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void MainWindow::filePrintPreview ()
{
QPrinter printer(QPrinter::HighResolution);
QPrintPreviewDialog preview(&printer, this);
connect(&preview, SIGNAL(paintRequested(QPrinter*)), SLOT(printPreview(QPrinter*)));
preview.exec ();
}
void MainWindow::printPreview (QPrinter *printer)
{
textEdit->print(printer);
}