BackupData.cc

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/*===========================================================================*\
*                                                                            *
*   $Revision$                                                       *
*   $LastChangedBy$                                                *
*   $Date$                     *
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\*===========================================================================*/

#include "BackupData.hh"

//-----------------------------------------------------------------------------

BackupData::BackupData(BaseObjectData* _object) : currentState_(0), object_(_object), maxBackups_(20)
{
}

//-----------------------------------------------------------------------------

BackupData::~BackupData(){
  clear();
}

//-----------------------------------------------------------------------------

size_t BackupData::maxBackups()
{
  return maxBackups_;
}

//-----------------------------------------------------------------------------

void BackupData::setMaxBackups(size_t _max)
{
  maxBackups_ = _max;
}

//-----------------------------------------------------------------------------

void BackupData::storeBackup(BaseBackup* _backup){

  //store state
  if ( currentState_ != 0 )
    undoStates_.push_back( currentState_ );

  currentState_ = _backup;
  
  //clear redo states
  while( !redoStates_.empty() ){
    delete redoStates_.back();
    redoStates_.pop_back();
  }

  //delete undo backups if there are too many
  while( undoStates_.size() > maxBackups_ ){
    delete undoStates_.front();
    undoStates_.erase( undoStates_.begin() );
  }
}

//-----------------------------------------------------------------------------

void BackupData::undo(){

  if ( undoStates_.empty() )
    return;

  //get backup
  BaseBackup* backup = undoStates_.back();
  
  //apply
  backup->apply();
  
  // update current state
  undoStates_.pop_back();
  redoStates_.push_back( currentState_ );
  currentState_ = backup;
}

//-----------------------------------------------------------------------------

void BackupData::redo(){

  if ( redoStates_.empty() )
    return;

  //get backup
  BaseBackup* backup = redoStates_.back();
  
  //apply
  backup->apply();
  
  // update current state
  redoStates_.pop_back();
  undoStates_.push_back( currentState_ );
  currentState_ = backup;
}

//-----------------------------------------------------------------------------

QString BackupData::undoName(){

  if ( undoStates_.empty() )
    return QString();

  return currentState_->name();
}

//-----------------------------------------------------------------------------

QString BackupData::redoName(){

  if ( redoStates_.empty() )
    return QString();

  return redoStates_.back()->name();
}

//-----------------------------------------------------------------------------

int BackupData::undoID(){

  if ( undoStates_.empty() )
    return -1;

  return undoStates_.back()->id();
}

//-----------------------------------------------------------------------------

int BackupData::redoID(){

  if ( redoStates_.empty() )
    return -1;

  return redoStates_.back()->id();
}

//-----------------------------------------------------------------------------

int BackupData::currentID(){

  if ( currentState_ == 0 )
    return -1;
  else
    return currentState_->id();
}

//-----------------------------------------------------------------------------

bool BackupData::undoAvailable(){
  return !undoStates_.empty();
}

//-----------------------------------------------------------------------------

bool BackupData::redoAvailable(){
  return !redoStates_.empty();
}

//-----------------------------------------------------------------------------

bool BackupData::undoBlocked(){

  if( !undoStates_.empty() )
    return currentState_->blocked();
  else
    return false;
}

//-----------------------------------------------------------------------------

bool BackupData::redoBlocked(){

  if( !redoStates_.empty() )
    return redoStates_.back()->blocked();
  else
    return false;
}
//-----------------------------------------------------------------------------

void BackupData::clear(){

  while( !undoStates_.empty() ){
    delete undoStates_.back();
    undoStates_.pop_back();
  }

  while( !redoStates_.empty() ){
    delete redoStates_.back();
    redoStates_.pop_back();
  }

  if ( currentState_ != 0 )
    delete currentState_;
  currentState_ = 0;
}

//-----------------------------------------------------------------------------

void BackupData::setLinks(IdList _objectIDs){

  if ( currentState_ != 0 )
    currentState_->setLinks(_objectIDs);
}

//-----------------------------------------------------------------------------

BaseBackup* BackupData::currentState(){
  return currentState_;
}

//-----------------------------------------------------------------------------