QStandardItem : subpart of the text as bold

[titoo]

how to bold a part of the text of a QStandardItem ?
atm i see that i can choose the font of the whole text, is this possible to change only a part of the font of the text ?

[wysota]

I take it that you ask how to bold a fragment of data in the view... The answer is to provide a custom delegate that can handle rich text.

[titoo]

i then need to create a qtextedit when i enter in QItemDelegate:: paint(...) ?

[wysota]

No. Use QTextLayout or something simmilar... I did it like this:

void CommentDelegate::paint( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const
{
    painter->save();
    QTextDocument doc;
    doc.setHtml( index.data().toString() );
    QAbstractTextDocumentLayout::PaintContext context;
    doc.setPageSize( option.rect.size());
    painter->translate(option.rect.x(), option.rect.y());
    doc.documentLayout()->draw(painter, context);
    painter->restore();
}

void CommentDelegate::paint( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const
{
    painter->save();
    QTextDocument doc;
    doc.setHtml( index.data().toString() );
    QAbstractTextDocumentLayout::PaintContext context;
    doc.setPageSize( option.rect.size());
    painter->translate(option.rect.x(), option.rect.y());
    doc.documentLayout()->draw(painter, context);
    painter->restore();
}

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[Georgest]

Need to add a line:

painter->setClipRect(option.rect);

painter->setClipRect(option.rect);

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before painter->translate(...)
to avoid drawing text lines outside of the cell.
And highlight a focus cell changing background colour of text or with fillRect():

if (option.state & QStyle::State_Selected)
         painter->fillRect(option.rect, option.palette.highlight());

if (option.state & QStyle::State_Selected)
         painter->fillRect(option.rect, option.palette.highlight());

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And change colour of highlighted text.
For example:

void MyDelegate::paint ( 
            QPainter *painter, 
            const QStyleOptionViewItem& option, 
            const QModelIndex& index ) const {
 
    QString text;
    QRect rect; 
    QVariant value;
    QStyleOptionViewItemV4 opt = setOptions(index, option); // or V2 for Qt4.2
 
    //value = index.data(Qt::DisplayRole);
    //text = value.toString();
    //opt.displayAlignment = Qt::AlignRight | Qt::AlignVCenter;
    //drawDisplay(painter, opt, opt.rect, text);
 
    // Change line style around of the cell:
    QPen pen = QPen(Qt::red, 1, Qt::DashLine, 
                    Qt::FlatCap, Qt::MiterJoin);
    painter->setPen(pen);
    painter->drawLine(opt.rect.left(), opt.rect.bottom()+1,
                      opt.rect.right(), opt.rect.bottom()+1);
    painter->drawLine(opt.rect.right()+1, opt.rect.top(),
                      opt.rect.right()+1, opt.rect.bottom());
 
    // draw rich text:
    painter->save();
    QTextDocument doc;
    doc.setHtml( index.data().toString() );
    QAbstractTextDocumentLayout::PaintContext context;
    doc.setPageSize( option.rect.size());
    painter->setClipRect(option.rect);
    painter->translate(option.rect.x(), option.rect.y());
 
    //if (option.state & QStyle::State_Selected)
        //painter->setBrush(option.palette.highlightedText());
 
    doc.documentLayout()->draw(painter, context);
    //doc.drawContents(painter, option.rect);
    painter->restore();
 
    // draw focus:
    if (option.state & QStyle::State_Selected){
        QPalette pal=option.palette;
        QBrush brush = pal.highlight();
        QColor col = brush.color(); 
        col.setAlpha(127);
        brush.setColor(col); 
        painter->fillRect(option.rect, brush);
        //painter->fillRect(option.rect, option.palette.highlight());
    }
}

void MyDelegate::paint ( 
            QPainter *painter, 
            const QStyleOptionViewItem& option, 
            const QModelIndex& index ) const {

    QString text;
    QRect rect; 
    QVariant value;
    QStyleOptionViewItemV4 opt = setOptions(index, option); // or V2 for Qt4.2

