// remove this, just for debug:
protected virtual TransferDataSource DragDataSource()
{
var result = new TransferDataSource();
result.AddValue <string>("hello drag");
return(result);
}
public virtual TransferDataSource TransferDataOfVisual(IGraph <IVisual, IVisualEdge> graph, IVisual visual)
{
if (graph == null || visual == null)
{
return(null);
}
var result = new TransferDataSource();
result.AddValue <string> (visual.Data.ToString());
return(result);
}