lily/spanner-break-forbid-engraver.cc

   1 /*
   2   spanner-break-forbid-engraver.cc -- implement Spanner_break_forbid_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2007 Han-Wen Nienhuys <hanwen@lilypond.org>
   7 */
   8
   9
  10
  11 #include "engraver.hh"
  12 #include "international.hh"
  13 #include "spanner.hh"
  14 #include "stream-event.hh"
  15 #include "warn.hh"
  16 #include "context.hh"
  17
  18 #include "translator.icc"
  19
  20 class Spanner_break_forbid_engraver : public Engraver
  21 {
  22   TRANSLATOR_DECLARATIONS (Spanner_break_forbid_engraver);
  23   vector<Spanner*> running_spanners_;
  24 protected:
  25   DECLARE_ACKNOWLEDGER (unbreakable_spanner);
  26   DECLARE_END_ACKNOWLEDGER (unbreakable_spanner);
  27
  28   void process_music ();
  29 };
  30
  31
  32 void
  33 Spanner_break_forbid_engraver::process_music ()
  34 {
  35   if (running_spanners_.size ())
  36     {
  37       context ()->get_score_context ()->set_property ("forbidBreak", SCM_BOOL_T);
  38     }
  39 }
  40
  41 void
  42 Spanner_break_forbid_engraver::acknowledge_end_unbreakable_spanner (Grob_info gi)
  43 {
  44   vector<Spanner*>::iterator i = find (running_spanners_.begin (), running_spanners_.end (),
  45                                        gi.spanner ());
  46   if (i != running_spanners_.end ())
  47     running_spanners_.erase (i);
  48 }
  49
  50 void
  51 Spanner_break_forbid_engraver::acknowledge_unbreakable_spanner (Grob_info gi)
  52 {
  53   if (!to_boolean (gi.grob ()->get_property ("breakable")))
  54     running_spanners_.push_back (gi.spanner ());
  55 }
  56
  57 Spanner_break_forbid_engraver::Spanner_break_forbid_engraver ()
  58 {
  59 }
  60
  61
  62 ADD_END_ACKNOWLEDGER (Spanner_break_forbid_engraver, unbreakable_spanner);
  63 ADD_ACKNOWLEDGER (Spanner_break_forbid_engraver, unbreakable_spanner);
  64 ADD_TRANSLATOR (Spanner_break_forbid_engraver,
  65                 /* doc */
  66                 "Forbid breaks in certain spanners.",
  67
  68                 /* create */
  69                 "",
  70
  71                 /* read */
  72                 "",
  73
  74                 /* write */
  75                 ""
  76                 );