@antv/s2/esm/utils/interaction/scroll.js

effective spreadsheet render core lib

import { isNil } from 'lodash';
import { FrozenGroupArea } from '../../common';
import { ScrollDirection } from '../../common/constant/interaction';
// 获取滚动指定列到视口内的滚动 x 轴 Offset。滚动到视口边缘位置，左侧和右侧视滚动方向而定。
export const getScrollOffsetForCol = (colIndex, direction, spreadsheet) => {
    const { facet } = spreadsheet;
    const { viewportWidth } = facet.panelBBox;
    const areas = facet === null || facet === void 0 ? void 0 : facet.frozenGroupAreas;
    const frozenColWidth = areas[FrozenGroupArea.Col].width;
    const frozenTrailingColWidth = areas[FrozenGroupArea.TrailingCol].width;
    const colNode = facet.getColLeafNodes()[colIndex];
    if (direction === ScrollDirection.SCROLL_UP) {
        return colNode.x - frozenColWidth;
    }
    return colNode.x + colNode.width - (viewportWidth - frozenTrailingColWidth);
};
// 获取滚动指定行到视口内的滚动 y 轴 Offset。滚动到视口边缘位置，上侧和下侧视滚动方向而定。
export const getScrollOffsetForRow = (rowIndex, direction, spreadsheet) => {
    const { facet } = spreadsheet;
    const { getCellOffsetY } = facet.viewCellHeights;
    const { viewportHeight } = facet.panelBBox;
    const rowOffset = getCellOffsetY(rowIndex + 1);
    if (isNil(rowOffset)) {
        return 0;
    }
    const areas = facet === null || facet === void 0 ? void 0 : facet.frozenGroupAreas;
    const frozenRowHeight = areas[FrozenGroupArea.Row].height;
    const frozenTrailingRowHeight = areas[FrozenGroupArea.TrailingRow].height;
    if (direction === ScrollDirection.SCROLL_UP) {
        return getCellOffsetY(rowIndex) - frozenRowHeight;
    }
    return rowOffset - (viewportHeight - frozenTrailingRowHeight);
};
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