release: 1.5.24

[lilypond.git] / lily / item.cc

diff --git a/lily/item.cc b/lily/item.cc
index e653c46ac6dfdd74387abe4f260323a3eb9914e2..4447f3f64f542fb0654e9ac3c5a4ba89482d2123 100644 (file)
--- a/lily/item.cc
+++ b/lily/item.cc
@@ -1,18 +1,188 @@
+/*
+  item.cc -- implement Item
+
+  source file of the GNU LilyPond music typesetter
+
+  (c)  1997--2001 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)
+  : Grob (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)
+  : 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))
+    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"));
+}
 
-Item::Item()
+Paper_column *
+Item::column_l () const
 {
-    pcol_l_ = 0;
+  Item *parent = dynamic_cast<Item*> (get_parent (X_AXIS));
+  return parent ? parent->column_l () : 0;
 }
 
+Line_of_score *
+Item::line_l () const
+{
+  Grob *g = get_parent (X_AXIS);
+  return g ?  g->line_l () : 0;
+}
+
+
 void
-Item::do_print() const
+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
 {
-#ifndef NPRINT
-    mtor << "(unknown)";
-#endif
+  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 (Line_of_score*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_)
+    {
+      mutable_property_alist_
+       = handle_broken_grobs(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_grob_property ("visibility-lambda");
+  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_callback (SCM_EOL, X_AXIS);
+         set_extent_callback (SCM_EOL, Y_AXIS);
+       }
+      else if (trans)
+       set_grob_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;
+}