Unrevert #10934

Content.Shared/Clothing/ClothingSpeedModifierSystem.cs

@@ -1,4 +1,5 @@
-using Content.Shared.Examine;
+using Content.Shared.Examine;
+using Content.Shared.Inventory;
 using Content.Shared.Movement.Systems;
 using Content.Shared.Verbs;
 using Robust.Shared.Containers;
@@ -19,7 +20,7 @@ public sealed class ClothingSpeedModifierSystem : EntitySystem
 
         SubscribeLocalEvent<ClothingSpeedModifierComponent, ComponentGetState>(OnGetState);
         SubscribeLocalEvent<ClothingSpeedModifierComponent, ComponentHandleState>(OnHandleState);
-        SubscribeLocalEvent<ClothingSpeedModifierComponent, RefreshMovementSpeedModifiersEvent>(OnRefreshMoveSpeed);
+        SubscribeLocalEvent<ClothingSpeedModifierComponent, InventoryRelayedEvent<RefreshMovementSpeedModifiersEvent>>(OnRefreshMoveSpeed);
         SubscribeLocalEvent<ClothingSpeedModifierComponent, GetVerbsEvent<ExamineVerb>>(OnClothingVerbExamine);
     }
 
@@ -65,12 +66,12 @@ public sealed class ClothingSpeedModifierSystem : EntitySystem
         }
     }
 
-    private void OnRefreshMoveSpeed(EntityUid uid, ClothingSpeedModifierComponent component, RefreshMovementSpeedModifiersEvent args)
+    private void OnRefreshMoveSpeed(EntityUid uid, ClothingSpeedModifierComponent component, InventoryRelayedEvent<RefreshMovementSpeedModifiersEvent> args)
     {
         if (!component.Enabled)
             return;
 
-        args.ModifySpeed(component.WalkModifier, component.SprintModifier);
+        args.Args.ModifySpeed(component.WalkModifier, component.SprintModifier);
     }
 
     private void OnClothingVerbExamine(EntityUid uid, ClothingSpeedModifierComponent component, GetVerbsEvent<ExamineVerb> args)

Content.Shared/Clothing/SharedMagbootsSystem.cs

@@ -24,7 +24,7 @@ public abstract class SharedMagbootsSystem : EntitySystem
         base.Initialize();
 
         SubscribeLocalEvent<MagbootsComponent, GetVerbsEvent<ActivationVerb>>(AddToggleVerb);
-        SubscribeLocalEvent<MagbootsComponent, SlipAttemptEvent>(OnSlipAttempt);
+        SubscribeLocalEvent<MagbootsComponent, InventoryRelayedEvent<SlipAttemptEvent>>(OnSlipAttempt);
         SubscribeLocalEvent<MagbootsComponent, GetItemActionsEvent>(OnGetActions);
         SubscribeLocalEvent<MagbootsComponent, ToggleActionEvent>(OnToggleAction);
     }
@@ -72,10 +72,10 @@ public abstract class SharedMagbootsSystem : EntitySystem
         args.Verbs.Add(verb);
     }
 
-    private void OnSlipAttempt(EntityUid uid, MagbootsComponent component, SlipAttemptEvent args)
+    private void OnSlipAttempt(EntityUid uid, MagbootsComponent component, InventoryRelayedEvent<SlipAttemptEvent> args)
     {
         if (component.On)
-            args.Cancel();
+            args.Args.Cancel();
     }
 
     private void OnGetActions(EntityUid uid, MagbootsComponent component, GetItemActionsEvent args)

Content.Shared/Electrocution/SharedElectrocutionSystem.cs

@@ -1,3 +1,4 @@
+using Content.Shared.Inventory;
 using Robust.Shared.GameStates;
 
 namespace Content.Shared.Electrocution
@@ -9,6 +10,8 @@ namespace Content.Shared.Electrocution
             base.Initialize();
 
             SubscribeLocalEvent<InsulatedComponent, ElectrocutionAttemptEvent>(OnInsulatedElectrocutionAttempt);
+            // as long as legally distinct electric-mice are never added, this should be fine (otherwise a mouse-hat will transfer it's power to the wearer).
+            SubscribeLocalEvent<InsulatedComponent, InventoryRelayedEvent<ElectrocutionAttemptEvent>>((e, c, ev) => OnInsulatedElectrocutionAttempt(e, c, ev.Args));
             SubscribeLocalEvent<InsulatedComponent, ComponentGetState>(OnInsulatedGetState);
             SubscribeLocalEvent<InsulatedComponent, ComponentHandleState>(OnInsulatedHandleState);
         }

Content.Shared/IdentityManagement/SharedIdentitySystem.cs

@@ -1,4 +1,5 @@
-using Content.Shared.IdentityManagement.Components;
+using Content.Shared.IdentityManagement.Components;
+using Content.Shared.Inventory;
 using Robust.Shared.Containers;
 
 namespace Content.Shared.IdentityManagement;
@@ -14,6 +15,7 @@ public abstract class SharedIdentitySystem : EntitySystem
 
