Implement CloneState() for nsXFormsContextContainer to clone the model, node, context position, and context size. Merge from XFORMS_20050106_BRANCH.

extensions/xforms/nsXFormsContextContainer.cpp

@@ -86,6 +86,7 @@ public:
 
   // nsIXTFElement overrides
   NS_IMETHOD OnDestroyed();
+  NS_IMETHOD CloneState(nsIDOMElement *aElement);
 
   // nsIXFormsControl
   NS_IMETHOD Refresh();
@@ -165,6 +166,22 @@ nsXFormsContextContainer::OnDestroyed()
   return nsXFormsControlStub::OnDestroyed();
 }
 
+NS_IMETHODIMP
+nsXFormsContextContainer::CloneState(nsIDOMElement *aElement)
+{
+  nsCOMPtr<nsIXFormsContextControl> other = do_QueryInterface(aElement);
+  if (!other) {
+    NS_WARNING("CloneState called with a different type source node");
+    return NS_ERROR_FAILURE;
+  }
+
+  nsAutoString modelID;
+  PRInt32 position, size;
+  other->GetContext(modelID, getter_AddRefs(mContextNode), &position, &size);
+
+  return NS_OK;
+}
+
 // nsIXFormsContextControl
 NS_IMETHODIMP
 nsXFormsContextContainer::SetContextNode(nsIDOMNode *aContextNode)