#437 tv: info page focus

lib/widgets/viewer/entry_viewer_stack.dart

@@ -248,8 +248,7 @@ class _EntryViewerStackState extends State<EntryViewerStack> with EntryViewContr
                 _overlayVisible.value = true;
               }
             } else if (notification is ShowInfoPageNotification) {
-              // remove focus, if any, to prevent viewer shortcuts activation from the Info page
-              _showInfoPage();
+              _goToVerticalPage(infoPage);
             } else if (notification is JumpToPreviousEntryNotification) {
               _jumpToHorizontalPageByDelta(-1);
             } else if (notification is JumpToNextEntryNotification) {
@@ -516,12 +515,6 @@ class _EntryViewerStackState extends State<EntryViewerStack> with EntryViewContr
     );
   }
 
-  void _showInfoPage() {
-    // remove focus, if any, to prevent viewer shortcuts activation from the Info page
-    FocusManager.instance.primaryFocus?.unfocus();
-    _goToVerticalPage(infoPage);
-  }
-
   Future<void> _goToVerticalPage(int page) async {
     final animationDuration = context.read<DurationsData>().viewerVerticalPageScrollAnimation;
     if (animationDuration > Duration.zero) {

lib/widgets/viewer/info/info_page.dart

@@ -38,11 +38,50 @@ class InfoPage extends StatefulWidget {
 }
 
 class _InfoPageState extends State<InfoPage> {
+  final FocusNode _focusNode = FocusNode();
   final ScrollController _scrollController = ScrollController();
   bool _scrollStartFromTop = false;
 
   static const splitScreenWidthThreshold = 600;
 
+  @override
+  void initState() {
+    super.initState();
+    _registerWidget(widget);
+    _onScrollingChanged();
+  }
+
+  @override
+  void didUpdateWidget(covariant InfoPage oldWidget) {
+    super.didUpdateWidget(oldWidget);
+    _unregisterWidget(oldWidget);
+    _registerWidget(widget);
+  }
+
+  @override
+  void dispose() {
+    _unregisterWidget(widget);
+    _focusNode.dispose();
+    _scrollController.dispose();
+    super.dispose();
+  }
+
+  void _registerWidget(InfoPage widget) {
+    widget.isScrollingNotifier.addListener(_onScrollingChanged);
+  }
+
+  void _unregisterWidget(InfoPage widget) {
+    widget.isScrollingNotifier.removeListener(_onScrollingChanged);
+  }
+
+  void _onScrollingChanged() {
+    if (!widget.isScrollingNotifier.value) {
+      // using `autofocus` while scrolling seems to fail for widget built offscreen
+      // so we give focus to this page when the screen is no longer scrolling
+      _focusNode.requestFocus();
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
@@ -63,6 +102,8 @@ class _InfoPageState extends State<InfoPage> {
                       final targetEntry = pageEntry ?? mainEntry;
                       return EmbeddedDataOpener(
                         entry: targetEntry,
+                        child: Focus(
+                          focusNode: _focusNode,
                           child: _InfoPageContent(
                             collection: widget.collection,
                             entry: targetEntry,
@@ -71,6 +112,7 @@ class _InfoPageState extends State<InfoPage> {
                             split: mqWidth > splitScreenWidthThreshold,
                             goToViewer: _goToViewer,
                           ),
+                        ),
                       );
                     }
 
@@ -173,6 +215,8 @@ class _InfoPageContentState extends State<_InfoPageContent> {
 
   @override
   void dispose() {
+    _metadataNotifier.dispose();
+    _isEditingMetadataNotifier.dispose();
     _unregisterWidget(widget);
     super.dispose();
   }