perf(adminui): RawTree renders a flat Virtualize list, pages 500 per level, caches menus (R04 P5)

The recursive RenderNode rendered every row of an expanded device, and built a fresh context-menu list + closures per node per render. RawTreeRows flattens the expanded tree (explicit stack) into rows rendered by one Virtualize; each level shows 500 children, then a 'Show more' row. RawNodeMenuCache keys menus weakly on the node instance and rebuilds on a picker-mode or Enabled change. Refs #745 Claude-Session: https://claude.ai/code/session_01Ub9hGmYLQvn9XETzw7CMsT
2026-10-22 17:33:45 -04:00
parent 10b83d69c5
commit 2a788ed8ac
5 changed files with 320 additions and 25 deletions
@@ -0,0 +1,38 @@
+using System.Runtime.CompilerServices;
+using ZB.MOM.WW.OtOpcUa.AdminUI.Components.Shared;
+
+namespace ZB.MOM.WW.OtOpcUa.AdminUI.Uns;
+
+/// <summary>
+///     Caches each <see cref="RawNode"/>'s context-menu item list (R04 P5). <c>RawTree</c> used to build a
+///     fresh list (and fresh closures) per node on every render, and hand it to that row's
+///     <c>ContextMenu</c> as a new reference each time. The cache is keyed weakly on the node instance, so
+///     a reload (which replaces the child nodes) drops the stale entries with the nodes, and it rebuilds
+///     when anything the menu depends on (picker mode, the node's enabled state) differs.
+/// </summary>
+public sealed class RawNodeMenuCache
+{
+    private readonly ConditionalWeakTable<RawNode, Entry> _entries = new();
+
+    /// <summary>Returns the cached menu for <paramref name="node"/>, building it on first use or after a dependency changed.</summary>
+    /// <param name="node">The node.</param>
+    /// <param name="pickerMode">Whether the tree is in picker mode (picker menus differ entirely).</param>
+    /// <param name="build">Builds the menu for the node.</param>
+    /// <returns>The menu items.</returns>
+    public IReadOnlyList<ContextMenuItem> GetOrBuild(
+        RawNode node, bool pickerMode, Func<RawNode, IReadOnlyList<ContextMenuItem>> build)
+    {
+        if (_entries.TryGetValue(node, out var entry)
+            && entry.PickerMode == pickerMode
+            && entry.Enabled == node.Enabled)
+        {
+            return entry.Items;
+        }
+
+        var items = build(node);
+        _entries.AddOrUpdate(node, new Entry(pickerMode, node.Enabled, items));
+        return items;
+    }
+
+    private sealed record Entry(bool PickerMode, bool Enabled, IReadOnlyList<ContextMenuItem> Items);
+}