Spinning Square example for the RenderObject API.

sky/examples/lib/solid_color_box.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 'dart:sky';
+import 'dart:sky' as sky;
+import 'package:sky/framework/rendering/object.dart';
 import 'package:sky/framework/rendering/box.dart';
 
 class RenderSolidColorBox extends RenderDecoratedBox {
   final Size desiredSize;
   final Color backgroundColor;
 
   RenderSolidColorBox(Color backgroundColor, { this.desiredSize: Size.infinite })
       : backgroundColor = backgroundColor,
         super(decoration: new BoxDecoration(backgroundColor: backgroundColor));
 
@@ skipping 18 matching lines @@
   double getMaxIntrinsicHeight(BoxConstraints constraints) {
     return constraints.constrainHeight(
       this.desiredSize == Size.infinite ? 0.0 : desiredSize.height
     );
   }
 
   void performLayout() {
     size = constraints.constrain(desiredSize);
   }
 
-  void handlePointer(PointerEvent event) {
+  void handleEvent(sky.Event event, BoxHitTestEntry entry) {
     if (event.type == 'pointerdown')
       decoration = new BoxDecoration(backgroundColor: const Color(0xFFFF0000));
     else if (event.type == 'pointerup')
       decoration = new BoxDecoration(backgroundColor: backgroundColor);
   }
-}
+}