Wrapping leaf nodes in non polymer elements

runtime/observatory/lib/src/elements/source_link.dart

+// Copyright (c) 2013, 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.
+
+library source_link_element;
+
+import 'dart:html';
+import 'dart:async';
+import 'package:observatory/models.dart'
+  show IsolateRef, SourceLocation, Script, ScriptRepository;
+import 'package:observatory/src/elements/helpers/tag.dart';
+import 'package:observatory/src/elements/helpers/rendering_scheduler.dart';
+
+class SourceLinkElement extends HtmlElement implements Renderable{
+  static const tag = const Tag<SourceLinkElement>('source-link-wrapped');
+
+  RenderingScheduler _r;
+
+  Stream<RenderedEvent<SourceLinkElement>> get onRendered => _r.onRendered;
+
+
+  IsolateRef _isolate;
+  SourceLocation _location;
+  Script _script;
+  ScriptRepository _repository;
+
+  IsolateRef get isolate => _isolate;
+  SourceLocation get location => _location;
+
+  factory SourceLinkElement(IsolateRef isolate, SourceLocation location,
+                        ScriptRepository repository, {RenderingQueue queue}) {
+    assert(isolate != null);
+    assert(location != null);
+    SourceLinkElement e = document.createElement(tag.name);
+    e._r = new RenderingScheduler(e, queue: queue);
+    e._isolate = isolate;
+    e._location = location;
+    e._repository = repository;
+    return e;
+  }
+
+  SourceLinkElement.created() : super.created();
+
+  @override
+  void attached() {
+    super.attached();
+    assert(location != null);
+    _r.enable();
+    _repository.get(_location.script.id).then((script) {
+      _script = script;
+      _r.dirty();
+    });
+  }
+
+  @override
+  void detached() { super.detached(); children = []; _r.disable(notify: true); }
+
+  Future render() async {
+    if (_script == null) {
+      children = [new SpanElement()..text = '<LOADING>'];
+    } else {
+      String label = _script.uri.split('/').last;
+      int token = _location.tokenPos;
+      int line = _script.tokenToLine(token);
+      int column = _script.tokenToCol(token);
+      children = [
+        new AnchorElement(href: '#/inspect?'
+                        'isolateId=${Uri.encodeComponent(isolate.id)}&'
+                        'objectId=${Uri.encodeComponent(_script.id)}'
+                        '---pos=${token}')
+          ..title = _script.uri
+          ..text = '${label}:${line}:${column}'
+      ];
+    }
+  }
+}