problem printing a QTableWidget

[rmagro]

Hi all,
the code that follows stop working correctly when I upgrade from Qt4.2.2 to Qt4.4.3..
The only think printed is a bold black line..

Any clue about how I can solve?

Thx very mutch

QPrinter printer(QPrinter::HighResolution);
	printer.setOrientation(QPrinter::Landscape);
 
 	QTableWidget *newTableWidget = tableWidget;
 
	QPrintDialog dlg(&printer, this);
 
	if (dlg.exec() == QDialog::Accepted) 
    {
        // calculate the total width/height table would need without scaling  
        const int rows = newTableWidget ->model()->rowCount(); 
        const int cols = newTableWidget ->model()->columnCount();  
 
		double totalWidth = 0.0;
 
        for (int c = 0; c < cols; ++c)  
        {  
			totalWidth += newTableWidget ->columnWidth(c); 
        }
 
		double totalHeight = 0.0;
 
        for (int r = 0; r < rows; ++r) 
        { 
			totalHeight += newTableWidget ->rowHeight(r);
        }
 
		double totalHeight1;
		int num_page = 1;
 
		while (totalHeight > 900)
		{
			totalHeight1 = 900;
 
			// redirect table's painting on a pixmap 
			QPixmap pixmap(totalWidth, newTableWidget->horizontalHeader()->height());
			QPixmap pixmap1(totalWidth, totalHeight1);
 
			QPaintEvent event(QRect(0, 0, totalWidth, newTableWidget->horizontalHeader()->height()));
			QPaintEvent event1(QRect(0, 0, totalWidth, totalHeight1));
 
			QPainter::setRedirected(newTableWidget->horizontalHeader()->viewport(), &pixmap);		
			QApplication::sendEvent(newTableWidget->horizontalHeader()->viewport(), &event);
			QPainter::restoreRedirected(newTableWidget->horizontalHeader()->viewport());
 
			QPainter::setRedirected(newTableWidget->viewport(), &pixmap1);		
			QApplication::sendEvent(newTableWidget->viewport(), &event1);	
			QPainter::restoreRedirected(newTableWidget->viewport());
 
			// print scaled pixmap 
			QPainter painter(&printer);
 
			QDateTime dataDiOggi = QDateTime::currentDateTime();
			QString dataDiOggiStringa = dataDiOggi.toString("dd.MM.yyyy hh:mm:ss");
 
			painter.drawText(0, 250, tr("Qt 4.3.3 - Date: %1 -") .arg(dataDiOggiStringa));
			painter.drawText(0, 150, tr("Page %1") .arg(num_page));
 
			painter.scale(4.5,4.5);
			painter.drawPixmap(0, 100, totalWidth, newTableWidget->horizontalHeader()->height(), pixmap);
			painter.drawPixmap(0, 100+newTableWidget->horizontalHeader()->height(), totalWidth, totalHeight1, pixmap1);
 
			totalHeight = totalHeight - totalHeight1;
			printer.newPage();
			numero_pagina = numero_pagina + 1;
		}
 
		QPixmap pixmap(totalWidth, newTableWidget->horizontalHeader()->height());
		QPixmap pixmap1(totalWidth, totalHeight);
 
		QPaintEvent event(QRect(0, 0, totalWidth, newTableWidget->horizontalHeader()->height()));
		QPaintEvent event1(QRect(0, 0, totalWidth, totalHeight));
 
		QPainter::setRedirected(newTableWidget->horizontalHeader()->viewport(), &pixmap);		
		QApplication::sendEvent(newTableWidget->horizontalHeader()->viewport(), &event);
		QPainter::restoreRedirected(newTableWidget->horizontalHeader()->viewport());
 
		QPainter::setRedirected(newTableWidget->viewport(), &pixmap1);		
		QApplication::sendEvent(newTableWidget->viewport(), &event1);	
		QPainter::restoreRedirected(newTableWidget->viewport());
 
		// print scaled pixmap 
		QPainter painter(&printer);
 
		QDateTime dataDiOggi = QDateTime::currentDateTime();
		QString dataDiOggiStringa = dataDiOggi.toString("dd.MM.yyyy hh:mm:ss");
 
		painter.drawText(0, 250, tr("Qt 4.3.3 - Date: %1 - ") .arg(dataDiOggiStringa));
		painter.drawText(0, 150, tr("Page %1") .arg(num_page));
 
		painter.scale(4.5,4.5);
		painter.drawPixmap(0, 100, totalWidth, newTableWidget->horizontalHeader()->height(), pixmap);
		painter.drawPixmap(0, 100+newTableWidget->horizontalHeader()->height(), totalWidth, totalHeight, pixmap1);
	}

QPrinter printer(QPrinter::HighResolution);
	printer.setOrientation(QPrinter::Landscape);
	
 	QTableWidget *newTableWidget = tableWidget;

