solo_isolate_control.h

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/*
 * Copyright (C) 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 <memory>
#include <string>
 
#include "ardour/slavable_automation_control.h"
#include "ardour/libardour_visibility.h"
 
class XMLNode;
 
namespace ARDOUR {
 
class Session;
class Soloable;
class Muteable;
 
class LIBARDOUR_API SoloIsolateControl : public SlavableAutomationControl
{
  public:
        SoloIsolateControl (Session& session, std::string const & name, Soloable& soloable, Temporal::TimeDomainProvider const &);
 
        double get_value () const;
 
        /* Export additional API so that objects that only get access
         * to a Controllable/AutomationControl can do more fine-grained
         * operations with respect to solo isolate. Obviously, they would need
         * to dynamic_cast<SoloControl> first.
         *
         * Solo Isolate state is not representable by a single scalar value,
         * so set_value() and get_value() is not enough.
         *
         * This means that the Controllable is technically
         * asymmetric. It is possible to call ::set_value (0.0) to
         * disable (self)solo, and then call ::get_value() and get a
         * return of 1.0 because the control is isolated by
         * upstream/downstream or a master.
         */
 
        void mod_solo_isolated_by_upstream (int32_t delta);
 
        /* API to check different aspects of solo isolate substate
         */
 
        uint32_t solo_isolated_by_upstream () const {
                return _solo_isolated_by_upstream;
        }
        bool self_solo_isolated () const {
                return _solo_isolated;
        }
        bool solo_isolated() const { return self_solo_isolated() || solo_isolated_by_upstream(); }
 
        int set_state (XMLNode const&, int);
        XMLNode& get_state () const;
 
  protected:
        void master_changed (bool from_self, PBD::Controllable::GroupControlDisposition gcd, std::weak_ptr<AutomationControl>);
        void actually_set_value (double, PBD::Controllable::GroupControlDisposition group_override);
 
  private:
        Soloable&      _soloable;
        bool           _solo_isolated;
        uint32_t       _solo_isolated_by_upstream;
 
        void set_solo_isolated (bool yn, Controllable::GroupControlDisposition group_override);
 
};
 
} /* namespace */