Adds toggle for primary currency (#5421)

* Add UnitInput component

* Add CurrencyInput component

* Add UserPreferencedCurrencyInput component

* Add UserPreferencedCurrencyDisplay component

* Add updatePreferences action

* Add styles for CurrencyInput, CurrencyDisplay, and UnitInput

* Update SettingsTab page with Primary Currency toggle

* Refactor currency displays and inputs to use UserPreferenced displays and inputs

* Add TokenInput component

* Add UserPreferencedTokenInput component

* Use TokenInput in the send screen

* Fix unit tests

* Fix e2e and integration tests

* Remove send/CurrencyDisplay component

* Replace diamond unicode character with Eth logo. Fix typos

app/_locales/en/messages.json

@@ -361,6 +361,9 @@
   "enterPasswordContinue": {
     "message": "Enter password to continue"
   },
+  "eth": {
+    "message": "ETH"
+  },
   "etherscanView": {
     "message": "View account on Etherscan"
   },
@@ -380,7 +383,7 @@
     "message": "Failed"
   },
   "fiat": {
-    "message": "FIAT",
+    "message": "Fiat",
     "description": "Exchange type"
   },
   "fileImportFail": {
@@ -790,6 +793,12 @@
   "prev": {
     "message": "Prev"
   },
+  "primaryCurrencySetting": {
+    "message": "Primary Currency"
+  },
+  "primaryCurrencySettingDescription": {
+    "message": "Select ETH to prioritize displaying values in ETH. Select Fiat to prioritize displaying values in your selected currency."
+  },
   "privacyMsg": {
     "message": "Privacy Policy"
   },

app/images/eth.svg

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Generator: Adobe Illustrator 22.1.0, SVG Export Plug-In . SVG Version: 6.00 Build 0)  -->
+<svg version="1.1" id="Layer_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
+	 viewBox="0 0 40 40" style="enable-background:new 0 0 40 40;" xml:space="preserve">
+<style type="text/css">
+	.st0{fill:#38393A;}
+</style>
+<title>deposit-eth</title>
+<desc>Created with Sketch.</desc>
+<g id="deposit-eth" transform="translate(0.000000, 14.000000)">
+	<path id="Shape" class="st0" d="M19.9,16L7.5,8.7L19.9,26L32.3,8.7L19.9,16L19.9,16z M20.1-14L7.7,6.4l12.4,7.3l12.4-7.2L20.1-14z"
+		/>
+</g>
+</svg>

app/scripts/controllers/preferences.js

@@ -38,6 +38,9 @@ class PreferencesController {
       lostIdentities: {},
       seedWords: null,
       forgottenPassword: false,
+      preferences: {
+        useETHAsPrimaryCurrency: true,
+      },
     }, opts.initState)
 
     this.diagnostics = opts.diagnostics
@@ -463,6 +466,33 @@ class PreferencesController {
   getFeatureFlags () {
     return this.store.getState().featureFlags
   }
+
+  /**
+   * Updates the `preferences` property, which is an object. These are user-controlled features
+   * found in the settings page.
+   * @param {string} preference The preference to enable or disable.
+   * @param {boolean} value Indicates whether or not the preference should be enabled or disabled.
+   * @returns {Promise<object>} Promises a new object; the updated preferences object.
+   */
+  setPreference (preference, value) {
+    const currentPreferences = this.getPreferences()
+    const updatedPreferences = {
+      ...currentPreferences,
+      [preference]: value,
+    }
+
+    this.store.updateState({ preferences: updatedPreferences })
+    return Promise.resolve(updatedPreferences)
+  }
+
+  /**
+   * A getter for the `preferences` property
+   * @returns {object} A key-boolean map of user-selected preferences.
+   */
+  getPreferences () {
+    return this.store.getState().preferences
+  }
+
   //
   // PRIVATE METHODS
   //

app/scripts/metamask-controller.js

@@ -387,6 +387,7 @@ module.exports = class MetamaskController extends EventEmitter {
       setCurrentAccountTab: nodeify(preferencesController.setCurrentAccountTab, preferencesController),
       setAccountLabel: nodeify(preferencesController.setAccountLabel, preferencesController),
       setFeatureFlag: nodeify(preferencesController.setFeatureFlag, preferencesController),
+      setPreference: nodeify(preferencesController.setPreference, preferencesController),
 
       // BlacklistController
       whitelistPhishingDomain: this.whitelistPhishingDomain.bind(this),

development/states/add-token.json

@@ -107,7 +107,10 @@
       "maxModeOn": false,
       "editingTransactionId": null
     },
-    "currentLocale": "en"
+    "currentLocale": "en",
+    "preferences": {
+      "useETHAsPrimaryCurrency": true
+    }
   },
   "appState": {
     "menuOpen": false,

development/states/confirm-sig-requests.json

@@ -150,7 +150,10 @@
       "maxModeOn": false,
       "editingTransactionId": null
     },
-    "currentLocale": "en"
+    "currentLocale": "en",
+    "preferences": {
+      "useETHAsPrimaryCurrency": true
+    }
   },
   "appState": {
     "menuOpen": false,

development/states/currency-localization.json

@@ -108,7 +108,10 @@
       "maxModeOn": false,
       "editingTransactionId": null
     },
-    "currentLocale": "en"
+    "currentLocale": "en",
+    "preferences": {
+      "useETHAsPrimaryCurrency": true
+    }
   },
   "appState": {
     "menuOpen": false,

development/states/first-time.json

@@ -37,7 +37,10 @@
     "shapeShiftTxList": [],
     "lostAccounts": [],
     "tokens": [],
-    "currentLocale": "en"
+    "currentLocale": "en",
+    "preferences": {
+      "useETHAsPrimaryCurrency": true
+    }
   },
   "appState": {
     "menuOpen": false,

development/states/send-new-ui.json

@@ -109,7 +109,10 @@
       "maxModeOn": false,
       "editingTransactionId": null
     },
-    "currentLocale": "en"
+    "currentLocale": "en",
+    "preferences": {
+      "useETHAsPrimaryCurrency": true
+    }
   },
   "appState": {
     "menuOpen": false,

development/states/tx-list-items.json

@@ -102,7 +102,10 @@
     "shapeShiftTxList": [{"depositAddress":"34vJ3AfmNcLiziA4VFgEVcQTwxVLD1qkke","depositType":"BTC","key":"shapeshift","response":{"status":"no_deposits","address":"34vJ3AfmNcLiziA4VFgEVcQTwxVLD1qkke"},"time":1522377459106}],
     "lostAccounts": [],
     "send": {},
-    "currentLocale": "en"
+    "currentLocale": "en",
+    "preferences": {
+      "useETHAsPrimaryCurrency": true
+    }
   },
   "appState": {
     "menuOpen": false,

test/e2e/beta/from-import-beta-ui.spec.js

@@ -286,7 +286,7 @@ describe('Using MetaMask with an existing account', function () {
       await delay(regularDelayMs)
 
       const inputAddress = await findElement(driver, By.css('input[placeholder="Recipient Address"]'))
-      const inputAmount = await findElement(driver, By.css('.currency-display__input'))
+      const inputAmount = await findElement(driver, By.css('.unit-input__input'))
       await inputAddress.sendKeys('0x2f318C334780961FB129D2a6c30D0763d9a5C970')
       await inputAmount.sendKeys('1')
 

test/e2e/beta/metamask-beta-ui.spec.js

@@ -383,7 +383,7 @@ describe('MetaMask', function () {
       await delay(regularDelayMs)
 
       const inputAddress = await findElement(driver, By.css('input[placeholder="Recipient Address"]'))
-      const inputAmount = await findElement(driver, By.css('.currency-display__input'))
+      const inputAmount = await findElement(driver, By.css('.unit-input__input'))
       await inputAddress.sendKeys('0x2f318C334780961FB129D2a6c30D0763d9a5C970')
       await inputAmount.sendKeys('1')
 
@@ -702,7 +702,7 @@ describe('MetaMask', function () {
       await delay(regularDelayMs)
 
       const inputAddress = await findElement(driver, By.css('input[placeholder="Recipient Address"]'))
-      const inputAmount = await findElement(driver, By.css('.currency-display__input'))
+      const inputAmount = await findElement(driver, By.css('.unit-input__input'))
       await inputAddress.sendKeys('0x2f318C334780961FB129D2a6c30D0763d9a5C970')
       await inputAmount.sendKeys('50')
 
@@ -834,8 +834,8 @@ describe('MetaMask', function () {
       await save.click()
       await driver.wait(until.stalenessOf(gasModal))
 
-      const gasFeeInputs = await findElements(driver, By.css('.confirm-detail-row__eth'))
+      const gasFeeInputs = await findElements(driver, By.css('.confirm-detail-row__primary'))
-      assert.equal(await gasFeeInputs[0].getText(), '♦ 0.0006')
+      assert.equal(await gasFeeInputs[0].getText(), '0.0006')
     })
 
     it('submits the transaction', async function () {
@@ -957,8 +957,8 @@ describe('MetaMask', function () {
       await save.click()
       await driver.wait(until.stalenessOf(gasModal))
 
-      const gasFeeInputs = await findElements(driver, By.css('.confirm-detail-row__eth'))
+      const gasFeeInputs = await findElements(driver, By.css('.confirm-detail-row__primary'))
-      assert.equal(await gasFeeInputs[0].getText(), '♦ 0.0006')
+      assert.equal(await gasFeeInputs[0].getText(), '0.0006')
     })
 
     it('submits the transaction', async function () {

test/integration/lib/send-new-ui.js

@@ -40,7 +40,7 @@ async function customizeGas (assert, price, limit, ethFee, usdFee) {
   const sendGasField = await queryAsync($, '.send-v2__gas-fee-display')
 
   assert.equal(
-    (await findAsync(sendGasField, '.currency-display__input-wrapper > input')).val(),
+    (await findAsync(sendGasField, '.currency-display-component'))[0].textContent,
     ethFee,
     'send gas field should show customized gas total'
   )
@@ -97,9 +97,9 @@ async function runSendFlowTest (assert, done) {
   assert.equal(sendToAccountAddress, '0x2f8D4a878cFA04A6E60D46362f5644DeAb66572D', 'send to dropdown selects the correct address')
 
   const sendAmountField = await queryAsync($, '.send-v2__form-row:eq(2)')
-  sendAmountField.find('.currency-display')[0].click()
+  sendAmountField.find('.unit-input')[0].click()
 
-  const sendAmountFieldInput = await findAsync(sendAmountField, '.currency-display__input')
+  const sendAmountFieldInput = await findAsync(sendAmountField, '.unit-input__input')
   sendAmountFieldInput.val('5.1')
   reactTriggerChange(sendAmountField.find('input')[0])
 
@@ -112,9 +112,9 @@ async function runSendFlowTest (assert, done) {
   errorMessage = $('.send-v2__error')
   assert.equal(errorMessage.length, 0, 'send should stop rendering amount error message after amount is corrected')
 
-  await customizeGas(assert, 0, 21000, '0', '$0.00 USD')
+  await customizeGas(assert, 0, 21000, '0 ETH', '$0.00 USD')
-  await customizeGas(assert, 1, 21000, '0.000021', '$0.03 USD')
+  await customizeGas(assert, 1, 21000, '0.000021 ETH', '$0.03 USD')
-  await customizeGas(assert, 500, 60000, '0.03', '$36.03 USD')
+  await customizeGas(assert, 500, 60000, '0.03 ETH', '$36.03 USD')
 
   const sendButton = await queryAsync($, 'button.btn-primary.btn--large.page-container__footer-button')
   assert.equal(sendButton[0].textContent, 'Next', 'next button rendered')
@@ -130,11 +130,11 @@ async function runSendFlowTest (assert, done) {
   const confirmToName = (await queryAsync($, '.sender-to-recipient__name')).last()
   assert.equal(confirmToName[0].textContent, 'Send Account 3', 'confirm screen should show correct to name')
 
-  const confirmScreenRowFiats = await queryAsync($, '.confirm-detail-row__fiat')
+  const confirmScreenRowFiats = await queryAsync($, '.confirm-detail-row__secondary')
   const confirmScreenGas = confirmScreenRowFiats[0]
   assert.equal(confirmScreenGas.textContent, '$3.60', 'confirm screen should show correct gas')
   const confirmScreenTotal = confirmScreenRowFiats[1]
-  assert.equal(confirmScreenTotal.textContent, '$2,405.36', 'confirm screen should show correct total')
+  assert.equal(confirmScreenTotal.textContent, '$2,405.37', 'confirm screen should show correct total')
 
   const confirmScreenBackButton = await queryAsync($, '.confirm-page-container-header__back-button')
   confirmScreenBackButton[0].click()
@@ -150,9 +150,9 @@ async function runSendFlowTest (assert, done) {
   sendToFieldInputInEdit.val('0xd85a4b6a394794842887b8284293d69163007bbb')
 
   const sendAmountFieldInEdit = await queryAsync($, '.send-v2__form-row:eq(2)')
-  sendAmountFieldInEdit.find('.currency-display')[0].click()
+  sendAmountFieldInEdit.find('.unit-input')[0].click()
 
-  const sendAmountFieldInputInEdit = sendAmountFieldInEdit.find('.currency-display__input')
+  const sendAmountFieldInputInEdit = sendAmountFieldInEdit.find('.unit-input__input')
   sendAmountFieldInputInEdit.val('1.0')
   reactTriggerChange(sendAmountFieldInputInEdit[0])
 

test/unit/components/balance-component-test.js

@@ -1,44 +0,0 @@
-const assert = require('assert')
-const h = require('react-hyperscript')
-const { createMockStore } = require('redux-test-utils')
-const { shallowWithStore } = require('../../lib/render-helpers')
-const BalanceComponent = require('../../../ui/app/components/balance-component')
-const mockState = {
-  metamask: {
-    accounts: { abc: {} },
-    network: 1,
-    selectedAddress: 'abc',
-  },
-}
-
-describe('BalanceComponent', function () {
-  let balanceComponent
-  let store
-  let component
-  beforeEach(function () {
-    store = createMockStore(mockState)
-    component = shallowWithStore(h(BalanceComponent), store)
-    balanceComponent = component.dive()
-  })
-
-  it('shows token balance and convert to fiat value based on conversion rate', function () {
-    const formattedBalance = '1.23 ETH'
-
-    const tokenBalance = balanceComponent.instance().getTokenBalance(formattedBalance, false)
-    const fiatDisplayNumber = balanceComponent.instance().getFiatDisplayNumber(formattedBalance, 2)
-
-    assert.equal('1.23 ETH', tokenBalance)
-    assert.equal(2.46, fiatDisplayNumber)
-  })
-
-  it('shows only the token balance when conversion rate is not available', function () {
-    const formattedBalance = '1.23 ETH'
-
-    const tokenBalance = balanceComponent.instance().getTokenBalance(formattedBalance, false)
-    const fiatDisplayNumber = balanceComponent.instance().getFiatDisplayNumber(formattedBalance, 0)
-
-    assert.equal('1.23 ETH', tokenBalance)
-    assert.equal('N/A', fiatDisplayNumber)
-  })
-
-})

ui/app/actions.js

@@ -305,6 +305,12 @@ var actions = {
   updateFeatureFlags,
   UPDATE_FEATURE_FLAGS: 'UPDATE_FEATURE_FLAGS',
 
+  // Preferences
+  setPreference,
+  updatePreferences,
+  UPDATE_PREFERENCES: 'UPDATE_PREFERENCES',
+  setUseETHAsPrimaryCurrencyPreference,
+
   setMouseUserState,
   SET_MOUSE_USER_STATE: 'SET_MOUSE_USER_STATE',
 
@@ -2298,6 +2304,36 @@ function updateFeatureFlags (updatedFeatureFlags) {
   }
 }
 
+function setPreference (preference, value) {
+  return dispatch => {
+    dispatch(actions.showLoadingIndication())
+    return new Promise((resolve, reject) => {
+      background.setPreference(preference, value, (err, updatedPreferences) => {
+        dispatch(actions.hideLoadingIndication())
+
+        if (err) {
+          dispatch(actions.displayWarning(err.message))
+          return reject(err)
+        }
+
+        dispatch(actions.updatePreferences(updatedPreferences))
+        resolve(updatedPreferences)
+      })
+    })
+  }
+}
+
+function updatePreferences (value) {
+  return {
+    type: actions.UPDATE_PREFERENCES,
+    value,
+  }
+}
+
+function setUseETHAsPrimaryCurrencyPreference (value) {
+  return setPreference('useETHAsPrimaryCurrency', value)
+}
+
 function setNetworkNonce (networkNonce) {
   return {
     type: actions.SET_NETWORK_NONCE,

ui/app/components/account-menu/index.js

@@ -8,11 +8,11 @@ const h = require('react-hyperscript')
 const actions = require('../../actions')
 const { Menu, Item, Divider, CloseArea } = require('../dropdowns/components/menu')
 const Identicon = require('../identicon')
-const { formatBalance } = require('../../util')
 const { ENVIRONMENT_TYPE_POPUP } = require('../../../../app/scripts/lib/enums')
 const { getEnvironmentType } = require('../../../../app/scripts/lib/util')
 const Tooltip = require('../tooltip')
-
+import UserPreferencedCurrencyDisplay from '../user-preferenced-currency-display'
+import { PRIMARY } from '../../constants/common'
 
 const {
   SETTINGS_ROUTE,
@@ -163,7 +163,6 @@ AccountMenu.prototype.renderAccounts = function () {
     const isSelected = identity.address === selectedAddress
 
     const balanceValue = accounts[address] ? accounts[address].balance : ''
-    const formattedBalance = balanceValue ? formatBalance(balanceValue, 6) : '...'
     const simpleAddress = identity.address.substring(2).toLowerCase()
 
     const keyring = keyrings.find((kr) => {
@@ -189,7 +188,11 @@ AccountMenu.prototype.renderAccounts = function () {
 
         h('div.account-menu__account-info', [
           h('div.account-menu__name', identity.name || ''),
-          h('div.account-menu__balance', formattedBalance),
+          h(UserPreferencedCurrencyDisplay, {
+            className: 'account-menu__balance',
+            value: balanceValue,
+            type: PRIMARY,
+          }),
         ]),
 
         this.renderKeyringType(keyring),

ui/app/components/balance-component.js

@@ -4,10 +4,11 @@ const h = require('react-hyperscript')
 const inherits = require('util').inherits
 const TokenBalance = require('./token-balance')
 const Identicon = require('./identicon')
-import CurrencyDisplay from './currency-display'
+import UserPreferencedCurrencyDisplay from './user-preferenced-currency-display'
+import { PRIMARY, SECONDARY } from '../constants/common'
 const { getAssetImages, conversionRateSelector, getCurrentCurrency} = require('../selectors')
 
