transition object twice? (Corona SDK)

Question

i have a problem with transitioning! For example: i have an object and a button. I want this object to fade out when i press the button, and then when i press the button again i want my object to fade in. But i can't fade in my object, feels like it's just gone! For transition i use transition.to, for ex:

object = transition.to( object, {time=500, alpha=0})

but when i perform another function in this exact scene to fade in, it just don't wanna work at all(button is pressing, but nothing is happening, even errors).

Help me out please!

Answer 1

Your code:

    object = transition.to( object, {time=500, alpha=0})

You are saving the transition handler to the object. Try this:

    trans = transition.to( object, {time=500, alpha=0})

Then if you want to cancel the transition you can do this

    transition.cancel(trans)

you can check the the usage of transition.to here http://developer.coronalabs.com/node/2407

Cheers!

Answer 2

Try this code i don't know correctly but it's works well:

local myRectangle = display.newRect(100, 100, 150, 50)
myRectangle.strokeWidth = 3
myRectangle:setFillColor(140, 140, 140)
myRectangle:setStrokeColor(180, 180, 180)

local button = display.newRect(100, 200, 50, 50)
button.strokeWidth = 3
button:setFillColor(140, 140, 140)
button:setStrokeColor(180, 180, 180)

local buttonfun=function(event)
if event.phase=="ended" then
print("fade")
if myRectangle.alpha ==1.0 then
transition.to( myRectangle, { delay=1, time=1000, alpha=1.0, alpha=0.0} )
myRectangle.alpha=0.0
print("alpha"..myRectangle.alpha)
else
transition.to( myRectangle, { delay=1, time=1000, alpha=0.0, alpha=1.0} )
myRectangle.alpha=1.0
print(myRectangle.alpha)
end
end
return true
end
button:addEventListener("touch", buttonfun)

Answer 3

After you write this trans = transition.to( object, {time=500, alpha=0}) in button pressed first time so you must chick make boolen variable to make this action twice. and second time which fade it in again you must make alpha=1

For example:

local  trans 
function  Listner  (event)
transition.cancel(trans)
trans = nil 
end

function  onPress(event)
if(flage== true) then 

flage = false  
trans = transition.to( object, {time=500, alpha=0 , onComplete =Listner  })

else
flage = true
trans = transition.to( object, {time=500, alpha=1 , onComplete =Listner  })

end