Create PDF with automatically new page (QTExtDocument, QTextCursor, ...)



  • Hello,

    Here a code which allow me te create a pdf with automatically add a new page :

    void Class1::addContent()
    {
        m_painter->setPen(Qt::green);
        m_painter->drawRect(m_rectContent);
    
        QTextDocument tdContent;
        QTextOption textOptionContent;
        textOptionContent.setAlignment(Qt::AlignJustify);
        textOptionContent.setWrapMode(QTextOption::WordWrap);
        tdContent.setDefaultTextOption(textOptionContent);
        tdContent.setTextWidth(m_writer->width());
    
        setContent(&tdContent, 0); 
    }
    
    void Class1::setContent(QTextDocument *doc, int beginPosition)
    {
        doc->clear();
        QString htmlText;
        m_cursor = new QTextCursor(doc);
        m_cursor->insertHtml(m_totalHtml);
        //m_html is my QString to print
    
        int lenTextToPrint = m_cursor->selectionEnd()-beginPosition;
    
        qDebug() << "   ";
        qDebug() << "============";
        qDebug() << "Page n°" << m_nbPage;
        qDebug() << "Initial text lenght" << m_cursor->selectionEnd();
        qDebug() << "Begin position" << beginPosition;
        qDebug() << "Text to print" << lenTextToPrint;
    
        if (beginPosition != 0)
        {
            m_cursor->setPosition(beginPosition-1);
            m_cursor->movePosition(QTextCursor::End, QTextCursor::KeepAnchor);
            htmlText = m_cursor->selection().toHtml();
            m_cursor->select(QTextCursor::Document);
            m_cursor->removeSelectedText();
            m_cursor->insertHtml(htmlText);
        }
        else {
            htmlText = m_totalHtml;
        }
    
        qDebug() << "Current TextDoc height" << doc->documentLayout()->documentSize().height();
        qDebug() << "Available per page" << m_rectContent.height();
    
        int actPosi = 0;
        if (doc->documentLayout()->documentSize().height() > m_rectContent.height()){
            doc->clear();
            while(doc->documentLayout()->documentSize().height() < m_rectContent.height())
            {
                QTextCursor *cursor = new QTextCursor(doc);
                cursor->insertHtml(htmlText);
                cursor->setPosition(actPosi);
                cursor->movePosition(QTextCursor::Down);
                actPosi = cursor->position();
    
                cursor->movePosition(QTextCursor::End, QTextCursor::KeepAnchor);
                cursor->removeSelectedText();
            }
            paintContent(doc);
    
            m_alreadyPaint += actPosi;
            qDebug() << "Last Position" << actPosi;
            qDebug() << "Already print" << m_alreadyPaint;
            if (actPosi < lenTextToPrint){
                newPage();
                setContent(doc, m_alreadyPaint);
            }
        }
        else {
            paintContent(doc);
        }
    }
    
    void Class1::paintContent(QTextDocument *doc)
    {
        m_painter->save();
        m_painter->translate(m_rectContent.topLeft());
        doc->drawContents(m_painter);
        m_painter->restore();
    }
    
    void Class1::print()
    {
        m_writer = new QPdfWriter(m_fileName);
        m_writer->setResolution(m_resolution);
        QPageSize pageSize(QPageSize::A4);
        QMarginsF margins(m_margins, m_margins, m_margins, m_margins);
        QPageLayout pageLayout(pageSize, QPageLayout::Portrait, margins, QPageLayout::Millimeter);
        m_writer->setPageLayout(pageLayout);
        m_nbPage = 1;
        m_heightAvailable = m_writer->height();
        m_rectContent.setCoords(0, 0, m_writer->width(), 0);
        m_painter = new QPainter(m_writer);
    
        addContent();
    }
    

    I have 2 questions :

    • Do you have any suggestions for improving my code or otherwise ?
    • Sometimes the new pages begin with a letter less to the first, have you an idea to fixe the issues ?

    You can test my code by downloading it here : https://github.com/jiyuusoft/QMLReports

    Thank you in advance for your help and comments.

    Charlie



  • I'm not sure I got what the end goal is. Are you trying to achieve something like this?



  • @VRonin
    Indeed this allows to simplify the code for the creation of the new pages automatically. However, I need to review how to handle headers and footers for each page. If it's simpler, why not ...


Log in to reply
 

Looks like your connection to Qt Forum was lost, please wait while we try to reconnect.