This class represents an abstract graph of TreeVertexes and TreeEdges that can be constructed based on the Nodes and Links of a Diagram so that the TreeLayout can operate independently of the diagram until it is time to commit any node positioning or link routing.
（769862113）
This class represents an abstract graph of TreeVertexes and TreeEdges that can be constructed based on the Nodes and Links of a Diagram so that the TreeLayout can operate independently of the diagram until it is time to commit any node positioning or link routing.
This class inherits from LayoutNetwork.