source file of the GNU LilyPond music typesetter
- (c) 1997, 1998, 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
Jan Nieuwenhuizen <janneke@gnu.org>
*/
+#include "bar-line.hh"
#include "score-engraver.hh"
-#include "bar-engraver.hh"
-#include "staff-bar.hh"
-#include "musical-request.hh"
-#include "multi-measure-rest.hh"
-#include "command-request.hh"
-#include "timing-engraver.hh"
+#include "event.hh"
#include "engraver-group-engraver.hh"
#include "warn.hh"
+#include "item.hh"
+#include "engraver.hh"
-Bar_engraver::Bar_engraver()
+/*
+ generate bars. Either user ("|:"), or default (new measure)
+
+ */
+class Bar_engraver : public Engraver
{
- bar_p_ =0;
- do_post_move_processing();
+public:
+ TRANSLATOR_DECLARATIONS( Bar_engraver );
+ void request_bar (String type_string);
+
+protected:
+ virtual void finalize ();
+ virtual void stop_translation_timestep ();
+ virtual void process_acknowledged_grobs ();
+
+private:
+ void typeset_bar ();
+ void create_bar ();
+
+ Item * bar_;
+};
+
+Bar_engraver::Bar_engraver ()
+{
+ bar_ =0;
}
-
-
-
void
Bar_engraver::create_bar ()
{
- if (!bar_p_)
+ if (!bar_)
{
- bar_p_ = new Staff_bar;
- bar_p_->set_elt_property ("break-aligned", SCM_BOOL_T);
-
- // urg: "" != empty...
- SCM default_type = get_property ("defaultBarType", 0);
- if (gh_string_p (default_type))
- {
- bar_p_->set_elt_property ("glyph", default_type); // gu.h
- }
-
-#if 0
- /*
- urg. Why did I implement this? And did I implement this so
- clumsily? */
- SCM prop = get_property ("barAtLineStart", 0);
- if (to_boolean (prop))
- {
- bar_p_->set_elt_property ("at-line-start", SCM_BOOL_T);
- }
-#endif
- announce_element (Score_element_info (bar_p_, 0));
+ bar_ = make_item ("BarLine");
+ SCM gl = get_property ("whichBar");
+ if (scm_equal_p (gl, bar_->get_grob_property ("glyph")) != SCM_BOOL_T)
+ bar_->set_grob_property ("glyph", gl);
+
+ announce_grob(bar_, SCM_EOL);
}
}
-/**
- Make a barline. If there are both |: and :| requested, merge them
- to :|:.
-
-*/
void
-Bar_engraver::request_bar (String requested_type)
+Bar_engraver::finalize ()
{
- if (!now_mom ())
- {
- SCM prop = get_property ("barAtLineStart", 0);
- if (!to_boolean (prop))
- return;
- }
- bool bar_existed = bar_p_;
- create_bar ();
- if (bar_existed && requested_type == "")
- {
- return;
- }
-
- String current = ly_scm2string (bar_p_->get_elt_property ("glyph"));
-
- if ((requested_type == "|:" && current== ":|")
- || (requested_type == ":|" && current == "|:"))
- requested_type = ":|:";
-
-
- bar_p_->set_elt_property ("glyph",
- ly_str02scm (requested_type.ch_C ()));
+ typeset_bar ();
}
-void
-Bar_engraver::do_creation_processing ()
-{
-}
+/*
+ Bar_engraver should come *after* any engravers that
+ modify whichBar
+
+ This is a little hairy : whichBar may be set by
+ Repeat_acknowledge_engraver::process_music, which is at score
+ context. This means that grobs could should be created after
+ process_music. We do stuff process_acknowledged_grobs(), just to be
+ on the safe side.
+
+*/
void
-Bar_engraver::do_removal_processing ()
+Bar_engraver::process_acknowledged_grobs ()
{
- if (bar_p_)
+ if (!bar_ && gh_string_p (get_property ("whichBar")))
{
- typeset_element (bar_p_);
- bar_p_ =0;
+ create_bar ();
}
}
void
-Bar_engraver::do_process_requests()
-{
- Translator * t = daddy_grav_l ()->get_simple_translator ("Timing_engraver");
-
- Timing_engraver * te = dynamic_cast<Timing_engraver*>(t);
- String which = (te) ? te->which_bar () : "";
-
- if (which.length_i ())
- {
- create_bar();
- bar_p_->set_elt_property ("glyph", ly_str02scm (which.ch_C ()));
- }
-
- if (!bar_p_)
+Bar_engraver::typeset_bar ()
+{
+ if (bar_)
{
- Score_engraver * e = 0;
- Translator * t = daddy_grav_l ();
- for (; !e && t; t = t->daddy_trans_l_)
- {
- e = dynamic_cast<Score_engraver*> (t);
- }
-
- if (!e)
- programming_error ("No score engraver!");
- else
- e->forbid_breaks ();
+ typeset_grob (bar_);
+ bar_ =0;
}
}
-
+/*
+ lines may only be broken if there is a barline in all staves
+*/
void
-Bar_engraver::do_pre_move_processing()
+Bar_engraver::stop_translation_timestep ()
{
- if (bar_p_)
+ if (!bar_)
{
- typeset_element (bar_p_);
- bar_p_ =0;
+ top_engraver ()->forbid_breaks (); // guh. Use properties!
}
+ else
+ typeset_bar ();
}
-ADD_THIS_TRANSLATOR(Bar_engraver);
-
-
+ENTER_DESCRIPTION(Bar_engraver,
+/* descr */ "Create barlines. This engraver is controlled through the "
+"@code{whichBar} property. If it has no bar line to create, it will forbid a linebreak at this point",
+/* creats*/ "BarLine",
+/* accepts */ "",
+/* acks */ "",
+/* reads */ "whichBar",
+/* write */ "");