Custom onClick list - unity3d

Question

Can i create custom region with grouped methods for list onClick like dynamic and statics?
like this

Answer 1

Yes and no! ^^
Yes, you can create your own event type taking a parameter and assign dynamic callbacks to it. What you are looking for is UnityEvent.
For the dynamic parameterized ones see UnityEvent<T0> to UnityEvent<T0, T1, T2, T3> depending on how many parameters you need.
For the example with a single int it would be (exactly as in the API example)
// Since Unity doesn't support direct serialization of generics you have to implement this [Serializable] wrapper
[Serializable]
public class MyIntEvent : UnityEvent<int>
{
}
public class ExampleClass : MonoBehaviour
{
public MyIntEvent m_MyEvent;
}
No, you can not simply change the existing implementation of UI.Button.onClick which is parameterless.
What you could do, however, is build a new component and attach it on a button like
[RequireComponent(typeof(Button))]
public class ExampleClass : MonoBehaviour
{
[SerializeField] private Button _button;
public MyIntEvent onClickWithIntParameter;
private void Awake()
{
if(!_button) _button = GetComponent<Button>();
_button.onClick.AddListener(HandleOnClick);
}
private void HandleOnClick()
{
// Wherever you get your int from
var value = 123;
onClickWithIntParameter.Invoke(value);
}
}

Answer 2

In the case that [Serializable] isn't working for you try [System.Serializable] or using System; at the top.

Answer 3

For Those who want to create a custom event Script:
I made a collision detection script. The events set in the inspector are called when a collision is detected. Just like a button.
https://i.stack.imgur.com/r4epP.png
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
using UnityEngine;
using UnityEngine.Events;
public class CollisionCallFunc : MonoBehaviour {
[System.Serializable]
public class CollisionEvent : UnityEvent<object> {
public object value;
}
[SerializeField]
private CollisionEvent collisionEvents = new();
private void OnCollisionEnter(Collision collision) {
try {
collisionEvents.Invoke(collisionEvents.value);
} catch(System.Exception exception) {
Debug.LogWarning("Couldn't invoke action. Error:");
Debug.LogWarning(exception.Message);
}
}
private void OnCollisionEnter2D(Collision2D collision) {
try {
collisionEvents.Invoke(collisionEvents.value);
} catch(System.Exception exception) {
Debug.LogWarning("Couldn't invoke action. Error:");
Debug.LogWarning(exception.Message);
}
}
}