const QAbstractProxyModel* proxyModel = static_cast<const QAbstractProxyModel*>(index.model());
const KDirModel* dirModel = static_cast<const KDirModel*>(proxyModel->sourceModel());
const QModelIndex dirIndex = proxyModel->mapToSource(index);
const QAbstractProxyModel* proxyModel = static_cast<const QAbstractProxyModel*>(index.model());
const KDirModel* dirModel = static_cast<const KDirModel*>(proxyModel->sourceModel());
const QModelIndex dirIndex = proxyModel->mapToSource(index);