Make web buttons respond to enter key (#72162)

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

@@ -1113,6 +1113,9 @@ class _DropdownButtonState<T> extends State<DropdownButton<T>> with WidgetsBindi
       ActivateIntent: CallbackAction<ActivateIntent>(
         onInvoke: (ActivateIntent intent) => _handleTap(),
       ),
+      ButtonActivateIntent: CallbackAction<ButtonActivateIntent>(
+        onInvoke: (ButtonActivateIntent intent) => _handleTap(),
+      ),
     };
     focusNode!.addListener(_handleFocusChanged);
     final FocusManager focusManager = WidgetsBinding.instance!.focusManager;

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

@@ -734,6 +734,7 @@ class _InkResponseState extends State<_InkResponseStateWidget>
   final Map<_HighlightType, InkHighlight?> _highlights = <_HighlightType, InkHighlight?>{};
   late final Map<Type, Action<Intent>> _actionMap = <Type, Action<Intent>>{
     ActivateIntent: CallbackAction<ActivateIntent>(onInvoke: _simulateTap),
+    ButtonActivateIntent: CallbackAction<ButtonActivateIntent>(onInvoke: _simulateTap),
   };
 
   bool get highlightsExist => _highlights.values.where((InkHighlight? highlight) => highlight != null).isNotEmpty;
@@ -756,7 +757,7 @@ class _InkResponseState extends State<_InkResponseStateWidget>
   }
   bool get _anyChildInkResponsePressed => _activeChildren.isNotEmpty;
 
-  void _simulateTap([ActivateIntent? intent]) {
+  void _simulateTap([Intent? intent]) {
     _startSplash(context: context);
     _handleTap();
   }

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

@@ -1248,12 +1248,41 @@ class DoNothingAction extends Action<Intent> {
   void invoke(Intent intent) {}
 }
 
-/// An intent that activates the currently focused control.
+/// An [Intent] that activates the currently focused control.
+///
+/// This intent is bound by default to the [LogicalKeyboardKey.space] key on all
+/// platforms, and also to the [LogicalKeyboardKey.enter] key on all platforms
+/// except the web, where ENTER doesn't toggle selection. On the web, ENTER is
+/// bound to [ButtonActivateIntent] instead.
+///
+/// See also:
+///
+///  * [WidgetsApp.defaultShortcuts], which contains the default shortcuts used
+///    in apps.
+///  * [WidgetsApp.shortcuts], which defines the shortcuts to use in an
+///    application (and defaults to [WidgetsApp.defaultShortcuts]).
 class ActivateIntent extends Intent {
   /// Creates a const [ActivateIntent] so subclasses can be const.
   const ActivateIntent();
 }
 
+/// An [Intent] that activates the currently focused button.
+///
+/// This intent is bound by default to the [LogicalKeyboardKey.enter] key on the
+/// web, where ENTER can be used to activate buttons, but not toggle selection.
+/// All other platforms bind [LogicalKeyboardKey.enter] to [ActivateIntent].
+///
+/// See also:
+///
+///  * [WidgetsApp.defaultShortcuts], which contains the default shortcuts used
+///    in apps.
+///  * [WidgetsApp.shortcuts], which defines the shortcuts to use in an
+///    application (and defaults to [WidgetsApp.defaultShortcuts]).
+class ButtonActivateIntent extends Intent {
+  /// Creates a const [ButtonActivateIntent] so subclasses can be const.
+  const ButtonActivateIntent();
+}
+
 /// An action that activates the currently focused control.
 ///
 /// This is an abstract class that serves as a base class for actions that

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

@@ -1028,6 +1028,8 @@ class WidgetsApp extends StatefulWidget {
   static final Map<LogicalKeySet, Intent> _defaultWebShortcuts = <LogicalKeySet, Intent>{
     // Activation
     LogicalKeySet(LogicalKeyboardKey.space): const ActivateIntent(),
+    // On the web, enter activates buttons, but not other controls.
+    LogicalKeySet(LogicalKeyboardKey.enter): const ButtonActivateIntent(),
 
     // Dismissal
     LogicalKeySet(LogicalKeyboardKey.escape): const DismissIntent(),
@@ -1046,7 +1048,7 @@ class WidgetsApp extends StatefulWidget {
   };
 
   // Default shortcuts for the macOS platform.
-  static final Map<LogicalKeySet, Intent> _defaultMacOsShortcuts = <LogicalKeySet, Intent>{
+  static final Map<LogicalKeySet, Intent> _defaultAppleOsShortcuts = <LogicalKeySet, Intent>{
     // Activation
     LogicalKeySet(LogicalKeyboardKey.enter): const ActivateIntent(),
     LogicalKeySet(LogicalKeyboardKey.space): const ActivateIntent(),
@@ -1086,13 +1088,10 @@ class WidgetsApp extends StatefulWidget {
       case TargetPlatform.linux:
       case TargetPlatform.windows:
         return _defaultShortcuts;
-      case TargetPlatform.macOS:
-        return _defaultMacOsShortcuts;
       case TargetPlatform.iOS:
-        // No keyboard support on iOS yet.
-        break;
+      case TargetPlatform.macOS:
+        return _defaultAppleOsShortcuts;
     }
-    return <LogicalKeySet, Intent>{};
   }
 
