[Effen] Use the checkbox widget in the stocks app.

sky/framework/fn.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.
 
 library fn;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:sky' as sky;
 import 'reflect.dart' as reflect;
@@ skipping 302 matching lines @@
 
   void _sync(UINode old, RenderCSSContainer host, RenderCSS insertBefore) {
     for (var type in listeners.keys) {
       _ensureDocumentListener(type);
     }
 
     super._sync(old, host, insertBefore);
   }
 }
 
-class Text extends SkyNodeWrapper {
-  final String data;
-
-  // Text nodes are special cases of having non-unique keys (which don't need
-  // to be assigned as part of the API). Since they are unique in not having
-  // children, there's little point to reordering, so we always just re-assign
-  // the data.
-  Text(this.data) : super(key:'*text*');
-
-  static final Text _emptyText = new Text(null);
-
-  SkyNodeWrapper get _emptyNode => _emptyText;
-
-  RenderCSSText _root;
-  RenderCSS _createNode() {
-    return new RenderCSSText(this, this.data);
-  }
-
-  void _syncNode(SkyNodeWrapper old) {
-    if (old == _emptyText)
-      return; // we set inside _createNode();
-    _root.data = data;
-  }
-}
-
 final List<UINode> _emptyList = new List<UINode>();
 
 abstract class SkyElementWrapper extends SkyNodeWrapper {
 
   final List<UINode> children;
   final Style style;
   final String inlineStyle;
 
   SkyElementWrapper({
     Object key,
@@ skipping 229 matching lines @@
     style: style,
     inlineStyle: inlineStyle
   );
 
   void _syncNode(UINode old) {
     super._syncNode(old);
     _root.direction = direction;
   }
 }
 
+class Text extends SkyElementWrapper {
+
+  RenderCSSText _root;
+  RenderCSSText _createNode() => new RenderCSSText(this, this.data);
+
+  static final Text _emptyText = new Text('');
+
+  SkyNodeWrapper get _emptyNode => _emptyText;
+
+  final String data;
+
+  // Text nodes are special cases of having non-unique keys (which don't need
+  // to be assigned as part of the API). Since they are unique in not having
+  // children, there's little point to reordering, so we always just re-assign
+  // the data.
+  Text(this.data, {
+    Style style,
+    String inlineStyle
+  }) : super(
+    key: '*text*',
+    style: style,
+    inlineStyle: inlineStyle
+  );
+
+  void _syncNode(UINode old) {
+    super._syncNode(old);
+    _root.data = data;
+  }
+}
+
 class Image extends SkyElementWrapper {
 
   RenderCSSImage _root;
   RenderCSSImage _createNode() => new RenderCSSImage(this, this.src, this.width, this.height);
 
   static final Image _emptyImage = new Image();
 
   SkyNodeWrapper get _emptyNode => _emptyImage;
 
   final String src;
@@ skipping 241 matching lines @@
   }
 
   void _buildIfDirty() {
     if (!_dirty || _defunct)
       return;
 
     _trace('$_key rebuilding...');
     _sync(null, _host, _root);
   }
 }