Hey Robert,
When using a QTreeView, you have to control the row height by setting a custom QItemDelegate on the view:
http://qt-project.org/doc/qt-4.8/qabstractitemview.html#setItemDelegate
This QItemDelegate can have a custom sizeHint which let's you choose how big it should be given a current state. But you could just return a constant size
http://qt-project.org/doc/qt-4.8/qabstractitemdelegate.html#sizeHint
Its a little more obscure with model/view than with the convenience widgets like QTreeWidget. With that widget, you control the size via QTreeWidgetItems
Let me know if you need more specific examples (answering via mobile now)
- justin