Make GetExplosionResistance event a struct (#20274)

Also fixed a typo.

Content.Server/Explosion/EntitySystems/ExplosionSystem.Airtight.cs

@@ -152,7 +152,7 @@ public sealed partial class ExplosionSystem : EntitySystem
                     continue;
 
                 var ev = new GetExplosionResistanceEvent(explosionType.ID);
-                RaiseLocalEvent(uid, ev, false);
+                RaiseLocalEvent(uid, ref ev);
 
                 damagePerIntensity += value * Math.Max(0, ev.DamageCoefficient);
             }

Content.Server/Explosion/EntitySystems/ExplosionSystem.Processing.cs

@@ -390,7 +390,7 @@ public sealed partial class ExplosionSystem : EntitySystem
         if (damage != null && damageQuery.TryGetComponent(uid, out var damageable))
         {
             var ev = new GetExplosionResistanceEvent(id);
-            RaiseLocalEvent(uid, ev, false);
+            RaiseLocalEvent(uid, ref ev, false);
 
             ev.DamageCoefficient = Math.Max(0, ev.DamageCoefficient);
 

Content.Server/Explosion/EntitySystems/ExplosionSystem.cs

@@ -76,7 +76,7 @@ public sealed partial class ExplosionSystem : EntitySystem
         SubscribeLocalEvent<ExplosionResistanceComponent, GetExplosionResistanceEvent>(OnGetResistance);
 
         // as long as explosion-resistance mice are never added, this should be fine (otherwise a mouse-hat will transfer it's power to the wearer).
-        SubscribeLocalEvent<ExplosionResistanceComponent, InventoryRelayedEvent<GetExplosionResistanceEvent>>((e, c, ev) => OnGetResistance(e, c, ev.Args));
+        SubscribeLocalEvent<ExplosionResistanceComponent, InventoryRelayedEvent<GetExplosionResistanceEvent>>(RelayedResistance);
 
         SubscribeLocalEvent<TileChangedEvent>(OnTileChanged);
 
@@ -112,10 +112,17 @@ public sealed partial class ExplosionSystem : EntitySystem
         _pathfindingSystem.PauseUpdating = false;
     }
 
-    private void OnGetResistance(EntityUid uid, ExplosionResistanceComponent component, GetExplosionResistanceEvent args)
+    private void RelayedResistance(EntityUid uid, ExplosionResistanceComponent component,
+        InventoryRelayedEvent<GetExplosionResistanceEvent> args)
+    {
+        var a = args.Args;
+        OnGetResistance(uid, component, ref a);
+    }
+
+    private void OnGetResistance(EntityUid uid, ExplosionResistanceComponent component, ref GetExplosionResistanceEvent args)
     {
         args.DamageCoefficient *= component.DamageCoefficient;
-        if (component.Modifiers.TryGetValue(args.ExplotionPrototype, out var modifier))
+        if (component.Modifiers.TryGetValue(args.ExplosionPrototype, out var modifier))
             args.DamageCoefficient *= modifier;
     }
 

Content.Shared/Explosion/ExplosionEvents.cs

@@ -8,19 +8,15 @@ namespace Content.Shared.Explosion;
 ///     Raised directed at an entity to determine its explosion resistance, probably right before it is about to be
 ///     damaged by one.
 /// </summary>
-public sealed class GetExplosionResistanceEvent : EntityEventArgs, IInventoryRelayEvent
+[ByRefEvent]
+public record struct GetExplosionResistanceEvent(string ExplosionPrototype) : IInventoryRelayEvent
 {
     /// <summary>
     ///     A coefficient applied to overall explosive damage.
     /// </summary>
     public float DamageCoefficient = 1;
 
-    public readonly string ExplotionPrototype;
+    public readonly string ExplosionPrototype = ExplosionPrototype;
 
     SlotFlags IInventoryRelayEvent.TargetSlots =>  ~SlotFlags.POCKET;
-
-    public GetExplosionResistanceEvent(string id)
-    {
-        ExplotionPrototype = id;
-    }
 }

Content.Shared/Inventory/InventorySystem.Relay.cs

@@ -24,7 +24,7 @@ public partial class InventorySystem
         SubscribeLocalEvent<InventoryComponent, ElectrocutionAttemptEvent>(RelayInventoryEvent);
         SubscribeLocalEvent<InventoryComponent, SlipAttemptEvent>(RelayInventoryEvent);
         SubscribeLocalEvent<InventoryComponent, RefreshMovementSpeedModifiersEvent>(RelayInventoryEvent);
-        SubscribeLocalEvent<InventoryComponent, GetExplosionResistanceEvent>(RelayInventoryEvent);
+        SubscribeLocalEvent<InventoryComponent, GetExplosionResistanceEvent>(RefRelayInventoryEvent);
         SubscribeLocalEvent<InventoryComponent, BeforeStripEvent>(RelayInventoryEvent);
         SubscribeLocalEvent<InventoryComponent, SeeIdentityAttemptEvent>(RelayInventoryEvent);
         SubscribeLocalEvent<InventoryComponent, ModifyChangedTemperatureEvent>(RelayInventoryEvent);
@@ -42,7 +42,22 @@ public partial class InventorySystem
         SubscribeLocalEvent<InventoryComponent, GetVerbsEvent<EquipmentVerb>>(OnGetStrippingVerbs);
     }
 
-    protected void RelayInventoryEvent<T>(EntityUid uid, InventoryComponent component, T args) where T : EntityEventArgs, IInventoryRelayEvent
+    protected void RefRelayInventoryEvent<T>(EntityUid uid, InventoryComponent component, ref T args) where T : IInventoryRelayEvent
+    {
+        // Just so I don't have to update 20 morbillion events at once.
+        if (args.TargetSlots == SlotFlags.NONE)
+            return;
+
+        var containerEnumerator = new ContainerSlotEnumerator(uid, component.TemplateId, _prototypeManager, this, args.TargetSlots);
+        var ev = new InventoryRelayedEvent<T>(args);
+        while (containerEnumerator.MoveNext(out var container))
+        {
+            if (!container.ContainedEntity.HasValue) continue;
+            RaiseLocalEvent(container.ContainedEntity.Value, ev, broadcast: false);
+        }
+    }
+
+    protected void RelayInventoryEvent<T>(EntityUid uid, InventoryComponent component, T args) where T : IInventoryRelayEvent
     {
         if (args.TargetSlots == SlotFlags.NONE)
             return;
@@ -93,7 +108,7 @@ public partial class InventorySystem
 ///      happens to be a dead mouse. Clothing that wishes to modify movement speed must subscribe to
 ///      InventoryRelayedEvent&lt;RefreshMovementSpeedModifiersEvent&gt;
 /// </remarks>
-public sealed class InventoryRelayedEvent<TEvent> : EntityEventArgs where TEvent : EntityEventArgs
+public sealed class InventoryRelayedEvent<TEvent> : EntityEventArgs
 {
     public readonly TEvent Args;
 

Content.Shared/SubFloor/SharedSubFloorHideSystem.cs

@@ -35,7 +35,7 @@ namespace Content.Shared.SubFloor
             SubscribeLocalEvent<SubFloorHideComponent, GetExplosionResistanceEvent>(OnGetExplosionResistance);
         }
 
-        private void OnGetExplosionResistance(EntityUid uid, SubFloorHideComponent component, GetExplosionResistanceEvent args)
+        private void OnGetExplosionResistance(EntityUid uid, SubFloorHideComponent component, ref GetExplosionResistanceEvent args)
         {
             if (component.BlockInteractions && component.IsUnderCover)
                 args.DamageCoefficient = 0;