Need Help

markus · July 2012

Hi all. I am new here. I try to combine two examples Ebook template and example project under Hardware -- "Keyboard"
I just copy the code from Hardware/Keyboard example into sceneController.lua. So when I try to print out any message erevything is ok
function onKeyDown(event)
if event.keyCode == KeyCode.LEFT then
print("menu Button Down")
end
end

But when when I try to move, for example self.left button the APPLICATION՝ player, terminated (closed)
function onKeyUp(event)
if event.keyCode == KeyCode.LEFT then
print ("menu Button Up")
self.left:setPosition(100, 100)
end
end
Please help me to understand what is wrong, seems I cant do anything with other objects on the stage

zvardin · July 2012

My guess is you aren't passing in a copy of self when you register the event listener. There is no automatic reference to self in Lua. When you call a function using a colon, there is a reference to self automatically passed in as a hidden parameter.

The addEventListener function allows you to pass in additional data however, so you can do something like this:

something:addEventListener(Event.KEY_DOWN, onKeyDown, something)

zvardin · July 2012

@markus: Try taking a look at the Button example. You will see in the init function of the class all the addEventListener calls pass in a reference to themselves.

talis · July 2012

please write here the lua error.
Don't forget that lua files are processed from up to down. If you are trying to alter some vaiable out of scope it will raise error. Like before init of a class, trying to use self.left

markus · July 2012

thanks for reply actually there isn't error code, when I press the button player shuts. also if it necessary I can post the whole project.

talis · July 2012

please post if you can.

markus · July 2012

THE WHOLE CODE

sceneController =  gideros.class(Sprite)
 
local keyNames = {
		[KeyCode.BACK] = "back",
		[KeyCode.SEARCH] = "search",
		[KeyCode.MENU] = "menu",
		[KeyCode.CENTER] = "center",
		[KeyCode.LEFT] = "left",
		[KeyCode.UP] = "up",
		[KeyCode.RIGHT] = "right",
		[KeyCode.DOWN] = "down",
}
local pages = {}
pages[1] = "Page0"
pages[2] = "Page1"
pages[3] = "Page2"
pages[4] = "Page3"
pages[5] = "Page4"
local W = application:getContentWidth()
local H = application:getContentHeight()
function onKeyDown(event)
	if event.keyCode == KeyCode.LEFT then
		print("menu Button Down")
	end
end
--"up"
function onKeyUp(event)
if event.keyCode == KeyCode.LEFT then		
print ("menu Button Up")	
GTween.new(self.menugroup, 2, {y = -H/2}, {delay = 0, ease = easing.inBounce, repeatCount = 1, reflect = true})	
end 
end
stage:addEventListener(Event.KEY_DOWN, onKeyDown, self)
stage:addEventListener(Event.KEY_UP, onKeyUp, self)
 
function sceneController:init()
	self.scenes = SceneManager.new({ --scenes are defined
	["Page0"] = Page0, 	
	["Page1"] = Page1,
	["Page2"] = Page2,
	["Page3"] = Page3,
	["Page4"] = Page4,
})
--menu
--music = Sound.new("sound/music4.mp3")	
--local channel  = music:play(0, 1000)
--channel:setVolume(0.4)	
self:addChild(self.scenes)
-- add the first page
self.scenes:changeScene("Page0")
self.pageNo = 1
-- this is the button on the left. to go back
--self.left = Button.new(Bitmap.new(Texture.new("gfx/left-up.png")), Bitmap.new(Texture.new("gfx/left-down.png")))
--self.left:setPosition(leftx, lefty)
--self:addChild(self.left)
-- thins is the button on the right, to go fprward. 
--self.right = Button.new(Bitmap.new(Texture.new("gfx/right-up.png")), Bitmap.new(Texture.new("gfx/right-down.png")))
--self.right:setPosition(rightx, righty)
--self:addChild(self.right)
-- "click" event is mapped to the function of scenecontroller, self.leftClick
-- when the "click" event is pressed, this function will be called.
--self.left:addEventListener(Event.MOUSE_DOWN, self.leftClick, self)
--self.right:addEventListener("click", self.rightClick, self) 
--self.right:addEventListener(Event.MOUSE_DOWN, self.rightClick, self)
--INFO MENU GROUP
self.menugroup = Sprite.new()
 
self.homebtn = Button.new(Bitmap.new(Texture.new("gfx/homebtn.png")), Bitmap.new(Texture.new("gfx/homebtn.png")))
self.homebtn:setPosition(W/2-self.homebtn:getWidth()*1.5, 0)
self.homebtn:addEventListener(Event.MOUSE_DOWN, self.homebtnClick, self)
 
self.authorbtn = Button.new(Bitmap.new(Texture.new("gfx/authorbtn.png")), Bitmap.new(Texture.new("gfx/authorbtn.png")))
self.authorbtn:setPosition(W/2-self.authorbtn:getWidth()/2, 0)
--self.authorbtn:addEventListener(Event.MOUSE_DOWN, self.authorbtn, self)
 
self.aboutbtn = Button.new(Bitmap.new(Texture.new("gfx/aboutbtn.png")), Bitmap.new(Texture.new("gfx/aboutbtn.png")))
self.aboutbtn:setPosition(W/2+self.aboutbtn:getWidth()*0.5, 0)
--self.aboutbtn:addEventListener(Event.MOUSE_DOWN, self.aboutbtn, self)
 
self.closebtn = Button.new(Bitmap.new(Texture.new("gfx/closebtn.png")), Bitmap.new(Texture.new("gfx/closebtn.png")))
self.closebtn:setPosition(W/2-self.closebtn:getWidth()*3.5, -self.closebtn:getHeight()/2)
self.closebtn:addEventListener(Event.MOUSE_DOWN, self.closebtnClick, self)
 
self.menugroup:addChild(self.homebtn)
self.menugroup:addChild(self.authorbtn)
self.menugroup:addChild(self.aboutbtn)
self.menugroup:addChild(self.closebtn)
 
