Adding .toggle method to Element.classes to match the JS element.classList.toggle method.

lib/dom/templates/html/interface/interface_Element.darttemplate

Index: lib/dom/templates/html/interface/interface_Element.darttemplate
diff --git a/lib/dom/templates/html/interface/interface_Element.darttemplate b/lib/dom/templates/html/interface/interface_Element.darttemplate
index 455eb0d24f804990c5402ad2773a97dca3bd0125..7023a62034452a63c0ea4c3a712ddab662a75587 100644
--- a/lib/dom/templates/html/interface/interface_Element.darttemplate
+++ b/lib/dom/templates/html/interface/interface_Element.darttemplate
@@ -47,6 +47,14 @@ interface NodeSelector {
   List<Element> queryAll(String selectors);
 }
 
+interface CSSClassSet extends Set<String> {
+  /// Adds the class to the element if it is not on it, removes it if it is.

[sra1, 2012/08/24 20:31:02]

Adds the class [token] ...

[blois, 2012/08/24 21:39:47]

Done.

+  bool toggle(String token);
+
+  /// True if this classes cannot be added or removed from this.

[sra1, 2012/08/24 20:31:02]

Not sure what this this or that this means.

Maybe
/// Returns [:true:] classes cannot be added or removed from this
[:CSSClassSet:]

[blois, 2012/08/24 21:39:47]

Done.

+  bool isFrozen();

[sra1, 2012/08/24 20:31:02]

Should this be a property?  I would hope that this will ever be an expensive or
side-effecting operation :-)

[blois, 2012/08/24 21:39:47]

Done.

[blois, 2012/08/24 21:39:47]

Done.

+}
+
 $!COMMENT
 interface Element extends Node, NodeSelector default _$(ID)FactoryProvider {
   Element.html(String html);
@@ -64,7 +72,7 @@ interface Element extends Node, NodeSelector default _$(ID)FactoryProvider {
   void set elements(Collection<Element> value);
 
   /** @domName className, classList */
-  Set<String> get classes();
+  CSSClassSet get classes();
 
   void set classes(Collection<String> value);