enable use_enums (#117376)

analysis_options.yaml

@@ -223,7 +223,7 @@ linter:
     - use_build_context_synchronously
     # - use_colored_box # not yet tested
     # - use_decorated_box # leads to bugs: DecoratedBox and Container are not equivalent (Container inserts extra padding)
-    # - use_enums # not yet tested
+    - use_enums
     - use_full_hex_values_for_flutter_colors
     - use_function_type_syntax_for_parameters
     - use_if_null_to_convert_nulls_to_bools

packages/flutter/lib/src/services/hardware_keyboard.dart

@@ -26,34 +26,33 @@ export 'raw_keyboard.dart' show RawKeyEvent, RawKeyboard;
 /// Only a limited number of modes are supported, which are enumerated as
 /// static members of this class. Manual constructing of this class is
 /// prohibited.
-@immutable
-class KeyboardLockMode {
-  // KeyboardLockMode has a fixed pool of supported keys, enumerated as static
-  // members of this class, therefore constructing is prohibited.
-  const KeyboardLockMode._(this.logicalKey);
-
-  /// The logical key that triggers this lock mode.
-  final LogicalKeyboardKey logicalKey;
-
+enum KeyboardLockMode {
   /// Represents the number lock mode on the keyboard.
   ///
   /// On supporting systems, enabling number lock mode usually allows key
   /// presses of the number pad to input numbers, instead of acting as up, down,
   /// left, right, page up, end, etc.
-  static const KeyboardLockMode numLock = KeyboardLockMode._(LogicalKeyboardKey.numLock);
+  numLock._(LogicalKeyboardKey.numLock),
 
   /// Represents the scrolling lock mode on the keyboard.
   ///
   /// On supporting systems and applications (such as a spreadsheet), enabling
   /// scrolling lock mode usually allows key presses of the cursor keys to
   /// scroll the document instead of the cursor.
-  static const KeyboardLockMode scrollLock = KeyboardLockMode._(LogicalKeyboardKey.scrollLock);
+  scrollLock._(LogicalKeyboardKey.scrollLock),
 
   /// Represents the capital letters lock mode on the keyboard.
   ///
   /// On supporting systems, enabling capital lock mode allows key presses of
   /// the letter keys to input uppercase letters instead of lowercase.
-  static const KeyboardLockMode capsLock = KeyboardLockMode._(LogicalKeyboardKey.capsLock);
+  capsLock._(LogicalKeyboardKey.capsLock);
+
+  // KeyboardLockMode has a fixed pool of supported keys, enumerated as static
+  // members of this class, therefore constructing is prohibited.
+  const KeyboardLockMode._(this.logicalKey);
+
+  /// The logical key that triggers this lock mode.
+  final LogicalKeyboardKey logicalKey;
 
   static final Map<int, KeyboardLockMode> _knownLockModes = <int, KeyboardLockMode>{
     numLock.logicalKey.keyId: numLock,

packages/flutter_tools/lib/src/commands/daemon.dart

@@ -1565,14 +1565,11 @@ class LogMessage {
 }
 
 /// The method by which the Flutter app was launched.
-class LaunchMode {
-  const LaunchMode._(this._value);
-
-  /// The app was launched via `flutter run`.
-  static const LaunchMode run = LaunchMode._('run');
+enum LaunchMode {
+  run._('run'),
+  attach._('attach');
 
-  /// The app was launched via `flutter attach`.
-  static const LaunchMode attach = LaunchMode._('attach');
+  const LaunchMode._(this._value);
 
   final String _value;
 

packages/flutter_tools/lib/src/device.dart

@@ -23,20 +23,20 @@ import 'vmservice.dart';
 DeviceManager? get deviceManager => context.get<DeviceManager>();
 
 /// A description of the kind of workflow the device supports.
-class Category {
-  const Category._(this.value);
+enum Category {
+  web._('web'),
+  desktop._('desktop'),
+  mobile._('mobile');
 
-  static const Category web = Category._('web');
-  static const Category desktop = Category._('desktop');
-  static const Category mobile = Category._('mobile');
+  const Category._(this.value);
 
   final String value;
 
   @override
   String toString() => value;
 
   static Category? fromString(String category) {
-    return <String, Category>{
+    return const <String, Category>{
       'web': web,
       'desktop': desktop,
       'mobile': mobile,
@@ -45,25 +45,25 @@ class Category {
 }
 
 /// The platform sub-folder that a device type supports.
-class PlatformType {
-  const PlatformType._(this.value);
+enum PlatformType {
+  web._('web'),
+  android._('android'),
+  ios._('ios'),
+  linux._('linux'),
+  macos._('macos'),
+  windows._('windows'),
+  fuchsia._('fuchsia'),
+  custom._('custom');
 
-  static const PlatformType web = PlatformType._('web');
-  static const PlatformType android = PlatformType._('android');
-  static const PlatformType ios = PlatformType._('ios');
-  static const PlatformType linux = PlatformType._('linux');
-  static const PlatformType macos = PlatformType._('macos');
-  static const PlatformType windows = PlatformType._('windows');
-  static const PlatformType fuchsia = PlatformType._('fuchsia');
-  static const PlatformType custom = PlatformType._('custom');
+  const PlatformType._(this.value);
 
   final String value;
 
   @override
   String toString() => value;
 
   static PlatformType? fromString(String platformType) {
-    return <String, PlatformType>{
+    return const <String, PlatformType>{
       'web': web,
       'android': android,
       'ios': ios,