Method MoveNodeDown

Modules/QtWidgets/src/mitkRenderWindowLayerController.cpp:276–317

}

bool mitk::RenderWindowLayerController::MoveNodeDown(DataNode* dataNode, const BaseRenderer* renderer /*= nullptr*/)
{
  if (nullptr == dataNode)
  {
    return false;
  }

  // get the layer stack of the current renderer
  RenderWindowLayerUtilities::LayerStack stackedLayers = RenderWindowLayerUtilities::GetLayerStack(m_DataStorage, renderer);
  if (!stackedLayers.empty())
  {
    // get the current layer value of the given data node
    int currentLayer;
    bool wasFound = dataNode->GetIntProperty("layer", currentLayer, renderer);
    if (wasFound)
    {
      // get the current layer in the map of stacked layers
      RenderWindowLayerUtilities::LayerStack::const_iterator layerStackIterator = stackedLayers.find(currentLayer);
      if (layerStackIterator != stackedLayers.end())
      {
        // found the element in the map ...
        RenderWindowLayerUtilities::LayerStack::const_iterator nextLayerStackIterator = std::next(layerStackIterator);
        if (nextLayerStackIterator != stackedLayers.end())
        {
          // ... and found a successor ->
          // current node is not on the lowermost layer and therefore can be moved one layer down
          // swap the layers of the dataNode and the dataNode on the next lower layer (next map element)
          dataNode->SetIntProperty("layer", nextLayerStackIterator->first, renderer);
          nextLayerStackIterator->second->SetIntProperty("layer", currentLayer, renderer);
          dataNode->Modified();
          mitk::RenderingManager::GetInstance()->RequestUpdate(renderer->GetRenderWindow());
          return true;
        }
        // else: data node is already the lowermost layer node
      }
      // else: layer stack does not contain a layer with the 'currentLayer'
    }
    // else: data node has no layer information
  }
  // else: do not work with empty layer stack
  return false;
}