-const { formatBalance, generateBalanceObject } = require('../util')
+const { formatBalance } = require('../util')
 
 module.exports = connect(mapStateToProps)(BalanceComponent)
 
@@ -65,7 +66,7 @@ BalanceComponent.prototype.renderTokenBalance = function () {
 
 BalanceComponent.prototype.renderBalance = function () {
   const props = this.props
-  const { shorten, account } = props
+  const { account } = props
   const balanceValue = account && account.balance
   const needsParse = 'needsParse' in props ? props.needsParse : true
   const formattedBalance = balanceValue ? formatBalance(balanceValue, 6, needsParse) : '...'
@@ -80,25 +81,20 @@ BalanceComponent.prototype.renderBalance = function () {
   }
 
   return h('div.flex-column.balance-display', {}, [
-    h('div.token-amount', {
+    h('div.token-amount', {}, h(UserPreferencedCurrencyDisplay, {
-      style: {},
+      value: balanceValue,
-    }, this.getTokenBalance(formattedBalance, shorten)),
+      type: PRIMARY,
+      ethNumberOfDecimals: 3,
+    })),
 
-    showFiat && h(CurrencyDisplay, {
+    showFiat && h(UserPreferencedCurrencyDisplay, {
       value: balanceValue,
+      type: SECONDARY,
+      ethNumberOfDecimals: 3,
     }),
   ])
 }
 
-BalanceComponent.prototype.getTokenBalance = function (formattedBalance, shorten) {
-  const balanceObj = generateBalanceObject(formattedBalance, shorten ? 1 : 3)
-
-  const balanceValue = shorten ? balanceObj.shortBalance : balanceObj.balance
-  const label = balanceObj.label
-
-  return `${balanceValue} ${label}`
-}
-
 BalanceComponent.prototype.getFiatDisplayNumber = function (formattedBalance, conversionRate) {
   if (formattedBalance === 'None') return formattedBalance
   if (conversionRate === 0) return 'N/A'

ui/app/components/confirm-page-container/confirm-detail-row/confirm-detail-row.component.js

@@ -1,16 +1,19 @@
 import React from 'react'
 import PropTypes from 'prop-types'
 import classnames from 'classnames'
+import UserPreferencedCurrencyDisplay from '../../user-preferenced-currency-display'
+import { PRIMARY, SECONDARY } from '../../../constants/common'
 
 const ConfirmDetailRow = props => {
   const {
     label,
-    fiatText,
+    primaryText,
-    ethText,
+    secondaryText,
     onHeaderClick,
-    fiatTextColor,
+    primaryValueTextColor,
     headerText,
     headerTextClassName,
+    value,
   } = props
 
   return (
@@ -25,28 +28,57 @@ const ConfirmDetailRow = props => {
         >
           { headerText }
         </div>
-        <div
+        {
-          className="confirm-detail-row__fiat"
+          primaryText
-          style={{ color: fiatTextColor }}
+            ? (
-        >
+              <div
-          { fiatText }
+                className="confirm-detail-row__primary"
-        </div>
+                style={{ color: primaryValueTextColor }}
-        <div className="confirm-detail-row__eth">
+              >
-          { ethText }
+                { primaryText }
-        </div>
+              </div>
+            ) : (
+              <UserPreferencedCurrencyDisplay
+                className="confirm-detail-row__primary"
+                type={PRIMARY}
+                value={value}
+                showEthLogo
+                ethLogoHeight="18"
+                style={{ color: primaryValueTextColor }}
+                hideLabel
+              />
+            )
+        }
+        {
+          secondaryText
+            ? (
+              <div className="confirm-detail-row__secondary">
+                { secondaryText }
+              </div>
+            ) : (
+              <UserPreferencedCurrencyDisplay
+                className="confirm-detail-row__secondary"
+                type={SECONDARY}
+                value={value}
+                showEthLogo
+                hideLabel
+              />
+            )
+        }
       </div>
     </div>
   )
 }
 
 ConfirmDetailRow.propTypes = {
-  label: PropTypes.string,
-  fiatText: PropTypes.string,
-  ethText: PropTypes.string,
-  fiatTextColor: PropTypes.string,
-  onHeaderClick: PropTypes.func,
   headerText: PropTypes.string,
   headerTextClassName: PropTypes.string,
+  label: PropTypes.string,
+  onHeaderClick: PropTypes.func,
+  primaryValueTextColor: PropTypes.string,
+  primaryText: PropTypes.oneOfType([PropTypes.string, PropTypes.node]),
+  secondaryText: PropTypes.string,
+  value: PropTypes.string,
 }
 
 export default ConfirmDetailRow

ui/app/components/confirm-page-container/confirm-detail-row/index.scss

@@ -18,18 +18,14 @@
     min-width: 0;
   }
 
-  &__fiat {
+  &__primary {
     font-size: 1.5rem;
-    white-space: nowrap;
+    justify-content: flex-end;
-    overflow: hidden;
-    text-overflow: ellipsis;
   }
 
-  &__eth {
+  &__secondary {
     color: $oslo-gray;
-    white-space: nowrap;
+    justify-content: flex-end;
-    overflow: hidden;
-    text-overflow: ellipsis;
   }
 
   &__header-text {

ui/app/components/confirm-page-container/confirm-detail-row/tests/confirm-detail-row.component.test.js

@@ -12,17 +12,19 @@ describe('Confirm Detail Row Component', function () {
   let wrapper
 
   beforeEach(() => {
-    wrapper = shallow(<ConfirmDetailRow
+    wrapper = shallow(
-      errorType={'mockErrorType'}
+      <ConfirmDetailRow
-      label={'mockLabel'}
+        errorType={'mockErrorType'}
-      showError={false}
+        label={'mockLabel'}
-      fiatText = {'mockFiatText'}
+        showError={false}
-      ethText = {'mockEthText'}
+        primaryText = {'mockFiatText'}
-      fiatTextColor= {'mockColor'}
+        secondaryText = {'mockEthText'}
-      onHeaderClick= {propsMethodSpies.onHeaderClick}
+        primaryValueTextColor= {'mockColor'}
-      headerText = {'mockHeaderText'}
+        onHeaderClick= {propsMethodSpies.onHeaderClick}
-      headerTextClassName = {'mockHeaderClass'}
+        headerText = {'mockHeaderText'}
-    />)
+        headerTextClassName = {'mockHeaderClass'}
+      />
+    )
   })
 
 	describe('render', () => {
@@ -38,16 +40,16 @@ describe('Confirm Detail Row Component', function () {
       assert.equal(wrapper.find('.confirm-detail-row__details > .confirm-detail-row__header-text').childAt(0).text(), 'mockHeaderText')
     })
 
-    it('should render the fiatText as a child of the confirm-detail-row__fiat', () => {
+    it('should render the primaryText as a child of the confirm-detail-row__primary', () => {
-      assert.equal(wrapper.find('.confirm-detail-row__details > .confirm-detail-row__fiat').childAt(0).text(), 'mockFiatText')
+      assert.equal(wrapper.find('.confirm-detail-row__details > .confirm-detail-row__primary').childAt(0).text(), 'mockFiatText')
     })
 
-    it('should render the ethText as a child of the confirm-detail-row__eth', () => {
+    it('should render the ethText as a child of the confirm-detail-row__secondary', () => {
-      assert.equal(wrapper.find('.confirm-detail-row__details > .confirm-detail-row__eth').childAt(0).text(), 'mockEthText')
+      assert.equal(wrapper.find('.confirm-detail-row__details > .confirm-detail-row__secondary').childAt(0).text(), 'mockEthText')
     })
 
-    it('should set the fiatTextColor on confirm-detail-row__fiat', () => {
+    it('should set the fiatTextColor on confirm-detail-row__primary', () => {
-      assert.equal(wrapper.find('.confirm-detail-row__fiat').props().style.color, 'mockColor')
+      assert.equal(wrapper.find('.confirm-detail-row__primary').props().style.color, 'mockColor')
     })
 
     it('should assure the confirm-detail-row__header-text classname is correct', () => {
@@ -58,7 +60,5 @@ describe('Confirm Detail Row Component', function () {
       wrapper.find('.confirm-detail-row__header-text').props().onClick()
       assert.equal(assert.equal(propsMethodSpies.onHeaderClick.callCount, 1))
     })
-
-
 	})
 })

ui/app/components/confirm-page-container/confirm-page-container-content/confirm-page-container-content.component.js

@@ -17,9 +17,10 @@ export default class ConfirmPageContainerContent extends Component {
     nonce: PropTypes.string,
     assetImage: PropTypes.string,
     subtitle: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
+    subtitleComponent: PropTypes.node,
     summaryComponent: PropTypes.node,
     title: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
-    titleComponent: PropTypes.func,
+    titleComponent: PropTypes.node,
     warning: PropTypes.string,
   }
 
@@ -54,7 +55,9 @@ export default class ConfirmPageContainerContent extends Component {
       errorKey,
       errorMessage,
       title,
+      titleComponent,
       subtitle,
+      subtitleComponent,
       hideSubtitle,
       identiconAddress,
       nonce,
@@ -80,7 +83,9 @@ export default class ConfirmPageContainerContent extends Component {
               })}
               action={action}
               title={title}
+              titleComponent={titleComponent}
               subtitle={subtitle}
+              subtitleComponent={subtitleComponent}
               hideSubtitle={hideSubtitle}
               identiconAddress={identiconAddress}
               nonce={nonce}

ui/app/components/confirm-page-container/confirm-page-container-content/confirm-page-container-summary/confirm-page-container-summary.component.js

@@ -4,7 +4,18 @@ import classnames from 'classnames'
 import Identicon from '../../../identicon'
 
 const ConfirmPageContainerSummary = props => {
-  const { action, title, subtitle, hideSubtitle, className, identiconAddress, nonce, assetImage } = props
+  const {
+    action,
+    title,
+    titleComponent,
+    subtitle,
+    subtitleComponent,
+    hideSubtitle,
+    className,
+    identiconAddress,
+    nonce,
+    assetImage,
+  } = props
 
   return (
     <div className={classnames('confirm-page-container-summary', className)}>
@@ -32,12 +43,12 @@ const ConfirmPageContainerSummary = props => {
           )
         }
         <div className="confirm-page-container-summary__title-text">
-          { title }
+          { titleComponent || title }
         </div>
       </div>
       {
         hideSubtitle || <div className="confirm-page-container-summary__subtitle">
-          { subtitle }
+          { subtitleComponent || subtitle }
         </div>
       }
     </div>
@@ -47,7 +58,9 @@ const ConfirmPageContainerSummary = props => {
 ConfirmPageContainerSummary.propTypes = {
   action: PropTypes.string,
   title: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
+  titleComponent: PropTypes.node,
   subtitle: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
+  subtitleComponent: PropTypes.node,
   hideSubtitle: PropTypes.bool,
   className: PropTypes.string,
   identiconAddress: PropTypes.string,

ui/app/components/confirm-page-container/confirm-page-container.component.js

@@ -16,8 +16,9 @@ export default class ConfirmPageContainer extends Component {
     onEdit: PropTypes.func,
     showEdit: PropTypes.bool,
     subtitle: PropTypes.string,
+    subtitleComponent: PropTypes.node,
     title: PropTypes.string,
-    titleComponent: PropTypes.func,
+    titleComponent: PropTypes.node,
     // Sender to Recipient
     fromAddress: PropTypes.string,
     fromName: PropTypes.string,
@@ -65,6 +66,7 @@ export default class ConfirmPageContainer extends Component {
       title,
       titleComponent,
       subtitle,
+      subtitleComponent,
       hideSubtitle,
       summaryComponent,
       detailsComponent,
@@ -101,6 +103,7 @@ export default class ConfirmPageContainer extends Component {
               title={title}
               titleComponent={titleComponent}
               subtitle={subtitle}
+              subtitleComponent={subtitleComponent}
               hideSubtitle={hideSubtitle}
               summaryComponent={summaryComponent}
               detailsComponent={detailsComponent}

ui/app/components/currency-display/currency-display.component.js

@@ -1,5 +1,6 @@
 import React, { PureComponent } from 'react'
 import PropTypes from 'prop-types'
+import classnames from 'classnames'
 import { ETH, GWEI } from '../../constants/common'
 
 export default class CurrencyDisplay extends PureComponent {
@@ -7,6 +8,8 @@ export default class CurrencyDisplay extends PureComponent {
     className: PropTypes.string,
     displayValue: PropTypes.string,
     prefix: PropTypes.string,
+    prefixComponent: PropTypes.node,
+    style: PropTypes.object,
     // Used in container
     currency: PropTypes.oneOf([ETH]),
     denomination: PropTypes.oneOf([GWEI]),
@@ -16,15 +19,17 @@ export default class CurrencyDisplay extends PureComponent {
   }
 
   render () {
-    const { className, displayValue, prefix } = this.props
+    const { className, displayValue, prefix, prefixComponent, style } = this.props
     const text = `${prefix || ''}${displayValue}`
 
     return (
       <div
-        className={className}
+        className={classnames('currency-display-component', className)}
+        style={style}
         title={text}
       >
-        { text }
+        { prefixComponent}
+        <span className="currency-display-component__text">{ text }</span>
       </div>
     )
   }

ui/app/components/currency-display/currency-display.container.js

@@ -2,10 +2,26 @@ import { connect } from 'react-redux'
 import CurrencyDisplay from './currency-display.component'
 import { getValueFromWeiHex, formatCurrency } from '../../helpers/confirm-transaction/util'
 
-const mapStateToProps = (state, ownProps) => {
+const mapStateToProps = state => {
-  const { value, numberOfDecimals = 2, currency, denomination, hideLabel } = ownProps
   const { metamask: { currentCurrency, conversionRate } } = state
 
+  return {
+    currentCurrency,
+    conversionRate,
+  }
+}
+
+const mergeProps = (stateProps, dispatchProps, ownProps) => {
+  const { currentCurrency, conversionRate, ...restStateProps } = stateProps
+  const {
+    value,
+    numberOfDecimals = 2,
+    currency,
+    denomination,
+    hideLabel,
+    ...restOwnProps
+  } = ownProps
+
   const toCurrency = currency || currentCurrency
   const convertedValue = getValueFromWeiHex({
     value, toCurrency, conversionRate, numberOfDecimals, toDenomination: denomination,
@@ -14,8 +30,11 @@ const mapStateToProps = (state, ownProps) => {
   const displayValue = hideLabel ? formattedValue : `${formattedValue} ${toCurrency.toUpperCase()}`
 
   return {
+    ...restStateProps,
+    ...dispatchProps,
+    ...restOwnProps,
     displayValue,
   }
 }
 
-export default connect(mapStateToProps)(CurrencyDisplay)
+export default connect(mapStateToProps, null, mergeProps)(CurrencyDisplay)

ui/app/components/currency-display/index.scss

@@ -0,0 +1,10 @@
+.currency-display-component {
+  display: flex;
+  align-items: center;
+
+  &__text {
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+  }
+}

ui/app/components/currency-display/tests/currency-display.container.test.js

@@ -1,12 +1,13 @@
 import assert from 'assert'
 import proxyquire from 'proxyquire'
 
-let mapStateToProps
+let mapStateToProps, mergeProps
 
 proxyquire('../currency-display.container.js', {
   'react-redux': {
-    connect: ms => {
+    connect: (ms, md, mp) => {
       mapStateToProps = ms
+      mergeProps = mp
       return () => ({})
     },
   },
@@ -22,6 +23,20 @@ describe('CurrencyDisplay container', () => {
         },
       }
 
+      assert.deepEqual(mapStateToProps(mockState), {
+        conversionRate: 280.45,
+        currentCurrency: 'usd',
+      })
+    })
+  })
+
+  describe('mergeProps()', () => {
+    it('should return the correct props', () => {
+      const mockStateProps = {
+        conversionRate: 280.45,
+        currentCurrency: 'usd',
+      }
+
       const tests = [
         {
           props: {
@@ -98,7 +113,7 @@ describe('CurrencyDisplay container', () => {
       ]
 
       tests.forEach(({ props, result }) => {
-        assert.deepEqual(mapStateToProps(mockState, props), result)
+        assert.deepEqual(mergeProps(mockStateProps, {}, { ...props }), result)
       })
     })
   })

ui/app/components/currency-input/currency-input.component.js

@@ -0,0 +1,120 @@
+import React, { PureComponent } from 'react'
+import PropTypes from 'prop-types'
+import UnitInput from '../unit-input'
+import CurrencyDisplay from '../currency-display'
+import { getValueFromWeiHex, getWeiHexFromDecimalValue } from '../../helpers/conversions.util'
+import { ETH } from '../../constants/common'
+
+/**
+ * Component that allows user to enter currency values as a number, and props receive a converted
+ * hex value in WEI. props.value, used as a default or forced value, should be a hex value, which
+ * gets converted into a decimal value depending on the currency (ETH or Fiat).
+ */
+export default class CurrencyInput extends PureComponent {
+  static propTypes = {
+    conversionRate: PropTypes.number,
+    currentCurrency: PropTypes.string,
+    onChange: PropTypes.func,
+    onBlur: PropTypes.func,
+    suffix: PropTypes.string,
+    useFiat: PropTypes.bool,
+    value: PropTypes.string,
+  }
+
+  constructor (props) {
+    super(props)
+
+    const { value: hexValue } = props
+    const decimalValue = hexValue ? this.getDecimalValue(props) : 0
+
+    this.state = {
+      decimalValue,
+      hexValue,
+    }
+  }
+
+  componentDidUpdate (prevProps) {
+    const { value: prevPropsHexValue } = prevProps
+    const { value: propsHexValue } = this.props
+    const { hexValue: stateHexValue } = this.state
+
+    if (prevPropsHexValue !== propsHexValue && propsHexValue !== stateHexValue) {
+      const decimalValue = this.getDecimalValue(this.props)
+      this.setState({ hexValue: propsHexValue, decimalValue })
+    }
+  }
+
+  getDecimalValue (props) {
+    const { value: hexValue, useFiat, currentCurrency, conversionRate } = props
+    const decimalValueString = useFiat
+      ? getValueFromWeiHex({
+        value: hexValue, toCurrency: currentCurrency, conversionRate, numberOfDecimals: 2,
+      })
+      : getValueFromWeiHex({
+        value: hexValue, toCurrency: ETH, numberOfDecimals: 6,
+      })
+
+    return Number(decimalValueString) || 0
+  }
+
+  handleChange = decimalValue => {
+    const { useFiat, currentCurrency: fromCurrency, conversionRate, onChange } = this.props
+
+    const hexValue = useFiat
+      ? getWeiHexFromDecimalValue({
+        value: decimalValue, fromCurrency, conversionRate, invertConversionRate: true,
+      })
+      : getWeiHexFromDecimalValue({
+        value: decimalValue, fromCurrency: ETH, fromDenomination: ETH, conversionRate,
+      })
+
+    this.setState({ hexValue, decimalValue })
+    onChange(hexValue)
+  }
+
+  handleBlur = () => {
+    this.props.onBlur(this.state.hexValue)
+  }
+
+  renderConversionComponent () {
+    const { useFiat, currentCurrency } = this.props
+    const { hexValue } = this.state
+    let currency, numberOfDecimals
+
+    if (useFiat) {
+      // Display ETH
+      currency = ETH
+      numberOfDecimals = 6
+    } else {
+      // Display Fiat
+      currency = currentCurrency
+      numberOfDecimals = 2
+    }
+
+    return (
+      <CurrencyDisplay
+        className="currency-input__conversion-component"
+        currency={currency}
+        value={hexValue}
+        numberOfDecimals={numberOfDecimals}
+      />
+    )
+  }
+
+  render () {
+    const { suffix, ...restProps } = this.props
+    const { decimalValue } = this.state
+
+    return (
+      <UnitInput
+        {...restProps}
+        suffix={suffix}
+        onChange={this.handleChange}
+        onBlur={this.handleBlur}
+        value={decimalValue}
+      >
+        { this.renderConversionComponent() }
+      </UnitInput>
+    )
+  }
+}

