@collectionspace/cspace-public-browser/lib/components/layout/ScrollTopButton.js

CollectionSpace public browser

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
var _react = _interopRequireWildcard(require("react"));
var _reactIntl = require("react-intl");
var _IconButton = _interopRequireDefault(require("./IconButton"));
var _ScrollTopButton = _interopRequireDefault(require("../../../styles/cspace/ScrollTopButton.css"));
function _interopRequireDefault(e) { return e && e.__esModule ? e : { default: e }; }
function _getRequireWildcardCache(e) { if ("function" != typeof WeakMap) return null; var r = new WeakMap(), t = new WeakMap(); return (_getRequireWildcardCache = function (e) { return e ? t : r; })(e); }
function _interopRequireWildcard(e, r) { if (!r && e && e.__esModule) return e; if (null === e || "object" != typeof e && "function" != typeof e) return { default: e }; var t = _getRequireWildcardCache(r); if (t && t.has(e)) return t.get(e); var n = { __proto__: null }, a = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var u in e) if ("default" !== u && {}.hasOwnProperty.call(e, u)) { var i = a ? Object.getOwnPropertyDescriptor(e, u) : null; i && (i.get || i.set) ? Object.defineProperty(n, u, i) : n[u] = e[u]; } return n.default = e, t && t.set(e, n), n; }
/* global window */

const messages = (0, _reactIntl.defineMessages)({
  label: {
    "id": "scrollTopButton.label",
    "defaultMessage": "Back to top"
  }
});
const scrollTop = () => {
  if (window.scrollTo) {
    window.scrollTo({
      left: 0,
      top: 0
    });
  }
};
class ScrollTopButton extends _react.Component {
  constructor() {
    super();
    this.handleScroll = this.handleScroll.bind(this);
    this.state = {
      visible: false
    };
  }
  componentDidMount() {
    window.addEventListener('scroll', this.handleScroll);
    this.setVisibility();
  }
  componentWillUnmount() {
    window.removeEventListener('scroll', this.handleScroll);
  }
  handleScroll() {
    this.setVisibility();
  }
  setVisibility() {
    const {
      visible
    } = this.state;
    const nextVisible = window.document.scrollingElement.scrollTop > 0;
    if (visible !== nextVisible) {
      this.setState({
        visible: nextVisible
      });
    }
  }
  render() {
    const {
      visible
    } = this.state;
    return /*#__PURE__*/_react.default.createElement(_IconButton.default, {
      className: visible ? _ScrollTopButton.default.common : _ScrollTopButton.default.hidden,
      labelMessage: messages.label,
      onClick: scrollTop
    });
  }
}
exports.default = ScrollTopButton;