gecko-dev/layout/mathml/nsMathMLmoFrame.h

/* -*- 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 nsMathMLmoFrame_h___
#define nsMathMLmoFrame_h___

#include "mozilla/Attributes.h"
#include "nsMathMLTokenFrame.h"
#include "nsMathMLChar.h"

namespace mozilla {
class PresShell;
}  // namespace mozilla

//
// <mo> -- operator, fence, or separator
//

class nsMathMLmoFrame final : public nsMathMLTokenFrame {
 public:
  NS_DECL_FRAMEARENA_HELPERS(nsMathMLmoFrame)

  friend nsIFrame* NS_NewMathMLmoFrame(mozilla::PresShell* aPresShell,
                                       ComputedStyle* aStyle);

  eMathMLFrameType GetMathMLFrameType() override;

  void DidSetComputedStyle(ComputedStyle* aOldStyle) override;

  void BuildDisplayList(nsDisplayListBuilder* aBuilder,
                        const nsDisplayListSet& aLists) override;

  NS_IMETHOD
  InheritAutomaticData(nsIFrame* aParent) override;

  NS_IMETHOD
  TransmitAutomaticData() override;

  virtual void SetInitialChildList(ChildListID aListID,
                                   nsFrameList& aChildList) override;

  virtual void Reflow(nsPresContext* aPresContext, ReflowOutput& aDesiredSize,
                      const ReflowInput& aReflowInput,
                      nsReflowStatus& aStatus) override;

  virtual nsresult Place(DrawTarget* aDrawTarget, bool aPlaceOrigin,
                         ReflowOutput& aDesiredSize) override;

  virtual void MarkIntrinsicISizesDirty() override;

  virtual void GetIntrinsicISizeMetrics(gfxContext* aRenderingContext,
                                        ReflowOutput& aDesiredSize) override;

  virtual nsresult AttributeChanged(int32_t aNameSpaceID, nsAtom* aAttribute,
                                    int32_t aModType) override;

  // This method is called by the parent frame to ask <mo>
  // to stretch itself.
  NS_IMETHOD
  Stretch(DrawTarget* aDrawTarget, nsStretchDirection aStretchDirection,
          nsBoundingMetrics& aContainerSize,
          ReflowOutput& aDesiredStretchSize) override;

  virtual nsresult ChildListChanged(int32_t aModType) override {
    ProcessTextData();
    return nsMathMLContainerFrame::ChildListChanged(aModType);
  }

 protected:
  explicit nsMathMLmoFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
      : nsMathMLTokenFrame(aStyle, aPresContext, kClassID),
        mFlags(0),
        mMinSize(0),
        mMaxSize(0) {}
  virtual ~nsMathMLmoFrame();

  nsMathMLChar
      mMathMLChar;  // Here is the MathMLChar that will deal with the operator.
  nsOperatorFlags mFlags;
  float mMinSize;
  float mMaxSize;

  bool UseMathMLChar();

  // overload the base method so that we can setup our nsMathMLChar
  void ProcessTextData();

  // helper to get our 'form' and lookup in the Operator Dictionary to fetch
  // our default data that may come from there, and to complete the setup
  // using attributes that we may have
  void ProcessOperatorData();

  // helper to double check thar our char should be rendered as a selected char
  bool IsFrameInSelection(nsIFrame* aFrame);
};

#endif /* nsMathMLmoFrame_h___ */