Accessing Display Objects

artful.dodger2007 · July 19, 2013, 9:35am

Hi people, first time poster on (any) coding forum. Usually like to go and hunt the problem down myself but as I’m fairly new to Corona/Lua and time is of the essence on this project thought I’d post and see if anyone can point me in the right direction.

I have a for loop that creates display objects based on what part of the game the user is on:

for j=1, numAnswers do

local answerBtnGroup = “quest”…i…“Ans”…j…“Gp”

answerBtnGroup = display.newGroup()

answerName:insert(answerBtnGroup)

– Add background image

local answerBtnName = “quest”…i…“Ans”…j

answerBtnName = display.newSprite(answerBtnGroup, numberBtnSheet, numberBtnSqData)

answerBtnName:setSequence(“normal”)

answerBtnName:setReferencePoint(display.TopLeftReferencePoint)

answerBtnName.y = 0

answerBtnName:setFillColor(236,229,122)

local answerTextName = “quest”…i…“Ans”…j…“Text”

answerTextName = display.newText(answerBtnGroup, “24”, 0, 0, textFont, numberAnswerFontSize)

answerTextName:setReferencePoint(display.TopCenterReferencePoint)

answerTextName.x, answerTextName.y = 0,35

answerTextName:setTextColor(0)

if j == 1 then

answerBtnGroup.x = 0

else

answerBtnGroup.x = (answerBtnName.width + (spacing/4)) * (j-1)

end

– These are supposed to be drag and drop type objects, (boxes with numbers on them), my problem is if they are created inside the for loop how/where do I implement touch events on them with…

function answerBtnGroup:touch( event )

– set up local variables to handle focus on object

local answerBtnGroup = event.target

local phase = event.phase

if event.phase == “began” then

… rest of code

answerBtnGroup:addEventListener(“touch”, answerBtnGroup)

– end

Any help would be greatly appreciated. As a side note, if create the display objects individually the touch event function works…

Thanks

artful.dodger2007 · July 19, 2013, 10:01am

Think I might have it; must have had a brain freeze, declare: local answerBtnGroup before the for loop and

answerBtnGroup:addEventListener(“touch”, answerBtnGroup)

function answerBtnGroup:touch( event )

after it?

Is that correct practice?

horacebury · July 19, 2013, 10:49am

Is this what you’re looking for?

local stage = display.getCurrentStage() local function touch(e) &nbsp;&nbsp;&nbsp;&nbsp;local target, phase, hasFocus, offset = e.target, e.phase, e.target.hasFocus, e.target.offset &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;if (phase == "began") then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;stage:setFocus(target) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;target.hasFocus = true &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;target.offset = {x=e.x-target.x, y=e.y-target.y} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return true &nbsp;&nbsp;&nbsp;&nbsp;elseif (target.hasFocus) then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (phase == "moved") then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;target.x, target.y = e.x-offset.x, e.y-offset.y &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;stage:setFocus(nil) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;target.hasFocus = false &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;end &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return true &nbsp;&nbsp;&nbsp;&nbsp;end &nbsp;&nbsp;&nbsp;&nbsp;return false end for i=1, 10 do &nbsp;&nbsp;&nbsp;&nbsp;local item = display.newGroup() &nbsp;&nbsp;&nbsp;&nbsp;item.index = i &nbsp;&nbsp;&nbsp;&nbsp;item.x, item.y = 100, i\*30 &nbsp;&nbsp;&nbsp;&nbsp;item.rect = display.newRect( item, 0, 0, 100, 20 ) &nbsp;&nbsp;&nbsp;&nbsp;item.rect:setFillColor(100+i\*10,100+i\*10,100+i\*10) &nbsp;&nbsp;&nbsp;&nbsp;item.text = display.newText( item, "Item: "..i, 2, 2, native.systemFont, 12 ) &nbsp;&nbsp;&nbsp;&nbsp;item.text:setTextColor(0,0,0) &nbsp;&nbsp;&nbsp;&nbsp;item:addEventListener("touch",touch) end &nbsp;

artful.dodger2007 · July 19, 2013, 10:01am

Think I might have it; must have had a brain freeze, declare: local answerBtnGroup before the for loop and

answerBtnGroup:addEventListener(“touch”, answerBtnGroup)

function answerBtnGroup:touch( event )

after it?

Is that correct practice?

horacebury · July 19, 2013, 10:49am

Is this what you’re looking for?

local stage = display.getCurrentStage() local function touch(e) &nbsp;&nbsp;&nbsp;&nbsp;local target, phase, hasFocus, offset = e.target, e.phase, e.target.hasFocus, e.target.offset &nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;if (phase == "began") then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;stage:setFocus(target) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;target.hasFocus = true &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;target.offset = {x=e.x-target.x, y=e.y-target.y} &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return true &nbsp;&nbsp;&nbsp;&nbsp;elseif (target.hasFocus) then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (phase == "moved") then &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;target.x, target.y = e.x-offset.x, e.y-offset.y &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;else &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;stage:setFocus(nil) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;target.hasFocus = false &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;end &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return true &nbsp;&nbsp;&nbsp;&nbsp;end &nbsp;&nbsp;&nbsp;&nbsp;return false end for i=1, 10 do &nbsp;&nbsp;&nbsp;&nbsp;local item = display.newGroup() &nbsp;&nbsp;&nbsp;&nbsp;item.index = i &nbsp;&nbsp;&nbsp;&nbsp;item.x, item.y = 100, i\*30 &nbsp;&nbsp;&nbsp;&nbsp;item.rect = display.newRect( item, 0, 0, 100, 20 ) &nbsp;&nbsp;&nbsp;&nbsp;item.rect:setFillColor(100+i\*10,100+i\*10,100+i\*10) &nbsp;&nbsp;&nbsp;&nbsp;item.text = display.newText( item, "Item: "..i, 2, 2, native.systemFont, 12 ) &nbsp;&nbsp;&nbsp;&nbsp;item.text:setTextColor(0,0,0) &nbsp;&nbsp;&nbsp;&nbsp;item:addEventListener("touch",touch) end &nbsp;