Hello, I tried to practice with event and listener objects.
As I practiced, I made two classes, one with an event and one with a listener function upon the event.
I noticed that the listener doesnt display messages if the event is trigerred through the workspace.
The event code:
classdef EventPractice < handle
properties (SetObservable = true)
NumEvent = 1
end
events
NumChangedEvent
end
methods
function set.NumEvent(obj,value)
obj.NumEvent = value;
notify(obj,'NumChangedEvent');
end
end
end
The listener code:
classdef ListenerPractice < handle
properties
NumListener = 1
end
methods
function obj = ListenerPractice(EventSrc)
addlistener(EventSrc,'NumChangedEvent',@obj.ListenerReaction);
end
end
methods
function ListenerReaction(obj,EventSrc,~)
obj.NumListener = EventSrc.NumEvent
disp(['The event Num has changed. The listener Num changes to the same num: 'num2str(EventSrc.NumEvent)])
end
end
end
Creation Code:
EventExample = EventPractice;
ListenerExample = ListenerPractice(EventExample);
Change at the Workspace:
Change reaction at the ListenerExample variable:
Empty Command Window:
After this whole process, If the NumListener variable changed at the listener function 'ListenerReaction', why didnt the disp() function also go into action?
Thank you for reading,
Yuval Blutman.
