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#ifndef __ardour_state_manager_h__
#define __ardour_state_manager_h__
#include <list>
#include <string>
#include <set>
#include <sigc++/signal.h>
#include <ardour/ardour.h>
namespace ARDOUR {
typedef uint32_t state_id_t;
class StateManager : public virtual sigc::trackable
{
public:
struct State {
std::string operation;
State (std::string why) : operation (why) {}
virtual ~State() {}
};
typedef std::list<State*> StateMap;
StateManager ();
virtual ~StateManager ();
virtual void drop_all_states ();
virtual void use_state (state_id_t);
virtual void save_state (std::string why);
sigc::signal<void,Change> StateChanged;
state_id_t _current_state_id;
virtual bool should_save_state () const { return true; }
static void prohibit_save ();
static void allow_save (const char* why, bool dosave);
protected:
static bool _allow_save;
static sigc::signal<void,const char*> SaveAllowed;
StateMap states;
virtual Change restore_state (State&) = 0;
virtual State* state_factory (std::string why) const = 0;
virtual void send_state_changed (Change);
};
} // namespace ARDOUR
#endif /* __ardour_state_manager_h__ */
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