feat: 42kit Nav

feat: Animation Optimization

lib/common/utils/file_cache_utils.dart

@@ -0,0 +1,101 @@
+import 'dart:io';
+import 'package:flutter/foundation.dart';
+import 'package:path/path.dart' as path;
+import 'package:path_provider/path_provider.dart';
+import 'dart:convert';
+import 'package:crypto/crypto.dart';
+import 'package:starcitizen_doctor/common/io/rs_http.dart';
+
+class FileCacheUtils {
+  // 存储正在进行的下载任务
+  static final Map<String, Future<File>> _downloadingTasks = {};
+
+  // 缓存目录
+  static Directory? _cacheDir;
+
+  /// 获取缓存目录
+  static Future<Directory> _getCacheDirectory() async {
+    if (_cacheDir != null) return _cacheDir!;
+
+    final tempDir = await getTemporaryDirectory();
+    _cacheDir = Directory(path.join(tempDir.path, 'ScToolbox_File_Cache'));
+
+    if (!await _cacheDir!.exists()) {
+      await _cacheDir!.create(recursive: true);
+    }
+
+    return _cacheDir!;
+  }
+
+  /// 从URL获取文件，如果已经在下载中，则共享同一个下载任务
+  static Future<File> getFile(String url) async {
+    // 如果已经在下载中，直接返回正在进行的下载任务
+    if (_downloadingTasks.containsKey(url)) {
+      return _downloadingTasks[url]!;
+    }
+
+    final fileTask = _downloadFile(url);
+    _downloadingTasks[url] = fileTask;
+
+    try {
+      final file = await fileTask;
+      return file;
+    } finally {
+      // 无论成功失败，下载完成后从任务列表中移除
+      _downloadingTasks.remove(url);
+    }
+  }
+
+  /// 实际进行下载的方法
+  static Future<File> _downloadFile(String url) async {
+    // 生成文件名 (使用URL的MD5哈希作为文件名)
+    final filename = md5.convert(utf8.encode(url)).toString();
+    final cacheDir = await _getCacheDirectory();
+    final file = File(path.join(cacheDir.path, filename));
+
+    // 检查文件是否已经存在
+    if (await file.exists()) {
+      return file;
+    }
+
+    // 下载文件
+    final response = await RSHttp.get(url);
+
+    if (response.statusCode == 200) {
+      await file.writeAsBytes(response.data ?? []);
+      return file;
+    } else {
+      throw Exception('Failed to download file: ${response.statusCode}');
+    }
+  }
+
+  /// 清除特定URL的缓存
+  static Future<bool> clearCache(String url) async {
+    try {
+      final filename = md5.convert(utf8.encode(url)).toString();
+      final cacheDir = await _getCacheDirectory();
+      final file = File(path.join(cacheDir.path, filename));
+
+      if (await file.exists()) {
+        await file.delete();
+        return true;
+      }
+      return false;
+    } catch (e) {
+      return false;
+    }
+  }
+
+  /// 清除所有缓存
+  static Future<void> clearAllCache() async {
+    try {
+      final cacheDir = await _getCacheDirectory();
+      if (await cacheDir.exists()) {
+        await cacheDir.delete(recursive: true);
+        await cacheDir.create();
+      }
+    } catch (e) {
+      debugPrint('清除缓存失败: $e');
+    }
+  }
+}