Registers a listener for updates from the model.
Registers a listener for updates from the model.
A listener is simply a partial function which receives instances of U. Therefore
the listener can decide with pattern match cases which updates it wants to handle.
Example:
m.addListener {
case NcviewSync.Open(path) => ...
}Note: If the listener should be removed at some point, it is important to store it somewhere:
val l: NcviewSync.Listener = { case NcviewSync.Open(path) => ... } m.addListener(l) ... m.removeListener(l)
Unregisters a listener for updates from the model.