Menu bar accelerators (flutter#114852)

* Add MenuMenuAcceleratorLabel to support accelerators.

* Review Changes

* Review Changed

* Fix default label builder to use characters

* Remove golden test that shouldn't have been there.

Author: gspencergoog

dev/manual_tests/lib/menu_anchor.dart

@@ -0,0 +1,116 @@
+// 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.
+
+/// Flutter code sample for [MenuAcceleratorLabel].
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+
+void main() => runApp(const MenuAcceleratorApp());
+
+class MyMenuBar extends StatelessWidget {
+  const MyMenuBar({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: <Widget>[
+        Row(
+          mainAxisSize: MainAxisSize.min,
+          children: <Widget>[
+            Expanded(
+              child: MenuBar(
+                children: <Widget>[
+                  SubmenuButton(
+                    menuChildren: <Widget>[
+                      MenuItemButton(
+                        onPressed: () {
+                          showAboutDialog(
+                            context: context,
+                            applicationName: 'MenuBar Sample',
+                            applicationVersion: '1.0.0',
+                          );
+                        },
+                        child: const MenuAcceleratorLabel('&About'),
+                      ),
+                      MenuItemButton(
+                        onPressed: () {
+                          ScaffoldMessenger.of(context).showSnackBar(
+                            const SnackBar(
+                              content: Text('Saved!'),
+                            ),
+                          );
+                        },
+                        child: const MenuAcceleratorLabel('&Save'),
+                      ),
+                      MenuItemButton(
+                        onPressed: () {
+                          ScaffoldMessenger.of(context).showSnackBar(
+                            const SnackBar(
+                              content: Text('Quit!'),
+                            ),
+                          );
+                        },
+                        child: const MenuAcceleratorLabel('&Quit'),
+                      ),
+                    ],
+                    child: const MenuAcceleratorLabel('&File'),
+                  ),
+                  SubmenuButton(
+                    menuChildren: <Widget>[
+                      MenuItemButton(
+                        onPressed: () {
+                          ScaffoldMessenger.of(context).showSnackBar(
+                            const SnackBar(
+                              content: Text('Magnify!'),
+                            ),
+                          );
+                        },
+                        child: const MenuAcceleratorLabel('&Magnify'),
+                      ),
+                      MenuItemButton(
+                        onPressed: () {
+                          ScaffoldMessenger.of(context).showSnackBar(
+                            const SnackBar(
+                              content: Text('Minify!'),
+                            ),
+                          );
+                        },
+                        child: const MenuAcceleratorLabel('Mi&nify'),
+                      ),
+                    ],
+                    child: const MenuAcceleratorLabel('&View'),
+                  ),
+                ],
+              ),
+            ),
+          ],
+        ),
+        Expanded(
+          child: FlutterLogo(
+            size: MediaQuery.of(context).size.shortestSide * 0.5,
+          ),
+        ),
+      ],
+    );
+  }
+}
+
+class MenuAcceleratorApp extends StatelessWidget {
+  const MenuAcceleratorApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      home: Shortcuts(
+        shortcuts: <ShortcutActivator, Intent>{
+          const SingleActivator(LogicalKeyboardKey.keyT, control: true): VoidCallbackIntent(() {
+            debugDumpApp();
+          }),
+        },
+        child: const Scaffold(body: MyMenuBar()),
+      ),
+    );
+  }
+}

examples/api/lib/material/menu_anchor/menu_accelerator_label.0.dart

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-/// Flutter code sample for [MenuBar]
+/// Flutter code sample for [MenuBar].
 
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';

examples/api/lib/material/menu_anchor/menu_bar.0.dart

@@ -49,9 +49,9 @@ class _MyStatefulWidgetState extends State<MyStatefulWidget> {
   @override
   Widget build(BuildContext context) {
     return Shortcuts(
-      shortcuts: <ShortcutActivator, Intent>{
-        LogicalKeySet(LogicalKeyboardKey.arrowUp): const IncrementIntent(),
-        LogicalKeySet(LogicalKeyboardKey.arrowDown): const DecrementIntent(),
+      shortcuts: const <ShortcutActivator, Intent>{
+        SingleActivator(LogicalKeyboardKey.arrowUp): IncrementIntent(),
+        SingleActivator(LogicalKeyboardKey.arrowDown): DecrementIntent(),
       },
       child: Actions(
         actions: <Type, Action<Intent>>{

examples/api/lib/widgets/shortcuts/shortcuts.0.dart

@@ -0,0 +1,54 @@
+// 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 'package:flutter/services.dart';
+import 'package:flutter_api_samples/material/menu_anchor/menu_accelerator_label.0.dart' as example;
+import 'package:flutter_test/flutter_test.dart';
+
+void main() {
+  testWidgets('Can open menu', (WidgetTester tester) async {
+    Finder findMenu(String label) {
+      return find
+          .ancestor(
+            of: find.text(label, findRichText: true),
+            matching: find.byType(FocusScope),
+          )
+          .first;
+    }
+
+    await tester.pumpWidget(const example.MenuAcceleratorApp());
+
+    await tester.sendKeyDownEvent(LogicalKeyboardKey.altLeft);
+    await tester.pump();
+    await tester.sendKeyEvent(LogicalKeyboardKey.keyF, character: 'f');
+    await tester.pumpAndSettle();
+    await tester.pump();
+
+    expect(find.text('About', findRichText: true), findsOneWidget);
+    expect(
+      tester.getRect(findMenu('About')),
+      equals(const Rect.fromLTRB(4.0, 48.0, 98.0, 208.0)),
+    );
+    expect(find.text('Save', findRichText: true), findsOneWidget);
+    expect(find.text('Quit', findRichText: true), findsOneWidget);
+    expect(find.text('Magnify', findRichText: true), findsNothing);
+    expect(find.text('Minify', findRichText: true), findsNothing);
+
+    // Open the About dialog.
+    await tester.sendKeyEvent(LogicalKeyboardKey.keyA, character: 'a');
+    await tester.sendKeyUpEvent(LogicalKeyboardKey.altLeft);
+    await tester.pumpAndSettle();
+
+    expect(find.text('Save', findRichText: true), findsNothing);
+    expect(find.text('Quit', findRichText: true), findsNothing);
+    expect(find.text('Magnify', findRichText: true), findsNothing);
+    expect(find.text('Minify', findRichText: true), findsNothing);
+    expect(find.text('CLOSE'), findsOneWidget);
+
+    await tester.tap(find.text('CLOSE'));
+    await tester.pumpAndSettle();
+    expect(find.text('CLOSE'), findsNothing);
+  });
+}