MATLAB Object-Oriented Programming

If your listener callback is an ordinary method and not a static method, the syntax is:

addlistener(EventObject,'PropOne','PostSet',@obj.handlePropertyEvents);

where obj is the handle of the object defining the callback method.

If the listener callback is a function that is not a class method, you pass a function handle

to that function. Suppose that the callback function is a package function:

addlistener(EventObject,'PropOne','PostSet',@package.handlePropertyEvents);

For more information on passing functions as arguments, see “Create Function Handle”.

Property Event and Listener Classes

The following two classes show how to create PostSet property listeners for two

properties — PropOne and PropTwo.

Class Generating the Event

The PropEvent class enables property PreSet and PostSet event triggering by

specifying the SetObservable property attribute. These properties also enable the

AbortSet attribute, which prevents the triggering of the property events if the

properties are set to a value that is the same as their current value (see “Assignment

When Property Value Is Unchanged” on page 11-44).

classdef PropEvent < handle

properties (SetObservable, AbortSet)

PropOne

PropTwo

end

methods

function obj = PropEvent(p1,p2)

if nargin > 0

obj.PropOne = p1;

obj.PropTwo = p2;

end

end

end

end

Class Defining the Listeners

The PropListener class defines two listeners:

11 Events — Sending and Responding to Messages