fetch_more
I inspired from Felix Angelov's flutter bloc examples
A Flutter package that helps to collect and show data inside a ListView with a limit and fetch more when user needs more data. Also has a RefreshIndicator that sends request with index zero.
Latest Stable Version
fetch_more: 2.0.0
FetchMoreBuilder with specify the LoaderWidgets
You don't need to specify LoaderWidgets.
Widget buildFetchMoreWidget(BuildContext context) {
return FetchMoreBuilder(
errorWidget: Center(child: Text('Error Widget')),
bottomLoaderWidget: Center(child: Text('Bottom Loader')),
refreshLoaderWidget: Center(child: Text('Refresh Loader')),
itemBuilder: _itemBuilder,
dataFetcher: _dataFetcher,
limit: 20,
);
}
FetchMoreBuilder
Widget buildFetchMoreWidget(BuildContext context) {
return FetchMoreBuilder(
itemBuilder: _itemBuilder,
dataFetcher: _dataFetcher,
limit: 20,
);
}
DataFetcher:
Future<List<dynamic>> _dataFetcher(int index, int limit,
[String searchTerm]) async {
await Future.delayed(Duration(milliseconds: 1000));
List list = [];
if (index == 60) {
// returning empty List tells to the FetchMoreBuilder data finished.
return list;
}
for (int i = 0; i < limit; i++) {
Random rdm = Random();
list.add(rdm.nextInt(100));
}
return list;
}
ItemBuilder
Widget _itemBuilder(BuildContext context, List list, int index) {
return Card(
child: Container(
height: 50,
child: Center(
child: Text(
list.elementAt(index).toString(),
),
),
),
);
}
FetchMoreController Usage
final GlobalKey<FetchMoreBuilderState> _fetchMoreController =
GlobalKey<FetchMoreBuilderState>();
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: Scaffold(
appBar: AppBar(
title: Text('Fetch More Builder'),
),
body: FetchMoreBuilder(
fetchMoreController: _fetchMoreController,
itemBuilder: _itemBuilder,
dataFetcher: _dataFetcher,
limit: 10,
),
floatingActionButton: Row(
crossAxisAlignment: CrossAxisAlignment.end,
mainAxisAlignment: MainAxisAlignment.spaceAround,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
FloatingActionButton(
child: Icon(Icons.refresh),
onPressed: () {
_fetchMoreController.currentState.refresh();
},
),
SizedBox(width: 15,),
FloatingActionButton(
child: Icon(Icons.get_app),
onPressed: () {
_fetchMoreController.currentState.fetch();
},
),
],
),
),
);
}
Getting Started
This project is a starting point for a Dart package, a library module containing code that can be shared easily across multiple Flutter or Dart projects.
For help getting started with Flutter, view our online documentation, which offers tutorials, samples, guidance on mobile development, and a full API reference.