Display function signatures instead of just "Function".

client/lib/components/category.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 web.category;
 
 import 'package:polymer/polymer.dart';
 import 'package:dartdoc_viewer/item.dart';
 import 'package:dartdoc_viewer/app.dart';
 import 'package:dartdoc_viewer/member.dart';
 import 'dart:html';
 
 /**
  * An HTML representation of a Category.
  *
  * Used as a placeholder for an CategoryItem object.
  */
  @CustomTag("dartdoc-category")
 class CategoryElement extends DartdocElement {
   @published Category category;
 
   // Note: only one of these is used at any given time, the other two will be
   // null. We do it this way to keep the <template if> outside of the
   // <template repeat>, so the repeat is more strongly typed.
   @published ObservableList<Item> items;
+  @published ObservableList<Typedef> typedefs;
   @published ObservableList<Variable> variables;
   @published ObservableList<Method> methods;
 
   @observable bool hasItems = false;
 
   @observable String title;
   @observable String stylizedName;
 
   @observable String accordionStyle;
   @observable String divClass;
@@ skipping 20 matching lines @@
   }
 
   void categoryChanged() {
     title = category == null ? '' : category.name;
     stylizedName = category == null ? '' : category.name.replaceAll(' ', '-');
   }
 
   void itemsChanged() => _updateHasItems();
   void variablesChanged() => _updateHasItems();
   void methodsChanged() => _updateHasItems();
+  void typedefsChanged() => _updateHasItems();
 
   void _updateHasItems() {
     hasItems = items != null && items.isNotEmpty ||
         variables != null && variables.isNotEmpty ||
-        methods != null && methods.isNotEmpty;
+        methods != null && methods.isNotEmpty ||
+        typedefs != null && typedefs.isNotEmpty;
   }
 
   void hideShow(event, detail, AnchorElement target) {
     _isExpanded = !_isExpanded;
   }
 }