import React from 'react'; import PropTypes from 'prop-types'; import 'wicg-inert'; import { createBrowserHistory } from 'history'; import { multiply } from 'color-blend'; export default class ModalRoot extends React.PureComponent { static contextTypes = { router: PropTypes.object, }; static propTypes = { children: PropTypes.node, onClose: PropTypes.func.isRequired, backgroundColor: PropTypes.shape({ r: PropTypes.number, g: PropTypes.number, b: PropTypes.number, }), }; activeElement = this.props.children ? document.activeElement : null; handleKeyUp = (e) => { if ((e.key === 'Escape' || e.key === 'Esc' || e.keyCode === 27) && !!this.props.children) { this.props.onClose(); } } handleKeyDown = (e) => { if (e.key === 'Tab') { const focusable = Array.from(this.node.querySelectorAll('button:not([disabled]), [href], input:not([disabled]), select:not([disabled]), textarea:not([disabled]), [tabindex]:not([tabindex="-1"])')).filter((x) => window.getComputedStyle(x).display !== 'none'); const index = focusable.indexOf(e.target); let element; if (e.shiftKey) { element = focusable[index - 1] || focusable[focusable.length - 1]; } else { element = focusable[index + 1] || focusable[0]; } if (element) { element.focus(); e.stopPropagation(); e.preventDefault(); } } } componentDidMount () { window.addEventListener('keyup', this.handleKeyUp, false); window.addEventListener('keydown', this.handleKeyDown, false); this.history = this.context.router ? this.context.router.history : createBrowserHistory(); } componentWillReceiveProps (nextProps) { if (!!nextProps.children && !this.props.children) { this.activeElement = document.activeElement; this.getSiblings().forEach(sibling => sibling.setAttribute('inert', true)); } } componentDidUpdate (prevProps) { if (!this.props.children && !!prevProps.children) { this.getSiblings().forEach(sibling => sibling.removeAttribute('inert')); // Because of the wicg-inert polyfill, the activeElement may not be // immediately selectable, we have to wait for observers to run, as // described in https://github.com/WICG/inert#performance-and-gotchas Promise.resolve().then(() => { this.activeElement.focus({ preventScroll: true }); this.activeElement = null; }).catch(console.error); this._handleModalClose(); } if (this.props.children && !prevProps.children) { this._handleModalOpen(); } if (this.props.children) { this._ensureHistoryBuffer(); } } componentWillUnmount () { window.removeEventListener('keyup', this.handleKeyUp); window.removeEventListener('keydown', this.handleKeyDown); } _handleModalOpen () { this._modalHistoryKey = Date.now(); this.unlistenHistory = this.history.listen((_, action) => { if (action === 'POP') { this.props.onClose(); } }); } _handleModalClose () { if (this.unlistenHistory) { this.unlistenHistory(); } const { state } = this.history.location; if (state && state.mastodonModalKey === this._modalHistoryKey) { this.history.goBack(); } } _ensureHistoryBuffer () { const { pathname, state } = this.history.location; if (!state || state.mastodonModalKey !== this._modalHistoryKey) { this.history.push(pathname, { ...state, mastodonModalKey: this._modalHistoryKey }); } } getSiblings = () => { return Array(...this.node.parentElement.childNodes).filter(node => node !== this.node); } setRef = ref => { this.node = ref; } render () { const { children, onClose } = this.props; const visible = !!children; if (!visible) { return (
); } let backgroundColor = null; if (this.props.backgroundColor) { backgroundColor = multiply({ ...this.props.backgroundColor, a: 1 }, { r: 0, g: 0, b: 0, a: 0.7 }); } return (
{children}
); } }