diff -r 000000000000 -r 6474c204b198 layout/mathml/nsMathMLmoFrame.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/mathml/nsMathMLmoFrame.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,102 @@
+/* -*- 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/. */
+
+#ifndef nsMathMLmoFrame_h___
+#define nsMathMLmoFrame_h___
+
+#include "mozilla/Attributes.h"
+#include "nsMathMLTokenFrame.h"
+#include "nsMathMLChar.h"
+
+//
+// <mo> -- operator, fence, or separator
+//
+
+class nsMathMLmoFrame : public nsMathMLTokenFrame {
+public:
+  NS_DECL_FRAMEARENA_HELPERS
+
+  friend nsIFrame* NS_NewMathMLmoFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
+
+  virtual eMathMLFrameType GetMathMLFrameType() MOZ_OVERRIDE;
+
+  virtual void
+  SetAdditionalStyleContext(int32_t          aIndex, 
+                            nsStyleContext*  aStyleContext) MOZ_OVERRIDE;
+  virtual nsStyleContext*
+  GetAdditionalStyleContext(int32_t aIndex) const MOZ_OVERRIDE;
+
+  virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,
+                                const nsRect&           aDirtyRect,
+                                const nsDisplayListSet& aLists) MOZ_OVERRIDE;
+
+  NS_IMETHOD
+  InheritAutomaticData(nsIFrame* aParent) MOZ_OVERRIDE;
+
+  NS_IMETHOD
+  TransmitAutomaticData() MOZ_OVERRIDE;
+
+  virtual nsresult
+  SetInitialChildList(ChildListID     aListID,
+                      nsFrameList&    aChildList) MOZ_OVERRIDE;
+
+  virtual nsresult
+  Reflow(nsPresContext*          aPresContext,
+         nsHTMLReflowMetrics&     aDesiredSize,
+         const nsHTMLReflowState& aReflowState,
+         nsReflowStatus&          aStatus) MOZ_OVERRIDE;
+
+  virtual void MarkIntrinsicWidthsDirty() MOZ_OVERRIDE;
+
+  virtual void
+  GetIntrinsicWidthMetrics(nsRenderingContext* aRenderingContext,
+                           nsHTMLReflowMetrics& aDesiredSize) MOZ_OVERRIDE;
+
+  virtual nsresult
+  AttributeChanged(int32_t         aNameSpaceID,
+                   nsIAtom*        aAttribute,
+                   int32_t         aModType) MOZ_OVERRIDE;
+
+  // This method is called by the parent frame to ask <mo> 
+  // to stretch itself.
+  NS_IMETHOD
+  Stretch(nsRenderingContext& aRenderingContext,
+          nsStretchDirection   aStretchDirection,
+          nsBoundingMetrics&   aContainerSize,
+          nsHTMLReflowMetrics& aDesiredStretchSize) MOZ_OVERRIDE;
+
+  virtual nsresult
+  ChildListChanged(int32_t aModType) MOZ_OVERRIDE
+  {
+    ProcessTextData();
+    return nsMathMLContainerFrame::ChildListChanged(aModType);
+  }
+
+protected:
+  nsMathMLmoFrame(nsStyleContext* aContext) : nsMathMLTokenFrame(aContext) {}
+  virtual ~nsMathMLmoFrame();
+  
+  nsMathMLChar     mMathMLChar; // Here is the MathMLChar that will deal with the operator.
+  nsOperatorFlags  mFlags;
+  float            mMinSize;
+  float            mMaxSize;
+
+  bool UseMathMLChar();
+
+  // overload the base method so that we can setup our nsMathMLChar
+  void ProcessTextData();
+
+  // helper to get our 'form' and lookup in the Operator Dictionary to fetch 
+  // our default data that may come from there, and to complete the setup
+  // using attributes that we may have
+  void
+  ProcessOperatorData();
+
+  // helper to double check thar our char should be rendered as a selected char
+  bool
+  IsFrameInSelection(nsIFrame* aFrame);
+};
+
+#endif /* nsMathMLmoFrame_h___ */