Method SetActiveLabel

Modules/Multilabel/src/mitkLabelSetImage.cpp:651–684

void mitk::MultiLabelSegmentation::SetActiveLabel(LabelValueType label)
{
  // The active label is soft selection state that UI/async model churn can
  // request for a value that was just removed. Accepting such a value would
  // either leave m_ActiveLabelValue referring to a label that no longer
  // exists or throw in GetGroupIndexOfLabel below, so it is ignored, keeping
  // the previous selection, and reported instead of being fatal.
  if (UNLABELED_VALUE != label && !this->ExistLabel(label))
  {
    MITK_WARN << "Ignored request to activate a label that does not exist. Invalid label value: " << label;
    return;
  }

  if (m_ActiveLabelValue != label)
  {
    bool eventNeeded = false;
    if (UNLABELED_VALUE == m_ActiveLabelValue || UNLABELED_VALUE == label || !this->ExistLabel(m_ActiveLabelValue))
    {
      eventNeeded = true;
    }
    else if (this->GetGroupIndexOfLabel(m_ActiveLabelValue) != this->GetGroupIndexOfLabel(label))
    {
      eventNeeded = true;
    }

    m_ActiveLabelValue = label;
    Modified();

    if (eventNeeded)
    {
      AfterChangeLayerEvent.Send();
    }
  }
}

void mitk::MultiLabelSegmentation::ClearGroupImage(GroupIndexType groupID)
{