lily/output-property-engraver.cc

   1 /*
   2   output-property-engraver.cc -- implement Output_property_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>
   7
   8  */
   9
  10 #include "engraver.hh"
  11 #include "context.hh"
  12 #include "grob.hh"
  13 #include "stream-event.hh"
  14
  15 #include "translator.icc"
  16
  17
  18 class Output_property_engraver : public Engraver
  19 {
  20   TRANSLATOR_DECLARATIONS (Output_property_engraver);
  21 protected:
  22   vector<Stream_event*> props_;
  23
  24   DECLARE_ACKNOWLEDGER (grob);
  25   DECLARE_TRANSLATOR_LISTENER (apply_output);
  26
  27   void stop_translation_timestep ();
  28 };
  29
  30 IMPLEMENT_TRANSLATOR_LISTENER (Output_property_engraver, apply_output);
  31 void
  32 Output_property_engraver::listen_apply_output (Stream_event *ev)
  33 {
  34   /*
  35     UGH. Only swallow the output property event in the context
  36     it was intended for. This is inelegant but not inefficient.
  37   */
  38   if (context ()->is_alias (ev->get_property ("context-type")))
  39     props_.push_back (ev);
  40 }
  41
  42 void
  43 Output_property_engraver::acknowledge_grob (Grob_info inf)
  44 {
  45   for (vsize i = props_.size (); i--;)
  46     {
  47       Stream_event *o = props_[i];
  48       Context *d = inf.context ();
  49       SCM proc = o->get_property ("procedure");
  50       scm_call_3 (proc,
  51                   inf.grob ()->self_scm (),
  52                   d->self_scm (),
  53                   context ()->self_scm ());
  54     }
  55 }
  56
  57 void
  58 Output_property_engraver::stop_translation_timestep ()
  59 {
  60   props_.clear ();
  61 }
  62
  63 Output_property_engraver::Output_property_engraver ()
  64 {
  65 }
  66
  67 ADD_ACKNOWLEDGER (Output_property_engraver, grob);
  68 ADD_TRANSLATOR (Output_property_engraver,
  69                 /* doc */
  70                 "Apply a procedure to any grob acknowledged.",
  71
  72                 /* create */
  73                 "",
  74
  75                 /* read */
  76                 "",
  77
  78                 /* write */
  79                 ""
  80                 );