fix #52

lib/components/comic.dart

@@ -829,6 +829,7 @@ class ComicList extends StatefulWidget {
     this.trailingSliver,
     this.errorLeading,
     this.menuBuilder,
+    this.controller,
   });
 
   final Future<Res<List<Comic>>> Function(int page)? loadPage;
@@ -843,6 +844,8 @@ class ComicList extends StatefulWidget {
 
   final List<MenuEntry> Function(Comic)? menuBuilder;
 
+  final ScrollController? controller;
+
   @override
   State<ComicList> createState() => ComicListState();
 }
@@ -1064,6 +1067,7 @@ class ComicListState extends State<ComicList> {
       );
     }
     return SmoothCustomScrollView(
+      controller: widget.controller,
       slivers: [
         if (widget.leadingSliver != null) widget.leadingSliver!,
         if (_maxPage != 1) _buildSliverPageSelector(),

lib/components/navigation_bar.dart

@@ -47,10 +47,16 @@ class NaviPane extends StatefulWidget {
   final GlobalKey<NavigatorState> navigatorKey;
 
   @override
-  State<NaviPane> createState() => _NaviPaneState();
+  State<NaviPane> createState() => NaviPaneState();
+
+  static NaviPaneState of(BuildContext context) {
+    return context.findAncestorStateOfType<NaviPaneState>()!;
+  }
 }
 
-class _NaviPaneState extends State<NaviPane>
+typedef NaviItemTapListener = void Function(int);
+
+class NaviPaneState extends State<NaviPane>
     with SingleTickerProviderStateMixin {
   late int _currentPage = widget.initialPage;
 
@@ -66,6 +72,16 @@ class _NaviPaneState extends State<NaviPane>
 
   late AnimationController controller;
 
+  final _naviItemTapListeners = <NaviItemTapListener>[];
+
+  void addNaviItemTapListener(NaviItemTapListener listener) {
+    _naviItemTapListeners.add(listener);
+  }
+
+  void removeNaviItemTapListener(NaviItemTapListener listener) {
+    _naviItemTapListeners.remove(listener);
+  }
+
   static const _kBottomBarHeight = 58.0;
 
   static const _kFoldedSideBarWidth = 80.0;
@@ -85,9 +101,15 @@ class _NaviPaneState extends State<NaviPane>
   }
 
   void updatePage(int index) {
+    for (var listener in _naviItemTapListeners) {
+      listener(index);
+    }
     if (widget.observer.routes.length > 1) {
       widget.navigatorKey.currentState!.popUntil((route) => route.isFirst);
     }
+    if (currentPage == index) {
+      return;
+    }
     setState(() {
       currentPage = index;
     });
@@ -670,14 +692,14 @@ class _NaviPopScope extends StatelessWidget {
 class _NaviMainView extends StatefulWidget {
   const _NaviMainView({required this.state});
 
-  final _NaviPaneState state;
+  final NaviPaneState state;
 
   @override
   State<_NaviMainView> createState() => _NaviMainViewState();
 }
 
 class _NaviMainViewState extends State<_NaviMainView> {
-  _NaviPaneState get state => widget.state;
+  NaviPaneState get state => widget.state;
 
   @override
   void initState() {

lib/foundation/state_controller.dart

@@ -1,14 +1,18 @@
 import 'package:flutter/material.dart';
 
 class SimpleController extends StateController {
-  final void Function()? refresh_;
+  final void Function()? refreshFunction;
 
-  SimpleController({this.refresh_});
+  final Map<String, dynamic> Function()? control;
+
+  SimpleController({this.refreshFunction, this.control});
 
   @override
   void refresh() {
-    (refresh_ ?? super.refresh)();
+    (refreshFunction ?? super.refresh)();
   }
+
+  Map<String, dynamic> get controlMap => control?.call() ?? {};
 }
 
 abstract class StateController {
@@ -71,8 +75,8 @@ abstract class StateController {
 
   static SimpleController putSimpleController(
       void Function() onUpdate, Object? tag,
-      {void Function()? refresh}) {
+      {void Function()? refresh, Map<String, dynamic> Function()? control}) {
-    var controller = SimpleController(refresh_: refresh);
+    var controller = SimpleController(refreshFunction: refresh, control: control);
     controller.stateUpdaters.add(Pair(null, onUpdate));
     _controllers.add(StateControllerWrapped(controller, false, tag));
     return controller;
@@ -202,6 +206,7 @@ abstract class StateWithController<T extends StatefulWidget> extends State<T> {
       },
       tag,
       refresh: refresh,
+      control: () => control,
     );
     super.initState();
   }
@@ -218,6 +223,8 @@ abstract class StateWithController<T extends StatefulWidget> extends State<T> {
   }
 
