Listening to actions and passing parameters

September 25, 2023

I’m using Unity 2020.3.17f1, and I am working on a quest system. I want any script to be able to trigger an event, that the quest system will listen to and forward the quest progress based on that.

I am currently using System.Action trying to achieve this, but I need to pass parameters. For example, when I trigger the event OnEnemyKill, I want the listener to be able to know which enemy was killed.

Here is what I have set up so far:

QuestActions.cs

using System;

public class QuestActions
{
    public static Action<string> OnEnemyKilled;

}

SpacebarPresser.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class SpacebarPresser : MonoBehaviour
{
    void Update()
    {
        if (Input.GetKeyDown(KeyCode.Space))
        {
            QuestActions.OnEnemyKilled("hello");
        }
    }
}

QuestTracker.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class QuestTracker : MonoBehaviour
{
    private void OnEnable()
    {
        QuestActions.OnEnemyKilled += EnemyKilled;
    }
    
    private void OnDisable()
    {
        QuestActions.OnEnemyKilled -= EnemyKilled;
    }

    private void EnemyKilled(string msg)
    {
        Debug.Log("Message");
    }


}

The problem with my code, is that in QuestTracker.cs, I can’t figure out how to get the parameter that was used when invoking the action in SpacebarPresser.cs.

I have tried using other event-set-ups, but ran into the same problem when using delegates and events, and scriptable object events.