Modifier Notifications

#preModifierAdded: #(node, modifier) 

Sent before a modifier is added to a node.

Calling callbacks.notificationParam() within the callback function will return a 2 element array containing the node and the modifier which was added.

#postModifierAdded: #(node, modifier) 

Sent after a modifier is added to a node.

Calling callbacks.notificationParam() within the callback function will return a 2 element array containing the node and the modifier which was added.

#preModifierDeleted: #(node, modifier) 

Sent before a modifier is deleted from a node.

Calling callbacks.notificationParam() within the callback function will return a 2 element array containing the node and the modifier which was deleted.

#postModifierDeleted: #(node, modifier) 

Sent after a modifier is deleted from a node.

Calling callbacks.notificationParam() within the callback function will return a 2 element array containing the node and the modifier which was deleted.