Wrapping leaf nodes in non polymer elements

runtime/observatory/lib/src/elements/nav/class_menu.dart

+// Copyright (c) 2016, 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.
+
+import 'dart:html';
+import 'dart:async';
+import 'package:observatory/models.dart' as M show IsolateRef, ClassRef;
+import 'package:observatory/src/elements/helpers/tag.dart';
+import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
+import 'package:observatory/src/elements/nav/menu.dart';
+
+class NavClassMenuElement extends HtmlElement implements Renderable {
+  static const tag = const Tag<NavClassMenuElement>('nav-class-menu',
+                     dependencies: const [NavMenuElement.tag]);
+
+  RenderingScheduler _r;
+
+  Stream<RenderedEvent<NavClassMenuElement>> get onRendered => _r.onRendered;
+
+  bool _last;
+  M.IsolateRef _isolate;
+  M.ClassRef _cls;
+  bool get last => _last;
+  M.IsolateRef get isolate => _isolate;
+  M.ClassRef get cls => _cls;
+  set last(bool value) {
+    if (_last != value) {
+      _last = value;
+      _r.dirty();
+    } else {
+      _r.scheduleNotification();
+    }
+  }
+
+  factory NavClassMenuElement(M.IsolateRef isolate, M.ClassRef cls,
+                                {bool last: false, RenderingQueue queue}) {
+    assert(isolate != null);
+    assert(cls != null);
+    assert(last != null);
+    NavClassMenuElement e = document.createElement(tag.name);
+    e._r = new RenderingScheduler(e, queue: queue);
+    e._isolate = isolate;
+    e._cls = cls;
+    e._last = last;
+    return e;
+  }
+
+  NavClassMenuElement.created() : super.created() { createShadowRoot(); }
+
+  @override
+  void attached() { super.attached(); _r.enable(); }
+
+  @override
+  void detached() {
+    super.detached(); _r.disable(notify: true);
+    shadowRoot.children = [];
+  }
+
+  void render() {
+    shadowRoot.children = [
+      new NavMenuElement(cls.name, last: last, queue: _r.queue,
+                link: '/inspect?isolateId=${Uri.encodeComponent(isolate.id)}'
+                               '&objectId=${Uri.encodeComponent(cls.id)}')
+        ..children = [new ContentElement()]
+    ];
+  }
+}