opt: load previous data

Closes #597

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

lib/common/widgets/episode_panel.dart

@@ -6,7 +6,7 @@ import 'package:PiliPlus/common/widgets/icon_button.dart';
 import 'package:PiliPlus/common/widgets/image_save.dart';
 import 'package:PiliPlus/common/widgets/keep_alive_wrapper.dart';
 import 'package:PiliPlus/common/widgets/network_img_layer.dart';
-import 'package:PiliPlus/common/widgets/spring_physics.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 import 'package:PiliPlus/common/widgets/stat/stat.dart';
 import 'package:PiliPlus/http/loading_state.dart';
 import 'package:PiliPlus/http/video.dart';

lib/common/widgets/scroll_physics.dart

@@ -52,3 +52,35 @@ class CustomTabBarViewClampingScrollPhysics extends ClampingScrollPhysics {
         damping: GStorage.springDescription[2],
       );
 }
+
+class PositionRetainedScrollPhysics extends AlwaysScrollableScrollPhysics {
+  const PositionRetainedScrollPhysics({super.parent});
+
+  @override
+  PositionRetainedScrollPhysics applyTo(ScrollPhysics? ancestor) {
+    return PositionRetainedScrollPhysics(parent: buildParent(ancestor));
+  }
+
+  @override
+  double adjustPositionForNewDimensions({
+    required ScrollMetrics oldPosition,
+    required ScrollMetrics newPosition,
+    required bool isScrolling,
+    required double velocity,
+  }) {
+    final position = super.adjustPositionForNewDimensions(
+      oldPosition: oldPosition,
+      newPosition: newPosition,
+      isScrolling: isScrolling,
+      velocity: velocity,
+    );
+
+    final diff = newPosition.maxScrollExtent - oldPosition.maxScrollExtent;
+
+    if (oldPosition.pixels >= oldPosition.minScrollExtent && diff > 0) {
+      return position + diff;
+    } else {
+      return position;
+    }
+  }
+}

lib/pages/bangumi/view.dart

@@ -16,7 +16,7 @@ import 'package:PiliPlus/pages/main/index.dart';
 import '../../utils/grid.dart';
 import 'controller.dart';
 import 'widgets/bangumi_card_v.dart';
-import 'package:PiliPlus/common/widgets/spring_physics.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 
 class BangumiPage extends StatefulWidget {
   const BangumiPage({

lib/pages/danmaku_block/index.dart

@@ -7,7 +7,7 @@ import 'package:PiliPlus/utils/storage.dart';
 import '../../http/danmaku_block.dart';
 import '../../models/user/danmaku_block.dart';
 import '../../plugin/pl_player/controller.dart';
-import 'package:PiliPlus/common/widgets/spring_physics.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 
 class DanmakuBlockPage extends StatefulWidget {
   const DanmakuBlockPage({super.key});

lib/pages/dynamics/view.dart

@@ -11,7 +11,7 @@ import 'package:material_design_icons_flutter/material_design_icons_flutter.dart
 
 import 'controller.dart';
 import 'widgets/up_panel.dart';
-import 'package:PiliPlus/common/widgets/spring_physics.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 
 enum ReplyOption { allow, close, choose }
 

lib/pages/emote/view.dart

@@ -5,7 +5,7 @@ import 'package:flutter/material.dart';
 import 'package:get/get.dart';
 import '../../common/widgets/network_img_layer.dart';
 import 'controller.dart';
-import 'package:PiliPlus/common/widgets/spring_physics.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 
 class EmotePanel extends StatefulWidget {
   final Function onChoose;

lib/pages/follow/view.dart

@@ -5,7 +5,7 @@ import 'package:get/get.dart';
 import 'controller.dart';
 import 'widgets/follow_list.dart';
 import 'widgets/owner_follow_list.dart';
-import 'package:PiliPlus/common/widgets/spring_physics.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 
 class FollowPage extends StatefulWidget {
   const FollowPage({super.key});

lib/pages/home/view.dart

@@ -8,7 +8,7 @@ import 'package:PiliPlus/common/widgets/network_img_layer.dart';
 import 'package:PiliPlus/utils/feed_back.dart';
 import 'package:material_design_icons_flutter/material_design_icons_flutter.dart';
 import './controller.dart';
-import 'package:PiliPlus/common/widgets/spring_physics.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 import 'package:stream_transform/stream_transform.dart';
 
 class HomePage extends StatefulWidget {

lib/pages/login/view.dart

@@ -1,7 +1,7 @@
 import 'dart:ui';
 
 import 'package:PiliPlus/common/constants.dart';
-import 'package:PiliPlus/common/widgets/spring_physics.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 import 'package:PiliPlus/utils/utils.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';

