wix-style-react/dist/es/src/utils/InfiniteScroll.js

wix-style-react

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

var _class, _temp;

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass; }

import React, { Component } from 'react';
import PropTypes from 'prop-types';

// This is a copy of https://github.com/CassetteRocks/react-infinite-scroller with https://github.com/CassetteRocks/react-infinite-scroller/pull/38/files merged
var InfiniteScroll = (_temp = _class = function (_Component) {
  _inherits(InfiniteScroll, _Component);

  function InfiniteScroll(props) {
    _classCallCheck(this, InfiniteScroll);

    var _this = _possibleConstructorReturn(this, (InfiniteScroll.__proto__ || Object.getPrototypeOf(InfiniteScroll)).call(this, props));

    _this.detachScrollListener = function () {};

    _this.scrollListener = _this.scrollListener.bind(_this);
    return _this;
  }

  _createClass(InfiniteScroll, [{
    key: 'componentDidMount',
    value: function componentDidMount() {
      this.pageLoaded = this.props.pageStart;
      this.attachScrollListener();
      if (this.props.initialLoad) {
        this.scrollListener();
      }
    }
  }, {
    key: 'componentDidUpdate',
    value: function componentDidUpdate() {
      this.attachScrollListener();
    }
  }, {
    key: 'render',
    value: function render() {
      var _this2 = this;

      var _props = this.props,
          children = _props.children,
          hasMore = _props.hasMore,
          loader = _props.loader,
          scrollElement = _props.scrollElement;

      var ref = void 0;

      if (scrollElement) {
        ref = function ref() {
          return _this2.scrollComponent = scrollElement;
        };
      } else {
        ref = function ref(node) {
          return _this2.scrollComponent = node;
        };
      }

      return React.createElement('div', { ref: ref }, children, hasMore && (loader || this._defaultLoader));
    }
  }, {
    key: 'calculateTopPosition',
    value: function calculateTopPosition(el) {
      if (!el) {
        return 0;
      }
      return el.offsetTop + this.calculateTopPosition(el.offsetParent);
    }
  }, {
    key: 'scrollListener',
    value: function scrollListener() {
      var el = this.scrollComponent;
      var offset = void 0;

      if (this.props.scrollElement) {
        if (this.props.isReverse) {
          offset = el.scrollTop;
        } else {
          offset = el.scrollHeight - el.scrollTop - el.clientHeight;
        }
      } else if (this.props.useWindow) {
        var scrollTop = window.pageYOffset !== undefined ? window.pageYOffset : (document.documentElement || document.body.parentNode || document.body).scrollTop;
        if (this.props.isReverse) {
          offset = scrollTop;
        } else {
          offset = this.calculateTopPosition(el) + el.offsetHeight - scrollTop - window.innerHeight;
        }
      } else if (this.props.isReverse) {
        offset = el.parentNode.scrollTop;
      } else {
        offset = el.scrollHeight - el.parentNode.scrollTop - el.parentNode.clientHeight;
      }

      if (offset < Number(this.props.threshold)) {
        this.detachScrollListener();
        // Call loadMore after detachScrollListener to allow for non-async loadMore functions
        if (typeof this.props.loadMore === 'function') {
          this.props.loadMore(this.pageLoaded += 1);
        }
      }
    }
  }, {
    key: 'attachScrollListener',
    value: function attachScrollListener() {
      var _this3 = this;

      this.detachScrollListener();

      if (!this.props.hasMore) {
        return;
      }

      var scrollEl = window;
      if (this.props.scrollElement) {
        scrollEl = this.scrollComponent;
      } else if (this.props.useWindow === false) {
        scrollEl = this.scrollComponent.parentNode;
      }

      scrollEl.addEventListener('scroll', this.scrollListener);
      scrollEl.addEventListener('resize', this.scrollListener);

      this.detachScrollListener = function () {
        scrollEl.removeEventListener('scroll', _this3.scrollListener);
        scrollEl.removeEventListener('resize', _this3.scrollListener);
        _this3.detachScrollListener = function () {};
      };
    }
  }, {
    key: 'componentWillUnmount',
    value: function componentWillUnmount() {
      this.detachScrollListener();
    }

    // Set a defaut loader for all your `InfiniteScroll` components

  }, {
    key: 'setDefaultLoader',
    value: function setDefaultLoader(loader) {
      this._defaultLoader = loader;
    }
  }]);

  return InfiniteScroll;
}(Component), _class.propTypes = {
  hasMore: PropTypes.bool,
  initialLoad: PropTypes.bool,
  loadMore: PropTypes.func.isRequired,
  pageStart: PropTypes.number,
  threshold: PropTypes.number,
  useWindow: PropTypes.bool,
  isReverse: PropTypes.bool,
  scrollElement: PropTypes.object,
  children: PropTypes.node,
  loader: PropTypes.node
}, _class.defaultProps = {
  hasMore: false,
  initialLoad: true,
  pageStart: 0,
  threshold: 250,
  useWindow: true,
  isReverse: false,
  scrollElement: null
}, _temp);
export { InfiniteScroll as default };