add: Item Manager

src/SkinManagers/SkinPacker.cs

@@ -0,0 +1,43 @@
+using Godot;
+
+namespace Polonium.SkinManagers;
+
+public abstract partial class SkinPacker : Node2D
+{
+    public Node2D SkinCollector { get; set; }
+    protected Skin[] CollectedSkins => SkinCollector
+        .GetChildren()
+        .OfType<Skin>()
+        .ToArray();
+
+    private Vector2I BackingFrameCoords { get; set; }
+
+    [Export]
+    protected Vector2I FrameCoords
+    {
+        get => BackingFrameCoords;
+        set
+        {
+            BackingFrameCoords = value;
+            UpdateSkins();
+        }
+    }
+
+    private void UpdateSkins()
+    {
+        if (SkinCollector is not null)
+            foreach(Skin skin in CollectedSkins)
+                skin.FrameCoords = FrameCoords;
+    }
+
+    public AnimationPlayer SyncPlayer { get; set; }
+
+    public override void _Ready()
+    {
+        base._Ready();
+        SyncPlayer = GetNode<AnimationPlayer>("AnimationPlayer");
+        SkinCollector = GetNode<Node2D>("SkinCollector");
+    }
+
+
+}