struct TestWidget : public QWidget
{
  virtual void dragEnterEvent(QDragEnterEvent* e) {
    e->accept();
  }

  virtual void dragMoveEvent(QDragMoveEvent* e) {
    qDebug() << "active keyboard modifiers" << QApplication::queryKeyboardModifiers() << e->keyboardModifiers();

  }
};

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

  TestWidget* tw = new TestWidget;
  tw->setAcceptDrops(true);
  tw->resize(300,300);
  tw->show();

  return app.exec();
}