Converted Observatory vm-nav-menu element

runtime/observatory/lib/src/elements/nav/vm_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 VM, IsolateRef, Target, VMUpdateEvent;
+import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
+import 'package:observatory/src/elements/helpers/tag.dart';
+import 'package:observatory/src/elements/helpers/uris.dart';
+import 'package:observatory/src/elements/nav/menu.dart';
+import 'package:observatory/src/elements/nav/menu_item.dart';
+
+class NavVMMenuElement extends HtmlElement implements Renderable {
+  static const tag = const Tag<NavVMMenuElement>('nav-vm-menu',
+                     dependencies: const [NavMenuElement.tag,
+                                          NavMenuItemElement.tag]);
+
+  RenderingScheduler _r;
+
+  Stream<RenderedEvent<NavVMMenuElement>> get onRendered => _r.onRendered;
+
+  Stream<M.VMUpdateEvent> _updates;
+  StreamSubscription _updatesSubscription;
+
+  bool _last;
+  M.VM _vm;
+  M.Target _target;
+  bool get last => _last;
+  M.VM get vm => _vm;
+  M.Target get target => _target;
+  set last(bool value) => _last = _r.checkAndReact(_last, value);
+
+  factory NavVMMenuElement(M.VM vm, Stream<M.VMUpdateEvent> updates,
+      {bool last: false, M.Target target, RenderingQueue queue}) {
+    assert(vm != null);
+    assert(updates != null);
+    assert(last != null);
+    NavVMMenuElement e = document.createElement(tag.name);
+    e._r = new RenderingScheduler(e, queue: queue);
+    e._vm = vm;
+    e._updates = updates;
+    e._last = last;
+    e._target = target;
+    return e;
+  }
+
+  NavVMMenuElement.created() : super.created() { createShadowRoot(); }
+
+  @override
+  void attached() {
+    super.attached();
+    _r.enable();
+    _updatesSubscription = _updates
+      .listen((M.VMUpdateEvent e) { _vm = e.vm; _r.dirty(); });
+  }
+
+  @override
+  void detached() {
+    super.detached();
+    _r.disable(notify: true);
+    shadowRoot.children = [];
+    assert(_updatesSubscription != null);
+    _updatesSubscription.cancel();
+    _updatesSubscription = null;
+  }
+
+  void render() {
+    final String name = (target == null) ? vm.name
+                                         : '${vm.name}@${target.name}';
+    /// TODO(cbernaschina) use the isolate repository.
+    shadowRoot.children = [
+      new NavMenuElement(name, link: Uris.vm(), last: last, queue: _r.queue)
+        ..children = (
+          _vm.isolates.map((M.IsolateRef isolate) {
+            return new NavMenuItemElement(isolate.name, queue: _r.queue,
+                link: Uris.inspect(isolate));
+          }).toList()
+          ..add(new ContentElement())
+        )
+    ];
+  }
+}