为从Unity中的抽象类继承的抽象类/脚本创建对象字段

Question

I'm trying to make a cutscene system in Unity (I hate using the timeline and it doesn't work for my purpose without a tonne of custom playables which I also hate making) so I decided to start making my own that uses a node based system.

My idea was that each node holds a class that inherits from an abstract class. This will be the actual code that runs for that node but my issue comes with the inheritance part:

It seems it's impossible to create an objectfield that only accepts scripts that inherit an abstract class. If I create an objectfield that only accepts CutsceneEvent (the name of the abstract class) I can't add any script to it whether it's the abstract class itself or any script that inherits from it.

My only solution was to set the field as Monoscript and then check the baseclass and remove/keep the script depending on if it inherits from CutsceneEvent but that comes with it's own issues (trying to then get specific functions and variables from that script which is only a Monoscript type and can't be converted to CutsceneEvent).

I'm completely stumped. Everywhere I've asked I've gotten basically ignored seemingly because no one knew how to solve it.

Here's some code.

The abstact class:

//CutsceneEvent 
public abstract class CutsceneEvent : MonoBehaviour
{
    public System.Action after;
    public abstract IEnumerator Function();
}

How I'm defining the variables(I'm using the xNode framework):

public CutsceneEvent function;
[Output] public CutsceneEventNode nextEvent;
[Input] public CutsceneEventNode lastEvent;
protected override void Init()
{

}




// Return the correct value of an output port when requested
public override object GetValue(NodePort port)
{

    return null;
}

Answer 1

U can use an Interface instead of an abstract class for your fields:

public interface ICutsceneEvent {}

//CutsceneEvent 
public abstract class CutsceneEvent : MonoBehaviour, ICutsceneEvent
{
    public System.Action after;
    public abstract IEnumerator Function();
}

Then instead of having a list of CutsceneEvent's, you can have a list of ICutsceneEvent's. You should put the abstract methods in the interface and implement them in the abstract class :D.

Also, check out Cinemachine if you haven't ^^