react-simple-scroll-container/lib/components/ScrollContainer/index.js

A simple scroll container for React.

'use strict';

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

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 _class, _temp2;

var _react = require('react');

var _react2 = _interopRequireDefault(_react);

var _propTypes = require('prop-types');

var _propTypes2 = _interopRequireDefault(_propTypes);

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

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 ScrollContainer = (_temp2 = _class = function (_React$Component) {
    _inherits(ScrollContainer, _React$Component);

    function ScrollContainer() {
        var _ref;

        var _temp, _this, _ret;

        _classCallCheck(this, ScrollContainer);

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

        return _ret = (_temp = (_this = _possibleConstructorReturn(this, (_ref = ScrollContainer.__proto__ || Object.getPrototypeOf(ScrollContainer)).call.apply(_ref, [this].concat(args))), _this), _this.state = {
            activeElement: ''
        }, _this.elements = {}, _this.getActiveElement = function () {
            var result = _this.state.activeElement;
            var containerScrollTop = _this.container.scrollTop;
            Object.keys(_this.elements).forEach(function (key) {
                var element = (0, _reactDom.findDOMNode)(_this.elements[key]);
                // if offset height === 0, the element is empty
                if (element.offsetHeight !== 0) {
                    var isActive = containerScrollTop >= element.offsetTop - _this.props.topScrollOffset && containerScrollTop <= element.offsetHeight + element.offsetTop;

                    if (isActive) {
                        result = key;
                    }
                }
            });
            return result;
        }, _this.handleScroll = function (e) {
            var activeElement = _this.getActiveElement();
            if (_this.state.activeElement !== activeElement) {
                console.log('active!');
                // Do the call back with the active id
                _this.setState({
                    activeElement: activeElement
                });
                _this.props.topScrollCallback(activeElement);
            }
        }, _this.getNode = function (name) {
            return (0, _reactDom.findDOMNode)(_this.elements[name]);
        }, _this.register = function (name, ref) {
            _this.elements[name] = ref;
        }, _this.unregister = function (name) {
            delete _this.elements[name];
        }, _temp), _possibleConstructorReturn(_this, _ret);
    }

    _createClass(ScrollContainer, [{
        key: 'getChildContext',
        value: function getChildContext() {
            return {
                scroll: {
                    register: this.register,
                    unregister: this.unregister
                }
            };
        }
    }, {
        key: 'render',
        value: function render() {
            var _this2 = this;

            return _react2.default.createElement(
                'div',
                {
                    style: _extends({ overflowY: 'scroll', position: 'relative' }, this.props.extraStyle),
                    id: this.props.containerId,
                    className: this.props.extraClassName,
                    onScroll: this.props.topScroll ? this.handleScroll : function () {
                        return null;
                    },
                    ref: function ref(_ref2) {
                        return _this2.container = _ref2;
                    }
                },
                this.props.children
            );
        }
    }]);

    return ScrollContainer;
}(_react2.default.Component), _class.childContextTypes = {
    scroll: _propTypes2.default.object
}, _temp2);


ScrollContainer.defaultProps = {
    containerId: '',
    topScroll: false,
    topScrollCallback: function topScrollCallback() {
        return null;
    },
    topScrollOffset: 10,
    extraStyle: {},
    extraClassName: ''
};

ScrollContainer.propTypes = {
    containerId: _propTypes2.default.string,
    topScroll: _propTypes2.default.bool,
    topScrollCallback: _propTypes2.default.func,
    topScrollOffset: _propTypes2.default.number,
    extraStyle: _propTypes2.default.object,
    extraClassName: _propTypes2.default.string
};

exports.default = ScrollContainer;
module.exports = exports['default'];