proxy_controllable.h

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/*
 * Copyright (C) 2011-2014 David Robillard <d@drobilla.net>
 * Copyright (C) 2011-2016 Paul Davis <paul@linuxaudiosystems.com>
 *
 * 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.
 */
 
#pragma once
 
 
#include <functional>
 
#include "pbd/controllable.h"
 
#include "ardour/dB.h"
#include "ardour/libardour_visibility.h"
 
namespace ARDOUR {
 
class LIBARDOUR_API ProxyControllable : public PBD::Controllable {
  public:
        ProxyControllable (const std::string& name, PBD::Controllable::Flag flags,
                           std::function<bool (double)> setter,
                           std::function<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:
        std::function<bool (double)> _setter;
        std::function<double ()>     _getter;
};
 
} // namespace