add RouterListener, a widget that can inform its descendants about route changes…

…. Useful for nested navigation, to prevent unnecessary Rebuilds involving RouterOutlet.builder on all widgets.

@@ -10,31 +10,21 @@ class RootView extends GetView<RootController> {
 
   @override
   Widget build(BuildContext context) {
-    return RouterOutlet.builder(
-      delegate: Get.nestedKey(null),
-      builder: (context) {
-        final title = context.location;
-        return Scaffold(
-          drawer: const DrawerWidget(),
-          appBar: AppBar(
-            title: Text(title),
-            centerTitle: true,
-          ),
-          //body: HomeView(),
+    return Scaffold(
+      drawer: const DrawerWidget(),
+      appBar: AppBar(
+        title: RouterListener(builder: (context) {
+          final title = context.location;
+          return Text(title);
+        }),
+        centerTitle: true,
+      ),
+      //body: HomeView(),
 
-          body: GetRouterOutlet(
-            initialRoute: Routes.home,
-            delegate: Get.nestedKey(null),
-            anchorRoute: '/',
-            filterPages: (afterAnchor) {
-              // print(afterAnchor);
-              // print('dddddddddddddddddd');
-              // print(afterAnchor.take(1));
-              return afterAnchor.take(1);
-            },
-          ),
-        );
-      },
+      body: GetRouterOutlet(
+        initialRoute: Routes.home,
+        anchorRoute: '/',
+      ),
     );
   }
 }

@@ -160,34 +160,19 @@ class GetRouterOutlet extends RouterOutlet<GetDelegate, RouteDecoder> {
 }
 
 extension PagesListExt on List<GetPage> {
-  Iterable<GetPage> pickAtRoute(String route) {
-    return skipWhile((value) {
-      return value.name != route;
-    });
+  /// Returns the route and all following routes after the given route.
+  Iterable<GetPage> pickFromRoute(String route) {
+    return skipWhile((value) => value.name != route);
   }
 
+  /// Returns the routes after the given route.
   Iterable<GetPage> pickAfterRoute(String route) {
-    return pickAtRoute(route).skip(1);
-  }
-}
-
-class GetRouterOutletInherited extends InheritedWidget {
-  final String anchorRoute;
-
-  const GetRouterOutletInherited({
-    super.key,
-    required this.anchorRoute,
-    required Widget child,
-  }) : super(child: child);
-
-  static GetRouterOutletInherited? of(BuildContext context) {
-    return context
-        .dependOnInheritedWidgetOfExactType<GetRouterOutletInherited>();
-  }
-
-  @override
-  bool updateShouldNotify(covariant InheritedWidget oldWidget) {
-    return true;
+    // If the provided route is root, we take the first route after root.
+    if (route == '/') {
+      return pickFromRoute(route).skip(1).take(1);
+    }
+    // Otherwise, we skip the route and take all routes after it.
+    return pickFromRoute(route).skip(1);
   }
 }
 
@@ -221,3 +206,92 @@ class IndexedRouteBuilder<T> extends StatelessWidget {
     return builder(context, routes, index);
   }
 }
+
+mixin RouterListenerMixin<T extends StatefulWidget> on State<T> {
+  RouterDelegate? delegate;
+
+  void _listener() {
+    setState(() {});
+  }
+
+  VoidCallback? disposer;
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    disposer?.call();
+    final router = Router.of(context);
+    delegate ??= router.routerDelegate;
+    delegate?.addListener(_listener);
+    disposer = () => delegate?.removeListener(_listener);
+  }
+
+  @override
+  void dispose() {
+    super.dispose();
+    disposer?.call();
+  }
+}
+
+class RouterListenerInherited extends InheritedWidget {
+  const RouterListenerInherited({
+    super.key,
+    required Widget child,
+  }) : super(child: child);
+
+  static RouterListenerInherited? of(BuildContext context) {
+    return context
+        .dependOnInheritedWidgetOfExactType<RouterListenerInherited>();
+  }
+
+  @override
+  bool updateShouldNotify(covariant InheritedWidget oldWidget) {
+    return true;
+  }
+}
+
+class RouterListener extends StatefulWidget {
+  const RouterListener({
+    Key? key,
+    required this.builder,
+  }) : super(key: key);
+  final WidgetBuilder builder;
+
+  @override
+  State<RouterListener> createState() => RouteListenerState();
+}
+
+class RouteListenerState extends State<RouterListener>
+    with RouterListenerMixin {
+  @override
+  Widget build(BuildContext context) {
+    return RouterListenerInherited(child: Builder(builder: widget.builder));
+  }
+}
+
+class BackButtonCallback extends StatefulWidget {
+  const BackButtonCallback({Key? key, required this.builder}) : super(key: key);
+  final WidgetBuilder builder;
+
+  @override
+  State<BackButtonCallback> createState() => RouterListenerState();
+}
+
+class RouterListenerState extends State<BackButtonCallback>
+    with RouterListenerMixin {
+  late ChildBackButtonDispatcher backButtonDispatcher;
+
+  @override
+  void didChangeDependencies() {
+    super.didChangeDependencies();
+    final router = Router.of(context);
+    backButtonDispatcher =
+        router.backButtonDispatcher!.createChildBackButtonDispatcher();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    backButtonDispatcher.takePriority();
+    return widget.builder(context);
+  }
+}