event_listener.h

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/* Copyright, 2000 Nevrax Ltd.
 *
 * This file is part of NEVRAX NEL.
 * NEVRAX NEL 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, or (at your option)
 * any later version.

 * NEVRAX NEL 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 NEVRAX NEL; see the file COPYING. If not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

#ifndef NL_EVENT_LISTENER_H
#define NL_EVENT_LISTENER_H

#include "types_nl.h"
#include "events.h"
#include "bit_set.h"


namespace NLMISC {

class CEvent;
class CEventServer;

class IEventListener
{
public:

    IEventListener();
    virtual ~IEventListener() {}

    virtual void process(const CEvent& event)
    {
        if (_Hook)
        {
            _Hook->process(event);
        }
        else
        {
            (*this)(event);
        }
    }

    virtual void operator ()(const CEvent& event)=0;

    // Set a hook which can intercept msgs.
    void            setHook(IEventListener *hook) { _Hook = hook; }
    IEventListener *getHook() const  { return _Hook; }
private:
    IEventListener *_Hook;
};


class CEventListenerAsync: public IEventListener
{
public:

    CEventListenerAsync();
    virtual ~CEventListenerAsync() {}

    void addToServer (CEventServer& server);

    void removeFromServer (CEventServer& server);

    bool isKeyDown(TKey key) const;

    bool isKeyPushed (TKey key, bool release=true);


    void reset ();


protected:
    /*
     * Call back of the listener.
     * \param event is the event send to the listener
     */
    virtual void operator ()(const CEvent& event);
    CBitSet _KeyArray;
    // Must have 2 arrays because of key repetition...
    CBitSet _KeyDownArray, _KeyReleaseArray;
};


} // NLMISC


#endif // NL_EVENT_LISTENER_H

/* End of event_listener.h */