Boostnote/browser/main/Detail/FromUrlButton.js

import PropTypes from 'prop-types'
import React from 'react'
import CSSModules from 'browser/lib/CSSModules'
import styles from './FromUrlButton.styl'
import _ from 'lodash'
import i18n from 'browser/lib/i18n'

class FromUrlButton extends React.Component {
  constructor (props) {
    super(props)

    this.state = {
      isActive: false
    }
  }

  handleMouseDown (e) {
    this.setState({
      isActive: true
    })
  }

  handleMouseUp (e) {
    this.setState({
      isActive: false
    })
  }

  handleMouseLeave (e) {
    this.setState({
      isActive: false
    })
  }

  render () {
    const { className } = this.props

    return (
      <button className={_.isString(className)
          ? 'FromUrlButton ' + className
          : 'FromUrlButton'
        }
        styleName={this.state.isActive || this.props.isActive
          ? 'root--active'
          : 'root'
        }
        onMouseDown={(e) => this.handleMouseDown(e)}
        onMouseUp={(e) => this.handleMouseUp(e)}
        onMouseLeave={(e) => this.handleMouseLeave(e)}
        onClick={this.props.onClick}>
        <img styleName='icon'
          src={this.state.isActive || this.props.isActive
            ? '../resources/icon/icon-external.svg'
            : '../resources/icon/icon-external.svg'
          }
        />
        <span styleName='tooltip'>{i18n.__('Convert URL to Markdown')}</span>
      </button>
    )
  }
}

FromUrlButton.propTypes = {
  isActive: PropTypes.bool,
  onClick: PropTypes.func,
  className: PropTypes.string
}

export default CSSModules(FromUrlButton, styles)