117 lines
3.3 KiB
JavaScript
117 lines
3.3 KiB
JavaScript
import React from 'react';
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import PropTypes from 'prop-types';
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import 'wicg-inert';
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export default class ModalRoot extends React.PureComponent {
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static propTypes = {
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children: PropTypes.node,
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onClose: PropTypes.func.isRequired,
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};
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state = {
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revealed: !!this.props.children,
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};
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activeElement = this.state.revealed ? document.activeElement : null;
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handleKeyUp = (e) => {
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if ((e.key === 'Escape' || e.key === 'Esc' || e.keyCode === 27)
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&& !!this.props.children) {
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this.props.onClose();
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}
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}
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handleKeyDown = (e) => {
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if (e.key === 'Tab') {
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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');
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const index = focusable.indexOf(e.target);
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let element;
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if (e.shiftKey) {
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element = focusable[index - 1] || focusable[focusable.length - 1];
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} else {
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element = focusable[index + 1] || focusable[0];
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}
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if (element) {
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element.focus();
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e.stopPropagation();
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e.preventDefault();
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}
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}
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}
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componentDidMount () {
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window.addEventListener('keyup', this.handleKeyUp, false);
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window.addEventListener('keydown', this.handleKeyDown, false);
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}
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componentWillReceiveProps (nextProps) {
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if (!!nextProps.children && !this.props.children) {
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this.activeElement = document.activeElement;
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this.getSiblings().forEach(sibling => sibling.setAttribute('inert', true));
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} else if (!nextProps.children) {
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this.setState({ revealed: false });
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}
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}
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componentDidUpdate (prevProps) {
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if (!this.props.children && !!prevProps.children) {
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this.getSiblings().forEach(sibling => sibling.removeAttribute('inert'));
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// Because of the wicg-inert polyfill, the activeElement may not be
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// immediately selectable, we have to wait for observers to run, as
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// described in https://github.com/WICG/inert#performance-and-gotchas
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Promise.resolve().then(() => {
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this.activeElement.focus();
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this.activeElement = null;
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}).catch((error) => {
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console.error(error);
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});
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}
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if (this.props.children) {
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requestAnimationFrame(() => {
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this.setState({ revealed: true });
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});
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}
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}
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componentWillUnmount () {
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window.removeEventListener('keyup', this.handleKeyUp);
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window.removeEventListener('keydown', this.handleKeyDown);
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}
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getSiblings = () => {
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return Array(...this.node.parentElement.childNodes).filter(node => node !== this.node);
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}
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setRef = ref => {
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this.node = ref;
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}
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render () {
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const { children, onClose } = this.props;
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const { revealed } = this.state;
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const visible = !!children;
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if (!visible) {
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return (
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<div className='modal-root' ref={this.setRef} style={{ opacity: 0 }} />
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);
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}
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return (
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<div className='modal-root' ref={this.setRef} style={{ opacity: revealed ? 1 : 0 }}>
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<div style={{ pointerEvents: visible ? 'auto' : 'none' }}>
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<div role='presentation' className='modal-root__overlay' onClick={onClose} />
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<div role='dialog' className='modal-root__container'>{children}</div>
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</div>
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</div>
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);
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}
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}
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