Centralized event streams

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';
 
 @bindable
 class NavNotifyElementWrapper extends HtmlElement {
   static const binder = const Binder<NavNotifyElementWrapper>(const {
       'notifications': #notifications, 'notifyOnPause': #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 value) {
-    _notifications = value; render();
+    _notifications = value;
+    render();
   }
   set notifyOnPause(bool value) {
-    _notifyOnPause = value; render();
+    _notifyOnPause = value;
+    render();
   }
 
   NavNotifyElementWrapper.created() : super.created() {
     binder.registerCallback(this);
     createShadowRoot();
     render();
   }
 
   @override
   void attached() {
     super.attached();
     render();
   }
 
   void render() {
     shadowRoot.children = [];
-    if (_notifications == null) return;
+    if (_notifications == null) {
+      return;
+    }
 
     shadowRoot.children = [
       new StyleElement()
         ..text = '''nav-notify-wrapped > div {
           float: right;
         }
         nav-notify-wrapped > div > div {
           display: block;
           position: absolute;
           top: 98%;
@@ skipping 59 matching lines @@
         }
 
         nav-exception > div > button:hover, nav-event > div > button:hover {
           background: rgba(255,255,255,0.5);
         }''',
       new NavNotifyElement(_notifications, notifyOnPause: notifyOnPause,
                                  queue: ObservatoryApplication.app.queue)
     ];
   }
 }