@1771technologies/lytenyte-pro/dist/cell-selection/expand-cell-selection-down.js

Blazingly fast headless React data grid with 100s of features.

import { getRootCell } from "./get-root-cell.js";
export function expandCellSelectionDown(grid, meta) {
    const cellSelections = grid.state.cellSelections.get();
    const rect = cellSelections.at(-1);
    const pivot = grid.internal.cellSelectionPivot.get();
    if (!rect || !pivot)
        return;
    if (meta) {
        const rowCount = grid.state.rowDataStore.rowCount.get();
        if (pivot.rowStart === rowCount - 1)
            return;
        const next = { ...rect, rowStart: pivot.rowStart, rowEnd: rowCount };
        const nextSelections = [...cellSelections];
        nextSelections[nextSelections.length - 1] = next;
        grid.state.cellSelections.set(nextSelections);
        return;
    }
    let next;
    let focusRow;
    if (rect.rowStart < pivot.rowStart) {
        let rowOffset = 1;
        for (let i = rect.columnStart; i < rect.columnEnd; i++) {
            const cell = getRootCell(grid, rect.rowStart, i);
            if (cell)
                rowOffset = Math.max(rowOffset, cell.rowSpan);
        }
        focusRow = rect.rowStart + rowOffset;
        next = { ...rect, rowStart: focusRow };
    }
    else {
        focusRow = rect.rowEnd + 1;
        next = { ...rect, rowEnd: focusRow };
        focusRow -= 1;
    }
    grid.api.scrollIntoView({ row: focusRow });
    const nextSelections = [...cellSelections];
    nextSelections[nextSelections.length - 1] = next;
    grid.state.cellSelections.set(nextSelections);
}