cut out NavToggle component

browser/components/NavToggleButton.js

@@ -0,0 +1,29 @@
+/**
+* @fileoverview Micro component for toggle SideNav
+*/
+import React, { PropTypes } from 'react'
+import styles from './NavToggleButton.styl'
+import CSSModules from 'browser/lib/CSSModules'
+
+/**
+* @param {boolean} isFolded
+* @param {Function} handleToggleButtonClick
+*/
+
+const NavToggleButton = ({isFolded, handleToggleButtonClick}) => (
+  <button styleName='navToggle'
+    onClick={(e) => handleToggleButtonClick(e)}
+  >
+    {isFolded
+     ? <i className='fa fa-angle-double-right' />
+     : <i className='fa fa-angle-double-left' />
+    }
+  </button>
+)
+
+NavToggleButton.propTypes = {
+  isFolded: PropTypes.bool.isRequired,
+  handleToggleButtonClick: PropTypes.func.isRequired
+}
+
+export default CSSModules(NavToggleButton, styles)

browser/components/NavToggleButton.styl

@@ -0,0 +1,19 @@
+.navToggle
+  navButtonColor()
+  display block
+  position absolute
+  right 5px
+  bottom 5px
+  border-radius 16.5px
+  height 34px
+  width 34px
+  line-height 32px
+  padding 0
+
+body[data-theme="dark"]
+  .navToggle
+    &:hover
+      background-color alpha($ui-dark-button--active-backgroundColor, 20%)
+      transition 0.15s
+      color $ui-dark-text-color
+