Hi,
I tried for a while but I didn’t find a solution to this:
Say I have several small images on the screen. And i want them to print their position when they get tapped.
It’s easy for one single image:
[lua]circle = display.newCircle(20, 20, 20)
function circle:tap(event)
print(circle.x…"/"…circle.y)
end
circle:addEventListener(“tap”, circle)[/lua]
But what if I have something like this:
[lua]circle1 = display.newCircle(20, 20, 20)
circle2 = display.newCircle(60, 20, 20)
circle3 = display.newCircle(100, 20, 20)
circle4 = display.newCircle(140, 20, 20)
circle5 = display.newCircle(180, 20, 20)[/lua]
I don’t want to define five different listeners since they would all do the same. So is there a way to define the listener once and reuse it in multiple tap-events? [import]uid: 24216 topic_id: 5732 reply_id: 305732[/import]
Ok, got it.
[lua]local circleTapped = function(event)
local circle = event.target
print(“Tapped circle at: “…circle.x…”/”…circle.y)
end
circle1 = display.newCircle(20, 20, 20)
circle1:addEventListener(“tap”, circleTapped)
circle2 = display.newCircle(60, 20, 20)
circle2:addEventListener(“tap”, circleTapped)
circle3 = display.newCircle(100, 20, 20)
circle3:addEventListener(“tap”, circleTapped)
circle4 = display.newCircle(140, 20, 20)
circle4:addEventListener(“tap”, circleTapped)
circle5 = display.newCircle(180, 20, 20)
circle5:addEventListener(“tap”, circleTapped)[/lua]
Was too easy. 
[import]uid: 24216 topic_id: 5732 reply_id: 19631[/import]
Hi Fly,
I need to pass arguments to the function which is called when
an event is fired…
TRectangle1:addEventListener(“touch”,common)
Here i need to pass three args to the “common” function.
how can i do so.
i tried this
TRectangle1:addEventListener(“touch”,function(event){ common(“TRectangle1”,“GblRectPosX1”,“GblRectPosY1”) })
but it gives me an error…
Thankx
Krunal. [import]uid: 33757 topic_id: 5732 reply_id: 21633[/import]
I don’t know if there’s a better solution to this since I’m new to Lua, but I’m doing it like this in my code:
[lua]local common = function(event)
local rec = event.target – the object that triggerd the event
xpos = rec.GblRectPosX1
ypos = rec.GblRectPosY1
…
end
TRectangle1.GblRectPosX1 = xx
TRectangle1.GblRectPosY1 = yy
TRectangle1:addEventListener(“touch”,common)[/lua] [import]uid: 24216 topic_id: 5732 reply_id: 21678[/import]
Hi Fly,
Thankx for reply,
But i hv 5 rectangle and i wannt to work with only one Listener so no need to add extra Listener for another 4 like we hv make one click event for different button and as per sender object we find the id and do operation on same.
is it possible in Lua ?
Krunal [import]uid: 33757 topic_id: 5732 reply_id: 21680[/import]
But you can use the same listener on every of your rectangels:
[lua]local common = function(event)
local rec = event.target – the object that triggerd the event
xpos = rec.GblRectPosX
ypos = rec.GblRectPosY
…
end
TRectangle1.GblRectPosX = xx
TRectangle1.GblRectPosY = yy
TRectangle1:addEventListener(“touch”,common)
TRectangle2.GblRectPosX = xx
TRectangle2.GblRectPosY = yy
TRectangle2:addEventListener(“touch”,common)
TRectangle3.GblRectPosX = xx
TRectangle3.GblRectPosY = yy
TRectangle3:addEventListener(“touch”,common)[/lua] [import]uid: 24216 topic_id: 5732 reply_id: 21684[/import]
You can use a table for your listener instead of a function:
http://developer.anscamobile.com/content/application-programming-guide-event-handling#Listeners_and_Event_Delivery
Then make sure to have a function called “touch” in the table. Now you can stick whatever values you want in the table and they will be accessible in the function:
[code]
local t = {}
function t:touch(event)
print(self.val)
end
t.val = 2
button:addEventListener(“touch”, t)
[/code] [import]uid: 12108 topic_id: 5732 reply_id: 21696[/import]
Hi Flyer,
Thankx for your reply its too helpfull for me.
But I want to Use User define function but i m getting error when i am call the function here I am giving you my code sample :
local common = function(event)
local rec = event.target – the object that triggerd the event
xpos = rec.GblRectPosX
ypos = rec.GblRectPosY
rec.text = “Y”
CheckForCount() – User Define Function
end
– Function for check the value
local function CheckForCount()
Print(TRectangle1.text)
end
TRectangle1.GblRectPosX = xx
TRectangle1.GblRectPosY = yy
TRectangle1.text = “Hello”
TRectangle1:addEventListener(“touch”,common)
TRectangle2.GblRectPosX = xx
TRectangle2.GblRectPosY = yy
TRectangle2:addEventListener(“touch”,common)
TRectangle3.GblRectPosX = xx
TRectangle3.GblRectPosY = yy
TRectangle3:addEventListener(“touch”,common)
is It OK…or give me way where I am going to wrong…
Thankx
Krunal [import]uid: 33757 topic_id: 5732 reply_id: 21925[/import]