metamask-extension/ui/app/components/fiat-value.js

const Component = require('react').Component
const h = require('react-hyperscript')
const inherits = require('util').inherits
const formatBalance = require('../util').formatBalance

module.exports = FiatValue

inherits(FiatValue, Component)
function FiatValue () {
  Component.call(this)
}

FiatValue.prototype.render = function () {
  const props = this.props
  const { conversionRate, currentCurrency, style } = props
  const renderedCurrency = currentCurrency || ''

  const value = formatBalance(props.value, 6)

  if (value === 'None') return value
  var fiatDisplayNumber, fiatTooltipNumber
  var splitBalance = value.split(' ')

  if (conversionRate !== 0) {
    fiatTooltipNumber = Number(splitBalance[0]) * conversionRate
    fiatDisplayNumber = fiatTooltipNumber.toFixed(2)
  } else {
    fiatDisplayNumber = 'N/A'
    fiatTooltipNumber = 'Unknown'
  }

  return fiatDisplay(fiatDisplayNumber, renderedCurrency.toUpperCase(), style)
}

function fiatDisplay (fiatDisplayNumber, fiatSuffix, styleOveride = {}) {
  const { fontSize, color, fontFamily, lineHeight } = styleOveride

  if (fiatDisplayNumber !== 'N/A') {
    return h('.flex-row', {
      style: {
        alignItems: 'flex-end',
        lineHeight: lineHeight || '13px',
        fontFamily: fontFamily || 'Montserrat Light',
        textRendering: 'geometricPrecision',
      },
    }, [
      h('div', {
        style: {
          width: '100%',
          textAlign: 'right',
          fontSize: fontSize || '12px',
          color: color || '#333333',
        },
      }, fiatDisplayNumber),
      h('div', {
        style: {
          color: color || '#AEAEAE',
          marginLeft: '5px',
          fontSize: fontSize || '12px',
        },
      }, fiatSuffix),
    ])
  } else {
    return h('div')
  }
}