Add unread notifications badge to the navigation bar

app/javascript/flavours/glitch/features/drawer/header/index.js

@@ -46,6 +46,7 @@ const messages = defineMessages({
 //  The component.
 export default function DrawerHeader ({
   columns,
+  unreadNotifications,
   intl,
   onSettingsClick,
 }) {
@@ -77,7 +78,12 @@ export default function DrawerHeader ({
           aria-label={intl.formatMessage(messages.notifications)}
           title={intl.formatMessage(messages.notifications)}
           to='/notifications'
-        ><Icon icon='bell' /></Link>
+        >
+          <span className='icon-badge-wrapper'>
+            <Icon icon='bell' />
+            { unreadNotifications > 0 && <div className='icon-badge' />}
+          </span>
+        </Link>
       ))}
       {renderForColumn('COMMUNITY', (
         <Link
@@ -112,6 +118,7 @@ export default function DrawerHeader ({
 //  Props.
 DrawerHeader.propTypes = {
   columns: ImmutablePropTypes.list,
+  unreadNotifications: PropTypes.number,
   intl: PropTypes.object,
   onSettingsClick: PropTypes.func,
 };

app/javascript/flavours/glitch/features/drawer/index.js

@@ -34,6 +34,7 @@ const mapStateToProps = state => ({
   searchHidden: state.getIn(['search', 'hidden']),
   searchValue: state.getIn(['search', 'value']),
   submitted: state.getIn(['search', 'submitted']),
+  unreadNotifications: state.getIn(['notifications', 'unread']),
 });
 
 //  Dispatch mapping.
@@ -87,6 +88,7 @@ class Drawer extends React.Component {
       searchValue,
       submitted,
       isSearchPage,
+      unreadNotifications,
     } = this.props;
     const computedClass = classNames('drawer', `mbstobon-${elefriend}`);
 
@@ -96,6 +98,7 @@ class Drawer extends React.Component {
         {multiColumn ? (
           <DrawerHeader
             columns={columns}
+            unreadNotifications={unreadNotifications}
             intl={intl}
             onSettingsClick={onOpenSettings}
           />
@@ -139,6 +142,7 @@ Drawer.propTypes = {
   searchHidden: PropTypes.bool,
   searchValue: PropTypes.string,
   submitted: PropTypes.bool,
+  unreadNotifications: PropTypes.number,
 
   //  Dispatch props.
   onChange: PropTypes.func,

app/javascript/flavours/glitch/styles/components/index.scss

@@ -1121,6 +1121,22 @@
   left: 0;
 }
 
+.icon-badge-wrapper {
+  position: relative;
+}
+
+.icon-badge {
+  position: absolute;
+  display: block;
+  right: -.25em;
+  top: -.25em;
+  background-color: $ui-highlight-color;
+  border-radius: 50%;
+  font-size: 75%;
+  width: 1em;
+  height: 1em;
+}
+
 ::-webkit-scrollbar-thumb {
   border-radius: 0;
 }