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ivan2282
266
lib/image_cache_service.dart
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266
lib/image_cache_service.dart
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import 'dart:io';
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import 'dart:typed_data';
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import 'package:flutter/material.dart';
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import 'package:path_provider/path_provider.dart';
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import 'package:path/path.dart' as path;
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import 'package:http/http.dart' as http;
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import 'package:cached_network_image/cached_network_image.dart';
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class ImageCacheService {
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ImageCacheService._privateConstructor();
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static final ImageCacheService instance =
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ImageCacheService._privateConstructor();
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static const String _cacheDirectoryName = 'image_cache';
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static const Duration _cacheExpiration = Duration(
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days: 7,
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); // Кеш изображений на 7 дней
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late Directory _cacheDirectory;
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Future<void> initialize() async {
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final appDir = await getApplicationDocumentsDirectory();
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_cacheDirectory = Directory(path.join(appDir.path, _cacheDirectoryName));
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if (!_cacheDirectory.existsSync()) {
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await _cacheDirectory.create(recursive: true);
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}
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await _cleanupExpiredCache();
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}
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String getCachedImagePath(String url) {
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final fileName = _generateFileName(url);
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return path.join(_cacheDirectory.path, fileName);
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}
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bool isImageCached(String url) {
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final file = File(getCachedImagePath(url));
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return file.existsSync();
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}
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Future<File?> loadImage(String url, {bool forceRefresh = false}) async {
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if (!forceRefresh && isImageCached(url)) {
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final cachedFile = File(getCachedImagePath(url));
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if (await _isFileValid(cachedFile)) {
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return cachedFile;
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} else {
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await cachedFile.delete();
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}
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}
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try {
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final response = await http.get(Uri.parse(url));
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if (response.statusCode == 200) {
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final file = File(getCachedImagePath(url));
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await file.writeAsBytes(response.bodyBytes);
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await _updateFileAccessTime(file);
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return file;
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}
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} catch (e) {
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print('Ошибка загрузки изображения $url: $e');
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}
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return null;
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}
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Future<Uint8List?> loadImageAsBytes(
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String url, {
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bool forceRefresh = false,
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}) async {
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final file = await loadImage(url, forceRefresh: forceRefresh);
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if (file != null) {
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return await file.readAsBytes();
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}
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return null;
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}
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Future<void> preloadImage(String url) async {
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await loadImage(url);
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}
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Future<void> preloadContactAvatar(String? photoUrl) async {
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if (photoUrl != null && photoUrl.isNotEmpty) {
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await preloadImage(photoUrl);
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}
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}
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Future<void> preloadProfileAvatar(String? photoUrl) async {
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if (photoUrl != null && photoUrl.isNotEmpty) {
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await preloadImage(photoUrl);
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}
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}
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Future<void> preloadContactAvatars(List<String?> photoUrls) async {
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final futures = photoUrls
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.where((url) => url != null && url.isNotEmpty)
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.map((url) => preloadImage(url!))
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.toList();
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if (futures.isNotEmpty) {
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await Future.wait(futures);
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}
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}
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Future<void> clearCache() async {
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if (_cacheDirectory.existsSync()) {
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await _cacheDirectory.delete(recursive: true);
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await _cacheDirectory.create(recursive: true);
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}
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}
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Future<int> getCacheSize() async {
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int totalSize = 0;
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if (_cacheDirectory.existsSync()) {
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await for (final entity in _cacheDirectory.list(recursive: true)) {
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if (entity is File) {
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totalSize += await entity.length();
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}
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}
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}
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return totalSize;
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}
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Future<int> getCacheFileCount() async {
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int count = 0;
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if (_cacheDirectory.existsSync()) {
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await for (final entity in _cacheDirectory.list(recursive: true)) {
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if (entity is File) {
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count++;
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}
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}
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}
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return count;
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}
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Future<void> _cleanupExpiredCache() async {
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if (!_cacheDirectory.existsSync()) return;
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await for (final entity in _cacheDirectory.list(recursive: true)) {
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if (entity is File && await _isFileExpired(entity)) {
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await entity.delete();
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}
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}
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}
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Future<bool> _isFileValid(File file) async {
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if (!file.existsSync()) return false;
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final stat = await file.stat();
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final age = DateTime.now().difference(stat.modified);
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return age < _cacheExpiration;
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}
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Future<bool> _isFileExpired(File file) async {
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if (!file.existsSync()) return false;
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final stat = await file.stat();
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final age = DateTime.now().difference(stat.modified);
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return age >= _cacheExpiration;
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}
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Future<void> _updateFileAccessTime(File file) async {
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try {
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await file.setLastModified(DateTime.now());
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} catch (e) {
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}
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}
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String _generateFileName(String url) {
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final hash = url.hashCode.abs().toString();
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final extension = path.extension(url).isNotEmpty
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? path.extension(url)
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: '.jpg'; // По умолчанию jpg
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return '$hash$extension';
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}
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Future<Map<String, dynamic>> getCacheStats() async {
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final size = await getCacheSize();
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final fileCount = await getCacheFileCount();
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return {
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'cache_size_bytes': size,
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'cache_size_mb': (size / (1024 * 1024)).toStringAsFixed(2),
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'file_count': fileCount,
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'cache_directory': _cacheDirectory.path,
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};
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}
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}
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extension CachedImageExtension on String {
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Widget getCachedNetworkImage({
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Key? key,
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double? width,
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double? height,
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BoxFit? fit,
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Widget? placeholder,
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Widget? errorWidget,
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Duration? fadeInDuration,
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bool useMemoryCache = true,
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}) {
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return CachedNetworkImage(
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key: key,
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imageUrl: this,
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width: width,
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height: height,
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fit: fit,
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placeholder: (context, url) =>
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placeholder ??
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Container(
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width: width,
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height: height,
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color: Colors.grey[300],
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child: const Icon(Icons.image, color: Colors.grey),
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),
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errorWidget: (context, url, error) =>
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errorWidget ??
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Container(
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width: width,
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height: height,
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color: Colors.grey[300],
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child: const Icon(Icons.broken_image, color: Colors.grey),
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),
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fadeInDuration: fadeInDuration ?? const Duration(milliseconds: 300),
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useOldImageOnUrlChange: true,
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memCacheWidth: useMemoryCache ? (width ?? 200).toInt() : null,
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memCacheHeight: useMemoryCache ? (height ?? 200).toInt() : null,
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);
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}
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Future<void> preloadImage() async {
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await ImageCacheService.instance.loadImage(this);
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}
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}
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