QTableView printing

[jpn]

Maybe you need to save the QPainter always before scaling and translating and restore it afterwards. You are using the same QPainter object for painting all pages, this means you are also scaling it again and again.

• QPainter::save()
• QPainter::restore()

[derrickbj]

hmmm..I'm not exactly sure. Here's what I tried based on your idea...

void PrintTableView::printTable(QPrinter* printer, QPainter* painter, const QRect& area)
{
        const int rows = model()->rowCount();
        const int columns = model()->columnCount();
 
		double totalWidth = 0.0;
		double totalPageHeight = 0.0;
		double totalHeight = 0.0;
		for (int c = 0; c < columns; ++c)
		{
			totalWidth += columnWidth(c);
		}
 
		for (int p = 0; p < 45; ++p)
		{
			totalPageHeight += rowHeight(p);
		}
 
		for (int r = 0; r<rows; ++r)
		{
			totalHeight += rowHeight(r);
		}
 
		const double xscale = area.width() / totalWidth;
		const double yscale = area.height() / totalHeight; 
		const double pscale = area.height() / totalPageHeight;
 
		painter->scale(xscale, yscale);
		painter->translate(area.x() + xscale, area.y() + pscale);
		painter->save();
 
		bool ok;
		int x=0;
 
		for (int r = 0; r < rows; ++r) {
			++x;
			for (int c = 0; c < columns; ++c) {
				QModelIndex idx = model()->index(r,c);
				QStyleOptionViewItem option = viewOptions();
				option.rect = visualRect(idx);
				itemDelegate()->paint(painter, option, idx);
            }
			if (x == 45)
			{
				ok = printer->newPage();
				x = 0;
				painter->restore();
			} 
        }	
}

void PrintTableView::printTable(QPrinter* printer, QPainter* painter, const QRect& area)
{
        const int rows = model()->rowCount();
        const int columns = model()->columnCount();

		double totalWidth = 0.0;
		double totalPageHeight = 0.0;
		double totalHeight = 0.0;
		for (int c = 0; c < columns; ++c)
		{
			totalWidth += columnWidth(c);
		}
		
		for (int p = 0; p < 45; ++p)
		{
			totalPageHeight += rowHeight(p);
		}
		
		for (int r = 0; r<rows; ++r)
		{
			totalHeight += rowHeight(r);
		}
		
		const double xscale = area.width() / totalWidth;
		const double yscale = area.height() / totalHeight; 
		const double pscale = area.height() / totalPageHeight;

		painter->scale(xscale, yscale);
		painter->translate(area.x() + xscale, area.y() + pscale);
		painter->save();
	
		bool ok;
		int x=0;
	
		for (int r = 0; r < rows; ++r) {
			++x;
			for (int c = 0; c < columns; ++c) {
				QModelIndex idx = model()->index(r,c);
				QStyleOptionViewItem option = viewOptions();
				option.rect = visualRect(idx);
				itemDelegate()->paint(painter, option, idx);
            }
			if (x == 45)
			{
				ok = printer->newPage();
				x = 0;
				painter->restore();
			} 
        }	
}

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if I put painter->save() before the painter->scale(), it prints every page, but only in a very very small square. if I leave it the way it is shown here, it prints every page stretched to page width, but compressed to 1/8th the page. If I do painter->scale(xscale, pscale),and leave painter->save() after painter->translate(), then it prints the first page correctly, but all other pages are blank. I tried re-scaling the painter when x == 45, but that only hangs the program.

[jpn]

Ok, sorry for not paying enough attention. Forget about saving and restoring for now. Seems I didn't read your code carefully enough. I somehow thought you were calling the print function for every page...

What I'm suspecting is that the areas returned by the visualRect(idx) don't match on the second page because it's not aware of that you have requested a new page and the coordinates have been reseted. So you would have to translate the painter in vertical direction after every new page request. Try to print the pageRect and the visualRects in the debug output or something and you'll see.

[derrickbj]

J-P,

You have NOTHING to apologize for!! You've been very helpful.

