flutter_cached 4.2.1 flutter_cached: ^4.2.1 copied to clipboard
🧾 Flutter widget allowing cache-based data display featuring swipe-to-refresh and an error banner.
import 'dart:math';
import 'package:flutter/material.dart';
import 'package:flutter_cached/flutter_cached.dart';
import 'cached_raw_builder.dart';
import 'cached_builder.dart';
void main() => runApp(MyApp());
class MyApp extends StatefulWidget {
@override
_MyAppState createState() => _MyAppState();
}
class _MyAppState extends State<MyApp> {
List<int> inMemoryCache;
CacheController<List<int>> controller;
@override
void initState() {
super.initState();
var random = Random();
controller = SimpleCacheController<List<int>>(
// The fetcher just waits and then either crashes or returns a list of
// random numbers.
fetcher: () async {
await Future.delayed(Duration(seconds: 2));
if (random.nextDouble() < 0.8) {
return List.generate(random.nextInt(100), (i) => random.nextInt(10));
}
if (random.nextDouble() < 0.1) {
return [];
}
throw UnsupportedError('Oh no! Something terrible happened.');
},
loadFromCache: () async => throw NotInCacheException(),
saveToCache: (_) async {},
);
}
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(title: Text('Cached ListView examples')),
body: Builder(
builder: (context) {
return ListView(
children: <Widget>[
ListTile(
title: Text('CachedBuilder demo'),
onTap: () => Navigator.of(context).push(MaterialPageRoute(
builder: (_) => CachedBuilderDemo(
controller: controller,
),
)),
),
ListTile(
title: Text('CachedRawBuilder demo'),
onTap: () => Navigator.of(context).push(MaterialPageRoute(
builder: (_) => CachedRawBuilderDemo(
controller: controller,
),
)),
),
],
);
},
),
),
);
}
}