The resource flow graph (RFG) library
This observer listens to nodes.
This message is sent if the node is destroying itself.
This message is sent if the node has been changed.
This message is sent if an incoming edge has been added to the node.
This message is sent if an outgoing edge has been added to the node.
This message is sent if an incoming edge has been removed from the node.
This message is sent if an outgoing edge has been removed from the node.
This observer listens to a view.
This message is send if the view is destroying itself.
This message is sent if the attributes (e.g. read-only) of the view have been changed.
This message is sent if a node has been added to the view.