/infinite_scroll_pagination

Flutter package to help you lazily load and display pages of items as the user scrolls down your screen.

Primary LanguageDartMIT LicenseMIT

Package Logo with Flutter Favorite Badge

Chosen as a Flutter Favorite by the Flutter Ecosystem Committee

Pub.dev Badge GitHub Build Badge Code Coverage Badge Gitter Badge Effective Dart Badge MIT License Badge Flutter Platform Badge


Infinite Scroll Pagination

Unopinionated, extensible and highly customizable package to help you lazily load and display small chunks of items as the user scrolls down the screen – known as infinite scrolling pagination, endless scrolling pagination, auto-pagination, lazy loading pagination, progressive loading pagination, etc.

Designed to feel like part of the Flutter framework.

Example Project

Tutorial

By raywenderlich.com (step-by-step, hands-on, in-depth and illustrated).

Usage

class CharacterListView extends StatefulWidget {
  @override
  _CharacterListViewState createState() => _CharacterListViewState();
}

class _CharacterListViewState extends State<CharacterListView> {
  static const _pageSize = 20;

  final PagingController<int, CharacterSummary> _pagingController =
      PagingController(firstPageKey: 0);

  @override
  void initState() {
    _pagingController.addPageRequestListener((pageKey) {
      _fetchPage(pageKey);
    });
    super.initState();
  }

  Future<void> _fetchPage(int pageKey) async {
    try {
      final newItems = await RemoteApi.getCharacterList(pageKey, _pageSize);
      final isLastPage = newItems.length < _pageSize;
      if (isLastPage) {
        _pagingController.appendLastPage(newItems);
      } else {
        final nextPageKey = pageKey + newItems.length;
        _pagingController.appendPage(newItems, nextPageKey);
      }
    } catch (error) {
      _pagingController.error = error;
    }
  }

  @override
  Widget build(BuildContext context) => 
      // Don't worry about displaying progress or error indicators on screen; the 
      // package takes care of that. If you want to customize them, use the 
      // [PagedChildBuilderDelegate] properties.
      PagedListView<int, CharacterSummary>(
        pagingController: _pagingController,
        builderDelegate: PagedChildBuilderDelegate<CharacterSummary>(
          itemBuilder: (context, item, index) => CharacterListItem(
            character: item,
          ),
        ),
      );

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

For more usage examples, please take a look at our cookbook or check out the example project.

Features

API Overview

API Diagram