QListWidget delegate

Can anyone help me with some custom delegate for QListWidget. I want fust when i expand some item to show its children under top item aligned to left (like QComboBox has). Remain scrollbars etc. Only to remove indentation of items.
I have already tryed to make custom delegate with various changes but nothing works yet, which property should i change...
Thanks very much.

I have tried :

Code:

---

void paint(QPainter *painter,
               const QStyleOptionViewItem &option,
               const QModelIndex &index) const override {
 
        if(index.child(0, 0).isValid()) {
            QStyleOptionViewItem viewOptions;
            viewOptions.rect = option.rect;
            viewOptions.displayAlignment = Qt::AlignLeft;
            viewOptions.decorationAlignment = Qt::AlignLeft;
            viewOptions.viewItemPosition = QStyleOptionViewItem::Beginning;
            viewOptions.decorationPosition = QStyleOptionViewItem::Left;
            viewOptions.textElideMode = Qt::ElideLeft;
            QApplication::style()->drawControl(QStyle::CE_PushButton, &viewOptions, painter);
 
        }
        QItemDelegate::paint(painter, option, index);
    }

---

but children item padding is still indented