/*
    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 {

/** this class converts a pair of setter/getter functors into a Controllable
    so that it can be used like a regular Controllable, bound to MIDI, OSC etc.
*/

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, PBD::Controllable::GroupControlDisposition gcd) { if (_setter (v)) { Changed (true, gcd); /* EMIT SIGNAL */ } }
	double get_value () const { return _getter (); }

	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__ */