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/*
Copyright (C) 2016 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 __ardour_slavable_automation_control_h__
#define __ardour_slavable_automation_control_h__
#include "ardour/automation_control.h"
#include "ardour/libardour_visibility.h"
namespace ARDOUR {
class LIBARDOUR_API SlavableAutomationControl : public AutomationControl
{
public:
SlavableAutomationControl(ARDOUR::Session&,
const Evoral::Parameter& parameter,
const ParameterDescriptor& desc,
boost::shared_ptr<ARDOUR::AutomationList> l=boost::shared_ptr<ARDOUR::AutomationList>(),
const std::string& name="",
PBD::Controllable::Flag flags=PBD::Controllable::Flag (0)
);
double get_value () const;
void add_master (boost::shared_ptr<AutomationControl>);
void remove_master (boost::shared_ptr<AutomationControl>);
void clear_masters ();
bool slaved_to (boost::shared_ptr<AutomationControl>) const;
bool slaved () const;
double get_masters_value () const {
Glib::Threads::RWLock::ReaderLock lm (master_lock);
return get_masters_value_locked ();
}
/* for toggled/boolean controls, returns a count of the number of
masters currently enabled. For other controls, returns zero.
*/
int32_t get_boolean_masters () const;
std::vector<PBD::ID> masters () const;
PBD::Signal0<void> MasterStatusChange;
protected:
class MasterRecord {
public:
MasterRecord (boost::shared_ptr<AutomationControl> gc, double r)
: _master (gc)
, _ratio (r)
{}
boost::shared_ptr<AutomationControl> master() const { return _master; }
/* for boolean/toggled controls, we store a boolean value to
* indicate if this master returned true/false (1.0/0.0) from
* ::get_value() after its most recent change.
*/
bool yn() const { return _yn; }
void set_yn (bool yn) { _yn = yn; }
/* for non-boolean/non-toggled controls, we store a ratio that
* connects the value of the master with the value of this
* slave. See comments in the source for more details on how
* this is computed and used.
*/
double ratio () const { return _ratio; }
void reset_ratio (double r) { _ratio = r; }
PBD::ScopedConnection connection;
private:
boost::shared_ptr<AutomationControl> _master;
union {
double _ratio;
bool _yn;
};
};
mutable Glib::Threads::RWLock master_lock;
typedef std::map<PBD::ID,MasterRecord> Masters;
Masters _masters;
PBD::ScopedConnectionList masters_connections;
void master_going_away (boost::weak_ptr<AutomationControl>);
double get_value_locked() const;
void actually_set_value (double val, PBD::Controllable::GroupControlDisposition group_override);
void update_boolean_masters_records (boost::shared_ptr<AutomationControl>);
virtual void master_changed (bool from_self, GroupControlDisposition gcd, boost::shared_ptr<AutomationControl>);
virtual void recompute_masters_ratios (double val) { /* do nothing by default */}
virtual double get_masters_value_locked () const;
virtual void pre_remove_master (boost::shared_ptr<AutomationControl>) {}
virtual void post_add_master (boost::shared_ptr<AutomationControl>) {}
};
} // namespace ARDOUR
#endif /* __ardour_slavable_automation_control_h__ */
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