src/clef-reg.cc

   1 /*
   2   clef.cc -- implement  Clef_register
   3
   4   source file of the LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>,
   7   Mats Bengtsson <matsb@s3.kth.se>
   8 */
   9
  10 #include "clef-reg.hh"
  11 #include "clef-item.hh"
  12 #include "debug.hh"
  13 #include "commandrequest.hh"
  14 #include "time-description.hh"
  15 #include "staff-column.hh"
  16
  17 Clef_register::Clef_register()
  18 {
  19     clef_p_ = 0;
  20
  21     /* ugly hack to prevent segfault (daddy_reg_l_ == 0 at construction) */
  22     clef_type_str_ = "";
  23 }
  24
  25 bool
  26 Clef_register::set_type(String s)
  27 {
  28     clef_type_str_  = s;
  29     if (clef_type_str_ == "violin") {
  30         c0_position_i_= -2;
  31     } else if (clef_type_str_ == "alto") {
  32         c0_position_i_= 4;
  33     } else if (clef_type_str_ == "tenor") {
  34         c0_position_i_= 6;
  35     } else if (clef_type_str_ == "bass") {
  36         c0_position_i_= 10;
  37     }else
  38         return false;
  39     *get_staff_info().c0_position_i_ = c0_position_i_;
  40
  41     return true;
  42 }
  43
  44 void
  45 Clef_register::read_req(Clef_change_req*c_l)
  46 {
  47     if (!set_type(c_l->clef_str_))
  48         error("unknown clef type ", c_l->defined_ch_c_l_);
  49 }
  50
  51 bool
  52 Clef_register::try_request(Request * r_l)
  53 {
  54     Command_req* creq_l= r_l->command();
  55     if (!creq_l || !creq_l->clefchange())
  56         return false;
  57
  58     clef_req_l_ = creq_l->clefchange();
  59
  60     // do it now! Others have to read c0_pos.
  61     read_req(creq_l->clefchange());
  62     return true;
  63 }
  64
  65 void
  66 Clef_register::process_requests()
  67 {
  68     const Time_description *time_l = get_staff_info().time_c_l_;
  69     if (!clef_req_l_ && (!time_l->whole_in_measure_|| !time_l->when_)) {
  70         clef_p_ = new Clef_item;
  71         clef_p_->change = false;
  72     } else if (clef_req_l_) {
  73         clef_p_ = new Clef_item;
  74         clef_p_->change = true;
  75     }
  76     if (clef_p_) {
  77         clef_p_->read(*this);
  78         announce_element(Staff_elem_info(clef_p_,
  79                                          clef_req_l_));
  80     }
  81 }
  82
  83 void
  84 Clef_register::pre_move_processing()
  85 {
  86     if (!clef_p_)
  87         return;
  88     if (clef_p_->change) {
  89         Clef_item* post_p = new Clef_item(*clef_p_);
  90         post_p->change = false;
  91         typeset_breakable_item(new Clef_item(*clef_p_),
  92                                clef_p_,  post_p);
  93     } else {
  94         typeset_breakable_item(0, 0, clef_p_);
  95     }
  96     clef_p_ = 0;
  97 }
  98
  99 void
 100 Clef_register::post_move_processing()
 101 {
 102     clef_req_l_ = 0;
 103     /* not in ctor, since the reg might not be linked in.*/
 104     if (clef_type_str_ == "") {
 105         set_type("violin");
 106     }
 107 }