ui/app/components/currency-input/currency-input.container.js

@@ -0,0 +1,27 @@
+import { connect } from 'react-redux'
+import CurrencyInput from './currency-input.component'
+import { ETH } from '../../constants/common'
+
+const mapStateToProps = state => {
+  const { metamask: { currentCurrency, conversionRate } } = state
+
+  return {
+    currentCurrency,
+    conversionRate,
+  }
+}
+
+const mergeProps = (stateProps, dispatchProps, ownProps) => {
+  const { currentCurrency } = stateProps
+  const { useFiat } = ownProps
+  const suffix = useFiat ? currentCurrency.toUpperCase() : ETH
+
+  return {
+    ...stateProps,
+    ...dispatchProps,
+    ...ownProps,
+    suffix,
+  }
+}
+
+export default connect(mapStateToProps, null, mergeProps)(CurrencyInput)

ui/app/components/currency-input/index.js

@@ -0,0 +1 @@
+export { default } from './currency-input.container'

ui/app/components/currency-input/index.scss

@@ -0,0 +1,7 @@
+.currency-input {
+  &__conversion-component {
+    font-size: 12px;
+    line-height: 12px;
+    padding-left: 1px;
+  }
+}

ui/app/components/currency-input/tests/currency-input.component.test.js

@@ -0,0 +1,239 @@
+import React from 'react'
+import assert from 'assert'
+import { shallow, mount } from 'enzyme'
+import sinon from 'sinon'
+import { Provider } from 'react-redux'
+import configureMockStore from 'redux-mock-store'
+import CurrencyInput from '../currency-input.component'
+import UnitInput from '../../unit-input'
+import CurrencyDisplay from '../../currency-display'
+
+describe('CurrencyInput Component', () => {
+  describe('rendering', () => {
+    it('should render properly without a suffix', () => {
+      const wrapper = shallow(
+        <CurrencyInput />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find(UnitInput).length, 1)
+    })
+
+    it('should render properly with a suffix', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+
+      const wrapper = mount(
+        <Provider store={store}>
+          <CurrencyInput
+            suffix="ETH"
+          />
+        </Provider>
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find('.unit-input__suffix').length, 1)
+      assert.equal(wrapper.find('.unit-input__suffix').text(), 'ETH')
+      assert.equal(wrapper.find(CurrencyDisplay).length, 1)
+    })
+
+    it('should render properly with an ETH value', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+
+      const wrapper = mount(
+        <Provider store={store}>
+          <CurrencyInput
+            value="de0b6b3a7640000"
+            suffix="ETH"
+            currentCurrency="usd"
+            conversionRate={231.06}
+          />
+        </Provider>
+      )
+
+      assert.ok(wrapper)
+      const currencyInputInstance = wrapper.find(CurrencyInput).at(0).instance()
+      assert.equal(currencyInputInstance.state.decimalValue, 1)
+      assert.equal(currencyInputInstance.state.hexValue, 'de0b6b3a7640000')
+      assert.equal(wrapper.find('.unit-input__suffix').length, 1)
+      assert.equal(wrapper.find('.unit-input__suffix').text(), 'ETH')
+      assert.equal(wrapper.find('.unit-input__input').props().value, '1')
+      assert.equal(wrapper.find('.currency-display-component').text(), '$231.06 USD')
+    })
+
+    it('should render properly with a fiat value', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+
+      const wrapper = mount(
+        <Provider store={store}>
+          <CurrencyInput
+            value="f602f2234d0ea"
+            suffix="USD"
+            useFiat
+            currentCurrency="usd"
+            conversionRate={231.06}
+          />
+        </Provider>
+      )
+
+      assert.ok(wrapper)
+      const currencyInputInstance = wrapper.find(CurrencyInput).at(0).instance()
+      assert.equal(currencyInputInstance.state.decimalValue, 1)
+      assert.equal(currencyInputInstance.state.hexValue, 'f602f2234d0ea')
+      assert.equal(wrapper.find('.unit-input__suffix').length, 1)
+      assert.equal(wrapper.find('.unit-input__suffix').text(), 'USD')
+      assert.equal(wrapper.find('.unit-input__input').props().value, '1')
+      assert.equal(wrapper.find('.currency-display-component').text(), '0.004328 ETH')
+    })
+  })
+
+  describe('handling actions', () => {
+    const handleChangeSpy = sinon.spy()
+    const handleBlurSpy = sinon.spy()
+
+    afterEach(() => {
+      handleChangeSpy.resetHistory()
+      handleBlurSpy.resetHistory()
+    })
+
+    it('should call onChange and onBlur on input changes with the hex value for ETH', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+      const wrapper = mount(
+        <Provider store={store}>
+          <CurrencyInput
+            onChange={handleChangeSpy}
+            onBlur={handleBlurSpy}
+            suffix="ETH"
+            currentCurrency="usd"
+            conversionRate={231.06}
+          />
+        </Provider>
+      )
+
+      assert.ok(wrapper)
+      assert.equal(handleChangeSpy.callCount, 0)
+      assert.equal(handleBlurSpy.callCount, 0)
+
+      const currencyInputInstance = wrapper.find(CurrencyInput).at(0).instance()
+      assert.equal(currencyInputInstance.state.decimalValue, 0)
+      assert.equal(currencyInputInstance.state.hexValue, undefined)
+      assert.equal(wrapper.find('.currency-display-component').text(), '$0.00 USD')
+      const input = wrapper.find('input')
+      assert.equal(input.props().value, 0)
+
+      input.simulate('change', { target: { value: 1 } })
+      assert.equal(handleChangeSpy.callCount, 1)
+      assert.ok(handleChangeSpy.calledWith('de0b6b3a7640000'))
+      assert.equal(wrapper.find('.currency-display-component').text(), '$231.06 USD')
+      assert.equal(currencyInputInstance.state.decimalValue, 1)
+      assert.equal(currencyInputInstance.state.hexValue, 'de0b6b3a7640000')
+
+      assert.equal(handleBlurSpy.callCount, 0)
+      input.simulate('blur')
+      assert.equal(handleBlurSpy.callCount, 1)
+      assert.ok(handleBlurSpy.calledWith('de0b6b3a7640000'))
+    })
+
+    it('should call onChange and onBlur on input changes with the hex value for fiat', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+      const wrapper = mount(
+        <Provider store={store}>
+          <CurrencyInput
+            onChange={handleChangeSpy}
+            onBlur={handleBlurSpy}
+            suffix="USD"
+            currentCurrency="usd"
+            conversionRate={231.06}
+            useFiat
+          />
+        </Provider>
+      )
+
+      assert.ok(wrapper)
+      assert.equal(handleChangeSpy.callCount, 0)
+      assert.equal(handleBlurSpy.callCount, 0)
+
+      const currencyInputInstance = wrapper.find(CurrencyInput).at(0).instance()
+      assert.equal(currencyInputInstance.state.decimalValue, 0)
+      assert.equal(currencyInputInstance.state.hexValue, undefined)
+      assert.equal(wrapper.find('.currency-display-component').text(), '0 ETH')
+      const input = wrapper.find('input')
+      assert.equal(input.props().value, 0)
+
+      input.simulate('change', { target: { value: 1 } })
+      assert.equal(handleChangeSpy.callCount, 1)
+      assert.ok(handleChangeSpy.calledWith('f602f2234d0ea'))
+      assert.equal(wrapper.find('.currency-display-component').text(), '0.004328 ETH')
+      assert.equal(currencyInputInstance.state.decimalValue, 1)
+      assert.equal(currencyInputInstance.state.hexValue, 'f602f2234d0ea')
+
+      assert.equal(handleBlurSpy.callCount, 0)
+      input.simulate('blur')
+      assert.equal(handleBlurSpy.callCount, 1)
+      assert.ok(handleBlurSpy.calledWith('f602f2234d0ea'))
+    })
+
+    it('should change the state and pass in a new decimalValue when props.value changes', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+      const wrapper = shallow(
+        <Provider store={store}>
+          <CurrencyInput
+            onChange={handleChangeSpy}
+            onBlur={handleBlurSpy}
+            suffix="USD"
+            currentCurrency="usd"
+            conversionRate={231.06}
+            useFiat
+          />
+        </Provider>
+      )
+
+      assert.ok(wrapper)
+      const currencyInputInstance = wrapper.find(CurrencyInput).dive()
+      assert.equal(currencyInputInstance.state('decimalValue'), 0)
+      assert.equal(currencyInputInstance.state('hexValue'), undefined)
+      assert.equal(currencyInputInstance.find(UnitInput).props().value, 0)
+
+      currencyInputInstance.setProps({ value: '1ec05e43e72400' })
+      currencyInputInstance.update()
+      assert.equal(currencyInputInstance.state('decimalValue'), 2)
+      assert.equal(currencyInputInstance.state('hexValue'), '1ec05e43e72400')
+      assert.equal(currencyInputInstance.find(UnitInput).props().value, 2)
+    })
+  })
+})

ui/app/components/currency-input/tests/currency-input.container.test.js

@@ -0,0 +1,55 @@
+import assert from 'assert'
+import proxyquire from 'proxyquire'
+
+let mapStateToProps, mergeProps
+
+proxyquire('../currency-input.container.js', {
+  'react-redux': {
+    connect: (ms, md, mp) => {
+      mapStateToProps = ms
+      mergeProps = mp
+      return () => ({})
+    },
+  },
+})
+
+describe('CurrencyInput container', () => {
+  describe('mapStateToProps()', () => {
+    it('should return the correct props', () => {
+      const mockState = {
+        metamask: {
+          conversionRate: 280.45,
+          currentCurrency: 'usd',
+        },
+      }
+
+      assert.deepEqual(mapStateToProps(mockState), {
+        conversionRate: 280.45,
+        currentCurrency: 'usd',
+      })
+    })
+  })
+
+  describe('mergeProps()', () => {
+    it('should return the correct props', () => {
+      const mockStateProps = {
+        conversionRate: 280.45,
+        currentCurrency: 'usd',
+      }
+      const mockDispatchProps = {}
+
+      assert.deepEqual(mergeProps(mockStateProps, mockDispatchProps, { useFiat: true }), {
+        conversionRate: 280.45,
+        currentCurrency: 'usd',
+        useFiat: true,
+        suffix: 'USD',
+      })
+
+      assert.deepEqual(mergeProps(mockStateProps, mockDispatchProps, {}), {
+        conversionRate: 280.45,
+        currentCurrency: 'usd',
+        suffix: 'ETH',
+      })
+    })
+  })
+})

ui/app/components/index.scss

@@ -6,6 +6,10 @@
 
 @import './confirm-page-container/index';
 
+@import './currency-input/index';
+
+@import './currency-display/index';
+
 @import './error-message/index';
 
 @import './export-text-container/index';
@@ -49,3 +53,5 @@
 @import './app-header/index';
 
 @import './sidebars/index';
+
+@import './unit-input/index';

ui/app/components/modals/cancel-transaction/cancel-transaction-gas-fee/cancel-transaction-gas-fee.component.js

@@ -1,7 +1,7 @@
 import React, { PureComponent } from 'react'
 import PropTypes from 'prop-types'
-import CurrencyDisplay from '../../../currency-display'
+import UserPreferencedCurrencyDisplay from '../../../user-preferenced-currency-display'
-import { ETH } from '../../../../constants/common'
+import { PRIMARY, SECONDARY } from '../../../../constants/common'
 
 export default class CancelTransaction extends PureComponent {
   static propTypes = {
@@ -13,15 +13,15 @@ export default class CancelTransaction extends PureComponent {
 
     return (
       <div className="cancel-transaction-gas-fee">
-        <CurrencyDisplay
+        <UserPreferencedCurrencyDisplay
           className="cancel-transaction-gas-fee__eth"
-          currency={ETH}
           value={value}
-          numberOfDecimals={6}
+          type={PRIMARY}
         />
-        <CurrencyDisplay
+        <UserPreferencedCurrencyDisplay
           className="cancel-transaction-gas-fee__fiat"
           value={value}
+          type={SECONDARY}
         />
       </div>
     )

ui/app/components/modals/cancel-transaction/cancel-transaction-gas-fee/tests/cancel-transaction-gas-fee.component.test.js

@@ -2,7 +2,7 @@ import React from 'react'
 import assert from 'assert'
 import { shallow } from 'enzyme'
 import CancelTransactionGasFee from '../cancel-transaction-gas-fee.component'
-import CurrencyDisplay from '../../../../currency-display'
+import UserPreferencedCurrencyDisplay from '../../../../user-preferenced-currency-display'
 
 describe('CancelTransactionGasFee Component', () => {
   it('should render', () => {
@@ -13,12 +13,11 @@ describe('CancelTransactionGasFee Component', () => {
     )
 
     assert.ok(wrapper)
-    assert.equal(wrapper.find(CurrencyDisplay).length, 2)
+    assert.equal(wrapper.find(UserPreferencedCurrencyDisplay).length, 2)
-    const ethDisplay = wrapper.find(CurrencyDisplay).at(0)
+    const ethDisplay = wrapper.find(UserPreferencedCurrencyDisplay).at(0)
-    const fiatDisplay = wrapper.find(CurrencyDisplay).at(1)
+    const fiatDisplay = wrapper.find(UserPreferencedCurrencyDisplay).at(1)
 
     assert.equal(ethDisplay.props().value, '0x3b9aca00')
-    assert.equal(ethDisplay.props().currency, 'ETH')
     assert.equal(ethDisplay.props().className, 'cancel-transaction-gas-fee__eth')
 
     assert.equal(fiatDisplay.props().value, '0x3b9aca00')

ui/app/components/pages/confirm-token-transaction-base/confirm-token-transaction-base.component.js

@@ -1,12 +1,15 @@
 import React, { Component } from 'react'
 import PropTypes from 'prop-types'
 import ConfirmTransactionBase from '../confirm-transaction-base'
+import UserPreferencedCurrencyDisplay from '../../user-preferenced-currency-display'
 import {
   formatCurrency,
   convertTokenToFiat,
   addFiat,
   roundExponential,
 } from '../../../helpers/confirm-transaction/util'
+import { getWeiHexFromDecimalValue } from '../../../helpers/conversions.util'
+import { ETH, PRIMARY } from '../../../constants/common'
 
 export default class ConfirmTokenTransactionBase extends Component {
   static contextTypes = {
@@ -36,19 +39,48 @@ export default class ConfirmTokenTransactionBase extends Component {
     })
   }
 
-  getSubtitle () {
+  renderSubtitleComponent () {
-    const { currentCurrency, contractExchangeRate } = this.props
+    const { contractExchangeRate, tokenAmount } = this.props
 
-    if (typeof contractExchangeRate === 'undefined') {
+    const decimalEthValue = (tokenAmount * contractExchangeRate) || 0
-      return this.context.t('noConversionRateAvailable')
+    const hexWeiValue = getWeiHexFromDecimalValue({
-    } else {
+      value: decimalEthValue,
-      const fiatTransactionAmount = this.getFiatTransactionAmount()
+      fromCurrency: ETH,
-      const roundedFiatTransactionAmount = roundExponential(fiatTransactionAmount)
+      fromDenomination: ETH,
-      return formatCurrency(roundedFiatTransactionAmount, currentCurrency)
+    })
-    }
+
+    return typeof contractExchangeRate === 'undefined'
+      ? (
+        <span>
+          { this.context.t('noConversionRateAvailable') }
+        </span>
+      ) : (
+        <UserPreferencedCurrencyDisplay
+          value={hexWeiValue}
+          type={PRIMARY}
+          showEthLogo
+          hideLabel
+        />
+      )
+  }
+
+  renderPrimaryTotalTextOverride () {
+    const { tokenAmount, tokenSymbol, ethTransactionTotal } = this.props
+    const tokensText = `${tokenAmount} ${tokenSymbol}`
+
+    return (
+      <div>
+        <span>{ `${tokensText} + ` }</span>
+        <img
+          src="/images/eth.svg"
+          height="18"
+        />
+        <span>{ ethTransactionTotal }</span>
+      </div>
+    )
   }
 
-  getFiatTotalTextOverride () {
+  getSecondaryTotalTextOverride () {
     const { fiatTransactionTotal, currentCurrency, contractExchangeRate } = this.props
 
     if (typeof contractExchangeRate === 'undefined') {
@@ -67,7 +99,6 @@ export default class ConfirmTokenTransactionBase extends Component {
       tokenAddress,
       tokenSymbol,
       tokenAmount,
-      ethTransactionTotal,
       ...restProps
     } = this.props
 
@@ -78,9 +109,9 @@ export default class ConfirmTokenTransactionBase extends Component {
         toAddress={toAddress}
         identiconAddress={tokenAddress}
         title={tokensText}
-        subtitle={this.getSubtitle()}
+        subtitleComponent={this.renderSubtitleComponent()}
-        ethTotalTextOverride={`${tokensText} + \u2666 ${ethTransactionTotal}`}
+        primaryTotalTextOverride={this.renderPrimaryTotalTextOverride()}
-        fiatTotalTextOverride={this.getFiatTotalTextOverride()}
+        secondaryTotalTextOverride={this.getSecondaryTotalTextOverride()}
         {...restProps}
       />
     )

ui/app/components/pages/confirm-transaction-base/confirm-transaction-base.component.js

