Delay or Wait

xGuilt · July 2013

How do you add some kind of way for the system to wait before running the next line of code?

What i'm trying to do is, when the scene enters, the background would already be visible but will wait for let's say 2 or 3 seconds before showing some of the objects. Also i was planning on using the delay or wait to somehow prevent some function from running for 1 or 2 seconds...

OZApps · July 2013

This is something I asked Roberto around January 2012,
and the response I got, this however does not work with GUI based nor does

sleep(nn)

I am also looking for the perfect solution that I am not yet able to get, the logical thing that I can think of is to construct a stack with instructions and execute them accordingly, which would dispatch a DONE event to go to the next instruction.

The

while do .. end

loops can freeze/hang so they are no good, there is no

DoEvents()

like in Visual Basic

If you do not mind, would you be able to help with some code block on how to have a loop that does not go to the next line until it finishes execution?
--in pseudo code
--
 
theStatus = false
callAFunction()
while theStatus==false do
 --wait for theStatus to turn to true
end
--now we can proceed
callNextFunction()
Have a look at "Programming in Lua":

http://www.lua.org/pil/9.4.html

-- Roberto

Mells · July 2013

@xGuilt how relevant to your question is the following ?

local function displayObjects()
      -- Do something here
end
local timer = Timer.delayedCall(3000, displayObjects)

petec · July 2013

@xGuilt I do what @Mells suggests when I need to delay something. The only thing you need to do is make sure that you stop the timer when you leave the scene as otherwise, if you leave the scene before the timer has run its time, the timer seems to keep running and the action can happen in the next scene when time is up - at least, that's what I've found.

xGuilt · July 2013

@xGuilt how relevant to your question is the following ?

local function displayObjects()
      -- Do something here
end
local timer = Timer.delayedCall(3000, displayObjects)

I've tried it but somehow, what's inside the function is not happening? Did i do something something wrong?

EDIT: nevermind, found out the problem. btw does this mean i have to create multiple timer if i want several timed event?

ar2rsawseen · July 2013

@xGuilt if they are in separate time intervals and can't be synced then yes. But Timer class is quite flexible, you can dispatch single Timed events:

local function displayObjects()
      -- Do something here
end
local timer = Timer.delayedCall(3000, displayObjects)

You can make Timer run indefinitely (until you stop it):

local function displayObjects()
      -- Do something here
end
local timer = Timer.new(3000)
timer:addEventListener(Event.TIMER, displayObjects)
timer:start()

Or you can run Timer specified amount of times

local function displayObjects()
      -- Do something here
end
local timer = Timer.new(3000, 10) --running timer 10 times with 3000 milisecond delays
timer:addEventListener(Event.TIMER, displayObjects) --is dispatched on every timer tick
timer:addEventListener(Event.TIMER_COMPLETE, displayObjects) --is dispatched when all 10 times are up
timer:start()

xGuilt · July 2013

@Mells i almost forgot to thank you for the code, works like a charm.

@ar2rsawseen oh, but it seems like single timed events works perfectly since i'm only using it for a brief pause before a certain scene starts so it appears as i won't be using as much timer as i thought i would.

since i'm in the topic of delay or waiting, i've recently encountered a new problem (i'm a problematic guy, sorry for that) So yeah, i have this block of code which is a button that when clicked, it shows a popup that has 2 buttons, yes and no.

local A = TextButton.new(conf.smallFont, "Wing", "Wing", Bitmap.new(Texture.new("images/answer_up.png", conf.textureFilter)), Bitmap.new(Texture.new("images/answer_down.png", conf.textureFilter)))
 
   A:addEventListener("click", function()
   self.foregroundLayer:addChild(layer)
   yes:addEventListener("click", accept(stage, "a"))	
   no:addEventListener("click", decline)
   layer:show()
   end)

I got this part cleared already but my problem is that the "yes" button is connected to a function

	local function accept(x, choice)
		if x == "4" then
			if choice == "a" then
			stage = "5b"
			self.foregroundLayer:removeChild(menu)
			print(scene)
			elseif choice == "b" then
			stage = "5a"
			self.foregroundLayer:removeChild(menu)
			elseif choice == "c" then
			stage = "5b"
			self.foregroundLayer:removeChild(menu)
			elseif choice == "d" then
			stage = "5b"
			self.foregroundLayer:removeChild(menu)
			end
		end
 
		return accept
	end

What i had in mind is that the user after choosing from a choice, he will be asked for confirmation of his choice by asking yes or no. Once he clicked yes, the function will get the current stage and the choice of the user then run based on the parameter passed. There is no problem with the parameter, the problem is that the event fires even without clicking the yes button. It runs the moment i click the A button. Any idea as to what is wrong?

EDIT: It seems like this problem only occurs either with functions that takes parameters or if statements. I'm guessing it's the first one.

ar2rsawseen · July 2013

@xGuilt yes you can't pass any data to even handler like that

yes:addEventListener("click", accept(stage, "a"))

But you can do it like that:

yes:addEventListener("click", accept, {stage, "a"})	
local function accept(data)
    print(data[1]) --stage
    print(data[2]) --"a"
end

xGuilt · July 2013

@ar2rsawseen tried it out and it worked nicely. Only problem is that the 'accept' function takes the parameters, the stage and "a" or whatever value it is even though the yes button hasn't been clicked yet. So if i click the button which adds the event listeners to both yes and no buttons. The yes button already gets the parameters and even if i click the no button, the yes would still have passed the params and run the function it's tied to which causes double or even different instance of the function when i finally click yes. Was wondering is it possible that the param would only be passed if i click yes button?

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