Anchorable component now raises cancellable event on (un)anchor. (#3828)

Content.Server/GameObjects/Components/AnchorableComponent.cs

@@ -83,6 +83,13 @@ namespace Content.Server.GameObjects.Components
             if (_physicsComponent == null)
                 return false;
 
+            var attempt = new AnchorAttemptMessage();
+
+            Owner.EntityManager.EventBus.RaiseLocalEvent(Owner.Uid, attempt, false);
+
+            if (attempt.Cancelled)
+                return false;
+
             _physicsComponent.BodyType = BodyType.Static;
 
             // Snap rotation to cardinal (multiple of 90)
@@ -100,6 +107,8 @@ namespace Content.Server.GameObjects.Components
             if (Snap)
                 Owner.SnapToGrid(SnapGridOffset.Center, Owner.EntityManager);
 
+            Owner.EntityManager.EventBus.RaiseLocalEvent(Owner.Uid, new AnchoredMessage(), false);
+
             return true;
         }
 
@@ -120,8 +129,17 @@ namespace Content.Server.GameObjects.Components
             if (_physicsComponent == null)
                 return false;
 
+            var attempt = new UnanchorAttemptMessage();
+
+            Owner.EntityManager.EventBus.RaiseLocalEvent(Owner.Uid, attempt, false);
+
+            if (attempt.Cancelled)
+                return false;
+
             _physicsComponent.BodyType = BodyType.Dynamic;
 
+            Owner.EntityManager.EventBus.RaiseLocalEvent(Owner.Uid, new UnanchoredMessage(), false);
+
             return true;
         }
 
@@ -147,4 +165,10 @@ namespace Content.Server.GameObjects.Components
             return await TryToggleAnchor(eventArgs.User, eventArgs.Using);
         }
     }
+
+    public class AnchorAttemptMessage : CancellableEntityEventArgs { }
+    public class UnanchorAttemptMessage : CancellableEntityEventArgs { }
+
+    public class AnchoredMessage : EntityEventArgs {}
+    public class UnanchoredMessage : EntityEventArgs {}
 }