Adding Event Listeners with a for loop

Ninjadoodle

Hi guys

I have a number of bitmaps declared like this …

local segmentA0 = Bitmap.new(Texture.new("images/heartOfTheDiamondPropDiamondSegmentA.png", true))
segmentA0:setAnchorPoint(0.5, 0.5)
local segmentA1 = Bitmap.new(Texture.new("images/heartOfTheDiamondPropDiamondSegmentA.png", true))
segmentA1:setAnchorPoint(0.5, 0.5)
etc …

and adding listeners in the same manner …

segmentA0:addEventListener(Event.MOUSE_UP, rotateSegment, segmentA0)
segmentA1:addEventListener(Event.MOUSE_UP, rotateSegment, segmentA1)
etc …

I'm trying to add Event Listeners to these images using a for loop but can't seem to work out the syntax

If anyone could help that would be awesome

Thank you in advance!

hgvyas123

this is the what i am doing if you can post full code i can chk what is causing the problem

myImageList = {"img1.png","img2.png","img3.png"} for i=1,#myImageList do   local myImg = Bitmap.new(Texture.new(myImageList[i])) self:addChild(myImg) myImg:addEventListener(Event.MOUSE_DOWN,onBtnDown,myImg) myImg:addEventListener(Event.MOUSE_MOVE,onBtnMove,myImg) myImg:addEventListener(Event.MOUSE_UP,onBtnUp,myImg) end

Ninjadoodle

@hgvyas123 Thanks for you help!

The problem is that I'm also adding the images to a group which makes it more complex.

In your example, I don't understand how you would reference the images you create, if you wanted to change any properties at a later time.

Also, I'd love to consolidate my code a little bit if possible I'm sure there is a shorter way to write this up - any help would be awesome!

************************************

-- CREATE/ADD SEGMENT IMAGES
local segmentA0 = Bitmap.new(Texture.new("images/heartOfTheDiamondPropDiamondSegmentA.png", true))
segmentA0:setAnchorPoint(0.5, 0.5)
local segmentB0 = Bitmap.new(Texture.new("images/heartOfTheDiamondPropDiamondSegmentB.png", true))
segmentB0:setAnchorPoint(0.5, 0.5)
local segmentC0 = Bitmap.new(Texture.new("images/heartOfTheDiamondPropDiamondSegmentC.png", true))
segmentC0:setAnchorPoint(0.5, 0.5)
local segmentD0 = Bitmap.new(Texture.new("images/heartOfTheDiamondPropDiamondSegmentD.png", true))
segmentD0:setAnchorPoint(0.5, 0.5)

-- CREATE/ADD DIAMOND-A GROUP
local diamondA = Sprite.new()
self:addChild(diamondA)
diamondA:setPosition(240,96)

-- ADD SEGMENTS TO GROUP
diamondA:addChild(segmentA0)
segmentA0:setPosition(0,-32)
segmentA0:setRotation(45)
segmentA0:setSize(64,64)
diamondA:addChild(segmentB0)
segmentB0:setPosition(32,0)
segmentB0:setRotation(45)
segmentB0:setSize(64,64)
diamondA:addChild(segmentC0)
segmentC0:setPosition(0,32)
segmentC0:setRotation(45)
segmentC0:setSize(64,64)
diamondA:addChild(segmentD0)
segmentD0:setPosition(-32,0)
segmentD0:setRotation(45)
segmentD0:setSize(64,64)

-- ROTATE SEGMENTS
local function rotateSegment(target, event)
if target:hitTestPoint(event.x, event.y) then
if (not target.isTweening) then
clickWav:play()
target.isTweening = true
segmentTween = GTween.new(target, .25, {rotation = target:getRotation()+90}, {ease = easing.outBack})
segmentTween.onComplete = function ()
target.isTweening = false;
end
end
end
end

segmentA0:addEventListener(Event.MOUSE_UP, rotateSegment, segmentA0)
segmentB0:addEventListener(Event.MOUSE_UP, rotateSegment, segmentB0)
segmentC0:addEventListener(Event.MOUSE_UP, rotateSegment, segmentC0)
segmentD0:addEventListener(Event.MOUSE_UP, rotateSegment, segmentD0)

hgvyas123

hi

in this case what you are doing is fine in the case you wanted to use the for loop then add all the sprites in one array and iterate through it to use for loop but according to me it is fine currently

ar2rsawseen

How about functions?

function processSegment(image, parent, x, y) local segment = Bitmap.new(Texture.new(image, true)) segment:setAnchorPoint(0.5, 0.5) parent:addChild(segment) segment:setPosition(x, y) segment:setRotation(45) segment:setSize(64,64) return segment end   -- CREATE/ADD DIAMOND-A GROUP local diamondA = Sprite.new() self:addChild(diamondA) diamondA:setPosition(240,96)   --process segments local segmentA0 = processSegment("images/heartOfTheDiamondPropDiamondSegmentA.png", diamondA, 0,-32) --etc

Ninjadoodle

Thank you guys

Still learning the ropes and trying to get a little bit more efficient with my code.

Your example will help me cut it down quite a bit!

Thanks again!

Mells

Just looking quickly but unless I'm mistaken I think you need to add a "return segment" at the end of the processSegment() function so you can use it later (segmentA0 = processSegment).

@Ninjadoodle

Still learning the ropes and trying to get a little bit more efficient with my code.

If you take time to look at the libs available in the tools section, you'll learn even faster. (Lot of them written by @ar2rsawseen by the way).

Good luck!

Ninjadoodle

Thanks, I'll have a look

ar2rsawseen

@Mells true, corrected it