@perfma/heaven/es/letter-index-list/letter-index-list.js

An UI Framework base [Ant Design V4](https://ant.design/components/overview-cn/) for React.

function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }

function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

function _iterableToArrayLimit(arr, i) { var _i = arr == null ? null : typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"]; if (_i == null) return; var _arr = []; var _n = true; var _d = false; var _s, _e; try { for (_i = _i.call(arr); !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }

function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }

import React, { useState, useEffect } from 'react';
import { classNames, nextTick } from '../_util';
import './letter-index-list.less';

var LetterIndexList = function LetterIndexList(props) {
  var _props$dataSource = props.dataSource,
      dataSource = _props$dataSource === void 0 ? [] : _props$dataSource,
      initialValue = props.initialValue,
      _props$selectable = props.selectable,
      selectable = _props$selectable === void 0 ? true : _props$selectable,
      _props$height = props.height,
      height = _props$height === void 0 ? 400 : _props$height,
      _props$width = props.width,
      width = _props$width === void 0 ? 194 : _props$width,
      onChange = props.onChange,
      itemRender = props.itemRender;

  var _useState = useState(0),
      _useState2 = _slicedToArray(_useState, 2),
      parentOffsetTop = _useState2[0],
      setParentOffsetTop = _useState2[1];

  var listRef = React.useRef();
  useEffect(function () {
    setParentOffsetTop(listRef.current.offsetTop);
  }, []);

  var _useState3 = useState([]),
      _useState4 = _slicedToArray(_useState3, 2),
      letters = _useState4[0],
      setLetters = _useState4[1];

  var _useState5 = useState([]),
      _useState6 = _slicedToArray(_useState5, 2),
      list = _useState6[0],
      setList = _useState6[1];

  useEffect(function () {
    setLetters(dataSource.map(function (val) {
      return val.letter;
    }));
    var trans = [];
    dataSource.forEach(function (group) {
      trans.push({
        isLetter: true,
        id: group.letter.toUpperCase(),
        name: group.letter.toUpperCase()
      });
      group.children.forEach(function (item) {
        trans.push({
          id: item.id,
          name: item.name
        });
      });
    });
    setList(trans);
    nextTick(function () {
      var target = document.querySelector("[data-id=\"".concat(initialValue, "\"]"));

      if (target) {
        var offsetTop = target.offsetTop;
        listRef.current.scrollTo({
          top: offsetTop - listRef.current.offsetTop - 38 // 38 is sticky Letter's height

        });
      }
    });
  }, [dataSource]);

  var _useState7 = useState(''),
      _useState8 = _slicedToArray(_useState7, 2),
      currentGroup = _useState8[0],
      setCurrentGroup = _useState8[1];

  var handleScroll = function handleScroll() {
    var _listRef$current = listRef.current,
        scrollTop = _listRef$current.scrollTop,
        offsetTop = _listRef$current.offsetTop,
        children = _listRef$current.children;
    var curr;

    for (var i = 0; i < children.length; i++) {
      var ele = children[i];

      if (scrollTop >= ele.offsetTop - offsetTop) {
        if (ele.dataset.letter) {
          curr = ele.dataset.letter;
        }
      } else {
        break;
      }
    }

    setParentOffsetTop(offsetTop);
    setCurrentGroup(curr);
  };

  var handleNavgation = function handleNavgation(letter) {
    var target = document.querySelector("[data-letter=\"".concat(letter, "\"]"));

    if (target) {
      var offsetTop = target.offsetTop;
      listRef.current.scrollTo({
        top: offsetTop - parentOffsetTop
      });
    }
  };

  var _useState9 = useState(),
      _useState10 = _slicedToArray(_useState9, 2),
      selected = _useState10[0],
      setSelected = _useState10[1];

  var handleSelect = function handleSelect(val) {
    if (!selectable) return;
    var id = val.id;
    setSelected(id);
    onChange && onChange({
      selected: id,
      item: val
    });
  };

  useEffect(function () {
    setSelected(initialValue);
  }, []);
  return /*#__PURE__*/React.createElement("div", {
    className: "letter-index-list",
    style: {
      height: height,
      width: width
    }
  }, /*#__PURE__*/React.createElement("div", {
    className: "letter-index-list-nav"
  }, letters.map(function (letter) {
    return /*#__PURE__*/React.createElement("div", {
      key: letter,
      className: "letter-index-list-nav-item ".concat(currentGroup === letter && 'is-active'),
      onClick: function onClick() {
        return handleNavgation(letter);
      }
    }, letter);
  })), /*#__PURE__*/React.createElement("div", {
    // @ts-ignore
    ref: listRef,
    className: "letter-index-list-content",
    onScrollCapture: handleScroll
  }, list.map(function (item) {
    return /*#__PURE__*/React.createElement("div", {
      key: item.id,
      className: classNames(['letter-index-list-content-item', item.isLetter && 'is-letter', currentGroup === item.name && 'is-sticky', selected === item.id && 'is-selected']),
      "data-id": item.id,
      "data-letter": item.isLetter ? item.name.toUpperCase() : null,
      onClick: function onClick() {
        return !item.isLetter && handleSelect(item);
      }
    }, !item.isLetter && itemRender ? itemRender(item) : item.name);
  })));
};

export default LetterIndexList;