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whippy-edition/app/javascript/mastodon/features/compose/components/character_counter.js

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import React from 'react';
import PropTypes from 'prop-types';
import { length } from 'stringz';
export default class CharacterCounter extends React.PureComponent {
static propTypes = {
text: PropTypes.string.isRequired,
max: PropTypes.number.isRequired,
};
checkRemainingText (diff) {
if (diff < 0) {
return <span className='character-counter character-counter--over'>{diff}</span>;
}
return <span className='character-counter'>{diff}</span>;
}
render () {
const diff = this.props.max - length(this.props.text);
return this.checkRemainingText(diff);
}
}