Create event based architecture

Unity Engine
1

Hi there,
I’m coming from this article

https://unity3d.com/how-to/architect-with-scriptable-objects

and would like to know how to raise an event using this architecture. I created a GameEvent class

[CreateAssetMenu(fileName = "New Game Event", menuName = "Game Event")]
public class GameEvent : ScriptableObject
{
    private readonly List<GameEventSubscriber> subscriber = new List<GameEventSubscriber>();

    public void Raise()
    {
        for (int i = subscriber.Count - 1; i >= 0; i--)
        {
            subscriber[i].OnEventRaised();
        }
    }

    public void AddSubscriber(GameEventSubscriber subscriber)
    {
        this.subscriber.Add(subscriber);
    }

    public void RemoveSubscriber(GameEventSubscriber subscriber)
    {
        this.subscriber.Remove(subscriber);
    }
}

and a OnEnterButtonDown scriptable object for testing purposes. Further I created a GameEventSubscriber

public class GameEventSubscriber : MonoBehaviour
{
    [SerializeField]
    private GameEvent eventSubscribingTo;

    [SerializeField]
    private UnityEvent actionsToExecuteOnEventRaised;

    private void OnEnable()
    {
        eventSubscribingTo.AddSubscriber(this);
    }

    private void OnDisable()
    {
        eventSubscribingTo.RemoveSubscriber(this);
    }

    public void OnEventRaised()
    {
        actionsToExecuteOnEventRaised.Invoke();
    }
}

and a Notifier script

public class Notifier : MonoBehaviour
{
    public void Notify()
    {
        Debug.Log("Pressed!");
    }
}

What I didn’t get so far is how to raise an event now? Yes, the GameEvent has a method called Raise() that I can call but what is the correct way to manage those calls?

Let’s assume I have a class taking those “EnterButtonInputs” and it should raise the OnEnterButtonDown event, how should I do that?

2

Okay nevermind. My event-dispatching scripts needs to hold a reference to the GameEvent and then is able to call the Raise() method.

3

If yu want to go this road, I’d highly advise going for Reactive Architecture, e.g. using something like UniRx.

Rx is like events on steroids.