, _next);
            }
            
            
          }
          if (state is TimeslotViewErrorState) {
            _pagingController.error = state.error;
          }
          
        },child: BlocBuilder(
          builder: (context,state)=> PagedListView(
            pagingController: _pagingController,
            builderDelegate: PagedChildBuilderDelegate(
            itemBuilder: (context, time, index) => TimeslotViewEntityListItem(
            character: time,
          ),
        ),
      ),),
      ),
    );
  }
}