@@ -1,7 +1,6 @@
 import React, { Component } from 'react'
 import PropTypes from 'prop-types'
 import ConfirmPageContainer, { ConfirmDetailRow } from '../../confirm-page-container'
-import { formatCurrency } from '../../../helpers/confirm-transaction/util'
 import { isBalanceSufficient } from '../../send/send.utils'
 import { DEFAULT_ROUTE } from '../../../routes'
 import {
@@ -9,6 +8,8 @@ import {
   TRANSACTION_ERROR_KEY,
 } from '../../../constants/error-keys'
 import { CONFIRMED_STATUS, DROPPED_STATUS } from '../../../constants/transactions'
+import UserPreferencedCurrencyDisplay from '../../user-preferenced-currency-display'
+import { PRIMARY, SECONDARY } from '../../../constants/common'
 
 export default class ConfirmTransactionBase extends Component {
   static contextTypes = {
@@ -36,7 +37,9 @@ export default class ConfirmTransactionBase extends Component {
     fiatTransactionTotal: PropTypes.string,
     fromAddress: PropTypes.string,
     fromName: PropTypes.string,
-    hexGasTotal: PropTypes.string,
+    hexTransactionAmount: PropTypes.string,
+    hexTransactionFee: PropTypes.string,
+    hexTransactionTotal: PropTypes.string,
     isTxReprice: PropTypes.bool,
     methodData: PropTypes.object,
     nonce: PropTypes.string,
@@ -59,8 +62,8 @@ export default class ConfirmTransactionBase extends Component {
     detailsComponent: PropTypes.node,
     errorKey: PropTypes.string,
     errorMessage: PropTypes.string,
-    ethTotalTextOverride: PropTypes.string,
+    primaryTotalTextOverride: PropTypes.oneOfType([PropTypes.string, PropTypes.node]),
-    fiatTotalTextOverride: PropTypes.string,
+    secondaryTotalTextOverride: PropTypes.string,
     hideData: PropTypes.bool,
     hideDetails: PropTypes.bool,
     hideSubtitle: PropTypes.bool,
@@ -70,8 +73,10 @@ export default class ConfirmTransactionBase extends Component {
     onEditGas: PropTypes.func,
     onSubmit: PropTypes.func,
     subtitle: PropTypes.string,
+    subtitleComponent: PropTypes.node,
     summaryComponent: PropTypes.node,
     title: PropTypes.string,
+    titleComponent: PropTypes.node,
     valid: PropTypes.bool,
     warning: PropTypes.string,
   }
@@ -105,7 +110,7 @@ export default class ConfirmTransactionBase extends Component {
     const {
       balance,
       conversionRate,
-      hexGasTotal,
+      hexTransactionFee,
       txData: {
         simulationFails,
         txParams: {
@@ -116,7 +121,7 @@ export default class ConfirmTransactionBase extends Component {
 
     const insufficientBalance = balance && !isBalanceSufficient({
       amount,
-      gasTotal: hexGasTotal || '0x0',
+      gasTotal: hexTransactionFee || '0x0',
       balance,
       conversionRate,
     })
@@ -153,13 +158,10 @@ export default class ConfirmTransactionBase extends Component {
   renderDetails () {
     const {
       detailsComponent,
-      fiatTransactionFee,
+      primaryTotalTextOverride,
-      ethTransactionFee,
+      secondaryTotalTextOverride,
-      currentCurrency,
+      hexTransactionFee,
-      fiatTransactionTotal,
+      hexTransactionTotal,
-      ethTransactionTotal,
-      fiatTotalTextOverride,
-      ethTotalTextOverride,
       hideDetails,
     } = this.props
 
@@ -167,16 +169,13 @@ export default class ConfirmTransactionBase extends Component {
       return null
     }
 
-    const formattedCurrency = formatCurrency(fiatTransactionTotal, currentCurrency)
-
     return (
       detailsComponent || (
         <div className="confirm-page-container-content__details">
           <div className="confirm-page-container-content__gas-fee">
             <ConfirmDetailRow
               label="Gas Fee"
-              fiatText={formatCurrency(fiatTransactionFee, currentCurrency)}
+              value={hexTransactionFee}
-              ethText={`\u2666 ${ethTransactionFee}`}
               headerText="Edit"
               headerTextClassName="confirm-detail-row__header-text--edit"
               onHeaderClick={() => this.handleEditGas()}
@@ -185,11 +184,12 @@ export default class ConfirmTransactionBase extends Component {
           <div>
             <ConfirmDetailRow
               label="Total"
-              fiatText={fiatTotalTextOverride || formattedCurrency}
+              value={hexTransactionTotal}
-              ethText={ethTotalTextOverride || `\u2666 ${ethTransactionTotal}`}
+              primaryText={primaryTotalTextOverride}
+              secondaryText={secondaryTotalTextOverride}
               headerText="Amount + Gas Fee"
               headerTextClassName="confirm-detail-row__header-text--total"
-              fiatTextColor="#2f9ae0"
+              primaryValueTextColor="#2f9ae0"
             />
           </div>
         </div>
@@ -311,6 +311,43 @@ export default class ConfirmTransactionBase extends Component {
     }
   }
 
+  renderTitleComponent () {
+    const { title, titleComponent, hexTransactionAmount } = this.props
+
+    // Title string passed in by props takes priority
+    if (title) {
+      return null
+    }
+
+    return titleComponent || (
+      <UserPreferencedCurrencyDisplay
+        value={hexTransactionAmount}
+        type={PRIMARY}
+        showEthLogo
+        ethLogoHeight="26"
+        hideLabel
+      />
+    )
+  }
+
+  renderSubtitleComponent () {
+    const { subtitle, subtitleComponent, hexTransactionAmount } = this.props
+
+    // Subtitle string passed in by props takes priority
+    if (subtitle) {
+      return null
+    }
+
+    return subtitleComponent || (
+      <UserPreferencedCurrencyDisplay
+        value={hexTransactionAmount}
+        type={SECONDARY}
+        showEthLogo
+        hideLabel
+      />
+    )
+  }
+
   render () {
     const {
       isTxReprice,
@@ -319,12 +356,9 @@ export default class ConfirmTransactionBase extends Component {
       toName,
       toAddress,
       methodData,
-      ethTransactionAmount,
-      fiatTransactionAmount,
       valid: propsValid = true,
       errorMessage,
       errorKey: propsErrorKey,
-      currentCurrency,
       action,
       title,
       subtitle,
@@ -341,7 +375,6 @@ export default class ConfirmTransactionBase extends Component {
     const { submitting, submitError } = this.state
 
     const { name } = methodData
-    const fiatConvertedAmount = formatCurrency(fiatTransactionAmount, currentCurrency)
     const { valid, errorKey } = this.getErrorKey()
 
     return (
@@ -352,8 +385,10 @@ export default class ConfirmTransactionBase extends Component {
         toAddress={toAddress}
         showEdit={onEdit && !isTxReprice}
         action={action || name || this.context.t('unknownFunction')}
-        title={title || `${fiatConvertedAmount} ${currentCurrency.toUpperCase()}`}
+        title={title}
-        subtitle={subtitle || `\u2666 ${ethTransactionAmount}`}
+        titleComponent={this.renderTitleComponent()}
+        subtitle={subtitle}
+        subtitleComponent={this.renderSubtitleComponent()}
         hideSubtitle={hideSubtitle}
         summaryComponent={summaryComponent}
         detailsComponent={this.renderDetails()}

ui/app/components/pages/confirm-transaction-base/confirm-transaction-base.container.js

@@ -36,7 +36,9 @@ const mapStateToProps = (state, props) => {
     fiatTransactionAmount,
     fiatTransactionFee,
     fiatTransactionTotal,
-    hexGasTotal,
+    hexTransactionAmount,
+    hexTransactionFee,
+    hexTransactionTotal,
     tokenData,
     methodData,
     txData,
@@ -87,7 +89,9 @@ const mapStateToProps = (state, props) => {
     fiatTransactionAmount,
     fiatTransactionFee,
     fiatTransactionTotal,
-    hexGasTotal,
+    hexTransactionAmount,
+    hexTransactionFee,
+    hexTransactionTotal,
     txData,
     tokenData,
     methodData,

ui/app/components/pages/settings/settings-tab/index.scss

@@ -48,4 +48,22 @@
       border-color: $ecstasy;
     }
   }
+
+  &__radio-buttons {
+    display: flex;
+    align-items: center;
+  }
+
+  &__radio-button {
+    display: flex;
+    align-items: center;
+
+    &:not(:last-child) {
+      margin-right: 16px;
+    }
+  }
+
+  &__radio-label {
+    padding-left: 4px;
+  }
 }

ui/app/components/pages/settings/settings-tab/settings-tab.component.js

@@ -55,6 +55,8 @@ export default class SettingsTab extends PureComponent {
     sendHexData: PropTypes.bool,
     currentCurrency: PropTypes.string,
     conversionDate: PropTypes.number,
+    useETHAsPrimaryCurrency: PropTypes.bool,
+    setUseETHAsPrimaryCurrencyPreference: PropTypes.func,
   }
 
   state = {
@@ -339,6 +341,56 @@ export default class SettingsTab extends PureComponent {
     )
   }
 
+  renderUseEthAsPrimaryCurrency () {
+    const { t } = this.context
+    const { useETHAsPrimaryCurrency, setUseETHAsPrimaryCurrencyPreference } = this.props
+
+    return (
+      <div className="settings-page__content-row">
+        <div className="settings-page__content-item">
+          <span>{ t('primaryCurrencySetting') }</span>
+          <div className="settings-page__content-description">
+            { t('primaryCurrencySettingDescription') }
+          </div>
+        </div>
+        <div className="settings-page__content-item">
+          <div className="settings-page__content-item-col">
+            <div className="settings-tab__radio-buttons">
+              <div className="settings-tab__radio-button">
+                <input
+                  type="radio"
+                  id="eth-primary-currency"
+                  onChange={() => setUseETHAsPrimaryCurrencyPreference(true)}
+                  checked={Boolean(useETHAsPrimaryCurrency)}
+                />
+                <label
+                  htmlFor="eth-primary-currency"
+                  className="settings-tab__radio-label"
+                >
+                  { t('eth') }
+                </label>
+              </div>
+              <div className="settings-tab__radio-button">
+                <input
+                  type="radio"
+                  id="fiat-primary-currency"
+                  onChange={() => setUseETHAsPrimaryCurrencyPreference(false)}
+                  checked={!useETHAsPrimaryCurrency}
+                />
+                <label
+                  htmlFor="fiat-primary-currency"
+                  className="settings-tab__radio-label"
+                >
+                  { t('fiat') }
+                </label>
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+    )
+  }
+
   render () {
     const { warning, isMascara } = this.props
 
@@ -346,6 +398,7 @@ export default class SettingsTab extends PureComponent {
       <div className="settings-page__content">
         { warning && <div className="settings-tab__error">{ warning }</div> }
         { this.renderCurrentConversion() }
+        { this.renderUseEthAsPrimaryCurrency() }
         { this.renderCurrentLocale() }
         { this.renderNewRpcUrl() }
         { this.renderStateLogs() }

ui/app/components/pages/settings/settings-tab/settings-tab.container.js

@@ -11,7 +11,9 @@ import {
   updateCurrentLocale,
   setFeatureFlag,
   showModal,
+  setUseETHAsPrimaryCurrencyPreference,
 } from '../../../../actions'
+import { preferencesSelector } from '../../../../selectors'
 
 const mapStateToProps = state => {
   const { appState: { warning }, metamask } = state
@@ -24,6 +26,7 @@ const mapStateToProps = state => {
     isMascara,
     currentLocale,
   } = metamask
+  const { useETHAsPrimaryCurrency } = preferencesSelector(state)
 
   return {
     warning,
@@ -34,6 +37,7 @@ const mapStateToProps = state => {
     useBlockie,
     sendHexData,
     provider,
+    useETHAsPrimaryCurrency,
   }
 }
 
@@ -50,6 +54,9 @@ const mapDispatchToProps = dispatch => {
     },
     setHexDataFeatureFlag: shouldShow => dispatch(setFeatureFlag('sendHexData', shouldShow)),
     showResetAccountConfirmationModal: () => dispatch(showModal({ name: 'CONFIRM_RESET_ACCOUNT' })),
+    setUseETHAsPrimaryCurrencyPreference: value => {
+      return dispatch(setUseETHAsPrimaryCurrencyPreference(value))
+    },
   }
 }
 

ui/app/components/send/account-list-item/account-list-item.component.js

@@ -2,7 +2,8 @@ import React, { Component } from 'react'
 import PropTypes from 'prop-types'
 import { checksumAddress } from '../../../util'
 import Identicon from '../../identicon'
-import CurrencyDisplay from '../currency-display'
+import UserPreferencedCurrencyDisplay from '../../user-preferenced-currency-display'
+import { PRIMARY, SECONDARY } from '../../../constants/common'
 
 export default class AccountListItem extends Component {
 
@@ -25,8 +26,6 @@ export default class AccountListItem extends Component {
     const {
       account,
       className,
-      conversionRate,
-      currentCurrency,
       displayAddress = false,
       displayBalance = true,
       handleClick,
@@ -57,16 +56,20 @@ export default class AccountListItem extends Component {
         { checksumAddress(address) }
       </div>}
 
-      {displayBalance && <CurrencyDisplay
+      {
-        className="account-list-item__account-balances"
+        displayBalance && (
-        conversionRate={conversionRate}
+          <div className="account-list-item__account-balances">
-        convertedBalanceClassName="account-list-item__account-secondary-balance"
+            <UserPreferencedCurrencyDisplay
-        convertedCurrency={currentCurrency}
+              type={PRIMARY}
-        primaryBalanceClassName="account-list-item__account-primary-balance"
+              value={balance}
-        primaryCurrency="ETH"
+            />
-        readOnly={true}
+            <UserPreferencedCurrencyDisplay
-        value={balance}
+              type={SECONDARY}
-      />}
+              value={balance}
+            />
+          </div>
+        )
+      }
 
     </div>)
   }

ui/app/components/send/account-list-item/tests/account-list-item-component.test.js

@@ -4,7 +4,7 @@ import { shallow } from 'enzyme'
 import sinon from 'sinon'
 import proxyquire from 'proxyquire'
 import Identicon from '../../../identicon'
-import CurrencyDisplay from '../../currency-display'
+import UserPreferencedCurrencyDisplay from '../../../user-preferenced-currency-display'
 
 const utilsMethodStubs = {
   checksumAddress: sinon.stub().returns('mockCheckSumAddress'),
@@ -114,17 +114,11 @@ describe('AccountListItem Component', function () {
 
     it('should render a CurrencyDisplay with the correct props if displayBalance is true', () => {
       wrapper.setProps({ displayBalance: true })
-      assert.equal(wrapper.find(CurrencyDisplay).length, 1)
+      assert.equal(wrapper.find(UserPreferencedCurrencyDisplay).length, 2)
       assert.deepEqual(
-        wrapper.find(CurrencyDisplay).props(),
+        wrapper.find(UserPreferencedCurrencyDisplay).at(0).props(),
         {
-          className: 'account-list-item__account-balances',
+          type: 'PRIMARY',
-          conversionRate: 4,
-          convertedBalanceClassName: 'account-list-item__account-secondary-balance',
-          convertedCurrency: 'mockCurrentyCurrency',
-          primaryBalanceClassName: 'account-list-item__account-primary-balance',
-          primaryCurrency: 'ETH',
-          readOnly: true,
           value: 'mockBalance',
         }
       )
@@ -132,7 +126,7 @@ describe('AccountListItem Component', function () {
 
     it('should not render a CurrencyDisplay if displayBalance is false', () => {
       wrapper.setProps({ displayBalance: false })
-      assert.equal(wrapper.find(CurrencyDisplay).length, 0)
+      assert.equal(wrapper.find(UserPreferencedCurrencyDisplay).length, 0)
     })
   })
 })

