libs/ardour/state_manager.cc

   1 #include <pbd/error.h>
   2 #include <ardour/state_manager.h>
   3
   4 #include "i18n.h"
   5
   6 using namespace ARDOUR;
   7
   8 StateManager::StateManager ()
   9 {
  10         _current_state_id = 0;
  11 }
  12
  13 StateManager::~StateManager()
  14 {
  15 }
  16
  17 void
  18 StateManager::drop_all_states ()
  19 {
  20         for (StateMap::iterator i = states.begin(); i != states.end(); ++i) {
  21                 delete *i;
  22         }
  23
  24         states.clear ();
  25
  26         save_state (_("cleared history"));
  27 }
  28
  29 void
  30 StateManager::use_state (state_id_t id)
  31 {
  32         Change what_changed;
  33         state_id_t n;
  34         StateMap::iterator i;
  35
  36         for (n = 0, i = states.begin(); n < id && i != states.end(); ++n, ++i);
  37
  38         if (n != id || i == states.end()) {
  39                 fatal << compose (_("programming error: illegal state ID (%1) passed to "
  40                                     "StateManager::set_state() (range = 0-%3)"), id,
  41                                   states.size()-1)
  42                       << endmsg;
  43                 /*NOTREACHED*/
  44                 return;
  45         }
  46
  47         what_changed = restore_state (**i);
  48         _current_state_id = id;
  49         send_state_changed (what_changed);
  50 }
  51
  52 void
  53 StateManager::save_state (std::string why)
  54 {
  55         states.push_back (state_factory (why));
  56         _current_state_id = states.size() - 1;
  57 }
  58
  59 void
  60 StateManager::send_state_changed (Change what_changed)
  61 {
  62         StateChanged (what_changed);
  63 }