QFileDialog for directories that have certain content

Question

I would like to build a dialog similar to QFileDialog::getExistingDirectory() for which the OK-button only is enabled when the selected directory contains certain files.

I know I cannot achieve this with QFileDialog, instead I would have to come up with my own QDialog that has a QTreeView coupled to a QFileSystemModel.

1. How can I limit the QTreeView to directories?
2. How can I get the currently selected directory so I can check whether it contains some filenames?

Answer 1

1. Use setFilter on the QFileSystemModel with either the QDir::AllDirs or QDir::Dirs option, probably the former.
2. connect the activated(QModelIndex) signal from the treeview to a custom slot of yours. In this slot pass the QModelIndex to the model's fileInfo/filePath method, to retrieve the info/path for the selected directory, then perform your check

Here is an example:

void slotDirectorySelected( const QModelIndex & index )
{
    QFileInfo info = fileSystemModel->fileInfo( index );
    QDir selectedDir = info.dir();
    foreach( const QString entry, selectedDir.entryList() ) {
        // do something with the entry
    }
}