ui/app/components/send/currency-display/currency-display.js

@@ -1,186 +0,0 @@
-const Component = require('react').Component
-const h = require('react-hyperscript')
-const inherits = require('util').inherits
-const { conversionUtil, multiplyCurrencies } = require('../../../conversion-util')
-const { removeLeadingZeroes } = require('../send.utils')
-const currencyFormatter = require('currency-formatter')
-const currencies = require('currency-formatter/currencies')
-const ethUtil = require('ethereumjs-util')
-const PropTypes = require('prop-types')
-
-CurrencyDisplay.contextTypes = {
-  t: PropTypes.func,
-}
-
-module.exports = CurrencyDisplay
-
-inherits(CurrencyDisplay, Component)
-function CurrencyDisplay () {
-  Component.call(this)
-}
-
-function toHexWei (value) {
-  return conversionUtil(value, {
-    fromNumericBase: 'dec',
-    toNumericBase: 'hex',
-    toDenomination: 'WEI',
-  })
-}
-
-CurrencyDisplay.prototype.componentWillMount = function () {
-  this.setState({
-    valueToRender: this.getValueToRender(this.props),
-  })
-}
-
-CurrencyDisplay.prototype.componentWillReceiveProps = function (nextProps) {
-  const currentValueToRender = this.getValueToRender(this.props)
-  const newValueToRender = this.getValueToRender(nextProps)
-  if (currentValueToRender !== newValueToRender) {
-    this.setState({
-      valueToRender: newValueToRender,
-    })
-  }
-}
-
-CurrencyDisplay.prototype.getAmount = function (value) {
-  const { selectedToken } = this.props
-  const { decimals } = selectedToken || {}
-  const multiplier = Math.pow(10, Number(decimals || 0))
-
-  const sendAmount = multiplyCurrencies(value || '0', multiplier, {toNumericBase: 'hex'})
-
-  return selectedToken
-    ? sendAmount
-    : toHexWei(value)
-}
-
-CurrencyDisplay.prototype.getValueToRender = function ({ selectedToken, conversionRate, value, readOnly }) {
-  if (value === '0x0') return readOnly ? '0' : ''
-  const { decimals, symbol } = selectedToken || {}
-  const multiplier = Math.pow(10, Number(decimals || 0))
-
-  return selectedToken
-    ? conversionUtil(ethUtil.addHexPrefix(value), {
-      fromNumericBase: 'hex',
-      toNumericBase: 'dec',
-      toCurrency: symbol,
-      conversionRate: multiplier,
-      invertConversionRate: true,
-    })
-    : conversionUtil(ethUtil.addHexPrefix(value), {
-      fromNumericBase: 'hex',
-      toNumericBase: 'dec',
-      fromDenomination: 'WEI',
-      numberOfDecimals: 9,
-      conversionRate,
-    })
-}
-
-CurrencyDisplay.prototype.getConvertedValueToRender = function (nonFormattedValue) {
-  const { primaryCurrency, convertedCurrency, conversionRate } = this.props
-
-  if (conversionRate === 0 || conversionRate === null || conversionRate === undefined) {
-    if (nonFormattedValue !== 0) {
-      return null
-    }
-  }
-
-  let convertedValue = conversionUtil(nonFormattedValue, {
-    fromNumericBase: 'dec',
-    fromCurrency: primaryCurrency,
-    toCurrency: convertedCurrency,
-    numberOfDecimals: 2,
-    conversionRate,
-  })
-
-  convertedValue = Number(convertedValue).toFixed(2)
-  const upperCaseCurrencyCode = convertedCurrency.toUpperCase()
-  return currencies.find(currency => currency.code === upperCaseCurrencyCode)
-    ? currencyFormatter.format(Number(convertedValue), {
-      code: upperCaseCurrencyCode,
-    })
-      : convertedValue
-  }
-
-CurrencyDisplay.prototype.handleChange = function (newVal) {
-  this.setState({ valueToRender: removeLeadingZeroes(newVal) })
-  this.props.onChange(this.getAmount(newVal))
-}
-
-CurrencyDisplay.prototype.getInputWidth = function (valueToRender, readOnly) {
-  const valueString = String(valueToRender)
-  const valueLength = valueString.length || 1
-  const decimalPointDeficit = valueString.match(/\./) ? -0.5 : 0
-  return (valueLength + decimalPointDeficit + 0.75) + 'ch'
-}
-
-CurrencyDisplay.prototype.onlyRenderConversions = function (convertedValueToRender) {
-  const {
-    convertedBalanceClassName = 'currency-display__converted-value',
-    convertedCurrency,
-  } = this.props
-    return h('div', {
-    className: convertedBalanceClassName,
-    }, convertedValueToRender == null
-      ? this.context.t('noConversionRateAvailable')
-      : `${convertedValueToRender} ${convertedCurrency.toUpperCase()}`
-)
-  }
-
-CurrencyDisplay.prototype.render = function () {
-  const {
-    className = 'currency-display',
-    primaryBalanceClassName = 'currency-display__input',
-    primaryCurrency,
-    readOnly = false,
-    inError = false,
-    onBlur,
-    step,
-  } = this.props
-  const { valueToRender } = this.state
-
-  const convertedValueToRender = this.getConvertedValueToRender(valueToRender)
-
-  return h('div', {
-    className,
-    style: {
-      borderColor: inError ? 'red' : null,
-    },
-    onClick: () => {
-      this.currencyInput && this.currencyInput.focus()
-    },
-  }, [
-
-    h('div.currency-display__primary-row', [
-
-      h('div.currency-display__input-wrapper', [
-
-        h('input', {
-          className: primaryBalanceClassName,
-          value: `${valueToRender}`,
-          placeholder: '0',
-          type: 'number',
-          readOnly,
-          ...(!readOnly ? {
-            onChange: e => this.handleChange(e.target.value),
-            onBlur: () => onBlur(this.getAmount(valueToRender)),
-          } : {}),
-          ref: input => { this.currencyInput = input },
-          style: {
-            width: this.getInputWidth(valueToRender, readOnly),
-          },
-          min: 0,
-          step,
-        }),
-
-        h('span.currency-display__currency-symbol', primaryCurrency),
-
-      ]),
-
-    ]), this.onlyRenderConversions(convertedValueToRender),
-
-  ])
-
-}
-

ui/app/components/send/currency-display/index.js

@@ -1 +0,0 @@
-export { default } from './currency-display.js'

ui/app/components/send/currency-display/tests/currency-display.test.js

@@ -1,91 +0,0 @@
-import React from 'react'
-import assert from 'assert'
-import sinon from 'sinon'
-import { shallow, mount } from 'enzyme'
-import CurrencyDisplay from '../currency-display'
-
-describe('', () => {
-
-  const token = {
-    address: '0xTest',
-    symbol: 'TST',
-    decimals: '13',
-  }
-
-  it('retuns ETH value for wei value', () => {
-    const wrapper = mount(<CurrencyDisplay />, {context: {t: str => str + '_t'}})
-
-    const value = wrapper.instance().getValueToRender({
-      // 1000000000000000000
-      value: 'DE0B6B3A7640000',
-    })
-
-    assert.equal(value, 1)
-  })
-
-  it('returns value of token based on token decimals', () => {
-    const wrapper = mount(<CurrencyDisplay />, {context: {t: str => str + '_t'}})
-
-    const value = wrapper.instance().getValueToRender({
-      selectedToken: token,
-      // 1000000000000000000
-      value: 'DE0B6B3A7640000',
-    })
-
-    assert.equal(value, 100000)
-  })
-
-  it('returns hex value with decimal adjustment', () => {
-
-    const wrapper = mount(
-      <CurrencyDisplay
-        selectedToken={token}
-      />, {context: {t: str => str + '_t'}})
-
-    const value = wrapper.instance().getAmount(1)
-    // 10000000000000
-    assert.equal(value, '9184e72a000')
-  })
-
-  it('#getConvertedValueToRender converts input value based on conversionRate', () => {
-
-    const wrapper = mount(
-      <CurrencyDisplay
-        primaryCurrency={'usd'}
-        convertedCurrency={'ja'}
-        conversionRate={2}
-      />, {context: {t: str => str + '_t'}})
-
-    const value = wrapper.instance().getConvertedValueToRender(32)
-
-    assert.equal(value, 64)
-  })
-
-  it('#onlyRenderConversions renders single element for converted currency and value', () => {
-    const wrapper = mount(
-      <CurrencyDisplay
-        convertedCurrency={'test'}
-      />, {context: {t: str => str + '_t'}})
-
-    const value = wrapper.instance().onlyRenderConversions(10)
-    assert.equal(value.props.className, 'currency-display__converted-value')
-    assert.equal(value.props.children, '10 TEST')
-  })
-
-  it('simulates change value in input', () => {
-    const handleChangeSpy = sinon.spy()
-
-    const wrapper = shallow(
-      <CurrencyDisplay
-        onChange={handleChangeSpy}
-      />, {context: {t: str => str + '_t'}})
-
-    const input = wrapper.find('input')
-    input.simulate('focus')
-    input.simulate('change', { target: { value: '100' } })
-
-    assert.equal(wrapper.state().valueToRender, '100')
-    assert.equal(wrapper.find('input').prop('value'), '100')
-  })
-
-})

ui/app/components/send/send-content/send-amount-row/send-amount-row.component.js

@@ -2,7 +2,8 @@ import React, { Component } from 'react'
 import PropTypes from 'prop-types'
 import SendRowWrapper from '../send-row-wrapper/'
 import AmountMaxButton from './amount-max-button/'
-import CurrencyDisplay from '../../currency-display'
+import UserPreferencedCurrencyInput from '../../../user-preferenced-currency-input'
+import UserPreferencedTokenInput from '../../../user-preferenced-token-input'
 
 export default class SendAmountRow extends Component {
 
@@ -84,16 +85,25 @@ export default class SendAmountRow extends Component {
     }
   }
 
+  renderInput () {
+    const { amount, inError, selectedToken } = this.props
+    const Component = selectedToken ? UserPreferencedTokenInput : UserPreferencedCurrencyInput
+
+    return (
+      <Component
+        onChange={newAmount => this.validateAmount(newAmount)}
+        onBlur={newAmount => {
+          this.updateGas(newAmount)
+          this.updateAmount(newAmount)
+        }}
+        error={inError}
+        value={amount}
+      />
+    )
+  }
+
   render () {
-    const {
+    const { gasTotal, inError } = this.props
-      amount,
-      amountConversionRate,
-      convertedCurrency,
-      gasTotal,
-      inError,
-      primaryCurrency,
-      selectedToken,
-    } = this.props
 
     return (
       <SendRowWrapper
@@ -102,20 +112,7 @@ export default class SendAmountRow extends Component {
         errorType={'amount'}
       >
         {!inError && gasTotal && <AmountMaxButton />}
-        <CurrencyDisplay
+        { this.renderInput() }
-          conversionRate={amountConversionRate}
-          convertedCurrency={convertedCurrency}
-          onBlur={newAmount => {
-            this.updateGas(newAmount)
-            this.updateAmount(newAmount)
-          }}
-          onChange={newAmount => this.validateAmount(newAmount)}
-          inError={inError}
-          primaryCurrency={primaryCurrency || 'ETH'}
-          selectedToken={selectedToken}
-          value={amount}
-          step="any"
-        />
       </SendRowWrapper>
     )
   }

ui/app/components/send/send-content/send-amount-row/tests/send-amount-row-component.test.js

@@ -6,7 +6,7 @@ import SendAmountRow from '../send-amount-row.component.js'
 
 import SendRowWrapper from '../../send-row-wrapper/send-row-wrapper.component'
 import AmountMaxButton from '../amount-max-button/amount-max-button.container'
-import CurrencyDisplay from '../../../currency-display'
+import UserPreferencedTokenInput from '../../../../user-preferenced-token-input'
 
 const propsMethodSpies = {
   setMaxModeTo: sinon.spy(),
@@ -150,26 +150,19 @@ describe('SendAmountRow Component', function () {
       assert(wrapper.find(SendRowWrapper).childAt(0).is(AmountMaxButton))
     })
 
-    it('should render a CurrencyDisplay as the second child of the SendRowWrapper', () => {
+    it('should render a UserPreferencedTokenInput as the second child of the SendRowWrapper', () => {
-      assert(wrapper.find(SendRowWrapper).childAt(1).is(CurrencyDisplay))
+      console.log('HI', wrapper.find(SendRowWrapper).childAt(1))
+      assert(wrapper.find(SendRowWrapper).childAt(1).is(UserPreferencedTokenInput))
     })
 
-    it('should render the CurrencyDisplay with the correct props', () => {
+    it('should render the UserPreferencedTokenInput with the correct props', () => {
       const {
-        conversionRate,
-        convertedCurrency,
         onBlur,
         onChange,
-        inError,
+        error,
-        primaryCurrency,
-        selectedToken,
         value,
       } = wrapper.find(SendRowWrapper).childAt(1).props()
-      assert.equal(conversionRate, 'mockAmountConversionRate')
+      assert.equal(error, false)
-      assert.equal(convertedCurrency, 'mockConvertedCurrency')
-      assert.equal(inError, false)
-      assert.equal(primaryCurrency, 'mockPrimaryCurrency')
-      assert.deepEqual(selectedToken, { address: 'mockTokenAddress' })
       assert.equal(value, 'mockAmount')
       assert.equal(SendAmountRow.prototype.updateGas.callCount, 0)
       assert.equal(SendAmountRow.prototype.updateAmount.callCount, 0)
@@ -192,11 +185,5 @@ describe('SendAmountRow Component', function () {
         ['mockNewAmount']
       )
     })
-
-    it('should pass the default primaryCurrency to the CurrencyDisplay if primaryCurrency is falsy', () => {
-      wrapper.setProps({ primaryCurrency: null })
-      const { primaryCurrency } = wrapper.find(SendRowWrapper).childAt(1).props()
-      assert.equal(primaryCurrency, 'ETH')
-    })
   })
 })

ui/app/components/send/send-content/send-gas-row/gas-fee-display/gas-fee-display.component.js

@@ -1,7 +1,7 @@
 import React, {Component} from 'react'
 import PropTypes from 'prop-types'
-import CurrencyDisplay from '../../../../send/currency-display'
+import UserPreferencedCurrencyDisplay from '../../../../user-preferenced-currency-display'
-
+import { PRIMARY, SECONDARY } from '../../../../../constants/common'
 
 export default class GasFeeDisplay extends Component {
 
@@ -19,27 +19,24 @@ export default class GasFeeDisplay extends Component {
   };
 
   render () {
-    const {
+    const { gasTotal, onClick, gasLoadingError } = this.props
-      conversionRate,
-      gasTotal,
-      onClick,
-      primaryCurrency = 'ETH',
-      convertedCurrency,
-      gasLoadingError,
-    } = this.props
 
     return (
       <div className="send-v2__gas-fee-display">
         {gasTotal
-          ? <CurrencyDisplay
+          ? (
-              primaryCurrency={primaryCurrency}
+            <div className="currency-display">
-              convertedCurrency={convertedCurrency}
+              <UserPreferencedCurrencyDisplay
-              value={gasTotal}
+                value={gasTotal}
-              conversionRate={conversionRate}
+                type={PRIMARY}
-              gasLoadingError={gasLoadingError}
+              />
-              convertedPrefix={'$'}
+              <UserPreferencedCurrencyDisplay
-              readOnly
+                className="currency-display__converted-value"
-            />
+                value={gasTotal}
+                type={SECONDARY}
+              />
+            </div>
+          )
           : gasLoadingError
             ? <div className="currency-display.currency-display--message">
                 {this.context.t('setGasPrice')}

ui/app/components/send/send-content/send-gas-row/gas-fee-display/test/gas-fee-display.component.test.js

@@ -2,7 +2,7 @@ import React from 'react'
 import assert from 'assert'
 import {shallow} from 'enzyme'
 import GasFeeDisplay from '../gas-fee-display.component'
-import CurrencyDisplay from '../../../../../send/currency-display'
+import UserPreferencedCurrencyDisplay from '../../../../../user-preferenced-currency-display'
 import sinon from 'sinon'
 
 
@@ -29,17 +29,15 @@ describe('SendGasRow Component', function () {
 
   describe('render', () => {
     it('should render a CurrencyDisplay component', () => {
-      assert.equal(wrapper.find(CurrencyDisplay).length, 1)
+      assert.equal(wrapper.find(UserPreferencedCurrencyDisplay).length, 2)
     })
 
     it('should render the CurrencyDisplay with the correct props', () => {
       const {
-        conversionRate,
+        type,
-        convertedCurrency,
         value,
-      } = wrapper.find(CurrencyDisplay).props()
+      } = wrapper.find(UserPreferencedCurrencyDisplay).at(0).props()
-      assert.equal(conversionRate, 20)
+      assert.equal(type, 'PRIMARY')
-      assert.equal(convertedCurrency, 'mockConvertedCurrency')
       assert.equal(value, 'mockGasTotal')
     })
 

ui/app/components/token-input/index.js

@@ -0,0 +1 @@
+export { default } from './token-input.container'

ui/app/components/token-input/tests/token-input.component.test.js

@@ -0,0 +1,308 @@
+import React from 'react'
+import PropTypes from 'prop-types'
+import assert from 'assert'
+import { shallow, mount } from 'enzyme'
+import sinon from 'sinon'
+import { Provider } from 'react-redux'
+import configureMockStore from 'redux-mock-store'
+import TokenInput from '../token-input.component'
+import UnitInput from '../../unit-input'
+import CurrencyDisplay from '../../currency-display'
+
+describe('TokenInput Component', () => {
+  const t = key => `translate ${key}`
+
+  describe('rendering', () => {
+    it('should render properly without a token', () => {
+      const wrapper = shallow(
+        <TokenInput />,
+        { context: { t } }
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find(UnitInput).length, 1)
+    })
+
+    it('should render properly with a token', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+
+      const wrapper = mount(
+        <Provider store={store}>
+          <TokenInput
+            selectedToken={{
+              address: '0x1',
+              decimals: '4',
+              symbol: 'ABC',
+            }}
+            suffix="ABC"
+          />
+        </Provider>,
+        { context: { t },
+          childContextTypes: {
+            t: PropTypes.func,
+          },
+        },
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find('.unit-input__suffix').length, 1)
+      assert.equal(wrapper.find('.unit-input__suffix').text(), 'ABC')
+      assert.equal(wrapper.find('.currency-input__conversion-component').length, 1)
+      assert.equal(wrapper.find('.currency-input__conversion-component').text(), 'translate noConversionRateAvailable')
+    })
+
+    it('should render properly with a token and selectedTokenExchangeRate', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+
+      const wrapper = mount(
+        <Provider store={store}>
+          <TokenInput
+            selectedToken={{
+              address: '0x1',
+              decimals: '4',
+              symbol: 'ABC',
+            }}
+            suffix="ABC"
+            selectedTokenExchangeRate={2}
+          />
+        </Provider>,
+        { context: { t },
+          childContextTypes: {
+            t: PropTypes.func,
+          },
+        },
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find('.unit-input__suffix').length, 1)
+      assert.equal(wrapper.find('.unit-input__suffix').text(), 'ABC')
+      assert.equal(wrapper.find(CurrencyDisplay).length, 1)
+    })
+
+    it('should render properly with a token value for ETH', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+
+      const wrapper = mount(
+        <Provider store={store}>
+          <TokenInput
+            value="2710"
+            selectedToken={{
+              address: '0x1',
+              decimals: '4',
+              symbol: 'ABC',
+            }}
+            suffix="ABC"
+            selectedTokenExchangeRate={2}
+          />
+        </Provider>
+      )
+
+      assert.ok(wrapper)
+      const tokenInputInstance = wrapper.find(TokenInput).at(0).instance()
+      assert.equal(tokenInputInstance.state.decimalValue, 1)
+      assert.equal(tokenInputInstance.state.hexValue, '2710')
+      assert.equal(wrapper.find('.unit-input__suffix').length, 1)
+      assert.equal(wrapper.find('.unit-input__suffix').text(), 'ABC')
+      assert.equal(wrapper.find('.unit-input__input').props().value, '1')
+      assert.equal(wrapper.find('.currency-display-component').text(), '2 ETH')
+    })
+
+    it('should render properly with a token value for fiat', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+
+      const wrapper = mount(
+        <Provider store={store}>
+          <TokenInput
+            value="2710"
+            selectedToken={{
+              address: '0x1',
+              decimals: '4',
+              symbol: 'ABC',
+            }}
+            suffix="ABC"
+            selectedTokenExchangeRate={2}
+            showFiat
+          />
+        </Provider>
+      )
+
+      assert.ok(wrapper)
+      const tokenInputInstance = wrapper.find(TokenInput).at(0).instance()
+      assert.equal(tokenInputInstance.state.decimalValue, 1)
+      assert.equal(tokenInputInstance.state.hexValue, '2710')
+      assert.equal(wrapper.find('.unit-input__suffix').length, 1)
+      assert.equal(wrapper.find('.unit-input__suffix').text(), 'ABC')
+      assert.equal(wrapper.find('.unit-input__input').props().value, '1')
+      assert.equal(wrapper.find('.currency-display-component').text(), '$462.12 USD')
+    })
+  })
+
+  describe('handling actions', () => {
+    const handleChangeSpy = sinon.spy()
+    const handleBlurSpy = sinon.spy()
+
+    afterEach(() => {
+      handleChangeSpy.resetHistory()
+      handleBlurSpy.resetHistory()
+    })
+
+    it('should call onChange and onBlur on input changes with the hex value for ETH', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+      const wrapper = mount(
+        <Provider store={store}>
+          <TokenInput
+            onChange={handleChangeSpy}
+            onBlur={handleBlurSpy}
+            selectedToken={{
+              address: '0x1',
+              decimals: '4',
+              symbol: 'ABC',
+            }}
+            suffix="ABC"
+            selectedTokenExchangeRate={2}
+          />
+        </Provider>
+      )
+
+      assert.ok(wrapper)
+      assert.equal(handleChangeSpy.callCount, 0)
+      assert.equal(handleBlurSpy.callCount, 0)
+
+      const tokenInputInstance = wrapper.find(TokenInput).at(0).instance()
+      assert.equal(tokenInputInstance.state.decimalValue, 0)
+      assert.equal(tokenInputInstance.state.hexValue, undefined)
+      assert.equal(wrapper.find('.currency-display-component').text(), '0 ETH')
+      const input = wrapper.find('input')
+      assert.equal(input.props().value, 0)
+
+      input.simulate('change', { target: { value: 1 } })
+      assert.equal(handleChangeSpy.callCount, 1)
+      assert.ok(handleChangeSpy.calledWith('2710'))
+      assert.equal(wrapper.find('.currency-display-component').text(), '2 ETH')
+      assert.equal(tokenInputInstance.state.decimalValue, 1)
+      assert.equal(tokenInputInstance.state.hexValue, '2710')
+
+      assert.equal(handleBlurSpy.callCount, 0)
+      input.simulate('blur')
+      assert.equal(handleBlurSpy.callCount, 1)
+      assert.ok(handleBlurSpy.calledWith('2710'))
+    })
+
+    it('should call onChange and onBlur on input changes with the hex value for fiat', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+      const wrapper = mount(
+        <Provider store={store}>
+          <TokenInput
+            onChange={handleChangeSpy}
+            onBlur={handleBlurSpy}
+            selectedToken={{
+              address: '0x1',
+              decimals: '4',
+              symbol: 'ABC',
+            }}
+            suffix="ABC"
+            selectedTokenExchangeRate={2}
+            showFiat
+          />
+        </Provider>
+      )
+
+      assert.ok(wrapper)
+      assert.equal(handleChangeSpy.callCount, 0)
+      assert.equal(handleBlurSpy.callCount, 0)
+
+      const tokenInputInstance = wrapper.find(TokenInput).at(0).instance()
+      assert.equal(tokenInputInstance.state.decimalValue, 0)
+      assert.equal(tokenInputInstance.state.hexValue, undefined)
+      assert.equal(wrapper.find('.currency-display-component').text(), '$0.00 USD')
+      const input = wrapper.find('input')
+      assert.equal(input.props().value, 0)
+
+      input.simulate('change', { target: { value: 1 } })
+      assert.equal(handleChangeSpy.callCount, 1)
+      assert.ok(handleChangeSpy.calledWith('2710'))
+      assert.equal(wrapper.find('.currency-display-component').text(), '$462.12 USD')
+      assert.equal(tokenInputInstance.state.decimalValue, 1)
+      assert.equal(tokenInputInstance.state.hexValue, '2710')
+
+      assert.equal(handleBlurSpy.callCount, 0)
+      input.simulate('blur')
+      assert.equal(handleBlurSpy.callCount, 1)
+      assert.ok(handleBlurSpy.calledWith('2710'))
+    })
+
+    it('should change the state and pass in a new decimalValue when props.value changes', () => {
+      const mockStore = {
+        metamask: {
+          currentCurrency: 'usd',
+          conversionRate: 231.06,
+        },
+      }
+      const store = configureMockStore()(mockStore)
+      const wrapper = shallow(
+        <Provider store={store}>
+          <TokenInput
+            onChange={handleChangeSpy}
+            onBlur={handleBlurSpy}
+            selectedToken={{
+              address: '0x1',
+              decimals: '4',
+              symbol: 'ABC',
+            }}
+            suffix="ABC"
+            selectedTokenExchangeRate={2}
+            showFiat
+          />
+        </Provider>
+      )
+
+      assert.ok(wrapper)
+      const tokenInputInstance = wrapper.find(TokenInput).dive()
+      assert.equal(tokenInputInstance.state('decimalValue'), 0)
+      assert.equal(tokenInputInstance.state('hexValue'), undefined)
+      assert.equal(tokenInputInstance.find(UnitInput).props().value, 0)
+
+      tokenInputInstance.setProps({ value: '2710' })
+      tokenInputInstance.update()
+      assert.equal(tokenInputInstance.state('decimalValue'), 1)
+      assert.equal(tokenInputInstance.state('hexValue'), '2710')
+      assert.equal(tokenInputInstance.find(UnitInput).props().value, 1)
+    })
+  })
+})

