BackupData.cc

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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_;
}
 
//-----------------------------------------------------------------------------