src/external/3rd/application/UiBuilder/UIBuilderHistory.cpp

   1 // ======================================================================
   2 //
   3 // UIBuilderHistory.cpp
   4 // copyright (c) 2001 Sony Online Entertainment
   5 //
   6 // ======================================================================
   7
   8 #include "FirstUiBuilder.h"
   9 #include "UIBuilderHistory.h"
  10
  11 #include <vector>
  12
  13 //-----------------------------------------------------------------
  14 namespace
  15 {
  16         typedef std::vector<std::string> HistoryVector;
  17         HistoryVector * ms_history;
  18         size_t          ms_index;
  19         bool            ms_installed;
  20 }
  21 //-----------------------------------------------------------------
  22
  23 void UIBuilderHistory::install ()
  24 {
  25         assert (!ms_installed);
  26         ms_history = new HistoryVector;
  27         ms_index = 0;
  28         ms_installed = true;
  29 }
  30
  31 //-----------------------------------------------------------------
  32
  33 void UIBuilderHistory::remove ()
  34 {
  35         assert (ms_installed);
  36         delete ms_history;
  37         ms_history = 0;
  38         ms_installed = false;
  39 }
  40
  41 //-----------------------------------------------------------------
  42
  43 bool UIBuilderHistory::back (std::string & path )
  44 {
  45         if (!backValid ())
  46                 return false;
  47
  48         path = (*ms_history) [--ms_index];
  49
  50         return true;
  51 }
  52
  53 //-----------------------------------------------------------------
  54
  55 bool UIBuilderHistory::forward (std::string & path)
  56 {
  57         if (!forwardValid ())
  58                 return false;
  59
  60         path = (*ms_history) [++ms_index];
  61         return true;
  62 }
  63
  64 //-----------------------------------------------------------------
  65
  66 void UIBuilderHistory::pushNode (const std::string & path)
  67 {
  68         assert (ms_installed);
  69         if (!ms_history->empty () && ms_index < ms_history->size () - 1)
  70         {
  71                 HistoryVector::iterator it = ms_history->begin ();
  72                 std::advance (it, ms_index + 1);
  73                 ms_history->erase (it, ms_history->end ());
  74         }
  75
  76         if (!ms_history->empty ())
  77                 ++ms_index;
  78
  79         ms_history->push_back (path);
  80 }
  81
  82 //-----------------------------------------------------------------
  83
  84 bool UIBuilderHistory::backValid ()
  85 {
  86         assert (ms_installed);
  87         return (ms_index > 0);
  88 }
  89
  90 //-----------------------------------------------------------------
  91
  92 bool UIBuilderHistory::forwardValid ()
  93 {
  94         assert (ms_installed);
  95         return (ms_index < ms_history->size () - 1);
  96 }
  97
  98 //----------------------------------------------------------------------
  99
 100 bool UIBuilderHistory::isInstalled()
 101 {
 102         return ms_installed;
 103 }
 104
 105 // ======================================================================