How does tap detection work?

Solar2D General Questions/Discussion
#1

Based on Solar2D Documentation — Developer Guides | Events/Listeners, tap is a single action but why does it output 2 values (see example below)?
Sample code:

local function listener(event)
 print("a")
end
text:addEventListener("tap", listener)

Output:

a
a

P.S. Both values are printed at the same time

#2

Your sample code isn’t enough to reproduce the problem. Your problem may be caused by you having attached the same listener to multiple objects and not having a return true at the end to stop tap events from propagating. The tap event listener does only fire once, as the docs state.

local object = display.newRect( 100, 100, 100, 100 )

local function onObjectTap( event )
	print( "a" )
	return true
end

object:addEventListener( "tap", onObjectTap )
1 Like