modify: cut down the component from SideNav component

browser/components/StorageItem.js

@@ -0,0 +1,57 @@
+/**
+ * @fileoverview Micro component for showing storage.
+ */
+import React, { PropTypes } from 'react'
+import styles from './StorageItem.styl'
+import CSSModules from 'browser/lib/CSSModules'
+
+/**
+ * @param {boolean} isActive
+ * @param {Function} handleButtonClick
+ * @param {Function} handleContextMenu
+ * @param {string} folderName
+ * @param {string} folderColor
+ * @param {boolean} isFolded
+ * @param {number} noteCount
+ * @return {React.Component}
+ */
+const StorageItem = ({
+  isActive, handleButtonClick, handleContextMenu, folderName,
+  folderColor, isFolded, noteCount
+}) => (
+  <button styleName={isActive
+      ? 'folderList-item--active'
+      : 'folderList-item'
+    }
+    onClick={handleButtonClick}
+    onContextMenu={handleContextMenu}
+  >
+    <span styleName={isFolded ?
+      'folderList-item-name--folded' : 'folderList-item-name'
+    }
+      style={{borderColor: folderColor}}
+    >
+      {isFolded ? folderName.substring(0, 1) : folderName}
+    </span>
+    {!isFolded &&
+      <span styleName='folderList-item-noteCount'>{noteCount}</span>
+    }
+    {isFolded &&
+      <span styleName='folderList-item-tooltip'>
+        {folderName}
+      </span>
+    }
+  </button>
+)
+
+StorageItem.propTypes = {
+  isActive: PropTypes.bool.isRequired,
+  handleButtonClick: PropTypes.func,
+  handleContextMenu: PropTypes.func,
+  folderName: PropTypes.string.isRequired,
+  folderColor: PropTypes.string,
+  isFolded: PropTypes.bool.isRequired,
+  noteCount: PropTypes.number.isRequired,
+}
+
+export default CSSModules(StorageItem, styles)