204 lines
6.9 KiB
C++
204 lines
6.9 KiB
C++
/*
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* Copyright (C) 2006-2017 Paul Davis <paul@linuxaudiosystems.com>
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* Copyright (C) 2008-2009 David Robillard <d@drobilla.net>
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* Copyright (C) 2009-2012 Carl Hetherington <carl@carlh.net>
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* Copyright (C) 2014 Ben Loftis <ben@harrisonconsoles.com>
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* Copyright (C) 2015-2019 Robin Gareus <robin@gareus.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __pbd_controllable_h__
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#define __pbd_controllable_h__
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#include <memory>
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#include <string>
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#include <set>
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#include "pbd/libpbd_visibility.h"
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#include "pbd/signals.h"
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#include <glibmm/threads.h>
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#include "pbd/statefuldestructible.h"
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class XMLNode;
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namespace PBD {
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class Controllable;
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typedef std::set<std::shared_ptr<Controllable>> ControllableSet;
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/** This is a pure virtual class to represent a scalar control.
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*
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* Note that it contains no storage/state for the controllable thing that it
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* represents. Derived classes must provide set_value()/get_value() methods,
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* which will involve (somehow) an actual location to store the value.
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*
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* In essence, this is an interface, not a class.
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*
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* Without overriding upper() and lower(), a derived class will function
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* as a control whose value can range between 0 and 1.0.
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*
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*
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* We express Controllable values in one of three ways:
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* 1. `user' --- as presented to the user (e.g. dB, Hz, etc.)
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* 2. `interface' --- as used in some cases for the UI representation
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* (in order to make controls behave logarithmically).
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* 3. `internal' --- as passed to a processor, track, plugin, or whatever.
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*
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* Note that in some cases user and internal may be the same
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* (and interface different) e.g. frequency, which is presented
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* to the user and passed to the processor in linear terms, but
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* which needs log scaling in the interface.
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*
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* In other cases, user and interface may be the same (and internal different)
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* e.g. gain, which is presented to the user in log terms (dB)
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* but passed to the processor as a linear quantity.
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*/
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class LIBPBD_API Controllable : public PBD::StatefulDestructible, public std::enable_shared_from_this<Controllable>
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{
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public:
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enum Flag {
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Toggle = 0x01,
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GainLike = 0x02,
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RealTime = 0x04,
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NotAutomatable = 0x08,
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InlineControl = 0x10,
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HiddenControl = 0x20,
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};
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Controllable (const std::string& name, Flag f = Flag (0));
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/** Within an application, various Controllables might be considered to
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* be "grouped" in a way that implies that setting 1 of them also
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* modifies others in the group.
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*/
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enum GroupControlDisposition {
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InverseGroup, /**< set all controls in the same "group" as this one */
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NoGroup, /**< set only this control */
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UseGroup, /**< use group settings to decide which group controls are altered */
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ForGroup /**< this setting is being done *for* the group (i.e. UseGroup was set in the callchain somewhere). */
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};
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/** Set `internal' value
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*
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* All derived classes must implement this.
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*
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* Basic derived classes will ignore \p group_override
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* but more sophisticated children, notably those that
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* proxy the value setting logic via an object that is aware of group
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* relationships between this control and others, will find it useful.
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*
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* @param value raw numeric value to set
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* @param group_override if and how to propagate value to grouped controls
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*/
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virtual void set_value (double value, GroupControlDisposition group_override) = 0;
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/** Get `internal' value
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* @return raw value as used for the plugin/processor control port
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*/
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virtual double get_value (void) const = 0;
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/** This is used when saving state. By default it just calls
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* get_value(), but a class with more complex semantics might override
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* this to save some value that differs from what get_value() would
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* return.
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*/
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virtual double get_save_value () const { return get_value(); }
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/** Conversions between `internal', 'interface', and 'user' values */
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virtual double internal_to_interface (double i, bool rotary = false) const {
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/* by default, the interface range is just a linear
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* interpolation between lower and upper values */
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return (i-lower())/(upper() - lower());
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}
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virtual double interface_to_internal (double i, bool rotary = false) const {
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return lower() + i*(upper() - lower());
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}
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/** Get and Set `interface' value (typically, fraction of knob travel) */
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virtual float get_interface(bool rotary=false) const { return (internal_to_interface(get_value(), rotary)); }
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virtual void set_interface (float fraction, bool rotary=false, GroupControlDisposition gcd = NoGroup);
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virtual std::string get_user_string() const { return std::string(); }
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PBD::Signal0<void> LearningFinished;
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static PBD::Signal1<bool, std::weak_ptr<PBD::Controllable> > StartLearning;
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static PBD::Signal1<void, std::weak_ptr<PBD::Controllable> > StopLearning;
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static PBD::Signal1<void, std::weak_ptr<PBD::Controllable> > GUIFocusChanged;
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static PBD::Signal1<void, std::weak_ptr<PBD::Controllable> > ControlTouched;
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PBD::Signal2<void,bool,PBD::Controllable::GroupControlDisposition> Changed;
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int set_state (const XMLNode&, int version);
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virtual XMLNode& get_state () const;
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std::string name() const { return _name; }
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bool touching () const { return _touching; }
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PBD::Signal0<void> TouchChanged;
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bool is_toggle() const { return _flags & Toggle; }
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bool is_gain_like() const { return _flags & GainLike; }
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virtual double lower() const { return 0.0; }
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virtual double upper() const { return 1.0; }
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virtual double normal() const { return 0.0; } //the default value
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Flag flags() const { return _flags; }
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void set_flags (Flag f);
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void set_flag (Flag f); ///< _flags |= f;
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void clear_flag (Flag f); ///< _flags &= ~f;
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static std::shared_ptr<Controllable> by_id (const PBD::ID&);
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static void dump_registry ();
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static ControllableSet registered_controllables ();
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static const std::string xml_node_name;
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protected:
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void set_touching (bool yn) {
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if (_touching == yn) { return; }
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_touching = yn;
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TouchChanged (); /* EMIT SIGNAL */
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}
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private:
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std::string _name;
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std::string _units;
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Flag _flags;
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bool _touching;
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typedef std::set<PBD::Controllable*> Controllables;
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static ScopedConnectionList registry_connections;
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static Glib::Threads::RWLock registry_lock;
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static Controllables registry;
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static void add (Controllable&);
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static void remove (Controllable*);
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};
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}
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#endif /* __pbd_controllable_h__ */
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