Make the checkbox in settings control the radio buttons in the drawer, to demonstrate how to link s…

sky/examples/stocks2/lib/stock_app.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/rendering/sky_binding.dart';
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/theme/theme_data.dart';
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/widgets/navigator.dart';
 import 'package:sky/widgets/theme.dart';
 import 'package:sky/widgets/widget.dart';
 
 import 'stock_data.dart';
 import 'stock_home.dart';
 import 'stock_settings.dart';
 
 class StocksApp extends App {
 
+  NavigationState _navigationState;
   StocksApp() {
     _navigationState = new NavigationState([
       new Route(
         name: '/', 
-        builder: (navigator, route) => new StockHome(navigator, route, _stocks)
+        builder: (navigator, route) => new StockHome(navigator, _stocks, stockMode, modeUpdater)
       ),
       new Route(
         name: '/settings',
-        builder: (navigator, route) => new StockSettings(navigator)
+        builder: (navigator, route) => new StockSettings(navigator, stockMode, settingsUpdater)
       ),
     ]);
   }
 
+  void onBack() {
+    setState(() {
+      _navigationState.pop();
+    });
+    // TODO(jackson): Need a way to invoke default back behavior here
+  }
+
+  StockMode stockMode = StockMode.optimistic;
+  void modeUpdater(StockMode value) {
+    setState(() {
+      stockMode = value;
+    });
+  }
+  void settingsUpdater({StockMode mode}) {
+    setState(() {
+      if (mode != null)
+        stockMode = mode;
+    });
+  }
+
+  final List<Stock> _stocks = [];
   void didMount() {
     super.didMount();
     new StockDataFetcher((StockData data) {
       setState(() {
         data.appendTo(_stocks);
       });
     });
   }
 
-  final List<Stock> _stocks = [];
-  NavigationState _navigationState;
-
-  void onBack() {
-    setState(() {
-      _navigationState.pop();
-    });
-    // TODO(jackson): Need a way to invoke default back behavior here
-  }
-
   Widget build() {
     return new Theme(
       data: new ThemeData.light(
         primary: colors.Purple,
         accent: colors.RedAccent,
         darkToolbar: true),
       child: new Navigator(_navigationState)
     );
   }
 }
 
 void main() {
   print("starting stocks app!");
   runApp(new StocksApp());
   SkyBinding.instance.onFrame = () {
     // uncomment this for debugging:
     // SkyBinding.instance.debugDumpRenderTree();
   };
 }