opt dyn topic

opt member opus

Signed-off-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/pages/dynamics_topic/controller.dart

@@ -20,6 +20,8 @@ class DynTopicController
   String offset = '';
   Rx<TopicSortByConf?> topicSortByConf = Rx<TopicSortByConf?>(null);
 
+  double? appbarOffset;
+
   // top
   final isLogin = Accounts.main.isLogin;
   Rx<bool?> isFav = Rx<bool?>(null);
@@ -63,7 +65,14 @@ class DynTopicController
 
   @override
   Future<void> onReload() {
-    scrollController.jumpToTop();
+    if (appbarOffset != null) {
+      if (scrollController.hasClients &&
+          scrollController.offset > appbarOffset!) {
+        scrollController.jumpTo(appbarOffset!);
+      }
+    } else {
+      scrollController.jumpToTop();
+    }
     return super.onReload();
   }
 

lib/pages/dynamics_topic/view.dart

@@ -123,11 +123,14 @@ class _DynTopicPageState extends State<DynTopicPage> {
   }
 
   Widget _buildAppBar(ThemeData theme, LoadingState<TopDetails?> topState) {
+    late final paddingTop = MediaQuery.paddingOf(context).top;
     return switch (topState) {
       Loading() => const SliverAppBar(),
       Success(:var response) when (topState.dataOrNull != null) =>
         DynamicSliverAppBarMedium(
           pinned: true,
+          callback: (value) => _controller.appbarOffset =
+              value - kToolbarHeight - paddingTop - 7,
           title: IgnorePointer(child: Text(response!.topicItem!.name!)),
           flexibleSpace: Container(
             decoration: BoxDecoration(
@@ -140,7 +143,7 @@ class _DynTopicPageState extends State<DynTopicPage> {
               ),
             ),
             padding: EdgeInsets.only(
-              top: MediaQuery.paddingOf(context).top,
+              top: paddingTop,
               left: 12,
               right: 12,
             ),