command.C

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#include "geom/world.H"
#include "geom/command.H"

/*****************************************************************
 * COMMAND:
 *****************************************************************/
bool
COMMAND::doit()
{
   _is_done = true;
   _is_undone = false;
   return true;
}

bool
COMMAND::undoit()
{
   _is_done = false;
   _is_undone = true;
   return true;
}

bool
COMMAND::clear()
{
   if (is_done())
      return false;

   _is_done = _is_undone = false;
   return true;
}

/*****************************************************************
 * UNDO_CMD:
 *****************************************************************/
bool
UNDO_CMD::doit()
{
   if (_cmd && _cmd->undoit())
      return COMMAND::doit();   // update state in COMMAND
   return false;
}

bool
UNDO_CMD::undoit()
{
   if (_cmd && _cmd->doit())
      return COMMAND::undoit(); // update state in COMMAND
   return false;
}

bool
UNDO_CMD::clear()
{
   if (!COMMAND::clear())       // update state in COMMAND
      return false;

   if (_cmd)
      _cmd->clear();
   return true;
}

/*****************************************************************
 * DISPLAY_CMD:
 *****************************************************************/
bool
DISPLAY_CMD::doit()
{
   for (int i = 0; i < _gels.num(); i++)
      WORLD::display (_gels[i], false);

   return COMMAND::doit();      // update state in COMMAND
}

bool
DISPLAY_CMD::undoit()
{
   // Go in reverse order, in case it matters:
   for (int i = _gels.num()-1; i >= 0 ; i--)
      WORLD::undisplay(_gels[i], false);

   return COMMAND::undoit();    // update state in COMMAND
}

/*****************************************************************
 * MULTI_CMD:
 *****************************************************************/
bool 
MULTI_CMD::doit()
{
   for (int i=0; i <_commands.num(); i++) 
      _commands[i]->doit();

   return COMMAND::doit();      // update state in COMMAND
}

bool
MULTI_CMD::undoit() 
{
   // undo in reverse order
   for (int i=_commands.num()-1; i >= 0; i--) 
      _commands[i]->undoit();

   return COMMAND::undoit();    // update state in COMMAND
}

bool
MULTI_CMD::clear() 
{
   if (!COMMAND::clear())       // update state in COMMAND
      return false;

   // Clear in reverse order
   for (int i=_commands.num()-1; i >= 0; i--) 
      _commands[i]->clear();
   return true;
}

/* end of file command.C */

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