diff --git a/src/invitationdialog.cpp b/src/invitationdialog.cpp
new file mode 100644
index 0000000..bea2693
--- /dev/null
+++ b/src/invitationdialog.cpp
@@ -0,0 +1,55 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil -*- */
+/*
+ * Copyright (c) 2013, Regents of the University of California
+ *                     Yingdi Yu
+ *
+ * BSD license, See the LICENSE file for more information
+ *
+ * Author: Yingdi Yu <yingdi@cs.ucla.edu>
+ */
+
+
+#include "invitationdialog.h"
+#include "ui_invitationdialog.h"
+
+using namespace std;
+
+InvitationDialog::InvitationDialog(QWidget *parent) :
+    QDialog(parent),
+    ui(new Ui::InvitationDialog)
+{
+    ui->setupUi(this);
+}
+
+InvitationDialog::~InvitationDialog()
+{
+    delete ui;
+}
+
+void
+InvitationDialog::setMsg(const string& inviter, const string& chatroom)
+{
+  string msg = inviter;
+  msg.append(" invites you to join the chat room: ");
+  
+  ui->msgLabel->setText(QString::fromUtf8(msg.c_str()));
+  ui->chatroomLine->setText(QString::fromUtf8(msg.c_str()));
+}
+
+void
+InvitationDialog::onOkClicked()
+{ emit invitationAccepted(m_interestName); }
+  
+void
+InvitationDialog::onCancelClicked()
+{ 
+  ui->msgLabel->clear();
+  ui->chatroomLine->clear();
+  m_interestName = Name();
+  emit invitationRejected(m_interestName); 
+}
+
+#if WAF
+#include "invitationdialog.moc"
+#include "invitationdialog.cpp.moc"
+#endif