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

5 files changed, 97 insertions, 0 deletions

diff --git a/ui/app/components/user-preferenced-currency-input/index.js b/ui/app/components/user-preferenced-currency-input/index.js
new file mode 100644
index 000000000..4dc70db3d
--- /dev/null
+++ b/ui/app/components/user-preferenced-currency-input/index.js
@@ -0,0 +1 @@
+export { default } from './user-preferenced-currency-input.container'
diff --git a/ui/app/components/user-preferenced-currency-input/tests/user-preferenced-currency-input.component.test.js b/ui/app/components/user-preferenced-currency-input/tests/user-preferenced-currency-input.component.test.js
new file mode 100644
index 000000000..0af80a03d
--- /dev/null
+++ b/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)
+    })
+  })
+})
diff --git a/ui/app/components/user-preferenced-currency-input/tests/user-preferenced-currency-input.container.test.js b/ui/app/components/user-preferenced-currency-input/tests/user-preferenced-currency-input.container.test.js
new file mode 100644
index 000000000..d860c38da
--- /dev/null
+++ b/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,
+      })
+    })
+  })
+})
diff --git a/ui/app/components/user-preferenced-currency-input/user-preferenced-currency-input.component.js b/ui/app/components/user-preferenced-currency-input/user-preferenced-currency-input.component.js
new file mode 100644
index 000000000..6e0e00a1d
--- /dev/null
+++ b/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}
+      />
+    )
+  }
+}
diff --git a/ui/app/components/user-preferenced-currency-input/user-preferenced-currency-input.container.js b/ui/app/components/user-preferenced-currency-input/user-preferenced-currency-input.container.js
new file mode 100644
index 000000000..397cdc7cc
--- /dev/null
+++ b/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)