/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 *
 * The Original Code is: all of this file.
 *
 * Contributor(s): none yet.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file ghost/intern/GHOST_ModifierKeys.h
 *  \ingroup GHOST
 * Declaration of GHOST_ModifierKeys struct.
 */

#ifndef __GHOST_MODIFIERKEYS_H__
#define __GHOST_MODIFIERKEYS_H__

#include "GHOST_Types.h"

/**
 * Stores the state of modifier keys.
 * Discriminates between left and right modifier keys.
 * \author	Maarten Gribnau
 * \date	May 17, 2001
 */
struct GHOST_ModifierKeys {
	/**
	 * Constructor.
	 */
	GHOST_ModifierKeys();

	virtual ~GHOST_ModifierKeys();

	/**
	 * Returns the modifier key's key code from a modifier key mask.
	 * \param mask The mask of the modifier key.
	 * \return The modifier key's key code.
	 */
	static GHOST_TKey getModifierKeyCode(GHOST_TModifierKeyMask mask);


	/**
	 * Returns the state of a single modifier key.
	 * \param mask. Key state to return.
	 * \return The state of the key (pressed == true).
	 */
	virtual bool get(GHOST_TModifierKeyMask mask) const;

	/**
	 * Updates the state of a single modifier key.
	 * \param mask. Key state to update.
	 * \param down. The new state of the key.
	 */
	virtual void set(GHOST_TModifierKeyMask mask, bool down);

	/**
	 * Sets the state of all modifier keys to up.
	 */
	virtual void clear();

	/**
	 * Determines whether to modifier key states are equal.
	 * \param keys. The modifier key state to compare to.
	 * \return Indication of equality.
	 */
	virtual bool equals(const GHOST_ModifierKeys& keys) const;

	/** Bitfield that stores the appropriate key state. */
	GHOST_TUns8 m_LeftShift : 1;
	/** Bitfield that stores the appropriate key state. */
	GHOST_TUns8 m_RightShift : 1;
	/** Bitfield that stores the appropriate key state. */
	GHOST_TUns8 m_LeftAlt : 1;
	/** Bitfield that stores the appropriate key state. */
	GHOST_TUns8 m_RightAlt : 1;
	/** Bitfield that stores the appropriate key state. */
	GHOST_TUns8 m_LeftControl : 1;
	/** Bitfield that stores the appropriate key state. */
	GHOST_TUns8 m_RightControl : 1;
	/** Bitfield that stores the appropriate key state. */
	GHOST_TUns8 m_OS : 1;
};

#endif // __GHOST_MODIFIERKEYS_H__

