1 #ifndef __pbd_controllable_h__
2 #define __pbd_controllable_h__
4 #include <sigc++/trackable.h>
5 #include <sigc++/signal.h>
7 #include <pbd/stateful.h>
14 class Controllable : public virtual sigc::trackable, public Stateful {
17 virtual ~Controllable() { GoingAway (this); }
19 virtual void set_value (float) = 0;
20 virtual float get_value (void) const = 0;
22 virtual bool can_send_feedback() const { return true; }
24 static sigc::signal<void,Controllable*> Created;
25 static sigc::signal<void,Controllable*> GoingAway;
28 static sigc::signal<bool,PBD::Controllable*> StartLearning;
29 static sigc::signal<void,PBD::Controllable*> StopLearning;
31 sigc::signal<void> Changed;
33 const PBD::ID& id() const { return _id; }
35 int set_state (const XMLNode&) { return 0; }
36 XMLNode& get_state ();
44 #endif /* __pbd_controllable_h__ */