/* -*- 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 MOZILLA_GFX_BASEMARGIN_H_

#define MOZILLA_GFX_BASEMARGIN_H_

#include <ostream>

#include "Types.h"

namespace mozilla {

/**

 * Sides represents a set of physical sides.

 */

struct Sides final {

  Sides() : mBits(0) {}

  explicit Sides(SideBits aSideBits)

  {

    MOZ_ASSERT((aSideBits & ~eSideBitsAll) == 0, "illegal side bits");

    mBits = aSideBits;

  }

  bool IsEmpty() const { return mBits == 0; }

  bool Top()     const { return (mBits & eSideBitsTop) != 0; }

  bool Right()   const { return (mBits & eSideBitsRight) != 0; }

  bool Bottom()  const { return (mBits & eSideBitsBottom) != 0; }

  bool Left()    const { return (mBits & eSideBitsLeft) != 0; }

  bool Contains(SideBits aSideBits) const

  {

    MOZ_ASSERT((aSideBits & ~eSideBitsAll) == 0, "illegal side bits");

    return (mBits & aSideBits) == aSideBits;

  }

  Sides operator|(Sides aOther) const

  {

    return Sides(SideBits(mBits | aOther.mBits));

  }

  Sides operator|(SideBits aSideBits) const

  {

    return *this | Sides(aSideBits);

  }

  Sides& operator|=(Sides aOther)

  {

    mBits |= aOther.mBits;

    return *this;

  }

  Sides& operator|=(SideBits aSideBits)

  {

    return *this |= Sides(aSideBits);

  }

  bool operator==(Sides aOther) const

  {

    return mBits == aOther.mBits;

  }

  bool operator!=(Sides aOther) const

  {

    return !(*this == aOther);

  }

private:

  uint8_t mBits;

};

namespace gfx {

/**

 * Do not use this class directly. Subclass it, pass that subclass as the

 * Sub parameter, and only use that subclass.

 */

template <class T, class Sub>

struct BaseMargin {

  typedef mozilla::Side SideT; // because we have a method named Side

  // Do not change the layout of these members; the Side() methods below

  // depend on this order.

  T top, right, bottom, left;

  // Constructors

  BaseMargin() : top(0), right(0), bottom(0), left(0) {}

  BaseMargin(T aTop, T aRight, T aBottom, T aLeft) :

      top(aTop), right(aRight), bottom(aBottom), left(aLeft) {}

  void SizeTo(T aTop, T aRight, T aBottom, T aLeft)

  {

    top = aTop; right = aRight; bottom = aBottom; left = aLeft;

  }

  T LeftRight() const { return left + right; }

Unexecuted instantiation: mozilla::gfx::BaseMargin<float, mozilla::gfx::MarginTyped<mozilla::gfx::UnknownUnits, float> >::LeftRight() const

Unexecuted instantiation: mozilla::gfx::BaseMargin<double, mozilla::gfx::MarginTyped<mozilla::gfx::UnknownUnits, double> >::LeftRight() const

  T TopBottom() const { return top + bottom; }

Unexecuted instantiation: mozilla::gfx::BaseMargin<float, mozilla::gfx::MarginTyped<mozilla::gfx::UnknownUnits, float> >::TopBottom() const

Unexecuted instantiation: mozilla::gfx::BaseMargin<double, mozilla::gfx::MarginTyped<mozilla::gfx::UnknownUnits, double> >::TopBottom() const

  T& Side(SideT aSide) {

    // This is ugly!

    return *(&top + int(aSide));

  }

  T Side(SideT aSide) const {

    // This is ugly!

    return *(&top + int(aSide));

  }

  void ApplySkipSides(Sides aSkipSides)

  {

    if (aSkipSides.Top()) {

      top = 0;

    }

    if (aSkipSides.Right()) {

      right = 0;

    }

    if (aSkipSides.Bottom()) {

      bottom = 0;

    }

    if (aSkipSides.Left()) {

      left = 0;

    }

  }

  // Overloaded operators. Note that '=' isn't defined so we'll get the

  // compiler generated default assignment operator

  bool operator==(const Sub& aMargin) const {

    return top == aMargin.top && right == aMargin.right &&

           bottom == aMargin.bottom && left == aMargin.left;

  }

  bool operator!=(const Sub& aMargin) const {

    return !(*this == aMargin);

  }

  Sub operator+(const Sub& aMargin) const {

    return Sub(top + aMargin.top, right + aMargin.right,

               bottom + aMargin.bottom, left + aMargin.left);

  }

  Sub operator-(const Sub& aMargin) const {

    return Sub(top - aMargin.top, right - aMargin.right,

               bottom - aMargin.bottom, left - aMargin.left);

  }

  Sub& operator+=(const Sub& aMargin) {

    top += aMargin.top;

    right += aMargin.right;

    bottom += aMargin.bottom;

    left += aMargin.left;

    return *static_cast<Sub*>(this);

  }

  friend std::ostream& operator<<(std::ostream& aStream,

      const BaseMargin& aMargin) {

    return aStream << '(' << aMargin.top << ',' << aMargin.right << ','

                  << aMargin.bottom << ',' << aMargin.left << ')';

  }

};

} // namespace gfx

} // namespace mozilla

#endif /* MOZILLA_GFX_BASEMARGIN_H_ */