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
  16 /**
  17    catch notes, and put them in a row.
  18  */
  19 class Align_note_column_engraver: public Engraver
  20 {
  21   Grace_align_item * align_item_p_;
  22   Note_column * now_column_l_;
  23   Local_key_item * accidental_l_;
  24
  25   virtual void process_acknowledged ();
  26   virtual void do_post_move_processing ();
  27   virtual void do_creation_processing ();
  28   virtual void do_removal_processing ();
  29   virtual void acknowledge_element (Score_element_info);
  30 public:
  31   VIRTUAL_COPY_CONS(Translator);
  32   Align_note_column_engraver ();
  33 };
  34
  35 Align_note_column_engraver::Align_note_column_engraver()
  36 {
  37   align_item_p_ =0;
  38   now_column_l_ =0;
  39   accidental_l_ =0;
  40 }
  41
  42 void
  43 Align_note_column_engraver::do_creation_processing ()
  44 {
  45   align_item_p_ = new Grace_align_item;
  46   // needed  for setting font size.
  47   announce_element (Score_element_info (align_item_p_, 0));
  48 }
  49
  50 void
  51 Align_note_column_engraver::do_removal_processing ()
  52 {
  53   Scalar al = get_property ("graceAlignPosition", 0);
  54   if (al.isdir_b ())
  55     {
  56       align_item_p_->notehead_align_dir_ = Direction (int (al));
  57     }
  58
  59   typeset_element (align_item_p_);
  60   align_item_p_ =0;
  61 }
  62
  63 void
  64 Align_note_column_engraver::acknowledge_element (Score_element_info inf)
  65 {
  66   if (Note_column * n = dynamic_cast<Note_column*> (inf.elem_l_))
  67     {
  68       now_column_l_ =n;
  69     }
  70   else if (Local_key_item * it = dynamic_cast<Local_key_item*> (inf.elem_l_))
  71     {
  72       accidental_l_ = it;
  73     }
  74 }
  75 void
  76 Align_note_column_engraver::process_acknowledged ()
  77 {
  78   if (now_column_l_ && accidental_l_)
  79     {
  80
  81       /* Can't inspect  width of Local_key_item, since
  82
  83          A. it may not be fully built
  84
  85          B. it has no pscore_l_ field.
  86
  87       */
  88       Scalar grsp = get_property ("graceAccidentalSpace", 0);
  89       if (grsp.isnum_b ())
  90         {
  91           Real extra_space = double(grsp);
  92           SCM e = gh_cons (gh_double2scm (-extra_space), gh_double2scm (0.0));
  93           now_column_l_->set_elt_property (extra_space_scm_sym, e);
  94         }
  95     }
  96
  97   if (now_column_l_)
  98     {
  99       align_item_p_->add_element (now_column_l_);
 100       now_column_l_ =0;
 101     }
 102 }
 103
 104 void
 105 Align_note_column_engraver::do_post_move_processing ()
 106 {
 107   now_column_l_ =0;
 108   accidental_l_ =0;
 109 }
 110
 111 ADD_THIS_TRANSLATOR(Align_note_column_engraver);