/* -*- 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/. */

/*

 * a list of the recomputation that needs to be done in response to a

 * style change

 */

#ifndef nsStyleChangeList_h___

#define nsStyleChangeList_h___

#include "mozilla/Attributes.h"

#include "nsChangeHint.h"

#include "nsCOMPtr.h"

class nsIFrame;

class nsIContent;

struct nsStyleChangeData

{

  nsIFrame* mFrame; // weak

  nsCOMPtr<nsIContent> mContent;

  nsChangeHint mHint;

};

class nsStyleChangeList : private AutoTArray<nsStyleChangeData, 10>

{

  typedef AutoTArray<nsStyleChangeData, 10> base_type;

  nsStyleChangeList(const nsStyleChangeList&) = delete;

public:

  using base_type::begin;

  using base_type::end;

  using base_type::IsEmpty;

  using base_type::Clear;

  using base_type::Length;

  using base_type::operator[];

  nsStyleChangeList() {

    MOZ_COUNT_CTOR(nsStyleChangeList);

  }

  ~nsStyleChangeList() { MOZ_COUNT_DTOR(nsStyleChangeList); }

  void AppendChange(nsIFrame* aFrame, nsIContent* aContent, nsChangeHint aHint);

  // Starting from the end of the list, removes all changes until the list is

  // empty or an element with |mContent != aContent| is found.

  void PopChangesForContent(nsIContent* aContent)

  {

    while (!IsEmpty() && LastElement().mContent == aContent) {

      RemoveLastElement();

    }

  }

};

#endif /* nsStyleChangeList_h___ */