feat: 防止下载的文件在清空缓存时被清除

Author: GeekTR

lib/screen/cache_manager.dart

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:io';
 
 import 'package:alist/l10n/intl_keys.dart';
+import 'package:alist/util/download/download_manager.dart';
 import 'package:alist/widget/alist_scaffold.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_smart_dialog/flutter_smart_dialog.dart';
@@ -60,6 +61,7 @@ class CacheManagerController extends GetxController {
 
   final Set<String> _imageCachePaths = {};
   final Set<String> _audioCachePaths = {};
+  String _downloadDir = "";
 
   @override
   void onInit() {
@@ -69,6 +71,7 @@ class CacheManagerController extends GetxController {
 
   void _calculateCacheFilesSize() async {
     var temporaryDirectory = await getTemporaryDirectory();
+    _downloadDir = (await DownloadManager.acquireDownloadDirectory()).path;
     if (isClosed) {
       return;
     }
@@ -100,6 +103,8 @@ class CacheManagerController extends GetxController {
         } else if (_checkIsAudioPath(path)) {
           _audioCacheSize += filesSize;
           audioCacheSizeStr.value = _formatBytes(_audioCacheSize);
+        } else if (path.startsWith(_downloadDir)) {
+          // do nothing
         } else {
           _otherCacheSize += filesSize;
           debugPrint(entity.path);
@@ -214,6 +219,7 @@ class CacheManagerController extends GetxController {
     var excludePaths = <String>[];
     excludePaths.addAll(_imageCachePaths);
     excludePaths.addAll(_audioCachePaths);
+    excludePaths.add(_downloadDir);
     await _deleteFilesByDirectory(temporaryDirectory,
         excludePaths: excludePaths);
 

lib/util/download/download_manager.dart

@@ -330,10 +330,10 @@ class DownloadManager {
       if (dirs != null) {
         downloadDir = dirs;
       } else {
-        downloadDir = await getTemporaryDirectory();
+        downloadDir = await acquireDownloadDirectory();
       }
     } else {
-      downloadDir = await getTemporaryDirectory();
+      downloadDir = await acquireDownloadDirectory();
     }
     String subPath = userController.user().baseUrl.md5String();
     final username = userController.user().username;
@@ -346,6 +346,13 @@ class DownloadManager {
     return downloadDir;
   }
 
+  static Future<Directory> acquireDownloadDirectory() async {
+    Directory downloadDir = await getTemporaryDirectory();
+    downloadDir = Directory("${downloadDir.path}/Downloads");
+    await downloadDir.create();
+    return downloadDir;
+  }
+
   DownloadTask? findTaskBySavedPath(String path) {
     var task = _runningTasks
         .firstWhereOrNull((element) => element.record.localPath == path);