223 lines
8.5 KiB
Dart
223 lines
8.5 KiB
Dart
import 'dart:convert';
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import 'package:flutter/material.dart';
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import 'package:http_get_cache/http_get_cache.dart';
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import 'package:http_get_cache/http_get_cache_flutter.dart';
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import 'package:http_get_cache/http_image_provider.dart';
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import 'package:signals/signals_flutter.dart';
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void main() async {
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WidgetsFlutterBinding.ensureInitialized();
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await initFlutterHttpGetCache();
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runApp(const MainApp());
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}
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class MainApp extends StatefulWidget {
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const MainApp({super.key});
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@override
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State<MainApp> createState() => _MainAppState();
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}
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class _MainAppState extends State<MainApp> {
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final client = httpClient();
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static const target = 'https://jsonplaceholder.typicode.com/photos';
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final requestCount$ = signal(0);
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// We limit to 50 items for the demo to keep it snappy and focused
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late final items$ = client
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.get(Uri.parse(target))
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.then((res) => res.statusCode == 200 ? jsonDecode(res.body) as List : [])
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.then((items) => items.take(50).cast<Map<String, Object?>>().toList())
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.then(
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(r) => () {
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requestCount$.value++;
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return r;
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}(),
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)
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.toFutureSignal();
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@override
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Widget build(BuildContext context) {
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final state = items$.watch(context);
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final count = requestCount$.watch(context);
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return MaterialApp(
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debugShowCheckedModeBanner: false,
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themeMode: ThemeMode.system,
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theme: ThemeData(
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useMaterial3: true,
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colorScheme: ColorScheme.fromSeed(
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seedColor: const Color(0xFF6750A4),
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brightness: Brightness.light,
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),
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),
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darkTheme: ThemeData(
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useMaterial3: true,
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colorScheme: ColorScheme.fromSeed(
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seedColor: const Color(0xFFD0BCFF),
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brightness: Brightness.dark,
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),
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),
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home: Scaffold(
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body: CustomScrollView(
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slivers: [
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SliverAppBar.large(
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title: const Text('Http Get Cache'),
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actions: [
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Center(
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child: Padding(
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padding: const EdgeInsets.symmetric(horizontal: 16.0),
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child: Badge(
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label: Text('$count'),
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child: const Icon(Icons.cloud_sync_outlined),
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),
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),
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),
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],
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),
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state.map(
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data: (items) {
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if (items.isEmpty) {
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return const SliverFillRemaining(
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child: Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Icon(Icons.inbox_outlined,
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size: 64, color: Colors.grey),
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SizedBox(height: 16),
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Text(
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'No items found',
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style: TextStyle(fontSize: 18, color: Colors.grey),
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),
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],
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),
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),
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);
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}
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return SliverPadding(
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padding: const EdgeInsets.all(16.0),
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sliver: SliverGrid(
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gridDelegate:
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const SliverGridDelegateWithMaxCrossAxisExtent(
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maxCrossAxisExtent: 300,
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mainAxisSpacing: 16,
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crossAxisSpacing: 16,
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childAspectRatio: 0.8,
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),
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delegate: SliverChildBuilderDelegate(
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(context, index) {
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final item = items[index];
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final title = item['title'] as String;
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final url = item['url'] as String;
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// Use a deterministic random height for a staggered-like feel if we were using masonry,
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// but for standard grid, we keep uniform aspect ratio.
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// We'll use the ID to pick a color for the placeholder.
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final id = item['id'] as int;
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final color =
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Colors.primaries[id % Colors.primaries.length];
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return Card(
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elevation: 2,
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clipBehavior: Clip.antiAlias,
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child: Stack(
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fit: StackFit.expand,
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children: [
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Image(
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image: HttpImageProvider(
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Uri.parse(url),
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client: client,
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),
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fit: BoxFit.cover,
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loadingBuilder:
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(context, child, loadingProgress) {
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if (loadingProgress == null) return child;
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return Container(
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color: color.withValues(alpha: 0.1),
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child: const Center(
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child: CircularProgressIndicator(),
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),
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);
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},
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errorBuilder: (context, error, stackTrace) {
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return Container(
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color: color.withValues(alpha: 0.2),
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child: const Icon(
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Icons.broken_image_outlined,
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size: 48),
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);
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},
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),
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Positioned(
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bottom: 0,
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left: 0,
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right: 0,
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child: Container(
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decoration: const BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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colors: [
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Colors.transparent,
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Colors.black87,
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],
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),
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),
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padding: const EdgeInsets.all(12.0),
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child: Text(
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title,
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style: const TextStyle(
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color: Colors.white,
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fontWeight: FontWeight.bold,
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),
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maxLines: 2,
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overflow: TextOverflow.ellipsis,
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),
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),
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),
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],
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),
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);
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},
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childCount: items.length,
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),
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),
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);
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},
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error: (error) => SliverFillRemaining(
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child: Center(
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Icon(Icons.error_outline,
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size: 64, color: Colors.red),
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const SizedBox(height: 16),
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Text('Error: $error', textAlign: TextAlign.center),
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const SizedBox(height: 16),
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FilledButton.icon(
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onPressed: () => items$.refresh(),
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icon: const Icon(Icons.refresh),
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label: const Text('Retry'),
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),
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],
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),
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),
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),
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loading: () => const SliverFillRemaining(
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child: Center(child: CircularProgressIndicator()),
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),
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),
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],
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),
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floatingActionButton: FloatingActionButton.extended(
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onPressed: () => items$.refresh(),
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icon: const Icon(Icons.refresh),
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label: const Text('Refresh Data'),
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),
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),
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);
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}
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}
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