/* -*- 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 nsMathMLmunderoverFrame_h___

#define nsMathMLmunderoverFrame_h___

#include "mozilla/Attributes.h"

#include "nsIReflowCallback.h"

#include "nsMathMLContainerFrame.h"

//

// <munderover> -- attach an underscript-overscript pair to a base

//

class nsMathMLmunderoverFrame final

  : public nsMathMLContainerFrame

  , public nsIReflowCallback

{

public:

  NS_DECL_FRAMEARENA_HELPERS(nsMathMLmunderoverFrame)

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

  nsresult Place(DrawTarget* aDrawTarget,

                 bool aPlaceOrigin,

                 ReflowOutput& aDesiredSize) override;

  NS_IMETHOD InheritAutomaticData(nsIFrame* aParent) override;

  NS_IMETHOD TransmitAutomaticData() override;

  NS_IMETHOD UpdatePresentationData(uint32_t aFlagsValues,

                                    uint32_t aFlagsToUpdate) override;

  void DestroyFrom(nsIFrame* aRoot, PostDestroyData& aPostDestroyData) override;

  nsresult AttributeChanged(int32_t aNameSpaceID,

                            nsAtom* aAttribute,

                            int32_t aModType) override;

  uint8_t ScriptIncrement(nsIFrame* aFrame) override;

  // nsIReflowCallback.

  bool ReflowFinished() override;

  void ReflowCallbackCanceled() override;

protected:

  explicit nsMathMLmunderoverFrame(ComputedStyle* aStyle)

    : nsMathMLContainerFrame(aStyle, kClassID)

    , mIncrementUnder(false)

    , mIncrementOver(false)

  {}

  virtual ~nsMathMLmunderoverFrame();

private:

  // Helper to set the "increment script level" flag on the element belonging

  // to a child frame given by aChildIndex.

  //

  // When this flag is set, the style system will increment the scriptlevel for

  // the child element. This is needed for situations where the style system

  // cannot itself determine the scriptlevel (mfrac, munder, mover, munderover).

  //

  // This should be called during reflow.

  //

  // We set the flag and if it changed, we request appropriate restyling and

  // also queue a post-reflow callback to ensure that restyle and reflow happens

  // immediately after the current reflow.

  void SetIncrementScriptLevel(uint32_t aChildIndex, bool aIncrement);

  void SetPendingPostReflowIncrementScriptLevel();

  bool mIncrementUnder;

  bool mIncrementOver;

  struct SetIncrementScriptLevelCommand

  {

    uint32_t mChildIndex;

    bool mDoIncrement;

  };

  nsTArray<SetIncrementScriptLevelCommand>

    mPostReflowIncrementScriptLevelCommands;

};

#endif /* nsMathMLmunderoverFrame_h___ */