Support for icon theming

sky/sdk/lib/widgets/tool_bar.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 'package:sky/widgets/theme.dart';
 
+import '../painting/text_style.dart';
 import '../rendering/flex.dart';
 import '../theme/shadows.dart';
+import '../theme/typography.dart' as typography;
 import '../theme/view_configuration.dart';
 import 'basic.dart';
 import 'default_text_style.dart';
+import 'icon.dart';
 
 class ToolBar extends Component {
 
   ToolBar({
     String key,
     this.left,
     this.center,
     this.right,
     this.backgroundColor
   }) : super(key: key);
 
   final Widget left;
   final Widget center;
   final List<Widget> right;
   final Color backgroundColor;
 
   Widget build() {
+    Color toolbarColor = backgroundColor;
+    IconThemeColor iconThemeColor = IconThemeColor.white;
+    TextStyle defaultTextStyle = typography.white.title;
+    if (toolbarColor == null) {
+      ThemeData themeData = Theme.of(this);
+      toolbarColor = themeData.primaryColor;
+      if (themeData.primaryColorBrightness == ThemeBrightness.light) {
+        iconThemeColor = IconThemeColor.black;
+        defaultTextStyle = typography.black.title;
+      }
+    }
+
     List<Widget> children = new List<Widget>();
     if (left != null)
       children.add(left);
 
     if (center != null) {
       children.add(
         new Flexible(
           child: new Padding(
             child: new DefaultTextStyle(
-              style: Theme.of(this).toolbarText.title,
+              style: defaultTextStyle,
               child: center
             ),
             padding: new EdgeDims.only(left: 24.0)
           )
         )
       );
     }
 
     if (right != null)
       children.addAll(right);
 
     return new Container(
-      child: new Flex(
-        [new Container(child: new Flex(children), height: kToolBarHeight)],
-        alignItems: FlexAlignItems.flexEnd
+      child: new IconTheme(
+        data: new IconThemeData(color: iconThemeColor),
+        child: new Flex(
+          [new Container(child: new Flex(children), height: kToolBarHeight)],
+          alignItems: FlexAlignItems.flexEnd
+        )
       ),
       padding: new EdgeDims.symmetric(horizontal: 8.0),
       decoration: new BoxDecoration(
-        backgroundColor: backgroundColor == null ? Theme.of(this).primaryColor : backgroundColor,
+        backgroundColor: toolbarColor,
         boxShadow: shadows[2]
       )
     );
   }
 
 }