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

react scroll component using intersection observer API

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

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 _objectWithoutProperties(obj, keys) { var target = {}; for (var i in obj) { if (keys.indexOf(i) >= 0) continue; if (!Object.prototype.hasOwnProperty.call(obj, i)) continue; target[i] = obj[i]; } return target; }

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 createStyles from './RefreshControlObserver.styles';
import React, { Component } from 'react';
import PropTypes from 'prop-types';
import { RefreshContext } from '../Contexts';
import { PullThreshold } from '../constants';

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

	function RefreshControlObserver() {
		var _ref;

		var _temp, _this, _ret;

		_classCallCheck(this, RefreshControlObserver);

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

		return _ret = (_temp = (_this = _possibleConstructorReturn(this, (_ref = RefreshControlObserver.__proto__ || Object.getPrototypeOf(RefreshControlObserver)).call.apply(_ref, [this].concat(args))), _this), _this.styles = createStyles(), _this.state = {
			isActive: false
		}, _this.domRef = function (dom) {
			_this.dom = dom;
		}, _this.renderChildren = function (refreshState) {
			if (!_this.refreshState) {
				_this.refreshState = refreshState;
				refreshState.mount(_this);
			}

			var _this2 = _this,
			    _this2$props = _this2.props,
			    children = _this2$props.children,
			    style = _this2$props.style,
			    isRefreshing = _this2$props.isRefreshing,
			    onRefresh = _this2$props.onRefresh,
			    other = _objectWithoutProperties(_this2$props, ['children', 'style', 'isRefreshing', 'onRefresh']),
			    isActive = _this2.state.isActive,
			    styles = _this2.styles;

			return React.createElement(
				'div',
				_extends({}, other, {
					style: styles.container(style, isRefreshing),
					ref: _this.domRef
				}),
				children({ isRefreshing: isRefreshing, isActive: isActive })
			);
		}, _temp), _possibleConstructorReturn(_this, _ret);
	}

	_createClass(RefreshControlObserver, [{
		key: 'componentDidUpdate',
		value: function componentDidUpdate(prevProps) {
			if (!prevProps.isRefreshing && this.props.isRefreshing) {
				this.enableTransition();
				this.setHeight(PullThreshold);
			} else if (prevProps.isRefreshing && !this.props.isRefreshing) {
				this.end();
				this.setHeight(0);
			}
		}
	}, {
		key: 'componentWillUnmount',
		value: function componentWillUnmount() {
			this.refreshState.unmount();
		}
	}, {
		key: 'requestRefresh',
		value: function requestRefresh() {
			var onRefresh = this.props.onRefresh;

			onRefresh && onRefresh();
		}
	}, {
		key: 'setHeight',
		value: function setHeight(val) {
			var max = PullThreshold;
			var height = val > 0 ? val > max ? max + (val - max) / 2 : val : 0;
			var isActive = this.state.isActive,
			    dom = this.dom;

			dom.style.height = height + 'px';

			if (height >= max && !isActive) {
				this.setState({ isActive: true });
			} else if (height < max && isActive) {
				this.setState({ isActive: false });
			}
		}
	}, {
		key: 'enableTransition',
		value: function enableTransition() {
			this.dom.style.transition = 'height 0.3s ease-out, min-height 0.3s ease-out';
		}
	}, {
		key: 'disableTransition',
		value: function disableTransition() {
			this.dom.style.transition = 'none';
		}
	}, {
		key: 'end',
		value: function end() {
			if (this.state.isActive) {
				this.enableTransition();
				this.setState({ isActive: false });
			}
		}
	}, {
		key: 'attemptToRefresh',
		value: function attemptToRefresh() {
			var _props = this.props,
			    onRefresh = _props.onRefresh,
			    isRefreshing = _props.isRefreshing,
			    isActive = this.state.isActive;

			if (onRefresh && !isRefreshing && isActive) {
				onRefresh();
			}
			this.end();
			if (isRefreshing) {
				this.setHeight(PullThreshold);
			} else {
				this.setHeight(0);
			}
		}
	}, {
		key: 'render',
		value: function render() {
			return React.createElement(
				RefreshContext.Consumer,
				null,
				this.renderChildren
			);
		}
	}]);

	return RefreshControlObserver;
}(Component);

RefreshControlObserver.propTypes = {
	isRefreshing: PropTypes.bool.isRequired,
	onRefresh: PropTypes.func,
	style: PropTypes.object,
	children: PropTypes.func.isRequired
};
export default RefreshControlObserver;