#437 tv: rail nav fix

lib/widgets/about/about_page.dart

@@ -8,6 +8,7 @@ import 'package:aves/widgets/common/basic/insets.dart';
 import 'package:aves/widgets/common/extensions/build_context.dart';
 import 'package:aves/widgets/navigation/tv_rail.dart';
 import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
 
 class AboutPage extends StatelessWidget {
   static const routeName = '/about';
@@ -47,7 +48,9 @@ class AboutPage extends StatelessWidget {
       return Scaffold(
         body: Row(
           children: [
-            const TvRail(),
+            TvRail(
+              controller: context.read<TvRailController>(),
+            ),
             Expanded(child: body),
           ],
         ),

lib/widgets/aves_app.dart

@@ -35,6 +35,7 @@ import 'package:aves/widgets/common/providers/highlight_info_provider.dart';
 import 'package:aves/widgets/common/providers/media_query_data_provider.dart';
 import 'package:aves/widgets/home_page.dart';
 import 'package:aves/widgets/navigation/tv_page_transitions.dart';
+import 'package:aves/widgets/navigation/tv_rail.dart';
 import 'package:aves/widgets/welcome_page.dart';
 import 'package:dynamic_color/dynamic_color.dart';
 import 'package:equatable/equatable.dart';
@@ -126,6 +127,7 @@ class _AvesAppState extends State<AvesApp> with WidgetsBindingObserver {
   late final Future<void> _appSetup;
   late final Future<bool> _shouldUseBoldFontLoader;
   late final Future<CorePalette?> _dynamicColorPaletteLoader;
+  final TvRailController _tvRailController = TvRailController();
   final CollectionSource _mediaStoreSource = MediaStoreSource();
   final Debouncer _mediaStoreChangeDebouncer = Debouncer(delay: Durations.mediaContentChangeDebounceDelay);
   final Set<String> _changedUris = {};
@@ -173,6 +175,8 @@ class _AvesAppState extends State<AvesApp> with WidgetsBindingObserver {
           value: appModeNotifier,
           child: Provider<CollectionSource>.value(
             value: _mediaStoreSource,
+            child: Provider<TvRailController>.value(
+              value: _tvRailController,
               child: DurationsProvider(
                 child: HighlightInfoProvider(
                   child: OverlaySupport(
@@ -283,6 +287,7 @@ class _AvesAppState extends State<AvesApp> with WidgetsBindingObserver {
             ),
           ),
         ),
+      ),
     );
   }
 

lib/widgets/collection/collection_page.dart

@@ -121,7 +121,10 @@ class _CollectionPageState extends State<CollectionPage> {
             return Scaffold(
               body: Row(
                 children: [
-                  TvRail(currentCollection: _collection),
+                  TvRail(
+                    controller: context.read<TvRailController>(),
+                    currentCollection: _collection,
+                  ),
                   Expanded(child: body),
                 ],
               ),

lib/widgets/filter_grids/common/filter_grid_page.dart

@@ -128,7 +128,9 @@ class FilterGridPage<T extends CollectionFilter> extends StatelessWidget {
       return Scaffold(
         body: Row(
           children: [
-            const TvRail(),
+            TvRail(
+              controller: context.read<TvRailController>(),
+            ),
             Expanded(child: body),
           ],
         ),

lib/widgets/navigation/tv_rail.dart

@@ -20,12 +20,19 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 
+class TvRailController {
+  int? focusedIndex;
+  double offset = 0;
+}
+
 class TvRail extends StatefulWidget {
   // collection loaded in the `CollectionPage`, if any
   final CollectionLens? currentCollection;
+  final TvRailController controller;
 
   const TvRail({
     super.key,
+    required this.controller,
     this.currentCollection,
   });
 
@@ -34,10 +41,41 @@ class TvRail extends StatefulWidget {
 }
 
 class _TvRailState extends State<TvRail> {
-  final _scrollController = ScrollController();
+  late final ScrollController _scrollController;
+  final FocusNode _focusNode = FocusNode();
+
+  TvRailController get controller => widget.controller;
 