    //value = index.data(Qt::DisplayRole);
    //text = value.toString();
    //opt.displayAlignment = Qt::AlignRight | Qt::AlignVCenter;
    //drawDisplay(painter, opt, opt.rect, text);
    
    // Change line style around of the cell:
    QPen pen = QPen(Qt::red, 1, Qt::DashLine, 
                    Qt::FlatCap, Qt::MiterJoin);
    painter->setPen(pen);
    painter->drawLine(opt.rect.left(), opt.rect.bottom()+1,
                      opt.rect.right(), opt.rect.bottom()+1);
    painter->drawLine(opt.rect.right()+1, opt.rect.top(),
                      opt.rect.right()+1, opt.rect.bottom());

    // draw rich text:
    painter->save();
    QTextDocument doc;
    doc.setHtml( index.data().toString() );
    QAbstractTextDocumentLayout::PaintContext context;
    doc.setPageSize( option.rect.size());
    painter->setClipRect(option.rect);
    painter->translate(option.rect.x(), option.rect.y());
    
    //if (option.state & QStyle::State_Selected)
        //painter->setBrush(option.palette.highlightedText());
    
    doc.documentLayout()->draw(painter, context);
    //doc.drawContents(painter, option.rect);
    painter->restore();
    
    // draw focus:
    if (option.state & QStyle::State_Selected){
        QPalette pal=option.palette;
        QBrush brush = pal.highlight();
        QColor col = brush.color(); 
        col.setAlpha(127);
        brush.setColor(col); 
        painter->fillRect(option.rect, brush);
        //painter->fillRect(option.rect, option.palette.highlight());
    }
}

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[huyhoangfool]

To QTableWidget, I derive paint() function of QItemDelegate like this:

void TableWidgetItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
           const QModelIndex &index) const
{
    painter->save();
 
    QFont font = qvariant_cast<QFont>(index.data(Qt::FontRole));
    painter->setFont(font);
    painter->drawStaticText(option.rect.x(),option.rect.y(), QStaticText(index.data().toString()));
 
    painter->restore();
}

void TableWidgetItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
           const QModelIndex &index) const
{
    painter->save();

    QFont font = qvariant_cast<QFont>(index.data(Qt::FontRole));
    painter->setFont(font);
    painter->drawStaticText(option.rect.x(),option.rect.y(), QStaticText(index.data().toString()));

    painter->restore();
}

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_ Draw rich text with Qt::AlignCenter:

void TableWidgetItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
           const QModelIndex &index) const
{
    QFont font = qvariant_cast<QFont>(index.data(Qt::FontRole));
    QBrush brush = qvariant_cast<QBrush>(index.data(Qt::ForegroundRole));
 
    QFontMetrics fm(font);
    QRect boundingRect = fm.boundingRect(index.data().toString().remove("<sub>").remove("</sub>")); //We can remove other html tags
    int stringWidth = boundingRect.width();
    int stringHeight = boundingRect.height();
 
    int xPoint = option.rect.x() + option.rect.width()/2 - stringWidth/2;
    int yPoint = option.rect.y() + option.rect.height()/2 - stringHeight/2;
 
    painter->save();
 
    painter->setFont(font);
    painter->setPen(brush.color());
    painter->drawStaticText(xPoint , yPoint, QStaticText(index.data().toString()));
}

void TableWidgetItemDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
           const QModelIndex &index) const
{
    QFont font = qvariant_cast<QFont>(index.data(Qt::FontRole));
    QBrush brush = qvariant_cast<QBrush>(index.data(Qt::ForegroundRole));

    QFontMetrics fm(font);
    QRect boundingRect = fm.boundingRect(index.data().toString().remove("<sub>").remove("</sub>")); //We can remove other html tags
    int stringWidth = boundingRect.width();
    int stringHeight = boundingRect.height();

    int xPoint = option.rect.x() + option.rect.width()/2 - stringWidth/2;
    int yPoint = option.rect.y() + option.rect.height()/2 - stringHeight/2;

    painter->save();

    painter->setFont(font);
    painter->setPen(brush.color());
    painter->drawStaticText(xPoint , yPoint, QStaticText(index.data().toString()));
}

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Regards.