gecko-dev/layout/mathml/nsMathMLmpaddedFrame.h

/* -*- 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 nsMathMLmpaddedFrame_h___
#define nsMathMLmpaddedFrame_h___

#include "nsCOMPtr.h"
#include "nsMathMLContainerFrame.h"

//
// <mpadded> -- adjust space around content  
//

class nsMathMLmpaddedFrame : public nsMathMLContainerFrame {
public:
  NS_DECL_FRAMEARENA_HELPERS

  friend nsIFrame* NS_NewMathMLmpaddedFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);

  NS_IMETHOD
  InheritAutomaticData(nsIFrame* aParent);

  NS_IMETHOD
  TransmitAutomaticData() {
    return TransmitAutomaticDataForMrowLikeElement();
  }

  NS_IMETHOD
  Reflow(nsPresContext*          aPresContext,
         nsHTMLReflowMetrics&     aDesiredSize,
         const nsHTMLReflowState& aReflowState,
         nsReflowStatus&          aStatus);
  
  virtual nsresult
  Place(nsRenderingContext& aRenderingContext,
        bool                 aPlaceOrigin,
        nsHTMLReflowMetrics& aDesiredSize);

protected:
  nsMathMLmpaddedFrame(nsStyleContext* aContext) : nsMathMLContainerFrame(aContext) {}
  virtual ~nsMathMLmpaddedFrame();
  
  virtual int GetSkipSides() const { return 0; }

private:
  nsCSSValue mWidth;
  nsCSSValue mHeight;
  nsCSSValue mDepth;
  nsCSSValue mLeadingSpace;
  nsCSSValue mVerticalOffset;

  PRInt32    mWidthSign;
  PRInt32    mHeightSign;
  PRInt32    mDepthSign;
  PRInt32    mLeadingSpaceSign;
  PRInt32    mVerticalOffsetSign;

  PRInt32    mWidthPseudoUnit;
  PRInt32    mHeightPseudoUnit;
  PRInt32    mDepthPseudoUnit;
  PRInt32    mLeadingSpacePseudoUnit;
  PRInt32    mVerticalOffsetPseudoUnit;

  // helpers to process the attributes
  void
  ProcessAttributes();

  static bool
  ParseAttribute(nsString&   aString,
                 PRInt32&    aSign,
                 nsCSSValue& aCSSValue,
                 PRInt32&    aPseudoUnit);

  void
  UpdateValue(PRInt32                  aSign,
              PRInt32                  aPseudoUnit,
              const nsCSSValue&        aCSSValue,
              const nsBoundingMetrics& aBoundingMetrics,
              nscoord&                 aValueToUpdate) const;
};

#endif /* nsMathMLmpaddedFrame_h___ */