Make the material ejection control completely generic (#23308)

* Finish decoupling material ejection from lathes

* commented

Content.Client/Materials/UI/MaterialStorageControl.xaml.cs

@@ -0,0 +1,92 @@
+using System.Linq;
+using Content.Shared.Materials;
+using Robust.Client.AutoGenerated;
+using Robust.Client.UserInterface.Controls;
+using Robust.Client.UserInterface.XAML;
+using Robust.Shared.Timing;
+
+namespace Content.Client.Materials.UI;
+
+/// <summary>
+/// This widget is one row in the lathe eject menu.
+/// </summary>
+[GenerateTypedNameReferences]
+public sealed partial class MaterialStorageControl : BoxContainer
+{
+    [Dependency] private readonly IEntityManager _entityManager = default!;
+
+    private EntityUid? _owner;
+
+    private Dictionary<string, int> _currentMaterials = new();
+
+    public MaterialStorageControl()
+    {
+        RobustXamlLoader.Load(this);
+        IoCManager.InjectDependencies(this);
+    }
+
+    public void SetOwner(EntityUid owner)
+    {
+        _owner = owner;
+    }
+
+    protected override void FrameUpdate(FrameEventArgs args)
+    {
+        base.FrameUpdate(args);
+
+        if (_owner == null)
+            return;
+
+        if (!_entityManager.TryGetComponent<MaterialStorageComponent>(_owner, out var materialStorage))
+        {
+            Dispose();
+            return;
+        }
+
+        var canEject = materialStorage.CanEjectStoredMaterials;
+        var mats = materialStorage.Storage.Select(pair => (pair.Key.Id, pair.Value)).ToDictionary();
+        if (_currentMaterials.Equals(mats))
+            return;
+
+        var missing = new List<string>();
+        var extra = new List<string>();
+        foreach (var (mat, amount) in mats)
+        {
+            if (!_currentMaterials.ContainsKey(mat) ||
+                _currentMaterials[mat] == 0 && _currentMaterials[mat] != amount)
+                missing.Add(mat);
+        }
+        foreach (var (mat, amount) in _currentMaterials)
+        {
+            if (!mats.ContainsKey(mat) || amount == 0)
+                extra.Add(mat);
+        }
+
+        var children = new List<MaterialDisplay>();
+        children.AddRange(Children.OfType<MaterialDisplay>());
+
+        foreach (var display in children)
+        {
+            var mat = display.Material;
+
+            if (extra.Contains(mat))
+            {
+                RemoveChild(display);
+                continue;
+            }
+
+            if (!mats.TryGetValue(mat, out var newAmount))
+                continue;
+            display.UpdateVolume(newAmount);
+        }
+
+        foreach (var mat in missing)
+        {
+            var volume = mats[mat];
+            AddChild(new MaterialDisplay(_owner.Value, mat, volume, canEject));
+        }
+
+        _currentMaterials = mats;
+        NoMatsLabel.Visible = ChildCount == 1;
+    }
+}