UnityTimeline

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Activation Track（对象激活与隐藏轨道）

Animation Track（动画轨道）

Audio Track（声音轨道）

Signal Track（信号轨道）

Signal包含三部分：Signal Asset（信号资源），Signal Emitter（信号发射器）和SignalReceiver（信号接收器），它其实就是一个Event，作用就是在单独轨道上面添加事件点，在某一帧执行某个方法
——创建信号发射器和信号资源
在轨道上右键选择Add Signal Emitter，Inspector面板选择从Project面板创建的Signal Asset或Create一个新的Signal Asset
——创建信号接收器

public class CustomSignalReceiver : MonoBehaviour, INotificationReceiver
{
    public void OnNotify(Playable origin, INotification notification, object context)
    {
        var signal = notification as CustomSignal;
        if (signal != null
            && signal.asset != null)
        {
            Debug.Log(signal.param);
        }
    }
}
 
public class CustomSignal : SignalEmitter
{
    public int param;
}

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自定义Timeline

Timeline分为以下四部分

——Track：轨道，继承自PlayableTrack:TrackAsset

[TrackColor(255f/255f,255f/255f,100f/255f)]
[TrackClipType(typeof(PlayableAsset))]
[TrackClipType(typeof(UnityEngine.Timeline.TimelineClip))]
[TrackBindingType(typeof(Transform))]
public class TransformTrack : TrackAsset
{
    public override Playable CreateTrackMixer(PlayableGraph graph, GameObject go, int inputCount)
    {
        return ScriptPlayable<TransformMixerBehaviour>.Create(graph, inputCount);
    }
}

——Clip：片段，一段Clip代表一个Playable，继承自PlayableAsset和ITimelineClipAsset

public class TransformClip : PlayableAsset,ITimelineClipAsset
{
    private TransformBehaviour template = new TransformBehaviour();
    // ExposedReference暴露引用才可以赋值
    public ExposedReference<Transform>  endLocation;
    public float moveSpeed;
    public override Playable CreatePlayable(PlayableGraph graph, GameObject owner)
    {
        template.endLocation = endLocation.Resolve(graph.GetResolver());
        template.moveSpeed = moveSpeed;

        Playable playable = ScriptPlayable<TransformBehaviour>.Create(graph,template);

        return playable;
    }

    public ClipCaps clipCaps =>  ClipCaps.None;
}

——Behavior、属于行为逻辑模板，继承自PlayableBehaviour

public class TransformBehaviour : PlayableBehaviour
{
    public Transform endLocation;
    public float moveSpeed;
    public override void ProcessFrame(Playable playable, FrameData info, object playerData)
    {
        Transform actor = playerData as Transform;
        actor.position = Vector3.Lerp(actor.position, endLocation.position, info.deltaTime * moveSpeed);
    }
}

——Mixer：属于混合行为，继承自PlayableBehaviour，贯穿整个轨道（主要通过GetInputWeight权重进行混合，TrackAsset类复写CreateTrackMixer()后创建混合器Behavior）

public class TransformMixerBehaviour : PlayableBehaviour
{
    public override void ProcessFrame(Playable playable, FrameData info, object playerData)
    {
        Transform transform = playerData as Transform;

        int inputCount = playable.GetInputCount();
        for (int i = 0; i < inputCount; i++)
        {
            var weight = playable.GetInputWeight(i);
        }
    }
}

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自定义行为逻辑，基类有一套自己的生命周期
OnPlayableCreate：每个Clip创建时（ Playable播放状态为playing时），相当于Awake
OnGraphStart：每个Clip创建时（ Playable播放状态为playing时），在OnPlayableCreate后执行，相当于Start
OnBehaviourPlay：Clip执行时
OnBehaviourPause：Clip暂停时
PrepareFrame：每帧执行，相当于Update，playerData就是轨道绑定的物体，默认是PlayableDirector组件挂载的物体
OnGraphStop：Playable停止时
OnPlayableDestroy：Playable销毁时

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——TrackColor特性：控制轨道颜色

——TrackClipType特性：可以添加的Clip类型

——TrackBindingType特性：绑定的数据对象，在ProcessFrame函数中会以playerData的形式传递进去

——OnCreateClip：面板上创建Clip时

——CreateTrackMixer：创建自定义混合轨道

——GetClips：获取轨道内的所有ClipAsset

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插件：Default Playables（Timeline Playable Wizard）可以快速创建几个文件

https://assetstore.unity.com/packages/tools/default-playables-95266

Timeline图像化插件Graph-visualizer