Add alt click to hands (#12330)

Content.Shared/Hands/EntitySystems/SharedHandsSystem.Interactions.cs

@@ -17,6 +17,7 @@ public abstract partial class SharedHandsSystem : EntitySystem
         SubscribeAllEvent<RequestHandInteractUsingEvent>(HandleInteractUsingInHand);
         SubscribeAllEvent<RequestUseInHandEvent>(HandleUseInHand);
         SubscribeAllEvent<RequestMoveHandItemEvent>(HandleMoveItemFromHand);
+        SubscribeAllEvent<RequestHandAltInteractEvent>(HandleHandAltInteract);
 
         SubscribeLocalEvent<SharedHandsComponent, ExaminedEvent>(HandleExamined);
 
@@ -65,6 +66,12 @@ public abstract partial class SharedHandsSystem : EntitySystem
             TryInteractHandWithActiveHand(args.SenderSession.AttachedEntity.Value, msg.HandName);
     }
 
+    private void HandleHandAltInteract(RequestHandAltInteractEvent msg, EntitySessionEventArgs args)
+    {
+        if (args.SenderSession.AttachedEntity != null)
+            TryUseItemInHand(args.SenderSession.AttachedEntity.Value, true);
+    }
+
     private void SwapHandsPressed(ICommonSession? session)
     {
         if (!TryComp(session?.AttachedEntity, out SharedHandsComponent? component))

Content.Shared/Hands/HandEvents.cs

@@ -267,6 +267,20 @@ namespace Content.Shared.Hands
         }
     }
 
+    /// <summary>
+    ///     Event raised by a client when they want to alt interact with the item currently in their hands.
+    /// </summary>
+    [Serializable, NetSerializable]
+    public sealed class RequestHandAltInteractEvent : EntityEventArgs
+    {
+        public EntityUid Entity { get; }
+
+        public RequestHandAltInteractEvent(EntityUid entity)
+        {
+            Entity = entity;
+        }
+    }
+
     public sealed class HandCountChangedEvent : EntityEventArgs
     {
         public HandCountChangedEvent(EntityUid sender)