@cantonjs/react-scroll-view/es/components/Loading.js

react scroll component using intersection observer API

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; }; }();

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';

var style = { transition: 'opacity 0.3s' };

var Loading = function (_Component) {
	_inherits(Loading, _Component);

	function Loading() {
		var _ref;

		var _temp, _this, _ret;

		_classCallCheck(this, Loading);

		for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
			args[_key] = arguments[_key];
		}

		return _ret = (_temp = (_this = _possibleConstructorReturn(this, (_ref = Loading.__proto__ || Object.getPrototypeOf(Loading)).call.apply(_ref, [this].concat(args))), _this), _this.highlighted = 0, _this.circles = [6, 20, 34], _temp), _possibleConstructorReturn(_this, _ret);
	}

	_createClass(Loading, [{
		key: 'componentDidMount',
		value: function componentDidMount() {
			var _this2 = this;

			var length = this.circles.length;

			this.intervalId = setInterval(function () {
				var next = _this2.highlighted + 1;
				_this2.highlighted = next >= length ? 0 : next;
				_this2.forceUpdate();
			}, 300);
		}
	}, {
		key: 'shouldComponentUpdate',
		value: function shouldComponentUpdate() {
			return false;
		}
	}, {
		key: 'componentWillUnmount',
		value: function componentWillUnmount() {
			clearInterval(this.intervalId);
		}
	}, {
		key: 'render',
		value: function render() {
			var color = this.props.color,
			    highlighted = this.highlighted,
			    circles = this.circles;

			return React.createElement(
				'svg',
				{
					xmlns: 'http://www.w3.org/2000/svg',
					viewBox: '0 0 40 40',
					width: '32px',
					height: '32px'
				},
				circles.map(function (cx, index) {
					return React.createElement('circle', {
						key: index,
						cx: cx,
						cy: '20',
						r: '3',
						fill: color,
						opacity: highlighted === index ? 1 : 0.2,
						style: style
					});
				})
			);
		}
	}]);

	return Loading;
}(Component);

Loading.propTypes = {
	color: PropTypes.string.isRequired
};
export default Loading;