Modules and Scope of variables

Hi guys,

I am building an application, and I am modularising it, to make it easy to maintain. Everything works fine, but I need some help or pointers in terms of accessing variables in different modules..

For example, I have an image on the screen.. there is a button on the screen.. when the button is pressed the image should dissapear.. pretty easy?

The image is created in the main.lua file, the button is created in a gamefunctions.lua, which has the ontouch event... which is where the issue comes in.. how do I access the image from main in gamefunctions.lua

Thanks in advance

Code posted

main.lua

local gameFunctions = require "gameFunctions"
local btnPressOK = true
local button 
        
-- Create New image
image1 = display.newImage("reload.png")
 
-- Create button which hides and shows image
button = gameFunctions.createButtons()
 
<code>
 
gameFunctions.lua
<code>
 
module(..., package.seeall)
 
local ui = require("ui")
        
function createButton(originX, originY, sizeX, sizeY, imageBtnLocation,imageBtnPressedLocation)                 
                local MenuBtn = ui.newButton{
                defaultSrc = imageBtnLocation,
                defaultX = sizeX,
                defaultY = sizeX,
                overSrc = imageBtnPressedLocation,
                overX = sizeX,
                overY = sizeX,
                text = "",
                font = "Helvetica",
                textColor = { 255, 255, 255, 255 },
                size = 16,
                emboss = false
                }                       
                MenuBtn.x = originX; MenuBtn.y = originY        
                return MenuBtn
        end
        
function onbtnTouch()
 
        print("button Pressed")
        -- when the button is clicked I want image1 to be hidden
        -- how do I access that variable from main
        
        --main.image1.isVisible = false
 
 
end
        
function createButtons()        
                local btn = createButton(450, 300,48, 48, "next.png", "next_p.png")
                btn:addEventListener("tap", onbtnTouch )
                return btn
end
 
                
                
                
 
 
<code>

@vik,
you might want to have a read of the following http://howto.oz-apps.com/2011/09/referencing-multiple-objects-of-same.html

and
http://howto.oz-apps.com/2011/09/scopes-for-functions.html

and
http://howto.oz-apps.com/2011/09/function-scope-answers.html

these should give you a better way to structure your code and make it modular.

cheers,

?:)

hey mate,
thanks for that.. Learnt some new things but it didn't really explain how to access a variable in a different module...

in my original post the code looks like it is in the same file... I just reposted

its in the 'onbtnTouch' function....

main.lua

local gameFunctions = require "gameFunctions"
local btnPressOK = true
local button 
        
-- Create New image
image1 = display.newImage("reload.png")
 
-- Create button which hides and shows image
button = gameFunctions.createButtons()

vik,

That's because you are looking for something specific, not getting the broader/bigger picture.

1. change the gamefunction.lua as following

function createButtons()
   local function createButton(......)
   end
 
   local function onBtnTouch(event)
   end
   
   local btn = createButton(....)
    btn:addEventListener("tap",onBtnTouch)
   return btn
end

Thanks mate... I do appreciate the assistance

viks,
did it work for you?

where are you from? you seem to be a new name on the forums.

cheers

?:)

Hi mate,

Yes it did... but I managed to get a work around using closures had to get something specific...

from melbourne in Australia... and yourself? I am guessing from the company name .. from australia

Vik

I'm from North QLD.

cheers,

?:)

views:1442 update：2011/10/17 8:58:49


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