Resolves SmokeVisualizer is Obsolete (#13881)

Content.Client/Chemistry/Visualizers/SmokeVisualizer.cs

@@ -1,28 +0,0 @@
-using Content.Shared.Smoking;
-using JetBrains.Annotations;
-using Robust.Client.GameObjects;
-using Robust.Shared.GameObjects;
-using Robust.Shared.IoC;
-using Robust.Shared.Maths;
-
-namespace Content.Client.Chemistry.Visualizers
-{
-    [UsedImplicitly]
-    public sealed class SmokeVisualizer : AppearanceVisualizer
-    {
-        [Obsolete("Subscribe to AppearanceChangeEvent instead.")]
-        public override void OnChangeData(AppearanceComponent component)
-        {
-            base.OnChangeData(component);
-
-            var entities = IoCManager.Resolve<IEntityManager>();
-            if (component.TryGetData<Color>(SmokeVisuals.Color, out var color))
-            {
-                if (entities.TryGetComponent(component.Owner, out SpriteComponent? sprite))
-                {
-                    sprite.Color = color;
-                }
-            }
-        }
-    }
-}

Content.Client/Chemistry/Visualizers/SmokeVisualizerSystem.cs

@@ -0,0 +1,22 @@
+using Content.Shared.Smoking;
+using Robust.Client.GameObjects;
+
+namespace Content.Client.Chemistry.Visualizers;
+
+/// <summary>
+/// Ensures entities with <see cref="SmokeVisualsComponent"/> have a color corresponding with their contained reagents.
+/// </summary>
+public sealed class SmokeVisualizerSystem : VisualizerSystem<SmokeVisualsComponent>
+{
+    /// <summary>
+    /// Syncs the color of the smoke with the color of its contained reagents.
+    /// </summary>
+    protected override void OnAppearanceChange(EntityUid uid, SmokeVisualsComponent comp, ref AppearanceChangeEvent args)
+    {
+        if (args.Sprite == null)
+            return;
+        if(!AppearanceSystem.TryGetData<Color>(uid, SmokeVisuals.Color, out var color))
+            return;
+        args.Sprite.Color = color;
+    }
+}

Content.Client/Chemistry/Visualizers/SmokeVisualsComponent.cs

@@ -0,0 +1,10 @@
+namespace Content.Client.Chemistry.Visualizers;
+
+/// <summary>
+/// A component that changes color to match its contained reagents.
+/// Managed by <see cref="SmokeVisualizerSystem"/>.
+/// Only functions with smoke at the moment.
+/// </summary>
+[RegisterComponent]
+[Access(typeof(SmokeVisualizerSystem))]
+public sealed class SmokeVisualsComponent : Component {}

Resources/Prototypes/Entities/Effects/chemistry_effects.yml

@@ -8,8 +8,7 @@
     sprite: Effects/chemsmoke.rsi
     state: chemsmoke
   - type: Appearance
-    visuals:
-      - type: SmokeVisualizer
+  - type: SmokeVisuals
   - type: Occluder
   - type: Transform
     anchored: true