Wrapping leaf nodes in non polymer elements

runtime/observatory/lib/src/elements/isolate_ref.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library isolate_ref_element;
 
-import 'package:polymer/polymer.dart';
-import 'service_ref.dart';
+import 'dart:html';
+import 'dart:async';
+import 'package:observatory/repositories.dart'
+  show IsolateRef, IsolateUpdateEvent;
+import 'helpers/tag.dart';
 
-@CustomTag('isolate-ref')
-class IsolateRefElement extends ServiceRefElement {
-  IsolateRefElement.created() : super.created();
+class IsolateRefElement extends HtmlElement {
+  static final StyleElement _style = () {
+      var style = new StyleElement();
+      style.text = 'a.isolate-ref {'
+                   '  color: #0489c3;'
+                   '  text-decoration: none;'
+                   '}'
+                   'a.isolate-ref:hover {'
+                   '  text-decoration: underline;'
+                   '}';
+      return style;
+  }();
+
+  static const tag = const Tag<IsolateRefElement>('isolate-ref-wrapped');
+
+  Stream<IsolateUpdateEvent> _updates;
+  StreamSubscription _updatesSubscription;
+  IsolateRef _isolate;
+
+  IsolateRef get isolate => _isolate;
+
+  factory IsolateRefElement(IsolateRef isolate,
+    Stream<IsolateUpdateEvent> updates) {
+    assert(isolate != null);
+    assert(updates != null);
+    IsolateRefElement e = document.createElement(tag.name);
+    e._isolate = isolate;
+    e._updates = updates;
+    return e;
+  }
+
+  IsolateRefElement.created() : super.created() {
+    createShadowRoot();
+  }
+
+  @override
+  void attached() {
+    super.attached();
+    assert(_isolate != null);
+    assert(_updates != null);
+    render();
+    _updatesSubscription = _updates
+      .where((IsolateUpdateEvent e) => e.isolate.id == isolate.id)
+      .listen((IsolateUpdateEvent e) { _isolate = e.isolate; render(); });
+  }
+
+  @override
+  void detached() {
+    super.detached();
+    assert(_updatesSubscription != null);
+    _updatesSubscription.cancel();
+    _updatesSubscription = null;
+  }
+
+  void render() {
+    shadowRoot.children = [
+      _style.clone(true),
+      new AnchorElement(href:
+        '#/inspect?isolateId=${Uri.encodeComponent(isolate.id)}')
+        ..text = 'Isolate ${isolate.number} (${isolate.name})'
+        ..classes = ['isolate-ref']
+    ];
+  }
 }