Can cancel membership request

lib/helpers/groups_helper.dart

@@ -114,6 +114,10 @@ class GroupsHelper {
   Future<bool> cancelRequest(int groupID) async =>
       _simpleMembershipRequest(groupID, "groups/cancel_request");
 
+  /// Send a new membership request
+  Future<bool> sendRequest(int groupID) async =>
+      _simpleMembershipRequest(groupID, "groups/send_request");
+
   /// Turn an API entry into a group object
   Group _getGroupFromAPI(Map<String, dynamic> map) {
     return Group(

lib/ui/widgets/group_membership_widget.dart

@@ -49,8 +49,7 @@ class _GroupMembershipWidgetState extends SafeState<GroupMembershipWidget> {
         return _buildPendingState();
 
       case GroupMembershipLevel.VISITOR:
-        // TODO: Handle this case.
+        return _buildVisitorState();
-        break;
     }
   }
 
@@ -79,4 +78,28 @@ class _GroupMembershipWidgetState extends SafeState<GroupMembershipWidget> {
       if (this.widget.onUpdated != null) this.widget.onUpdated();
     }
   }
+
+  /// Build visitor state
+  Widget _buildVisitorState() {
+    return RichText(
+      text: TextSpan(
+          text: tr("Request membership"),
+          style: TextStyle(color: Colors.blue),
+          recognizer: TapGestureRecognizer()
+            ..onTap = () => _requestMembership()),
+    );
+  }
+
+  /// Create new membership request
+  void _requestMembership() async {
+    if (!await GroupsHelper().sendRequest(_id))
+      showSimpleSnack(context, tr("Could not send your membership request!"));
+    else {
+      // Refresh state
+      group.membershipLevel = GroupMembershipLevel.PENDING;
+      this.setState(() {});
+
+      if (this.widget.onUpdated != null) this.widget.onUpdated();
+    }
+  }
 }