#include <QtWidgets>

class myLabel: public QLabel
{   

  public:    
	myLabel()
	{
	  this->setAlignment(Qt::AlignCenter);
	  
	
	};
	~ myLabel(){};
	
	void wheelEvent ( QWheelEvent * event )
	{			
	if(event->modifiers()==Qt::AltModifier)
		qDebug()<<"Got it the Alt";
	if(event->modifiers()==Qt::ShiftModifier)
		qDebug()<<"Got it the Shift";
	else
		qDebug()<<event->modifiers();

	}; 

	public:
 static  int x;
};

int main(int argc, char **argv)
{
	QApplication app(argc, argv);

	QMainWindow *window = new QMainWindow();
       
    QWidget *centralWidget = new QWidget(window);
	QHBoxLayout* layout = new QHBoxLayout(centralWidget);
	
    myLabel* scrollStepLabel = new myLabel();
	layout->addWidget(scrollStepLabel);
	
	window->setCentralWidget(centralWidget);
	
	window->show();
	return app.exec();
}