mainwindow.h Example File

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 #ifndef MAINWINDOW_H
 #define MAINWINDOW_H

 #include <QtWidgets/qwidget.h>

 QT_FORWARD_DECLARE_CLASS(QGraphicsScene)
 QT_FORWARD_DECLARE_CLASS(QGraphicsView)
 QT_FORWARD_DECLARE_CLASS(QLabel)
 QT_FORWARD_DECLARE_CLASS(QSlider)
 QT_FORWARD_DECLARE_CLASS(QSplitter)

 class MainWindow : public QWidget
 {
     Q_OBJECT
 public:
     MainWindow(QWidget *parent = 0);

 private:
     void setupMatrix();
     void populateScene();

     QGraphicsScene *scene;
     QSplitter *h1Splitter;
     QSplitter *h2Splitter;
 };

 #endif