nsMathMLmrowFrame.h

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/* -*- 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"

namespace mozilla {

class PresShell;

}  // namespace mozilla

//

// <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(mozilla::PresShell* aPresShell,

                                         ComputedStyle* aStyle);

  nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,

                            int32_t aModType) override;

  NS_IMETHOD

  InheritAutomaticData(nsIFrame* aParent) override;

  NS_IMETHOD

  TransmitAutomaticData() override {

    return TransmitAutomaticDataForMrowLikeElement();

  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, nsPresContext* aPresContext)

      : nsMathMLContainerFrame(aStyle, aPresContext, kClassID) {}

  virtual ~nsMathMLmrowFrame();

};

#endif /* nsMathMLmrowFrame_h___ */