flutter_cached_svg 1.0.1 
flutter_cached_svg: ^1.0.1 copied to clipboard
Published 2 months ago • 
olicesona.com
olicesona.comA high-performance Flutter package for loading and caching SVG images from network URLs with full cross-platform support, including Flutter Web.
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';
import 'package:flutter_cached_svg/flutter_cached_svg.dart';
void main() {
runApp(const MyApp());
}
class MyApp extends StatelessWidget {
const MyApp({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Cached SVG Example',
theme: ThemeData(primarySwatch: Colors.blue, useMaterial3: true),
home: const ExampleHomePage(),
debugShowCheckedModeBanner: false,
);
}
}
class ExampleHomePage extends StatefulWidget {
const ExampleHomePage({Key? key}) : super(key: key);
@override
State<ExampleHomePage> createState() => _ExampleHomePageState();
}
class _ExampleHomePageState extends State<ExampleHomePage> {
// URLs d'exemple d'images SVG
static const List<String> svgUrls = [
// SVG simples et géométriques
'https://raw.githubusercontent.com/twitter/twemoji/master/assets/svg/1f60a.svg', // Emoji souriant
'https://raw.githubusercontent.com/twitter/twemoji/master/assets/svg/2764.svg', // Coeur rouge
'https://raw.githubusercontent.com/twitter/twemoji/master/assets/svg/1f31f.svg', // Étoile brillante
'https://raw.githubusercontent.com/twitter/twemoji/master/assets/svg/1f44d.svg', // Pouce en l'air
'https://raw.githubusercontent.com/twitter/twemoji/master/assets/svg/1f389.svg', // Confettis
'https://raw.githubusercontent.com/twitter/twemoji/master/assets/svg/1f3c6.svg', // Trophée
'https://raw.githubusercontent.com/twitter/twemoji/master/assets/svg/1f680.svg', // Fusée
'https://raw.githubusercontent.com/twitter/twemoji/master/assets/svg/1f4a1.svg', // Ampoule
// Icônes de logos via CDN (sans CORS)
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/github.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/google.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/microsoft.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/apple.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/amazon.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/netflix.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/spotify.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/youtube.svg',
// SVG techniques via JSDelivr
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/javascript.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/python.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/react.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/flutter.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/nodejs.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/typescript.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/docker.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/kubernetes.svg',
'https://heroicons.com/24/outline/heart.svg',
'https://heroicons.com/24/outline/star.svg',
'https://heroicons.com/24/outline/home.svg',
'https://heroicons.com/24/outline/user.svg',
'https://heroicons.com/24/outline/bell.svg',
'https://heroicons.com/24/outline/gift.svg',
'https://heroicons.com/24/outline/sun.svg',
'https://heroicons.com/24/outline/moon.svg',
'https://cdn.jsdelivr.net/npm/feather-icons@4.29.0/dist/icons/activity.svg',
'https://cdn.jsdelivr.net/npm/feather-icons@4.29.0/dist/icons/calendar.svg',
'https://cdn.jsdelivr.net/npm/feather-icons@4.29.0/dist/icons/camera.svg',
'https://cdn.jsdelivr.net/npm/feather-icons@4.29.0/dist/icons/coffee.svg',
'https://cdn.jsdelivr.net/npm/feather-icons@4.29.0/dist/icons/compass.svg',
'https://cdn.jsdelivr.net/npm/feather-icons@4.29.0/dist/icons/download.svg',
'https://cdn.jsdelivr.net/npm/feather-icons@4.29.0/dist/icons/globe.svg',
'https://cdn.jsdelivr.net/npm/feather-icons@4.29.0/dist/icons/mail.svg',
'https://raw.githubusercontent.com/twitter/twemoji/master/assets/svg/1f60a.svg', // 😊
'https://raw.githubusercontent.com/twitter/twemoji/master/assets/svg/1f389.svg', // 🎉
'https://raw.githubusercontent.com/twitter/twemoji/master/assets/svg/1f680.svg', // 🚀
'https://raw.githubusercontent.com/twitter/twemoji/master/assets/svg/1f4a1.svg', // 💡
// Simple Icons via JSDelivr (logos tech)
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/react.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/flutter.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/github.svg',
