Add a new Theme widget to control color and text color of apps

R=abarth@chromium.org, abarth, hixie

Review URL: https://codereview.chromium.org/1194743003.

examples/stocks2/lib/stock_app.dart

@@ -3,8 +3,12 @@
 // 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/theme/typography.dart' as typography;
 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';
@@ -46,7 +50,10 @@ class StocksApp extends App {
   }
 
   Widget build() {
-    return new Navigator(_navigationState);
+    return new Theme(
+      data: new ThemeData(color: colors.Purple, text: typography.white),
+      child: new Navigator(_navigationState)
+    );
   }
 }
 

examples/stocks2/lib/stock_home.dart

@@ -169,8 +169,7 @@ class StockHome extends Component {
           new IconButton(
             icon: 'navigation/more_vert_white',
             onPressed: _handleMenuShow)
-        ],
-        backgroundColor: colors.Purple[500]
+        ]
       );
   }
 

examples/stocks2/lib/stock_settings.dart

@@ -3,13 +3,13 @@
 // found in the LICENSE file.
 
 import 'package:sky/theme/colors.dart' as colors;
-import 'package:sky/theme/typography.dart' as typography;
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/widgets/checkbox.dart';
 import 'package:sky/widgets/icon_button.dart';
 import 'package:sky/widgets/menu_item.dart';
 import 'package:sky/widgets/navigator.dart';
 import 'package:sky/widgets/scaffold.dart';
+import 'package:sky/widgets/theme.dart';
 import 'package:sky/widgets/tool_bar.dart';
 
 class StockSettings extends Component {
@@ -30,8 +30,7 @@ class StockSettings extends Component {
       left: new IconButton(
         icon: 'navigation/arrow_back_white',
         onPressed: _navigator.pop),
-      center: new Text('Settings', style: typography.white.title),
-      backgroundColor: colors.Purple[500]
+      center: new Text('Settings', style: Theme.of(this).text.title)
     );
   }
 

examples/widgets/sector.dart

@@ -7,13 +7,15 @@ import 'dart:math' as math;
 import 'package:sky/rendering/box.dart';
 import 'package:sky/rendering/flex.dart';
 import 'package:sky/rendering/sky_binding.dart';
-import 'package:sky/theme/colors.dart';
+import 'package:sky/theme/colors.dart' as colors;
 import 'package:sky/theme/edges.dart';
-import 'package:sky/theme/typography.dart';
+import 'package:sky/theme/theme_data.dart';
+import 'package:sky/theme/typography.dart' as typography;
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/widgets/material.dart';
 import 'package:sky/widgets/raised_button.dart';
 import 'package:sky/widgets/scaffold.dart';
+import 'package:sky/widgets/theme.dart';
 import 'package:sky/widgets/tool_bar.dart';
 import 'package:sky/widgets/widget.dart';
 
