new file.

[lilypond.git] / lily / hara-kiri-group-spanner.cc

diff --git a/lily/hara-kiri-group-spanner.cc b/lily/hara-kiri-group-spanner.cc
index 125b686f370ab9b6dd5009a38b80c69922c94056..dba478e0a30e93f2a2b54f276b1c9f49ad65a277 100644 (file)
--- a/lily/hara-kiri-group-spanner.cc
+++ b/lily/hara-kiri-group-spanner.cc
@@ -3,7 +3,7 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1998--2000 Jan Nieuwenhuizen <janneke@gnu.org>
+  (c)  1998--2002 Jan Nieuwenhuizen <janneke@gnu.org>
   Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
 
@@ -13,28 +13,28 @@
 #include "debug.hh"
 #include "item.hh"
 
-void
-Hara_kiri_group_spanner::set_interface (Score_element*me)
-{
-  me->set_elt_pointer ("items-worth-living", SCM_EOL);
-}
 
-void 
-Hara_kiri_group_spanner::add_interesting_item (Score_element* me,Item* n)
+MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner,y_extent,2);
+SCM
+Hara_kiri_group_spanner::y_extent (SCM element_smob, SCM scm_axis)
 {
-  me->add_dependency (n);
-  Pointer_group_interface (me, "items-worth-living").add_element (n);
+  Grob *me = unsmob_grob (element_smob);
+  Axis a = (Axis) gh_scm2int (scm_axis);
 
+  assert (a == Y_AXIS);
+  consider_suicide (me);
+  return  Axis_group_interface::group_extent_callback (me->self_scm (), scm_axis);
 }
 
+
 void
-Hara_kiri_group_spanner::consider_suicide(Score_element*me)
+Hara_kiri_group_spanner::consider_suicide (Grob*me)
 {
-  SCM worth = me->get_elt_pointer ("items-worth-living");
+  SCM worth = me->get_grob_property ("items-worth-living");
   if (gh_pair_p (worth))
     return ;
 
-  Link_array<Score_element> childs = Axis_group_interface (me).get_children ();
+  Link_array<Grob> childs = Axis_group_interface::get_children (me);
   for (int i = 0; i < childs.size (); i++)
     childs[i]->suicide ();
 
@@ -51,17 +51,52 @@ Hara_kiri_group_spanner::consider_suicide(Score_element*me)
   We can't rely on offsets and dimensions of elements in a hara-kiri
   group. Use a callback to make sure that hara-kiri has been done
   before asking for offsets.  */
-Real
-Hara_kiri_group_spanner::force_hara_kiri_callback (Score_element *elt, Axis a)
+MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner,force_hara_kiri_callback,2);
+SCM
+Hara_kiri_group_spanner::force_hara_kiri_callback (SCM element_smob, SCM axis)
+{
+  Grob *me = unsmob_grob (element_smob);
+  Axis a = (Axis) gh_scm2int (axis);
+  assert (a == Y_AXIS);
+  consider_suicide (me);
+  return gh_double2scm (0.0);
+}
+
+
+MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner,force_hara_kiri_in_parent_callback,2);
+SCM
+Hara_kiri_group_spanner::force_hara_kiri_in_parent_callback (SCM element_smob, SCM axis)
+{
+  Grob *daughter = unsmob_grob (element_smob);
+  Axis a = (Axis) gh_scm2int (axis);
+  assert (a == Y_AXIS);
+  force_hara_kiri_callback (daughter->get_parent (a)->self_scm (), axis);
+  return gh_double2scm (0.0);
+}
+
+void
+Hara_kiri_group_spanner::add_element (Grob * me, Grob *e)
 {
-  while (elt
-        && to_boolean (elt->get_elt_property ("hara-kiri-interface")))
-    elt = elt->parent_l(a);
+  //  e->add_offset_callback (force_hara_kiri_in_parent_callback, Y_AXIS);
+  Axis_group_interface::add_element (me, e);
+}
+
+
+
 
-  if (elt)
-    {
-      Hara_kiri_group_spanner::consider_suicide (elt);
-    }
 
-  return 0.0;
+void 
+Hara_kiri_group_spanner::add_interesting_item (Grob* me,Grob* n)
+{
+  me->add_dependency (n);
+  Pointer_group_interface::add_grob (me, ly_symbol2scm ("items-worth-living"),n);
 }
+
+
+ADD_INTERFACE (Hara_kiri_group_spanner,"hara-kiri-group-interface",
+  "  As Vertical_group_spanner, but keep track of interesting items.  If
+we don't contain any interesting items after linebreaking, then
+gracefully commit suicide.  Objective: don't disgrace Lily by
+typesetting empty lines in orchestral scores.",
+  "items-worth-living");
+