1 files changed, 75 insertions, 0 deletions
diff --git a/layout/xul/ContainerBoxObject.cpp b/layout/xul/ContainerBoxObject.cpp
new file mode 100644
index 000000000..0464a6fec
--- /dev/null
+++ b/layout/xul/ContainerBoxObject.cpp
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/dom/ContainerBoxObject.h"
+#include "mozilla/dom/ContainerBoxObjectBinding.h"
+#include "nsCOMPtr.h"
+#include "nsIDocShell.h"
+#include "nsIContent.h"
+#include "nsIDocument.h"
+#include "nsIFrame.h"
+#include "nsSubDocumentFrame.h"
+
+namespace mozilla {
+namespace dom {
+  
+ContainerBoxObject::ContainerBoxObject()
+{
+}
+
+ContainerBoxObject::~ContainerBoxObject()
+{
+}
+
+JSObject*
+ContainerBoxObject::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+{
+  return ContainerBoxObjectBinding::Wrap(aCx, this, aGivenProto);
+}
+
+already_AddRefed<nsIDocShell>
+ContainerBoxObject::GetDocShell()
+{
+  nsSubDocumentFrame *subDocFrame = do_QueryFrame(GetFrame(false));
+  if (subDocFrame) {
+    // Ok, the frame for mContent is an nsSubDocumentFrame, it knows how
+    // to reach the docshell, so ask it...
+    nsCOMPtr<nsIDocShell> ret;
+    subDocFrame->GetDocShell(getter_AddRefs(ret));
+    return ret.forget();
+  }
+
+  if (!mContent) {
+    return nullptr;
+  }
+
+  // No nsSubDocumentFrame available for mContent, try if there's a mapping
+  // between mContent's document to mContent's subdocument.
+
+  nsIDocument *doc = mContent->GetComposedDoc();
+
+  if (!doc) {
+    return nullptr;
+  }
+
+  nsIDocument *sub_doc = doc->GetSubDocumentFor(mContent);
+
+  if (!sub_doc) {
+    return nullptr;
+  }
+
+  nsCOMPtr<nsIDocShell> result = sub_doc->GetDocShell();
+  return result.forget();
+}
+
+} // namespace dom
+} // namespace mozilla
+
+nsresult
+NS_NewContainerBoxObject(nsIBoxObject** aResult)
+{
+  NS_ADDREF(*aResult = new mozilla::dom::ContainerBoxObject());
+  return NS_OK;
+}