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/google.svg',
];
bool _isLoading = false;
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Flutter Cached SVG Example'),
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
actions: [
IconButton(
icon: const Icon(Icons.refresh),
onPressed: _clearAllCache,
tooltip: 'Clear All Cache',
),
],
),
body: Column(
children: [
// Buttons section
Container(
padding: const EdgeInsets.all(16),
child: Column(
children: [
Row(
children: [
Expanded(
child: ElevatedButton.icon(
onPressed: _isLoading ? null : _preCacheImages,
icon: _isLoading
? const SizedBox(
width: 16,
height: 16,
child: CircularProgressIndicator(
strokeWidth: 2,
),
)
: const Icon(Icons.download),
label: Text(
_isLoading ? 'Caching...' : 'Pre-cache All',
),
),
),
const SizedBox(width: 16),
Expanded(
child: ElevatedButton.icon(
onPressed: _clearAllCache,
icon: const Icon(Icons.clear_all),
label: const Text('Clear Cache'),
style: ElevatedButton.styleFrom(
backgroundColor: Colors.red,
foregroundColor: Colors.white,
),
),
),
],
),
const SizedBox(height: 16),
const Text(
'Tip: Images are cached automatically when loaded. '
'Try scrolling, then clearing cache and scrolling again to see the difference!',
style: TextStyle(fontSize: 12, color: Colors.grey),
textAlign: TextAlign.center,
),
],
),
),
// Grid section
Expanded(
child: GridView.builder(
padding: const EdgeInsets.all(16),
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: MediaQuery.of(context).size.width < 800 ? 2 : 4,
crossAxisSpacing: 16,
mainAxisSpacing: 16,
childAspectRatio: 1,
),
itemCount: svgUrls.length,
itemBuilder: (context, index) {
return _buildSvgCard(svgUrls[index], index);
},
),
),
],
),
floatingActionButton: FloatingActionButton(
onPressed: () {
Navigator.of(context).push(
MaterialPageRoute(
builder: (context) => const AdvancedExamplesPage(),
),
);
},
tooltip: 'Advanced Examples',
child: const Icon(Icons.arrow_forward),
),
);
}
Widget _buildSvgCard(String url, int index) {
return Card(
elevation: 4,
clipBehavior: Clip.antiAlias,
child: InkWell(
onTap: () => _showImageDialog(url, index),
child: Container(
padding: const EdgeInsets.all(16),
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Expanded(
child: FlutterCachedSvg(
url,
placeholder:
const Center(child: CupertinoActivityIndicator()),
errorWidget: const Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Icon(Icons.error, color: Colors.red, size: 32),
SizedBox(height: 8),
Text(
'Failed to load',
style: TextStyle(fontSize: 12),
textAlign: TextAlign.center,
),
],
),
),
width: 80,
height: 80,
fadeDuration: const Duration(milliseconds: 300),
),
),
const SizedBox(height: 8),
Text(
'SVG ${index + 1}',
style: const TextStyle(
fontSize: 12,
fontWeight: FontWeight.bold,
),
),
],
),
),
),
);
}
void _showImageDialog(String url, int index) {
showDialog(
context: context,
builder: (context) => Dialog(
child: Container(
padding: const EdgeInsets.all(20),
constraints: const BoxConstraints(maxWidth: 300, maxHeight: 400),
child: Column(
mainAxisSize: MainAxisSize.min,
children: [
Text(
'SVG ${index + 1}',
style: const TextStyle(
fontSize: 18,
fontWeight: FontWeight.bold,
),
),
const SizedBox(height: 16),
Expanded(
child: FlutterCachedSvg(
url,
placeholder: const Center(child: CircularProgressIndicator()),
errorWidget: const Center(
child: Icon(Icons.error, color: Colors.red, size: 48),
),
),
),
const SizedBox(height: 16),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
TextButton.icon(
onPressed: () async {
await FlutterCachedSvg.clearCacheForUrl(url);
if (mounted) {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text('Cache cleared for this image'),
),
);
}
},
icon: const Icon(Icons.clear),
label: const Text('Clear Cache'),
),
TextButton(
onPressed: () => Navigator.of(context).pop(),
child: const Text('Close'),
),
],
),
],
),
),
),
);
}
Future<void> _preCacheImages() async {
setState(() => _isLoading = true);
try {
for (String url in svgUrls) {
await FlutterCachedSvg.preCache(url);
}
if (mounted) {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text('All images pre-cached successfully!'),
backgroundColor: Colors.green,
),
);
}
} catch (e) {
if (mounted) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text('Error pre-caching: $e'),
backgroundColor: Colors.red,
