2 span-bar.cc -- implement Span_bar
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "dimensions.hh"
12 #include "paper-def.hh"
13 #include "molecule.hh"
15 #include "axis-group-interface.hh"
16 #include "group-interface.hh"
17 #include "score-element.hh"
21 Span_bar::add_bar (Score_element*me, Score_element*b)
23 Pointer_group_interface gi (me);
26 me->add_dependency (b);
30 Span_bar::width_callback (Score_element *se, Axis )
32 String gl = ly_scm2string (se->get_elt_property ("glyph"));
37 Molecule m = Bar::compound_barline (se, gl, 40 PT);
39 return m.extent (X_AXIS);
42 MAKE_SCHEME_CALLBACK(Span_bar,before_line_breaking);
44 Span_bar::before_line_breaking (SCM smob)
46 Bar::before_line_breaking (smob);
48 evaluate_empty (unsmob_element (smob));
50 return SCM_UNSPECIFIED;
54 Span_bar::center_on_spanned_callback (Score_element * me, Axis a)
57 Interval i (get_spanned_interval (me));
60 Bar::brew_molecule delivers a barline of y-extent (-h/2,h/2), so
61 we have to translate ourselves to be in the center of the
62 interval that we span. */
68 Span_bar::evaluate_empty (Score_element*me)
71 TODO: filter all hara-kiried out of ELEMENS list, and then
72 optionally do suicide. Call this cleanage function from
73 center_on_spanned_callback() as well.
76 if (!gh_pair_p (me->get_elt_property ("elements")))
81 SCM gl = me->get_elt_property ("glyph");
82 if (!gh_string_p (gl))
88 String type_str = ly_scm2string (gl);
89 String orig = type_str;
94 else if (type_str== ":|")
98 else if (type_str== ":|:")
102 if (orig != type_str)
103 me->set_elt_property ("glyph", ly_str02scm (type_str.ch_C()));
108 Span_bar::get_spanned_interval (Score_element*me)
110 return Axis_group_interface::group_extent_callback (me, Y_AXIS);
114 MAKE_SCHEME_CALLBACK(Span_bar,get_bar_size);
116 Span_bar::get_bar_size (SCM smob)
118 Score_element* me = unsmob_element (smob);
119 Interval iv (get_spanned_interval (me));
123 This happens if the bars are hara-kiried from under us.
126 return gh_double2scm (-1);
128 return gh_double2scm (iv.length ());
131 Span_bar::set_interface (Score_element *me)
133 Bar::set_interface (me);
135 Pointer_group_interface(me).set_interface ();
136 me->set_extent_callback (width_callback, X_AXIS);
137 me->add_offset_callback (center_on_spanned_callback, Y_AXIS);
138 me->set_interface (ly_symbol2scm ("span-bar-interface"));
139 me->set_extent_callback (0, Y_AXIS);
143 Span_bar::has_interface (Score_element*m)
145 return m && m->has_interface (ly_symbol2scm ("span-bar-interface"));