WindowHandler.GetID C# (CSharp) Method

    public int GetID(int id)
    {
        // check old id and update timestamp
        if(id >= 0 && list.ContainsKey(id))
        {
            list[id] = Time.time;
        }
        // get new id
        else
        {
            id = this.freeID;
            this.freeID++;
            this.list.Add(id, Time.time);
        }
        return id;
    }