Adds more a11y use cases (#136761)

dev/a11y_assessments/lib/main.dart

@@ -44,9 +44,22 @@ class App extends StatelessWidget {
   }
 }
 
-class HomePage extends StatelessWidget {
+class HomePage extends StatefulWidget {
   const HomePage({super.key});
 
+  @override
+  State<HomePage> createState() => HomePageState();
+}
+
+class HomePageState extends State<HomePage> {
+  final ScrollController scrollController = ScrollController();
+
+  @override
+  void dispose() {
+    scrollController.dispose();
+    super.dispose();
+  }
+
   Widget _buildUseCaseItem(int index, UseCase useCase) {
     return Padding(
       padding: const EdgeInsets.all(10),
@@ -69,6 +82,7 @@ class HomePage extends StatelessWidget {
       appBar: AppBar(title: const Text('Accessibility Assessments')),
       body: Center(
         child: ListView(
+          controller: scrollController,
           children: List<Widget>.generate(
             useCases.length,
             (int index) => _buildUseCaseItem(index, useCases[index]),

dev/a11y_assessments/lib/use_cases/auto_complete.dart

@@ -0,0 +1,75 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'use_cases.dart';
+
+class AutoCompleteUseCase extends UseCase {
+
+  @override
+  String get name => 'AutoComplete';
+
+  @override
+  String get route => '/auto-complete';
+
+  @override
+  Widget build(BuildContext context) => const _MainWidget();
+}
+
+class _MainWidget extends StatefulWidget {
+  const _MainWidget();
+
+  @override
+  State<_MainWidget> createState() => _MainWidgetState();
+}
+
+class _MainWidgetState extends State<_MainWidget> {
+  static const List<String> _kOptions = <String>[
+    'apple',
+    'banana',
+    'lemon',
+  ];
+
+  static Widget _fieldViewBuilder(BuildContext context, TextEditingController textEditingController, FocusNode focusNode, VoidCallback onFieldSubmitted) {
+    return TextFormField(
+      focusNode: focusNode,
+      autofocus: true,
+      controller: textEditingController,
+      onFieldSubmitted: (String value) {
+        onFieldSubmitted();
+      },
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        title: const Text('AutoComplete'),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            Text(
+                'Type below to autocomplete the following possible results: $_kOptions.'),
+            Autocomplete<String>(
+              optionsBuilder: (TextEditingValue textEditingValue) {
+                if (textEditingValue.text == '') {
+                  return const Iterable<String>.empty();
+                }
+                return _kOptions.where((String option) {
+                  return option.contains(textEditingValue.text.toLowerCase());
+                });
+              },
+              fieldViewBuilder: _fieldViewBuilder,
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

dev/a11y_assessments/lib/use_cases/badge.dart

@@ -0,0 +1,49 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'use_cases.dart';
+
+class BadgeUseCase extends UseCase {
+
+  @override
+  String get name => 'Badge';
+
+  @override
+  String get route => '/badge';
+
+  @override
+  Widget build(BuildContext context) => const MainWidget();
+}
+
+class MainWidget extends StatefulWidget {
+  const MainWidget({super.key});
+
+  @override
+  State<MainWidget> createState() => MainWidgetState();
+}
+
+class MainWidgetState extends State<MainWidget> {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        title: const Text('Badge'),
+      ),
+      body: const Center(
+        child: Badge(
+          label: Text(
+            '5',
+            semanticsLabel: '5 new messages',
+            style: TextStyle(color: Colors.white),
+          ),
+          backgroundColor: Colors.green,
+          child: Icon(Icons.mail, semanticLabel: 'Messages'),
+        ),
+      ),
+    );
+  }
+}

