#include <QApplication>
#include <QMainWindow>
#include <QEvent>
#include <QDebug>

class Application : public QApplication{

public:
    Application(int& argv, char** argc)
        : QApplication(argv, argc)
    {}

protected:
    bool event(QEvent* event)
    {
        if (event->type() == QEvent::TabletEnterProximity){
            qDebug() << "Tablet enters proximity";
            return true;
        }
        if (event->type() == QEvent::TabletLeaveProximity){
            qDebug() << "Tablet leaves proximity";
            return true;
        }
        return QApplication::event(event);
    }
};

int main(int argc, char *argv[])
{
    Application a(argc, argv);
    QMainWindow w;
    w.show();

    return a.exec();
}