nsMathMLmrootFrame.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 nsMathMLmrootFrame_h___

#define nsMathMLmrootFrame_h___

#include "mozilla/Attributes.h"

#include "nsMathMLContainerFrame.h"

#include "nsMathMLChar.h"

namespace mozilla {

class PresShell;

}  // namespace mozilla

//

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

//

class nsMathMLmrootFrame final : public nsMathMLContainerFrame {

 public:

  NS_DECL_FRAMEARENA_HELPERS(nsMathMLmrootFrame)

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

                                          ComputedStyle* aStyle);

  void DidSetComputedStyle(ComputedStyle* aOldStyle) override;

  virtual void Init(nsIContent* aContent, nsContainerFrame* aParent,

                    nsIFrame* aPrevInFlow) override;

  NS_IMETHOD

  TransmitAutomaticData() override;

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

                      const ReflowInput& aReflowInput,

                      nsReflowStatus& aStatus) override;

  void GetRadicalXOffsets(nscoord aIndexWidth, nscoord aSqrWidth,

                          nsFontMetrics* aFontMetrics, nscoord* aIndexOffset,

                          nscoord* aSqrOffset);

  virtual void GetIntrinsicISizeMetrics(gfxContext* aRenderingContext,

                                        ReflowOutput& aDesiredSize) override;

  virtual void BuildDisplayList(nsDisplayListBuilder* aBuilder,

                                const nsDisplayListSet& aLists) override;

  uint8_t ScriptIncrement(nsIFrame* aFrame) override {

    return (aFrame && aFrame == mFrames.LastChild()) ? 2 : 0;

 protected:

  explicit nsMathMLmrootFrame(ComputedStyle* aStyle,

                              nsPresContext* aPresContext);

  virtual ~nsMathMLmrootFrame();

  nsMathMLChar mSqrChar;

  nsRect mBarRect;

 private:

  bool ShouldUseRowFallback();

};

#endif /* nsMathMLmrootFrame_h___ */