diff -r 0c98d3b249f7 -r 4df9d8cedf7f QTfrontend/model/ThemeFilterProxyModel.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/QTfrontend/model/ThemeFilterProxyModel.h	Sun Mar 18 14:38:48 2018 +0100
@@ -0,0 +1,47 @@
+/*
+ * Hedgewars, a free turn based strategy game
+ * Copyright (c) 2004-2018 Andrey Korotaev <unC0Rr@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/**
+ * @file
+ * @brief Class definition of ThemeFilterProxyModel
+ */
+
+#ifndef HEDGEWARS_THEMEFILTERPROXYMODEL_H
+#define HEDGEWARS_THEMEFILTERPROXYMODEL_H
+
+#include <QSortFilterProxyModel>
+
+/**
+ * @brief A filter model for filtering DLC themes
+ */
+class ThemeFilterProxyModel : public QSortFilterProxyModel
+{
+        Q_OBJECT
+
+    public:
+        ThemeFilterProxyModel(QObject *parent = 0);
+        void setFilterDLC(bool enabled);
+
+    protected:
+        bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const;
+
+    private:
+        bool isFilteringDLC;
+};
+
+#endif // HEDGEWARS_THEMEFILTERPROXYMODEL_H