release: 1.3.70

[lilypond.git] / lily / include / item.hh

diff --git a/lily/include/item.hh b/lily/include/item.hh
index 6f3eb6a7cb19740a0f668c5489d70397fa1dbb62..16f298f7f2361983d612975fcd699d3e6dfff2d2 100644 (file)
--- a/lily/include/item.hh
+++ b/lily/include/item.hh
@@ -3,18 +3,20 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
+  (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
 #ifndef ITEM_HH
 #define ITEM_HH
 
-#include "glob.hh"
-#include "boxes.hh"
+
+#include "box.hh"
 #include "string.hh"
-#include "score-elem.hh"
+#include "score-element.hh"
+#include "drul-array.hh"
+#include "protected-scm.hh"
 
 /**
- a horizontally fixed size element of the score
+  A horizontally fixed size element of the score.
 
   Item is the datastructure for printables whose width is known
   before the spacing is calculated
@@ -22,29 +24,39 @@
   NB. This doesn't mean an Item has to initialize the output field before
   spacing calculation. 
   
-*/
-class Item : public virtual Score_elem {
+  
+  Element properties
+  
+  visibility-lambda -- a function that takes the break
+  direction and returns a (transparent, empty) cons
+
+  breakable -- boolean indicating if this is a breakable item (clef,
+  barline, key sig, etc.)
+
+   */
+class Item : public Score_element
+{
+  Drul_array<Item*> broken_to_drul_;
+
 public:
-    /// indirection to the column it is in
-    PCol * pcol_l_;
-    
-    Item * broken_to_a_[2];
-
-    // nobreak = 0, pre =1, post = 2
-    int break_status_i()const;
-    Item * find_prebroken_piece(PCol*)const;
-    Item * find_prebroken_piece(Line_of_score*)const;    
-
-    virtual Item *item() { return this; }
-    Item();
-    Real hpos_f() const;
-    DECLARE_MY_RUNTIME_TYPEINFO;
-    virtual Line_of_score * line_l() const;
-protected:
-    virtual void  do_breakable_col_processing();
-    virtual void handle_prebroken_dependencies();
-    virtual void do_print()const;
+  VIRTUAL_COPY_CONS(Score_element);
+  Item (SCM);
+  Item (Item const &);
+
+  static bool breakable_b (Score_element*me);
+  bool broken_b () const;
+  
+  Direction break_status_dir () const;
+  
+  Item * find_prebroken_piece (Direction) const;
+  Score_element * find_broken_piece (Line_of_score*) const;    
 
+  virtual Line_of_score * line_l() const;
+  virtual Paper_column * column_l () const;
+  virtual void handle_prebroken_dependencies ();
+protected:
+  virtual void discretionary_processing ();
+  void copy_breakable_items();
 };