I want to make checked Items in Bold Format in QT DOM Model. For the full code please follow the Git link. https://github.com/aviralarpit/QTreeView_with_XML

    QVariant DomModel::data(const QModelIndex &index, int role) const
{
    if (!index.isValid())
        return QVariant();

    DomItem *item = static_cast<DomItem*>(index.internalPointer());
    const QDomNode node = item->node();
    if ( role == Qt::CheckStateRole && (index.column() == 0) && hasChildren(index) )
        return static_cast< int >( item->isChecked() ? Qt::Checked : Qt::Unchecked );
    if (role != Qt::DisplayRole)
        return QVariant();

    switch (index.column()) {
        case 0:
            return node.nodeName();
        case 1:
        {
            const QDomNamedNodeMap attributeMap = node.attributes();
            QStringList attributes;
            for (int i = 0; i < attributeMap.count();   i) {
                QDomNode attribute = attributeMap.item(i);
                attributes << attribute.nodeName()   "=\""
                                attribute.nodeValue()   '"';
            }
            return attributes.join(' ');
        }
        case 2:
            return node.nodeValue().split('\n').join(' ');
        default:
            break;
    }
    return item->data(index.column());
}

Flag function

Qt::ItemFlags DomModel::flags(const QModelIndex &index) const
{
    if (!index.isValid())
        return Qt::NoItemFlags;
    Qt::ItemFlags flags = Qt::ItemIsEnabled | Qt::ItemIsSelectable;
    if ( index.column() == 0 )
        flags |= Qt::ItemIsUserCheckable;
    return flags;
}

setData function

bool DomModel::setData(const QModelIndex &index, const QVariant &value, int role) {
    DomItem *item = static_cast<DomItem*>(index.internalPointer());

    if (index.column() == 0 ){
        if (role == Qt::EditRole) {
            return false;
        }
        if (role == Qt::CheckStateRole) {
            item->setChecked(value.toBool());
            emit dataChanged(index, index);
            return true;
        }
    }
    return QAbstractItemModel::setData(index, value, role);
}

CodePudding user response：

In your data() function add a case for the Qt::FontRole item data role. Then just return a QFont instance that looks whathever you want it to look like, depending on the item's check state.

if (role == Qt::FontRole && item->isChecked()) {
        QFont font;
        font.setBold(true);
        return font;
}