Widget.addDirectEventListener

Events use a Javascript-esque model. See more details on the Event page.

addEventListener returns an opaque handle that you can later pass to removeEventListener.

addDirectEventListener just inserts a check if(e.target !is this) return; meaning it opts out of participating in handler delegation.

Use scope on your handlers when you can. While it currently does nothing, this will future-proof your code against future optimizations I want to do. Instead of copying whole event objects out if you do need to store them, just copy the properties you need.

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