@danilandreev/material-docs/utils/usePageScroll.js

material-docs - react framework for easy creating documentation site in material design style.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = usePageScroll;

var _react = _interopRequireDefault(require("react"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

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(n); 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) { if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return; var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_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; }

/**
 * usePageScroll - React hook, used to get page scroll position.
 * @function
 * @returns {{scrollY: number, scrollX: number}}
 * @example
 * const {scrollY, scrollX} = usePageScroll();
 */
function usePageScroll() {
  var _React$useState = _react.default.useState({
    scrollX: 0,
    scrollY: 0
  }),
      _React$useState2 = _slicedToArray(_React$useState, 2),
      scroll = _React$useState2[0],
      setScroll = _React$useState2[1];

  _react.default.useEffect(function () {
    window.addEventListener("scroll", onScrollChange);
    return function () {
      return window.removeEventListener("scroll", onScrollChange);
    };
  }, []);

  function onScrollChange(event) {
    var _window = window,
        scrollX = _window.scrollX,
        scrollY = _window.scrollY;
    setScroll({
      scrollX: scrollX,
      scrollY: scrollY
    });
  }

  return scroll;
}