Converted Observatory class-tree element

runtime/observatory/lib/src/app/page.dart

 // Copyright (c) 2014, 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.
 
 part of app;
 
 class IsolateNotFound implements Exception {
   String isolateId;
   IsolateNotFound(this.isolateId);
   String toString() => "IsolateNotFound: $isolateId";
@@ skipping 144 matching lines @@
       serviceElement.object = obj;
     }
   }
 }
 
 
 /// Class tree page.
 class ClassTreePage extends SimplePage {
   ClassTreePage(app) : super('class-tree', 'class-tree', app);
 
+  final DivElement container = new DivElement();
+
+  @override
+  void onInstall() {
+    element = container;
+  }
+
   void _visit(Uri uri) {
     super._visit(uri);
     getIsolate(uri).then((isolate) {
-      if (element != null) {
-        /// Update the page.
-        ClassTreeElement page = element;
-        page.isolate = isolate;
-      }
+      container.children = [
+        new ClassTreeElement(app.vm,
+                             isolate,
+                             app.events,
+                             app.notifications,
+                             new ClassRepository(isolate))
+      ];
     });
   }
 }
 
 class DebuggerPage extends SimplePage {
   DebuggerPage(app) : super('debugger', 'debugger-page', app);
 
   void _visit(Uri uri) {
     super._visit(uri);
     getIsolate(uri).then((isolate) {
@@ skipping 282 matching lines @@
     assert(element != null);
   }
 
   void _visit(Uri uri) {
     assert(element != null);
     assert(canVisit(uri));
   }
 
   bool canVisit(Uri uri) => uri.path == 'timeline';
 }