Rationalize Dart mojo and sky package structure

sky/framework/components/checkbox.dart

Index: sky/framework/components/checkbox.dart
diff --git a/sky/framework/components/checkbox.dart b/sky/framework/components/checkbox.dart
deleted file mode 100644
index 1924f5cd6b94b2ddb89b703dcc4cd1cf384c0088..0000000000000000000000000000000000000000
--- a/sky/framework/components/checkbox.dart
+++ /dev/null
@@ -1,87 +0,0 @@
-// 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 '../fn.dart';
-import '../layout.dart';
-import 'button_base.dart';
-import 'dart:sky' as sky;
-
-typedef void ValueChanged(value);
-
-class Checkbox extends ButtonBase {
-  static final Style _style = new Style('''
-    transform: translateX(0);
-    justify-content: center;
-    align-items: center;
-    -webkit-user-select: none;
-    cursor: pointer;
-    width: 30px;
-    height: 30px;'''
-  );
-
-  static final Style _containerStyle = new Style('''
-    border: solid 2px;
-    border-color: rgba(90, 90, 90, 0.25);
-    width: 10px;
-    height: 10px;'''
-  );
-
-  static final Style _containerHighlightStyle = new Style('''
-    border: solid 2px;
-    border-color: rgba(90, 90, 90, 0.25);
-    width: 10px;
-    height: 10px;
-    border-radius: 10px;
-    background-color: orange;
-    border-color: orange;'''
-  );
-
-  static final Style _uncheckedStyle = new Style('''
-    top: 0px;
-    left: 0px;'''
-  );
-
-  static final Style _checkedStyle = new Style('''
-    top: 0px;
-    left: 0px;
-    transform: translate(2px, -15px) rotate(45deg);
-    width: 10px;
-    height: 20px;
-    border-style: solid;
-    border-top: none;
-    border-left: none;
-    border-right-width: 2px;
-    border-bottom-width: 2px;
-    border-color: #0f9d58;'''
-  );
-
-  bool checked;
-  ValueChanged onChanged;
-
-  Checkbox({ Object key, this.onChanged, this.checked }) : super(key: key);
-
-  void _handleClick(sky.Event e) {
-    onChanged(!checked);
-  }
-
-  UINode buildContent() {
-    return new EventListenerNode(
-      new FlexContainer(
-        style: _style,
-        direction: FlexDirection.Row,
-        children: [
-          new Container(
-            style: highlight ? _containerHighlightStyle : _containerStyle,
-            children: [
-              new Container(
-                style: checked ? _checkedStyle : _uncheckedStyle
-              )
-            ]
-          )
-        ]
-      ),
-      onGestureTap: _handleClick
-    );
-  }
-}