CODEWITHSUNDEEP
luacoronasdk
user1597438
user1597438

Reputation: 2231

Detecting object touch in corona

In one class, I have 2 "buttons" which are calling 2 classes like so:

btn1 = display.newImage("1.png")
btn2 = display.newImage("2.png")
btn1:addEventListener("touch", onSceneTouch)
btn2:addEventListener("touch", onSceneTouch2)

The problem with this is that the 2 methods (onSceneTouch, onSceneTouch2) do the same thing. The only difference is that it sets a flag depending on which button is touched. My methods look like this:

function onSceneTouch(  event )
//do something here     
end

I've tried searching and I found this article and tried to follow it. I added an id to the buttons and called them on my method but the id was nil. If I try to set a name for the button instead like: btn1.name = "name" and call self.name on my method but of course, the name returned "touch". How would I tell my method which button was touched?

Upvotes: 0

Views: 1642

Answers (3)

AbaEesa
AbaEesa

Reputation: 998

enter code hereUse single event listener & identify who called this using unique name eg

 function onSceneTouch(  event )
        local objectName=event.target.name    
        if objectName==1 then
            flag1=true
        else
            flag2=true 
        end


    end

btn1 = display.newImage("1.png")
btn1.name=1

btn2 = display.newImage("2.png")
btn1.name=2


btn1:addEventListener("touch", onSceneTouch)
btn2:addEventListener("touch", onSceneTouch)

Upvotes: 0

Rob Miracle
Rob Miracle

Reputation: 3063

I know answer 1's example should work just fine, but it's a bit more work than doing a function listener instead of a table listener. I would have written it like this:

function onSceneTouch(event)
    local target = event.target  -- this is the actual button that was touched.
    if event.phase == "ended" then
         -- do your work here 
         print(target.id) -- prints "Button1" or "Button2"
    end
    return true -- important!
end

btn1 = display.newImage("1.png")
btn2 = display.newImage("2.png")
btn1.id = 'Button1'
btn2.id = 'Button2'
btn1:addEventListener("touch", onSceneTouch)
btn2:addEventListener("touch", onSceneTouch)

Same thing different way.

Upvotes: 1

Egor Skriptunoff
Egor Skriptunoff

Reputation: 23767

According to the article you linked to, your code should look like this: 

function onSceneTouch(self, event)
  local button_id = self.id
  --do something here     
end
btn1 = display.newImage("1.png")
btn2 = display.newImage("2.png")
btn1.id = 'Button1'
btn2.id = 'Button2'
btn1.touch = onSceneTouch
btn2.touch = onSceneTouch
btn1:addEventListener("touch")
btn2:addEventListener("touch")

Doesn't it work?

Upvotes: 2

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