Horizontal scroll bar on QTreeView

[wysota]

I see a stretchHeaderLastSection, and that's checked.

Switch it off.

But I don't have a header, do I need one?

With a tree view you always have a header, it might not be visible though.

I don't see a stretchLastColumn property or resize policies for individual columns - I must be looking in the wrong place, where do I find those?

In the docs of QHeaderView

I set the resizeColumnToContents(0)

Bad idea.

[LynneV]

The solution ended up to be: QStandardItemModel->SetHorizontalHeaderLabels( QStringList) AND QTreeView->setColumnWidth( 0, line_width ). Ether alone would not work..but together they do the trick! Why is resizeColumntoContents not a good idea? Just curious.

[wysota]

Why is resizeColumntoContents not a good idea?

Because you are probably calling it before the sizes are calculated so it's likely a no-op.