How to print the same header on multiple pages

[ChrisW67]

Something like this:

#include <QtGui>
#include <QDebug>
 
static const QString header("This is the\nheader\ntext, but you can render anything here");
static const QString footer("This is the\nfooter\ntext");
 
int renderHeader(QPainter &painter) 
{
    painter.save();
    painter.resetTransform();
    painter.setFont(QFont("Courier New", 12));
    QRect boundingRect = painter.boundingRect(painter.window(), Qt::AlignJustify | Qt::TextWordWrap, header);
    painter.drawText(boundingRect, Qt::AlignJustify | Qt::TextWordWrap, header);
    painter.drawRect(boundingRect);
    painter.restore();
    return boundingRect.height();
}
 
int renderFooter(QPainter &painter) 
{
    painter.save();
    painter.resetTransform();
    painter.setFont(QFont("Courier New", 12));
    QRect boundingRect = painter.boundingRect(painter.window(), Qt::AlignJustify | Qt::TextWordWrap, footer);
    painter.translate(0, painter.window().height() - boundingRect.height());
    painter.drawText(boundingRect, Qt::AlignJustify | Qt::TextWordWrap, footer);
    painter.drawRect(boundingRect);
    painter.restore();
    return boundingRect.height();
}
 
 
 
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
 
 
QPrinter printer;
QPrintDialog dialog(&printer);
dialog.setWindowTitle("Print Document");
 
if (dialog.exec() == QDialog::Accepted) {
        QPainter painter;
        QString lorem = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc quis augue erat.";
 
    if (painter.begin(&printer)) {
        int position = 0;
 
        // Render the first header and footer
        int headerHeight = renderHeader(painter);
        int footerHeight = renderFooter(painter);
 
        position = headerHeight;
        painter.translate(0, headerHeight); // I use the translation to avoid doing it manually
 
        for (int i = 0; i < 40; ++i) {
            painter.setFont(QFont("Arial", i));
            QRect boundingRect = painter.boundingRect(painter.window(), 
                Qt::AlignJustify | Qt::TextWordWrap, 
                QString::number(i, 10) + ") " + lorem);
 
            // if our height is equal or greater than height of the page we introduce page break
            if( position + boundingRect.height() + footerHeight > painter.window().height() ) {
                printer.newPage();
                headerHeight = renderHeader(painter);
                footerHeight = renderFooter(painter);
                position = headerHeight;
                painter.resetTransform();
                painter.translate(0, headerHeight);
            }
 
            // write our text
            painter.drawText(boundingRect, 
                Qt::AlignJustify | Qt::TextWordWrap, 
                QString::number(i, 10) + ") " + lorem);
            painter.translate(0, boundingRect.height());
            position += boundingRect.height();
        }
 
        painter.end();
    }
}
 
    return 0;
 
}

#include <QtGui>
#include <QDebug>

static const QString header("This is the\nheader\ntext, but you can render anything here");
static const QString footer("This is the\nfooter\ntext");

int renderHeader(QPainter &painter) 
{
    painter.save();
    painter.resetTransform();
    painter.setFont(QFont("Courier New", 12));
    QRect boundingRect = painter.boundingRect(painter.window(), Qt::AlignJustify | Qt::TextWordWrap, header);
    painter.drawText(boundingRect, Qt::AlignJustify | Qt::TextWordWrap, header);
    painter.drawRect(boundingRect);
    painter.restore();
    return boundingRect.height();
}

int renderFooter(QPainter &painter) 
{
    painter.save();
    painter.resetTransform();
    painter.setFont(QFont("Courier New", 12));
    QRect boundingRect = painter.boundingRect(painter.window(), Qt::AlignJustify | Qt::TextWordWrap, footer);
    painter.translate(0, painter.window().height() - boundingRect.height());
    painter.drawText(boundingRect, Qt::AlignJustify | Qt::TextWordWrap, footer);
    painter.drawRect(boundingRect);
    painter.restore();
    return boundingRect.height();
}



int main(int argc, char *argv[])
{
    QApplication app(argc, argv);


QPrinter printer;
QPrintDialog dialog(&printer);
dialog.setWindowTitle("Print Document");

if (dialog.exec() == QDialog::Accepted) {
        QPainter painter;
        QString lorem = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nunc quis augue erat.";
    
    if (painter.begin(&printer)) {
        int position = 0;
        
        // Render the first header and footer
        int headerHeight = renderHeader(painter);
        int footerHeight = renderFooter(painter);

        position = headerHeight;
        painter.translate(0, headerHeight); // I use the translation to avoid doing it manually

        for (int i = 0; i < 40; ++i) {
            painter.setFont(QFont("Arial", i));
            QRect boundingRect = painter.boundingRect(painter.window(), 
                Qt::AlignJustify | Qt::TextWordWrap, 
                QString::number(i, 10) + ") " + lorem);

            // if our height is equal or greater than height of the page we introduce page break
            if( position + boundingRect.height() + footerHeight > painter.window().height() ) {
                printer.newPage();
                headerHeight = renderHeader(painter);
                footerHeight = renderFooter(painter);
                position = headerHeight;
                painter.resetTransform();
                painter.translate(0, headerHeight);
            }

            // write our text
            painter.drawText(boundingRect, 
                Qt::AlignJustify | Qt::TextWordWrap, 
                QString::number(i, 10) + ") " + lorem);
            painter.translate(0, boundingRect.height());
            position += boundingRect.height();
        }

        painter.end();
    }
}

    return 0;

}

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[omci]

Thank you for this demo, it is just what I needed. I read about save(), restore(), but did not know how to use them. Thank you also for showing me translate(), again it was a mystery for me. This will reduce my app for several thousand lines of code and make it useful again
Regards; Luka