Show cached size in settings page

lib/l10n/app_en.arb

@@ -26,7 +26,7 @@
     "showNsfw": "Show NSFW image by default",
     "read": "Read",
     "download": "Download",
-    "colon": ":",
+    "colon": ": ",
     "copyImage": "Copy image to clipboard",
     "copyImgUrl": "Copy image URL to clipboard",
     "retry": "Retry",
@@ -196,5 +196,9 @@
     "refresh": "Refresh",
     "originalImg": "Original image",
     "overwriteDefaultConfig": "Overwrite default config",
-    "enableImageCache": "Cache images to disk."
+    "enableImageCache": "Cache images to disk.",
+    "cachedFileSize": "Cached file size",
+    "update": "Update",
+    "updateFileSize": "Update file size",
+    "clearCaches": "Clear caches"
 }

lib/l10n/app_zh.arb

@@ -196,5 +196,9 @@
     "refresh": "刷新",
     "originalImg": "原图",
     "overwriteDefaultConfig": "覆盖默认设置",
-    "enableImageCache": "将图片缓存到本地硬盘。"
+    "enableImageCache": "将图片缓存到本地硬盘。",
+    "cachedFileSize": "已缓存文件大小",
+    "update": "更新",
+    "updateFileSize": "更新文件大小",
+    "clearCaches": "清除缓存"
 }

lib/platform/image_cache_io.dart

@@ -31,6 +31,8 @@ class ImageCaches {
   final Set<String> _existingTable = {};
   bool _inited = false;
   static const version = 1;
+  int _size = 0;
+  int get size => _size;
   ImageCaches();
   Future<String?> _desktopFilePath() async {
     final String? exe = await platformPath.getCurrentExe();
@@ -123,11 +125,42 @@ class ImageCaches {
     await _db!.execute("VACUUM;");
   }
 
+  Future<void> _removeUnexist() async {
+    List<String> needDeleted = [];
+    int offset = 0;
+    late List<Map<String, Object?>> records;
+    do {
+      records = await _db!.query("images",
+          columns: ["url", "path"], limit: 100, offset: offset);
+      for (final record in records) {
+        final url = record["url"] as String;
+        var p = record["path"] as String;
+        if (_exeDir != null && path.isRelative(p)) {
+          p = path.join(_exeDir!, p);
+        }
+        final f = _fs.file(p);
+        try {
+          if (!await f.exists()) {
+            needDeleted.add(url);
+          }
+        } catch (e) {
+          _log.warning("Failed to check $p is exists or not. Url: $url");
+        }
+      }
+      offset += records.length;
+    } while (records.isNotEmpty);
+    for (final url in needDeleted) {
+      await _db!.delete("images", where: "url = ?", whereArgs: [url]);
+    }
+    if (needDeleted.isNotEmpty) await _optimize();
+  }
+
   Future<void> init() async {
     sqfliteFfiInit();
     _db = await databaseFactoryFfi.openDatabase(await _filePath);
     await _createDir();
     if (!(await _checkDatabase())) await _createTable();
+    await updateSize();
     _inited = true;
   }
 
@@ -186,8 +219,45 @@ class ImageCaches {
     if (_exeDir != null) {
       p = path.relative(p, from: _exeDir!);
     }
+    final exes = await _db!.query("images", where: 'url = ?', whereArgs: [uri]);
     await _db!.rawInsert(
         "INSERT OR REPLACE INTO images VALUES (?, ?, ?, ?, ?, ?);",
         [uri, p, lastUsed, header, realUri, data.length]);
+    if (exes.isEmpty) {
+      _size += data.length;
+    } else {
+      final originalSize = (exes[0]["size"] as int?) ?? 0;
+      _size += (data.length - originalSize);
+    }
+  }
+
+  Future<void> updateSize({bool clear = false}) async {
+    if (clear) await _removeUnexist();
+    final re = await _db!.rawQuery("SELECT SUM(size) AS sizes FROM images;");
+    _size = re[0]["sizes"] as int;
+  }
+
+  Future<void> clear() async {
+    int offset = 0;
+    late List<Map<String, Object?>> records;
+    do {
+      records = await _db!
+          .query("images", columns: ["path"], limit: 100, offset: offset);
+      for (final record in records) {
+        var p = record["path"] as String;
+        if (_exeDir != null && path.isRelative(p)) {
+          p = path.join(_exeDir!, p);
+        }
+        final f = _fs.file(p);
+        try {
+          await f.delete();
+        } catch (e) {
+          _log.warning("Failed to delete $p");
+        }
+      }
+      offset += records.length;
+    } while (records.isNotEmpty);
+    await _db!.delete("images");
+    _size = 0;
   }
 }

lib/platform/image_cache_web.dart

@@ -6,6 +6,8 @@ import 'package:web/web.dart';
 class ImageCaches {
   Cache? cache;
   ImageCaches();
+  int _size = 0;
+  int get size => _size;
   Future<void> init() async {
     cache = await window.caches.open("image_caches").toDart;
   }
@@ -42,4 +44,7 @@ class ImageCaches {
     final res = Response(data.toJS, opts);
     await cache!.put(uri.toJS, res).toDart;
   }
+
+  Future<void> updateSize({bool clear = false}) async {}
+  Future<void> clear() async {}
 }

lib/settings.dart

@@ -5,6 +5,7 @@ import 'package:logging/logging.dart';
 import 'globals.dart';
 import 'main.dart';
 import 'utils.dart';
+import 'utils/filesize.dart';
 
 final _log = Logger("SettingsPage");
 
@@ -200,10 +201,57 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
     return re;
   }
 
