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

wix-style-react

import _classCallCheck from "@babel/runtime/helpers/classCallCheck";
import _createClass from "@babel/runtime/helpers/createClass";
import _assertThisInitialized from "@babel/runtime/helpers/assertThisInitialized";
import _inherits from "@babel/runtime/helpers/inherits";
import _possibleConstructorReturn from "@babel/runtime/helpers/possibleConstructorReturn";
import _getPrototypeOf from "@babel/runtime/helpers/getPrototypeOf";
import _defineProperty from "@babel/runtime/helpers/defineProperty";

function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }

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 = /*#__PURE__*/function (_Component) {
  _inherits(InfiniteScroll, _Component);

  var _super = _createSuper(InfiniteScroll);

  function InfiniteScroll(props) {
    var _this;

    _classCallCheck(this, InfiniteScroll);

    _this = _super.call(this, props);

    _defineProperty(_assertThisInitialized(_this), "detachScrollListener", function () {});

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

  _createClass(InfiniteScroll, [{
    key: "componentDidMount",
    value: function componentDidMount() {
      var _this$props$data;

      this.pageLoaded = this.props.pageStart;
      this.attachScrollListener();

      if (this.props.initialLoad) {
        this.scrollListener();
      } // when component mounts try to load more only when initial data was already rendered
      else if ((_this$props$data = this.props.data) !== null && _this$props$data !== void 0 && _this$props$data.length) {
          var _this$scrollComponent;

          ((_this$scrollComponent = this.scrollComponent) === null || _this$scrollComponent === void 0 ? void 0 : _this$scrollComponent.scrollHeight) && this.scrollListener();
        }
    }
  }, {
    key: "componentDidUpdate",
    value: function componentDidUpdate(prevProps) {
      var _prevProps$data, _this$props$data2;

      this.attachScrollListener(); // scroll element might be not scrollable - trigger scroll listener when new data changes the scroll element height

      if (((_prevProps$data = prevProps.data) === null || _prevProps$data === void 0 ? void 0 : _prevProps$data.length) !== ((_this$props$data2 = this.props.data) === null || _this$props$data2 === void 0 ? void 0 : _this$props$data2.length)) {
        var _this$scrollComponent2;

        // To avoid infinite loop of `loadMore` in `jsdom` we require the scroll element to have height before we trigger `scrollListener` as a reaction to new `props.data`.
        ((_this$scrollComponent2 = this.scrollComponent) === null || _this$scrollComponent2 === void 0 ? void 0 : _this$scrollComponent2.scrollHeight) && this.scrollListener();
      }
    }
  }, {
    key: "render",
    value: function render() {
      var _this2 = this;

      var _this$props = this.props,
          children = _this$props.children,
          hasMore = _this$props.hasMore,
          loader = _this$props.loader,
          scrollElement = _this$props.scrollElement,
          dataHook = _this$props.dataHook;
      var ref;

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

      return /*#__PURE__*/React.createElement('div', {
        ref: ref,
        'data-hook': dataHook
      }, 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;

      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 default loader for all your `InfiniteScroll` components

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

  return InfiniteScroll;
}(Component);

_defineProperty(InfiniteScroll, "propTypes", {
  hasMore: PropTypes.bool,
  initialLoad: PropTypes.bool,
  data: PropTypes.array,
  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
});

_defineProperty(InfiniteScroll, "defaultProps", {
  hasMore: false,
  initialLoad: true,
  pageStart: 0,
  threshold: 250,
  useWindow: true,
  isReverse: false,
  scrollElement: null
});

export { InfiniteScroll as default };