lily/align-note-column-engraver.cc

   1 /*
   2   align-note-column-engraver.cc --  implement Align_note_column_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "engraver.hh"
  11 #include "grace-align-item.hh"
  12 #include "note-column.hh"
  13 #include "local-key-item.hh"
  14 #include "warn.hh"
  15 #include "directional-element-interface.hh"
  16
  17 /**
  18    catch notes, and put them in a row.
  19  */
  20 class Align_note_column_engraver: public Engraver
  21 {
  22   Grace_align_item * align_item_p_;
  23   Note_column * now_column_l_;
  24   Local_key_item * accidental_l_;
  25
  26   virtual void process_acknowledged ();
  27   virtual void do_post_move_processing ();
  28   virtual void do_creation_processing ();
  29   virtual void do_removal_processing ();
  30   virtual void acknowledge_element (Score_element_info);
  31 public:
  32   VIRTUAL_COPY_CONS(Translator);
  33   Align_note_column_engraver ();
  34 };
  35
  36 Align_note_column_engraver::Align_note_column_engraver()
  37 {
  38   align_item_p_ =0;
  39   now_column_l_ =0;
  40   accidental_l_ =0;
  41 }
  42
  43 void
  44 Align_note_column_engraver::do_creation_processing ()
  45 {
  46   align_item_p_ = new Grace_align_item;
  47   // needed  for setting font size.
  48   announce_element (Score_element_info (align_item_p_, 0));
  49 }
  50
  51 void
  52 Align_note_column_engraver::do_removal_processing ()
  53 {
  54   SCM al = get_property ("graceAlignPosition", 0);
  55   if (isdir_b (al))
  56     {
  57       directional_element (align_item_p_).set (to_dir (al));
  58     }
  59
  60   typeset_element (align_item_p_);
  61   align_item_p_ =0;
  62 }
  63
  64 void
  65 Align_note_column_engraver::acknowledge_element (Score_element_info inf)
  66 {
  67   if (Note_column * n = dynamic_cast<Note_column*> (inf.elem_l_))
  68     {
  69       now_column_l_ =n;
  70     }
  71   else if (Local_key_item * it = dynamic_cast<Local_key_item*> (inf.elem_l_))
  72     {
  73       accidental_l_ = it;
  74     }
  75 }
  76 void
  77 Align_note_column_engraver::process_acknowledged ()
  78 {
  79   if (now_column_l_ && accidental_l_)
  80     {
  81
  82       /* Can't inspect  width of Local_key_item, since
  83
  84          A. it may not be fully built
  85
  86          B. it has no pscore_l_ field.
  87
  88       */
  89       SCM grsp = get_property ("graceAccidentalSpace", 0);
  90       if (gh_number_p(grsp))
  91         {
  92           /*
  93             ugh.
  94           */
  95           Real extra_space = gh_scm2double(grsp);
  96           SCM e = gh_cons (gh_double2scm (-extra_space), gh_double2scm (0.0));
  97           now_column_l_->set_elt_property ("extra-space", e);
  98         }
  99     }
 100
 101   if (now_column_l_)
 102     {
 103       align_item_p_->add_element (now_column_l_);
 104       now_column_l_ =0;
 105     }
 106 }
 107
 108 void
 109 Align_note_column_engraver::do_post_move_processing ()
 110 {
 111   now_column_l_ =0;
 112   accidental_l_ =0;
 113 }
 114
 115 ADD_THIS_TRANSLATOR(Align_note_column_engraver);
 116