MATLAB Object-Oriented Programming

ListenerHandle % Property for listener handle

end

methods

function obj = RespondToToggle(toggle_button_obj)

hl = addlistener(toggle_button_obj,'ToggledState',@RespondToToggle.handleEvnt);

obj.ListenerHandle = hl; % Save listener handle

end

end

methods (Static)

function handleEvnt(src,~)

if src.State

disp('ToggledState is true')

else

disp('ToggledState is false')

end

end

end

end

With this code change, you can remove the listener from an instance of the

RespondToToggle class. For example:

tb = ToggleButton;

rtt = RespondToToggle(tb);

The object rtt is listening for the ToggleState event triggered by object tb. To remove

the listener, call delete on the property containing the listener handle.

delete(rtt.ListenerHandle)

To deactivate a listener temporarily, see “Temporarily Deactivate Listeners” on page 11-

28.

Define Event-Specific Data

Suppose that you want to pass the state of the toggle button as a result of the event to the

listener callback. You can add more data to the default event data by subclassing the

event.EventData class and adding a property to contain this information. Then you can

pass this object to the handle.notify method.

NoteTo save and load objects that are subclasses of event.EventData, such as

ToggleEventData, enable the ConstructOnLoad class attribute for the subclass.

classdef (ConstructOnLoad) ToggleEventData < event.EventData

properties

11 Events — Sending and Responding to Messages