+/*
+ item.cc -- implement Item
+
+ source file of the GNU LilyPond music typesetter
+
+ (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+*/
+
+
+#include "paper-score.hh"
#include "debug.hh"
#include "item.hh"
+#include "paper-column.hh"
+#include "spanner.hh"
+#include "lily-guile.hh"
+#include "line-of-score.hh"
+
+Item::Item (SCM s)
+ : Score_element (s)
+{
+ broken_to_drul_[LEFT] = broken_to_drul_[RIGHT]=0;
+}
+
+/**
+ Item copy ctor. Copy nothing: everything should be a elt property
+ or a special purpose pointer (such as broken_to_drul_[]) */
+Item::Item (Item const &s)
+ : Score_element (s)
+{
+ broken_to_drul_[LEFT] = broken_to_drul_[RIGHT] =0;
+}
+
+
+bool
+Item::breakable_b (Score_element*me)
+{
+ if (me->original_l_)
+ return false;
+
+ if (!dynamic_cast<Item*>(me))
+ programming_error ("only items can be breakable.");
+
+ Item * i =dynamic_cast<Item*> (me->parent_l (X_AXIS));
+ return (i) ? Item::breakable_b (i) : to_boolean (me->get_elt_property ("breakable"));
+}
+
+Paper_column *
+Item::column_l () const
+{
+ return dynamic_cast<Item*> (parent_l (X_AXIS))->column_l ();
+}
+
+Line_of_score *
+Item::line_l() const
+{
+ Score_element *g = parent_l (X_AXIS);
+ return g ? g->line_l () : 0;
+}
+
+
+void
+Item::copy_breakable_items()
+{
+ Drul_array<Item *> new_copies;
+ Direction i=LEFT;
+ do
+ {
+ Score_element * dolly = clone();
+ Item * item_p = dynamic_cast<Item*>(dolly);
+ pscore_l_->line_l_->typeset_element (item_p);
+ new_copies[i] =item_p;
+ }
+ while (flip(&i) != LEFT);
+ broken_to_drul_= new_copies;
+}
+
+
+bool
+Item::broken_b () const
+{
+ return broken_to_drul_[LEFT] || broken_to_drul_[RIGHT];
+}
+
+
+/*
+ Generate items for begin and end-of line.
+ */
+void
+Item::discretionary_processing()
+{
+ if (broken_b ())
+ return;
+
+ if (Item::breakable_b (this))
+ copy_breakable_items();
+}
+Score_element*
+Item::find_broken_piece (Line_of_score*l) const
+{
+ if (line_l() == l)
+ return (Item*)(this);
+
+ Direction d = LEFT;
+ do {
+ Score_element *s = broken_to_drul_[d];
+ if (s && s->line_l () == l)
+ return s;
+ }
+ while (flip (&d) != LEFT);
+
+ return 0;
+}
-Item::Item()
+Item*
+Item::find_prebroken_piece (Direction d) const
{
- pcol_l_ = 0;
+ Item * me = (Item *) (this);
+ if (!d)
+ return me;
+ return dynamic_cast<Item*> (broken_to_drul_[d]);
}
-IMPLEMENT_STATIC_NAME(Item);
+
+Direction
+Item::break_status_dir () const
+{
+ if (original_l_)
+ {
+ Item * i = dynamic_cast<Item*> (original_l_);
+
+ return (i->broken_to_drul_[LEFT] == this) ? LEFT : RIGHT;
+ }
+ else
+ return CENTER;
+}
void
-Item::do_print() const
+Item::handle_prebroken_dependencies ()
{
-#ifndef NPRINT
- mtor << "(unknown)";
-#endif
+ if (original_l_)
+ {
+ mutable_property_alist_
+ = handle_broken_smobs (original_l_->mutable_property_alist_,
+ gh_int2scm (break_status_dir ()));
+ }
+
+ /*
+ Can't do this earlier, because try_visibility_lambda () might set
+ the elt property transparent, which would then be copied.
+
+ TODO:
+
+ handle visibility-lambda the item itself iso. breakstatusdir, so
+ the function can do more complicated things.
+
+ */
+ SCM vis = get_elt_property ("visibility-lambda");
+ if (gh_procedure_p (vis))
+ {
+ SCM args = scm_listify (gh_int2scm (break_status_dir ()), SCM_UNDEFINED);
+ SCM result = gh_apply (vis, args);
+ bool trans = gh_scm2bool (gh_car (result));
+ bool empty = gh_scm2bool (gh_cdr (result));
+
+ if (empty && trans)
+ suicide ();
+ else if (empty)
+ {
+ set_extent_callback (SCM_EOL, X_AXIS);
+ set_extent_callback (SCM_EOL, Y_AXIS);
+ }
+ else if (trans)
+ set_elt_property ("molecule-callback", SCM_BOOL_T);
+ }
}
+SCM
+Item::do_derived_mark ()
+{
+ if (broken_to_drul_[LEFT])
+ scm_gc_mark (broken_to_drul_[LEFT]->self_scm ());
+ if (broken_to_drul_[RIGHT])
+ scm_gc_mark (broken_to_drul_[RIGHT]->self_scm ());
+ return SCM_EOL;
+}