improve ui

lib/foundation/history.dart

@@ -153,6 +153,8 @@ class HistoryManager with ChangeNotifier {
 
   Map<String, bool>? _cachedHistory;
 
+  static const _kMaxHistoryLength = 200;
+
   Future<void> init() async {
     _db = sqlite3.open("${App.dataPath}/history.db");
 
@@ -176,6 +178,12 @@ class HistoryManager with ChangeNotifier {
   ///
   /// This function would be called when user start reading.
   Future<void> addHistory(History newItem) async {
+    while(count() >= _kMaxHistoryLength) {
+      _db.execute("""
+        delete from history
+        where time == (select min(time) from history);
+      """);
+    }
     _db.execute("""
         insert or replace into history (id, title, subtitle, cover, time, type, ep, page, readEpisode, max_page)
         values (?, ?, ?, ?, ?, ?, ?, ?, ?, ?);
@@ -207,6 +215,7 @@ class HistoryManager with ChangeNotifier {
       where id == ? and type == ?;
     """, [id, type.value]);
     updateCache();
+    notifyListeners();
   }
 
   Future<History?> find(String id, ComicType type) async {