lily/hara-kiri-group-spanner.cc

   1 /*
   2   hara-kiri-vertical-group-spanner.cc -- implement Hara_kiri_group_spanner
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1998--2001 Jan Nieuwenhuizen <janneke@gnu.org>
   7   Han-Wen Nienhuys <hanwen@cs.uu.nl>
   8 */
   9
  10 #include "axis-group-interface.hh"
  11 #include "spanner.hh"
  12 #include "hara-kiri-group-spanner.hh"
  13 #include "debug.hh"
  14 #include "item.hh"
  15
  16
  17 MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner,y_extent,2);
  18 SCM
  19 Hara_kiri_group_spanner::y_extent (SCM element_smob, SCM scm_axis)
  20 {
  21   Grob *me = unsmob_grob (element_smob);
  22   Axis a = (Axis) gh_scm2int (scm_axis);
  23
  24   assert (a == Y_AXIS);
  25   consider_suicide (me);
  26   return  Axis_group_interface::group_extent_callback (me->self_scm (), scm_axis);
  27 }
  28
  29
  30 void
  31 Hara_kiri_group_spanner::consider_suicide (Grob*me)
  32 {
  33   SCM worth = me->get_grob_property ("items-worth-living");
  34   if (gh_pair_p (worth))
  35     return ;
  36
  37   Link_array<Grob> childs = Axis_group_interface::get_children (me);
  38   for (int i = 0; i < childs.size (); i++)
  39     childs[i]->suicide ();
  40
  41
  42   /*
  43     very appropriate name here :-)
  44    */
  45   me->suicide ();
  46 }
  47
  48
  49
  50 /*
  51   We can't rely on offsets and dimensions of elements in a hara-kiri
  52   group. Use a callback to make sure that hara-kiri has been done
  53   before asking for offsets.  */
  54 MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner,force_hara_kiri_callback,2);
  55 SCM
  56 Hara_kiri_group_spanner::force_hara_kiri_callback (SCM element_smob, SCM axis)
  57 {
  58   Grob *me = unsmob_grob (element_smob);
  59   Axis a = (Axis) gh_scm2int (axis);
  60   assert (a == Y_AXIS);
  61   consider_suicide (me);
  62   return gh_double2scm (0.0);
  63 }
  64
  65
  66 MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner,force_hara_kiri_in_parent_callback,2);
  67 SCM
  68 Hara_kiri_group_spanner::force_hara_kiri_in_parent_callback (SCM element_smob, SCM axis)
  69 {
  70   Grob *daughter = unsmob_grob (element_smob);
  71   Axis a = (Axis) gh_scm2int (axis);
  72   assert (a == Y_AXIS);
  73   force_hara_kiri_callback (daughter->parent_l (a)->self_scm (), axis);
  74   return gh_double2scm (0.0);
  75 }
  76
  77 void
  78 Hara_kiri_group_spanner::add_element (Grob * me, Grob *e)
  79 {
  80   //  e->add_offset_callback (force_hara_kiri_in_parent_callback, Y_AXIS);
  81   Axis_group_interface::add_element (me, e);
  82 }
  83
  84
  85 void
  86 Hara_kiri_group_spanner::set_interface (Grob*me)
  87 {
  88   me->set_interface (ly_symbol2scm ("hara-kiri-group-interface"));
  89 }
  90
  91
  92 bool
  93 Hara_kiri_group_spanner::has_interface (Grob*me)
  94 {
  95   return me->has_interface (ly_symbol2scm ("hara-kiri-group-interface"));
  96 }
  97
  98 void
  99 Hara_kiri_group_spanner::add_interesting_item (Grob* me,Grob* n)
 100 {
 101   me->add_dependency (n);
 102   Pointer_group_interface::add_element (me, "items-worth-living",n);
 103 }