   CollectionLens? get currentCollection => widget.currentCollection;
 
+  @override
+  void initState() {
+    super.initState();
+
+    _scrollController = ScrollController(initialScrollOffset: controller.offset);
+    _scrollController.addListener(_onScrollChanged);
+
+    final focusedIndex = controller.focusedIndex;
+    if (focusedIndex != null) {
+      controller.focusedIndex = null;
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        final nodes = _focusNode.children.toList();
+        debugPrint('TLAD focusedIndex=$focusedIndex < nodes.length=${nodes.length}');
+        if (focusedIndex < nodes.length) {
+          nodes[focusedIndex].requestFocus();
+        }
+      });
+    }
+  }
+
+  @override
+  void dispose() {
+    _scrollController.removeListener(_onScrollChanged);
+    _scrollController.dispose();
+    _focusNode.dispose();
+    super.dispose();
+  }
+
   @override
   Widget build(BuildContext context) {
     final header = Row(
@@ -64,11 +102,14 @@ class _TvRailState extends State<TvRail> {
       ...[
         SettingsPage.routeName,
         AboutPage.routeName,
+        if (!kReleaseMode) AppDebugPage.routeName,
       ].map(_routeNavEntry),
-      if (!kReleaseMode) _routeNavEntry(AppDebugPage.routeName),
     ];
 
-    final rail = NavigationRail(
+    final rail = Focus(
+      focusNode: _focusNode,
+      skipTraversal: true,
+      child: NavigationRail(
         backgroundColor: Theme.of(context).scaffoldBackgroundColor,
         extended: true,
         destinations: navEntries
@@ -78,7 +119,11 @@ class _TvRailState extends State<TvRail> {
                 ))
             .toList(),
         selectedIndex: max(0, navEntries.indexWhere(((v) => v.isSelected))),
-      onDestinationSelected: (index) => navEntries[index].onSelection(),
+        onDestinationSelected: (index) {
+          controller.focusedIndex = index;
+          navEntries[index].onSelection();
+        },
+      ),
     );
 
     return Column(
@@ -177,6 +222,8 @@ class _TvRailState extends State<TvRail> {
       (route) => false,
     );
   }
+
+  void _onScrollChanged() => controller.offset = _scrollController.offset;
 }
 
 @immutable

lib/widgets/settings/privacy/file_picker/crumb_line.dart

@@ -18,7 +18,7 @@ class CrumbLine extends StatefulWidget {
 }
 
 class _CrumbLineState extends State<CrumbLine> {
-  final ScrollController _controller = ScrollController();
+  final ScrollController _scrollController = ScrollController();
 
   VolumeRelativeDirectory get directory => widget.directory;
 
@@ -28,8 +28,8 @@ class _CrumbLineState extends State<CrumbLine> {
     if (oldWidget.directory.relativeDir.length < widget.directory.relativeDir.length) {
       // scroll to show last crumb
       WidgetsBinding.instance.addPostFrameCallback((_) {
-        final extent = _controller.position.maxScrollExtent;
-        _controller.animateTo(
+        final extent = _scrollController.position.maxScrollExtent;
+        _scrollController.animateTo(
           extent,
           duration: const Duration(milliseconds: 500),
           curve: Curves.easeOutQuad,
@@ -53,7 +53,7 @@ class _CrumbLineState extends State<CrumbLine> {
       ),
       child: ListView.builder(
         scrollDirection: Axis.horizontal,
-        controller: _controller,
+        controller: _scrollController,
         padding: const EdgeInsets.symmetric(horizontal: 8),
         itemBuilder: (context, index) {
           Widget _buildText(String text) => Padding(

lib/widgets/settings/settings_page.dart

@@ -75,7 +75,9 @@ class _SettingsPageState extends State<SettingsPage> with FeedbackMixin {
       return Scaffold(
         body: Row(
           children: [
-            const TvRail(),
+            TvRail(
+              controller: context.read<TvRailController>(),
+            ),
             Expanded(
               child: Column(
                 children: [