X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Finclude%2Ftranslator.hh;h=871b87a95dd3cad5729f5eac3ead83850efe7998;hb=4bb9b76b24375ccfb887bfd533c31c5a02975613;hp=f6b3c8881936de24e34292e515a69ae2fc3154e5;hpb=b3cf2199183a184c7eef9a9f8f3c9a691db1f0ad;p=lilypond.git

diff --git a/lily/include/translator.hh b/lily/include/translator.hh
index f6b3c88819..871b87a95d 100644
--- a/lily/include/translator.hh
+++ b/lily/include/translator.hh
@@ -16,6 +16,7 @@
 #include "input.hh"
 #include "smobs.hh"
 #include "std-vector.hh"
+#include "protected-scm.hh"
 
 struct Acknowledge_information
 {
@@ -23,7 +24,21 @@ struct Acknowledge_information
   Engraver_void_function_engraver_grob_info function_;
 };
 
+
+/*
+  Each translator class has a static list of listener records. Each
+  record makes one explains how to register one of the class's stream event
+  listeners to a context.
+*/
+typedef struct translator_listener_record {
+  Listener (*get_listener_) (void *);
+  SCM event_class_;
+  struct translator_listener_record *next_;
+} translator_listener_record;
+
 #define TRANSLATOR_DECLARATIONS(NAME)					\
+private:								\
+  static translator_listener_record *listener_list_;			\
   public:								\
   NAME ();								\
   VIRTUAL_COPY_CONSTRUCTOR (Translator, NAME);				\
@@ -42,8 +57,21 @@ struct Acknowledge_information
   } \
   static Engraver_void_function_engraver_grob_info static_get_acknowledger (SCM sym); \
   static Engraver_void_function_engraver_grob_info static_get_end_acknowledger(SCM); \
+public:									\
+  virtual translator_listener_record *get_listener_list () const	\
+  {									\
+    return listener_list_;						\
+  }									\
   /* end #define */
 
+#define DECLARE_TRANSLATOR_LISTENER(m)			\
+public:							\
+inline void listen_ ## m (Stream_event *);		\
+/* Should be private */					\
+static void _internal_declare_ ## m ();			\
+private:						\
+static Listener _get_ ## m ## _listener (void *);	\
+DECLARE_LISTENER (_listen_scm_ ## m);
 
 #define DECLARE_ACKNOWLEDGER(x) public : void acknowledge_ ## x (Grob_info); protected:
 #define DECLARE_END_ACKNOWLEDGER(x) public : void acknowledge_end_ ## x (Grob_info); protected:
@@ -84,12 +112,16 @@ public:
   virtual void initialize ();
   virtual void finalize ();
 
+  /*should maybe be virtual*/
+  void connect_to_context (Context *c);
+  void disconnect_from_context (Context *c);
+
   void stop_translation_timestep ();
   void start_translation_timestep ();
   void process_music ();
   void process_acknowledged ();
 
-  Score_context *get_score_context () const;
+  Context *get_score_context () const;
   Global_context *get_global_context () const;
 
   TRANSLATOR_DECLARATIONS (Translator);
@@ -97,12 +129,15 @@ public:
 
 protected:			// should be private.
   Context *daddy_context_;
+  void protect_event (SCM ev);
   virtual void derived_mark () const;
+  static void add_translator_listener (translator_listener_record **listener_list, translator_listener_record *r, Listener (*get_listener) (void *), const char *ev_class);
 
   friend class Translator_group;
 };
 void add_translator (Translator *trans);
 
 Translator *get_translator (SCM s);
+Moment get_event_length (Stream_event *s);
 DECLARE_UNSMOB (Translator, translator);
 #endif // TRANSLATOR_HH