tbd-station-14/Content.Shared/Interfaces/GameObjects/Components/Interaction/IInteractHand.cs

using System;
using JetBrains.Annotations;
using Robust.Shared.GameObjects;
using Robust.Shared.Interfaces.GameObjects;

namespace Content.Shared.Interfaces.GameObjects.Components
{
    /// <summary>
    /// This interface gives components behavior when being clicked on by a user with an empty hand
    /// who is in range and has unobstructed reach of the target entity (allows inside blockers).
    /// </summary>
    public interface IInteractHand
    {
        /// <summary>
        /// Called when a player directly interacts with an empty hand when user is in range of the target entity.
        /// </summary>
        bool InteractHand(InteractHandEventArgs eventArgs);
    }

    public class InteractHandEventArgs : EventArgs, ITargetedInteractEventArgs
    {
        public IEntity User { get; set; }
        public IEntity Target { get; set; }
    }


    /// <summary>
    ///      Raised when being clicked on or "attacked" by a user with an empty hand.
    /// </summary>
    [PublicAPI]
    public class AttackHandMessage : EntitySystemMessage
    {
        /// <summary>
        ///     If this message has already been "handled" by a previous system.
        /// </summary>
        public bool Handled { get; set; }

        /// <summary>
        ///     Entity that triggered the attack.
        /// </summary>
        public IEntity User { get; }

        /// <summary>
        ///     Entity that was attacked.
        /// </summary>
        public IEntity Attacked { get; }

        public AttackHandMessage(IEntity user, IEntity attacked)
        {
            User = user;
            Attacked = attacked;
        }
    }
}