up

mainwindow.h

@@ -15,6 +15,9 @@ class MainWindow : public QMainWindow
 		explicit MainWindow(QWidget *parent = root);
 		~MainWindow();
 
+	protected:
+		void paintEvent(QPaintEvent* event) Q_DECL_OVERRIDE;
+
 	private:
 		constexpr static QWidget* root = 0;
 		Ui::MainWindow *ui;