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How do I get a subclass to listen to an event generated in a superclass?
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I have a superclass, BasicPlot that generates an event 'DonePlotting' when the main plotting method is finished: notify(s, 'DonePlotting', event.EventData), where 's' is the object handle returned by the BasicPlot constructor.
A subclass FancyPlot < BasicPlot has a listener in its constructor that's supposed to be triggered by 'DonePlotting': s.hLsnr = addlistener(s, 'DonePlotting', 'PostSet', @(src, evt)fancyplot_event(s, src, evt));
However, when it gets to that line, Matlab reports, "The name 'DonePlotting' is not an accessible property for an instance of class 'FancyPlot'.
When I stop the program in the debugger just before the addlistener line and ask for 'events(s)', it lists 'DonePlotting'. Hum...
So, how do I get the subclass to listen to an event generated by the superclass?
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Answers (1)
Spruha
on 16 Jun 2025
Hi Etaoin,
The issue you're encountering is due to the incorrect usage of the 'PostSet' argument. You're trying to listen for an event, but you are using the syntax for a property listener.
This results in the following error:
"The name 'DonePlotting' is not an accessible property for an instance of class 'FancyPlot'."
This is because 'PostSet' is trying to find a property named ‘DonePlotting’. However, it is an event, not a property.
You can refer to the below code samples:
addlistener(obj, 'EventName', callback)
2. For properties -
addlistener(obj, 'PropertyName', 'PostSet', callback)
Hope this helps!
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