@antv/s2/esm/utils/indexes.js

effective spreadsheet render core lib

import { isEmpty } from 'lodash';
/**
 * 是否在 视窗索引范围中
 * @param x
 * @param y
 * @param indexes
 */
export const isXYInRange = (x, y, indexes) => {
    const [xMin, xMax, yMin, yMax] = indexes;
    return x >= xMin && x <= xMax && y >= yMin && y <= yMax;
};
export const allIndexes = (indexes) => {
    const [minI, maxI, minJ, maxJ] = indexes;
    const r = [];
    for (let i = minI; i <= maxI; i += 1) {
        for (let j = minJ; j <= maxJ; j += 1) {
            r.push([i, j]);
        }
    }
    return r;
};
/**
 * 计算两个 indexes 的 diff，获取 sourceIndexes -> targetIndexes 过程中新增的和移除的index
 * @param sourceIndexes
 * @param targetIndexes
 */
export const diffIndexes = (sourceIndexes, targetIndexes) => {
    const add = [];
    const remove = [];
    // source 为空
    if (isEmpty(sourceIndexes)) {
        if (isEmpty(targetIndexes)) {
            // 都为空
            return { add, remove };
        }
        // target 不为空
        return { add: allIndexes(targetIndexes), remove };
    }
    // source 不为空，target 为空
    if (isEmpty(targetIndexes)) {
        return { add, remove: allIndexes(sourceIndexes) };
    }
    const [sourceMinI, sourceMaxI, sourceMinJ, sourceMaxJ] = sourceIndexes;
    const [targetMinI, targetMaxI, targetMinJ, targetMaxJ] = targetIndexes;
    // sourceIndexes -> targetIndexes 过程中，remove 掉的单元格
    for (let i = sourceMinI; i <= sourceMaxI; i++) {
        for (let j = sourceMinJ; j <= sourceMaxJ; j++) {
            if (!isXYInRange(i, j, targetIndexes)) {
                remove.push([i, j]);
            }
        }
    }
    // sourceIndexes -> targetIndexes 过程中，add 新增的单元格
    for (let i = targetMinI; i <= targetMaxI; i += 1) {
        for (let j = targetMinJ; j <= targetMaxJ; j += 1) {
            if (!isXYInRange(i, j, sourceIndexes)) {
                add.push([i, j]);
            }
        }
    }
    return {
        add,
        remove,
    };
};
/**
 * 计算 Panel 下所有子 Group的 Indexes Diff
 */
export const diffPanelIndexes = (sourceIndexes, targetIndexes) => {
    const allAdd = [];
    const allRemove = [];
    Object.keys(targetIndexes || {}).forEach((key) => {
        const { add, remove } = diffIndexes((sourceIndexes === null || sourceIndexes === void 0 ? void 0 : sourceIndexes[key]) || [], targetIndexes[key]);
        allAdd.push(...add);
        allRemove.push(...remove);
    });
    return {
        add: allAdd,
        remove: allRemove,
    };
};
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