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copied!<p>I believe what you can do is:</p> <ol> <li>Create a custom proxy model. You can use <a href="http://doc.qt.io/qt-5/qsortfilterproxymodel.html" rel="nofollow noreferrer">QSortFilterProxyModel</a> as a base class for your model; </li> <li>In the proxy model override the <a href="http://doc.qt.io/qt-5/qsortfilterproxymodel.html#filterAcceptsRow" rel="nofollow noreferrer">filterAcceptsRow</a> method and return false for files which have the <em>".backup."</em> word in their names;</li> <li>Set new proxy model to the file dialog: <a href="http://doc.qt.io/qt-5/qfiledialog.html#setProxyModel" rel="nofollow noreferrer">QFileDialog::setProxyModel</a>;</li> </ol> <p>Below is an example:</p> <p>Proxy model:</p> <pre><code>class FileFilterProxyModel : public QSortFilterProxyModel { protected: virtual bool filterAcceptsRow(int source_row, const QModelIndex& source_parent) const; }; bool FileFilterProxyModel::filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const { QModelIndex index0 = sourceModel()->index(sourceRow, 0, sourceParent); QFileSystemModel* fileModel = qobject_cast<QFileSystemModel*>(sourceModel()); return fileModel->fileName(index0).indexOf(".backup.") < 0; // uncomment to call the default implementation //return QSortFilterProxyModel::filterAcceptsRow(sourceRow, sourceParent); } </code></pre> <p>dialog was created this way:</p> <pre><code>QFileDialog dialog; dialog.setProxyModel(new FileFilterProxyModel); dialog.setNameFilter("XML (*.xml)"); dialog.setOption(QFileDialog::DontUseNativeDialog); dialog.exec(); </code></pre> <p>The proxy model is supported by non-native file dialogs only.</p>

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