Wow Timers | Lua

timer.lua

if not timers then
    timers = true
    callback_timers = {}

    function TableSize(table)
        local count = 0

        for _,_ in pairs(table) do
            count = count + 1
        end

        return count
    end

    function NewTimer(millis, func)
        local instance = "timer" .. TableSize(callback_timers)
        callback_timers[instance] = {
            frame = CreateFrame("Frame", nil, UIParent),
            callback = func,
            rate = millis / 1000,
            rate_counter = 0
        }

        callback_timers[instance].frame:SetScript("OnUpdate",
            function(self, elapsed)
                callback_timers[instance].rate_counter = callback_timers[instance].rate_counter + elapsed

                if callback_timers[instance].rate_counter > callback_timers[instance].rate then
                    callback_timers[instance].callback()
                    callback_timers[instance].rate_counter = 0
                end
            end
        )

        callback_timers[instance].frame:Show()
        return instance
    end

    function DeleteTimer(timer)
        callback_timers[timer].frame:Hide()
    end
end