Print preview of a QWidget

[Ponnytail]

Hi,

My goal is to create a print preview function which allows users to see the crossword they've created as it would appear on a piece of paper. Reading the documentation I thought this would be a piece of cake. Here's what I've got so far (taken from the documentation describing how to print a widget):

void MyWindow::filePrintPreview()
{
    QPrinter printer;
    QPainter painter;
    painter.begin(&printer);
    double xscale = printer.pageRect().width()/double(cwArea->width());
    double yscale = printer.pageRect().height()/double(cwArea->height());
    double scale = qMin(xscale, yscale);
    painter.translate(printer.paperRect().x() + printer.pageRect().width()/2,
                      printer.paperRect().y() + printer.pageRect().height()/2);
    painter.scale(scale, scale);
    painter.translate(-width()/2, -height()/2);
    cwArea->render(&painter);
    QPrintPreviewDialog preview(&printer, this);
    connect(&preview, SIGNAL(paintRequested(QPrinter*)), SLOT(print(QPrinter*)));
    preview.exec();
}

void MyWindow::filePrintPreview()
{
    QPrinter printer;
    QPainter painter;
    painter.begin(&printer);
    double xscale = printer.pageRect().width()/double(cwArea->width());
    double yscale = printer.pageRect().height()/double(cwArea->height());
    double scale = qMin(xscale, yscale);
    painter.translate(printer.paperRect().x() + printer.pageRect().width()/2,
                      printer.paperRect().y() + printer.pageRect().height()/2);
    painter.scale(scale, scale);
    painter.translate(-width()/2, -height()/2);
    cwArea->render(&painter);
    QPrintPreviewDialog preview(&printer, this);
    connect(&preview, SIGNAL(paintRequested(QPrinter*)), SLOT(print(QPrinter*)));
    preview.exec();
}

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MyWindow is my QMainWindow and filePrintPreview() is the slot called when "file->print preview" is triggered.
cwArea is the widget containing the crossword squares.

I read that if I want to render the contents of a widget, these contents have to be children of the widget itself. Since each crossword square is an overridden QTextEdit I added an optional parent parameter to each of the constructors...

Tile::Tile(..., QWidget *parent)
{
(...)
}

Tile::Tile(..., QWidget *parent)
{
(...)
}

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...and let the crossword widget be each square's parent. For example:

for(int i = 0; i < rows; i++)
    {
        for(int j = 0; j < columns; j++)
        {
            cwlayout->addWidget(new Tile(...,this),i*4,j*4,4,4);
        }
    }

for(int i = 0; i < rows; i++)
    {
        for(int j = 0; j < columns; j++)
        {
            cwlayout->addWidget(new Tile(...,this),i*4,j*4,4,4);
        }
    }

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Unfortunately all I've managed to preview so far is absolutely nothing.
What have I done wrong? Is it a problem when the child widgets of the widget I wish to print are QTextEdits?

Thanks in advance!