infinite_pagination 0.0.4

Truly infinite list helper, provider fixed memory consumption.

Truly infinite list

This package maybe is the Most Simplest Wrap for truly infinite list.

Features:

• Fixed memory consumption, only cache fixed number of items in mempory.
• Progressive placeholder for async loading.
• An async fetching function for a page of items.
• Support ListView, GridView and SliverList.

Screenshot

When Pull up, the progressive placeholder indicate loading.

When Drag down, out of screen items was evicted is loading again.

Animation demo.

How to use

To use this plugin, add infinite_pagination as a dependency in your pubspec.yaml file. For example:

dependencies:
  infinite_pagination:
  provider:

Usually we use provider as State Management.

import 'package:infinite_pagination/infinite_pagination.dart';


class Catalog extends InfinitePagination<Chapter> {
  Catalog()
      : super(
          fetcher: (int startingIndex, int itemsPerPage) async => 
              fetchPage<Chapter>(
            startingIndex: startingIndex,
            countPerPage: 10,
            total: 142,
            mock: (i) => Chapter(i),
            delay: 500,
          ),
        );
}

Widget build(BuildContext context) {
    return ChangeNotifierProvider(
      create: (_) => Catalog(),
      child: Selector<Catalog, int>(
          selector: (context, catalog) => catalog.itemCount,
          builder: (context, itemCount, child) => ListView.builder(
            key: PageStorageKey('ListView'),
            itemCount: itemCount,
            itemBuilder: (context, index) {
              // Every item of the `ListView` is individually listening
              // to the catalog.
              var catalog = Provider.of<Catalog>(context);

              // Catalog provides a single synchronous method for getting
              // the current data.
              var item = catalog.getByIndex(index);

              if (item == null) {
                return LoadingTile();
              }

              return ListTile(
                leading: CircleAvatar(child: Text('${item.i}')),
                title: Text('Chapter #${item.i}'),
                subtitle: Text('subtitle ${item.i}'),
              );
            },
          ),
        ),
    );
}

Best experience of saving memory

• Use file_cache cache Http Request in file system.
• Use this package indicate loading and infinite paging.

This package is inspired by(copy from) official sample