gecko/layout/mathml/nsMathMLmpaddedFrame.h

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla MathML Project.
 *
 * The Initial Developer of the Original Code is
 * The University Of Queensland.
 * Portions created by the Initial Developer are Copyright (C) 1999
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Roger B. Sidje <rbs@maths.uq.edu.au>
 *   David J. Fiddes <D.J.Fiddes@hw.ac.uk>
 *   Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either of the GNU General Public License Version 2 or later (the "GPL"),
 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
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 * use your version of this file under the terms of the MPL, indicate your
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 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#ifndef nsMathMLmpaddedFrame_h___
#define nsMathMLmpaddedFrame_h___

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

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

class nsMathMLmpaddedFrame : public nsMathMLContainerFrame {
public:
  friend nsIFrame* NS_NewMathMLmpaddedFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);

  NS_IMETHOD
  InheritAutomaticData(nsIFrame* aParent);

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

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

private:
  nsCSSValue mWidth;
  nsCSSValue mHeight;
  nsCSSValue mDepth;
  nsCSSValue mLeftSpace;

  PRInt32    mWidthSign;
  PRInt32    mHeightSign;
  PRInt32    mDepthSign;
  PRInt32    mLeftSpaceSign;

  PRInt32    mWidthPseudoUnit;
  PRInt32    mHeightPseudoUnit;
  PRInt32    mDepthPseudoUnit;
  PRInt32    mLeftSpacePseudoUnit;

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

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

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

#endif /* nsMathMLmpaddedFrame_h___ */