Can you send an extra value to an touch eventlistener?

Solar2D General Questions/Discussion
1

Hello,

is it possible to add extra values to an ecentListener?

I am using this at the moment:

[lua]

local function Oefening1(event)

end

oefening.i1:addEventListener(“touch”,Oefening1)

[/lua]

could I add a value and have something like this:

[lua]

local function Oefening1(event,x)

print(x)

end

oefening.i1:addEventListener(“touch”,Oefening1,5)

[/lua]

So it would print the value I am sending with it?

Thanks

2

Never seen it used like that before. I know of a way but it involves more writing

local PrintOef(num) print(num) end   local function Oefening1(event) PrintOef(5) end   oefening.addEventListener( "touch", Oefening1 )

or you can do something like

local function Oefening1(event) local x = event.num print(x) end oefening.num = 5 oefening.addEventListener( "touch", Oefening1 )
3

You can add custom value to the object:

oefening.i1.myCustomValue = 5 oefening.i1:addEventListener("touch",Oefening1)

Your Oefening1 function would be

local function Oefening1(event) print(event.target.myCustomValue) end

Another options is

oefening.i1:addEventListener("touch",function() someFunciton(something) end)
4

@hatethekingofnames

What I want to do is just use one function without a lot of code to navigate.

Now I have a touch event function for each button. Each has a

[lua]

storyboard.gotoScene(“sceneName”)

[/lua]

If I could change the scenename to a variable I send with the eventlistener. I could use just this one function. Now I have 9 each with its own gotoscene. Works well. But would be nice if I could do it in one function.

Having a lot of

[lua]if event.target==1 then scene1

[/lua]

is a solution I don’t wan’t still a lot of code and doesn’t look a lot better.

Thanks @jonjonsson Will try that.

5

Give each of your oefening’s a custom value like jonjonsson said

oefening1.scene = 1 oefening2.scene = 2 --etc ..or you can even give them the entire name directly like oefening1.scene = "Level1" oefening2.scene = "Level2" -- not sure if its supposed to be with quotes or not but probably quotes

then

local sceneName = event.scene storyboard.gotoScene( sceneName )
6

Thanks,

it worked. Code will look a lot cleaner now.

7

Hello Juf, take a look at the last post in this thread:

http://forums.coronalabs.com/topic/28413-is-there-a-way-to-pack-extra-info-in-the-touch-event-table/

It can be handy too if you need to pass several parameters; it’s not too easy to understand at first (at least it wasn’t for me) but when you get it it is kinda useful.

8

Thanks will look at it.

9

Never seen it used like that before. I know of a way but it involves more writing

local PrintOef(num) print(num) end   local function Oefening1(event) PrintOef(5) end   oefening.addEventListener( "touch", Oefening1 )

or you can do something like

local function Oefening1(event) local x = event.num print(x) end oefening.num = 5 oefening.addEventListener( "touch", Oefening1 )
10

You can add custom value to the object:

oefening.i1.myCustomValue = 5 oefening.i1:addEventListener("touch",Oefening1)

Your Oefening1 function would be

local function Oefening1(event) print(event.target.myCustomValue) end

Another options is

oefening.i1:addEventListener("touch",function() someFunciton(something) end)
11

@hatethekingofnames

What I want to do is just use one function without a lot of code to navigate.

Now I have a touch event function for each button. Each has a

[lua]

storyboard.gotoScene(“sceneName”)

[/lua]

If I could change the scenename to a variable I send with the eventlistener. I could use just this one function. Now I have 9 each with its own gotoscene. Works well. But would be nice if I could do it in one function.

Having a lot of

[lua]if event.target==1 then scene1

[/lua]

is a solution I don’t wan’t still a lot of code and doesn’t look a lot better.

Thanks @jonjonsson Will try that.

12

Give each of your oefening’s a custom value like jonjonsson said

oefening1.scene = 1 oefening2.scene = 2 --etc ..or you can even give them the entire name directly like oefening1.scene = "Level1" oefening2.scene = "Level2" -- not sure if its supposed to be with quotes or not but probably quotes

then

local sceneName = event.scene storyboard.gotoScene( sceneName )
13

Thanks,

it worked. Code will look a lot cleaner now.

14

Hello Juf, take a look at the last post in this thread:

http://forums.coronalabs.com/topic/28413-is-there-a-way-to-pack-extra-info-in-the-touch-event-table/

It can be handy too if you need to pass several parameters; it’s not too easy to understand at first (at least it wasn’t for me) but when you get it it is kinda useful.

15

Thanks will look at it.