QPrinter pages not breakering

[scarecr0w132]

Hello,

I am generating a QTextTableand inserting it into a QTextDocument and printing to PDF.
The table is not automatically split and the next page is not generated.
Here is the code:

...
void MainWindow::generatePdf()
{
    QPrinter printer;
    QPainter painter;
 
    QString pdfFile = QFileDialog::getSaveFileName(this);
    printer.setOutputFormat(QPrinter::PdfFormat);
    printer.setOutputFileName(pdfFile);
    printer.setPageSize(QPrinter::A4);
    printer.setPageMargins (15,15,15,15,QPrinter::Millimeter);
 
    painter.begin(&printer);
 
    QTextEdit *editor = new QTextEdit();
    QTextDocument *document = new QTextDocument(editor);
    QTextCursor cursor(document);
 
    QTextTable *table = cursor.insertTable(100, 1);
    cursor.insertText("test");
    for(int i = 0; i < table->rows() - 1; i++) {
        cursor = table->cellAt(i + 1, 0).firstCursorPosition();
        cursor.insertText("Row : " + QString::number(i + 1));
    }
 
    document->drawContents(&painter);
    painter.end();
}
...

...
void MainWindow::generatePdf()
{
    QPrinter printer;
    QPainter painter;

    QString pdfFile = QFileDialog::getSaveFileName(this);
    printer.setOutputFormat(QPrinter::PdfFormat);
    printer.setOutputFileName(pdfFile);
    printer.setPageSize(QPrinter::A4);
    printer.setPageMargins (15,15,15,15,QPrinter::Millimeter);

    painter.begin(&printer);

    QTextEdit *editor = new QTextEdit();
    QTextDocument *document = new QTextDocument(editor);
    QTextCursor cursor(document);

    QTextTable *table = cursor.insertTable(100, 1);
    cursor.insertText("test");
    for(int i = 0; i < table->rows() - 1; i++) {
        cursor = table->cellAt(i + 1, 0).firstCursorPosition();
        cursor.insertText("Row : " + QString::number(i + 1));
    }

    document->drawContents(&painter);
    painter.end();
}
...

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How can this be fixed?
I have attachment the generate PDF file.

Thank you

[ChrisW67]

You have chosen to paint the QTextDocument directly. You get to do the pagination yourself.

See QTextDocument::print()

[scarecr0w132]

You have chosen to paint the QTextDocument directly. You get to do the pagination yourself.

See QTextDocument::print()

Hello ChrisW67,
I chose to paint the QTextDocument directly because it is a requirement for QPrinter::newPage();
It would be nice to have a signal for when the QTextDocument would paginate itself....
Thanks

[ChrisW67]

I chose to paint the QTextDocument directly because it is a requirement for QPrinter::newPage();

If you want QTextDocument to paginate and render itself to a printer then use QTextDocument::print(). If you want to control page breaks yourself, or do things like headers/footers or multiple pages per sheet, then use drawContents() and call newPage() yourself. It's not too difficult, something like:

printer->setPageMargins(15, 15, 15, 15, QPrinter::Millimeter);
const QRect pageRect = printer->pageRect();
 
// Give the document the correct left-to-right width for word wrapping etc
doc.setPageSize(pageRect.size()); 
 
// The total extent of the content (there are no page margin in this)
QRect contentRect = QRect(QPoint(0, 0), doc.size().toSize());
 
// This is the part of the content we will drop on a page.  It's a sliding window on the content.
QRect currentRect(0, 0, pageRect.width(), pageRect.height());
 
QPainter painter(printer);
while (currentRect.intersects(contentRect)) {
        painter.save();
        painter.translate(0, -currentRect.y());
        doc.drawContents(&painter, currentRect);  // draws part of the document
        painter.restore();
 
        // Translate the current rectangle to the area to be printed for the next page
        currentRect.translate(0, currentRect.height());
 
        //Inserting a new page if there is still area left to be printed
        if (currentRect.intersects(contentRect))
            printer->newPage();
}

printer->setPageMargins(15, 15, 15, 15, QPrinter::Millimeter);
const QRect pageRect = printer->pageRect();

// Give the document the correct left-to-right width for word wrapping etc
doc.setPageSize(pageRect.size()); 

// The total extent of the content (there are no page margin in this)
QRect contentRect = QRect(QPoint(0, 0), doc.size().toSize());

// This is the part of the content we will drop on a page.  It's a sliding window on the content.
QRect currentRect(0, 0, pageRect.width(), pageRect.height());

QPainter painter(printer);
while (currentRect.intersects(contentRect)) {
        painter.save();
        painter.translate(0, -currentRect.y());
        doc.drawContents(&painter, currentRect);  // draws part of the document
        painter.restore();

        // Translate the current rectangle to the area to be printed for the next page
        currentRect.translate(0, currentRect.height());

        //Inserting a new page if there is still area left to be printed
        if (currentRect.intersects(contentRect))
            printer->newPage();
}

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It would be nice to have a signal for when the QTextDocument would paginate itself....

If you are using QTextDocument::drawContents() then the QTextDocument does not dictate where page breaks go.