Converted Observatory isolate-nav-menu element

runtime/observatory/lib/src/elements/nav/isolate_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 'dart:async';
+
+import 'package:observatory/app.dart';
+import 'package:observatory/service.dart';
+import 'package:observatory/mocks.dart';
+import 'package:observatory/models.dart' as M;
+import 'package:observatory/src/elements/helpers/tag.dart';
+import 'package:observatory/src/elements/shims/binding.dart';
+import 'package:observatory/src/elements/nav/isolate_menu.dart';
+
+class NavIsolateMenuElementWrapper extends HtmlElement {
+  static final binder = new Binder<NavIsolateMenuElementWrapper>(
+    const [const Binding('last'), const Binding('isolate')]);
+
+  static const tag =
+    const Tag<NavIsolateMenuElementWrapper>('isolate-nav-menu');
+
+  final StreamController<M.IsolateUpdateEvent> _updatesController =
+    new StreamController<M.IsolateUpdateEvent>();
+  Stream<M.IsolateUpdateEvent> _updates;
+  StreamSubscription _subscription;
+
+  bool _last = false;
+  Isolate _isolate;
+  bool get last => _last;
+  Isolate get isolate => _isolate;
+  set last(bool value) {
+    _last = value; render();
+  }
+  set isolate(Isolate value) {
+    _isolate = value;  _detached(); _attached();
+  }
+
+  NavIsolateMenuElementWrapper.created() : super.created() {
+    _updates = _updatesController.stream.asBroadcastStream();
+    binder.registerCallback(this);
+    _last = _getBoolAttribute('last');
+    createShadowRoot();
+    render();
+  }
+
+  @override
+  void attached() {
+    super.attached();
+    _attached();
+  }
+
+  @override
+  void detached() {
+    super.detached();
+    _detached();
+  }
+
+  void _attached() {
+    if (_isolate != null) {
+      _subscription = _isolate.changes.listen((_) {
+        _updatesController.add(new IsolateUpdateEventMock(isolate: isolate));
+      });
+    }
+    render();
+  }
+
+  void _detached() {
+    if (_subscription != null) {
+      _subscription.cancel();
+      _subscription = null;
+    }
+  }
+
+  void render() {
+    shadowRoot.children = [];
+    if (_isolate == null || _last == null) return;
+
+    shadowRoot.children = [
+      new NavIsolateMenuElement(isolate, _updates, last: last,
+                                 queue: ObservatoryApplication.app.queue)
+        ..children = [new ContentElement()]
+    ];
+  }
+
+  bool _getBoolAttribute(String name) {
+    final String value = getAttribute(name);
+    return !(value == null || value == 'false');
+  }
+}