lily/bar-script-engraver.cc

   1 /*
   2   bar-script-engraver.cc --  implement Bar_script_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 "bar-script-engraver.hh"
  11 #include "bar.hh"
  12 #include "clef-item.hh"
  13 #include "side-position-interface.hh"
  14 #include "text-item.hh"
  15 #include "lily-guile.hh"
  16 #include "paper-column.hh"
  17 #include "paper-def.hh"
  18 #include "dimension-cache.hh"
  19 #include "staff-symbol-referencer.hh"
  20 #include "side-position-interface.hh"
  21 #include "staff-symbol.hh"
  22
  23 Bar_script_engraver::Bar_script_engraver ()
  24 {
  25   axis_ = Y_AXIS;
  26   text_p_ =0;
  27 }
  28
  29 void
  30 Bar_script_engraver::do_creation_processing ()
  31 {
  32   String t = type_  + "VisibilityFunction";
  33   SCM proc = get_property (t);
  34
  35   if (gh_procedure_p (proc))
  36       visibility_lambda_ = proc;
  37 }
  38
  39
  40 /*
  41   Some interesting item came across.  Lets attach the text and the
  42   positioner to the item.
  43
  44 */
  45
  46 void
  47 Bar_script_engraver::attach_script_to_item (Item *i)
  48 {
  49   Axis other_axis = Axis((axis_ + 1)%2);
  50   if (text_p_ && !text_p_->parent_l(other_axis))
  51     {
  52       text_p_->set_parent (i,other_axis);
  53       text_p_->set_parent (i,axis_);
  54
  55       if (!text_p_->parent_l(other_axis))
  56         text_p_->set_parent (i,other_axis);
  57
  58       Side_position_interface (text_p_).add_support (i);
  59
  60       /*
  61         How do we make sure that text_p_ has a dependency from
  62         someone else? We can't use I for that,  so we use some other element.
  63        */
  64       // text_p_->set_elt_property ("dangling", SCM_BOOL_T)
  65       get_staff_info ().command_pcol_l ()->add_dependency (text_p_);
  66     }
  67 }
  68
  69 /*
  70   URG.
  71  */
  72 Item*
  73 Bar_script_engraver::cast_to_interesting_item (Score_element *e)
  74 {
  75   Item * i =0;
  76
  77   /*
  78     should do type lookup: if (e ->is_type (hang_on_type))
  79    */
  80   i = dynamic_cast<Bar*> (e);
  81
  82   return i;
  83 }
  84
  85 void
  86 Bar_script_engraver::acknowledge_element (Score_element_info inf)
  87 {
  88   if (inf.origin_trans_l_arr (this).size () == 1)
  89     {
  90       Item *i=cast_to_interesting_item (inf.elem_l_);
  91       if (!i)
  92         return;
  93
  94       /* Only put numbers on bars that are at our own level (don't put
  95          numbers over the staffs of a GrandStaff, only over the GrandStaff
  96          itself */
  97       if (inf.origin_trans_l_arr (this).size () != 1)
  98         return;
  99
 100       attach_script_to_item (i);
 101     }
 102 }
 103
 104 void
 105 Bar_script_engraver::do_pre_move_processing ()
 106 {
 107   if (text_p_)
 108     {
 109       Staff_symbol * st = staff_symbol_referencer (text_p_).staff_symbol_l();
 110
 111       if (st)
 112         side_position (text_p_).add_support (st);
 113
 114       typeset_element (text_p_);
 115       text_p_ =0;
 116     }
 117 }
 118
 119
 120 void
 121 Bar_script_engraver::create_items (Request *rq)
 122 {
 123   if (text_p_)
 124     return;
 125
 126   text_p_ = new Text_item;
 127   text_p_->set_elt_property ("breakable", SCM_BOOL_T); // ugh
 128   Side_position_interface staffside(text_p_);
 129   staffside.set_axis (axis_);
 130
 131   SCM prop = get_property (type_ + "Direction");
 132   if (!isdir_b (prop))
 133     {
 134       prop = gh_int2scm (UP);
 135     }
 136   text_p_->set_elt_property ("direction", prop);
 137
 138   SCM padding = get_property (type_ + "ScriptPadding");
 139   if (gh_number_p(padding))
 140     {
 141       text_p_->set_elt_property ("padding", padding);
 142     }
 143   else
 144     {
 145       text_p_
 146         ->set_elt_property ("padding",
 147                             gh_double2scm(paper_l ()->get_var ("interline")));
 148     }
 149
 150   if (gh_procedure_p (visibility_lambda_))
 151       text_p_->set_elt_property ("visibility-lambda",
 152                                  visibility_lambda_);
 153
 154   announce_element (Score_element_info (text_p_, rq));
 155 }
 156