2 span-bar-grav.cc -- implement Span_bar_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "lily-guile.hh"
11 #include "bar-line.hh"
13 #include "span-bar.hh"
14 #include "engraver.hh"
19 Make bars that span multiple "staves". Catch bars, and span a
20 Span_bar over them if we find more than 2 bars. Vertical alignment
21 of staves changes the appearance of spanbars. It is up to the
22 aligner (Vertical_align_engraver, in this case, to add extra
23 dependencies to the spanbars.
26 class Span_bar_engraver : public Engraver
29 Link_array<Item> bars_;
32 TRANSLATOR_DECLARATIONS (Span_bar_engraver);
34 virtual void acknowledge_grob (Grob_info);
35 virtual void stop_translation_timestep ();
38 Span_bar_engraver::Span_bar_engraver ()
44 Span_bar_engraver::acknowledge_grob (Grob_info i)
46 int depth = i.origin_contexts (this).size ();
47 if (depth && Bar_line::has_interface (i.grob_))
49 Item * it = dynamic_cast<Item*> (i.grob_);
52 if (bars_.size () >= 2 && !spanbar_)
54 spanbar_ = make_item ("SpanBar");
56 spanbar_->set_parent (bars_[0], X_AXIS);
57 announce_grob (spanbar_, SCM_EOL);
63 Span_bar_engraver::stop_translation_timestep ()
67 for (int i=0; i < bars_.size () ; i++)
68 Span_bar::add_bar (spanbar_,bars_[i]);
70 SCM vissym =ly_symbol2scm ("break-visibility");
71 SCM vis = bars_[0]->internal_get_property (vissym);
72 if (ly_c_equal_p (spanbar_->internal_get_property (vissym), vis))
73 spanbar_->internal_set_property (vissym, vis);
75 typeset_grob (spanbar_);
82 ENTER_DESCRIPTION (Span_bar_engraver,
83 /* descr */ "This engraver makes cross-staff barlines: It catches all normal "
84 "bar lines, and draws a single span-bar across them.",
85 /* creats*/ "SpanBar",
87 /* acks */ "bar-line-interface",