2023-05-23 04:52:27 -04:00
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import { PureComponent } from 'react';
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2018-03-24 07:52:26 -04:00
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import PropTypes from 'prop-types';
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2019-11-04 07:03:44 -05:00
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import 'wicg-inert';
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import { createBrowserHistory } from 'history';
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2020-12-06 20:32:27 -05:00
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import { multiply } from 'color-blend';
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2018-03-24 07:52:26 -04:00
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2023-05-23 04:52:27 -04:00
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export default class ModalRoot extends PureComponent {
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static contextTypes = {
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router: PropTypes.object,
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};
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2018-03-24 07:52:26 -04:00
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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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backgroundColor: PropTypes.shape({
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r: PropTypes.number,
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g: PropTypes.number,
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b: PropTypes.number,
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}),
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ignoreFocus: PropTypes.bool,
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};
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activeElement = this.props.children ? 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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this.history = this.context.router ? this.context.router.history : createBrowserHistory();
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}
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UNSAFE_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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}
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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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if (!this.props.ignoreFocus) {
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this.activeElement.focus({ preventScroll: true });
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}
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this.activeElement = null;
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}).catch(console.error);
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this._handleModalClose();
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}
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if (this.props.children && !prevProps.children) {
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this._handleModalOpen();
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}
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if (this.props.children) {
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this._ensureHistoryBuffer();
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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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_handleModalOpen () {
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this._modalHistoryKey = Date.now();
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this.unlistenHistory = this.history.listen((_, action) => {
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if (action === 'POP') {
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this.props.onClose();
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}
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});
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}
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_handleModalClose () {
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if (this.unlistenHistory) {
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this.unlistenHistory();
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}
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const { state } = this.history.location;
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if (state && state.mastodonModalKey === this._modalHistoryKey) {
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this.history.goBack();
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}
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}
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_ensureHistoryBuffer () {
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const { pathname, state } = this.history.location;
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if (!state || state.mastodonModalKey !== this._modalHistoryKey) {
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this.history.push(pathname, { ...state, mastodonModalKey: this._modalHistoryKey });
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}
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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 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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let backgroundColor = null;
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if (this.props.backgroundColor) {
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backgroundColor = multiply({ ...this.props.backgroundColor, a: 1 }, { r: 0, g: 0, b: 0, a: 0.7 });
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}
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return (
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<div className='modal-root' ref={this.setRef}>
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<div style={{ pointerEvents: visible ? 'auto' : 'none' }}>
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<div role='presentation' className='modal-root__overlay' onClick={onClose} style={{ backgroundColor: backgroundColor ? `rgba(${backgroundColor.r}, ${backgroundColor.g}, ${backgroundColor.b}, 0.7)` : null }} />
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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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