Resolves FoamVisualizer is Obsolete (#13880)

Content.Client/Chemistry/Visualizers/FoamVisualizerSystem.cs

@@ -0,0 +1,63 @@
+using Content.Shared.Foam;
+using Robust.Client.Animations;
+using Robust.Client.GameObjects;
+
+namespace Content.Client.Chemistry.Visualizers;
+
+/// <summary>
+/// The system responsible for ensuring <see cref="FoamVisualsComponent"/> plays the animation it's meant to when the foam dissolves.
+/// </summary>
+public sealed class FoamVisualizerSystem : VisualizerSystem<FoamVisualsComponent>
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<FoamVisualsComponent, ComponentInit>(OnComponentInit);
+    }
+
+    /// <summary>
+    /// Generates the animation used by foam visuals when the foam dissolves.
+    /// </summary>
+    private void OnComponentInit(EntityUid uid, FoamVisualsComponent comp, ComponentInit args)
+    {
+        comp.Animation = new Animation()
+        {
+            Length = TimeSpan.FromSeconds(comp.AnimationTime),
+            AnimationTracks =
+            {
+                new AnimationTrackSpriteFlick()
+                {
+                    LayerKey = FoamVisualLayers.Base,
+                    KeyFrames =
+                    {
+                        new AnimationTrackSpriteFlick.KeyFrame(comp.State, 0f)
+                    }
+                }
+            }
+        };
+    }
+
+    /// <summary>
+    /// Plays the animation used by foam visuals when the foam dissolves.
+    /// </summary>
+    protected override void OnAppearanceChange(EntityUid uid, FoamVisualsComponent comp, ref AppearanceChangeEvent args)
+    {
+        if (AppearanceSystem.TryGetData<bool>(uid, FoamVisuals.State, out var state, args.Component) && state)
+        {
+            if (TryComp(uid, out AnimationPlayerComponent? animPlayer)
+            && !AnimationSystem.HasRunningAnimation(uid, animPlayer, FoamVisualsComponent.AnimationKey))
+                AnimationSystem.Play(uid, animPlayer, comp.Animation, FoamVisualsComponent.AnimationKey);
+        }
+
+        if (AppearanceSystem.TryGetData<Color>(uid, FoamVisuals.Color, out var color, args.Component))
+        {
+            if (args.Sprite != null)
+                args.Sprite.Color = color;
+        }
+    }
+}
+
+public enum FoamVisualLayers : byte
+{
+    Base
+}