MATLAB Object-Oriented Programming

Create Listener for Overflow Event

To listen for the Overflow event, attach a listener to an instance of the

SimpleEventClass class. Use the addlistener method to create the listener. Also, you

must define a callback function for the listener to execute when the event is triggered.

The function setupSEC instantiates the SimpleEventClass class and adds a listener to

the object. In this example, the listener callback function displays information that is

contained in the eventData argument (which is a SpecialEventDataClass object).

function sec = setupSEC

sec = SimpleEventClass;

addlistener(sec,'Overflow',@overflowHandler)

function overflowHandler(eventSrc,eventData)

disp('The value of Prop1 is overflowing!')

disp(['Its value was: ' num2str(eventData.OrgValue)])

disp(['Its current value is: ' num2str(eventSrc.Prop1)])

end

end

Create the SimpleEventClass object and add the listener:

sec = setupSEC;

sec.Prop1 = 5;

sec.Prop1 = 15; % listener triggers callback

The value of Prop1 is overflowing!

Its value was: 5

Its current value is: 15

See Also

Related Examples

• “Observe Changes to Property Values” on page 11-9

11 Events — Sending and Responding to Messages