Timeline.cs

public class Timeline
{

    int currentFrame = 0;
    public int CurrentFrame
    {
        get { return currentFrame; }
        set { currentFrame = value; }
    }
    Dictionary<int, List<Action>> frames = new Dictionary<int, List<Action>>();
    Dictionary<int, List<TimedState>> states = new Dictionary<int, List<TimedState>>();

    internal void AddAction(Action action)
    {
        if (!frames.ContainsKey(currentFrame))
        {
            frames[currentFrame] = new List<Action>();
        }
        frames[currentFrame].Add(action);
    }
    public void ProcessFrame()
    {
        List<Action> frame;
        if (frames.TryGetValue(currentFrame, out frame))
        {
            frame.ForEach((action) =>
            {
                action.Timed.ProcessAction(action);
            });
        }
    }
    public void RecordCurrentState(List<TimedState> currentState){
        states[currentFrame] = currentState; 
    }
    internal void AddSerielizedState(TimedState state)
    {
        if(!states.ContainsKey(currentFrame)){
            states[currentFrame] = new List<TimedState>(); 
        }
        states[currentFrame].Add(state); 
    }
    public int SetStateToClosestFrame(int frame){
        while(frame > 0 && !states.ContainsKey(frame)){
            frame--; 
        }
        currentFrame = frame; 
        states[currentFrame].ForEach((state)=>{
            state.Target.Hydrate(state.Data); 
        });
        return frame; 
    }
    public bool HasStateAtFrame(int frame){
        return states.ContainsKey(frame); 
    }
    public void RemoveStateAtFrame(int frame){
        states.Remove(frame); 
    }
}