111 lines
3.7 KiB
Dart
111 lines
3.7 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:cached_network_image/cached_network_image.dart';
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import 'package:logging/logging.dart';
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import 'package:path_provider/path_provider.dart';
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import 'package:flutter_cache_manager/flutter_cache_manager.dart';
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import 'dart:io' show Platform;
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class CacheImage extends StatelessWidget {
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final String imageUrl;
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const CacheImage({super.key, required this.imageUrl});
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Future<void> _downloadImage(BuildContext context) async {
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// 获取全局上下文
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final scaffoldContext = Navigator.of(context).context;
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try {
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if (!scaffoldContext.mounted) return;
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ScaffoldMessenger.of(scaffoldContext).showSnackBar(const SnackBar(content: Text('start to save image...')));
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// 从缓存中获取文件
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var fileInfo = await DefaultCacheManager().getFileFromCache(imageUrl);
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fileInfo ??= await DefaultCacheManager().downloadFile(imageUrl);
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if (Platform.isAndroid || Platform.isIOS) {
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// todo
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} else {
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// 获取下载目录
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final dir = await getDownloadsDirectory();
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if (dir == null) {
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throw Exception('cannot get download directory');
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}
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// 从URL中提取文件扩展名
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final extension = imageUrl.split('.').last.split('?').first;
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final fileName = 'image_${DateTime.now().millisecondsSinceEpoch}.$extension';
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final savePath = '${dir.path}/$fileName';
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// 复制文件
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await fileInfo.file.copy(savePath);
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if (!scaffoldContext.mounted) return;
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ScaffoldMessenger.of(scaffoldContext).showSnackBar(
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SnackBar(
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content: Text('image saved to download directory: $fileName'),
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action: SnackBarAction(
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label: 'ok',
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onPressed: () {
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ScaffoldMessenger.of(scaffoldContext).hideCurrentSnackBar();
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},
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),
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),
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);
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}
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} catch (e) {
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if (!scaffoldContext.mounted) return;
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Logger.root.severe('save image failed: $e');
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ScaffoldMessenger.of(scaffoldContext).showSnackBar(
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SnackBar(
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content: Text('save image failed: ${e.toString()}'),
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backgroundColor: Colors.red,
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action: SnackBarAction(label: 'retry', textColor: Colors.white, onPressed: () => _downloadImage(scaffoldContext)),
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),
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);
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}
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}
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@override
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Widget build(BuildContext context) {
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return GestureDetector(
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onTap: () => _showImagePreview(context),
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child: CachedNetworkImage(
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height: 200,
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imageUrl: imageUrl,
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placeholder: (context, url) => Container(height: 200, alignment: Alignment.center, child: const CircularProgressIndicator()),
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errorWidget: (context, url, error) => Container(height: 200, alignment: Alignment.center, child: const Icon(Icons.error)),
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fit: BoxFit.cover,
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),
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);
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}
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void _showImagePreview(BuildContext context) {
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showDialog(
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context: context,
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builder: (context) => Dialog(
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shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8.0)),
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child: Stack(
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children: [
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CachedNetworkImage(imageUrl: imageUrl, fit: BoxFit.contain),
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Positioned(
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right: 8,
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top: 8,
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child: Row(
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children: [
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IconButton(
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icon: const Icon(Icons.download, color: Colors.white),
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onPressed: () => _downloadImage(context),
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),
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IconButton(
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icon: const Icon(Icons.close, color: Colors.white),
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onPressed: () => Navigator.of(context).pop(),
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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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);
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}
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}
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