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

sky/examples/stocks2/lib/stock_home.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/editing/input.dart';
 import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/widgets/drawer.dart';
 import 'package:sky/widgets/drawer_header.dart';
 import 'package:sky/widgets/floating_action_button.dart';
 import 'package:sky/widgets/icon.dart';
 import 'package:sky/widgets/icon_button.dart';
 import 'package:sky/widgets/menu_divider.dart';
 import 'package:sky/widgets/menu_item.dart';
 import 'package:sky/widgets/modal_overlay.dart';
 import 'package:sky/widgets/navigator.dart';
 import 'package:sky/widgets/popup_menu.dart';
 import 'package:sky/widgets/radio.dart';
 import 'package:sky/widgets/scaffold.dart';
 import 'package:sky/widgets/tool_bar.dart';
 import 'package:sky/widgets/widget.dart';
 
 import 'stock_data.dart';
 import 'stock_list.dart';
 import 'stock_menu.dart';
 
 enum StockMode { optimistic, pessimistic }
+typedef void ModeUpdater(StockMode mode);
 
 class StockHome extends Component {
 
-  StockHome(this.navigator, RouteBase route, this.stocks) : super(stateful: true) {
+  StockHome(this.navigator, this.stocks, this.stockMode, this.modeUpdater) : super(stateful: true) {
     // if (debug)
     //   new Timer(new Duration(seconds: 1), dumpState);
     _drawerController = new DrawerController(_handleDrawerStatusChanged);
   }
 
+  Navigator navigator;
+  List<Stock> stocks;
+  StockMode stockMode;
+  ModeUpdater modeUpdater;
+
   void syncFields(StockHome source) {
     navigator = source.navigator;
     stocks = source.stocks;
+    stockMode = source.stockMode;
+    modeUpdater = source.modeUpdater;
   }
 
-  Navigator navigator;
-  List<Stock> stocks;
-
   bool _isSearching = false;
   String _searchQuery;
 
   void _handleSearchBegin() {
     setState(() {
       _isSearching = true;
     });
   }
 
   void _handleSearchEnd() {
@@ skipping 40 matching lines @@
     });
   }
 
   bool _autorefresh = false;
   void _handleAutorefreshChanged(bool value) {
     setState(() {
       _autorefresh = value;
     });
   }
 
-  StockMode _stockMode = StockMode.optimistic;
   void _handleStockModeChange(StockMode value) {
     setState(() {
-      _stockMode = value;
+      stockMode = value;
     });
+    if (modeUpdater != null)
+      modeUpdater(value);
   }
 
   Drawer buildDrawer() {
     return new Drawer(
       controller: _drawerController,
       level: 3,
       children: [
         new DrawerHeader(children: [new Text('Stocks')]),
         new MenuItem(
           icon: 'action/assessment',
           children: [new Text('Stock List')]),
         new MenuItem(
           icon: 'action/account_balance',
           children: [new Text('Account Balance')]),
         new MenuDivider(),
         new MenuItem(
           icon: 'action/thumb_up',
           onPressed: () => _handleStockModeChange(StockMode.optimistic),
           children: [
             new Flexible(child: new Text('Optimistic')),
-            new Radio(value: StockMode.optimistic, groupValue: _stockMode, onChanged: _handleStockModeChange)
+            new Radio(value: StockMode.optimistic, groupValue: stockMode, onChanged: _handleStockModeChange)
           ]),
         new MenuItem(
           icon: 'action/thumb_down',
           onPressed: () => _handleStockModeChange(StockMode.pessimistic),
           children: [
             new Flexible(child: new Text('Pessimistic')),
-            new Radio(value: StockMode.pessimistic, groupValue: _stockMode, onChanged: _handleStockModeChange)
+            new Radio(value: StockMode.pessimistic, groupValue: stockMode, onChanged: _handleStockModeChange)
           ]),
         new MenuDivider(),
         new MenuItem(
           icon: 'action/settings',
           onPressed: () => navigator.pushNamed('/settings'),
           children: [new Text('Settings')]),
         new MenuItem(
           icon: 'action/help',
           children: [new Text('Help & Feedback')])
      ]
@@ skipping 58 matching lines @@
         floatingActionButton: new FloatingActionButton(
           child: new Icon(type: 'content/add_white', size: 24)
         ),
         drawer: _drawerShowing ? buildDrawer() : null
       ),
     ];
     addMenuToOverlays(overlays);
     return new Stack(overlays);
   }
 }