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
}
// Gets the lowest common ancestor (LCA) for the 2 hit path
private TNode HitPathsGetLowestCommonAncestor()
{
if (DragToNodeHitPath == null || DragFromNodeHitPath == null)
{
return(null);
}
for (int i = DragToNodeHitPath.Count - 1; i >= 0; --i)
{
if (DragFromNodeHitPath.Contains(DragToNodeHitPath[i]))
{
return(DragToNodeHitPath[i].As <TNode>());
}
}
return(null);
}
