third_party/WebKit/Source/core/layout/FlexibleBoxAlgorithm.h

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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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 "platform/wtf/Noncopyable.h"
#include "platform/wtf/Vector.h"

namespace blink {

class LayoutBox;

class FlexItem {
 public:
  FlexItem(LayoutBox*,
           LayoutUnit flex_base_content_size,
           LayoutUnit hypothetical_main_content_size,
           LayoutUnit main_axis_border_and_padding,
           LayoutUnit main_axis_margin);

  LayoutUnit HypotheticalMainAxisMarginBoxSize() const {
    return hypothetical_main_content_size + main_axis_border_and_padding +
           main_axis_margin;
  }

  LayoutUnit FlexBaseMarginBoxSize() const {
    return flex_base_content_size + main_axis_border_and_padding +
           main_axis_margin;
  }

  LayoutUnit FlexedMarginBoxSize() const {
    return flexed_content_size + main_axis_border_and_padding +
           main_axis_margin;
  }

  LayoutBox* box;
  const LayoutUnit flex_base_content_size;
  const LayoutUnit hypothetical_main_content_size;
  const LayoutUnit main_axis_border_and_padding;
  const LayoutUnit main_axis_margin;
  LayoutUnit flexed_content_size;
  bool frozen;
};

class FlexLayoutAlgorithm {
  WTF_MAKE_NONCOPYABLE(FlexLayoutAlgorithm);

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

  // 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& next_index,
                           Vector<FlexItem>& line_items,
                           LayoutUnit& sum_flex_base_size,
                           double& total_flex_grow,
                           double& total_flex_shrink,
                           double& total_weighted_flex_shrink,
                           LayoutUnit& sum_hypothetical_main_size);

 private:
  bool IsMultiline() const { return style_->FlexWrap() != EFlexWrap::kNowrap; }

  const ComputedStyle* style_;
  LayoutUnit line_break_length_;
  const Vector<FlexItem>& all_items_;
};

}  // namespace blink

#endif  // FlexibleBoxAlgorithm_h