Issue with CustomEvents

🌵 Needle Engine
1

Hi I’m following the documentation of Declare a custom event type : Script Examples | Needle Engine Documentation

1 - I have added this C# script to the Needle/Components.codegen file :

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

[System.Serializable]
public class MyCustomUnityEvent : MonoBehaviour
{
}

2- Then I copy-pasted both classes from the documentation


    // The next line is not just a comment, it defines 
    // a specific type for the component generator to use.

    //@type MyCustomUnityEvent
    @serializable(EventList)
    myEvent!: EventList;

    // just for testing - could be when a button is clicked, etc.
    start() {
        this.myEvent.invoke("Hello");
    }
}

export class CustomEventReceiver extends Behaviour {

    logStringAndObject(str: string) {
        console.log("From Event: ", str);
    }
}```

3- But when I add both scripts to an GameObject , the field of `myEvent` from `CustomEventCaller ` looks like this and I cannot add the the reference of `CustomEventReceiver ` :
![image.png](https://cdn.discordapp.com/attachments/1167634515972337684/1167634516140105829/image.png?ex=65d944e2&is=65c6cfe2&hm=84399892e60aa2fa2cd87078d08b459dfa7d57a7b6f04b2e3ccc09a324813b3c&)

[Original Post on Discord](https://discord.com/channels/717429793926283276/1167634515972337684)

*by user 632418299711324161*
2

If I delete this line from CustomEventCaller : //@type MyCustomUnityEvent, then it looks like this :
image.png

by user 632418299711324161

3

But when I Invoke the method, nothing happens

by user 632418299711324161

4

Do you know what could be happening ?

by user 632418299711324161

5

If you do not have any methods/listeners added to your event list / unity event then nothing will happen if you call invoke

Click the plus button in the MyEvent list in unity and add a method to be called when you invoke your Event. What you have been building here is a flexible way to connect events in the unity editor :slightly_smiling_face: you just need to make the connections now and it will work

6

That´s the problem, if I add a method to the MyEventList nothing happens in this case. I follow each step in the documentation but it doesn´t work. Could you give a brief explanation of each step to call a custom event ? Maybe there is something I am losing.

by user 632418299711324161

7

Can you show an example where you have added a method to the event?

8

Srry for no answer but I made another example and it works almost fine. This is my example :
I have a Sphere with two scripts :
The first one :


    // The next line is not just a comment, it defines 
    // a specific type for the component generator to use.

    
    @serializable(EventList)
    myEvent!: EventList;


    update(): void {
        if(this.context.input.getKeyDown()=='a'){
            this.myEvent.invoke("Hello");
        }
    }
}```
The second one :

export class CustomEventReceiver extends Behaviour {
logStringAndObject(str: string) {
console.log("From Event: "+str);
}
}


*by user 632418299711324161*
9

This is how the sphere looks in Unity :

image.png
image.png594×797 56 KB

by user 632418299711324161

10

This is the console’s log :

image.png
image.png949×609 50.9 KB

by user 632418299711324161

11

So it seems that the event actually is beeing invoking but not with the argument of “Hello” which I’m passing in CustomEventCaller.

by user 632418299711324161

12

Otherwise if I write directly in Unity the argument for the method logStringAndObject, like this :
image.png

by user 632418299711324161

13

image.png
image.png959×602 54.8 KB

by user 632418299711324161

14

This is my log.

by user 632418299711324161

15

But I want the argument to be passed from the script CustomEventCaller, Do you know what could be wrong ? Thanks :slightly_smiling_face:

by user 632418299711324161

16

When you save this script again the component generator will create UnityEvent without the argument - which seems to be what you actually want. If you have a string argument serialized in Unity that’s what will be used to invoke the event

17

Okey, thanks again marcel : )

by user 632418299711324161