mastodon/app/assets/javascripts/components/components/column_back_button.jsx

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React
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import { FormattedMessage } from 'react-intl';
import PropTypes from 'prop-types';
const iconStyle = {
display: 'inline-block',
marginRight: '5px'
};
class ColumnBackButton extends React.PureComponent {
constructor (props, context) {
super(props, context);
this.handleClick = this.handleClick.bind(this);
}
handleClick () {
if (window.history && window.history.length === 1) this.context.router.push("/");
else this.context.router.goBack();
}
render () {
return (
<div role='button' tabIndex='0' onClick={this.handleClick} className='column-back-button'>
<i className='fa fa-fw fa-chevron-left' style={iconStyle} />
<FormattedMessage id='column_back_button.label' defaultMessage='Back' />
</div>
);
}
};
ColumnBackButton.contextTypes = {
router: PropTypes.object
};
export default ColumnBackButton;