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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,
}),
ignoreFocus: PropTypes.bool,
};
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(() => {
if (!this.props.ignoreFocus) {
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 (
<div className='modal-root' ref={this.setRef} style={{ opacity: 0 }} />
);
}
let backgroundColor = null;
if (this.props.backgroundColor) {
backgroundColor = multiply({ ...this.props.backgroundColor, a: 1 }, { r: 0, g: 0, b: 0, a: 0.7 });
}
return (
<div className='modal-root' ref={this.setRef}>
<div style={{ pointerEvents: visible ? 'auto' : 'none' }}>
<div role='presentation' className='modal-root__overlay' onClick={onClose} style={{ backgroundColor: backgroundColor ? `rgba(${backgroundColor.r}, ${backgroundColor.g}, ${backgroundColor.b}, 0.7)` : null }} />
<div role='dialog' className='modal-root__container'>{children}</div>
</div>
</div>
);
}
}
|
