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

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

import { getRootCell } from "./get-root-cell.js";
export function expandCellSelectionStart(grid, meta) {
    const selections = grid.state.cellSelections.get();
    const cellSelectionPivot = grid.internal.cellSelectionPivot.get();
    const rect = selections.at(-1);
    const pivot = cellSelectionPivot;
    if (!rect || !pivot)
        return;
    if (meta) {
        if (pivot.columnStart === 0)
            return;
        const next = { ...rect, columnStart: 0, columnEnd: pivot.columnEnd };
        const nextSelections = [...selections];
        nextSelections[nextSelections.length - 1] = next;
        grid.state.cellSelections.set(nextSelections);
        return;
    }
    let next;
    let focusColumn;
    if (rect.columnEnd > pivot.columnEnd) {
        let colOffset = 1;
        for (let i = rect.rowStart; i < rect.rowEnd; i++) {
            const cell = getRootCell(grid, i, rect.columnEnd - 1);
            if (cell)
                colOffset = Math.max(colOffset, cell.colSpan);
        }
        focusColumn = rect.columnEnd - colOffset;
        next = { ...rect, columnEnd: focusColumn };
        focusColumn -= 1;
    }
    else {
        focusColumn = rect.columnStart - 1;
        next = { ...rect, columnStart: focusColumn };
    }
    grid.api.scrollIntoView({ column: focusColumn });
    const nextSelections = [...selections];
    nextSelections[nextSelections.length - 1] = next;
    grid.state.cellSelections.set(nextSelections);
}