unity Timeline的Playable脚本

Playabl脚本不使用MonoBehaviour而是BasicPlayableBehaviour，

名字域需要：using UnityEngine.Playables和using UnityEngine.Timeline

Playable中提供有8种方法：

1，OnGraphStart(Playable playable)；

2，OnGraphStop(Playable playable)；

3，PrepareFrame(Playable playable, FrameData info)；

4，ProcessFrame(Playable playable, FrameData info, object playerData)；

5，OnBehaviourPlay(Playable playable, FrameData info)；

6，OnBehaviourPause(Playable playable, FrameData info)；

7，OnPlayableCreate(Playable playable);

8，OnPlayableDestroy(Playable playable);

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Playables;
using UnityEngine.Timeline;

public class SimpleCustomPlayable : BasicPlayableBehaviour
{
    public override void OnGraphStart(Playable playable)
    {
        Debug.Log("Graph start");	
    }

    public override void OnGraphStop(Playable playable)
    {
        Debug.Log("Graph stop");
    }

    public override void PrepareFrame(Playable playable, FrameData info)
    {
        Debug.Log("1");
    }

    public override void ProcessFrame(Playable playable, FrameData info, object playerData)
    {
        Debug.Log("2");
    }

    public override void OnBehaviourPlay(Playable playable, FrameData info){
        Debug.Log("Play State Playing");
    }

    public override void OnBehaviourPause(Playable playable, FrameData info){
        Debug.Log("Play State Paused");
    }
}

OnBehaviourPlay和OnBehaviourPause分别为时间进度进入短条和离开短条所触发的方法。

OnGraphStart相当于一个初始化的方法，只有在Play之后才会调用

PrepareFrame和ProcessFrame调用与帧有关，两个方法调用的次数是一样的，只有时间进度进入短条后，这两个方法才会每帧调用。

要在Playable中控制外围对象不适用public这种，而是用public ExposedReference相当于public GameObject;

public ExposedReference相当于public Transform;

还有一种切换继承对象的用法：public ExposedReference Component;相当于这个component是在MonoBehaviour下运行的；

public ExposedReference相当于EventTrigger；

所有这些方法都是先public ExposedReference然后在private一个<>里的结构，最后在OnGraphStart()中把private对象使用Resolve(playable.GetGraph().GetResolver());方法实例化使用。Resolve(playable.GetGraph().GetResolver())相当于把对象扔到Timeline里处理的意思。

using UnityEngine;
using UnityEngine.Playables;
using UnityEngine.Timeline;

public class ToggleComponentPlayable : BasicPlayableBehaviour
{
	public ExposedReference Component;

	private MonoBehaviour _component;

	public bool EnabledOnStart;
	public bool EnabledOnEnd;

	private GameObject m_GameObject;

	public override void OnGraphStart(Playable playable) 
	{
		_component = Component.Resolve(playable.GetGraph().GetResolver());
	}	
	
	public override void OnBehaviourPlay(Playable playable, FrameData info)
    {
        if (_component != null) 
		{
			_component.enabled = EnabledOnStart;
		}
    }
	
    public override void OnBehaviourPause(Playable playable, FrameData info)
	{
		if (_component != null) 
		{
			_component.enabled = EnabledOnEnd;
		}	
	}
}

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