proxy_controllable.h

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/*
    Copyright (C) 2010-2011 Paul Davis

    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., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef __libardour_proxy_controllable_h__
#define __libardour_proxy_controllable_h__

#include <boost/function.hpp>

#include "pbd/controllable.h"

namespace ARDOUR {

class LIBARDOUR_API ProxyControllable : public PBD::Controllable {
public:
        ProxyControllable (const std::string& name, PBD::Controllable::Flag flags,
                           boost::function1<bool,double> setter,
                           boost::function0<double> getter)
                : PBD::Controllable (name, flags)
                , _setter (setter)
                , _getter (getter)
        {}

        void set_value (double v) { if (_setter (v)) { Changed(); /* EMIT SIGNAL */ } }
        double get_value () const { return _getter (); }

        double internal_to_user (double i) const { return accurate_coefficient_to_dB (i);}
        double user_to_internal (double u) const { return dB_to_coefficient(u) ;}

        std::string get_user_string () const {
                char theBuf[32]; sprintf( theBuf, "%3.1f dB", accurate_coefficient_to_dB (get_value()));
                return std::string(theBuf);
        }

private:
        boost::function1<bool,double> _setter;
        boost::function0<double> _getter;
};

} // namespace

#endif /* __libardour_proxy_controllable_h__ */