QFileDialog view folders and files but select folders only?

Question

I'm creating my own custom file dialog using the following code:

file_dialog = QtGui.QFileDialog()
file_dialog.setFileMode(QtGui.QFileDialog.Directory)
file_dialog.setViewMode(QtGui.QFileDialog.Detail)
file_dialog.setOption(QtGui.QFileDialog.DontUseNativeDialog, True)

The behaviour that i'm interested in is for the user to be able to view both files and folders, but select folders only. (making files unselectable). Is that possible?

Note: Using the DirectoryOnly option is not good for me since it doesn't allow you to view files, just folders.

Edit (extra code that i forgot to add which responsible for being able to select multiple folders instead of just one):

file_view = file_dialog.findChild(QtGui.QListView, 'listView')
if file_view:
    file_view.setSelectionMode(QtGui.QAbstractItemView.MultiSelection)
f_tree_view = file_dialog.findChild(QtGui.QTreeView)
if f_tree_view:
    f_tree_view.setSelectionMode(QtGui.QAbstractItemView.MultiSelection)

Answer 1

To prevent files being selected, you can install a proxy model which manipulates the flags for items in the file-view:

class ProxyModel(QtGui.QIdentityProxyModel):
    def flags(self, index):
        flags = super(ProxyModel, self).flags(index)
        if not self.sourceModel().isDir(index):
            flags &= ~QtCore.Qt.ItemIsSelectable
        return flags


# keep a reference somewhere to prevent core-dumps on exit
self._proxy = ProxyModel(self)

file_dialog.setProxyModel(self._proxy)