rj-action-library-godot-development-project/Scripts/GameJam/Physics/OnCollision.cs

using Godot;
using Rokojori;

namespace GameJam
{  
  [GlobalClass]
  public partial class OnCollision:Node
  {
    [Export]
    public Area3D area;

    [Export]
    public RJAction onEntered;

    [Export]
    public RJAction onExit;

    public override void _Ready()
    {
      if ( area == null )
      { 
        return;
      }

      area.AreaEntered += ev => {  TriggerOnEnter(); };
      area.BodyEntered += ev => {  TriggerOnEnter(); };

      area.AreaExited += ev => { TriggerOnExited(); };
      area.BodyExited += ev => { TriggerOnExited(); };
    }     

    void TriggerOnEnter()
    {
      Actions.Trigger( onEntered );
    }

    void TriggerOnExited()
    {
      Actions.Trigger( onExit );
    }
  }
}