That's EXACTLY what needed to be done!!! I ran visualRect through qDebug() after every page and found that y() was incrementing by 1350. I also found out that after printing 45 rows, option.rect.x() was 1000 and not 0. So, I did painter->translate(0, -1350) after calling printer->newPage() and everything prints beautifully. I can't thank you enough for your help!! I was really appreciate it!

void PrintTableView::printTable(QPrinter* printer, QPainter* painter, const QRect& area)
{
	const int rows = model()->rowCount();
	const int columns = model()->columnCount();
	double totalWidth = 0.0;
	double totalPageHeight = 0.0;
	double totalHeight = 0.0;
	for (int c = 0; c < columns; ++c)
	{
		totalWidth += columnWidth(c);
	}
 
	for (int p = 0; p < 45; ++p)
	{
		totalPageHeight += rowHeight(p);
	}
 
	for (int r = 0; r<rows; ++r)
	{
		totalHeight += rowHeight(r);
	}
 
	const double xscale = area.width() / totalWidth;
	const double yscale = area.height() / totalHeight; 
	const double pscale = area.height() / totalPageHeight;
	painter->scale(xscale, pscale);
	painter->translate(area.x() + xscale, area.y() + yscale);
 
	bool ok;
	int x=0;
	QStyleOptionViewItem option;
 
	for (int r = 0; r < rows; ++r) {
		++x;
		for (int c = 0; c < columns; ++c) {
			QModelIndex idx = model()->index(r,c);
			option = viewOptions();
			option.rect = visualRect(idx);
			itemDelegate()->paint(painter, option, idx);
		}
		if (x == 45)
		{
			ok = printer->newPage();
			x=0;
			painter->translate(0, -1350);
		} 
	}	
}

void PrintTableView::printTable(QPrinter* printer, QPainter* painter, const QRect& area)
{
	const int rows = model()->rowCount();
	const int columns = model()->columnCount();
	double totalWidth = 0.0;
	double totalPageHeight = 0.0;
	double totalHeight = 0.0;
	for (int c = 0; c < columns; ++c)
	{
		totalWidth += columnWidth(c);
	}
		
	for (int p = 0; p < 45; ++p)
	{
		totalPageHeight += rowHeight(p);
	}
		
	for (int r = 0; r<rows; ++r)
	{
		totalHeight += rowHeight(r);
	}
		
	const double xscale = area.width() / totalWidth;
	const double yscale = area.height() / totalHeight; 
	const double pscale = area.height() / totalPageHeight;
	painter->scale(xscale, pscale);
	painter->translate(area.x() + xscale, area.y() + yscale);
		
	bool ok;
	int x=0;
	QStyleOptionViewItem option;
	
	for (int r = 0; r < rows; ++r) {
		++x;
		for (int c = 0; c < columns; ++c) {
			QModelIndex idx = model()->index(r,c);
			option = viewOptions();
			option.rect = visualRect(idx);
			itemDelegate()->paint(painter, option, idx);
		}
		if (x == 45)
		{
			ok = printer->newPage();
			x=0;
			painter->translate(0, -1350);
		} 
	}	
}

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[xelag]

I don't understand what to do before calling the function and what to set before for the three arguments :

void PrintTableView::printTable(QPrinter* printer, QPainter* painter, const QRect& area)

void PrintTableView::printTable(QPrinter* printer, QPainter* painter, const QRect& area)

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Do we call it from the mainwindow?

What to do to print? Where is the line to print our QTableView? As the line used in the post from jpn the 29th September 2006 22:43 with :

//[...]
painter.drawPixmap( const QRect & target, const QPixmap & pixmap, const QRect & source )
//[...]

//[...]
painter.drawPixmap( const QRect & target, const QPixmap & pixmap, const QRect & source )
//[...]

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Can you put the entire code on-line please with what to be done before and after the function printTable to print a QTableWidget. I am beginner with Qt and i need some full code example...

Thank you for your help.
Alex