onNavigationNotification for *App.router (#142190)

onNavigationNotification was not being passed through when using the router in MaterialApp and CupertinoApp. I believe this was just an oversight on my part when I wrote https://github.com/flutter/flutter/pull/120385. This PR passes them through.

Fixes https://github.com/flutter/flutter/issues/139903

@maRci0002 Would this totally fix your issue https://github.com/flutter/flutter/issues/139903?

packages/flutter/lib/src/cupertino/app.dart

@@ -547,6 +547,7 @@ class _CupertinoAppState extends State<CupertinoApp> {
         routerDelegate: widget.routerDelegate,
         routerConfig: widget.routerConfig,
         backButtonDispatcher: widget.backButtonDispatcher,
+        onNavigationNotification: widget.onNavigationNotification,
         builder: widget.builder,
         title: widget.title,
         onGenerateTitle: widget.onGenerateTitle,

packages/flutter/lib/src/material/app.dart

@@ -1016,6 +1016,7 @@ class _MaterialAppState extends State<MaterialApp> {
         routerDelegate: widget.routerDelegate,
         routerConfig: widget.routerConfig,
         backButtonDispatcher: widget.backButtonDispatcher,
+        onNavigationNotification: widget.onNavigationNotification,
         builder: _materialBuilder,
         title: widget.title,
         onGenerateTitle: widget.onGenerateTitle,

packages/flutter/lib/src/widgets/app.dart

@@ -706,7 +706,12 @@ class WidgetsApp extends StatefulWidget {
   /// {@template flutter.widgets.widgetsApp.onNavigationNotification}
   /// The callback to use when receiving a [NavigationNotification].
   ///
-  /// By default this updates the engine with the navigation status.
+  /// By default this updates the engine with the navigation status and stops
+  /// bubbling the notification.
+  ///
+  /// See also:
+  ///
+  ///  * [NotificationListener.onNotification], which uses this callback.
   /// {@endtemplate}
   final NotificationListenerCallback<NavigationNotification>? onNavigationNotification;
 

packages/flutter/test/cupertino/app_test.dart

@@ -179,6 +179,52 @@ void main() {
     expect(find.text('popped'), findsOneWidget);
   });
 
+  testWidgets('CupertinoApp.router works with onNavigationNotification', (WidgetTester tester) async {
+    // This is a regression test for https://github.com/flutter/flutter/issues/139903.
+    final PlatformRouteInformationProvider provider = PlatformRouteInformationProvider(
+      initialRouteInformation: RouteInformation(
+        uri: Uri.parse('initial'),
+      ),
+    );
+    addTearDown(provider.dispose);
+    final SimpleNavigatorRouterDelegate delegate = SimpleNavigatorRouterDelegate(
+      builder: (BuildContext context, RouteInformation information) {
+        return Text(information.uri.toString());
+      },
+      onPopPage: (Route<void> route, void result, SimpleNavigatorRouterDelegate delegate) {
+        delegate.routeInformation = RouteInformation(
+          uri: Uri.parse('popped'),
+        );
+        return route.didPop(result);
+      },
+    );
+    addTearDown(delegate.dispose);
+
+    int navigationCount = 0;
+
+    await tester.pumpWidget(CupertinoApp.router(
+      routeInformationProvider: provider,
+      routeInformationParser: SimpleRouteInformationParser(),
+      routerDelegate: delegate,
+      onNavigationNotification: (NavigationNotification? notification) {
+        navigationCount += 1;
+        return true;
+      },
+    ));
+    expect(find.text('initial'), findsOneWidget);
+
+    expect(navigationCount, greaterThan(0));
+    final int navigationCountAfterBuild = navigationCount;
+
+    // Simulate android back button intent.
+    final ByteData message = const JSONMethodCodec().encodeMethodCall(const MethodCall('popRoute'));
+    await tester.binding.defaultBinaryMessenger.handlePlatformMessage('flutter/navigation', message, (_) { });
+    await tester.pumpAndSettle();
+    expect(find.text('popped'), findsOneWidget);
+
+    expect(navigationCount, greaterThan(navigationCountAfterBuild));
+  });
+
   testWidgets('CupertinoApp.router route information parser is optional', (WidgetTester tester) async {
     final SimpleNavigatorRouterDelegate delegate = SimpleNavigatorRouterDelegate(
       builder: (BuildContext context, RouteInformation information) {

packages/flutter/test/material/app_test.dart

@@ -1118,6 +1118,52 @@ void main() {
     expect(find.text('popped'), findsOneWidget);
   });
 
+  testWidgets('MaterialApp.router works with onNavigationNotification', (WidgetTester tester) async {
+    // This is a regression test for https://github.com/flutter/flutter/issues/139903.
+    final PlatformRouteInformationProvider provider = PlatformRouteInformationProvider(
+      initialRouteInformation: RouteInformation(
+        uri: Uri.parse('initial'),
+      ),
+    );
+    addTearDown(provider.dispose);
+    final SimpleNavigatorRouterDelegate delegate = SimpleNavigatorRouterDelegate(
+      builder: (BuildContext context, RouteInformation information) {
+        return Text(information.uri.toString());
+      },
+      onPopPage: (Route<void> route, void result, SimpleNavigatorRouterDelegate delegate) {
+        delegate.routeInformation = RouteInformation(
+          uri: Uri.parse('popped'),
+        );
+        return route.didPop(result);
+      },
+    );
+    addTearDown(delegate.dispose);
+
+    int navigationCount = 0;
+
+    await tester.pumpWidget(MaterialApp.router(
+      routeInformationProvider: provider,
+      routeInformationParser: SimpleRouteInformationParser(),
+      routerDelegate: delegate,
+      onNavigationNotification: (NavigationNotification? notification) {
+        navigationCount += 1;
+        return true;
+      },
+    ));
+    expect(find.text('initial'), findsOneWidget);
+
+    expect(navigationCount, greaterThan(0));
+    final int navigationCountAfterBuild = navigationCount;
+
+    // Simulate android back button intent.
+    final ByteData message = const JSONMethodCodec().encodeMethodCall(const MethodCall('popRoute'));
+    await tester.binding.defaultBinaryMessenger.handlePlatformMessage('flutter/navigation', message, (_) { });
+    await tester.pumpAndSettle();
+    expect(find.text('popped'), findsOneWidget);
+
+    expect(navigationCount, greaterThan(navigationCountAfterBuild));
+  });
+
   testWidgets('MaterialApp.router route information parser is optional', (WidgetTester tester) async {
     final SimpleNavigatorRouterDelegate delegate = SimpleNavigatorRouterDelegate(
       builder: (BuildContext context, RouteInformation information) {