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 "pointer-group-interface.hh"
13 #include "axis-group-interface.hh"
18 MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner, y_extent, 2);
20 Hara_kiri_group_spanner::y_extent (SCM element_smob, SCM scm_axis)
22 Grob *me = unsmob_grob (element_smob);
25 assert (scm_to_int (scm_axis) == Y_AXIS);
26 consider_suicide (me);
27 return Axis_group_interface::group_extent_callback (me->self_scm (), scm_axis);
31 Hara_kiri_group_spanner::consider_suicide (Grob *me)
33 Spanner *sp = dynamic_cast<Spanner *> (me);
35 extract_grob_set (me, "items-worth-living", worth);
39 if (!to_boolean (me->get_property ("remove-first"))
40 && broken_spanner_index (sp) == 0)
43 Link_array<Grob> childs;
44 Axis_group_interface::get_children (me, &childs);
45 for (int i = 0; i < childs.size (); i++)
46 childs[i]->suicide ();
49 very appropriate name here :-)
55 We can't rely on offsets and dimensions of elements in a hara-kiri
56 group. Use a callback to make sure that hara-kiri has been done
57 before asking for offsets. */
58 MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner, force_hara_kiri_callback, 2);
60 Hara_kiri_group_spanner::force_hara_kiri_callback (SCM element_smob, SCM axis)
62 Grob *me = unsmob_grob (element_smob);
65 assert (scm_to_int (axis) == Y_AXIS);
66 consider_suicide (me);
67 return scm_from_double (0.0);
70 MAKE_SCHEME_CALLBACK (Hara_kiri_group_spanner, force_hara_kiri_in_parent_callback, 2);
72 Hara_kiri_group_spanner::force_hara_kiri_in_parent_callback (SCM element_smob, SCM axis)
74 Grob *daughter = unsmob_grob (element_smob);
75 Axis a = (Axis) scm_to_int (axis);
77 force_hara_kiri_callback (daughter->get_parent (a)->self_scm (), axis);
78 return scm_from_double (0.0);
82 Hara_kiri_group_spanner::add_element (Grob *me, Grob *e)
84 // e->add_offset_callback (force_hara_kiri_in_parent_callback, Y_AXIS);
85 Axis_group_interface::add_element (me, e);
89 Hara_kiri_group_spanner::add_interesting_item (Grob *me, Grob *n)
91 me->add_dependency (n);
92 Pointer_group_interface::add_grob (me, ly_symbol2scm ("items-worth-living"), n);
95 ADD_INTERFACE (Hara_kiri_group_spanner, "hara-kiri-group-interface",
96 "A group spanner that keeps track of interesting items. If it "
97 "doesn't contain any after linebreaking, then it "
98 "will remove itself and all its children.",
99 "items-worth-living remove-first");