Method OnLabelRemoved

Modules/SegmentationUI/src/QmitkMultiLabelTreeModel.cpp:1073–1119

}

void QmitkMultiLabelTreeModel::OnLabelRemoved(LabelValueType labelValue)
{
  if (labelValue == mitk::MultiLabelSegmentation::UNLABELED_VALUE) return;
  auto instanceItem = GetInstanceItem(labelValue, this->m_RootItem.get());

  if (nullptr == instanceItem)
    mitkThrow() << "Internal invalid state. QmitkMultiLabelTreeModel received a LabelRemoved signal for a label that is not represented in the model. Invalid label: " << labelValue;

  const auto nextItem = ClosestLabelInstanceIndex(instanceItem);
  if (nullptr != nextItem)
  {
    m_NearestLabelValueToLastChange = nextItem->GetLabelValue();
  }
  else
  {
    m_NearestLabelValueToLastChange = mitk::MultiLabelSegmentation::UNLABELED_VALUE;
  }

  auto labelItem = instanceItem->ParentItem();

  m_ModelUpdateOngoing = true;
  if (labelItem->m_childItems.size() > 2)
  {
    auto labelIndex = GetIndexByItem(labelItem, this);
    this->beginRemoveRows(labelIndex, instanceItem->Row(), instanceItem->Row());
    labelItem->RemoveChild(instanceItem->Row());
    this->endRemoveRows();
  }
  else if (labelItem->m_childItems.size() == 2)
  { //After removal only one label is left -> the whole label node is about to be changed (no instances are shown any more).
    auto labelIndex = GetIndexByItem(labelItem, this);
    this->beginRemoveRows(labelIndex, instanceItem->Row(), instanceItem->Row());
    labelItem->RemoveChild(instanceItem->Row());
    this->endRemoveRows();
    emit dataChanged(labelIndex, labelIndex);
  }
  else
  { //was the only instance of the label, therefor also remove the label node from the tree.
    auto groupItem = labelItem->ParentItem();
    auto groupIndex = GetIndexByItem(groupItem, this);
    this->beginRemoveRows(groupIndex, labelItem->Row(), labelItem->Row());
    groupItem->RemoveChild(labelItem->Row());
    this->endRemoveRows();
  }
  m_ModelUpdateOngoing = false;
  emit modelChanged();
}

void QmitkMultiLabelTreeModel::OnGroupAdded(GroupIndexType groupIndex)
{