#include <QApplication>
#include <QWidget>
#include <QLabel>
#include <QScreen>
#include <QRect>
#include <QSize>
#include <QFont>
#include <QDebug>


int main(int argc, char **argv)
{
  QApplication app(argc, argv);
  QList<QScreen *> screenList = QApplication::screens();

  qWarning() << "screen count" << screenList.count();

  for (int i = 0; i < screenList.count(); i++)
  {
    QScreen *screen = screenList.at(i);
    QRect screenGeo(screen->geometry());

    qWarning() << "screen" << i << "at" << screenGeo;

    QWidget *widget = new QWidget(nullptr);

    QLabel *label = new QLabel(QString::number(i), widget);
    label->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);

    QFont font(label->font());
    font.setBold(true);
    font.setPointSize(120);
    label->setFont(font);

    widget->setGeometry(QRect(screenGeo.topLeft(), QSize(200, 200)));
    widget->activateWindow();
    widget->show();
  }

  return app.exec();
}