2 paper-column.cc -- implement Paper_column
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "paper-column.hh"
11 #include "paper-score.hh"
13 #include "axis-group-interface.hh"
14 #include "spaceable-grob.hh"
15 #include "molecule.hh"
16 #include "text-item.hh"
18 #include "font-interface.hh"
24 ADD_INTERFACE (Paper_column, "paper-column-interface",
25 " Paper_columns form the top-most item parent. (The Paper_columns X
26 parent is System, which is a spanner.)
28 Paper_columns form the units for the spacing engine. They are
29 numbered, the first (leftmost) is column 0. Numbering happens before
30 line-breaking, and columns are not renumbered after line breaking.
32 Since many columns go unused, you should only use the rank field to
33 get ordering information. Two adjacent columns may have
36 Don't be confused by right-items: each spacing wish can also contain
37 a number of items, with which a spacing constraint may be kept. It's
38 a little baroque, but it might come in handy later on?
40 "between-cols between-system-string when bounded-by-me shortest-playing-duration shortest-starter-duration");
44 Paper_column::do_break_processing ()
46 Spaceable_grob::remove_interface (this);
47 Item::do_break_processing ();
51 Paper_column::rank_i (Grob*me)
53 return dynamic_cast<Paper_column*> (me)->rank_i_;
57 Paper_column::line_l () const
63 Paper_column::column_l () const
65 return (Paper_column*) (this);
68 Paper_column::Paper_column (SCM l)
76 Paper_column::when_mom (Grob*me)
78 SCM m = me->get_grob_property ("when");
80 if (unsmob_moment (m))
82 return *unsmob_moment (m);
88 Paper_column::musical_b (Grob *me)
90 SCM m = me->get_grob_property ("shortest-starter-duration");
92 if (unsmob_moment (m))
94 s = *unsmob_moment (m);
96 return s != Moment (0);
102 Paper_column::used_b (Grob*me)
104 return gh_pair_p (me->get_grob_property ("elements")) || Item::breakable_b (me)
105 || gh_pair_p (me->get_grob_property ("bounded-by-me"))
110 Print a vertical line and the rank number, to aid debugging.
113 MAKE_SCHEME_CALLBACK(Paper_column,brew_molecule,1);
115 Paper_column::brew_molecule (SCM p)
117 Grob *me = unsmob_grob (p);
119 String r = to_str (Paper_column::rank_i (me));
120 SCM properties = Font_interface::font_alist_chain (me);
122 Molecule t = Text_item::text2molecule (me, ly_str02scm (r.ch_C()),
124 t.align_to (X_AXIS, CENTER);
125 t.align_to (Y_AXIS, DOWN);
127 Molecule l = Lookup::filledbox (Box (Interval (-0.01, 0.01),
131 return t.smobbed_copy ();