ui/app/components/token-input/tests/token-input.container.test.js

@@ -0,0 +1,129 @@
+import assert from 'assert'
+import proxyquire from 'proxyquire'
+
+let mapStateToProps, mergeProps
+
+proxyquire('../token-input.container.js', {
+  'react-redux': {
+    connect: (ms, md, mp) => {
+      mapStateToProps = ms
+      mergeProps = mp
+      return () => ({})
+    },
+  },
+})
+
+describe('TokenInput container', () => {
+  describe('mapStateToProps()', () => {
+    it('should return the correct props when send is empty', () => {
+      const mockState = {
+        metamask: {
+          currentCurrency: 'usd',
+          tokens: [
+            {
+              address: '0x1',
+              decimals: '4',
+              symbol: 'ABC',
+            },
+          ],
+          selectedTokenAddress: '0x1',
+          contractExchangeRates: {},
+          send: {},
+        },
+      }
+
+      assert.deepEqual(mapStateToProps(mockState), {
+        currentCurrency: 'usd',
+        selectedToken: {
+          address: '0x1',
+          decimals: '4',
+          symbol: 'ABC',
+        },
+        selectedTokenExchangeRate: 0,
+      })
+    })
+
+    it('should return the correct props when selectedTokenAddress is not found and send is populated', () => {
+      const mockState = {
+        metamask: {
+          currentCurrency: 'usd',
+          tokens: [
+            {
+              address: '0x1',
+              decimals: '4',
+              symbol: 'ABC',
+            },
+          ],
+          selectedTokenAddress: '0x2',
+          contractExchangeRates: {},
+          send: {
+            token: { address: 'test' },
+          },
+        },
+      }
+
+      assert.deepEqual(mapStateToProps(mockState), {
+        currentCurrency: 'usd',
+        selectedToken: {
+          address: 'test',
+        },
+        selectedTokenExchangeRate: 0,
+      })
+    })
+
+    it('should return the correct props when contractExchangeRates is populated', () => {
+      const mockState = {
+        metamask: {
+          currentCurrency: 'usd',
+          tokens: [
+            {
+              address: '0x1',
+              decimals: '4',
+              symbol: 'ABC',
+            },
+          ],
+          selectedTokenAddress: '0x1',
+          contractExchangeRates: {
+            '0x1': 5,
+          },
+          send: {},
+        },
+      }
+
+      assert.deepEqual(mapStateToProps(mockState), {
+        currentCurrency: 'usd',
+        selectedToken: {
+          address: '0x1',
+          decimals: '4',
+          symbol: 'ABC',
+        },
+        selectedTokenExchangeRate: 5,
+      })
+    })
+  })
+
+  describe('mergeProps()', () => {
+    it('should return the correct props', () => {
+      const mockStateProps = {
+        currentCurrency: 'usd',
+        selectedToken: {
+          address: '0x1',
+          decimals: '4',
+          symbol: 'ABC',
+        },
+        selectedTokenExchangeRate: 5,
+      }
+
+      assert.deepEqual(mergeProps(mockStateProps, {}, {}), {
+        currentCurrency: 'usd',
+        selectedToken: {
+          address: '0x1',
+          decimals: '4',
+          symbol: 'ABC',
+        },
+        selectedTokenExchangeRate: 5,
+        suffix: 'ABC',
+      })
+    })
+  })
+})

ui/app/components/token-input/token-input.component.js

@@ -0,0 +1,136 @@
+import React, { PureComponent } from 'react'
+import PropTypes from 'prop-types'
+import UnitInput from '../unit-input'
+import CurrencyDisplay from '../currency-display'
+import { getWeiHexFromDecimalValue } from '../../helpers/conversions.util'
+import ethUtil from 'ethereumjs-util'
+import { conversionUtil, multiplyCurrencies } from '../../conversion-util'
+import { ETH } from '../../constants/common'
+
+/**
+ * Component that allows user to enter token values as a number, and props receive a converted
+ * hex value. props.value, used as a default or forced value, should be a hex value, which
+ * gets converted into a decimal value.
+ */
+export default class TokenInput extends PureComponent {
+  static contextTypes = {
+    t: PropTypes.func,
+  }
+
+  static propTypes = {
+    currentCurrency: PropTypes.string,
+    onChange: PropTypes.func,
+    onBlur: PropTypes.func,
+    value: PropTypes.string,
+    suffix: PropTypes.string,
+    showFiat: PropTypes.bool,
+    selectedToken: PropTypes.object,
+    selectedTokenExchangeRate: PropTypes.number,
+  }
+
+  constructor (props) {
+    super(props)
+
+    const { value: hexValue } = props
+    const decimalValue = hexValue ? this.getDecimalValue(props) : 0
+
+    this.state = {
+      decimalValue,
+      hexValue,
+    }
+  }
+
+  componentDidUpdate (prevProps) {
+    const { value: prevPropsHexValue } = prevProps
+    const { value: propsHexValue } = this.props
+    const { hexValue: stateHexValue } = this.state
+
+    if (prevPropsHexValue !== propsHexValue && propsHexValue !== stateHexValue) {
+      const decimalValue = this.getDecimalValue(this.props)
+      this.setState({ hexValue: propsHexValue, decimalValue })
+    }
+  }
+
+  getDecimalValue (props) {
+    const { value: hexValue, selectedToken: { decimals, symbol } = {} } = props
+
+    const multiplier = Math.pow(10, Number(decimals || 0))
+    const decimalValueString = conversionUtil(ethUtil.addHexPrefix(hexValue), {
+      fromNumericBase: 'hex',
+      toNumericBase: 'dec',
+      toCurrency: symbol,
+      conversionRate: multiplier,
+      invertConversionRate: true,
+    })
+
+    return Number(decimalValueString) || 0
+  }
+
+  handleChange = decimalValue => {
+    const { selectedToken: { decimals } = {}, onChange } = this.props
+
+    const multiplier = Math.pow(10, Number(decimals || 0))
+    const hexValue = multiplyCurrencies(decimalValue || 0, multiplier, { toNumericBase: 'hex' })
+
+    this.setState({ hexValue, decimalValue })
+    onChange(hexValue)
+  }
+
+  handleBlur = () => {
+    this.props.onBlur(this.state.hexValue)
+  }
+
+  renderConversionComponent () {
+    const { selectedTokenExchangeRate, showFiat, currentCurrency } = this.props
+    const { decimalValue } = this.state
+    let currency, numberOfDecimals
+
+    if (showFiat) {
+      // Display Fiat
+      currency = currentCurrency
+      numberOfDecimals = 2
+    } else {
+      // Display ETH
+      currency = ETH
+      numberOfDecimals = 6
+    }
+
+    const decimalEthValue = (decimalValue * selectedTokenExchangeRate) || 0
+    const hexWeiValue = getWeiHexFromDecimalValue({
+      value: decimalEthValue,
+      fromCurrency: ETH,
+      fromDenomination: ETH,
+    })
+
+    return selectedTokenExchangeRate
+      ? (
+        <CurrencyDisplay
+          className="currency-input__conversion-component"
+          currency={currency}
+          value={hexWeiValue}
+          numberOfDecimals={numberOfDecimals}
+        />
+      ) : (
+        <div className="currency-input__conversion-component">
+          { this.context.t('noConversionRateAvailable') }
+        </div>
+      )
+  }
+
+  render () {
+    const { suffix, ...restProps } = this.props
+    const { decimalValue } = this.state
+
+    return (
+      <UnitInput
+        {...restProps}
+        suffix={suffix}
+        onChange={this.handleChange}
+        onBlur={this.handleBlur}
+        value={decimalValue}
+      >
+        { this.renderConversionComponent() }
+      </UnitInput>
+    )
+  }
+}

ui/app/components/token-input/token-input.container.js

@@ -0,0 +1,27 @@
+import { connect } from 'react-redux'
+import TokenInput from './token-input.component'
+import { getSelectedToken, getSelectedTokenExchangeRate } from '../../selectors'
+
+const mapStateToProps = state => {
+  const { metamask: { currentCurrency } } = state
+
+  return {
+    currentCurrency,
+    selectedToken: getSelectedToken(state),
+    selectedTokenExchangeRate: getSelectedTokenExchangeRate(state),
+  }
+}
+
+const mergeProps = (stateProps, dispatchProps, ownProps) => {
+  const { selectedToken } = stateProps
+  const suffix = selectedToken && selectedToken.symbol
+
+  return {
+    ...stateProps,
+    ...dispatchProps,
+    ...ownProps,
+    suffix,
+  }
+}
+
+export default connect(mapStateToProps, null, mergeProps)(TokenInput)

ui/app/components/transaction-breakdown/transaction-breakdown.component.js

@@ -4,8 +4,9 @@ import classnames from 'classnames'
 import TransactionBreakdownRow from './transaction-breakdown-row'
 import Card from '../card'
 import CurrencyDisplay from '../currency-display'
+import UserPreferencedCurrencyDisplay from '../user-preferenced-currency-display'
 import HexToDecimal from '../hex-to-decimal'
-import { ETH, GWEI } from '../../constants/common'
+import { ETH, GWEI, PRIMARY, SECONDARY } from '../../constants/common'
 import { getHexGasTotal } from '../../helpers/confirm-transaction/util'
 import { sumHexes } from '../../helpers/transactions.util'
 
@@ -40,9 +41,9 @@ export default class TransactionBreakdown extends PureComponent {
           className="transaction-breakdown__card"
         >
           <TransactionBreakdownRow title={t('amount')}>
-            <CurrencyDisplay
+            <UserPreferencedCurrencyDisplay
               className="transaction-breakdown__value"
-              currency={ETH}
+              type={PRIMARY}
               value={value}
             />
           </TransactionBreakdownRow>
@@ -79,14 +80,14 @@ export default class TransactionBreakdown extends PureComponent {
           </TransactionBreakdownRow>
           <TransactionBreakdownRow title={t('total')}>
             <div>
-              <CurrencyDisplay
+              <UserPreferencedCurrencyDisplay
                 className="transaction-breakdown__value transaction-breakdown__value--eth-total"
-                currency={ETH}
+                type={PRIMARY}
                 value={totalInHex}
-                numberOfDecimals={6}
               />
-              <CurrencyDisplay
+              <UserPreferencedCurrencyDisplay
                 className="transaction-breakdown__value"
+                type={SECONDARY}
                 value={totalInHex}
               />
             </div>

ui/app/components/transaction-list-item/transaction-list-item.component.js

@@ -4,12 +4,12 @@ import classnames from 'classnames'
 import Identicon from '../identicon'
 import TransactionStatus from '../transaction-status'
 import TransactionAction from '../transaction-action'
-import CurrencyDisplay from '../currency-display'
+import UserPreferencedCurrencyDisplay from '../user-preferenced-currency-display'
 import TokenCurrencyDisplay from '../token-currency-display'
 import TransactionListItemDetails from '../transaction-list-item-details'
 import { CONFIRM_TRANSACTION_ROUTE } from '../../routes'
 import { UNAPPROVED_STATUS, TOKEN_METHOD_TRANSFER } from '../../constants/transactions'
-import { ETH } from '../../constants/common'
+import { PRIMARY, SECONDARY } from '../../constants/common'
 import { ENVIRONMENT_TYPE_FULLSCREEN } from '../../../../app/scripts/lib/enums'
 import { getStatusKey } from '../../helpers/transactions.util'
 
@@ -103,12 +103,11 @@ export default class TransactionListItem extends PureComponent {
           prefix="-"
         />
       ) : (
-        <CurrencyDisplay
+        <UserPreferencedCurrencyDisplay
           className="transaction-list-item__amount transaction-list-item__amount--primary"
           value={value}
+          type={PRIMARY}
           prefix="-"
-          numberOfDecimals={2}
-          currency={ETH}
         />
       )
   }
@@ -119,10 +118,11 @@ export default class TransactionListItem extends PureComponent {
     return token
       ? null
       : (
-        <CurrencyDisplay
+        <UserPreferencedCurrencyDisplay
           className="transaction-list-item__amount transaction-list-item__amount--secondary"
-          prefix="-"
           value={value}
+          prefix="-"
+          type={SECONDARY}
         />
       )
   }

ui/app/components/transaction-view-balance/tests/token-view-balance.component.test.js

@@ -3,7 +3,7 @@ import assert from 'assert'
 import { shallow } from 'enzyme'
 import sinon from 'sinon'
 import TokenBalance from '../../token-balance'
-import CurrencyDisplay from '../../currency-display'
+import UserPreferencedCurrencyDisplay from '../../user-preferenced-currency-display'
 import { SEND_ROUTE } from '../../../routes'
 import TransactionViewBalance from '../transaction-view-balance.component'
 
