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1 /*
2   slur-performer.cc -- implement Slur_performer
3
4   source file of the GNU LilyPond music typesetter
5
6   (c) 1996--2004 Jan Nieuwenhuizen <janneke@gnu.org>
7  */
8
9 #include "performer.hh"
10 #include "event.hh"
11 #include "audio-item.hh"
12 #include "audio-column.hh"
13 #include "global-context.hh"
14 #include "warn.hh"
15
16 /*
17   this is C&P from beam_performer.
18  */
19
20 class Slur_performer : public Performer {
21 public:
22   TRANSLATOR_DECLARATIONS (Slur_performer);
23   
24 protected:
25   virtual bool try_music (Music *ev) ;
26   virtual void start_translation_timestep ();
27   virtual void process_music ();
28   void set_melisma (bool);
29 private:
30   Music *start_ev_;
31   Music *now_stop_ev_;
32   bool slur_;
33 };
34
35 void 
36 Slur_performer::process_music ()
37 {
38   if (now_stop_ev_)
39     {
40       slur_ = false;
41     }
42
43   if (start_ev_)
44     {
45       slur_ = true;
46       set_melisma (true);
47     }
48 }
49
50
51 void
52 Slur_performer::set_melisma (bool ml)
53 {
54   daddy_context_->set_property ("slurMelismaBusy", ml ? SCM_BOOL_T :SCM_BOOL_F);
55 }
56
57 void
58 Slur_performer::start_translation_timestep ()
59 {
60   if (slur_)
61     {
62       set_melisma (true);
63     }
64   
65   start_ev_ = 0;
66   now_stop_ev_ = 0;
67 }
68  
69 bool
70 Slur_performer::try_music (Music *m)
71 {
72   if (m->is_mus_type ("slur-event"))
73     {
74       Direction d = to_dir (m->get_property ("span-direction"));
75
76       if (d == START)
77         {
78           start_ev_ = m;
79         }
80       else if (d==STOP)
81         {
82           now_stop_ev_ = m;
83         }
84       return true;
85     }
86   return false;
87 }
88
89 ENTER_DESCRIPTION (Slur_performer,"","",
90                   "slur-event","","","");
91
92 Slur_performer::Slur_performer ()
93 {
94   slur_ = false;
95 }