   /// The default value of [WidgetsApp.actions].

packages/flutter/test/material/dropdown_test.dart

@@ -2358,7 +2358,7 @@ void main() {
     expect(find.byKey(buttonKey), isNot(paints ..rrect(rrect: const RRect.fromLTRBXY(0.0, 0.0, 104.0, 48.0, 4.0, 4.0), color: const Color(0xff00ff00))));
   });
 
-  testWidgets('DropdownButton is activated with the enter/space key', (WidgetTester tester) async {
+  testWidgets('DropdownButton is activated with the enter key', (WidgetTester tester) async {
     final FocusNode focusNode = FocusNode(debugLabel: 'DropdownButton');
     String? value = 'one';
 
@@ -2397,15 +2397,69 @@ void main() {
     await tester.pump(); // Pump a frame for autofocus to take effect.
     expect(focusNode.hasPrimaryFocus, isTrue);
 
-    // Web doesn't respond to enter, only space.
-    await tester.sendKeyEvent(kIsWeb ? LogicalKeyboardKey.space : LogicalKeyboardKey.enter);
+    await tester.sendKeyEvent(LogicalKeyboardKey.enter);
+    await tester.pump();
+    await tester.pump(const Duration(seconds: 1)); // finish the menu animation
+    expect(value, equals('one'));
+
+    await tester.sendKeyEvent(LogicalKeyboardKey.tab); // Focus 'two'
+    await tester.pump();
+    await tester.sendKeyEvent(LogicalKeyboardKey.enter); // Select 'two'.
+    await tester.pump();
+
+    await tester.pump();
+    await tester.pump(const Duration(seconds: 1)); // finish the menu animation
+
+    expect(value, equals('two'));
+  });
+
+  testWidgets('DropdownButton is activated with the space key', (WidgetTester tester) async {
+    final FocusNode focusNode = FocusNode(debugLabel: 'DropdownButton');
+    String? value = 'one';
+
+    Widget buildFrame() {
+      return MaterialApp(
+        home: Scaffold(
+          body: Center(
+            child: StatefulBuilder(
+              builder: (BuildContext context, StateSetter setState) {
+                return DropdownButton<String>(
+                  focusNode: focusNode,
+                  autofocus: true,
+                  onChanged: (String? newValue) {
+                    setState(() {
+                      value = newValue;
+                    });
+                  },
+                  value: value,
+                  itemHeight: null,
+                  items: menuItems.map<DropdownMenuItem<String>>((String item) {
+                    return DropdownMenuItem<String>(
+                      key: ValueKey<String>(item),
+                      value: item,
+                      child: Text(item, key: ValueKey<String>(item + 'Text')),
+                    );
+                  }).toList(),
+                );
+              },
+            ),
+          ),
+        ),
+      );
+    }
+
+    await tester.pumpWidget(buildFrame());
+    await tester.pump(); // Pump a frame for autofocus to take effect.
+    expect(focusNode.hasPrimaryFocus, isTrue);
+
+    await tester.sendKeyEvent(LogicalKeyboardKey.space);
     await tester.pump();
     await tester.pump(const Duration(seconds: 1)); // finish the menu animation
     expect(value, equals('one'));
 
     await tester.sendKeyEvent(LogicalKeyboardKey.tab); // Focus 'two'
     await tester.pump();
-    await tester.sendKeyEvent(LogicalKeyboardKey.enter); // Select 'two', should work on web too.
+    await tester.sendKeyEvent(LogicalKeyboardKey.space); // Select 'two'.
     await tester.pump();
 
     await tester.pump();

packages/flutter/test/material/ink_well_test.dart

@@ -4,6 +4,7 @@
 
 import 'package:flutter/material.dart';
 import 'package:flutter/rendering.dart';
+import 'package:flutter/src/services/keyboard_key.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:flutter/gestures.dart';
 
@@ -75,6 +76,38 @@ void main() {
     expect(log, equals(<String>['tap-down', 'tap-cancel']));
   });
 
+  testWidgets('InkWell invokes activation actions when expected', (WidgetTester tester) async {
+    final List<String> log = <String>[];
+
+    await tester.pumpWidget(Directionality(
+      textDirection: TextDirection.ltr,
+      child: Shortcuts(
+        shortcuts: <LogicalKeySet, Intent>{
+          LogicalKeySet(LogicalKeyboardKey.space): const ActivateIntent(),
+          LogicalKeySet(LogicalKeyboardKey.enter): const ButtonActivateIntent(),
+        },
+        child: Material(
+          child: Center(
+            child: InkWell(
+              autofocus: true,
+              onTap: () {
+                log.add('tap');
+              },
+            ),
+          ),
+        ),
+      ),
+    ));
+
+    await tester.sendKeyEvent(LogicalKeyboardKey.space);
+    await tester.pump();
+    expect(log, equals(<String>['tap']));
+    log.clear();
+    await tester.sendKeyEvent(LogicalKeyboardKey.enter);
+    await tester.pump();
+    expect(log, equals(<String>['tap']));
+  });
+
   testWidgets('long-press and tap on disabled should not throw', (WidgetTester tester) async {
     await tester.pumpWidget(const Material(
       child: Directionality(