--SHARE MENU GROUP
sharetitle = "AppcodingEasy.com - Share button in Gideros app"
shareurl = "<a href="http://appcodingeasy.com/Gideros-Mobile/Share-button-in-Gideros-app&quot" rel="nofollow">http://appcodingeasy.com/Gideros-Mobile/Share-button-in-Gideros-app&quot</a>;
sharer = Share.new(sharetitle, shareurl)
self.fbbutton = sharer:getButton("facebook")
self.fbbutton:setPosition(W/2-self.fbbutton:getWidth(), 0-self.fbbutton:getHeight()/2)
self.twbutton = sharer:getButton("twitter")
self.twbutton:setPosition(W/2, 0-self.fbbutton:getHeight()/2)
self.menugroup:addChild(self.fbbutton)
self.menugroup:addChild(self.twbutton)
self:addChild(self.menugroup)
 
--INFO BUTTON
self.infobtn = Button.new(Bitmap.new(Texture.new("gfx/infobtn.png")), Bitmap.new(Texture.new("gfx/infobtn.png")))
self.infobtn:setPosition(W/2-self.infobtn:getWidth()/2-self.infobtn:getWidth(), H-self.infobtn:getHeight())
self:addChild(self.infobtn)
self.infobtn:addEventListener(Event.MOUSE_DOWN, self.infobtnClick, self)
--SOUND BUTTON
self.soundbtn = Button.new(Bitmap.new(Texture.new("gfx/soundonbtn.png")), Bitmap.new(Texture.new("gfx/soundonbtn.png")))
self.soundbtn:setPosition(W/2-self.soundbtn:getWidth()/2, H-self.soundbtn:getHeight())
self:addChild(self.soundbtn)
--self.soundbtn:addEventListener(Event.MOUSE_DOWN, self.soundbtnClick, self)
--SHARE BUTTON
self.sharebtn = Button.new(Bitmap.new(Texture.new("gfx/sharebtn.png")), Bitmap.new(Texture.new("gfx/sharebtn.png")))
self.sharebtn:setPosition(W/2-self.sharebtn:getWidth()/2+self.sharebtn:getWidth(), H-self.sharebtn:getHeight())
self:addChild(self.sharebtn)
--self.sharebtn:addEventListener(Event.MOUSE_DOWN, self.sharebtnClick, self)
end
-- INFO BUTTON CLICK
function sceneController:infobtnClick(event)
if (self.infobtn:hitTestPoint(event.x, event.y) == true) then 
GTween.new(self.menugroup, 2, {y = H/2+40}, {delay = 0, ease = easing.outBounce, repeatCount = 1, reflect = true})
end
end
------------------------
-- CLOSE BUTTON CLICK
function sceneController:closebtnClick(event)
if (self.closebtn:hitTestPoint(event.x, event.y) == true) then		
GTween.new(self.menugroup, 2, {y = -H/2}, {delay = 0, ease = easing.inBounce, repeatCount = 1, reflect = true})
end
end
------------------------
-- HOME BUTTON CLICK
function sceneController:homebtnClick(event)
if (self.homebtn:hitTestPoint(event.x, event.y) == true) then
self.scenes:changeScene(pages[1],1, SceneManager.flipWithFade, easing.inBack)
end
end
------------------------
function sceneController:leftClick()
print(self.pageNo)
self.pageNo = self.pageNo - 1
if self.pageNo < 1 then self.pageNo = 1 end	
print(self.pageNo)
self.scenes:changeScene(pages[self.pageNo],1, SceneManager.fade, easing.inBack) 
end 
function sceneController:rightClick()
self.pageNo = self.pageNo + 1
if self.pageNo > 5 then self.pageNo = 1 end
self.scenes:changeScene(pages[self.pageNo],1, SceneManager.fade, easing.inBack) 
end

markus · July 2012

Thanks again

ar2rsawseen · July 2012

You define event listeners and pass the self reference

stage:addEventListener(Event.KEY_DOWN, onKeyDown, self)
stage:addEventListener(Event.KEY_UP, onKeyUp, self)

out of the scope where self exists, out of the function sceneController:init()

Try putting these eventlisteners inside sceneController:init method

 
function sceneController:init()
self:addEventListener(Event.KEY_DOWN, onKeyDown, self)
self:addEventListener(Event.KEY_UP, onKeyUp, self)

markus · July 2012

Still no luck

at this time it isn't recognized events, I mean even not print messages

ar2rsawseen · July 2012

And if you put something like

print(self)
print(self.left)
print(self.menugroup)

what does it print out?

You can try to put them one by one if player crashes

hnim · July 2012

i think 'self' will be nil. Try put 2evenListener as @ar2rsawseen and add sceneController before your function:

function sceneController:onKeyUp(event)

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