public override void ApplyLayout(LayoutGraph graph)
{
// determine the single node to keep at the center.
var provider = graph.GetDataProvider("NodeLayouts");
Node centerNode = null;
if (provider != null)
{
centerNode = graph.Nodes.FirstOrDefault(n => provider.Get(n) != null);
}
if (CoreLayout != null)
{
if (centerNode != null)
{
// remember old center
RectD oldLayout = (RectD)provider.Get(centerNode);
var fixedLocation = new YPoint(graph.GetX(centerNode) + graph.GetWidth(centerNode), graph.GetY(centerNode));
//Set to saved size (this is important for collapsed nodes to ensure correct size)
graph.SetSize(centerNode, oldLayout.Width, oldLayout.Height);
// run layout
CoreLayout.ApplyLayout(graph);
// obtain new center
var newFixedLocation = new YPoint(graph.GetX(centerNode) + graph.GetWidth(centerNode),
graph.GetY(centerNode));
// and adjust the layout
LayoutGraphUtilities.MoveSubgraph(graph, graph.GetNodeCursor(), fixedLocation.X - newFixedLocation.X,
fixedLocation.Y - newFixedLocation.Y);
}
else
{
CoreLayout.ApplyLayout(graph);
}
}
}