Jump to the last item shown after exiting slideshow

app/lib/widget/slideshow_viewer.dart

@@ -49,7 +49,8 @@ class SlideshowViewerArguments {
 class SlideshowViewer extends StatelessWidget {
   static const routeName = "/slideshow-viewer";
 
-  static Route buildRoute(SlideshowViewerArguments args) => MaterialPageRoute(
+  static Route buildRoute(SlideshowViewerArguments args) =>
+      MaterialPageRoute<int>(
         builder: (context) => SlideshowViewer.fromArgs(args),
       );
 
@@ -116,15 +117,35 @@ class _WrappedSlideshowViewerState extends State<_WrappedSlideshowViewer>
 
   @override
   Widget build(BuildContext context) {
-    return Theme(
+    return MultiBlocListener(
+      listeners: [
+        _BlocListenerT<bool>(
+          selector: (state) => state.hasRequestExit,
+          listener: (context, hasRequestExit) {
+            if (hasRequestExit) {
+              final pageIndex = context.state.page;
+              final fileIndex = context.bloc.convertPageToFileIndex(pageIndex);
+              Navigator.of(context).pop(fileIndex);
+            }
+          },
+        ),
+      ],
+      child: Theme(
         data: buildDarkTheme(context),
-      child: const AnnotatedRegion<SystemUiOverlayStyle>(
-        value: SystemUiOverlayStyle(
+        child: AnnotatedRegion<SystemUiOverlayStyle>(
+          value: const SystemUiOverlayStyle(
             systemNavigationBarColor: Colors.black,
             systemNavigationBarIconBrightness: Brightness.dark,
           ),
           child: Scaffold(
-          body: _Body(),
+            body: PopScope(
+              canPop: false,
+              onPopInvoked: (_) {
+                context.addEvent(const _RequestExit());
+              },
+              child: const _Body(),
+            ),
+          ),
         ),
       ),
     );

app/lib/widget/slideshow_viewer.g.dart

@@ -25,7 +25,8 @@ abstract class $_StateCopyWithWorker {
       bool? hasPrev,
       bool? hasNext,
       bool? isShowTimeline,
-      bool? hasShownTimeline});
+      bool? hasShownTimeline,
+      bool? hasRequestExit});
 }
 
 class _$_StateCopyWithWorkerImpl implements $_StateCopyWithWorker {
@@ -44,7 +45,8 @@ class _$_StateCopyWithWorkerImpl implements $_StateCopyWithWorker {
       dynamic hasPrev,
       dynamic hasNext,
       dynamic isShowTimeline,
-      dynamic hasShownTimeline}) {
+      dynamic hasShownTimeline,
+      dynamic hasRequestExit}) {
     return _State(
         hasInit: hasInit as bool? ?? that.hasInit,
         page: page as int? ?? that.page,
@@ -58,7 +60,8 @@ class _$_StateCopyWithWorkerImpl implements $_StateCopyWithWorker {
         hasPrev: hasPrev as bool? ?? that.hasPrev,
         hasNext: hasNext as bool? ?? that.hasNext,
         isShowTimeline: isShowTimeline as bool? ?? that.isShowTimeline,
-        hasShownTimeline: hasShownTimeline as bool? ?? that.hasShownTimeline);
+        hasShownTimeline: hasShownTimeline as bool? ?? that.hasShownTimeline,
+        hasRequestExit: hasRequestExit as bool? ?? that.hasRequestExit);
   }
 
