Implement RenderImage and Image for Sky

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 'package:sky/framework/rendering/box.dart';
+
+class RenderSolidColorBox extends RenderDecoratedBox {
+  final Size desiredSize;
+  final Color backgroundColor;
+
+  RenderSolidColorBox(Color backgroundColor, { this.desiredSize: const Size.infinite() })
+      : backgroundColor = backgroundColor,
+        super(decoration: new BoxDecoration(backgroundColor: backgroundColor));
+
+  Size getIntrinsicDimensions(BoxConstraints constraints) {
+    return constraints.constrain(desiredSize);
+  }
+
+  void performLayout() {
+    size = constraints.constrain(desiredSize);
+  }
+
+  void handlePointer(PointerEvent event) {
+    if (event.type == 'pointerdown')
+      decoration = new BoxDecoration(backgroundColor: const Color(0xFFFF0000));
+    else if (event.type == 'pointerup')
+      decoration = new BoxDecoration(backgroundColor: backgroundColor);
+  }
+}