@@ -74,61 +76,63 @@ class SectorApp extends App {
   }
 
   Widget build() {
-    return new Scaffold(
-      toolbar: new ToolBar(
-          center: new Text('Sector Layout in a Widget Tree', style: white.title),
-          backgroundColor: Blue[500]),
-      body: new Material(
-        edge: MaterialEdge.canvas,
-        child: new Flex([
-            new Container(
-              padding: new EdgeDims.symmetric(horizontal: 8.0, vertical: 25.0),
-              child: new Flex([
-                  new RaisedButton(
-                    enabled: enabledAdd,
-                    child: new ShrinkWrapWidth(
-                      child: new Flex([
-                        new Container(
-                          padding: new EdgeDims.all(4.0),
-                          margin: new EdgeDims.only(right: 10.0),
-                          child: new WidgetToRenderBoxAdapter(sectorAddIcon)
-                        ),
-                        new Text('ADD SECTOR'),
-                      ])
+    return new Theme(
+      data: new ThemeData(color: colors.Blue, text: typography.white),
+      child: new Scaffold(
+        toolbar: new ToolBar(
+            center: new Text('Sector Layout in a Widget Tree', style: typography.white.title)),
+        body: new Material(
+          edge: MaterialEdge.canvas,
+          child: new Flex([
+              new Container(
+                padding: new EdgeDims.symmetric(horizontal: 8.0, vertical: 25.0),
+                child: new Flex([
+                    new RaisedButton(
+                      enabled: enabledAdd,
+                      child: new ShrinkWrapWidth(
+                        child: new Flex([
+                          new Container(
+                            padding: new EdgeDims.all(4.0),
+                            margin: new EdgeDims.only(right: 10.0),
+                            child: new WidgetToRenderBoxAdapter(sectorAddIcon)
+                          ),
+                          new Text('ADD SECTOR'),
+                        ])
+                      ),
+                      onPressed: addSector
                     ),
-                    onPressed: addSector
+                    new RaisedButton(
+                      enabled: enabledRemove,
+                      child: new ShrinkWrapWidth(
+                        child: new Flex([
+                          new Container(
+                            padding: new EdgeDims.all(4.0),
+                            margin: new EdgeDims.only(right: 10.0),
+                            child: new WidgetToRenderBoxAdapter(sectorRemoveIcon)
+                          ),
+                          new Text('REMOVE SECTOR'),
+                        ])
+                      ),
+                      onPressed: removeSector
+                    )
+                  ],
+                  justifyContent: FlexJustifyContent.spaceAround
+                )
+              ),
+              new Flexible(
+                child: new Container(
+                  margin: new EdgeDims.all(8.0),
+                  decoration: new BoxDecoration(
+                    border: new Border.all(new BorderSide(color: new Color(0xFF000000)))
                   ),
-                  new RaisedButton(
-                    enabled: enabledRemove,
-                    child: new ShrinkWrapWidth(
-                      child: new Flex([
-                        new Container(
-                          padding: new EdgeDims.all(4.0),
-                          margin: new EdgeDims.only(right: 10.0),
-                          child: new WidgetToRenderBoxAdapter(sectorRemoveIcon)
-                        ),
-                        new Text('REMOVE SECTOR'),
-                      ])
-                    ),
-                    onPressed: removeSector
-                  )
-                ],
-                justifyContent: FlexJustifyContent.spaceAround
-              )
-            ),
-            new Flexible(
-              child: new Container(
-                margin: new EdgeDims.all(8.0),
-                decoration: new BoxDecoration(
-                  border: new Border.all(new BorderSide(color: new Color(0xFF000000)))
-                ),
-                padding: new EdgeDims.all(8.0),
-                child: new WidgetToRenderBoxAdapter(sectors)
-              )
-            ),
-          ],
-          direction: FlexDirection.vertical,
-          justifyContent: FlexJustifyContent.spaceBetween
+                  padding: new EdgeDims.all(8.0),
+                  child: new WidgetToRenderBoxAdapter(sectors)
+                )
+              ),
+            ],
+            direction: FlexDirection.vertical,
+            justifyContent: FlexJustifyContent.spaceBetween
+          )
         )
       )
     );

examples/widgets/styled_text.dart

@@ -7,10 +7,12 @@ import 'package:sky/rendering/box.dart';
 import 'package:sky/rendering/flex.dart';
 import 'package:sky/rendering/sky_binding.dart';
 import 'package:sky/theme/colors.dart';
+import 'package:sky/theme/theme_data.dart';
 import 'package:sky/theme/typography.dart';
 import 'package:sky/widgets/basic.dart';
 import 'package:sky/widgets/material.dart';
 import 'package:sky/widgets/scaffold.dart';
+import 'package:sky/widgets/theme.dart';
 import 'package:sky/widgets/tool_bar.dart';
 import 'package:sky/widgets/widget.dart';
 
@@ -105,11 +107,13 @@ HAL: This mission is too important for me to allow you to jeopardize it.''';
       onPointerDown: toggleToTextFunction
     );
 
-    return new Scaffold(
-      body: new Material(child: interactiveBody),
-      toolbar: new ToolBar(
-        center: new Text('Hal and Dave', style: white.title),
-        backgroundColor: Blue[500]
+    return new Theme(
+      data: new ThemeData(color: Blue, text: white),
+      child: new Scaffold(
+        body: new Material(child: interactiveBody),
+        toolbar: new ToolBar(
+          center: new Text('Hal and Dave', style: white.title)
+        )
       )
     );
   }