How to setup a sprite to return id on mouse/touch event?

arjunr24724 · January 2013

Hi.
I've been trying to use OO in Gideros. So I created a "bubble" class from Bitmap as my sprite class, and created a local var "id" in the class.

I then used a for loop to generate an array of bubbles and stored an id to each bubble.
In the bubble class, when I called print(id) on touch/mouse event, it triggered every bubble's event function, and also returned the same id for every bubble.

Eg: (unnecessary code removed)
Bubble class:
GCbubble = gideros.class(Bitmap)
local myId = 0;

function GCbubble:onMouseDown(event)
print(myId);
end

Level Class:
function GClevel:setupLevel()
for i=1, cols*rows, 1 do
bubbleArray[i]=GCbubble.new(Texture.new("char.png"));
bubbleArray[i]:setId(i);
sceneCamera:addChild(bubbleArray[i]);
end

If the loop generates10 bubbles and I touch any 1 of them, i get "10" printed 10 times due to each bubble triggering the function.

Any way I can only make the touched bubble return its id?

ar2rsawseen · January 2013

Firstly to trigger only specific touched bubble even, you need to use it like this:

function GCbubble:onMouseDown(event)
    if self:hitTestPoint(event.x, event.y) then
        print(myId);
    end
end

But it seems that you are storing id locally for all the bubbles, if you want to have each bubble it's own id, you should store it like class property

function GCbubble:init()
    self.id = 0
end
 
function GCbubble:setId(i)
    self.id = i
end
 
function GCbubble:onMouseDown(event)
    if self:hitTestPoint(event.x, event.y) then
        print(self.id)
    end
end

arjunr24724 · January 2013

Thanks.

Just stumbled onto the soln myself (after scratching my head for the past couple of hrs), and your soln is exactly what I ended up doing =D>

OZApps · January 2013

you might also want to use the

event:stopPropogation()

after the

print(self.id)

while it might not make much of a difference but it can save you a bit when you have a couple of handlers and the events trigger each of the handlers.

arjunr24724 · January 2013

thanks. good to know and i think important to implement right from the start.

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