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Description:

infinite scroll pagination

Chosen as a Flutter Favorite by the Flutter Ecosystem Committee

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.

Tutorial #
By raywenderlich.com (step-by-step, hands-on, in-depth, and illustrated).
Usage #
class BeerListView extends StatefulWidget {
@override
_BeerListViewState createState() => _BeerListViewState();
}

class _BeerListViewState extends State<BeerListView> {
static const _pageSize = 20;

final PagingController<int, BeerSummary> _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.getBeerList(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, BeerSummary>(
pagingController: _pagingController,
builderDelegate: PagedChildBuilderDelegate<BeerSummary>(
itemBuilder: (context, item, index) => BeerListItem(
beer: item,
),
),
);

@override
void dispose() {
_pagingController.dispose();
super.dispose();
}
}
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For more usage examples, please take a look at our cookbook or check out the example project.
Features #

Architecture-agnostic: Works with any state management approach, from setState to BLoC. Not even Future usage is assumed.

Layout-agnostic: Out-of-the-box widgets corresponding to GridView, SliverGrid, ListView and SliverList – including .separated constructors. Not enough? You can easily create a custom layout.

API-agnostic: By letting you in complete charge of your API calls, Infinite Scroll Pagination works with any pagination strategy.

Highly customizable: You can change everything. Provide your own progress, error and empty list indicators. Too lazy to change? The defaults will cover you.

Extensible: Seamless integration with pull-to-refresh, searching, filtering and sorting.

Listen to state changes: In addition to displaying widgets to inform the current status, such as progress and error indicators, you can also use a listener to display dialogs/snackbars/toasts or execute any other action.

API Overview #