/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* 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 nsMathMLmrowFrame_h___

#define nsMathMLmrowFrame_h___

#include "mozilla/Attributes.h"

#include "nsMathMLContainerFrame.h"

//

// <mrow> -- horizontally group any number of subexpressions

// <mphantom> -- make content invisible but preserve its size

// <mstyle> -- make style changes that affect the rendering of its contents

//

class nsMathMLmrowFrame final : public nsMathMLContainerFrame

{

public:

  NS_DECL_FRAMEARENA_HELPERS(nsMathMLmrowFrame)

  friend nsIFrame* NS_NewMathMLmrowFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle);

  virtual nsresult

  AttributeChanged(int32_t  aNameSpaceID,

                   nsAtom* aAttribute,

                   int32_t  aModType) override;

  NS_IMETHOD

  InheritAutomaticData(nsIFrame* aParent) override;

  NS_IMETHOD

  TransmitAutomaticData() override {

    return TransmitAutomaticDataForMrowLikeElement();

  }

  virtual eMathMLFrameType

  GetMathMLFrameType() override;

  bool

  IsMrowLike() override {

    // <mrow> elements with a single child are treated identically to the case

    // where the child wasn't within an mrow, so we pretend the mrow isn't an

    // mrow in that situation.

    return mFrames.FirstChild() != mFrames.LastChild() ||

           !mFrames.FirstChild();

  }

protected:

  explicit nsMathMLmrowFrame(ComputedStyle* aStyle)

    : nsMathMLContainerFrame(aStyle, kClassID) {}

  virtual ~nsMathMLmrowFrame();

};

#endif /* nsMathMLmrowFrame_h___ */