   final _State that;
@@ -101,7 +104,7 @@ extension _$_PageViewNpLog on _PageView {
 extension _$_StateToString on _State {
   String _$toString() {
     // ignore: unnecessary_string_interpolations
-    return "_State {hasInit: $hasInit, page: $page, nextPage: $nextPage, shouldAnimateNextPage: $shouldAnimateNextPage, currentFile: ${currentFile.fdPath}, isShowUi: $isShowUi, isPlay: $isPlay, isVideoCompleted: $isVideoCompleted, hasPrev: $hasPrev, hasNext: $hasNext, isShowTimeline: $isShowTimeline, hasShownTimeline: $hasShownTimeline}";
+    return "_State {hasInit: $hasInit, page: $page, nextPage: $nextPage, shouldAnimateNextPage: $shouldAnimateNextPage, currentFile: ${currentFile.fdPath}, isShowUi: $isShowUi, isPlay: $isPlay, isVideoCompleted: $isVideoCompleted, hasPrev: $hasPrev, hasNext: $hasNext, isShowTimeline: $isShowTimeline, hasShownTimeline: $hasShownTimeline, hasRequestExit: $hasRequestExit}";
   }
 }
 
@@ -188,3 +191,10 @@ extension _$_RequestPageToString on _RequestPage {
     return "_RequestPage {value: $value}";
   }
 }
+
+extension _$_RequestExitToString on _RequestExit {
+  String _$toString() {
+    // ignore: unnecessary_string_interpolations
+    return "_RequestExit {}";
+  }
+}

app/lib/widget/slideshow_viewer/bloc.dart

@@ -22,6 +22,7 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
     on<_NextPage>(_onNextPage);
     on<_ToggleTimeline>(_onToggleTimeline);
     on<_RequestPage>(_onRequestPage);
+    on<_RequestExit>(_onRequestExit);
   }
 
   @override
@@ -179,6 +180,11 @@ class _Bloc extends Bloc<_Event, _State> with BlocLogger {
     ));
   }
 
+  void _onRequestExit(_RequestExit ev, Emitter<_State> emit) {
+    _log.info(ev);
+    emit(state.copyWith(hasRequestExit: true));
+  }
+
   static ({List<int> shuffled, int initial, int? count}) _parseConfig({
     required List<FileDescriptor> files,
     required int startIndex,

app/lib/widget/slideshow_viewer/state_event.dart

@@ -16,6 +16,7 @@ class _State {
     required this.hasNext,
     required this.isShowTimeline,
     required this.hasShownTimeline,
+    required this.hasRequestExit,
   });
 
   factory _State.init({
@@ -34,6 +35,7 @@ class _State {
         hasNext: false,
         isShowTimeline: false,
         hasShownTimeline: false,
+        hasRequestExit: false,
       );
 
   @override
@@ -51,6 +53,7 @@ class _State {
   final bool hasNext;
   final bool isShowTimeline;
   final bool hasShownTimeline;
+  final bool hasRequestExit;
 }
 
 abstract class _Event {}
@@ -158,3 +161,11 @@ class _RequestPage implements _Event {
 
   final int value;
 }
+
+@toString
+class _RequestExit implements _Event {
+  const _RequestExit();
+
+  @override
+  String toString() => _$toString();
+}

app/lib/widget/slideshow_viewer/view.dart

@@ -30,7 +30,7 @@ class _AppBar extends StatelessWidget {
               icon: const Icon(Icons.close),
               tooltip: MaterialLocalizations.of(context).closeButtonTooltip,
               onPressed: () {
-                Navigator.of(context).pop();
+                context.addEvent(const _RequestExit());
               },
             ),
           ),

app/lib/widget/viewer.dart

@@ -858,13 +858,15 @@ class _ViewerState extends State<Viewer>
     unawaited(Pref().setSlideshowShuffle(result.isShuffle));
     unawaited(Pref().setSlideshowRepeat(result.isRepeat));
     unawaited(Pref().setSlideshowReverse(result.isReverse));
-    unawaited(
-      Navigator.of(context).pushNamed(
+    final newIndex = await Navigator.of(context).pushNamed<int>(
       SlideshowViewer.routeName,
       arguments: SlideshowViewerArguments(widget.account, widget.streamFiles,
           _viewerController.currentPage, result),
-      ),
     );
+    _log.info("[_onSlideshowPressed] Slideshow ended, jump to: $newIndex");
+    if (newIndex != null && context.mounted) {
+      _viewerController.jumpToPage(newIndex);
+    }
   }
 
   double _calcDetailPaneOffset(int index) {