lily/break-align-engraver.cc

   1 /*
   2   break-align-engraver.cc --  implement Break_align_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 #include "engraver.hh"
  10 #include "protected-scm.hh"
  11 #include "break-align-item.hh"
  12 #include "axis-group-item.hh"
  13
  14 class Break_align_engraver : public Engraver
  15 {
  16   Break_align_item *align_l_;
  17   Protected_scm column_alist_;
  18 protected:
  19   virtual void acknowledge_element(Score_element_info i);
  20   virtual void do_pre_move_processing ();
  21   void add_column (SCM);
  22
  23 public:
  24   VIRTUAL_COPY_CONS(Translator);
  25   Break_align_engraver ();
  26 };
  27
  28
  29
  30 ADD_THIS_TRANSLATOR(Break_align_engraver);
  31
  32 void
  33 Break_align_engraver::add_column (SCM smob)
  34 {
  35   Score_element * e = unsmob_element (smob);
  36   align_l_->add_element (e);
  37   typeset_element (e);
  38 }
  39
  40 void
  41 Break_align_engraver::do_pre_move_processing ()
  42 {
  43   SCM order = get_property ("breakAlignOrder", 0);
  44   for (; gh_pair_p (order); order = gh_cdr (order))
  45     {
  46       SCM p = scm_assoc ( gh_car (order), column_alist_);
  47       if (gh_pair_p (p))
  48         {
  49           add_column (gh_cdr (p));
  50           column_alist_ = scm_assoc_remove_x (column_alist_, gh_car (order));
  51         }
  52     }
  53
  54   for (SCM p = column_alist_; gh_pair_p (p); p = gh_cdr (p))
  55     {
  56       SCM pair = gh_car (p);
  57       add_column (gh_cdr (pair));
  58     }
  59
  60
  61   column_alist_ = SCM_EOL;
  62
  63   if (align_l_)
  64     {
  65       typeset_element (align_l_);
  66       align_l_ = 0;
  67     }
  68 }
  69
  70
  71 Break_align_engraver::Break_align_engraver ()
  72 {
  73   column_alist_ = SCM_EOL;
  74   align_l_ =0;
  75 }
  76
  77 void
  78 Break_align_engraver::acknowledge_element (Score_element_info inf)
  79 {
  80   if (Item * item_l = dynamic_cast <Item *> (inf.elem_l_))
  81     {
  82       if (item_l->empty_b (X_AXIS) || item_l->parent_l (X_AXIS))
  83         return;
  84
  85       SCM bp=item_l->remove_elt_property ("breakable");
  86       bool breakable = (gh_boolean_p  (bp) && gh_scm2bool (bp));
  87       if (!breakable)
  88         return ;
  89
  90       SCM al = item_l->remove_elt_property ("break-aligned");
  91       if (!gh_boolean_p (al ) || !gh_scm2bool (al))
  92         return ;
  93
  94
  95       if (!align_l_)
  96         {
  97           align_l_ = new Break_align_item;
  98           align_l_->set_elt_property ("breakable", SCM_BOOL_T);
  99           announce_element (Score_element_info (align_l_,0));
 100         }
 101
 102       SCM name = ly_str02scm (inf.elem_l_->name());
 103       SCM s = scm_assoc (name, column_alist_);
 104
 105       Axis_group_item * group = 0;
 106       if (s != SCM_BOOL_F)
 107         {
 108           Score_element *e =  unsmob_element (gh_cdr(s));
 109           group = dynamic_cast<Axis_group_item*> (e);
 110         }
 111       else
 112         {
 113           group = new Axis_group_item;
 114           group->set_axes (X_AXIS,X_AXIS);
 115           group->set_elt_property ("origin", name);
 116           group->set_parent (align_l_, Y_AXIS);
 117           announce_element (Score_element_info (group, 0));
 118           column_alist_ = scm_assoc_set_x (column_alist_, name, group->self_scm_);
 119         }
 120       group->add_element (item_l);
 121     }
 122 }