   Object? get tag;
+
+  Map<String, dynamic> get control => {};
 }
 
 class Pair<M, V>{

lib/pages/explore_page.dart

@@ -46,6 +46,18 @@ class _ExplorePageState extends State<ExplorePage>
     }
   }
 
+  void onNaviItemTapped(int index) {
+    if (index == 2) {
+      int page = controller.index;
+      String currentPageId = pages[page];
+      StateController.find<SimpleController>(tag: currentPageId)
+          .control!()['toTop']
+          ?.call();
+    }
+  }
+
+  NaviPaneState? naviPane;
+
   @override
   void initState() {
     pages = List<String>.from(appdata.settings["explore_pages"]);
@@ -59,13 +71,21 @@ class _ExplorePageState extends State<ExplorePage>
       vsync: this,
     );
     appdata.settings.addListener(onSettingsChanged);
+    NaviPane.of(context).addNaviItemTapListener(onNaviItemTapped);
     super.initState();
   }
 
+  @override
+  void didChangeDependencies() {
+    naviPane = NaviPane.of(context);
+    super.didChangeDependencies();
+  }
+
   @override
   void dispose() {
     controller.dispose();
     appdata.settings.removeListener(onSettingsChanged);
+    naviPane?.removeNaviItemTapListener(onNaviItemTapped);
     super.dispose();
   }
 
@@ -232,6 +252,8 @@ class _SingleExplorePageState extends StateWithController<_SingleExplorePage>
 
   bool _wantKeepAlive = true;
 
+  var scrollController = ScrollController();
+
   void onSettingsChanged() {
     var explorePages = appdata.settings["explore_pages"];
     if (!explorePages.contains(widget.title)) {
@@ -274,6 +296,7 @@ class _SingleExplorePageState extends StateWithController<_SingleExplorePage>
         data,
         comicSourceKey,
         key: ValueKey(key),
+        controller: scrollController,
       );
     } else {
       return const Center(
@@ -287,6 +310,7 @@ class _SingleExplorePageState extends StateWithController<_SingleExplorePage>
       loadPage: data.loadPage,
       loadNext: data.loadNext,
       key: ValueKey(key),
+      controller: scrollController,
     );
   }
 
@@ -323,6 +347,7 @@ class _SingleExplorePageState extends StateWithController<_SingleExplorePage>
 
   Widget buildPage() {
     return SmoothCustomScrollView(
+      controller: scrollController,
       slivers: _buildPage().toList(),
     );
   }
@@ -352,15 +377,30 @@ class _SingleExplorePageState extends StateWithController<_SingleExplorePage>
 
   @override
   bool get wantKeepAlive => _wantKeepAlive;
+
+  void toTop() {
+    if (scrollController.hasClients) {
+      scrollController.animateTo(
+        scrollController.position.minScrollExtent,
+        duration: const Duration(milliseconds: 200),
+        curve: Curves.easeInOut,
+      );
+    }
+  }
+
+  @override
+  Map<String, dynamic> get control => {"toTop": toTop};
 }
 
 class _MixedExplorePage extends StatefulWidget {
-  const _MixedExplorePage(this.data, this.sourceKey, {super.key});
+  const _MixedExplorePage(this.data, this.sourceKey, {super.key, this.controller});
 
   final ExplorePageData data;
 
   final String sourceKey;
 
+  final ScrollController? controller;
+
   @override
   State<_MixedExplorePage> createState() => _MixedExplorePageState();
 }
@@ -394,6 +434,7 @@ class _MixedExplorePageState
   @override
   Widget buildContent(BuildContext context, List<Object> data) {
     return SmoothCustomScrollView(
+      controller: widget.controller,
       slivers: [
         ...buildSlivers(context, data),
         if (haveNextPage) const ListLoadingIndicator().toSliver()