Use ui file for main window.

src/calamares/CMakeLists.txt

@@ -11,7 +11,7 @@ set( calamaresSources
 )
 
 set( calamaresUi
-    #ui files go here
+    CalamaresWindow.ui
 )
 
 include_directories(

src/calamares/CalamaresWindow.cpp

@@ -0,0 +1,25 @@
+/* === This file is part of Calamares - <http://github.com/calamares> ===
+ *
+ *   Copyright 2014, Teo Mrnjavac <teo@kde.org>
+ *
+ *   Calamares is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   Calamares is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "CalamaresWindow.h"
+
+CalamaresWindow::CalamaresWindow( QWidget* parent )
+    : QWidget( parent )
+{
+    setupUi( this );
+}

src/calamares/CalamaresWindow.h

@@ -19,10 +19,16 @@
 #ifndef CALAMARESWINDOW_H
 #define CALAMARESWINDOW_H
 
-#include <QMainWindow>
+#include "ui_CalamaresWindow.h"
 
-class CalamaresWindow : public QMainWindow
+#include <QWidget>
+
+class CalamaresWindow : public QWidget, private Ui::Base
 {
+    Q_OBJECT
+public:
+    CalamaresWindow( QWidget* parent = 0 );
+    virtual ~CalamaresWindow() {}
 
 };