Why do the function must pass event.EventData object

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fa wu
fa wu 2023-8-3
From this document
I found event.EventData object must be pass between notify and callbackFunction
The document give an example code use event.EventData object "evtdata"
evtdata = ToggleEventData(newState);
notify(obj,'ToggledState',evtdata);
evtdata is a ToggleEventData's object! I think pass 'evtdata' between notify and callbackFunction is enough.It seems unnecessary to pass 'ToggledState'.
I think both notify and callbackFunction should know evtdata is a ToggleEventData class object！After all we can type class(evtdata) to know evtdata is a ToggleEventData class,Matlab must know, callbackFunction must know it too！
Just like everyone knows cows are mammals

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