Qtreewidget

[spirit]

install event filter on a treewidget's viewport and process needed events.

...
m_treeWidget->viewport()->installEnvetFilter(this);
...
bool MyWidget::eventFilter(QObject *o, QEvent *e)
{
    if (m_treeWidget->viewport() == o) {
        if (e->type() == QEvent::MouseButtonPress) {
                const QMouseEvent *me = static_cast<QMouseEvent>(e);
                //add whatever you want
        } else if (e->type() == QEvent::FocusIn) {
                //add whatever you want
        }
    }
    return QWidget::eventFilter(o, e);
}

...
m_treeWidget->viewport()->installEnvetFilter(this);
...
bool MyWidget::eventFilter(QObject *o, QEvent *e)
{
    if (m_treeWidget->viewport() == o) {
        if (e->type() == QEvent::MouseButtonPress) {
                const QMouseEvent *me = static_cast<QMouseEvent>(e);
                //add whatever you want
        } else if (e->type() == QEvent::FocusIn) {
                //add whatever you want
        }
    }
    return QWidget::eventFilter(o, e);
}

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PS. please, ask questions like this in Newbie forum.