Defold, Lua timer module

timer.lua

-- A timer module for Defold, supports a regular timer and a repeating timer,
-- timer fires its callback once, the repeating timer fire its callback until it is canceled


-- Locals
local M = {}

------------------------------------------------------------------------------
function M.create()
	local self = {}
	self.timers = {}	
	return self
end


------------------------------------------------------------------------------
function M.cancel_all(self)
	for index = #self.timers, 1, -1  do	
		table.remove(self.timers, index)
	end
end


------------------------------------------------------------------------------
function M.add_timer(self, time_out, callback_func, args)
	local timer = {}
	timer.time_left = time_out
	timer.callback = callback_func
	timer.args = args
	table.insert(self.timers, timer)	
end


------------------------------------------------------------------------------
function M.add_repeating_timer(self, time_out, callback_func, args)
	local timer = {}
	timer.time_left = time_out
	timer.repeat_every = time_out
	timer.callback = callback_func
	timer.args = args
	table.insert(self.timers, timer)	
end

------------------------------------------------------------------------------
function M.update(self, dt)
	local triggered_timers = {}	
	
	for index = #self.timers, 1, -1  do	
		self.timers[index].time_left = self.timers[index].time_left - dt
		if self.timers[index].time_left <= 0.0 then
			table.insert(triggered_timers, self.timers[index])
			
			if self.timers[index].repeat_every ~= nil then
				self.timers[index].time_left = self.timers[index].repeat_every
			else
				table.remove(self.timers, index)
			end
		end
	end
	
	for index = #triggered_timers, 1, -1 do
		triggered_timers[index].callback(triggered_timers[index].args)		
	end	
end 


return M