Wrapping leaf nodes in non polymer elements

runtime/observatory/lib/src/elements/nav/notify_wrapper.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 'package:observatory/app.dart';
+import 'package:observatory/repositories.dart';
+import 'package:observatory/src/elements/helpers/tag.dart';
+import 'package:observatory/src/elements/shims/binding.dart';
+import 'package:observatory/src/elements/nav/notify.dart';
+
+class NavNotifyElementWrapper extends HtmlElement {
+  static final binder = new Binder<NavNotifyElementWrapper>(
+    const [const Binding('notifications'), const Binding('notifyOnPause')]);
+
+  static const tag = const Tag<NavNotifyElementWrapper>('nav-notify');
+
+  NotificationRepository _notifications;
+  bool _notifyOnPause = true;
+  NotificationRepository get notifications => _notifications;
+  bool get notifyOnPause => _notifyOnPause;
+  set notifications(NotificationRepository notifications) {
+    _notifications = notifications; render();
+  }
+  set notifyOnPause(bool notifyOnPause) {
+    _notifyOnPause = notifyOnPause; render();
+  }
+
+  NavNotifyElementWrapper.created() : super.created() {
+    binder.registerCallback(this);
+    createShadowRoot();
+    render();
+  }
+
+  @override
+  void attached() {
+    super.attached();
+    render();
+  }
+
+  void render() {
+    shadowRoot.children = [];
+    if (_notifications == null) return;
+
+    shadowRoot.children = [
+      new StyleElement()
+        ..text = '@import "packages/observatory/src/elements/css/shared.css";',
+      new NavNotifyElement(_notifications, notifyOnPause: notifyOnPause,
+                                 queue: ObservatoryApplication.app.queue)
+    ];
+  }
+}