metamask-extension/ui/app/pages/send/send-content/send-gas-row/gas-fee-display/gas-fee-display.component.js

import React, { Component } from 'react';
import PropTypes from 'prop-types';
import UserPreferencedCurrencyDisplay from '../../../../../components/app/user-preferenced-currency-display';
import { PRIMARY, SECONDARY } from '../../../../../helpers/constants/common';

export default class GasFeeDisplay extends Component {
  static propTypes = {
    gasLoadingError: PropTypes.bool,
    gasTotal: PropTypes.string,
    onReset: PropTypes.func,
  };

  static contextTypes = {
    t: PropTypes.func,
  };

  render() {
    const { gasTotal, gasLoadingError, onReset } = this.props;

    return (
      <div className="send-v2__gas-fee-display">
        {/* eslint-disable-next-line no-nested-ternary */}
        {gasTotal ? (
          <div className="currency-display">
            <UserPreferencedCurrencyDisplay value={gasTotal} type={PRIMARY} />
            <UserPreferencedCurrencyDisplay
              className="currency-display__converted-value"
              value={gasTotal}
              type={SECONDARY}
            />
          </div>
        ) : gasLoadingError ? (
          <div className="currency-display.currency-display--message">
            {this.context.t('setGasPrice')}
          </div>
        ) : (
          <div className="currency-display">{this.context.t('loading')}</div>
        )}
        <button className="gas-fee-reset" onClick={onReset}>
          {this.context.t('reset')}
        </button>
      </div>
    );
  }
}