Trash bag visualizer (#7199)

Content.Server/Storage/EntitySystems/StorageFillVisualizerSystem.cs

@@ -0,0 +1,42 @@
+using Content.Server.Storage.Components;
+using Content.Shared.Rounding;
+using Content.Shared.Storage.Components;
+using Robust.Shared.Containers;
+
+namespace Content.Server.Storage.EntitySystems;
+
+public sealed class StorageFillVisualizerSystem : EntitySystem
+{
+    public override void Initialize()
+    {
+        base.Initialize();
+        SubscribeLocalEvent<StorageFillVisualizerComponent, ComponentInit>(OnInit);
+        SubscribeLocalEvent<StorageFillVisualizerComponent, EntInsertedIntoContainerMessage>(OnInserted);
+        SubscribeLocalEvent<StorageFillVisualizerComponent, EntRemovedFromContainerMessage>(OnRemoved);
+    }
+
+    private void OnInit(EntityUid uid, StorageFillVisualizerComponent component, ComponentInit args)
+    {
+        UpdateAppearance(uid, component: component);
+    }
+
+    private void OnInserted(EntityUid uid, StorageFillVisualizerComponent component, EntInsertedIntoContainerMessage args)
+    {
+        UpdateAppearance(uid, component: component);
+    }
+
+    private void OnRemoved(EntityUid uid, StorageFillVisualizerComponent component, EntRemovedFromContainerMessage args)
+    {
+        UpdateAppearance(uid, component: component);
+    }
+
+    private void UpdateAppearance(EntityUid uid, ServerStorageComponent? storage = null, AppearanceComponent? appearance = null,
+        StorageFillVisualizerComponent? component = null)
+    {
+        if (!Resolve(uid, ref storage, ref appearance, ref component, false))
+            return;
+
+        var level = ContentHelpers.RoundToEqualLevels(storage.StorageUsed, storage.StorageCapacityMax, component.MaxFillLevels);
+        appearance.SetData(StorageFillVisuals.FillLevel, level);
+    }
+}