Error - Can getTarget() from "click" but event.x returns nil. Any idea?

Mells · July 2012

Hi community,

My code is - I believe - really basic and I don't see where the error comes from.
I have tried to isolate the part that raises an issue. Error could be located somewhere else but I have no idea where it could be :

function Interface:init()
        -- FB
	local fbButton
	fbButton = Button.new(Bitmap.new(...))	
	fbButton:addEventListener("click", self.onFbClick, self)
	stage:addChild(fbButton)
        fbButton.debugName = "bob"
end

and

function Interface:onFbClick(event)
	local target = event:getTarget()
        print (target.debugName)  -- prints "bob" correctly
        print (event.x, event.y)      -- prints "nil, nil"
 
	if target:hitTestPoint(event.x, event.y) then	-- And then here the error happens -> bad argument #1 to 'hitTestPoint' (number expected, got nil)	
		event:stopPropagation()					
		print ("Fb sharing")
	end
end

I don't understand why I can get the target from the event, but not event.x and event.y.

Has it ever happened to you and how did you solve it?

talis · July 2012

Hi Mells,

You want to get x,y coordinate of the place on the fbButton?
event:getTarget() return the button, not the listener function.

Scouser · July 2012

Try here, it should give you the information you want.

atilim · July 2012

While Button class dispatches "click" event, it doesn't set event.x and event.y fields. And Button class already does the hitTestPoint check and stopPropagation. I think your function should be just:

function Interface:onFbClick(event)
	print ("Fb sharing")
end

Mells · July 2012

Thank you all

About the Button class -> Wow, I love it when Gideros already does the work for me (I should have checked the code more).

My mistakes :

I assumed that *all* click events come with event.x and event.y fields set
Lack of understanding of what the Button class is doing under the hood

So here is what I had to do :

function Interface:init()
        -- FB
	local fbButton
	fbButton = Button.new(...)	
	stage:addChild(fbButton)
	fbButton:addEventListener("click", self.onFbClick)
end
 
function Interface:onFbClick(event)	
		print ("Fb sharing")
end

Thank you community.

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