Scene not cleaning up and transitioning?

bigtunacan · April 2016

I have multiple scenes and up until now they have all worked correctly. With the latest scene though it doesn't clean up the scene I'm trying to exit and never gets into the destination scene.

-- This is the source scene
json = require('json')
 
LoadingScene = Core.class(Sprite)
 
local json_loaded = false
 
function LoadingScene:init()
	print("inside loading scene")
 
	local bg = Bitmap.new(Texture.new("images/bg.png"))
	bg:setAnchorPoint(0.5, 0.5);
	bg:setPosition(conf.width/2, conf.height/2)
	self:addChild(bg)
 
	-- Setup loading spinner
	local texture = Texture.new("images/spinner.png")
	local bitmaps = {}
 
	local len = 10
	for i=1, 19 do
		bitmaps[#bitmaps+1] = {(i-1)*len+1, i*len, Bitmap.new(TextureRegion.new(texture, 0, (i-1)*108, 108, 108))}
	end
 
	local mc = MovieClip.new(bitmaps)
	mc:setGotoAction(19*len, 1)
	mc:gotoAndPlay(1)
 
	mc:setPosition(conf.width/2 - 54, conf.height/2 - 54) -- TODO: Offset by image width
 
	self:addChild(mc)
 
	local aboutText = TextWrap.new("Loading", 100, "justify", 5, conf.fontMedium)
	aboutText:setTextColor(0xffff00)
	aboutText:setPosition(conf.width/2 - 50, conf.height/2 + 100)
	self:addChild(aboutText)
	-- END : Setup loading spinner
 
	local f = io.open("|R|data_files/" .. conf.current_cardset.path, "r")
	local data = f:read("*all")
	conf.data = json.decode(data)
	f:close()
	json_loaded = true
 
	-- run world
	self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self)
	self:addEventListener("enterEnd", self.onEnterEnd, self)	
end
 
function LoadingScene:onEnterEnd()
	if json_loaded then
		print("json was loaded")
		--mc.stop()
		sceneManager:changeScene("cards", conf.transitionTime, conf.transition, conf.easing)
	end
end
 
function LoadingScene:onEnterFrame()
 
end

-- Destination scene
 
CardsScene = Core.class(Sprite) 
 
function CardsScene:init()
	print('inside cards scene')
 
	local bg = Bitmap.new(Texture.new("images/bg.png"))
	bg:setAnchorPoint(0.5, 0.5);
	bg:setPosition(conf.width/2, conf.height/2)
	self:addChild(bg)
 
	local aboutText = TextWrap.new("This is the cards scene...", 600, "justify", 5, conf.fontSmall)
	aboutText:setTextColor(0xffff00)
	aboutText:setPosition(100, 200)
	self:addChild(aboutText)
	-- TODO: Add init logic here
 
	-- run world
	self:addEventListener(Event.ENTER_FRAME, self.onEnterFrame, self)
end
 
function CardsScene:onEnterFrame()
    --	print('about frame entered.')
end

ar2rsawseen · April 2016

I think the problem is that onEnterEnd was executed before json was loaded, and that is why nothing really changes.
Also by making json_loaded outside the class, once you set it to true, it never goes back to false.

bigtunacan · April 2016

@ar2rsawseen,

Thanks. I moved it to the

ENTER_FRAME

event listener instead and switched it to use an an instance variable of

 json_loaded

that gets set in init. It is working correctly now.

ar2rsawseen · April 2016

Moving it to ENTER_FRAME might also be bad, make sure you don't execute it multiple times

bigtunacan · April 2016

@ar2rsawseen,

Yep; it's only executing once.

I added

self.ok_to_transition = false

in the init. Then I'm setting this to true onEnterEnd. The onEnterFrame checks for both json_loaded and ok_to_transition.

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