Delegates and Events , prime31 tutorial...

Unity Engine
1

Hi
In this video prime31 is showing how to use delegates :

I like it , and I use it all the time. Thank you Prime31.

I have question : In this video event listener is attached to couple different cubes. When I press a button all objects are doing exactly the same cool… is there a way to specify in event listener script with cube should move , after buttons is pressed ?
Imagine that you are touching one of this cubes and you want it to jump but only this that you touched .

Or the only solution is to have 3 different event listeners even if they are exactly the same ?
I was trying using tags in event handler but it doesn’t work.

Thank you in advance

2

Hi AngryOrange

The point of events is to have multiple listeners, so in your use case they might not be the way to go. You could send your event with a cubeID param, that each cube would then check against its ID to react or not, but that would be a very ineffective way of doing things. In this case, I’d advise a simple SendMessage to the touched cube.

3

I didn’t see this movie, but if you want to handle that through delegate you can do something like this
It’s a pserudo code

public delegate CubePress(GameObject obj);

class blabla {
    public static CubePress onCubePress;

    void Init(){
        onCubePress+=onCubePressListener();
    }

    void onCubePressListener(GameObject obj){
        if (obj==this){
            jump();
        }
    }

    void onTriggerEnter(){
        if (onCubePress!=null){
            onCubePress(this);
        }
    }
}
4

thank you grezo and nicloay this is exactly what I was thinking about… First don’t use delegates but simple SendMessage and second send a GameObject as a param… I will try this today.
I thought maybe is something like “only delegates trick” to do this but it sounds like I’am on a good track.
Thank you guys :slight_smile: