Converted Observatory class-nav-menu element

runtime/observatory/lib/src/elements/nav/class_menu_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/service.dart';
 import 'package:observatory/src/elements/helpers/tag.dart';
 import 'package:observatory/src/elements/shims/binding.dart';
-import 'package:observatory/src/elements/nav/menu.dart';
+import 'package:observatory/src/elements/nav/class_menu.dart';
 
-class NavMenuElementWrapper extends HtmlElement {
-  static final binder = new Binder<NavMenuElementWrapper>(
-    const [const Binding('anchor'), const Binding('link'),
-           const Binding('last')]);
+class NavClassMenuElementWrapper extends HtmlElement {
+  static final binder = new Binder<NavClassMenuElementWrapper>(
+    const [const Binding('last'), const Binding('cls')]);
 
   static const tag =
-    const Tag<NavMenuElementWrapper>('nav-menu');
+    const Tag<NavClassMenuElementWrapper>('class-nav-menu');
 
-  String _anchor = '---';
-  String _link;
   bool _last = false;
-  String get anchor => _anchor;
-  String get link => _link;
+  Class _cls;
   bool get last => _last;
-  set anchor(String value) {
-    _anchor = value; render();
-  }
-  set link(String value) {
-    _link = value; render();
-  }
+  Class get cls => _cls;
   set last(bool value) {
     _last = value; render();
   }
+  set cls(Class value) {
+    _cls = value; render();
+  }
 
-  NavMenuElementWrapper.created() : super.created() {
+  NavClassMenuElementWrapper.created() : super.created() {
     binder.registerCallback(this);
-    _anchor = getAttribute('anchor');
-    _link = getAttribute('link');
-    _last = getAttribute('') != null;
+    _last = !isNullOrFalse(getAttribute('last'));
     createShadowRoot();
     render();
   }
 
   @override
   void attached() {
     super.attached();
     render();
   }
 
   void render() {
     shadowRoot.children = [];
-    if (_anchor == null || _last == null) return;
+    if (_cls == null || _last == null) return;
 
     shadowRoot.children = [
-      new NavMenuElement(_anchor, link: _link, last: last,
+      new NavClassMenuElement(cls.isolate, cls, last: last,
                                  queue: ObservatoryApplication.app.queue)
         ..children = [new ContentElement()]
     ];
   }
+
+  static bool isNullOrFalse(String value) {
+    return value == null || value == 'false';
+  }
 }