lib/pages/member/new/content/member_contribute/content/video/member_video.dart

@@ -2,8 +2,10 @@ import 'package:PiliPlus/common/constants.dart';
 import 'package:PiliPlus/common/widgets/custom_sliver_persistent_header_delegate.dart';
 import 'package:PiliPlus/common/widgets/loading_widget.dart';
 import 'package:PiliPlus/common/widgets/refresh_indicator.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 import 'package:PiliPlus/common/widgets/video_card_h_member_video.dart';
 import 'package:PiliPlus/http/loading_state.dart';
+import 'package:PiliPlus/models/space_archive/item.dart';
 import 'package:PiliPlus/pages/member/new/content/member_contribute/content/video/member_video_ctr.dart';
 import 'package:PiliPlus/pages/member/new/content/member_contribute/member_contribute.dart'
     show ContributeType;
@@ -70,6 +72,7 @@ class _MemberVideoState extends State<MemberVideo>
                     await _controller.onRefresh();
                   },
                   child: CustomScrollView(
+                    physics: const PositionRetainedScrollPhysics(),
                     slivers: [
                       SliverPersistentHeader(
                         pinned: false,
@@ -183,8 +186,10 @@ class _MemberVideoState extends State<MemberVideo>
                                   index == loadingState.response.length - 1) {
                                 _controller.onLoadMore();
                               }
+                              final Item item = loadingState.response[index];
                               return VideoCardHMemberVideo(
-                                videoItem: loadingState.response[index],
+                                key: ValueKey('${item.param}'),
+                                videoItem: item,
                                 fromViewAid: _controller.fromViewAid,
                               );
                             },

lib/pages/member/new/member_page.dart

@@ -15,7 +15,7 @@ import 'package:PiliPlus/utils/utils.dart';
 import 'package:extended_nested_scroll_view/extended_nested_scroll_view.dart';
 import 'package:flutter/material.dart';
 import 'package:get/get.dart';
-import 'package:PiliPlus/common/widgets/spring_physics.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 
 class MemberPageNew extends StatefulWidget {
   const MemberPageNew({super.key});

lib/pages/member_search/view.dart

@@ -3,7 +3,7 @@ import 'package:PiliPlus/pages/member_search/search_dynamic.dart';
 import 'package:flutter/material.dart';
 import 'package:get/get.dart';
 import 'controller.dart';
-import 'package:PiliPlus/common/widgets/spring_physics.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 
 class MemberSearchPage extends StatefulWidget {
   const MemberSearchPage({super.key});

lib/pages/search_result/view.dart

@@ -5,7 +5,7 @@ import 'package:get/get.dart';
 import 'package:PiliPlus/models/common/search_type.dart';
 import 'package:PiliPlus/pages/search_panel/index.dart';
 import 'controller.dart';
-import 'package:PiliPlus/common/widgets/spring_physics.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 
 class SearchResultPage extends StatefulWidget {
   const SearchResultPage({super.key});

lib/pages/video/detail/member/horizontal_member_page.dart

@@ -5,6 +5,7 @@ import 'package:PiliPlus/common/widgets/interactiveviewer_gallery/interactivevie
     show SourceModel;
 import 'package:PiliPlus/common/widgets/loading_widget.dart';
 import 'package:PiliPlus/common/widgets/network_img_layer.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 import 'package:PiliPlus/common/widgets/video_card_h_member_video.dart';
 import 'package:PiliPlus/http/loading_state.dart';
 import 'package:PiliPlus/models/member/info.dart';
@@ -179,7 +180,7 @@ class _HorizontalMemberPageState extends State<HorizontalMemberPage> {
           color: Colors.transparent,
           child: CustomScrollView(
             controller: _controller.scrollController,
-            physics: const AlwaysScrollableScrollPhysics(),
+            physics: const PositionRetainedScrollPhysics(),
             slivers: [
               _buildSliverHeader,
               SliverPadding(
@@ -198,11 +199,12 @@ class _HorizontalMemberPageState extends State<HorizontalMemberPage> {
                           _controller.hasNext) {
                         _controller.onLoadMore();
                       }
+                      final Item videoItem = loadingState.response[index];
                       return VideoCardHMemberVideo(
-                        videoItem: loadingState.response[index],
+                        key: ValueKey('${videoItem.param}'),
+                        videoItem: videoItem,
                         bvid: _bvid,
                         onTap: () {
-                          final Item videoItem = loadingState.response[index];
                           final status =
                               widget.videoIntroController.changeSeasonOrbangu(
                             null,

lib/pages/video/detail/view_v.dart

@@ -51,7 +51,7 @@ import 'package:screen_brightness/screen_brightness.dart';
 
 import '../../../services/shutdown_timer_service.dart';
 import 'widgets/header_control.dart';
-import 'package:PiliPlus/common/widgets/spring_physics.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 
 class VideoDetailPageV extends StatefulWidget {
   const VideoDetailPageV({super.key});

lib/pages/video/detail/widgets/media_list_panel.dart

@@ -2,6 +2,7 @@ import 'package:PiliPlus/common/widgets/dialog.dart';
 import 'package:PiliPlus/common/widgets/icon_button.dart';
 import 'package:PiliPlus/common/widgets/image_save.dart';
 import 'package:PiliPlus/common/widgets/refresh_indicator.dart';
+import 'package:PiliPlus/common/widgets/scroll_physics.dart';
 import 'package:PiliPlus/common/widgets/stat/stat.dart';
 import 'package:PiliPlus/pages/common/common_collapse_slide_page.dart';
 import 'package:flutter/material.dart';
@@ -126,7 +127,7 @@ class _MediaListPanelState
               widget.onDelete != null && widget.mediaList.length > 1;
           return ScrollablePositionedList.separated(
             itemScrollController: _scrollController,
-            physics: const AlwaysScrollableScrollPhysics(),
+            physics: const PositionRetainedScrollPhysics(),
             itemCount: widget.mediaList.length,
             padding: EdgeInsets.only(
               top: 7,
@@ -140,6 +141,7 @@ class _MediaListPanelState
                 widget.loadMoreMedia();
               }
               return SizedBox(
+                key: ValueKey('${item.aid}'),
                 height: 98,
                 child: InkWell(
                   onTap: () async {