How to hide dotted lines in QTreeWidget

Question

Qt. QTreeWidget. How to hide dotted lines?

Answer 1

If this indeed is about the branches (the question is not very clear), then QTreeView (and thus QTreeWidget) has a special function to do just that (since Qt 4.2):

treeWidget->setRootIsDecorated(false);

Answer 2

If you're talking about the branch lines on the left of the tree, try setting a stylesheet as such :

treeWidget->setStyleSheet(QString("QTreeView::branch { border-image: none; }"));