ndla-ui
Version:
UI component library for NDLA.
105 lines (81 loc) • 7 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", {
value: true
});
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 _react = require('react');
var _react2 = _interopRequireDefault(_react);
var _propTypes = require('prop-types');
var _propTypes2 = _interopRequireDefault(_propTypes);
var _throttle = require('lodash/throttle');
var _throttle2 = _interopRequireDefault(_throttle);
var _Fade = require('./Fade');
var _Fade2 = _interopRequireDefault(_Fade);
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; } /**
* Copyright (c) 2016-present, NDLA.
*
* This source code is licensed under the GPLv3 license found in the
* LICENSE file in the root directory of this source tree.
*
*/
var DisplayOnPageYOffset = function (_Component) {
_inherits(DisplayOnPageYOffset, _Component);
function DisplayOnPageYOffset(props) {
_classCallCheck(this, DisplayOnPageYOffset);
var _this = _possibleConstructorReturn(this, (DisplayOnPageYOffset.__proto__ || Object.getPrototypeOf(DisplayOnPageYOffset)).call(this, props));
_this.state = {
show: props.yOffsetMin === 0
};
_this.handleScroll = (0, _throttle2.default)(_this.handleScroll.bind(_this), 50);
return _this;
}
_createClass(DisplayOnPageYOffset, [{
key: 'componentDidMount',
value: function componentDidMount() {
if (window) {
window.addEventListener('scroll', this.handleScroll);
this.handleScroll();
}
}
}, {
key: 'componentWillUnmount',
value: function componentWillUnmount() {
if (window) {
window.removeEventListener('scroll', this.handleScroll);
}
}
}, {
key: 'handleScroll',
value: function handleScroll() {
if (window.pageYOffset >= this.props.yOffsetMin && (this.props.yOffsetMax === null || window.pageYOffset <= this.props.yOffsetMax)) {
if (!this.state.show) {
this.setState({ show: true });
}
} else if (this.state.show) {
this.setState({ show: false });
}
}
}, {
key: 'render',
value: function render() {
return _react2.default.createElement(
_Fade2.default,
{ 'in': this.state.show },
this.props.children
);
}
}]);
return DisplayOnPageYOffset;
}(_react.Component);
exports.default = DisplayOnPageYOffset;
DisplayOnPageYOffset.propTypes = {
children: _propTypes2.default.node.isRequired,
yOffsetMin: _propTypes2.default.number.isRequired,
yOffsetMax: _propTypes2.default.number
};
DisplayOnPageYOffset.defaultProps = {
yOffsetMax: null
};