2 hara-kiri-vertical-group-spanner.cc -- implement Hara_kiri_group_spanner
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2005 Jan Nieuwenhuizen <janneke@gnu.org>
7 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "hara-kiri-group-spanner.hh"
12 #include "paper-column.hh"
13 #include "pointer-group-interface.hh"
14 #include "axis-group-interface.hh"
19 MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner, y_extent, 2);
21 Hara_kiri_group_spanner::y_extent (SCM element_smob, SCM scm_axis)
23 Grob *me = unsmob_grob (element_smob);
26 assert (scm_to_int (scm_axis) == Y_AXIS);
27 consider_suicide (me);
28 return Axis_group_interface::group_extent_callback (me->self_scm (), scm_axis);
32 Hara_kiri_group_spanner::consider_suicide (Grob *me)
34 Spanner *sp = dynamic_cast<Spanner *> (me);
36 extract_grob_set (me, "items-worth-living", worth);
40 bool remove_first = to_boolean (me->get_property ("remove-first"));
42 && ((sp->original_ && broken_spanner_index (sp) == 0)
43 || Paper_column::get_rank (sp->get_bound (LEFT)->get_column ())
47 Link_array<Grob> childs;
48 Axis_group_interface::get_children (me, &childs);
49 for (int i = 0; i < childs.size (); i++)
50 childs[i]->suicide ();
53 very appropriate name here :-)
59 We can't rely on offsets and dimensions of elements in a hara-kiri
60 group. Use a callback to make sure that hara-kiri has been done
61 before asking for offsets. */
62 MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner, force_hara_kiri_callback, 2);
64 Hara_kiri_group_spanner::force_hara_kiri_callback (SCM element_smob, SCM axis)
66 Grob *me = unsmob_grob (element_smob);
69 assert (scm_to_int (axis) == Y_AXIS);
70 consider_suicide (me);
71 return scm_from_double (0.0);
74 MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner, force_hara_kiri_in_parent_callback, 2);
76 Hara_kiri_group_spanner::force_hara_kiri_in_parent_callback (SCM element_smob, SCM axis)
78 Grob *daughter = unsmob_grob (element_smob);
79 Axis a = (Axis) scm_to_int (axis);
81 force_hara_kiri_callback (daughter->get_parent (a)->self_scm (), axis);
82 return scm_from_double (0.0);
86 Hara_kiri_group_spanner::add_element (Grob *me, Grob *e)
88 // e->add_offset_callback (force_hara_kiri_in_parent_callback, Y_AXIS);
89 Axis_group_interface::add_element (me, e);
93 Hara_kiri_group_spanner::add_interesting_item (Grob *me, Grob *n)
95 me->add_dependency (n);
96 Pointer_group_interface::add_grob (me, ly_symbol2scm ("items-worth-living"), n);
99 ADD_INTERFACE (Hara_kiri_group_spanner, "hara-kiri-group-interface",
100 "A group spanner that keeps track of interesting items. If it "
101 "doesn't contain any after linebreaking, then it "
102 "will remove itself and all its children.",
103 "items-worth-living remove-first");