@mintuz/react-intersect/dist/index.js

A react library that monitors visibility of react components within the viewport and visible parts of overflow scroll elements

'use strict';

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

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; }; }();

var _slicedToArray = function () { function sliceIterator(arr, i) { 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"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

var _react = require('react');

var _react2 = _interopRequireDefault(_react);

var _reactDom = require('react-dom');

var _reactDom2 = _interopRequireDefault(_reactDom);

var _horizon = require('@mintuz/horizon');

var _horizon2 = _interopRequireDefault(_horizon);

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

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; }

var useIntersect = exports.useIntersect = function useIntersect(_ref) {
    var _ref$triggerOnce = _ref.triggerOnce,
        triggerOnce = _ref$triggerOnce === undefined ? false : _ref$triggerOnce,
        intersectionObserverConfig = _ref.intersectionObserverConfig;

    var instanceRef = (0, _react.useRef)(null);

    var _useState = (0, _react.useState)(false),
        _useState2 = _slicedToArray(_useState, 2),
        inView = _useState2[0],
        setInView = _useState2[1];

    var onEntry = function onEntry() {
        setInView(true);
    };

    var onExit = function onExit() {
        setInView(false);
    };

    var ref = (0, _react.useCallback)(function (node) {
        if (instanceRef.current) {
            instanceRef.current.unobserve();
        }

        if (node) {
            var instance = (0, _horizon2.default)({
                onEntry: onEntry,
                onExit: onExit,
                triggerOnce: triggerOnce,
                toObserve: node,
                intersectionObserverConfig: intersectionObserverConfig
            });

            instanceRef.current = instance;
        }
    }, [triggerOnce, intersectionObserverConfig]);

    return [inView, ref];
};

var ReactIntersect = function (_React$Component) {
    _inherits(ReactIntersect, _React$Component);

    function ReactIntersect() {
        var _ref2;

        var _temp, _this, _ret;

        _classCallCheck(this, ReactIntersect);

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

        return _ret = (_temp = (_this = _possibleConstructorReturn(this, (_ref2 = ReactIntersect.__proto__ || Object.getPrototypeOf(ReactIntersect)).call.apply(_ref2, [this].concat(args))), _this), _this.state = {
            inView: false
        }, _this.onEntry = function (entry) {
            if (_this.props.onEntry) {
                _this.props.onEntry(entry);
            }

            _this.setState(function (prevState) {
                var newState = {
                    inView: true
                };

                return _this.props.stateReducer ? _this.props.stateReducer(prevState, newState) : newState;
            });
        }, _this.onExit = function (entry) {
            if (_this.props.onExit) {
                _this.props.onExit(entry);
            }

            _this.setState(function (prevState) {
                var newState = {
                    inView: false
                };

                return _this.props.stateReducer ? _this.props.stateReducer(prevState, newState) : newState;
            });
        }, _temp), _possibleConstructorReturn(_this, _ret);
    }

    _createClass(ReactIntersect, [{
        key: 'shouldComponentUpdate',
        value: function shouldComponentUpdate(nextProps, nextState) {
            return nextState.inView !== this.state.inView;
        }
    }, {
        key: 'componentDidMount',
        value: function componentDidMount() {
            (0, _horizon2.default)({
                onEntry: this.onEntry,
                onExit: this.onExit,
                triggerOnce: this.props.triggerOnce,
                toObserve: _reactDom2.default.findDOMNode(this),
                intersectionObserverConfig: _extends({}, this.props.intersectionObserverConfig)
            });
        }
    }, {
        key: 'render',
        value: function render() {
            return this.props.render(this.state.inView);
        }
    }]);

    return ReactIntersect;
}(_react2.default.Component);

exports.default = ReactIntersect;