Scene manager and local global variables

Ninjadoodle

Hi guys,

Just trying to figure out how to communicate between the different 'scene manager functions'.

Scene1 = gideros.class(Sprite)   function Scene1:init() self:addEventListener("enterBegin", self.onTransitionInBegin, self) self:addEventListener("enterEnd", self.onTransitionInEnd, self) self:addEventListener("exitBegin", self.onTransitionOutBegin, self) self:addEventListener("exitEnd", self.onTransitionOutEnd, self) end   function Scene1:onTransitionInBegin() print("scene1 - enter begin")   createContainers(self)   local lightSwitch = LightSwitch.new(160, 160, layerMG) end   function Scene1:onTransitionInEnd() print("scene1 - enter end")   local function lightSwitchTouch(button, event) if lightSwitch:hitTestPoint(event.x, event.y) then sceneManager:changeScene('scene2', 2, SceneManager.flipWithShade, easing.inOutQuadratic) lightSwitch:removeEventListener(Event.MOUSE_UP, lightSwitchTouch, lightSwitch) end end   lightSwitch:addEventListener(Event.MOUSE_UP, lightSwitchTouch, lightSwitch) end   function Scene1:onTransitionOutBegin() print("scene1 - exit begin") end   function Scene1:onTransitionOutEnd() print("scene1 - exit end") end

If I create a 'local' sprite 'onTransitionInBegin' ... I can't access it from inside 'onTransitionInEnd'

Do I have to make the sprite global?

Thank you heaps for any help!

hgy29

If you want your lightSwitch Sprite to be accessible throughout your Scene1 instance, then you should make it a member of the instance:

self.lightSwitch = LightSwitch.new(...)

Ninjadoodle

Thank you for the explanation. I'm assuming that 'self.' is similar to 'this.' in javascript?

hgy29

Yes, it is the same concept. One of the most confusing things in lua is that it is not object oriented at all at first sight. There are no such things as classes or instances, only tables. No methods, only functions.
But you can make it act as if it was object-oriented, pretty much like in javascript.
To me, the most important thing to know when dealing with classes/objects is lua is the following equivalence (notice the use of dot or colon depending on the construct) :

function SomeClass:someMethod(a)

is the same as

SomeClass.someMethod=function(self,a)

And similarility the two follings line are the same:

SomeClass.someMethod(SomeClass,a) SomeClass:someMethod(a)

Ninjadoodle

Thanks again for the explanation!