IsRelinkValid Method (ITreeModel)

This predicate is true if changing an existing link between two nodes/ports would result in a valid graph

Syntax

bool IsRelinkValid( 
   object newfromdata,
   object newtodata,
   object oldfromdata,
   object oldtodata
)

newfromdata: a node key identifying the node data from which the new link would come
newtodata: a node key identify the node data to which the new link would go
oldfromdata: a node key identifying the node data from which the existing link comes
oldtodata: a node key identify the node data to which the existing link goes