Gun spread overlay (#8588)

Content.Client/Weapons/Ranged/Systems/GunSystem.cs

@@ -13,6 +13,7 @@ using Robust.Shared.Audio;
 using Robust.Shared.Input;
 using Robust.Shared.Map;
 using Robust.Shared.Player;
+using Robust.Shared.Timing;
 using Robust.Shared.Utility;
 using SharedGunSystem = Content.Shared.Weapons.Ranged.Systems.SharedGunSystem;
 
@@ -27,6 +28,34 @@ public sealed partial class GunSystem : SharedGunSystem
     [Dependency] private readonly EffectSystem _effects = default!;
     [Dependency] private readonly InputSystem _inputSystem = default!;
 
+    public bool SpreadOverlay
+    {
+        get => _spreadOverlay;
+        set
+        {
+            if (_spreadOverlay == value) return;
+            _spreadOverlay = value;
+            var overlayManager = IoCManager.Resolve<IOverlayManager>();
+
+            if (_spreadOverlay)
+            {
+                overlayManager.AddOverlay(new GunSpreadOverlay(
+                    EntityManager,
+                    IoCManager.Resolve<IEyeManager>(),
+                    IoCManager.Resolve<IGameTiming>(),
+                    IoCManager.Resolve<IInputManager>(),
+                    IoCManager.Resolve<IPlayerManager>(),
+                    this));
+            }
+            else
+            {
+                overlayManager.RemoveOverlay<GunSpreadOverlay>();
+            }
+        }
+    }
+
+    private bool _spreadOverlay;
+
     public override void Initialize()
     {
         base.Initialize();