QTreeView/QDirModel persisting current directory selection

Hi, I am trying to work out how to persist the current selection in a QDirModel/QTreeView using QSettings so that I can expand the tree to that directory when the app restarts.

I am using Qt 4.3.4.

QTreeView does not appear to support saveState()/restoreState() so I guess I have to write a string URL for the currentItem() in the tree to QSettings and retrieve it later. In this case how do I convert from a string URL into a QModelItem in the View/Model?

Is there a better way to use the built in mechanisms than the one I've outlined above? I already use QSettings to persist QApplication state and table header state but I can't see any built in mechanism for doing this on a tree.

Thanks
Dave

With QDirModel it is quite simple. Store the path in the settings and then upon initializing the application simply read it and expand its parents.

Just to close this off I found a reasonable solution.
Calling setCurrentIndex() expands to the selected node.
Calling setExpanded() expands the selected node too.

Code:

---

class DirectoryTree : public QTreeView
{
public:
    void readSettings(QSettings& oSettings)
    {
        QString sLastSelection = oSettings.value("LastSelection").toString();
        if (!sLastSelection.isEmpty()) {
            QModelIndex index = m_oModel.index(sLastSelection);
            setCurrentIndex(index);
            setExpanded(index, true);
        }
    }
 
    void writeSettings(QSettings& oSettings) {
        oSettings.setValue("LastSelection", m_oModel.filePath(currentIndex()));
    }
 
protected:
    QDirModel& m_oModel;
};

---

cheers
Dave