gecko/layout/mathml/nsMathMLmsqrtFrame.h

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 * 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/
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 * 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>
 *   Vilya Harvey <vilya@nag.co.uk>
 *   Shyjan Mahamud <mahamud@cs.cmu.edu>
 *
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 * 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"),
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 * ***** END LICENSE BLOCK ***** */

#ifndef nsMathMLmsqrtFrame_h___
#define nsMathMLmsqrtFrame_h___

#include "nsMathMLmencloseFrame.h"

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

/*
The MathML REC describes:

The <msqrt> element is used to display square roots.
The syntax for <msqrt> is:
  <msqrt> base </msqrt>

Attributes of <msqrt> and <mroot>:

None (except the attributes allowed for all MathML elements, listed in Section
2.3.4). 

The <mroot> element increments scriptlevel by 2, and sets displaystyle to
"false", within index, but leaves both attributes unchanged within base. The
<msqrt> element leaves both attributes unchanged within all its arguments.
These attributes are inherited by every element from its rendering environment,
but can be set explicitly only on <mstyle>. (See Section 3.3.4.) 
*/

class nsMathMLmsqrtFrame : public nsMathMLmencloseFrame {
public:
  NS_DECL_FRAMEARENA_HELPERS

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

  NS_IMETHOD
  Init(nsIContent* aContent,
       nsIFrame*   aParent,
       nsIFrame*   aPrevInFlow);

  NS_IMETHOD
  AttributeChanged(PRInt32         aNameSpaceID,
                   nsIAtom*        aAttribute,
                   PRInt32         aModType);

protected:
  nsMathMLmsqrtFrame(nsStyleContext* aContext);
  virtual ~nsMathMLmsqrtFrame();
};

#endif /* nsMathMLmsqrtFrame_h___ */