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       1             : /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : 
       6             : #ifndef nsMathMLmsqrtFrame_h___
       7             : #define nsMathMLmsqrtFrame_h___
       8             : 
       9             : #include "mozilla/Attributes.h"
      10             : #include "nsMathMLmencloseFrame.h"
      11             : 
      12             : //
      13             : // <msqrt> -- form a radical
      14             : //
      15             : 
      16             : /*
      17             : The MathML REC describes:
      18             : 
      19             : The <msqrt> element is used to display square roots.
      20             : The syntax for <msqrt> is:
      21             :   <msqrt> base </msqrt>
      22             : 
      23             : Attributes of <msqrt> and <mroot>:
      24             : 
      25             : None (except the attributes allowed for all MathML elements, listed in Section
      26             : 2.3.4).
      27             : 
      28             : The <mroot> element increments scriptlevel by 2, and sets displaystyle to
      29             : "false", within index, but leaves both attributes unchanged within base. The
      30             : <msqrt> element leaves both attributes unchanged within all its arguments.
      31             : These attributes are inherited by every element from its rendering environment,
      32             : but can be set explicitly only on <mstyle>. (See Section 3.3.4.)
      33             : */
      34             : 
      35             : class nsMathMLmsqrtFrame : public nsMathMLmencloseFrame {
      36             : public:
      37           0 :   NS_DECL_FRAMEARENA_HELPERS(nsMathMLmsqrtFrame)
      38             : 
      39             :   friend nsIFrame* NS_NewMathMLmsqrtFrame(nsIPresShell*   aPresShell,
      40             :                                           nsStyleContext* aContext);
      41             : 
      42             :   virtual void
      43             :   Init(nsIContent*       aContent,
      44             :        nsContainerFrame* aParent,
      45             :        nsIFrame*         aPrevInFlow) override;
      46             : 
      47             :   NS_IMETHOD
      48             :   InheritAutomaticData(nsIFrame* aParent) override;
      49             : 
      50             :   virtual nsresult
      51             :   AttributeChanged(int32_t         aNameSpaceID,
      52             :                    nsIAtom*        aAttribute,
      53             :                    int32_t         aModType) override;
      54             : 
      55             :   virtual bool
      56           0 :   IsMrowLike() override
      57             :   {
      58           0 :     return mFrames.FirstChild() != mFrames.LastChild() ||
      59           0 :            !mFrames.FirstChild();
      60             :   }
      61             : 
      62             : protected:
      63             :   explicit nsMathMLmsqrtFrame(nsStyleContext* aContext);
      64             :   virtual ~nsMathMLmsqrtFrame();
      65             : };
      66             : 
      67             : #endif /* nsMathMLmsqrtFrame_h___ */
      68             :