Centralized event streams

runtime/observatory/lib/src/elements/error_ref_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/mocks.dart' show ErrorRefMock;
-import 'package:observatory/service_html.dart' show ServiceMap, DartError;
+import 'package:observatory/service.dart';
 import 'package:observatory/src/elements/error_ref.dart';
 import 'package:observatory/src/elements/helpers/tag.dart';
 import 'package:observatory/src/elements/shims/binding.dart';
 
 class ErrorRefElementWrapper extends HtmlElement {
 
   static const binder = const Binder<ErrorRefElementWrapper>(const {
       'ref': #ref
     });
 
   static const tag = const Tag<ErrorRefElementWrapper>('error-ref');
 
-  ServiceMap _error;
-  ServiceMap get ref => _error;
-  void set ref(ServiceMap ref) { _error = ref; render(); }
+  DartError _error;
+
+  DartError get ref => _error;
+
+  void set ref(DartError value) {
+    _error = value;
+    render();
+  }
 
   ErrorRefElementWrapper.created() : super.created() {
     binder.registerCallback(this);
     createShadowRoot();
     render();
   }
 
   @override
   void attached() {
     super.attached();
     render();
   }
 
   void render() {
     shadowRoot.children = [];
-    if (_error == null) return;
+    if (_error == null) {
+      return;
+    }
 
-    if (ref is Map) {
-      shadowRoot.children = [
-        new StyleElement()
-          ..text = '''
-          error-ref-wrapped > pre {
-            background-color: #f5f5f5;
-            border: 1px solid #ccc;
-            padding: 10px;
-            font-family: consolas, courier, monospace;
-            font-size: 1em;
-            line-height: 1.2em;
-            white-space: pre;
-          }
-          ''',
-        new ErrorRefElement(new ErrorRefMock(message: ref['message']))
-      ];
-    } else {
-      shadowRoot.children = [
-        new StyleElement()
-          ..text = '''
-          error-ref-wrapped > pre {
-            background-color: #f5f5f5;
-            border: 1px solid #ccc;
-            padding: 10px;
-            font-family: consolas, courier, monospace;
-            font-size: 1em;
-            line-height: 1.2em;
-            white-space: pre;
-          }
-          ''',
-        new ErrorRefElement(
-                        new ErrorRefMock(message: (ref as DartError).message),
-                        queue: ObservatoryApplication.app.queue)
-      ];
-    }
+    shadowRoot.children = [
+      new StyleElement()
+        ..text = '''
+        error-ref-wrapped > pre {
+          background-color: #f5f5f5;
+          border: 1px solid #ccc;
+          padding: 10px;
+          font-family: consolas, courier, monospace;
+          font-size: 1em;
+          line-height: 1.2em;
+          white-space: pre;
+        }
+        ''',
+      new ErrorRefElement(_error, queue: ObservatoryApplication.app.queue)
+    ];
   }
 }