// -*- C++ -*-
/**
 * \file key_state.h
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * Keyboard modifier state representation.
 *
 * \author John Levon
 *
 * Full author contact details are available in file CREDITS.
 */

#ifndef KEY_STATE_H
#define KEY_STATE_H

namespace lyx {

/// modifier key states
namespace key_modifier {

enum state {
	none  = 0, //< no modifiers held
	ctrl  = 1, //< control button held
	alt   = 2, //< alt/meta key held
	shift = 4  //< shift key held
};


inline state operator|(state const & s1, state const & s2)
{
	int const i1 = static_cast<int>(s1);
	int const i2 = static_cast<int>(s2);
	return static_cast<state>(i1 | i2);
}


inline void operator|=(state & s1, state s2)
{
	s1 = static_cast<state>(s1 | s2);
}

} // namespace key_modifier


} // namespace lyx

#endif // KEY_STATE_H