Display function signatures instead of just "Function".

client/lib/components/closure.dart

Index: client/lib/components/closure.dart
diff --git a/client/lib/components/closure.dart b/client/lib/components/closure.dart
new file mode 100644
index 0000000000000000000000000000000000000000..3e75d933132e55989e33623438a1fada60bb2018
--- /dev/null
+++ b/client/lib/components/closure.dart
@@ -0,0 +1,46 @@
+// 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.parameters;
+
+import 'dart:html';
+
+import 'package:polymer/polymer.dart';
+
+import 'package:dartdoc_viewer/item.dart';
+
+import 'type.dart';
+import 'parameters.dart';
+
+/**
+ * An element representing a function that is passed in as a parameter to a
+ * method.
+ */
+@CustomTag("dartdoc-closure")
+class ClosureElement extends PolymerElement {
+  @observable Closure closure;
+
+  factory ClosureElement() => new Element.tag('dartdoc-closure');
+  ClosureElement.created() : super.created();
+
+  void closureChanged() {
+    this.children.clear();
+
+    var outerSpan = new SpanElement();
+    if (!closure.returnType.isDynamic) {
+      outerSpan.append(new TypeElement()..type = closure.returnType);
+      outerSpan.appendText(' ');
+    }
+
+    var parameterName = new AnchorElement()
+              ..text = closure.name
+              ..href = closure.prefixedAnchorHref
+              ..id = closure.anchorHrefLocation.anchor;
+
+    outerSpan.append(parameterName);
+    outerSpan.append(new ParameterElement()
+      ..parameters = closure.parameters);
+    this.append(outerSpan);
+  }
+}