dev/a11y_assessments/lib/use_cases/material_banner.dart

@@ -0,0 +1,74 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'use_cases.dart';
+
+class MaterialBannerUseCase extends UseCase {
+
+  @override
+  String get name => 'MaterialBanner';
+
+  @override
+  String get route => '/material_banner';
+
+  @override
+  Widget build(BuildContext context) => const MainWidget();
+}
+
+class MainWidget extends StatefulWidget {
+  const MainWidget({super.key});
+
+  @override
+  State<MainWidget> createState() => MainWidgetState();
+}
+
+class MainWidgetState extends State<MainWidget> {
+  double currentSliderValue = 20;
+  ScaffoldFeatureController<MaterialBanner, MaterialBannerClosedReason>? controller;
+
+  @override
+  Widget build(BuildContext context) {
+    VoidCallback? onPress;
+    if (controller == null) {
+      onPress = () {
+        setState(() {
+          controller = ScaffoldMessenger.of(context).showMaterialBanner(
+            MaterialBanner(
+              padding: const EdgeInsets.all(20),
+              content: const Text('Hello, I am a Material Banner'),
+              leading: const Icon(Icons.agriculture_outlined),
+              backgroundColor: Colors.green,
+              actions: <Widget>[
+                TextButton(
+                  onPressed: () {
+                    controller!.close();
+                    setState(() {
+                      controller = null;
+                    });
+                  },
+                  child: const Text('DISMISS'),
+                ),
+              ],
+            ),
+          );
+        });
+      };
+    }
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        title: const Text('MaterialBanner'),
+      ),
+      body: Center(
+        child: ElevatedButton(
+          autofocus: true,
+          onPressed: onPress,
+          child: const Text('Show a MaterialBanner'),
+        ),
+      ),
+    );
+  }
+}

dev/a11y_assessments/lib/use_cases/navigation_bar.dart

@@ -0,0 +1,79 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'use_cases.dart';
+
+class NavigationBarUseCase extends UseCase {
+
+  @override
+  String get name => 'NavigationBar';
+
+  @override
+  String get route => '/navigation-bar';
+
+  @override
+  Widget build(BuildContext context) => const MainWidget();
+}
+
+class MainWidget extends StatefulWidget {
+  const MainWidget({super.key});
+
+  @override
+  State<MainWidget> createState() => MainWidgetState();
+}
+
+class MainWidgetState extends State<MainWidget> {
+  int currentPageIndex = 0;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        title: const Text('NavigationBar'),
+      ),
+      bottomNavigationBar: NavigationBar(
+        onDestinationSelected: (int index) {
+          setState(() {
+            currentPageIndex = index;
+          });
+        },
+        indicatorColor: Colors.amber[800],
+        selectedIndex: currentPageIndex,
+        destinations: const <Widget>[
+          NavigationDestination(
+            selectedIcon: Icon(Icons.home),
+            icon: Icon(Icons.home_outlined),
+            label: 'Home',
+          ),
+          NavigationDestination(
+            icon: Icon(Icons.business),
+            label: 'Business',
+          ),
+          NavigationDestination(
+            selectedIcon: Icon(Icons.school),
+            icon: Icon(Icons.school_outlined),
+            label: 'School',
+          ),
+        ],
+      ),
+      body: <Widget>[
+        Container(
+          alignment: Alignment.center,
+          child: const Text('Page 1'),
+        ),
+        Container(
+          alignment: Alignment.center,
+          child: const Text('Page 2'),
+        ),
+        Container(
+          alignment: Alignment.center,
+          child: const Text('Page 3'),
+        ),
+      ][currentPageIndex],
+    );
+  }
+}

dev/a11y_assessments/lib/use_cases/text_button.dart

@@ -0,0 +1,55 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/material.dart';
+
+import 'use_cases.dart';
+
+class TextButtonUseCase extends UseCase {
+
+  @override
+  String get name => 'TextButton';
+
+  @override
+  String get route => '/text-button';
+
+  @override
+  Widget build(BuildContext context) => const MainWidget();
+}
+
+class MainWidget extends StatefulWidget {
+  const MainWidget({super.key});
+
+  @override
+  State<MainWidget> createState() => MainWidgetState();
+}
+
+class MainWidgetState extends State<MainWidget> {
+  double currentSliderValue = 20;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+        title: const Text('TextButton'),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            TextButton(
+              onPressed: () {  },
+              child: const Text('Text button'),
+            ),
+            const TextButton(
+              onPressed: null,
+              child: Text('Text button disabled'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

dev/a11y_assessments/lib/use_cases/use_cases.dart

@@ -4,10 +4,15 @@
 
 import 'package:flutter/widgets.dart';
 
+import 'auto_complete.dart';
+import 'badge.dart';
 import 'check_box_list_tile.dart';
 import 'date_picker.dart';
 import 'dialog.dart';
+import 'material_banner.dart';
+import 'navigation_bar.dart';
 import 'slider.dart';
+import 'text_button.dart';
 import 'text_field.dart';
 import 'text_field_password.dart';
 
@@ -24,4 +29,9 @@ final List<UseCase> useCases = <UseCase>[
   TextFieldUseCase(),
   TextFieldPasswordUseCase(),
   DatePickerUseCase(),
+  AutoCompleteUseCase(),
+  BadgeUseCase(),
+  MaterialBannerUseCase(),
+  NavigationBarUseCase(),
+  TextButtonUseCase(),
 ];