rewrite balloon-text support. This is now a separate grob, with its

[lilypond.git] / lily / balloon-engraver.cc

diff --git a/lily/balloon-engraver.cc b/lily/balloon-engraver.cc
new file mode 100644 (file)
index 0000000..374d691
--- /dev/null
+++ b/lily/balloon-engraver.cc
@@ -0,0 +1,88 @@
+/* 
+  balloon-engraver.cc -- implement Balloon_engraver
+  
+  source file of the GNU LilyPond music typesetter
+  
+  (c) 2006 Han-Wen Nienhuys <hanwen@lilypond.org>
+  
+*/
+
+#include "engraver.hh"
+
+
+#include "stream-event.hh"
+#include "item.hh"
+
+#include "translator.icc"
+
+class Balloon_engraver : public Engraver
+{
+  TRANSLATOR_DECLARATIONS(Balloon_engraver);
+
+  DECLARE_TRANSLATOR_LISTENER(annotate_output);
+  DECLARE_ACKNOWLEDGER(grob);
+  vector<Stream_event *> events_;
+
+  void stop_translation_timestep ();
+  
+  void balloonify (Grob *, Stream_event *); 
+};
+
+IMPLEMENT_TRANSLATOR_LISTENER (Balloon_engraver, annotate_output);
+void
+Balloon_engraver::listen_annotate_output (Stream_event *ev)
+{
+  events_.push_back (ev);
+}
+
+void
+Balloon_engraver::stop_translation_timestep ()
+{
+  events_.clear ();
+}
+
+Balloon_engraver::Balloon_engraver ()
+{
+}
+
+void
+Balloon_engraver::balloonify (Grob *g, Stream_event *event)
+{
+  Grob * b = make_item ("BalloonTextItem", event->self_scm ());
+  b->set_property ("text", event->get_property ("text"));
+  b->set_parent (g, Y_AXIS);
+  b->set_parent (g, X_AXIS);
+}
+
+void
+Balloon_engraver::acknowledge_grob (Grob_info info)
+{
+  Stream_event *cause = info.event_cause ();
+  
+  SCM arts = cause ? cause->get_property ("articulations") : SCM_EOL;
+  for (SCM s = arts; scm_is_pair (s); s = scm_cdr (s))
+    {
+      Stream_event *e = unsmob_stream_event (scm_car (s));
+      if (e->in_event_class ("annotate-output-event"))
+       {
+         balloonify (info.grob (), e);
+       }
+    }
+
+  for (vsize i = 0; i < events_.size (); i++)
+    {
+      if (info.grob ()->name () == ly_symbol2string (events_[i]->get_property ("symbol")))
+       balloonify (info.grob (), events_[i]);
+    }
+}
+
+
+  
+ADD_ACKNOWLEDGER(Balloon_engraver,grob);
+  
+ADD_TRANSLATOR(Balloon_engraver,
+              "Create balloon texts",
+              "BalloonTextItem ",
+              /*read*/ "",
+              /*write*/ ""
+              );