Gunify pneumatic cannon (#13296)

Content.Shared/Storage/Components/ItemMapperComponent.cs

@@ -60,6 +60,12 @@ namespace Content.Shared.Storage.Components
 
         [DataField("sprite")] public ResourcePath? RSIPath;
 
+        /// <summary>
+        ///     If this exists, shown layers will only consider entities in the given containers.
+        /// </summary>
+        [DataField("containerWhitelist")]
+        public HashSet<string>? ContainerWhitelist;
+
         public readonly List<string> SpriteLayers = new();
     }
 }

Content.Shared/Storage/EntitySystems/SharedItemMapperSystem.cs

@@ -42,12 +42,18 @@ namespace Content.Shared.Storage.EntitySystems
         private void MapperEntityRemoved(EntityUid uid, ItemMapperComponent itemMapper,
             EntRemovedFromContainerMessage args)
         {
+            if (itemMapper.ContainerWhitelist != null && !itemMapper.ContainerWhitelist.Contains(args.Container.ID))
+                return;
+
             UpdateAppearance(uid, itemMapper, args);
         }
 
         private void MapperEntityInserted(EntityUid uid, ItemMapperComponent itemMapper,
             EntInsertedIntoContainerMessage args)
         {
+            if (itemMapper.ContainerWhitelist != null && !itemMapper.ContainerWhitelist.Contains(args.Container.ID))
+                return;
+
             UpdateAppearance(uid, itemMapper, args);
         }
 
@@ -76,7 +82,7 @@ namespace Content.Shared.Storage.EntitySystems
             out IReadOnlyList<string> showLayers)
         {
             var containedLayers = _container.GetAllContainers(msg.Container.Owner)
-                .SelectMany(cont => cont.ContainedEntities).ToArray();
+                .Where(c => itemMapper.ContainerWhitelist?.Contains(c.ID) ?? true).SelectMany(cont => cont.ContainedEntities).ToArray();
 
             var list = new List<string>();
             foreach (var mapLayerData in itemMapper.MapLayers.Values)