Is it possible to add persistent listeners with multiple arguments to a unity event?-CodePudding

I've been looking online for an answer for a while now, and can't find anything conclusive, which leads me to think you can't, but I thought it better to ask just to clarify.

I'm using a custom inspector window to handle text display, and I've got it to handle single argument functions with AddIntPersistentListener, AddStringPersistentListener, ect, but I want to be able to do more complicated things that require 2 or 3 parameters. Originally, I tried using a lambda for this, but it throws an error when I try to update the event.

I understand you can use a UnityEvent<T0,T1,T2> to have multiple arguments, but to my knowledge, those aren't persistent. I have a function that generates the event, so I could generate the event and then invoke it, meaning that it wouldn't have to be persistent, but I feel that would be clunky.

Does anyone have any suggestions?

CodePudding user response：

Adding persistent listeners is done with UnityEventTools.

But since you have used it for an UnityEvent with one parameter I think you know this.

Using lambda functions with not work for this as unity needs a reference so serialize in the listener.

using UnityEditor.Events; // works only in editor
using UnityEngine;
using UnityEngine.Events;


public class PersistentListenerExample: MonoBehaviour
{
    public UnityEvent<int, string, float> OnMyEvent;

    private void Start()
    {
        int a = 1;
        string b = "2";
        float c = 3.0f;
        UnityEventTools.AddPersistentListener(OnMyEvent, OnMyEventFired);

    }

    public void OnMyEventFired(int a, string b, float c)
    {
        Debug.Log("OnMyEventFired with params: "   a   ", "   b   ", "   c);
    }
}