Places demo game in a OneChildRenderObjectWrapper and adds a star field and nebula for background

sky/examples/game/main.dart

 import 'dart:sky';
 import 'lib/game_demo.dart';
 import 'lib/sprites.dart';
+import 'package:sky/widgets/basic.dart';
 import 'package:sky/app/view.dart';
+import 'package:sky/widgets/ui_node.dart';
+import 'package:sky/widgets/raised_button.dart';
 
 AppView app;
 
 void main() {
   // Load images
   new ImageMap([
       "https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/resources-auto/BurnTexture.png",
       "https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/asteroid_big_002.png",
       "https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/GG_blueship_Lv3.png",
       "https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/laserBlue.png",
+      "https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Packages/SpriteBuilder%20Resources.sbpack/Sprites/resources-auto/laserFlashPurple.png",
+      "https://raw.githubusercontent.com/slembcke/GalacticGuardian.spritebuilder/GDC/Source/Resources/NebulaClouds.png",
     ],
     allLoaded);
 }
 
 void allLoaded(ImageMap loader) {
-  app = new AppView(root: (new GameDemoBox(new GameDemoWorld(loader))));
+  _loader = loader;
+  new GameDemoApp();
 }
+
+class GameDemoApp extends App {
+
+  UINode build() {
+    return new Stack([
+      new GameDemo(),
+//      new StackPositionedChild(

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StackPositionedChild -> Positioned

+//        new Flex([

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child: new Flex([

+//          new FlexExpandingChild(

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FlexExpandingChild -> Flexible

+//            new RaisedButton(child:new Text("Hello")),

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child: new RaisedButton(child:new Text("Hello")),

+//            key: 1

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key: 'hello'

+//          ),
+//          new FlexExpandingChild(

[abarth-chromium, 2015/06/16 17:37:01]

FlexExpandingChild -> Flexible

+//            new RaisedButton(child:new Text("Foo!")),

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child: new RaisedButton(child:new Text("Foo!")),

+//            key: 2

[abarth-chromium, 2015/06/16 17:37:01]

key: 'foo!'

+//          )
+//        ]),
+//        right:0.0,
+//        top: 20.0
+//      )
+    ]);
+  }
+}
+
+ImageMap _loader;
+
+class GameDemo extends OneChildRenderObjectWrapper {
+
+  GameDemo({ UINode child, Object key })
+  : super(child: child, key: key);
+
+  GameDemoBox get root { return super.root; }
+  GameDemoBox createNode() => new GameDemoBox(new GameDemoWorld(_loader));
+}