third_party/WebKit/Source/platform/LengthBox.h

/*
    Copyright (C) 1999 Lars Knoll (knoll@kde.org)
    Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
    Copyright (c) 2012, Google Inc. All rights reserved.

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#ifndef LengthBox_h
#define LengthBox_h

#include "platform/Length.h"
#include "platform/PlatformExport.h"
#include "platform/text/TextDirection.h"
#include "platform/text/WritingMode.h"
#include "wtf/Allocator.h"

namespace blink {

class PLATFORM_EXPORT LengthBox {
  DISALLOW_NEW();

 public:
  LengthBox() {}

  LengthBox(LengthType t) : m_left(t), m_right(t), m_top(t), m_bottom(t) {}

  LengthBox(int v)
      : m_left(Length(v, Fixed)),
        m_right(Length(v, Fixed)),
        m_top(Length(v, Fixed)),
        m_bottom(Length(v, Fixed)) {}

  LengthBox(const Length& t, const Length& r, const Length& b, const Length& l)
      : m_left(l), m_right(r), m_top(t), m_bottom(b) {}

  LengthBox(int t, int r, int b, int l)
      : m_left(Length(l, Fixed)),
        m_right(Length(r, Fixed)),
        m_top(Length(t, Fixed)),
        m_bottom(Length(b, Fixed)) {}

  // For use in ComputedStyle.h
  static const Length& logicalLeft(WritingMode,
                                   const Length& left,
                                   const Length& top);
  static const Length& logicalRight(WritingMode,
                                    const Length& right,
                                    const Length& bottom);
  static const Length& before(WritingMode,
                              const Length& top,
                              const Length& left,
                              const Length& right);
  static const Length& after(WritingMode,
                             const Length& bottom,
                             const Length& left,
                             const Length& right);

  const Length& left() const { return m_left; }
  const Length& right() const { return m_right; }
  const Length& top() const { return m_top; }
  const Length& bottom() const { return m_bottom; }

  const Length& logicalLeft(WritingMode) const;
  const Length& logicalRight(WritingMode) const;

  const Length& before(WritingMode) const;
  const Length& after(WritingMode) const;
  const Length& start(WritingMode, TextDirection) const;
  const Length& end(WritingMode, TextDirection) const;
  const Length& over(WritingMode) const;
  const Length& under(WritingMode) const;

  bool operator==(const LengthBox& o) const {
    return m_left == o.m_left && m_right == o.m_right && m_top == o.m_top &&
           m_bottom == o.m_bottom;
  }

  bool operator!=(const LengthBox& o) const { return !(*this == o); }

  bool nonZero() const {
    return !(m_left.isZero() && m_right.isZero() && m_top.isZero() &&
             m_bottom.isZero());
  }

  // Must be public for SET_VAR in ComputedStyle.h
  Length m_left;
  Length m_right;
  Length m_top;
  Length m_bottom;
};

}  // namespace blink

#endif  // LengthBox_h