How to create an instance with its own ENTER_FRAME event

zehreken · November 2012

Hi,
I want my object instances have their own ENTER_FRAME events but I couldn't manage to do it. Here is my test code.

Object.lua

Object = Core.class(Sprite)
local tmp = 0
local function onEnterFrame()
	tmp = tmp + 1
	print(tmp)
end
function Object:init()
	self:addEventListener(Event.ENTER_FRAME, onEnterFrame)
end

Main.lua

for i=1,4 do
	local object = Object.new()
end

I expect an output like this

And this is what I get

0
1
2...

Only the first instance gives this output.

Nascode · November 2012

Dont forget to add third argument to :addEventListener

self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self)

zehreken · November 2012

Nope, it doesn't make a difference.

Scouser · November 2012

Try this
Object.lua:

Object = Core.class(Sprite)
local function onEnterFrame(this)
	this.tmp = this.tmp + 1
	print(this.tmp)
end
 
function Object:init()
	self:addEventListener(Event.ENTER_FRAME, onEnterFrame, self)
	self.tmp = 0
end

main.lua:

local instances = {}
 
for i=1,4 do
	instances[#instances+1] = Object:new()
end

zehreken · November 2012

It works, thank you.

Mells · November 2012

this works too :

 
Object = Core.class(Sprite)
function Object:init()
        self.tmp = 0
	self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self)
end
function Object:onEnterFrame()
	self.tmp = self.tmp + 1
	print(self.tmp)
end

Maybe it would be more appropriate for some other cases than the Enter_frame event though.
I like the fact that onEnterFrame() is not accessible from "outside" in Scouser's example.

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