fix router example

app_widget/lib/src/snack.dart

@@ -3,9 +3,11 @@ import 'package:flutter/material.dart';
 Future<void> muiSnack(BuildContext context, String message) async {
   // ignore: avoid_print
   print('snack: $message');
-  ScaffoldMessenger.of(context)
-    ..hideCurrentSnackBar()
-    ..showSnackBar(SnackBar(
-      content: Text(message),
-    ));
+  if (context.mounted) {
+    ScaffoldMessenger.of(context)
+      ..hideCurrentSnackBar()
+      ..showSnackBar(SnackBar(
+        content: Text(message),
+      ));
+  }
 }

example/navigator_test_app_lib/lib/main.dart

@@ -1,7 +1,99 @@
+import 'package:flutter/material.dart';
+import 'package:tekartik_app_flutter_widget/mini_ui.dart';
+import 'package:tekartik_app_navigator_flutter/content_navigator.dart';
 import 'package:tekartik_test_menu_flutter/test.dart';
 
 void defineNavigatorMenu() {
   menu('navigator', () {
-    item('list assets', () async {});
+    item('run app with navigator', () async {
+      contentNavigatorDebug = true;
+      runAppWithNavigator();
+    });
   });
 }
+
+Future<void> _pushPage1(BuildContext context) async {
+  var result = await ContentNavigator.of(muiBuildContext)
+      .pushPath<Object?>(Page1ContentPath());
+  // ignore: use_build_context_synchronously
+  await muiSnack(muiBuildContext, 'push Page 1 result: $result');
+}
+
+var pageStartDef = ContentPageDef(
+    path: rootContentPath,
+    screenBuilder: (_) {
+      return muiScreenWidget('Start', () {
+        muiItem('push Page 1', () async {
+          await _pushPage1(muiBuildContext);
+        });
+      });
+    });
+var page1Def = ContentPageDef(
+    path: Page1ContentPath(),
+    screenBuilder: (_) {
+      return muiScreenWidget('Page 1', () {
+        muiItem('push Page 2', () async {
+          var result = await ContentNavigator.of(muiBuildContext)
+              .pushPath<Object?>(Page2ContentPath());
+          // ignore: use_build_context_synchronously
+          await muiSnack(muiBuildContext, 'push Page 2 result: $result');
+        });
+        muiItem('pop', () {
+          Navigator.of(muiBuildContext).pop();
+        });
+      });
+    });
+var page2Def = ContentPageDef(
+    path: Page2ContentPath(),
+    screenBuilder: (_) {
+      return muiScreenWidget('Page 2', () {
+        muiItem('pop', () {
+          Navigator.of(muiBuildContext).pop();
+        });
+        muiItem('pop to root', () {
+          Navigator.of(muiBuildContext).popUntilPath(rootContentPath);
+        });
+        muiItem('pop all', () {
+          ContentNavigator.of(muiBuildContext).transientPopAll();
+        });
+        muiItem('pop to root push page 1', () async {
+          Navigator.of(muiBuildContext).popUntilPath(rootContentPath);
+          await _pushPage1(muiBuildContext);
+        });
+        muiItem('pop all push page 1', () async {
+          ContentNavigator.of(muiBuildContext).transientPopAll();
+          await _pushPage1(muiBuildContext);
+        });
+      });
+    });
+
+class Page1ContentPath extends ContentPathBase {
+  final part = ContentPathPart('page1');
+
+  @override
+  List<ContentPathField> get fields => [part];
+}
+
+class Page2ContentPath extends ContentPathBase {
+  final part = ContentPathPart('page2');
+
+  @override
+  List<ContentPathField> get fields => [part];
+}
+
+var contentNavigatorDef =
+    ContentNavigatorDef(defs: [pageStartDef, page1Def, page2Def]);
+void runAppWithNavigator() {
+  runApp(ContentNavigator(
+      def: contentNavigatorDef,
+      child: Builder(builder: (context) {
+        var cn = ContentNavigator.of(context);
+        return MaterialApp.router(
+          debugShowCheckedModeBanner: false,
+          title: 'Navigator',
+          //navigatorObservers: [cn.routeObserver],
+          routerDelegate: cn.routerDelegate,
+          routeInformationParser: cn.routeInformationParser,
+        );
+      })));
+}

example/navigator_test_app_lib/pubspec.yaml

@@ -25,13 +25,21 @@ dependencies:
       ref: dart3a
       path: test_menu_flutter
     version: '>=0.2.3'
+  tekartik_app_flutter_widget:
+    git:
+      url: https://github.com/tekartik/app_flutter_utils.dart
+      ref: dart3a
+      path: app_widget
+    version: '>=0.2.1'
 
 dev_dependencies:
   flutter_test:
     sdk: flutter
 
 
 dependency_overrides:
+  tekartik_app_flutter_widget:
+    path: ../../app_widget
   tekartik_app_navigator_flutter:
     path: ../../app_navigator
 flutter: