Remove Event:setListener()

[superquadratic]

Maybe I overlooked something, but to me it seems like Event:setListener() is not really needed anymore. Would it be OK to remove it or does anyone use the callback and source properties of the Event object?

[makotok]

Implementation initially, I was thinking how to use the following.

local function onTest(e)
    print("hello!")
    e.target:removeEventListener(e.type, e.callback)
end

local obj = EventDispatcher()
obj:addEventListener("test", onTest)
obj:dispatchEvent("test")

If you want to remove an event listener, you can retrieve the information from the Event object. However, I do not know there are people who have this help.

[makotok]

This process is still necessary. That compatibility is lost is also a worry.

local button = widget.Button {
    size = {200, 50},
    text = "Hello",
    onClick = function(e)
        print("Hello")
        e.target:removeEventListener(e.type, e.callback)
    end,
}

[superquadratic]

That makes perfect sense, let's leave it as it is then!