make explore pages keep alive and listen for settings change

lib/components/comic.dart

@@ -872,6 +872,7 @@ class ComicListState extends State<ComicList> {
     try {
       if (widget.loadPage != null) {
         var res = await widget.loadPage!(page);
+        if(!mounted) return;
         if (res.success) {
           if (res.data.isEmpty) {
             _data[page] = const [];

lib/foundation/appdata.dart

@@ -1,5 +1,6 @@
 import 'dart:convert';
 
+import 'package:flutter/foundation.dart';
 import 'package:path_provider/path_provider.dart';
 import 'package:venera/foundation/app.dart';
 import 'package:venera/utils/io.dart';
@@ -85,7 +86,7 @@ class _Appdata {
 
 final appdata = _Appdata();
 
-class _Settings {
+class _Settings with ChangeNotifier {
   _Settings();
 
   final _data = <String, dynamic>{
@@ -117,6 +118,7 @@ class _Settings {
 
   operator []=(String key, dynamic value) {
     _data[key] = value;
+    notifyListeners();
   }
 
   @override

lib/pages/explore_page.dart

@@ -5,6 +5,7 @@ import 'package:venera/foundation/appdata.dart';
 import 'package:venera/foundation/comic_source/comic_source.dart';
 import 'package:venera/foundation/res.dart';
 import 'package:venera/foundation/state_controller.dart';
+import 'package:venera/utils/ext.dart';
 import 'package:venera/utils/translations.dart';
 
 class ExplorePage extends StatefulWidget {
@@ -15,7 +16,7 @@ class ExplorePage extends StatefulWidget {
 }
 
 class _ExplorePageState extends State<ExplorePage>
-    with TickerProviderStateMixin {
+    with TickerProviderStateMixin, AutomaticKeepAliveClientMixin<ExplorePage> {
   late TabController controller;
 
   bool showFB = true;
@@ -24,6 +25,24 @@ class _ExplorePageState extends State<ExplorePage>
 
   late List<String> pages;
 
+  void onSettingsChanged() {
+    var explorePages = List<String>.from(appdata.settings["explore_pages"]);
+    var all = ComicSource.all()
+        .map((e) => e.explorePages)
+        .expand((e) => e.map((e) => e.title))
+        .toList();
+    explorePages = explorePages.where((e) => all.contains(e)).toList();
+    if(!pages.isEqualsTo(explorePages)){
+      setState(() {
+        pages = explorePages;
+        controller = TabController(
+          length: pages.length,
+          vsync: this,
+        );
+      });
+    }
+  }
+
   @override
   void initState() {
     pages = List<String>.from(appdata.settings["explore_pages"]);
@@ -36,9 +55,17 @@ class _ExplorePageState extends State<ExplorePage>
       length: pages.length,
       vsync: this,
     );
+    appdata.settings.addListener(onSettingsChanged);
     super.initState();
   }
 
+  @override
+  void dispose() {
+    controller.dispose();
+    appdata.settings.removeListener(onSettingsChanged);
+    super.dispose();
+  }
+
   void refresh() {
     int page = controller.index;
     String currentPageId = pages[page];
@@ -83,12 +110,14 @@ class _ExplorePageState extends State<ExplorePage>
 
   @override
   Widget build(BuildContext context) {
+    super.build(context);
     if (pages.isEmpty) {
       return buildEmpty();
     }
 
     Widget tabBar = Material(
       child: FilledTabBar(
+        key: Key(pages.toString()),
         tabs: pages.map((e) => buildTab(e)).toList(),
         controller: controller,
       ),
@@ -118,7 +147,8 @@ class _ExplorePageState extends State<ExplorePage>
                       setState(() {
                         showFB = false;
                       });
-                  } else if ((current < location || current == 0) && !showFB) {
+                    } else if ((current < location || current == 0) &&
+                        !showFB) {
                       setState(() {
                         showFB = true;
                       });
@@ -138,7 +168,8 @@ class _ExplorePageState extends State<ExplorePage>
                 ),
               )
             ],
-        )),
+          ),
+        ),
         Positioned(
           right: 16,
           bottom: 16,
@@ -159,6 +190,9 @@ class _ExplorePageState extends State<ExplorePage>
       ],
     );
   }
+
+  @override
+  bool get wantKeepAlive => true;
 }
 
 class _SingleExplorePage extends StatefulWidget {
@@ -170,7 +204,8 @@ class _SingleExplorePage extends StatefulWidget {
   State<_SingleExplorePage> createState() => _SingleExplorePageState();
 }
 
-class _SingleExplorePageState extends StateWithController<_SingleExplorePage> {
+class _SingleExplorePageState extends StateWithController<_SingleExplorePage>
+    with AutomaticKeepAliveClientMixin<_SingleExplorePage> {
   late final ExplorePageData data;
 
   bool loading = true;
@@ -183,6 +218,16 @@ class _SingleExplorePageState extends StateWithController<_SingleExplorePage> {
 
   int key = 0;
 
+  bool _wantKeepAlive = true;
+
+  void onSettingsChanged() {
+    var explorePages = appdata.settings["explore_pages"];
+    if (!explorePages.contains(widget.title)) {
+      _wantKeepAlive = false;
+      updateKeepAlive();
+    }
+  }
+
   @override
   void initState() {
     super.initState();
@@ -195,11 +240,19 @@ class _SingleExplorePageState extends StateWithController<_SingleExplorePage> {
         }
       }
     }
+    appdata.settings.addListener(onSettingsChanged);
     throw "Explore Page ${widget.title} Not Found!";
   }
 
+  @override
+  void dispose() {
+    appdata.settings.removeListener(onSettingsChanged);
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
+    super.build(context);
     if (data.loadMultiPart != null) {
       return buildMultiPart();
     } else if (data.loadPage != null || data.loadNext != null) {
@@ -284,6 +337,9 @@ class _SingleExplorePageState extends StateWithController<_SingleExplorePage> {
       });
     }
   }
+
+  @override
+  bool get wantKeepAlive => _wantKeepAlive;
 }
 
 class _MixedExplorePage extends StatefulWidget {

lib/utils/ext.dart

@@ -24,6 +24,18 @@ extension ListExt<T> on List<T>{
       add(value);
     }
   }
+
+  bool isEqualsTo(List<T> list){
+    if(length != list.length){
+      return false;
+    }
+    for(int i=0; i<length; i++){
+      if(this[i] != list[i]){
+        return false;
+      }
+    }
+    return true;
+  }
 }
 
 extension StringExt on String{