[Qt-interest] Select all indices in a QFileSystemModel ?

[Stephen Collyer]

I have a QTreeView whose model is a QFileSystemModel.
I want to be able to select all the files in the model. I have some
somewhat clunky code that tries to do this:

void CreateTransactionDlg::select_all_files()
{
    set_all_files_selection_state(QItemSelectionModel::Select,
                                  root_index_);
}

void CreateTransactionDlg::set_all_files_selection_state(const
QItemSelectionModel::SelectionFlags flags,
                                                         const QModelIndex&
parent)
{
    // select all at current level

    int row_count = dir_model_->rowCount(parent) - 1;

    QModelIndex top_left     = dir_model_->index(0, 0, parent);
    QModelIndex bottom_right = dir_model_->index(row_count, 0, parent);

    QItemSelection selection(top_left, bottom_right);

    QItemSelectionModel* selection_model = files_tree->selectionModel();
    selection_model->select(selection, flags);

    // recurse over children

    foreach (QModelIndex i, selection_model->selectedIndexes())
    {
        if (dir_model_->hasChildren(i) && i.parent() == parent)
        {
            set_all_files_selection_state(flags, i);
        }
    }
}

This works partially, in that it selects all files which are currently
displayed in the view. If I expand the whole view to show the
contents of subdirs, it selects everything visible. If I don't,
it selects only those visible files.

It's not clear to me what is preventing the code from selecting
everything in the model. Can someone explain how to fix this ?

-- 
Stephen Collyer
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