gecko/layout/mathml/nsMathMLmsqrtFrame.cpp

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/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
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 * 1.1 (the "License"); you may not use this file except in compliance with
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 * 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>
 *   Vilya Harvey <vilya@nag.co.uk>
 *   Shyjan Mahamud <mahamud@cs.cmu.edu>
 *   Karl Tomlinson <karlt+@karlt.net>, Mozilla Corporation
 *
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#include "nsMathMLmsqrtFrame.h"

//
// <msqrt> -- form a radical - implementation
//

//NOTE:
//  The code assumes that TeX fonts are picked.
//  There is no fall-back to draw the branches of the sqrt explicitly
//  in the case where TeX fonts are not there. In general, there are no
//  fall-back(s) in MathML when some (freely-downloadable) fonts are missing.
//  Otherwise, this will add much work and unnecessary complexity to the core
//  MathML  engine. Assuming that authors have the free fonts is part of the
//  deal. We are not responsible for cases of misconfigurations out there.

nsIFrame*
NS_NewMathMLmsqrtFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
  return new (aPresShell) nsMathMLmsqrtFrame(aContext);
}

NS_IMPL_FRAMEARENA_HELPERS(nsMathMLmsqrtFrame)

nsMathMLmsqrtFrame::nsMathMLmsqrtFrame(nsStyleContext* aContext) :
  nsMathMLmencloseFrame(aContext)
{
}

nsMathMLmsqrtFrame::~nsMathMLmsqrtFrame()
{
}

NS_IMETHODIMP
nsMathMLmsqrtFrame::Init(nsIContent*      aContent,
                         nsIFrame*        aParent,
                         nsIFrame*        aPrevInFlow)
{
  nsresult rv = nsMathMLContainerFrame::Init(aContent, aParent, aPrevInFlow);
  AllocateMathMLChar(NOTATION_RADICAL);
  mNotationsToDraw |= NOTATION_RADICAL;

  return rv;
}

NS_IMETHODIMP
nsMathMLmsqrtFrame::InheritAutomaticData(nsIFrame* aParent)
{
  nsMathMLContainerFrame::InheritAutomaticData(aParent);

  mPresentationData.flags |= NS_MATHML_STRETCH_ALL_CHILDREN_VERTICALLY;

  return NS_OK;
}

NS_IMETHODIMP
nsMathMLmsqrtFrame::AttributeChanged(PRInt32         aNameSpaceID,
                                     nsIAtom*        aAttribute,
                                     PRInt32         aModType)
{
  return nsMathMLContainerFrame::
    AttributeChanged(aNameSpaceID, aAttribute, aModType);
}