Add HistoryImageProvider

lib/components/comic.dart

@@ -164,6 +164,8 @@ class ComicTile extends StatelessWidget {
     ImageProvider image;
     if (comic is LocalComic) {
       image = LocalComicImageProvider(comic as LocalComic);
+    } else if (comic is History) {
+      image = HistoryImageProvider(comic as History);
     } else if (comic.sourceKey == 'local') {
       var localComic = LocalManager().find(comic.id, ComicType.local);
       if (localComic == null) {

lib/components/components.dart

@@ -19,6 +19,7 @@ import 'package:venera/foundation/consts.dart';
 import 'package:venera/foundation/favorites.dart';
 import 'package:venera/foundation/history.dart';
 import 'package:venera/foundation/image_provider/cached_image.dart';
+import 'package:venera/foundation/image_provider/history_image_provider.dart';
 import 'package:venera/foundation/image_provider/local_comic_image.dart';
 import 'package:venera/foundation/local.dart';
 import 'package:venera/foundation/res.dart';

lib/foundation/history.dart

@@ -2,7 +2,9 @@ import 'dart:async';
 
 import 'package:flutter/widgets.dart' show ChangeNotifier;
 import 'package:sqlite3/sqlite3.dart';
+import 'package:venera/foundation/comic_source/comic_source.dart';
 import 'package:venera/foundation/comic_type.dart';
+import 'package:venera/utils/translations.dart';
 
 import 'app.dart';
 
@@ -22,15 +24,18 @@ abstract mixin class HistoryMixin {
   HistoryType get historyType;
 }
 
-class History {
+class History implements Comic {
   HistoryType type;
 
   DateTime time;
 
+  @override
   String title;
 
+  @override
   String subtitle;
 
+  @override
   String cover;
   
   int ep;
@@ -44,6 +49,7 @@ class History {
   /// The number of episodes is 1-based.
   Set<int> readEpisode;
 
+  @override
   int? maxPage;
 
   History.fromModel(
@@ -137,6 +143,47 @@ class History {
 
   @override
   int get hashCode => Object.hash(id, type);
+
+  @override
+  String get description {
+    var res = "";
+    if (ep >= 1) {
+      res += "Chapter @ep".tlParams({
+        "ep": ep,
+      });
+    }
+    if (page >= 1) {
+      if (ep >= 1) {
+        res += " - ";
+      }
+      res += "Page @page".tlParams({
+        "page": page,
+      });
+    }
+    return res;
+  }
+
+  @override
+  String? get favoriteId => null;
+
+  @override
+  String? get language => null;
+
+  @override
+  String get sourceKey => type == ComicType.local
+      ? 'local'
+      : type.comicSource?.key ?? "Unknown:${type.value}";
+
+  @override
+  double? get stars => null;
+
+  @override
+  List<String>? get tags => null;
+
+  @override
+  Map<String, dynamic> toJson() {
+    throw UnimplementedError();
+  }
 }
 
 class HistoryManager with ChangeNotifier {

lib/foundation/image_provider/history_image_provider.dart

@@ -0,0 +1,57 @@
+import 'dart:async' show Future, StreamController;
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:venera/foundation/local.dart';
+import 'package:venera/network/images.dart';
+import '../history.dart';
+import 'base_image_provider.dart';
+import 'history_image_provider.dart' as image_provider;
+
+class HistoryImageProvider
+    extends BaseImageProvider<image_provider.HistoryImageProvider> {
+  /// Image provider for normal image.
+  ///
+  /// [url] is the url of the image. Local file path is also supported.
+  const HistoryImageProvider(this.history);
+
+  final History history;
+
+  @override
+  Future<Uint8List> load(StreamController<ImageChunkEvent> chunkEvents) async {
+    var url = history.cover;
+    if (!url.contains('/')) {
+      var localComic = LocalManager().find(history.id, history.type);
+      if (localComic != null) {
+        return localComic.coverFile.readAsBytes();
+      }
+      var comicSource =
+          history.type.comicSource ?? (throw "Comic source not found.");
+      var comic = await comicSource.loadComicInfo!(history.id);
+      url = comic.data.cover;
+      history.cover = url;
+      HistoryManager().addHistory(history);
+    }
+    await for (var progress in ImageDownloader.loadThumbnail(
+      url,
+      history.type.sourceKey,
+      history.id,
+    )) {
+      chunkEvents.add(ImageChunkEvent(
+        cumulativeBytesLoaded: progress.currentBytes,
+        expectedTotalBytes: progress.totalBytes,
+      ));
+      if (progress.imageBytes != null) {
+        return progress.imageBytes!;
+      }
+    }
+    throw "Error: Empty response body.";
+  }
+
+  @override
+  Future<HistoryImageProvider> obtainKey(ImageConfiguration configuration) {
+    return SynchronousFuture(this);
+  }
+
+  @override
+  String get key => "history${history.id}${history.type.value}";
+}

lib/pages/history_page.dart

@@ -78,33 +78,7 @@ class _HistoryPageState extends State<HistoryPage> {
             ],
           ),
           SliverGridComics(
-            comics: comics.map(
-              (e) {
-                var cover = e.cover;
-                if (!cover.isURL) {
-                  var localComic = LocalManager().find(
-                    e.id,
-                    e.type,
-                  );
-                  if(localComic != null) {
-                    cover = "file://${localComic.coverFile.path}";
-                  }
-                }
-                return Comic(
-                  e.title,
-                  cover,
-                  e.id,
-                  e.subtitle,
-                  null,
-                  getDescription(e),
-                  e.type == ComicType.local
-                      ? 'local'
-                      : e.type.comicSource?.key ?? "Unknown:${e.type.value}",
-                  null,
-                  null,
-                );
-              },
-            ).toList(),
+            comics: comics,
             badgeBuilder: (c) {
               return ComicSource.find(c.sourceKey)?.name;
             },

lib/pages/home_page.dart

@@ -7,6 +7,7 @@ import 'package:venera/foundation/consts.dart';
 import 'package:venera/foundation/favorites.dart';
 import 'package:venera/foundation/history.dart';
 import 'package:venera/foundation/image_provider/cached_image.dart';
+import 'package:venera/foundation/image_provider/history_image_provider.dart';
 import 'package:venera/foundation/image_provider/local_comic_image.dart';
 import 'package:venera/foundation/local.dart';
 import 'package:venera/pages/accounts_page.dart';
@@ -265,21 +266,6 @@ class _HistoryState extends State<_History> {
                     scrollDirection: Axis.horizontal,
                     itemCount: history.length,
                     itemBuilder: (context, index) {
-                      var cover = history[index].cover;
-                      ImageProvider imageProvider = CachedImageProvider(
-                        cover,
-                        sourceKey: history[index].type.comicSource?.key,
-                        cid: history[index].id,
-                      );
-                      if (!cover.isURL) {
-                        var localComic = LocalManager().find(
-                          history[index].id,
-                          history[index].type,
-                        );
-                        if (localComic != null) {
-                          imageProvider = FileImage(localComic.coverFile);
-                        }
-                      }
                       return InkWell(
                         onTap: () {
                           context.to(
@@ -302,7 +288,7 @@ class _HistoryState extends State<_History> {
                           ),
                           clipBehavior: Clip.antiAlias,
                           child: AnimatedImage(
-                            image: imageProvider,
+                            image: HistoryImageProvider(history[index]),
                             width: 96,
                             height: 128,
                             fit: BoxFit.cover,