lily/include/item.hh

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19 #ifndef ITEM_HH
  20 #define ITEM_HH
  21
  22 #include "grob.hh"
  23
  24 /**
  25    A horizontally fixed size element of the score.
  26
  27    Item is the datastructure for printables whose width is known
  28    before the spacing is calculated
  29 */
  30 class Item : public Grob
  31 {
  32   Drul_array<Item *> broken_to_drul_;
  33
  34   DECLARE_CLASSNAME(Item);
  35 public:
  36   Item (SCM);
  37   Item (Item const &);
  38
  39   virtual Grob *clone () const;
  40
  41   static bool is_non_musical (Grob *);
  42   static bool break_visible(Grob *);
  43   static bool less (Grob * const&, Grob * const&);
  44   bool is_broken () const;
  45   bool pure_is_visible (int start, int end) const;
  46
  47   Direction break_status_dir () const;
  48
  49   Item *find_prebroken_piece (Direction) const;
  50   Grob *find_broken_piece (System *) const;
  51   virtual System *get_system () const;
  52   virtual Paper_column *get_column () const;
  53   virtual void handle_prebroken_dependencies ();
  54   virtual Interval_t<int> spanned_rank_interval () const;
  55   virtual Interval pure_height (Grob *ref, int start, int end);
  56   DECLARE_GROB_INTERFACE();
  57 protected:
  58   virtual void discretionary_processing ();
  59   void copy_breakable_items ();
  60   virtual void derived_mark () const;
  61
  62   bool cached_pure_height_valid_;
  63   Interval cached_pure_height_;
  64 };
  65
  66 Interval_t<Moment> spanned_time_interval (Item *l, Item *r);
  67
  68 #endif