diff -r 000000000000 -r 6474c204b198 layout/xul/nsDeckFrame.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/xul/nsDeckFrame.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,74 @@
+/* -*- 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/. */
+
+/**
+
+  Eric D Vaughan
+  A frame that can have multiple children. Only one child may be displayed at one time. So the
+  can be flipped though like a deck of cards.
+ 
+**/
+
+#ifndef nsDeckFrame_h___
+#define nsDeckFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsBoxFrame.h"
+
+class nsDeckFrame : public nsBoxFrame
+{
+public:
+  NS_DECL_QUERYFRAME_TARGET(nsDeckFrame)
+  NS_DECL_QUERYFRAME
+  NS_DECL_FRAMEARENA_HELPERS
+
+  friend nsIFrame* NS_NewDeckFrame(nsIPresShell* aPresShell,
+                                   nsStyleContext* aContext);
+
+  virtual nsresult AttributeChanged(int32_t         aNameSpaceID,
+                                    nsIAtom*        aAttribute,
+                                    int32_t         aModType) MOZ_OVERRIDE;
+
+  NS_IMETHOD DoLayout(nsBoxLayoutState& aState) MOZ_OVERRIDE;
+
+  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                                const nsRect&           aDirtyRect,
+                                const nsDisplayListSet& aLists) MOZ_OVERRIDE;
+
+  virtual void BuildDisplayListForChildren(nsDisplayListBuilder*   aBuilder,
+                                           const nsRect&           aDirtyRect,
+                                           const nsDisplayListSet& aLists) MOZ_OVERRIDE;
+                                         
+  virtual void Init(nsIContent*      aContent,
+                    nsIFrame*        aParent,
+                    nsIFrame*        aPrevInFlow) MOZ_OVERRIDE;
+
+  virtual nsIAtom* GetType() const MOZ_OVERRIDE;
+
+#ifdef DEBUG_FRAME_DUMP
+  virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE
+  {
+      return MakeFrameName(NS_LITERAL_STRING("Deck"), aResult);
+  }
+#endif
+
+  nsDeckFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+
+  nsIFrame* GetSelectedBox();
+
+protected:
+
+  void IndexChanged();
+  int32_t GetSelectedIndex();
+  void HideBox(nsIFrame* aBox);
+
+private:
+
+  int32_t mIndex;
+
+}; // class nsDeckFrame
+
+#endif
+