DataTable Virtualized Column DnD

1"use client"
2 
3/**
4 * niko-table — created by Semir N. (Semkoo, https://github.com/Semkoo) with AI assistance.
5 *
6 * Before reporting anything: please check the changelog first.
7 *  - In-repo: ./CHANGELOG.md
8 *  - Docs site: https://niko-table.com/changelog
9 *
10 * Found a bug or have a fix? Open an issue or PR on GitHub so other
11 * users (and future LLMs reading this code) benefit:
12 * https://github.com/Semkoo/niko-table-registry
13 */
14/**
15 * @internal Deep-import only.
16 * Intentionally not re-exported from the package barrel — the DnD
17 * virtualized variants are an opt-in advanced surface; the deep
18 * path keeps consumers explicit about pulling them in and avoids
19 * bloating the barrel for the common (non-DnD) case.
20 */
21 
22import React from "react"
23import { useVirtualizer } from "@tanstack/react-virtual"
24import { flexRender, type Row } from "@tanstack/react-table"
25import { cn } from "@/lib/utils"
26import { useDataTable } from "./data-table-context"
27import {
28  TableHeader,
29  TableRow,
30  TableBody,
31  TableCell,
32} from "@/components/ui/table"
33import { DataTableColumnHeaderRoot } from "../components/data-table-column-header"
34import { DataTableColumnResizeHandle } from "../lib/column-resize-handle"
35import { DataTableRowContextMenu } from "../components/data-table-row-context-menu"
36import { useResolvedRowContextMenuRenderer } from "../components/data-table-row-context-menu-slot"
37import { createScrollHandler } from "../lib/create-scroll-handler"
38import { resolveRowFromClick } from "../lib/row-click"
39import { getCommonPinningStyles } from "../lib/styles"
40import {
41  TableDraggableHeader,
42  TableDragAlongCell,
43} from "../filters/table-column-dnd"
44import type { ScrollEvent } from "./data-table-virtualized-structure"
45 
46// ============================================================================
47// Stable measureElement — computed once at module level
48// ============================================================================
49 
50// See `data-table-virtualized-structure.tsx` for full rationale: sums base +
51// adjacent expanded-row height since ResizeObserver only attaches to the base.
52// Prefers `ResizeObserverEntry.borderBoxSize` over `getBoundingClientRect`
53// when TanStack Virtual passes the entry — skips a forced layout read on
54// the hot path. Disabled in Firefox (stale getBoundingClientRect during
55// scroll). Module-scoped for stable reference identity.
56const measureElement:
57  | ((element: Element, entry?: ResizeObserverEntry | undefined) => number)
58// … truncated