Feature - context onstatechange event and listeners

[b-ma]

First working version

Todos

• create proper Event instance (missing target, etc)
• clear listener when the rust instance is dropped? (is it dropped actually?)

[orottier]

I was wondering if it may not be easier and more general to perform actual event dispatching, like so:

• when an audiobuffersourcenode is created
• always register an on_ended on the rust side
• in on_ended, call dispatchEvent on the Js object
• monkey patch the setter of onended to an addEventListener call

In any case, the current implementation also looks good to me

[b-ma]

Hum, that's more or less what is done, but maybe your solution would be more elegant yes, I will have a try

In any case, the current implementation is not clean as it prevents the event target to be garbage collected...

I will also have another look on that article https://www.nearform.com/blog/node-js-and-the-struggles-of-being-an-eventtarget/ which might also help having something more clean