@@ -35,7 +35,7 @@ describe('TransactionViewBalance Component', () => {
 
     assert.equal(wrapper.find('.transaction-view-balance').length, 1)
     assert.equal(wrapper.find('.transaction-view-balance__button').length, 2)
-    assert.equal(wrapper.find(CurrencyDisplay).length, 2)
+    assert.equal(wrapper.find(UserPreferencedCurrencyDisplay).length, 2)
 
     const buttons = wrapper.find('.transaction-view-balance__buttons')
     assert.equal(propsMethodSpies.showDepositModal.callCount, 0)

ui/app/components/transaction-view-balance/transaction-view-balance.component.js

@@ -3,9 +3,9 @@ import PropTypes from 'prop-types'
 import Button from '../button'
 import Identicon from '../identicon'
 import TokenBalance from '../token-balance'
-import CurrencyDisplay from '../currency-display'
+import UserPreferencedCurrencyDisplay from '../user-preferenced-currency-display'
 import { SEND_ROUTE } from '../../routes'
-import { ETH } from '../../constants/common'
+import { PRIMARY, SECONDARY } from '../../constants/common'
 
 export default class TransactionViewBalance extends PureComponent {
   static contextTypes = {
@@ -33,15 +33,17 @@ export default class TransactionViewBalance extends PureComponent {
         />
       ) : (
         <div className="transaction-view-balance__balance">
-          <CurrencyDisplay
+          <UserPreferencedCurrencyDisplay
             className="transaction-view-balance__primary-balance"
             value={balance}
-            currency={ETH}
+            type={PRIMARY}
-            numberOfDecimals={3}
+            ethNumberOfDecimals={3}
           />
-          <CurrencyDisplay
+          <UserPreferencedCurrencyDisplay
             className="transaction-view-balance__secondary-balance"
             value={balance}
+            type={SECONDARY}
+            ethNumberOfDecimals={3}
           />
         </div>
       )

ui/app/components/unit-input/index.js

@@ -0,0 +1 @@
+export { default } from './unit-input.component'

ui/app/components/unit-input/index.scss

@@ -0,0 +1,44 @@
+.unit-input {
+  min-height: 54px;
+  border: 1px solid #dedede;
+  border-radius: 4px;
+  background-color: #fff;
+  color: #4d4d4d;
+  font-size: 1rem;
+  padding: 8px 10px;
+  position: relative;
+
+  input[type="number"] {
+    -moz-appearance: textfield;
+  }
+
+  input[type="number"]::-webkit-inner-spin-button {
+    -webkit-appearance: none;
+    -moz-appearance: none;
+    display: none;
+  }
+
+  input[type="number"]:hover::-webkit-inner-spin-button {
+    -webkit-appearance: none;
+    -moz-appearance: none;
+    display: none;
+  }
+
+  &__input {
+    color: #4d4d4d;
+    font-size: 1rem;
+    font-family: Roboto;
+    border: none;
+    outline: 0 !important;
+    max-width: 22ch;
+  }
+
+  &__input-container {
+    display: flex;
+    align-items: center;
+  }
+
+  &--error {
+    border-color: $red;
+  }
+}

ui/app/components/unit-input/tests/unit-input.component.test.js

@@ -0,0 +1,146 @@
+import React from 'react'
+import assert from 'assert'
+import { shallow, mount } from 'enzyme'
+import sinon from 'sinon'
+import UnitInput from '../unit-input.component'
+
+describe('UnitInput Component', () => {
+  describe('rendering', () => {
+    it('should render properly without a suffix', () => {
+      const wrapper = shallow(
+        <UnitInput />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find('.unit-input__suffix').length, 0)
+    })
+
+    it('should render properly with a suffix', () => {
+      const wrapper = shallow(
+        <UnitInput
+          suffix="ETH"
+        />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find('.unit-input__suffix').length, 1)
+      assert.equal(wrapper.find('.unit-input__suffix').text(), 'ETH')
+    })
+
+    it('should render properly with a child omponent', () => {
+      const wrapper = shallow(
+        <UnitInput>
+          <div className="testing">
+            TESTCOMPONENT
+          </div>
+        </UnitInput>
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find('.testing').length, 1)
+      assert.equal(wrapper.find('.testing').text(), 'TESTCOMPONENT')
+    })
+
+    it('should render with an error class when props.error === true', () => {
+      const wrapper = shallow(
+        <UnitInput
+          error
+        />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find('.unit-input--error').length, 1)
+    })
+  })
+
+  describe('handling actions', () => {
+    const handleChangeSpy = sinon.spy()
+    const handleBlurSpy = sinon.spy()
+
+    afterEach(() => {
+      handleChangeSpy.resetHistory()
+      handleBlurSpy.resetHistory()
+    })
+
+    it('should focus the input on component click', () => {
+      const wrapper = mount(
+        <UnitInput />
+      )
+
+      assert.ok(wrapper)
+      const handleFocusSpy = sinon.spy(wrapper.instance(), 'handleFocus')
+      wrapper.instance().forceUpdate()
+      wrapper.update()
+      assert.equal(handleFocusSpy.callCount, 0)
+      wrapper.find('.unit-input').simulate('click')
+      assert.equal(handleFocusSpy.callCount, 1)
+    })
+
+    it('should call onChange on input changes with the value', () => {
+      const wrapper = mount(
+        <UnitInput
+          onChange={handleChangeSpy}
+        />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(handleChangeSpy.callCount, 0)
+      const input = wrapper.find('input')
+      input.simulate('change', { target: { value: 123 } })
+      assert.equal(handleChangeSpy.callCount, 1)
+      assert.ok(handleChangeSpy.calledWith(123))
+      assert.equal(wrapper.state('value'), 123)
+    })
+
+    it('should call onBlur on blur with the value', () => {
+      const wrapper = mount(
+        <UnitInput
+          onChange={handleChangeSpy}
+          onBlur={handleBlurSpy}
+        />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(handleChangeSpy.callCount, 0)
+      assert.equal(handleBlurSpy.callCount, 0)
+      const input = wrapper.find('input')
+      input.simulate('change', { target: { value: 123 } })
+      assert.equal(handleChangeSpy.callCount, 1)
+      assert.ok(handleChangeSpy.calledWith(123))
+      assert.equal(wrapper.state('value'), 123)
+      input.simulate('blur')
+      assert.equal(handleBlurSpy.callCount, 1)
+      assert.ok(handleBlurSpy.calledWith(123))
+    })
+
+    it('should set the component state value with props.value', () => {
+      const wrapper = mount(
+        <UnitInput
+          value={123}
+        />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.state('value'), 123)
+    })
+
+    it('should update the component state value with props.value', () => {
+      const wrapper = mount(
+        <UnitInput
+          onChange={handleChangeSpy}
+        />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(handleChangeSpy.callCount, 0)
+      const input = wrapper.find('input')
+      input.simulate('change', { target: { value: 123 } })
+      assert.equal(wrapper.state('value'), 123)
+      assert.equal(handleChangeSpy.callCount, 1)
+      assert.ok(handleChangeSpy.calledWith(123))
+      wrapper.setProps({ value: 456 })
+      assert.equal(wrapper.state('value'), 456)
+      assert.equal(handleChangeSpy.callCount, 1)
+    })
+  })
+})

ui/app/components/unit-input/unit-input.component.js

@@ -0,0 +1,104 @@
+import React, { PureComponent } from 'react'
+import PropTypes from 'prop-types'
+import classnames from 'classnames'
+import { removeLeadingZeroes } from '../send/send.utils'
+
+/**
+ * Component that attaches a suffix or unit of measurement trailing user input, ex. 'ETH'. Also
+ * allows rendering a child component underneath the input to, for example, display conversions of
+ * the shown suffix.
+ */
+export default class UnitInput extends PureComponent {
+  static propTypes = {
+    children: PropTypes.node,
+    error: PropTypes.bool,
+    onBlur: PropTypes.func,
+    onChange: PropTypes.func,
+    placeholder: PropTypes.string,
+    suffix: PropTypes.string,
+    value: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
+  }
+
+  static defaultProps = {
+    placeholder: '0',
+  }
+
+  constructor (props) {
+    super(props)
+
+    this.state = {
+      value: props.value || '',
+    }
+  }
+
+  componentDidUpdate (prevProps) {
+    const { value: prevPropsValue } = prevProps
+    const { value: propsValue } = this.props
+    const { value: stateValue } = this.state
+
+    if (prevPropsValue !== propsValue && propsValue !== stateValue) {
+      this.setState({ value: propsValue })
+    }
+  }
+
+  handleFocus = () => {
+    this.unitInput.focus()
+  }
+
+  handleChange = event => {
+    const { value: userInput } = event.target
+    let value = userInput
+
+    if (userInput.length && userInput.length > 1) {
+      value = removeLeadingZeroes(userInput)
+    }
+
+    this.setState({ value })
+    this.props.onChange(value)
+  }
+
+  handleBlur = event => {
+    const { onBlur } = this.props
+    typeof onBlur === 'function' && onBlur(this.state.value)
+  }
+
+  getInputWidth (value) {
+    const valueString = String(value)
+    const valueLength = valueString.length || 1
+    const decimalPointDeficit = valueString.match(/\./) ? -0.5 : 0
+    return (valueLength + decimalPointDeficit + 0.75) + 'ch'
+  }
+
+  render () {
+    const { error, placeholder, suffix, children } = this.props
+    const { value } = this.state
+
+    return (
+      <div
+        className={classnames('unit-input', { 'unit-input--error': error })}
+        onClick={this.handleFocus}
+      >
+        <div className="unit-input__input-container">
+          <input
+            type="number"
+            className="unit-input__input"
+            value={value}
+            placeholder={placeholder}
+            onChange={this.handleChange}
+            onBlur={this.handleBlur}
+            style={{ width: this.getInputWidth(value) }}
+            ref={ref => { this.unitInput = ref }}
+          />
+          {
+            suffix && (
+              <div className="unit-input__suffix">
+                { suffix }
+              </div>
+            )
+          }
+        </div>
+        { children }
+      </div>
+    )
+  }
+}

ui/app/components/user-preferenced-currency-display/index.js

@@ -0,0 +1 @@
+export { default } from './user-preferenced-currency-display.container'

ui/app/components/user-preferenced-currency-display/tests/user-preferenced-currency-display.component.test.js

@@ -0,0 +1,34 @@
+import React from 'react'
+import assert from 'assert'
+import { shallow } from 'enzyme'
+import UserPreferencedCurrencyDisplay from '../user-preferenced-currency-display.component'
+import CurrencyDisplay from '../../currency-display'
+
+describe('UserPreferencedCurrencyDisplay Component', () => {
+  describe('rendering', () => {
+    it('should render properly', () => {
+      const wrapper = shallow(
+        <UserPreferencedCurrencyDisplay />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find(CurrencyDisplay).length, 1)
+    })
+
+    it('should pass all props to the CurrencyDisplay child component', () => {
+      const wrapper = shallow(
+        <UserPreferencedCurrencyDisplay
+          prop1={true}
+          prop2="test"
+          prop3={1}
+        />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find(CurrencyDisplay).length, 1)
+      assert.equal(wrapper.find(CurrencyDisplay).props().prop1, true)
+      assert.equal(wrapper.find(CurrencyDisplay).props().prop2, 'test')
+      assert.equal(wrapper.find(CurrencyDisplay).props().prop3, 1)
+    })
+  })
+})

ui/app/components/user-preferenced-currency-display/tests/user-preferenced-currency-display.container.test.js

@@ -0,0 +1,105 @@
+import assert from 'assert'
+import proxyquire from 'proxyquire'
+
+let mapStateToProps, mergeProps
+
+proxyquire('../user-preferenced-currency-display.container.js', {
+  'react-redux': {
+    connect: (ms, md, mp) => {
+      mapStateToProps = ms
+      mergeProps = mp
+      return () => ({})
+    },
+  },
+})
+
+describe('UserPreferencedCurrencyDisplay container', () => {
+  describe('mapStateToProps()', () => {
+    it('should return the correct props', () => {
+      const mockState = {
+        metamask: {
+          preferences: {
+            useETHAsPrimaryCurrency: true,
+          },
+        },
+      }
+
+      assert.deepEqual(mapStateToProps(mockState), {
+        useETHAsPrimaryCurrency: true,
+      })
+    })
+  })
+
+  describe('mergeProps()', () => {
+    it('should return the correct props', () => {
+      const mockDispatchProps = {}
+
+      const tests = [
+        {
+          stateProps: {
+            useETHAsPrimaryCurrency: true,
+          },
+          ownProps: {
+            type: 'PRIMARY',
+          },
+          result: {
+            currency: 'ETH',
+            numberOfDecimals: 6,
+            prefix: undefined,
+          },
+        },
+        {
+          stateProps: {
+            useETHAsPrimaryCurrency: false,
+          },
+          ownProps: {
+            type: 'PRIMARY',
+          },
+          result: {
+            currency: undefined,
+            numberOfDecimals: 2,
+            prefix: undefined,
+          },
+        },
+        {
+          stateProps: {
+            useETHAsPrimaryCurrency: true,
+          },
+          ownProps: {
+            type: 'SECONDARY',
+            fiatNumberOfDecimals: 4,
+            fiatPrefix: '-',
+          },
+          result: {
+            currency: undefined,
+            numberOfDecimals: 4,
+            prefix: '-',
+          },
+        },
+        {
+          stateProps: {
+            useETHAsPrimaryCurrency: false,
+          },
+          ownProps: {
+            type: 'SECONDARY',
+            fiatNumberOfDecimals: 4,
+            numberOfDecimals: 3,
+            fiatPrefix: 'a',
+            prefix: 'b',
+          },
+          result: {
+            currency: 'ETH',
+            numberOfDecimals: 3,
+            prefix: 'b',
+          },
+        },
+      ]
+
+      tests.forEach(({ stateProps, ownProps, result }) => {
+        assert.deepEqual(mergeProps({ ...stateProps }, mockDispatchProps, { ...ownProps }), {
+          ...result,
+        })
+      })
+    })
+  })
+})

ui/app/components/user-preferenced-currency-display/user-preferenced-currency-display.component.js

@@ -0,0 +1,45 @@
+import React, { PureComponent } from 'react'
+import PropTypes from 'prop-types'
+import { PRIMARY, SECONDARY, ETH } from '../../constants/common'
+import CurrencyDisplay from '../currency-display'
+
+export default class UserPreferencedCurrencyDisplay extends PureComponent {
+  static propTypes = {
+    className: PropTypes.string,
+    prefix: PropTypes.string,
+    value: PropTypes.string,
+    numberOfDecimals: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
+    hideLabel: PropTypes.bool,
+    style: PropTypes.object,
+    showEthLogo: PropTypes.bool,
+    ethLogoHeight: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
+    // Used in container
+    type: PropTypes.oneOf([PRIMARY, SECONDARY]),
+    ethNumberOfDecimals: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
+    fiatNumberOfDecimals: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
+    ethPrefix: PropTypes.string,
+    fiatPrefix: PropTypes.string,
+    // From container
+    currency: PropTypes.string,
+  }
+
+  renderEthLogo () {
+    const { currency, showEthLogo, ethLogoHeight = 12 } = this.props
+
+    return currency === ETH && showEthLogo && (
+      <img
+        src="/images/eth.svg"
+        height={ethLogoHeight}
+      />
+    )
+  }
+
+  render () {
+    return (
+      <CurrencyDisplay
+        {...this.props}
+        prefixComponent={this.renderEthLogo()}
+      />
+    )
+  }
+}

ui/app/components/user-preferenced-currency-display/user-preferenced-currency-display.container.js

@@ -0,0 +1,52 @@
+import { connect } from 'react-redux'
+import UserPreferencedCurrencyDisplay from './user-preferenced-currency-display.component'
+import { preferencesSelector } from '../../selectors'
+import { ETH, PRIMARY, SECONDARY } from '../../constants/common'
+
+const mapStateToProps = (state, ownProps) => {
+  const { useETHAsPrimaryCurrency } = preferencesSelector(state)
+
+  return {
+    useETHAsPrimaryCurrency,
+  }
+}
+
+const mergeProps = (stateProps, dispatchProps, ownProps) => {
+  const { useETHAsPrimaryCurrency, ...restStateProps } = stateProps
+  const {
+    type,
+    numberOfDecimals: propsNumberOfDecimals,
+    ethNumberOfDecimals,
+    fiatNumberOfDecimals,
+    ethPrefix,
+    fiatPrefix,
+    prefix: propsPrefix,
+    ...restOwnProps
+  } = ownProps
+
+  let currency, numberOfDecimals, prefix
+
+  if (type === PRIMARY && useETHAsPrimaryCurrency ||
+    type === SECONDARY && !useETHAsPrimaryCurrency) {
+    // Display ETH
+    currency = ETH
+    numberOfDecimals = propsNumberOfDecimals || ethNumberOfDecimals || 6
+    prefix = propsPrefix || ethPrefix
+  } else if (type === SECONDARY && useETHAsPrimaryCurrency ||
+    type === PRIMARY && !useETHAsPrimaryCurrency) {
+    // Display Fiat
+    numberOfDecimals = propsNumberOfDecimals || fiatNumberOfDecimals || 2
+    prefix = propsPrefix || fiatPrefix
+  }
+
+  return {
+    ...restStateProps,
+    ...dispatchProps,
+    ...restOwnProps,
+    currency,
+    numberOfDecimals,
+    prefix,
+  }
+}
+
+export default connect(mapStateToProps, null, mergeProps)(UserPreferencedCurrencyDisplay)

ui/app/components/user-preferenced-currency-input/index.js

@@ -0,0 +1 @@
+export { default } from './user-preferenced-currency-input.container'

ui/app/components/user-preferenced-currency-input/tests/user-preferenced-currency-input.component.test.js

@@ -0,0 +1,32 @@
+import React from 'react'
+import assert from 'assert'
+import { shallow } from 'enzyme'
+import UserPreferencedCurrencyInput from '../user-preferenced-currency-input.component'
+import CurrencyInput from '../../currency-input'
+
+describe('UserPreferencedCurrencyInput Component', () => {
+  describe('rendering', () => {
+    it('should render properly', () => {
+      const wrapper = shallow(
+        <UserPreferencedCurrencyInput />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find(CurrencyInput).length, 1)
+    })
+
+    it('should render useFiat for CurrencyInput based on preferences.useETHAsPrimaryCurrency', () => {
+      const wrapper = shallow(
+        <UserPreferencedCurrencyInput
+          useETHAsPrimaryCurrency
+        />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find(CurrencyInput).length, 1)
+      assert.equal(wrapper.find(CurrencyInput).props().useFiat, false)
+      wrapper.setProps({ useETHAsPrimaryCurrency: false })
+      assert.equal(wrapper.find(CurrencyInput).props().useFiat, true)
+    })
+  })
+})

ui/app/components/user-preferenced-currency-input/tests/user-preferenced-currency-input.container.test.js

@@ -0,0 +1,31 @@
+import assert from 'assert'
+import proxyquire from 'proxyquire'
+
+let mapStateToProps
+
+proxyquire('../user-preferenced-currency-input.container.js', {
+  'react-redux': {
+    connect: ms => {
+      mapStateToProps = ms
+      return () => ({})
+    },
+  },
+})
+
+describe('UserPreferencedCurrencyInput container', () => {
+  describe('mapStateToProps()', () => {
+    it('should return the correct props', () => {
+      const mockState = {
+        metamask: {
+          preferences: {
+            useETHAsPrimaryCurrency: true,
+          },
+        },
+      }
+
+      assert.deepEqual(mapStateToProps(mockState), {
+        useETHAsPrimaryCurrency: true,
+      })
+    })
+  })
+})

ui/app/components/user-preferenced-currency-input/user-preferenced-currency-input.component.js

@@ -0,0 +1,20 @@
+import React, { PureComponent } from 'react'
+import PropTypes from 'prop-types'
+import CurrencyInput from '../currency-input'
+
+export default class UserPreferencedCurrencyInput extends PureComponent {
+  static propTypes = {
+    useETHAsPrimaryCurrency: PropTypes.bool,
+  }
+
+  render () {
+    const { useETHAsPrimaryCurrency, ...restProps } = this.props
+
+    return (
+      <CurrencyInput
+        {...restProps}
+        useFiat={!useETHAsPrimaryCurrency}
+      />
+    )
+  }
+}

ui/app/components/user-preferenced-currency-input/user-preferenced-currency-input.container.js

