lily/meter-performer.cc

   1 /*
   2   meter-performer.cc -- implement Meter_performer
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1998 Jan Nieuwenhuizen <jan@digicash.com>
   7 */
   8
   9 #include "meter-performer.hh"
  10 #include "command-request.hh"
  11 #include "audio-item.hh"
  12
  13 IMPLEMENT_IS_TYPE_B1(Meter_performer,Performer);
  14 ADD_THIS_TRANSLATOR(Meter_performer);
  15
  16 Meter_performer::Meter_performer()
  17 {
  18   meter_req_l_ = 0;
  19 }
  20
  21 Meter_performer::~Meter_performer()
  22 {
  23 }
  24
  25 void
  26 Meter_performer::do_print() const
  27 {
  28 #ifndef NPRINT
  29   if (meter_req_l_)
  30     meter_req_l_->print();
  31 #endif
  32 }
  33
  34 void
  35 Meter_performer::do_process_requests()
  36 {
  37   if (meter_req_l_)
  38     play (new Audio_meter (meter_req_l_));
  39   meter_req_l_ = 0;
  40 }
  41
  42 bool
  43 Meter_performer::do_try_request (Request* req_l)
  44 {
  45   if (meter_req_l_)
  46     return false;
  47
  48   if (req_l->command())
  49     meter_req_l_ = req_l->command()->meterchange ();
  50
  51   if (meter_req_l_)
  52     return true;
  53
  54   return false;
  55 }
  56