/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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 */

#ifndef FlexibleBoxAlgorithm_h
#define FlexibleBoxAlgorithm_h

#include "core/CoreExport.h"
#include "core/layout/OrderIterator.h"
#include "core/style/ComputedStyle.h"
#include "platform/LayoutUnit.h"
#include "wtf/Noncopyable.h"
#include "wtf/Vector.h"

namespace blink {

class LayoutBox;

class FlexItem {
 public:
  FlexItem(LayoutBox*,
           LayoutUnit flexBaseContentSize,
           LayoutUnit hypotheticalMainContentSize,
           LayoutUnit mainAxisBorderAndPadding,
           LayoutUnit mainAxisMargin);

  LayoutUnit hypotheticalMainAxisMarginBoxSize() const {
    return hypotheticalMainContentSize + mainAxisBorderAndPadding +
           mainAxisMargin;
  }

  LayoutUnit flexBaseMarginBoxSize() const {
    return flexBaseContentSize + mainAxisBorderAndPadding + mainAxisMargin;
  }

  LayoutUnit flexedMarginBoxSize() const {
    return flexedContentSize + mainAxisBorderAndPadding + mainAxisMargin;
  }

  LayoutBox* box;
  const LayoutUnit flexBaseContentSize;
  const LayoutUnit hypotheticalMainContentSize;
  const LayoutUnit mainAxisBorderAndPadding;
  const LayoutUnit mainAxisMargin;
  LayoutUnit flexedContentSize;
  bool frozen;
};

class FlexLayoutAlgorithm {
  WTF_MAKE_NONCOPYABLE(FlexLayoutAlgorithm);

 public:
  FlexLayoutAlgorithm(const ComputedStyle*,
                      LayoutUnit lineBreakLength,
                      const Vector<FlexItem>& allItems);

  // The hypothetical main size of an item is the flex base size clamped
  // according to its min and max main size properties
  bool ComputeNextFlexLine(size_t& nextIndex,
                           Vector<FlexItem>& lineItems,
                           LayoutUnit& sumFlexBaseSize,
                           double& totalFlexGrow,
                           double& totalFlexShrink,
                           double& totalWeightedFlexShrink,
                           LayoutUnit& sumHypotheticalMainSize);

 private:
  bool isMultiline() const { return m_style->flexWrap() != FlexNoWrap; }

  const ComputedStyle* m_style;
  LayoutUnit m_lineBreakLength;
  const Vector<FlexItem>& m_allItems;
};

}  // namespace blink

#endif  // FlexibleBoxAlgorithm_h