@@ -0,0 +1,13 @@
+import { connect } from 'react-redux'
+import UserPreferencedCurrencyInput from './user-preferenced-currency-input.component'
+import { preferencesSelector } from '../../selectors'
+
+const mapStateToProps = state => {
+  const { useETHAsPrimaryCurrency } = preferencesSelector(state)
+
+  return {
+    useETHAsPrimaryCurrency,
+  }
+}
+
+export default connect(mapStateToProps)(UserPreferencedCurrencyInput)

ui/app/components/user-preferenced-token-input/index.js

@@ -0,0 +1 @@
+export { default } from './user-preferenced-token-input.container'

ui/app/components/user-preferenced-token-input/tests/user-preferenced-token-input.component.test.js

@@ -0,0 +1,32 @@
+import React from 'react'
+import assert from 'assert'
+import { shallow } from 'enzyme'
+import UserPreferencedTokenInput from '../user-preferenced-token-input.component'
+import TokenInput from '../../token-input'
+
+describe('UserPreferencedCurrencyInput Component', () => {
+  describe('rendering', () => {
+    it('should render properly', () => {
+      const wrapper = shallow(
+        <UserPreferencedTokenInput />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find(TokenInput).length, 1)
+    })
+
+    it('should render showFiat for TokenInput based on preferences.useETHAsPrimaryCurrency', () => {
+      const wrapper = shallow(
+        <UserPreferencedTokenInput
+          useETHAsPrimaryCurrency
+        />
+      )
+
+      assert.ok(wrapper)
+      assert.equal(wrapper.find(TokenInput).length, 1)
+      assert.equal(wrapper.find(TokenInput).props().showFiat, false)
+      wrapper.setProps({ useETHAsPrimaryCurrency: false })
+      assert.equal(wrapper.find(TokenInput).props().showFiat, true)
+    })
+  })
+})

ui/app/components/user-preferenced-token-input/tests/user-preferenced-token-input.container.test.js

@@ -0,0 +1,31 @@
+import assert from 'assert'
+import proxyquire from 'proxyquire'
+
+let mapStateToProps
+
+proxyquire('../user-preferenced-token-input.container.js', {
+  'react-redux': {
+    connect: ms => {
+      mapStateToProps = ms
+      return () => ({})
+    },
+  },
+})
+
+describe('UserPreferencedTokenInput container', () => {
+  describe('mapStateToProps()', () => {
+    it('should return the correct props', () => {
+      const mockState = {
+        metamask: {
+          preferences: {
+            useETHAsPrimaryCurrency: true,
+          },
+        },
+      }
+
+      assert.deepEqual(mapStateToProps(mockState), {
+        useETHAsPrimaryCurrency: true,
+      })
+    })
+  })
+})

ui/app/components/user-preferenced-token-input/user-preferenced-token-input.component.js

@@ -0,0 +1,20 @@
+import React, { PureComponent } from 'react'
+import PropTypes from 'prop-types'
+import TokenInput from '../token-input'
+
+export default class UserPreferencedTokenInput extends PureComponent {
+  static propTypes = {
+    useETHAsPrimaryCurrency: PropTypes.bool,
+  }
+
+  render () {
+    const { useETHAsPrimaryCurrency, ...restProps } = this.props
+
+    return (
+      <TokenInput
+        {...restProps}
+        showFiat={!useETHAsPrimaryCurrency}
+      />
+    )
+  }
+}

ui/app/components/user-preferenced-token-input/user-preferenced-token-input.container.js

@@ -0,0 +1,13 @@
+import { connect } from 'react-redux'
+import UserPreferencedTokenInput from './user-preferenced-token-input.component'
+import { preferencesSelector } from '../../selectors'
+
+const mapStateToProps = state => {
+  const { useETHAsPrimaryCurrency } = preferencesSelector(state)
+
+  return {
+    useETHAsPrimaryCurrency,
+  }
+}
+
+export default connect(mapStateToProps)(UserPreferencedTokenInput)

ui/app/constants/common.js

@@ -1,3 +1,6 @@
 export const ETH = 'ETH'
 export const GWEI = 'GWEI'
 export const WEI = 'WEI'
+
+export const PRIMARY = 'PRIMARY'
+export const SECONDARY = 'SECONDARY'

ui/app/ducks/confirm-transaction.duck.js

@@ -14,7 +14,13 @@ import {
   hexGreaterThan,
 } from '../helpers/confirm-transaction/util'
 
-import { getTokenData, getMethodData, isSmartContractAddress } from '../helpers/transactions.util'
+import {
+  getTokenData,
+  getMethodData,
+  isSmartContractAddress,
+  sumHexes,
+} from '../helpers/transactions.util'
+
 import { getSymbolAndDecimals } from '../token-util'
 import { conversionUtil } from '../conversion-util'
 
@@ -31,7 +37,6 @@ const CLEAR_CONFIRM_TRANSACTION = createActionType('CLEAR_CONFIRM_TRANSACTION')
 const UPDATE_TRANSACTION_AMOUNTS = createActionType('UPDATE_TRANSACTION_AMOUNTS')
 const UPDATE_TRANSACTION_FEES = createActionType('UPDATE_TRANSACTION_FEES')
 const UPDATE_TRANSACTION_TOTALS = createActionType('UPDATE_TRANSACTION_TOTALS')
-const UPDATE_HEX_GAS_TOTAL = createActionType('UPDATE_HEX_GAS_TOTAL')
 const UPDATE_TOKEN_PROPS = createActionType('UPDATE_TOKEN_PROPS')
 const UPDATE_NONCE = createActionType('UPDATE_NONCE')
 const UPDATE_TO_SMART_CONTRACT = createActionType('UPDATE_TO_SMART_CONTRACT')
@@ -53,7 +58,9 @@ const initState = {
   ethTransactionAmount: '',
   ethTransactionFee: '',
   ethTransactionTotal: '',
-  hexGasTotal: '',
+  hexTransactionAmount: '',
+  hexTransactionFee: '',
+  hexTransactionTotal: '',
   nonce: '',
   toSmartContract: false,
   fetchingData: false,
@@ -99,30 +106,28 @@ export default function reducer ({ confirmTransaction: confirmState = initState
         methodData: {},
       }
     case UPDATE_TRANSACTION_AMOUNTS:
-      const { fiatTransactionAmount, ethTransactionAmount } = action.payload
+      const { fiatTransactionAmount, ethTransactionAmount, hexTransactionAmount } = action.payload
       return {
         ...confirmState,
         fiatTransactionAmount: fiatTransactionAmount || confirmState.fiatTransactionAmount,
         ethTransactionAmount: ethTransactionAmount || confirmState.ethTransactionAmount,
+        hexTransactionAmount: hexTransactionAmount || confirmState.hexTransactionAmount,
       }
     case UPDATE_TRANSACTION_FEES:
-      const { fiatTransactionFee, ethTransactionFee } = action.payload
+      const { fiatTransactionFee, ethTransactionFee, hexTransactionFee } = action.payload
       return {
         ...confirmState,
         fiatTransactionFee: fiatTransactionFee || confirmState.fiatTransactionFee,
         ethTransactionFee: ethTransactionFee || confirmState.ethTransactionFee,
+        hexTransactionFee: hexTransactionFee || confirmState.hexTransactionFee,
       }
     case UPDATE_TRANSACTION_TOTALS:
-      const { fiatTransactionTotal, ethTransactionTotal } = action.payload
+      const { fiatTransactionTotal, ethTransactionTotal, hexTransactionTotal } = action.payload
       return {
         ...confirmState,
         fiatTransactionTotal: fiatTransactionTotal || confirmState.fiatTransactionTotal,
         ethTransactionTotal: ethTransactionTotal || confirmState.ethTransactionTotal,
-      }
+        hexTransactionTotal: hexTransactionTotal || confirmState.hexTransactionTotal,
-    case UPDATE_HEX_GAS_TOTAL:
-      return {
-        ...confirmState,
-        hexGasTotal: action.payload,
       }
     case UPDATE_TOKEN_PROPS:
       const { tokenSymbol = '', tokenDecimals = '' } = action.payload
@@ -222,13 +227,6 @@ export function updateTransactionTotals (totals) {
   }
 }
 
-export function updateHexGasTotal (hexGasTotal) {
-  return {
-    type: UPDATE_HEX_GAS_TOTAL,
-    payload: hexGasTotal,
-  }
-}
-
 export function updateTokenProps (tokenProps) {
   return {
     type: UPDATE_TOKEN_PROPS,
@@ -297,7 +295,7 @@ export function updateTxDataAndCalculate (txData) {
 
     dispatch(updateTxData(txData))
 
-    const { txParams: { value, gas: gasLimit = '0x0', gasPrice = '0x0' } = {} } = txData
+    const { txParams: { value = '0x0', gas: gasLimit = '0x0', gasPrice = '0x0' } = {} } = txData
 
     const fiatTransactionAmount = getValueFromWeiHex({
       value, toCurrency: currentCurrency, conversionRate, numberOfDecimals: 2,
@@ -306,31 +304,39 @@ export function updateTxDataAndCalculate (txData) {
       value, toCurrency: 'ETH', conversionRate, numberOfDecimals: 6,
     })
 
-    dispatch(updateTransactionAmounts({ fiatTransactionAmount, ethTransactionAmount }))
+    dispatch(updateTransactionAmounts({
+      fiatTransactionAmount,
+      ethTransactionAmount,
+      hexTransactionAmount: value,
+    }))
 
-    const hexGasTotal = getHexGasTotal({ gasLimit, gasPrice })
+    const hexTransactionFee = getHexGasTotal({ gasLimit, gasPrice })
-
-    dispatch(updateHexGasTotal(hexGasTotal))
 
     const fiatTransactionFee = getTransactionFee({
-      value: hexGasTotal,
+      value: hexTransactionFee,
       toCurrency: currentCurrency,
       numberOfDecimals: 2,
       conversionRate,
     })
     const ethTransactionFee = getTransactionFee({
-      value: hexGasTotal,
+      value: hexTransactionFee,
       toCurrency: 'ETH',
       numberOfDecimals: 6,
       conversionRate,
     })
 
-    dispatch(updateTransactionFees({ fiatTransactionFee, ethTransactionFee }))
+    dispatch(updateTransactionFees({ fiatTransactionFee, ethTransactionFee, hexTransactionFee }))
 
     const fiatTransactionTotal = addFiat(fiatTransactionFee, fiatTransactionAmount)
     const ethTransactionTotal = addEth(ethTransactionFee, ethTransactionAmount)
-
+    console.log('HIHIH', value, hexTransactionFee)
-    dispatch(updateTransactionTotals({ fiatTransactionTotal, ethTransactionTotal }))
+    const hexTransactionTotal = sumHexes(value, hexTransactionFee)
+
+    dispatch(updateTransactionTotals({
+      fiatTransactionTotal,
+      ethTransactionTotal,
+      hexTransactionTotal,
+    }))
   }
 }
 

ui/app/ducks/tests/confirm-transaction.duck.test.js

@@ -19,7 +19,9 @@ const initialState = {
   ethTransactionAmount: '',
   ethTransactionFee: '',
   ethTransactionTotal: '',
-  hexGasTotal: '',
+  hexTransactionAmount: '',
+  hexTransactionFee: '',
+  hexTransactionTotal: '',
   nonce: '',
   toSmartContract: false,
   fetchingData: false,
@@ -34,7 +36,6 @@ const CLEAR_METHOD_DATA = 'metamask/confirm-transaction/CLEAR_METHOD_DATA'
 const UPDATE_TRANSACTION_AMOUNTS = 'metamask/confirm-transaction/UPDATE_TRANSACTION_AMOUNTS'
 const UPDATE_TRANSACTION_FEES = 'metamask/confirm-transaction/UPDATE_TRANSACTION_FEES'
 const UPDATE_TRANSACTION_TOTALS = 'metamask/confirm-transaction/UPDATE_TRANSACTION_TOTALS'
-const UPDATE_HEX_GAS_TOTAL = 'metamask/confirm-transaction/UPDATE_HEX_GAS_TOTAL'
 const UPDATE_TOKEN_PROPS = 'metamask/confirm-transaction/UPDATE_TOKEN_PROPS'
 const UPDATE_NONCE = 'metamask/confirm-transaction/UPDATE_NONCE'
 const UPDATE_TO_SMART_CONTRACT = 'metamask/confirm-transaction/UPDATE_TO_SMART_CONTRACT'
@@ -65,7 +66,9 @@ describe('Confirm Transaction Duck', () => {
         ethTransactionAmount: '1',
         ethTransactionFee: '0.000021',
         ethTransactionTotal: '469.27',
-        hexGasTotal: '0x1319718a5000',
+        hexTransactionAmount: '',
+        hexTransactionFee: '0x1319718a5000',
+        hexTransactionTotal: '',
         nonce: '0x0',
         toSmartContract: false,
         fetchingData: false,
@@ -186,12 +189,14 @@ describe('Confirm Transaction Duck', () => {
           payload: {
             fiatTransactionAmount: '123.45',
             ethTransactionAmount: '.5',
+            hexTransactionAmount: '0x1',
           },
         }),
         {
           ...mockState.confirmTransaction,
           fiatTransactionAmount: '123.45',
           ethTransactionAmount: '.5',
+          hexTransactionAmount: '0x1',
         }
       )
     })
@@ -203,12 +208,14 @@ describe('Confirm Transaction Duck', () => {
           payload: {
             fiatTransactionFee: '123.45',
             ethTransactionFee: '.5',
+            hexTransactionFee: '0x1',
           },
         }),
         {
           ...mockState.confirmTransaction,
           fiatTransactionFee: '123.45',
           ethTransactionFee: '.5',
+          hexTransactionFee: '0x1',
         }
       )
     })
@@ -220,25 +227,14 @@ describe('Confirm Transaction Duck', () => {
           payload: {
             fiatTransactionTotal: '123.45',
             ethTransactionTotal: '.5',
+            hexTransactionTotal: '0x1',
           },
         }),
         {
           ...mockState.confirmTransaction,
           fiatTransactionTotal: '123.45',
           ethTransactionTotal: '.5',
-        }
+          hexTransactionTotal: '0x1',
-      )
-    })
-
-    it('should update hexGasTotal when receiving an UPDATE_HEX_GAS_TOTAL action', () => {
-      assert.deepEqual(
-        ConfirmTransactionReducer(mockState, {
-          type: UPDATE_HEX_GAS_TOTAL,
-          payload: '0x0',
-        }),
-        {
-          ...mockState.confirmTransaction,
-          hexGasTotal: '0x0',
         }
       )
     })
@@ -435,19 +431,6 @@ describe('Confirm Transaction Duck', () => {
       )
     })
 
-    it('should create an action to update hexGasTotal', () => {
-      const hexGasTotal = '0x0'
-      const expectedAction = {
-        type: UPDATE_HEX_GAS_TOTAL,
-        payload: hexGasTotal,
-      }
-
-      assert.deepEqual(
-        actions.updateHexGasTotal(hexGasTotal),
-        expectedAction
-      )
-    })
-
     it('should create an action to update tokenProps', () => {
       const tokenProps = {
         tokenDecimals: '1',
@@ -568,7 +551,6 @@ describe('Confirm Transaction Duck', () => {
       const expectedActions = [
         'metamask/confirm-transaction/UPDATE_TX_DATA',
         'metamask/confirm-transaction/UPDATE_TRANSACTION_AMOUNTS',
-        'metamask/confirm-transaction/UPDATE_HEX_GAS_TOTAL',
         'metamask/confirm-transaction/UPDATE_TRANSACTION_FEES',
         'metamask/confirm-transaction/UPDATE_TRANSACTION_TOTALS',
       ]
@@ -637,7 +619,6 @@ describe('Confirm Transaction Duck', () => {
       const expectedActions = [
         'metamask/confirm-transaction/UPDATE_TX_DATA',
         'metamask/confirm-transaction/UPDATE_TRANSACTION_AMOUNTS',
-        'metamask/confirm-transaction/UPDATE_HEX_GAS_TOTAL',
         'metamask/confirm-transaction/UPDATE_TRANSACTION_FEES',
         'metamask/confirm-transaction/UPDATE_TRANSACTION_TOTALS',
       ]
@@ -687,7 +668,6 @@ describe('Confirm Transaction Duck', () => {
       const expectedActions = [
         'metamask/confirm-transaction/UPDATE_TX_DATA',
         'metamask/confirm-transaction/UPDATE_TRANSACTION_AMOUNTS',
-        'metamask/confirm-transaction/UPDATE_HEX_GAS_TOTAL',
         'metamask/confirm-transaction/UPDATE_TRANSACTION_FEES',
         'metamask/confirm-transaction/UPDATE_TRANSACTION_TOTALS',
       ]

ui/app/helpers/conversions.util.js

@@ -61,3 +61,22 @@ export function getValueFromWeiHex ({
     conversionRate,
   })
 }
+
+export function getWeiHexFromDecimalValue ({
+  value,
+  fromCurrency,
+  conversionRate,
+  fromDenomination,
+  invertConversionRate,
+}) {
+  return conversionUtil(value, {
+    fromNumericBase: 'dec',
+    toNumericBase: 'hex',
+    toCurrency: ETH,
+    fromCurrency,
+    conversionRate,
+    invertConversionRate,
+    fromDenomination,
+    toDenomination: WEI,
+  })
+}

ui/app/reducers/metamask.js

@@ -51,6 +51,9 @@ function reduceMetamask (state, action) {
     isRevealingSeedWords: false,
     welcomeScreenSeen: false,
     currentLocale: '',
+    preferences: {
+      useETHAsPrimaryCurrency: true,
+    },
   }, state.metamask)
 
   switch (action.type) {
@@ -365,6 +368,12 @@ function reduceMetamask (state, action) {
       })
     }
 
+    case actions.UPDATE_PREFERENCES: {
+      return extend(metamaskState, {
+        preferences: { ...action.payload },
+      })
+    }
+
     default:
       return metamaskState
 

ui/app/selectors.js

@@ -33,6 +33,7 @@ const selectors = {
   getSendMaxModeState,
   getCurrentViewContext,
   getTotalUnapprovedCount,
+  preferencesSelector,
 }
 
 module.exports = selectors
@@ -195,3 +196,7 @@ function getTotalUnapprovedCount ({ metamask }) {
   return Object.keys(unapprovedTxs).length + unapprovedMsgCount + unapprovedPersonalMsgCount +
     unapprovedTypedMessagesCount
 }
+
+function preferencesSelector ({ metamask }) {
+  return metamask.preferences
+}