Initial commit: AetherBags + KamiToolKit for FC Gitea

Co-authored-by: Cursor <cursoragent@cursor.com>

KamiToolKit/Nodes/Component/TreeListNode.cs

@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+
+namespace KamiToolKit.Nodes;
+
+public class TreeListNode : SimpleComponentNode {
+
+    private readonly SimpleComponentNode childContainer;
+
+    private readonly List<TreeListCategoryNode> children = [];
+
+    public ReadOnlyCollection<TreeListCategoryNode> CategoryNodes => children.AsReadOnly();
+
+    public TreeListNode() {
+        childContainer = new SimpleComponentNode();
+        childContainer.AttachNode(this);
+    }
+
+    public float CategoryVerticalSpacing { get; set; } = 4.0f;
+
+    public Action<float>? OnLayoutUpdate { get; set; }
+
+    protected override void OnSizeChanged() {
+        base.OnSizeChanged();
+
+        childContainer.Width = Width;
+    }
+
+    public void AddCategoryNode(TreeListCategoryNode node) {
+        RefreshLayout();
+
+        children.Add(node);
+
+        node.NodeId = (uint)children.Count + 1;
+        node.Width = childContainer.Width;
+        node.Y = childContainer.Height;
+        node.AttachNode(childContainer);
+        node.ParentTreeListNode = this;
+
+        childContainer.Height += node.Height + CategoryVerticalSpacing;
+    }
+
+    public void RefreshLayout() {
+        childContainer.Height = 0.0f;
+
+        foreach (var child in children) {
+            if (!child.IsVisible) continue;
+
+            child.Y = childContainer.Height;
+            childContainer.Height += child.Height + CategoryVerticalSpacing;
+            child.UpdateChildrenNodeId();
+        }
+
+        OnLayoutUpdate?.Invoke(childContainer.Height);
+    }
+}