Converted Observatory vm-connect element

runtime/observatory/lib/src/elements/vm_connect_target_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_html.dart';
-import 'package:observatory/src/elements/helpers/tag.dart';
-import 'package:observatory/src/elements/shims/binding.dart';
-import 'package:observatory/src/elements/vm_connect_target.dart';
-
-class VMConnectTargetElementWrapper extends HtmlElement {
-  static final binder = new Binder<VMConnectTargetElementWrapper>(
-    const [const Binding('target')]);
-
-  static const tag =
-    const Tag<VMConnectTargetElementWrapper>('vm-connect-target');
-
-  WebSocketVMTarget _target;
-  WebSocketVMTarget get target => _target;
-  void set target(WebSocketVMTarget target) { _target = target; render(); }
-
-  VMConnectTargetElementWrapper.created() : super.created() {
-    binder.registerCallback(this);
-    createShadowRoot();
-    render();
-  }
-
-  @override
-  void attached() {
-    super.attached();
-    render();
-  }
-
-  void render() {
-    if (target == null) return;
-
-    shadowRoot.children = [
-      new StyleElement()
-        ..text = '''
-        vm-connect-target-wrapped > button.delete-button {
-          margin-left: 0.28em;
-          padding: 4px;
-          background: transparent;
-          border: none !important;
-        }
-
-        vm-connect-target-wrapped > button.delete-button:hover {
-          background: #ff0000;
-        }''',
-      new VMConnectTargetElement(target, current: current,
-          queue: application.queue)
-        ..onConnect.listen(connectToVm)
-        ..onDelete.listen(deleteVm)
-    ];
-  }
-
-  static ObservatoryApplication get application => ObservatoryApplication.app;
-
-  bool get current {
-    if (application.vm == null) { return false; }
-    return (application.vm as WebSocketVM).target == target;
-  }
-
-  static void connectToVm(TargetEvent event) {
-    WebSocketVM currentVM = application.vm;
-    if ((currentVM == null) ||
-        currentVM.isDisconnected ||
-        (currentVM.target != event.target)) {
-      application.vm = new WebSocketVM(event.target);
-    }
-  }
-
-  static void deleteVm(TargetEvent event) {
-    application.targets.remove(event.target);
-  }
-}