Wrong scaling on printing QWebView

[raginx]

Hello all,

i have a QWebView loading PDF.js with an pdf file, this works fine. But when i try to print the pdf file, the page have a wrong scaling. The print have a lot of white space on the bottom and on the right.

I discovered, that it depends on the window size. So if i reduce the window size, the white space on the print output changes.

Here is some code:

//Loading PDFjs with PDF
QUrl viewer = QUrl::fromLocalFile(QFileInfo("pdfjs/web/viewer.html").absoluteFilePath());
this->ui->webView->load(viewer.url() + "?file=../../files/pdffile.pdf");


// Printing
QPrinter printer;
printer.setFullPage(true);

QPrintDialog* pd = new QPrintDialog(&printer, this);
if(pd->exec() == QDialog::Accepted) {
    this->ui->webView->print(&printer);
}

I also tried to prepare document for printing with

this->ui->webView->page()->mainFrame()->evaluateJavaScript("window.print();");

But than output is completely blank ... idk whats wrong with that :o

What am i doing wrong?
Thanks in advanced :)