132 lines
2.9 KiB
JavaScript
132 lines
2.9 KiB
JavaScript
import React from 'react';
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import PropTypes from 'prop-types';
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import CaptionsService from './service';
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const CAPTIONS_CONFIG = Meteor.settings.public.captions;
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class Captions extends React.Component {
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constructor(props) {
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super(props);
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this.state = { initial: true };
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this.text = '';
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this.ariaText = '';
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this.timer = null;
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this.settings = CaptionsService.getCaptionsSettings();
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this.updateText = this.updateText.bind(this);
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this.resetTimer = this.resetTimer.bind(this);
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}
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componentDidMount() {
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this.setState({ initial: false });
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}
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shouldComponentUpdate(nextProps, nextState) {
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const {
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padId,
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revs,
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} = this.props;
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if (padId === nextProps.padId) {
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if (this.text !== '') this.ariaText = this.text;
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if (revs === nextProps.revs && !nextState.clear) return false;
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}
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return true;
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}
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componentDidUpdate() {
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/* https://reactjs.org/docs/react-component.html#componentdidupdate
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You may call setState() immediately in componentDidUpdate()
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but note that it must be wrapped in a condition (...),
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or you’ll cause an infinite loop. */
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const { clear } = this.state;
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if (clear) {
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this.setState({ clear: false });
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} else {
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this.resetTimer();
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this.timer = setTimeout(() => { this.setState({ clear: true }); }, CAPTIONS_CONFIG.time);
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}
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}
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componentWillUnmount() {
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this.resetTimer();
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}
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updateText(data) {
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const { clear } = this.state;
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if (clear) {
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this.text = '';
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} else {
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const text = this.text + data;
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this.text = CaptionsService.formatCaptionsText(text);
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}
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}
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resetTimer() {
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if (this.timer) {
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clearTimeout(this.timer);
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this.timer = null;
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}
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}
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render() {
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const { data } = this.props;
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const { initial } = this.state;
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const {
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fontFamily,
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fontSize,
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fontColor,
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backgroundColor,
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} = this.settings;
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if (!initial) {
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this.updateText(data);
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}
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const captionStyles = {
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whiteSpace: 'pre-wrap',
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wordWrap: 'break-word',
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fontFamily,
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fontSize,
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background: backgroundColor,
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color: fontColor,
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};
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const visuallyHidden = {
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position: 'absolute',
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overflow: 'hidden',
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clip: 'rect(0 0 0 0)',
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height: '1px',
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width: '1px',
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margin: '-1px',
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padding: '0',
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border: '0',
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};
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return (
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<div>
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<div
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aria-hidden
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style={captionStyles}
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>
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{this.text}
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</div>
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<div
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style={visuallyHidden}
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aria-live={this.text === '' && this.ariaText !== '' ? 'polite' : 'off'}
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>
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{this.ariaText}
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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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export default Captions;
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Captions.propTypes = {
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padId: PropTypes.string.isRequired,
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revs: PropTypes.number.isRequired,
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data: PropTypes.string.isRequired,
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};
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