Delegate hyperlink

[migel]

Hi

I am using below code to draw an html. I need to display text in the item as link, once clicked on a text (not on the item it self) it perform some action. I was using setIndexWidget and QLabel but performance is pretty bad.

An here the question how to make a text clickable ( not the item) to behave like an html link.

Possible ? thanks for help

QSize HyperLinkDelegate::sizeHint(const QStyleOptionViewItem &  option ,
                                  const QModelIndex & index) const
{
    QStyleOptionViewItemV4 optionV4 = option;
    initStyleOption(&optionV4, index);
 
    QTextDocument doc;
    doc.setHtml(optionV4.text);
    doc.setTextWidth(optionV4.rect.width());
    return QSize(doc.idealWidth(), doc.size().height());
}
 
void HyperLinkDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                              const QModelIndex &index) const
{
    QStyleOptionViewItemV4 optionV4 = option;
    initStyleOption(&optionV4, index);
 
    QStyle *style = optionV4.widget? optionV4.widget->style() : QApplication::style();
 
    QTextDocument doc;
    doc.setHtml(optionV4.text);
 
    // Painting item without text
    optionV4.text = QString();
    style->drawControl(QStyle::CE_ItemViewItem, &optionV4, painter);
 
    QAbstractTextDocumentLayout::PaintContext ctx;
 
    // Highlighting text if item is selected
    if (optionV4.state & QStyle::State_Selected)
        ctx.palette.setColor(QPalette::Text, optionV4.palette.color(QPalette::Active, QPalette::HighlightedText));
 
    QRect textRect = style->subElementRect(QStyle::SE_ItemViewItemText, &optionV4);
    painter->save();
    painter->translate(textRect.topLeft());
    painter->setClipRect(textRect.translated(-textRect.topLeft()));
    doc.documentLayout()->draw(painter, ctx);
    painter->restore();
 
}

QSize HyperLinkDelegate::sizeHint(const QStyleOptionViewItem &  option ,
                                  const QModelIndex & index) const
{
    QStyleOptionViewItemV4 optionV4 = option;
    initStyleOption(&optionV4, index);
    
    QTextDocument doc;
    doc.setHtml(optionV4.text);
    doc.setTextWidth(optionV4.rect.width());
    return QSize(doc.idealWidth(), doc.size().height());
}

void HyperLinkDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
                              const QModelIndex &index) const
{
    QStyleOptionViewItemV4 optionV4 = option;
    initStyleOption(&optionV4, index);
    
    QStyle *style = optionV4.widget? optionV4.widget->style() : QApplication::style();
    
    QTextDocument doc;
    doc.setHtml(optionV4.text);
    
    // Painting item without text
    optionV4.text = QString();
    style->drawControl(QStyle::CE_ItemViewItem, &optionV4, painter);
    
    QAbstractTextDocumentLayout::PaintContext ctx;
    
    // Highlighting text if item is selected
    if (optionV4.state & QStyle::State_Selected)
        ctx.palette.setColor(QPalette::Text, optionV4.palette.color(QPalette::Active, QPalette::HighlightedText));
    
    QRect textRect = style->subElementRect(QStyle::SE_ItemViewItemText, &optionV4);
    painter->save();
    painter->translate(textRect.topLeft());
    painter->setClipRect(textRect.translated(-textRect.topLeft()));
    doc.documentLayout()->draw(painter, ctx);
    painter->restore();
    
}

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[wysota]

There are no magic two lines of code you can call and have the job done. You have to calculate the geometry of the link and provide event handlers for the mouse that will 1) change the cursor when it is over the link and 2) execute the action when the link is clicked.