#include <QtWidgets/QApplication>
#include <QMainWindow>
#include <QPrinter>
#include <QPrinterInfo>
#include <QPrintDialog>
#include <QVBoxLayout>
#include <QWebEngineView>
#include <QPushButton>

class WebWindow : public QWidget {
public:
  WebWindow(QWidget* parent) : QWidget(parent) {
    QVBoxLayout* lay = new QVBoxLayout(this);
    setLayout(lay);
    view_ = new QWebEngineView(this);
    view_->load(QString("http://www.google.com"));
    lay->addWidget(view_);
    QPushButton* print = new QPushButton(tr("Print"));
    connect(print, &QPushButton::clicked, this, &WebWindow::print);
    lay->addWidget(print);
  }

private:
  QWebEngineView* view_;

  void print() {
    QPrinterInfo dev = QPrinterInfo::defaultPrinter();
    QPrinter printer(dev, QPrinter::ScreenResolution);
    printer.setCopyCount(2);
    QPrintDialog d(&printer, this);
    if (d.exec() == QDialog::Accepted) {
      QEventLoop loop;
      connect(view_, &QWebEngineView::printFinished, [&](bool s) { loop.quit(); });
      view_->print(&printer);
      loop.exec();
    }
  }
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QMainWindow mw;
    WebWindow ww(&mw);
    mw.setCentralWidget(&ww);
    mw.show();
    return a.exec();
}