Unity PlayableDirector(Timeline) 正播倒播处理

控制Timeline的播放状态，官方API中只有正播方法，没有倒播的接口。
自己原本有一个使用协程的方式，每一帧中进行更新，但是协程在处理中途暂停继续播放上比较难处理。所以使用Dotween的方式重新编辑一个。

TimelineHelper.cs ：主要是提供了两个静态接口，用来实现挂TimelineDirector组件

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Playables;
 
namespace Tools
{
   
    public static class PlayableExpansion
    {
   
        /// <summary>
        /// 为director添加自定义控制器
        /// </summary>
        /// <param name="director"></param>
        /// <returns></returns>
        public static PlayableController AddPlayableController(this PlayableDirector director)
        {
   
            return director.gameObject.AddComponent<TimelineDirector>();
        }
 
        /// <summary>
        /// 为obj添加自定义控制器
        /// </summary>
        /// <param name="director"></param>
        /// <returns></returns>
        public static PlayableController AddPlayableController(this GameObject obj)
        {
   
            return obj.AddComponent<TimelineDirector>();
        }
    }
 
 
    public class TimelineHelper
    {
   
        /// <summary>
        /// 创建Timeline控制器
        /// </summary>
        /// <param name="director">PlayableDirector 组件</param>
        public static TimelineDirector CreateTimelineDirector(PlayableDirector director)
        {
   
            Debug.Assert(null != director, "null is director");
            return director.GetComponent<TimelineDirector>() ?? director.gameObject.AddComponent<TimelineDirector>();
        }
 
        /// <summary>
        /// 创建Timeline控制器
        /// </summary>
        /// <param name="directorPath">PlayableDirector 路径</param>
        public static TimelineDirector CreateTimelineDirector(string directorPath)
        {
   
            var director = GameObject.Find(directorPath);
            Debug.Assert(null != director, "null is directorPath");
            return director.GetComponent<TimelineDirector>() ?? director.gameObject.AddComponent<TimelineDirector>();
        }
    }
}

TimelineDirector.cs ：Timeline的相关控制封装，没有用官方播放的API，只用到了PlayableDirector时间和采样(PlayableDirector.time和PlayableDirector.Evaluate())

using System;
using DG.Tweening;
using UnityEngine;
using UnityEngine.Playables;



[RequireComponent(typeof(PlayableDirector))]
public class TimelineDirector : MonoBehaviour
{
   
    #region ENUM
    public enum Status
    {
   
        NULL,
        PLAYING,
        PAUSED,
        STOPPED,
    }

    public enum Direction
    {
   
        NULL,
        FORWARD,
        BACKWARD
    }

    #endregion

    [SerializeField]
    private PlayableDirector m_playableDirector;

    [Range(0f, 1f)]
    public float PlaySpeed = 1f;

    /// <summary>
    /// 播放模式
    /// </summary>
    public WrapMode WrapMode = WrapMode.Once;

    /// <summary>
    /// 开始播放事件, 返回时 时间点，和触发时方向
    /// </summary>
    public Action<double, Direction> OnPlay;

    /// <summary>
    /// 暂停播放事件, 返回时 时间点，和触发时方向
    /// </summary>