src/meterreg.cc

   1 /*
   2   meterreg.cc -- implement Meter_register
   3
   4   source file of the LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9 #include "meterreg.hh"
  10 #include "meter.hh"
  11 #include "commandrequest.hh"
  12
  13 Meter_register::Meter_register(Complex_walker*w)
  14     : Request_register(w)
  15 {
  16     do_post_move_process();
  17 }
  18
  19 bool
  20 Meter_register::try_request(Request*r_l)
  21 {
  22     if (!r_l->command()->meterchange())
  23         return false;
  24
  25     assert(!meter_req_l_);
  26     meter_req_l_ = r_l->command()->meterchange();
  27
  28     return true;
  29 }
  30
  31 void
  32 Meter_register::process_request()
  33 {
  34     if (meter_req_l_ ) {
  35         Array<Scalar> args;
  36         args.push(meter_req_l_->beats_i_);
  37         args.push(meter_req_l_->one_beat_i_);
  38
  39         meter_p_ = new Meter(args);
  40     }
  41
  42     if (meter_p_)
  43         announce_element(Staff_elem_info(meter_p_, meter_req_l_, this) );
  44 }
  45
  46 void
  47 Meter_register::do_pre_move_process()
  48 {
  49     if (meter_p_) {
  50         Meter * post_p =new Meter(*meter_p_);
  51         Meter * pre_p =new Meter(*meter_p_);
  52
  53         typeset_breakable_item(pre_p, meter_p_, post_p);
  54         meter_p_ =0;
  55     }
  56 }
  57
  58 void
  59 Meter_register::do_post_move_process()
  60 {
  61     meter_req_l_ = 0;
  62     meter_p_ =0;
  63 }