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/*
item.cc -- implement Item
source file of the GNU LilyPond music typesetter
(c) 1997--2002 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 "system.hh"
#include "group-interface.hh"
Item::Item (SCM s)
: Grob (s)
{
broken_to_drul_[LEFT] = broken_to_drul_[RIGHT]=0;
Group_interface::add_thing (this, ly_symbol2scm ("interfaces"), ly_symbol2scm ("item-interface"));
}
/**
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)
: Grob (s)
{
broken_to_drul_[LEFT] = broken_to_drul_[RIGHT] =0;
}
bool
Item::breakable_b (Grob*me)
{
if (me->original_l_)
return false;
if (!dynamic_cast<Item*> (me))
me->programming_error ("only items can be breakable.");
Item * i =dynamic_cast<Item*> (me->get_parent (X_AXIS));
return (i) ? Item::breakable_b (i) : to_boolean (me->get_grob_property ("breakable"));
}
Paper_column *
Item::column_l () const
{
Item *parent = dynamic_cast<Item*> (get_parent (X_AXIS));
return parent ? parent->column_l () : 0;
}
System *
Item::line_l () const
{
Grob *g = get_parent (X_AXIS);
return g ? g->line_l () : 0;
}
void
Item::copy_breakable_items ()
{
Drul_array<Item *> new_copies;
Direction i=LEFT;
do
{
Grob * dolly = clone ();
Item * item_p = dynamic_cast<Item*> (dolly);
pscore_l_->line_l_->typeset_grob (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 ();
}
Grob*
Item::find_broken_piece (System*l) const
{
if (line_l () == l)
return (Item*) (this);
Direction d = LEFT;
do {
Grob *s = broken_to_drul_[d];
if (s && s->line_l () == l)
return s;
}
while (flip (&d) != LEFT);
return 0;
}
Item*
Item::find_prebroken_piece (Direction d) const
{
Item * me = (Item *) (this);
if (!d)
return me;
return dynamic_cast<Item*> (broken_to_drul_[d]);
}
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::handle_prebroken_dependencies ()
{
if (original_l_)
{
set_break_subsititution (gh_int2scm (break_status_dir ()));
mutable_property_alist_ = do_break_substitution(original_l_->mutable_property_alist_);
}
/*
Can't do this earlier, because try_visibility_lambda () might set
the elt property transparent, which would then be copied.
TODO:
handle break-visibility the item itself iso. breakstatusdir, so
the function can do more complicated things.
*/
SCM vis = get_grob_property ("break-visibility");
if (gh_procedure_p (vis))
{
SCM args = scm_list_n (gh_int2scm (break_status_dir ()), SCM_UNDEFINED);
SCM result = gh_apply (vis, args);
bool trans = gh_scm2bool (ly_car (result));
bool empty = gh_scm2bool (ly_cdr (result));
if (empty && trans)
suicide ();
else if (empty)
{
set_extent (SCM_EOL, X_AXIS);
set_extent (SCM_EOL, Y_AXIS);
}
else if (trans)
set_grob_property ("molecule-callback", SCM_EOL);
}
}
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;
}
Item*
unsmob_item (SCM s )
{
return dynamic_cast<Item*> (unsmob_grob (s));
}
ADD_INTERFACE(Item,
"item-interface",
"",
"no-spacing-rods break-visibility breakable")
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