QIrBreadCrumbBar is a QComboBox-based navigation aid to browse path through item data model similar to filesystem. As the screenshot shows, QIrBreadCrumBar works just fine with QDirModel. QIrBreadCrumbBar is part of QIron toolkit which depends on Qt 4.6 and upper. Like for most of QIron widgets, a plugin is provided to be used in Qt Designer.
A typical use of QIrBreadCrumbBar is:
QIrBreadCrumbBar * bar = new QIrBreadCrumbBar(this);