Add QSpinBox to a child of QTreeWidgetItem

Question

I know how to add a QSpinBox to a QTreeWidgetItem :

_spin_speed = new QSpinBox();
ui->treeWidget->setItemWidget(ui->treeWidget->topLevelItem(0) , 1 , _spin_sizePicture);

But how to add a QSpinBox to a child of QTreeWidgetItem? By "child" I mean this Item in particular :

I tried this but it doesn't work :

 _spin_angle = new QSpinBox();    
 ui->treeWidget->setItemWidget(ui->treeWidget->topLevelItem(2)->treeWidget()->topLevelItem(0) , 1 , _spin_angle);

Thanks for your time, and have a great day !

Answer 1

topLevelItem() gets a top level item. What you need is child():

 ui->treeWidget->setItemWidget(ui->treeWidget->topLevelItem(2)->child(0) , 1 , _spin_angle);