+  Widget _buildCache(BuildContext context) {
+    final i18n = AppLocalizations.of(context)!;
+    final text = SelectableText(
+        "${i18n.cachedFileSize}${i18n.colon}${getFileSize(imageCaches.size)}");
+    final button = ElevatedButton(
+        onPressed: () {
+          imageCaches.updateSize(clear: true).then((_) {
+            setState(() {});
+          }).onError((e, _) {
+            _log.warning("Failed to update image cache size: $e");
+            return null;
+          });
+        },
+        child: Text(i18n.updateFileSize));
+    final cButton = Container(
+        padding: const EdgeInsets.only(left: 8),
+        child: ElevatedButton(
+            onPressed: () {
+              imageCaches.clear().then((_) {
+                setState(() {});
+              }).onError((e, _) {
+                _log.warning("Failed to clear image cache: $e");
+                return null;
+              });
+            },
+            child: Text(i18n.clearCaches)));
+    final maxWidth = MediaQuery.of(context).size.width;
+    final useTwoLine = maxWidth <= 500 ? true : false;
+    return Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
+      CheckboxMenuButton(
+        value: _enableImageCache,
+        onChanged: (bool? value) {
+          if (value != null) {
+            setState(() {
+              _enableImageCache = value;
+            });
+          }
+        },
+        child: Text(i18n.enableImageCache),
+      ),
+      Container(
+          padding: const EdgeInsets.only(left: 6, top: 4),
+          child: useTwoLine ? text : Row(children: [text, button, cButton])),
+      useTwoLine ? Row(children: [button, cButton]) : Container(),
+    ]);
+  }
+
   @override
   Widget build(BuildContext context) {
-    setCurrentTitle(AppLocalizations.of(context)!.settings,
-        Theme.of(context).primaryColor.value);
+    final i18n = AppLocalizations.of(context)!;
+    setCurrentTitle(i18n.settings, Theme.of(context).primaryColor.value);
     return Scaffold(
         appBar: AppBar(
           leading: IconButton(
@@ -213,7 +261,7 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
             },
             icon: const Icon(Icons.arrow_back),
           ),
-          title: Text(AppLocalizations.of(context)!.settings),
+          title: Text(i18n.settings),
           actions: [
             buildThemeModeIcon(context),
             buildMoreVertSettingsButon(context),
@@ -245,14 +293,12 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
                                       MainApp.of(context).changeLang(_lang);
                                     }
                                   },
-                                  label:
-                                      Text(AppLocalizations.of(context)!.lang),
+                                  label: Text(i18n.lang),
                                   dropdownMenuEntries: Lang.values
                                       .map((e) => DropdownMenuEntry(
                                           value: e,
                                           label: e == Lang.system
-                                              ? AppLocalizations.of(context)!
-                                                  .systemLang
+                                              ? i18n.systemLang
                                               : e.langName))
                                       .toList(),
                                   leadingIcon: const Icon(Icons.language),
@@ -269,8 +315,7 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
                                       });
                                     }
                                   },
-                                  child: Text(AppLocalizations.of(context)!
-                                      .useTitleJpn),
+                                  child: Text(i18n.useTitleJpn),
                                 )),
                             Container(
                               padding: const EdgeInsets.symmetric(vertical: 8),
@@ -283,8 +328,7 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
                                     });
                                   }
                                 },
-                                child: Text(
-                                    AppLocalizations.of(context)!.showNsfw),
+                                child: Text(i18n.showNsfw),
                               ),
                             ),
                             Container(
@@ -298,8 +342,7 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
                                     });
                                   }
                                 },
-                                child: Text(
-                                    AppLocalizations.of(context)!.displayAd),
+                                child: Text(i18n.displayAd),
                               ),
                             ),
                             Container(
@@ -313,8 +356,7 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
                                     });
                                   }
                                 },
-                                child: Text(AppLocalizations.of(context)!
-                                    .showTranslatedTag),
+                                child: Text(i18n.showTranslatedTag),
                               ),
                             ),
                             isAndroid || isWindows
@@ -330,8 +372,7 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
                                           });
                                         }
                                       },
-                                      child: Text(AppLocalizations.of(context)!
-                                          .preventScreenCapture),
+                                      child: Text(i18n.preventScreenCapture),
                                     ),
                                   )
                                 : Container(),
@@ -346,24 +387,12 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
                                     });
                                   }
                                 },
-                                child: Text(AppLocalizations.of(context)!
-                                    .dlUseAvgSpeed),
+                                child: Text(i18n.dlUseAvgSpeed),
                               ),
                             ),
                             Container(
                               padding: const EdgeInsets.symmetric(vertical: 8),
-                              child: CheckboxMenuButton(
-                                value: _enableImageCache,
-                                onChanged: (bool? value) {
-                                  if (value != null) {
-                                    setState(() {
-                                      _enableImageCache = value;
-                                    });
-                                  }
-                                },
-                                child: Text(AppLocalizations.of(context)!
-                                    .enableImageCache),
-                              ),
+                              child: _buildCache(context),
                             ),
                             Row(
                               mainAxisAlignment: MainAxisAlignment.center,
@@ -375,9 +404,7 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
                                         onPressed: () {
                                           reset(context);
                                         },
-                                        child: Text(
-                                            AppLocalizations.of(context)!
-                                                .reset))),
+                                        child: Text(i18n.reset))),
                                 Padding(
                                     padding: const EdgeInsets.symmetric(
                                         horizontal: 8),
@@ -385,8 +412,7 @@ class _SettingsPage extends State<SettingsPage> with ThemeModeWidget {
                                       onPressed: () {
                                         save();
                                       },
-                                      child: Text(
-                                          AppLocalizations.of(context)!.save),
+                                      child: Text(i18n.save),
                                     ))
                               ],
                             ),