spinw.listener method

el = LISTENER(hSource, 'Eventname', callbackFcn) creates a listener
for the event named Eventname.  The source of the event is the handle  
object hSource.  If hSource is an array of source handles, the listener
responds to the named event on any handle in the array.  callbackFcn
is a function handle that is invoked when the event is triggered.
 
el = LISTENER(hSource, PropName, 'Eventname', callback) adds a 
listener for a property event.  Eventname must be one of the character 
vectors 'PreGet', 'PostGet', 'PreSet', and 'PostSet'.  PropName must be 
either a single property name or cell array of property names, or an
array of one ore more meta.property objects.  The properties must 
belong to the class of hSource.  If hSource is scalar, PropName can 
include dynamic properties.

For all forms, listener returns an event.listener.  To remove a
listener, delete the object returned by listener.  For example,
delete(el) calls the handle class delete method to remove the listener
and delete it from the workspace.  Calling delete(el) on the listener
object deletes the listener, which means the event no longer causes
the callback function to execute. 
 
LISTENER does not bind the listener's lifecycle to the object that is
the source of the event.  Destroying the source object does not impact
the lifecycle of the listener object.  A listener created with LISTENER
must be destroyed independently of the source object.  Calling delete(el) 
explicitly destroys the listener. Redefining or clearing the variable
containing the listener can delete the listener if no other references
to it exist.  To tie the lifecycle of the listener to the lifecycle
of the source object, use addlistener.
 
See also ADDLISTENER, EVENT.LISTENER, SPINW, NOTIFY, DELETE, META.PROPERTY, EVENTS Help for spinw/listener is inherited from superclass HANDLE
Reference page in Doc Center
   doc spinw/listener