Style guide says enum values should be lowerCamelCase.

sky/sdk/lib/framework/components2/ink_well.dart

 // Copyright 2015 The Chromium 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 '../fn2.dart';
 import '../rendering/flex.dart';
 import 'dart:collection';
 import 'dart:sky' as sky;
 // import 'ink_splash.dart';
 import 'scrollable.dart';
@@ skipping 10 matching lines @@
   // InkWell({ Object key, this.inlineStyle, this.children })
   //     : super(key: key) {
   //   onDidUnmount(() {
   //     _cancelSplashes(null);
   //   });
   // }
 
   InkWell({ Object key, this.children }) : super(key: key);
 
   UINode build() {
-    return new FlexContainer(direction: FlexDirection.Horizontal, children: children);
+    return new FlexContainer(direction: FlexDirection.horizontal, children: children);
     // List<UINode> childrenIncludingSplashes = [];
 
     // if (_splashes != null) {
     //   childrenIncludingSplashes.addAll(
     //       _splashes.map((s) => new InkSplash(s.onStyleChanged)));
     // }
 
     // if (children != null)
     //   childrenIncludingSplashes.addAll(children);
 
     // return new EventListenerNode(
     //   new FlexContainer(
-    //     direction: FlexDirection.Row,
+    //     direction: FlexDirection.horizontal,
     //     style: _containmentStyleHack,
     //     inlineStyle: inlineStyle,
     //     children: childrenIncludingSplashes),
     //   onGestureTapDown: _startSplash,
     //   onGestureTap: _confirmSplash
     // );
   }
 
   // void _startSplash(sky.GestureEvent event) {
   //   setState(() {
@@ skipping 57 matching lines @@
   // void _splashDone(SplashController splash) {
   //   if (_splashes == null)
   //     return;
   //   setState(() {
   //     _splashes.remove(splash);
   //     if (_splashes.length == 0)
   //       _splashes = null;
   //   });
   // }
 }