internal TNode ActualFromNode()
{
if (DragFromNode == null)
{
return(null);
}
if (DragFromNode == DragToNode || DragToNode == null) // self-wiring or no to-route
{
return(DragFromNode);
}
if (DragFromNodeHitPath == null) // fromNode top level
{
return(DragFromNode);
}
if (DragToNodeHitPath == null) // counterpart top level
{
return(DragFromNodeHitPath[0].As <TNode>());
}
var lca = HitPathsGetLowestCommonAncestor();
if (lca == null)
{
return(DragFromNodeHitPath[0].As <TNode>()); // counterpart in another container
}
int index = DragFromNodeHitPath.IndexOf(lca);
return(DragFromNodeHitPath[index + 1].As <TNode>()); // return the child node of the lca
}
