How can I make the items in QTreeWidget expanded by default?

Question

I have to call expandAll() in the constructor, but that looks unnecessary,

The stuff I've added in form editor was just collapsed, and I failed to find an property in the right box, how should I make it all expanded by default?

Answer 1

You can write your own function to add items and then use it to fill the tree:

void addRootNode(const QString& value) {
    QTreeWidgetItem* treeItem = new QTreeWidgetItem();
    treeItem->setText(value);
    ui->treeWidget->addTopLevelItem(treeItem);
    ui->treeWidget->expandItem(treeItem);
}