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--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "engraver.hh"
  11 #include "grace-align-item.hh"
  12 #include "align-interface.hh"
  13 #include "note-column.hh"
  14 #include "warn.hh"
  15 #include "directional-element-interface.hh"
  16 #include "side-position-interface.hh"
  17 #include "local-key-item.hh"
  18
  19 /**
  20    Catch notes, and put them in a row. Used for aligning grace notes.
  21  */
  22 class Align_note_column_engraver: public Engraver
  23 {
  24   Item * align_item_p_;
  25   Note_column * now_column_l_;
  26   Score_element * accidental_l_;
  27
  28   virtual void process_acknowledged ();
  29   virtual void do_post_move_processing ();
  30   virtual void do_creation_processing ();
  31   virtual void do_removal_processing ();
  32   virtual void acknowledge_element (Score_element_info);
  33 public:
  34   VIRTUAL_COPY_CONS(Translator);
  35   Align_note_column_engraver ();
  36 };
  37
  38 Align_note_column_engraver::Align_note_column_engraver()
  39 {
  40   align_item_p_ =0;
  41   now_column_l_ =0;
  42   accidental_l_ =0;
  43 }
  44
  45 void
  46 Align_note_column_engraver::do_creation_processing ()
  47 {
  48   align_item_p_ = new Item (get_property ("basicGraceAlignItemProperties"));
  49   Grace_align_item::set_interface (align_item_p_);
  50   Side_position::set_axis (align_item_p_, X_AXIS);
  51   Side_position::set_direction (align_item_p_, LEFT);
  52
  53   // needed  for setting font size.
  54   announce_element (Score_element_info (align_item_p_, 0));
  55 }
  56
  57 void
  58 Align_note_column_engraver::do_removal_processing ()
  59 {
  60   SCM al = get_property ("graceAlignPosition");
  61   if (isdir_b (al))
  62     {
  63       Direction d = to_dir (al);
  64       Directional_element_interface (align_item_p_).set (d);
  65     }
  66
  67   typeset_element (align_item_p_);
  68   align_item_p_ =0;
  69 }
  70
  71 void
  72 Align_note_column_engraver::acknowledge_element (Score_element_info inf)
  73 {
  74   if (Note_column * n = dynamic_cast<Note_column*> (inf.elem_l_))
  75     {
  76       now_column_l_ =n;
  77     }
  78   else if (Local_key_item::has_interface (inf.elem_l_))
  79     {
  80       accidental_l_ = inf.elem_l_;
  81     }
  82 }
  83 void
  84 Align_note_column_engraver::process_acknowledged ()
  85 {
  86   if (now_column_l_ && accidental_l_)
  87     {
  88
  89       /* Can't inspect  width of Local_key_item, since
  90
  91          A. it may not be fully built
  92
  93          B. it has no pscore_l_ field.
  94
  95       */
  96       SCM grsp = get_property ("graceAccidentalSpace");
  97       if (gh_number_p(grsp))
  98         {
  99           /*
 100             ugh.
 101           */
 102           Real extra_space = gh_scm2double(grsp);
 103           SCM e = gh_cons (gh_double2scm (-extra_space), gh_double2scm (0.0));
 104           now_column_l_->set_elt_property ("extra-space", e);
 105         }
 106     }
 107
 108   if (now_column_l_)
 109     {
 110       Align_interface::add_element (align_item_p_,now_column_l_);
 111       now_column_l_ =0;
 112     }
 113 }
 114
 115 void
 116 Align_note_column_engraver::do_post_move_processing ()
 117 {
 118   now_column_l_ =0;
 119   accidental_l_ =0;
 120 }
 121
 122 ADD_THIS_TRANSLATOR(Align_note_column_engraver);
 123