@fruits-chain/react-native-xiaoshu/lib/module/picker-view/helper/column.js

🌈 React Native UI library

"use strict";

/**
 * 按照某个方向找到可用选项的下标
 */
const findAvailableOptionsIndex = (options, start, end) => {
  const isNext = end - start >= 0;
  for (let iii = start; isNext ? iii <= end : iii >= end; iii += isNext ? 1 : -1) {
    const item = options[iii];
    if (!item.disabled) {
      return iii;
    }
  }
  return -1;
};
export const findUsableOptionIndex = (options, next, index, /** 是否可以翻转查找 */
reverse = true
// eslint-disable-next-line max-params
) => {
  const maxIndex = options.length - 1;
  // 两端的情况不能反转查找
  if (reverse && (index === 0 || index === maxIndex)) {
    reverse = false;
  }

  // 顶端不能继续向上找
  if (index === 0 && !next) {
    next = true;
  }

  // 末端不能继续向下找
  if (index === maxIndex && next) {
    next = false;
  }
  const getEnd = cNext => {
    return cNext ? maxIndex : 0;
  };

  // 以当前为起点向某个方向找
  let nIndex = findAvailableOptionsIndex(options, index, getEnd(next));
  if (nIndex === -1 && reverse) {
    nIndex = findAvailableOptionsIndex(options, index, getEnd(!next));
  }
  return nIndex;
};
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