Joseph Doherty
2a788ed8ac
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
39 lines
1.7 KiB
C#
39 lines
1.7 KiB
C#
using System.Runtime.CompilerServices;
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using ZB.MOM.WW.OtOpcUa.AdminUI.Components.Shared;
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namespace ZB.MOM.WW.OtOpcUa.AdminUI.Uns;
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/// <summary>
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/// Caches each <see cref="RawNode"/>'s context-menu item list (R04 P5). <c>RawTree</c> used to build a
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/// fresh list (and fresh closures) per node on every render, and hand it to that row's
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/// <c>ContextMenu</c> as a new reference each time. The cache is keyed weakly on the node instance, so
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/// a reload (which replaces the child nodes) drops the stale entries with the nodes, and it rebuilds
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/// when anything the menu depends on (picker mode, the node's enabled state) differs.
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/// </summary>
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public sealed class RawNodeMenuCache
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{
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private readonly ConditionalWeakTable<RawNode, Entry> _entries = new();
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/// <summary>Returns the cached menu for <paramref name="node"/>, building it on first use or after a dependency changed.</summary>
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/// <param name="node">The node.</param>
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/// <param name="pickerMode">Whether the tree is in picker mode (picker menus differ entirely).</param>
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/// <param name="build">Builds the menu for the node.</param>
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/// <returns>The menu items.</returns>
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public IReadOnlyList<ContextMenuItem> GetOrBuild(
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RawNode node, bool pickerMode, Func<RawNode, IReadOnlyList<ContextMenuItem>> build)
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{
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if (_entries.TryGetValue(node, out var entry)
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&& entry.PickerMode == pickerMode
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&& entry.Enabled == node.Enabled)
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{
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return entry.Items;
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}
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var items = build(node);
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_entries.AddOrUpdate(node, new Entry(pickerMode, node.Enabled, items));
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return items;
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}
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private sealed record Entry(bool PickerMode, bool Enabled, IReadOnlyList<ContextMenuItem> Items);
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}
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