import React from 'react'; import { FormattedMessage } from 'react-intl'; import PropTypes from 'prop-types'; import Icon from 'flavours/glitch/components/icon'; import { createPortal } from 'react-dom'; export default class ColumnBackButton extends React.PureComponent { static contextTypes = { router: PropTypes.object, }; static propTypes = { multiColumn: PropTypes.bool, }; handleClick = (event) => { // if history is exhausted, or we would leave mastodon, just go to root. if (window.history.state) { const state = this.context.router.history.location.state; if (event.shiftKey && state && state.mastodonBackSteps) { this.context.router.history.go(-state.mastodonBackSteps); } else { this.context.router.history.goBack(); } } else { this.context.router.history.push('/'); } } render () { const { multiColumn } = this.props; const component = ( <button onClick={this.handleClick} className='column-back-button'> <Icon id='chevron-left' className='column-back-button__icon' fixedWidth /> <FormattedMessage id='column_back_button.label' defaultMessage='Back' /> </button> ); if (multiColumn) { return component; } else { // The portal container and the component may be rendered to the DOM in // the same React render pass, so the container might not be available at // the time `render()` is called. const container = document.getElementById('tabs-bar__portal'); if (container === null) { // The container wasn't available, force a re-render so that the // component can eventually be inserted in the container and not scroll // with the rest of the area. this.forceUpdate(); return component; } else { return createPortal(component, container); } } } }