Add conditional camera offset based on cursor - Hristov Rework, Part 1 (#31626)

Content.Server/Wieldable/WieldableSystem.cs

@@ -0,0 +1,45 @@
+using Content.Server.Movement.Components;
+using Content.Server.Movement.Systems;
+using Content.Shared.Camera;
+using Content.Shared.Hands;
+using Content.Shared.Movement.Components;
+using Content.Shared.Wieldable;
+using Content.Shared.Wieldable.Components;
+
+namespace Content.Server.Wieldable;
+
+public sealed class WieldableSystem : SharedWieldableSystem
+{
+    [Dependency] private readonly ContentEyeSystem _eye = default!;
+
+    public override void Initialize()
+    {
+        base.Initialize();
+
+        SubscribeLocalEvent<CursorOffsetRequiresWieldComponent, ItemUnwieldedEvent>(OnEyeOffsetUnwielded);
+        SubscribeLocalEvent<CursorOffsetRequiresWieldComponent, ItemWieldedEvent>(OnEyeOffsetWielded);
+        SubscribeLocalEvent<CursorOffsetRequiresWieldComponent, HeldRelayedEvent<GetEyePvsScaleRelayedEvent>>(OnGetEyePvsScale);
+    }
+
+    private void OnEyeOffsetUnwielded(Entity<CursorOffsetRequiresWieldComponent> entity, ref ItemUnwieldedEvent args)
+    {
+        _eye.UpdatePvsScale(args.User);
+    }
+
+    private void OnEyeOffsetWielded(Entity<CursorOffsetRequiresWieldComponent> entity, ref ItemWieldedEvent args)
+    {
+        _eye.UpdatePvsScale(args.User);
+    }
+
+    private void OnGetEyePvsScale(Entity<CursorOffsetRequiresWieldComponent> entity,
+        ref HeldRelayedEvent<GetEyePvsScaleRelayedEvent> args)
+    {
+        if (!TryComp(entity, out EyeCursorOffsetComponent? eyeCursorOffset) || !TryComp(entity.Owner, out WieldableComponent? wieldableComp))
+            return;
+
+        if (!wieldableComp.Wielded)
+            return;
+
+        args.Args.Scale += eyeCursorOffset.PvsIncrease;
+    }
+}