how to add icons to QTreeWidget?

[jpn]

QVariant YourModel::data(const QModelIndex &index, int role) const
{
    ...
    switch (role)
    {
        ...
        case Qt::DecorationRole: // <---
            return QIcon(...); // <---
        ...
    }
    ...
}

QVariant YourModel::data(const QModelIndex &index, int role) const
{
    ...
    switch (role)
    {
        ...
        case Qt::DecorationRole: // <---
            return QIcon(...); // <---
        ...
    }
    ...
}

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