         SubscribeLocalEvent<IdentityComponent, ComponentInit>(OnComponentInit);
         SubscribeLocalEvent<IdentityBlockerComponent, SeeIdentityAttemptEvent>(OnSeeIdentity);
+        SubscribeLocalEvent<IdentityBlockerComponent, InventoryRelayedEvent<SeeIdentityAttemptEvent>>((e, c, ev) => OnSeeIdentity(e, c, ev.Args));
     }
 
     private void OnSeeIdentity(EntityUid uid, IdentityBlockerComponent component, SeeIdentityAttemptEvent args)

Content.Shared/Inventory/InventorySystem.Relay.cs

@@ -5,6 +5,7 @@ using Content.Shared.IdentityManagement.Components;
 using Content.Shared.Movement.Systems;
 using Content.Shared.Slippery;
 using Content.Shared.Strip.Components;
+using Content.Shared.Temperature;
 
 namespace Content.Shared.Inventory;
 
@@ -19,19 +20,43 @@ public partial class InventorySystem
         SubscribeLocalEvent<InventoryComponent, GetExplosionResistanceEvent>(RelayInventoryEvent);
         SubscribeLocalEvent<InventoryComponent, BeforeStripEvent>(RelayInventoryEvent);
         SubscribeLocalEvent<InventoryComponent, SeeIdentityAttemptEvent>(RelayInventoryEvent);
+        SubscribeLocalEvent<InventoryComponent, ModifyChangedTemperatureEvent>(RelayInventoryEvent);
     }
 
     protected void RelayInventoryEvent<T>(EntityUid uid, InventoryComponent component, T args) where T : EntityEventArgs, IInventoryRelayEvent
     {
+        if (args.TargetSlots == SlotFlags.NONE)
+            return;
+
         var containerEnumerator = new ContainerSlotEnumerator(uid, component.TemplateId, _prototypeManager, this, args.TargetSlots);
-        while(containerEnumerator.MoveNext(out var container))
+        var ev = new InventoryRelayedEvent<T>(args);
+        while (containerEnumerator.MoveNext(out var container))
         {
-            if(!container.ContainedEntity.HasValue) continue;
-            RaiseLocalEvent(container.ContainedEntity.Value, args, false);
+            if (!container.ContainedEntity.HasValue) continue;
+            RaiseLocalEvent(container.ContainedEntity.Value, ev, false);
         }
     }
 }
 
+/// <summary>
+///     Event wrapper for relayed events.
+/// </summary>
+/// <remarks>
+///      This avoids nested inventory relays, and makes it easy to have certain events only handled by the initial
+///      target entity. E.g. health based movement speed modifiers should not be handled by a hat, even if that hat
+///      happens to be a dead mouse. Clothing that wishes to modify movement speed must subscribe to
+///      InventoryRelayedEvent<RefreshMovementSpeedModifiersEvent>
+/// </remarks>
+public sealed class InventoryRelayedEvent<TEvent> : EntityEventArgs where TEvent : EntityEventArgs, IInventoryRelayEvent
+{
+    public readonly TEvent Args;
+
+    public InventoryRelayedEvent(TEvent args)
+    {
+        Args = args;
+    }
+}
+
 /// <summary>
 ///     Events that should be relayed to inventory slots should implement this interface.
 /// </summary>

Content.Shared/Slippery/SlipperySystem.cs

@@ -30,6 +30,8 @@ namespace Content.Shared.Slippery
             SubscribeLocalEvent<SlipperyComponent, StepTriggerAttemptEvent>(HandleAttemptCollide);
             SubscribeLocalEvent<SlipperyComponent, StepTriggeredEvent>(HandleStepTrigger);
             SubscribeLocalEvent<NoSlipComponent, SlipAttemptEvent>(OnNoSlipAttempt);
+            // as long as slip-resistant mice are never added, this should be fine (otherwise a mouse-hat will transfer it's power to the wearer).
+            SubscribeLocalEvent<NoSlipComponent, InventoryRelayedEvent<SlipAttemptEvent>>((e, c, ev) => OnNoSlipAttempt(e, c, ev.Args));
             SubscribeLocalEvent<SlipperyComponent, ComponentGetState>(OnSlipperyGetState);
             SubscribeLocalEvent<SlipperyComponent, ComponentHandleState>(OnSlipperyHandleState);
         }

Content.Shared/Strip/ThievingSystem.cs

@@ -11,6 +11,7 @@ public sealed class ThievingSystem : EntitySystem
         base.Initialize();
 
         SubscribeLocalEvent<ThievingComponent, BeforeStripEvent>(OnBeforeStrip);
+        SubscribeLocalEvent<ThievingComponent, InventoryRelayedEvent<BeforeStripEvent>>((e, c, ev) => OnBeforeStrip(e, c, ev.Args));
     }
 
     private void OnBeforeStrip(EntityUid uid, ThievingComponent component, BeforeStripEvent args)

Content.Shared/Temperature/TemperatureEvents.cs

@@ -0,0 +1,15 @@
+using Content.Shared.Inventory;
+
+namespace Content.Shared.Temperature;
+
+public sealed class ModifyChangedTemperatureEvent : EntityEventArgs, IInventoryRelayEvent
+{
+    public SlotFlags TargetSlots { get; } = ~SlotFlags.POCKET;
+
+    public float TemperatureDelta;
+
+    public ModifyChangedTemperatureEvent(float temperature)
+    {
+        TemperatureDelta = temperature;
+    }
+}