Declaring events?

Is it possible to create custom events that uses Unity 4.6 system for selecting listeners and methods in the inspector?

 

yes use public UnityEvent field in script and call Invoke() (in script or this will not work) whenever u want.

 

Awesome.

Is there a way to declare the event in such a way that passing arguments works?

 

this is possible but for more infos use off/online scripting reference this is good enough

 

Having trouble finding things in the in the 4.6 documentation. Many things don't even seem to be linked, even though they're there (only find through google).

Can you link where in the documentation it shows how to create custom events with parameters allowed?

 

http://docs.unity3d.com/460/Documentation/ScriptReference/Events.UnityEvent_1.html

one parameter but more is possible too (ensure u have JS mode because there no c# example) but multiple parameters is allowed only via scripting this doesnt work with inspector (unity recognise only one or zero parameter function in inspector)

 

To have parameters you need to inherit from UnityEvent<T> like so

Code (Custom UnityEvent):

1. public MyEventType onMyEvent;
2.  
3. [System.Serializable]
4. public class MyEventType : UnityEvent<float> {}

I learned this from looking through the source code of the Trigger component.
https://gist.github.com/stramit/d473dec2a6fe7dd6fb61

Code (Toggle):

1. [Serializable]
2. public class ToggleEvent : UnityEvent<bool>
3. {}

You can add up to 4 parameters.

• UnityEvent<T0>
• UnityEvent<T0,T1>
• UnityEvent<T0,T1,T2>
• UnityEvent<T0,T1,T2,T3>

 

Yes, I looked through the JS example in the documentation that Breyer linked, and understood the implication.

I think it's unfortunate that you have to extend a class. It would have been easier to just declare for example UnityEvent<float>, and let Unity handle the creation of any additional classes required behind the scenes. If custom behavior is required then obviously you'd have to extend the class, but I bet that 95% of the time all you'd want to do is simply have the standard unity event but with a specific type parameter.

 

Yea it's a bit odd. I'm sure it has to do with some internal limitations or something. They allow you to define List<T> without having to inherit from a class so why not UnityEvent<T> too?

 

how would i display this when i got a editor script and custom inspector? got it all working perfect with the typeless UnityEvent, i just dont know how to make it display in a custom inspector as it does without one.

 

Good question. As soon as I use UnityEvent<MyEvent> the field hides from the inspector:

Code (csharp):

1. [Serializable]
2. public class MyEvent : UnityEvent<float> {}

Anyone got this working?

 

That's just declaring the class. You need to declare a reference to your custom event too.

Code (CSharp):

1. [Serializable]
2. public class MyEvent : UnityEvent<float> {}
3.  
4. public MyEvent onMyEvent;

 

Yes, had those reference, but got another error. Thanks, it's working now!