Qgraphicsview can't preview by QPrintPreviewDialog

[qylibohao]

@void MainWindow:: openPrintPreviewDialog()
{
QPrinter printer(QPrinter::HighResolution);
printer.setPaperSize(QPrinter::A4);

QPainter painter(&printer);
GetCurWindow()->getView()->render(&painter);
QPrintPreviewDialog preview(&printer,this);
connect(&preview, SIGNAL(paintRequested(QPrinter *)),this,SLOT(printPreView(QPrinter *)));
preview.exec();
}

void MainWindow:: printPreView( QPrinter * printer)
{
///view
GraphicsView* currView = GetCurWindow()->getView();
QPainter painter(printer);
currView->render(&painter );
}
@
why graphicsview can preview by qprintpreviewdialog ?

[rokemoon]

Please use tag @ for code, just for better readability.

[rokemoon]

Here the code that works for me:
@

void MainWindow::print()
{
QPrinter printer(QPrinter::HighResolution);
printer.setPaperSize(QPrinter::A4);
QPrintPreviewDialog preview(&printer, this);
connect(&preview, SIGNAL(paintRequested(QPrinter*)), SLOT(printPreview(QPrinter*)));
preview.exec();
}

void MainWindow::printPreview(QPrinter *printer)
{
QPainter painter(printer);
m_graphicsView->render(&painter);
}
@