),
);
}
} finally {
if (mounted) {
setState(() => _isLoading = false);
}
}
}
Future<void> _clearAllCache() async {
try {
await FlutterCachedSvg.clearCache();
if (mounted) {
ScaffoldMessenger.of(context).showSnackBar(
const SnackBar(
content: Text('All cache cleared!'),
backgroundColor: Colors.orange,
),
);
// Force rebuild to reload images
setState(() {});
}
} catch (e) {
if (mounted) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text('Error clearing cache: $e'),
backgroundColor: Colors.red,
),
);
}
}
}
}
// Advanced Examples Page
class AdvancedExamplesPage extends StatelessWidget {
const AdvancedExamplesPage({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Advanced Examples'),
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
),
body: ListView(
padding: const EdgeInsets.all(16),
children: [
_buildExampleCard(
'With Color Filter',
FlutterCachedSvg(
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/flutter.svg',
width: 60,
height: 60,
colorFilter:
const ColorFilter.mode(Colors.purple, BlendMode.srcIn),
placeholder: const CircularProgressIndicator(),
),
),
const SizedBox(height: 16),
_buildExampleCard(
'Different Fit Modes',
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Column(
children: [
Container(
width: 80,
height: 80,
decoration: BoxDecoration(
border: Border.all(color: Colors.grey),
),
child: FlutterCachedSvg(
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/flutter.svg',
fit: BoxFit.contain,
placeholder: const CircularProgressIndicator(),
),
),
const SizedBox(height: 8),
const Text('Contain', style: TextStyle(fontSize: 12)),
],
),
Column(
children: [
Container(
width: 80,
height: 80,
decoration: BoxDecoration(
border: Border.all(color: Colors.grey),
),
child: FlutterCachedSvg(
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/flutter.svg',
fit: BoxFit.cover,
placeholder: const CircularProgressIndicator(),
),
),
const SizedBox(height: 8),
const Text('Cover', style: TextStyle(fontSize: 12)),
],
),
Column(
children: [
Container(
width: 80,
height: 80,
decoration: BoxDecoration(
border: Border.all(color: Colors.grey),
),
child: FlutterCachedSvg(
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/flutter.svg',
fit: BoxFit.fill,
placeholder: const CircularProgressIndicator(),
),
),
const SizedBox(height: 8),
const Text('Fill', style: TextStyle(fontSize: 12)),
],
),
],
),
),
const SizedBox(height: 16),
_buildExampleCard(
'Custom Placeholder',
FlutterCachedSvg(
'https://cdn.jsdelivr.net/npm/simple-icons@v9/icons/flutter.svg',
width: 60,
height: 60,
placeholder: Container(
width: 60,
height: 60,
decoration: BoxDecoration(
color: Colors.grey[200],
borderRadius: BorderRadius.circular(8),
),
child: const Icon(Icons.image, color: Colors.grey),
),
),
),
const SizedBox(height: 16),
_buildExampleCard(
'Custom Error Widget',
FlutterCachedSvg(
'https://invalid-url.svg', // URL invalide pour démontrer l'erreur
width: 60,
height: 60,
errorWidget: Container(
width: 60,
height: 60,
decoration: BoxDecoration(
color: Colors.red[100],
borderRadius: BorderRadius.circular(8),
border: Border.all(color: Colors.red),
),
child: const Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Icon(Icons.broken_image, color: Colors.red),
Text(
'Failed',
style: TextStyle(fontSize: 10, color: Colors.red),
),
],
),
),
),
),
const SizedBox(height: 16),
_buildExampleCard(
'Slow Fade Animation',
FlutterCachedSvg(
'hhttps://cdn.jsdelivr.net/npm/simple-icons@v9/icons/flutter.svg',
width: 60,
height: 60,
fadeDuration: const Duration(
milliseconds: 1000,
), // Animation lente
placeholder: const CircularProgressIndicator(),
),
),
],
),
);
}
Widget _buildExampleCard(String title, Widget child) {
return Card(
child: Padding(
padding: const EdgeInsets.all(16),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
title,
style: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
),
const SizedBox(height: 12),
Center(child: child),
],
),
),
);
}
}Metadata
7
likes
135
points
59
downloads
Publisher
Weekly Downloads
Metadata
A high-performance Flutter package for loading and caching SVG images from network URLs with full cross-platform support, including Flutter Web.
Repository (GitHub)
View/report issues
Topics
#svg #cache #image #web #cross-platform
Documentation
License
BSD-3-Clause (license)
Dependencies
flutter, flutter_cache_manager, flutter_svg, http
