text: #ifndef MAINWINDOW_H
  #define MAINWINDOW_H
  #include <QWidget>
  #include <QMainWindow>
  #include "GLEcgCanvas.h"
  
  class MainWindow : public QMainWindow
  {
      Q_OBJECT
  public:
      MainWindow();
  private:
      GLEcgCanvas *m_ecg;
  private slots:
      void openFile();
  };
  
  #endif
  