LÖVE

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-- love.touchpressed / love.touchmoved / love.touchreleased
-- Those are essential callback function for android touch event handling
-- But those callback functions won't call if you click mouse at PC, so you have to call it manually if you want to call it.

-- Code below will store touch inputs to touches{} table.
-- touches[id] = {x = x coords, y = y coords, time = how much time it got pressed}
-- You can add another informations if you want.

local touches = {}

function love.load()	
    count = 0
end

function love.draw()
	local k, v
	for k, v in pairs(touches) do
		love.graphics.print(tostring(k) .. ":" .. math.floor(v.x) .. ":" .. math.floor(v.y) .. ":".. math.floor(v.time), v.x, v.y)
	end
	love.graphics.print(count, 0, 0)
end

function love.touchpressed(id, x, y)
	touches[id] = {x = x, y = y, time = 0}
	count = count + 1
end

function love.touchmoved(id, x, y)
	if touches[id] ~= nil then
		touches[id].x = x
		touches[id].y = y
	end
end

function love.touchreleased(id, x, y)
	touches[id] = nil
	count = count - 1
end

function love.update(dt)
	-- store time to each touch gestures
	local k, v
	for k, v in pairs(touches) do
		v.time = v.time + dt
	end
end

----- callback function for mouse - for PC -----

function love.mousepressed(x, y, button, istouch)
	if istouch == false then 
		love.touchpressed("mouse", x, y)
	end
end

function love.mousemoved(x, y, dx, dy, istouch)
	if istouch == false then
		if love.mouse.isDown(1) then
			love.touchmoved("mouse", x, y)
		end
	end
end

function love.mousereleased(x, y, button, istouch)
	if istouch == false then
		love.touchreleased("mouse", x, y)
	end
end
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Code: Select all

function love.touchreleased(id, x, y)
	touches[id] = nil
	count = count - 1
	
	-- psudocode warning!
	if button.clicked(button.x, button.y, button.width, button.height, x, y) == true then
		if touches[id].time >= 1 then -- let's assume threshold is 1 sec
			-- long-press
			print("user long-pressed button")
		else
			-- short-tap
			print("user short-tapped button")
		end
	end
end