release: 1.3.70

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

diff --git a/lily/include/item.hh b/lily/include/item.hh
index 622f0f0dea50657e9bdc60f4e52a67950f1c849e..16f298f7f2361983d612975fcd699d3e6dfff2d2 100644 (file)
--- a/lily/include/item.hh
+++ b/lily/include/item.hh
@@ -1,20 +1,22 @@
 /*
   item.hh -- declare Item
 
-  source file of the LilyPond music typesetter
+  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 "staff-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
@@ -22,27 +24,41 @@
   NB. This doesn't mean an Item has to initialize the output field before
   spacing calculation. 
   
-*/
-class Item : public Staff_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_;
-
-    /* *************** */
-    virtual Item *item() { return this; }
-    Item();
-    void do_print()const;
-    Real hpos_f() const;
-    NAME_MEMBERS(Item);
-    /**
-      
-      @return the line where this is in; 
-
-      PRE
-      Breaking calc has  to be finished
-     */
-    Line_of_score * line_l() 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();
 };
 
 
+
 #endif