nsMathMLmpaddedFrame.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 nsMathMLmpaddedFrame_h___

#define nsMathMLmpaddedFrame_h___

#include "mozilla/Attributes.h"

#include "nsCSSValue.h"

#include "nsMathMLContainerFrame.h"

namespace mozilla {

class PresShell;

}  // namespace mozilla

//

// <mpadded> -- adjust space around content

//

class nsMathMLmpaddedFrame final : public nsMathMLContainerFrame {

 public:

  NS_DECL_FRAMEARENA_HELPERS(nsMathMLmpaddedFrame)

  friend nsIFrame* NS_NewMathMLmpaddedFrame(mozilla::PresShell* aPresShell,

                                            ComputedStyle* aStyle);

  NS_IMETHOD

  InheritAutomaticData(nsIFrame* aParent) override;

  NS_IMETHOD

  TransmitAutomaticData() override {

    return TransmitAutomaticDataForMrowLikeElement();

  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,

                      const ReflowInput& aReflowInput,

                      nsReflowStatus& aStatus) override;

  virtual nsresult Place(DrawTarget* aDrawTarget, bool aPlaceOrigin,

                         ReflowOutput& aDesiredSize) override;

  bool IsMrowLike() override {

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

 protected:

  explicit nsMathMLmpaddedFrame(ComputedStyle* aStyle,

                                nsPresContext* aPresContext)

      : nsMathMLContainerFrame(aStyle, aPresContext, kClassID),

        mWidthSign(0),

        mHeightSign(0),

        mDepthSign(0),

        mLeadingSpaceSign(0),

        mVerticalOffsetSign(0),

        mWidthPseudoUnit(0),

        mHeightPseudoUnit(0),

        mDepthPseudoUnit(0),

        mLeadingSpacePseudoUnit(0),

        mVerticalOffsetPseudoUnit(0) {}

  virtual ~nsMathMLmpaddedFrame();

  virtual nsresult MeasureForWidth(DrawTarget* aDrawTarget,

                                   ReflowOutput& aDesiredSize) override;

 private:

  nsCSSValue mWidth;

  nsCSSValue mHeight;

  nsCSSValue mDepth;

  nsCSSValue mLeadingSpace;

  nsCSSValue mVerticalOffset;

  int32_t mWidthSign;

  int32_t mHeightSign;

  int32_t mDepthSign;

  int32_t mLeadingSpaceSign;

  int32_t mVerticalOffsetSign;

  int32_t mWidthPseudoUnit;

  int32_t mHeightPseudoUnit;

  int32_t mDepthPseudoUnit;

  int32_t mLeadingSpacePseudoUnit;

  int32_t mVerticalOffsetPseudoUnit;

  // helpers to process the attributes

  void ProcessAttributes();

  bool ParseAttribute(nsString& aString, int32_t& aSign, nsCSSValue& aCSSValue,

                      int32_t& aPseudoUnit);

  void UpdateValue(int32_t aSign, int32_t aPseudoUnit,

                   const nsCSSValue& aCSSValue,

                   const ReflowOutput& aDesiredSize, nscoord& aValueToUpdate,

                   float aFontSizeInflation) const;

};

#endif /* nsMathMLmpaddedFrame_h___ */