Add ButtonGroup component

ui/app/components/button-group/button-group.component.js

@@ -0,0 +1,61 @@
+import React, { PureComponent } from 'react'
+import PropTypes from 'prop-types'
+import classnames from 'classnames'
+
+export default class ButtonGroup extends PureComponent {
+  static propTypes = {
+    defaultActiveButtonIndex: PropTypes.number,
+    disabled: PropTypes.bool,
+    children: PropTypes.array,
+    className: PropTypes.string,
+    style: PropTypes.object,
+  }
+
+  static defaultProps = {
+    className: 'button-group',
+  }
+
+  state = {
+    activeButtonIndex: this.props.defaultActiveButtonIndex || 0,
+  }
+
+  handleButtonClick (activeButtonIndex) {
+    this.setState({ activeButtonIndex })
+  }
+
+  renderButtons () {
+    const { children, disabled } = this.props
+
+    return React.Children.map(children, (child, index) => {
+      return child && (
+        <button
+          className={classnames(
+            'button-group__button',
+            { 'button-group__button--active': index === this.state.activeButtonIndex },
+          )}
+          onClick={() => {
+            this.handleButtonClick(index)
+            child.props.onClick && child.props.onClick()
+          }}
+          disabled={disabled || child.props.disabled}
+          key={index}
+        >
+          { child.props.children }
+        </button>
+      )
+    })
+  }
+
+  render () {
+    const { className, style } = this.props
+
+    return (
+      <div
+        className={className}
+        style={style}
+      >
+        { this.renderButtons() }
+      </div>
+    )
+  }
+}

ui/app/components/button-group/button-group.stories.js

@@ -0,0 +1,49 @@
+import React from 'react'
+import { storiesOf } from '@storybook/react'
+import { action } from '@storybook/addon-actions'
+import ButtonGroup from './'
+import Button from '../button'
+import { text, boolean } from '@storybook/addon-knobs/react'
+
+storiesOf('ButtonGroup', module)
+  .add('with Buttons', () =>
+    <ButtonGroup
+      style={{ width: '300px' }}
+      disabled={boolean('Disabled', false)}
+      defaultActiveButtonIndex={1}
+    >
+      <Button
+        onClick={action('cheap')}
+      >
+        {text('Button1', 'Cheap')}
+      </Button>
+      <Button
+        onClick={action('average')}
+      >
+        {text('Button2', 'Average')}
+      </Button>
+      <Button
+        onClick={action('fast')}
+      >
+        {text('Button3', 'Fast')}
+      </Button>
+    </ButtonGroup>
+  )
+  .add('with a disabled Button', () =>
+    <ButtonGroup
+      style={{ width: '300px' }}
+      disabled={boolean('Disabled', false)}
+    >
+      <Button
+        onClick={action('enabled')}
+      >
+        {text('Button1', 'Enabled')}
+      </Button>
+      <Button
+        onClick={action('disabled')}
+        disabled
+      >
+        {text('Button2', 'Disabled')}
+      </Button>
+    </ButtonGroup>
+  )

ui/app/components/button-group/index.js

@@ -0,0 +1 @@
+export { default } from './button-group.component'

ui/app/components/button-group/index.scss

@@ -0,0 +1,38 @@
+.button-group {
+  display: flex;
+  justify-content: center;
+  align-items: center;
+
+  &__button {
+    font-family: Roboto;
+    font-size: 1rem;
+    color: $tundora;
+    border-style: solid;
+    border-color: $alto;
+    border-width: 1px 1px 1px;
+    border-left: 0;
+    flex: 1;
+    padding: 12px;
+    white-space: nowrap;
+    overflow: hidden;
+    text-overflow: ellipsis;
+
+    &:first-child {
+      border-left: 1px solid $alto;
+      border-radius: 4px 0 0 4px;
+    }
+
+    &:last-child {
+      border-radius: 0 4px 4px 0;
+    }
+
+    &--active {
+      background-color: $dodger-blue;
+      color: $white;
+    }
+
+    &:disabled {
+      opacity: .5;
+    }
+  }
+}

ui/app/components/index.scss

@@ -1,3 +1,5 @@
+@import './button-group/index';
+
 @import './export-text-container/index';
 
 @import './selected-account/index';