	QPrintDialog dlg(&printer, this);

	if (dlg.exec() == QDialog::Accepted) 
    {
        // calculate the total width/height table would need without scaling  
        const int rows = newTableWidget ->model()->rowCount(); 
        const int cols = newTableWidget ->model()->columnCount();  
        
		double totalWidth = 0.0;

        for (int c = 0; c < cols; ++c)  
        {  
			totalWidth += newTableWidget ->columnWidth(c); 
        }

		double totalHeight = 0.0;

        for (int r = 0; r < rows; ++r) 
        { 
			totalHeight += newTableWidget ->rowHeight(r);
        }
	    
		double totalHeight1;
		int num_page = 1;
		
		while (totalHeight > 900)
		{
			totalHeight1 = 900;
		
			// redirect table's painting on a pixmap 
			QPixmap pixmap(totalWidth, newTableWidget->horizontalHeader()->height());
			QPixmap pixmap1(totalWidth, totalHeight1);

			QPaintEvent event(QRect(0, 0, totalWidth, newTableWidget->horizontalHeader()->height()));
			QPaintEvent event1(QRect(0, 0, totalWidth, totalHeight1));

			QPainter::setRedirected(newTableWidget->horizontalHeader()->viewport(), &pixmap);		
			QApplication::sendEvent(newTableWidget->horizontalHeader()->viewport(), &event);
			QPainter::restoreRedirected(newTableWidget->horizontalHeader()->viewport());
				
			QPainter::setRedirected(newTableWidget->viewport(), &pixmap1);		
			QApplication::sendEvent(newTableWidget->viewport(), &event1);	
			QPainter::restoreRedirected(newTableWidget->viewport());

			// print scaled pixmap 
			QPainter painter(&printer);

			QDateTime dataDiOggi = QDateTime::currentDateTime();
			QString dataDiOggiStringa = dataDiOggi.toString("dd.MM.yyyy hh:mm:ss");

			painter.drawText(0, 250, tr("Qt 4.3.3 - Date: %1 -") .arg(dataDiOggiStringa));
			painter.drawText(0, 150, tr("Page %1") .arg(num_page));
			
			painter.scale(4.5,4.5);
			painter.drawPixmap(0, 100, totalWidth, newTableWidget->horizontalHeader()->height(), pixmap);
			painter.drawPixmap(0, 100+newTableWidget->horizontalHeader()->height(), totalWidth, totalHeight1, pixmap1);
	
			totalHeight = totalHeight - totalHeight1;
			printer.newPage();
			numero_pagina = numero_pagina + 1;
		}
		
		QPixmap pixmap(totalWidth, newTableWidget->horizontalHeader()->height());
		QPixmap pixmap1(totalWidth, totalHeight);

		QPaintEvent event(QRect(0, 0, totalWidth, newTableWidget->horizontalHeader()->height()));
		QPaintEvent event1(QRect(0, 0, totalWidth, totalHeight));

		QPainter::setRedirected(newTableWidget->horizontalHeader()->viewport(), &pixmap);		
		QApplication::sendEvent(newTableWidget->horizontalHeader()->viewport(), &event);
		QPainter::restoreRedirected(newTableWidget->horizontalHeader()->viewport());
			
		QPainter::setRedirected(newTableWidget->viewport(), &pixmap1);		
		QApplication::sendEvent(newTableWidget->viewport(), &event1);	
		QPainter::restoreRedirected(newTableWidget->viewport());

		// print scaled pixmap 
		QPainter painter(&printer);

		QDateTime dataDiOggi = QDateTime::currentDateTime();
		QString dataDiOggiStringa = dataDiOggi.toString("dd.MM.yyyy hh:mm:ss");

		painter.drawText(0, 250, tr("Qt 4.3.3 - Date: %1 - ") .arg(dataDiOggiStringa));
		painter.drawText(0, 150, tr("Page %1") .arg(num_page));

		painter.scale(4.5,4.5);
		painter.drawPixmap(0, 100, totalWidth, newTableWidget->horizontalHeader()->height(), pixmap);
		painter.drawPixmap(0, 100+newTableWidget->horizontalHeader()->height(), totalWidth, totalHeight, pixmap1);
	}

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[high_flyer]

With out looking to much in to the code, if this is NOT in a paintEvent(), this should not have worked on Qt4.X at all.

[rmagro]

Surely QPaintEvent is used

QPaintEvent event(QRect(0, 0, totalWidth, newTableWidget->horizontalHeader()->height()));
        QPaintEvent event1(QRect(0, 0, totalWidth, totalHeight));

QPaintEvent event(QRect(0, 0, totalWidth, newTableWidget->horizontalHeader()->height()));
        QPaintEvent event1(QRect(0, 0, totalWidth, totalHeight));

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[high_flyer]

EDIT
Deleted

[rmagro]

Any help??
with Qt 4.2.2 the code works good. With higher version it stops working correctly. I mean it does not print QtableWidget but only a blod black line..
Thx
Roby

[faldzip]

I didn't inspect your code much but I imagine you use paint events to paint table widget on a pixmap? If so then just use QWidget::render() - much more simple, so much less space for mistake.