provide generic interface for dealing with selected items

src/menu.cpp

@@ -0,0 +1,45 @@
+/***************************************************************************
+ *   Copyright (C) 2008-2009 by Andrzej Rybczak                            *
+ *   electricityispower@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; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ *                                                                         *
+ *   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.              *
+ ***************************************************************************/
+
+#include "menu.h"
+
+void List::SelectCurrent()
+{
+	if (Empty())
+		return;
+	size_t i = Choice();
+	Select(i, !isSelected(i));
+}
+
+void List::ReverseSelection(size_t beginning)
+{
+	for (size_t i = beginning; i < Size(); i++)
+		Select(i, !isSelected(i) && !isStatic(i));
+}
+
+bool List::Deselect()
+{
+	if (!hasSelected())
+		return false;
+	for (size_t i = 0; i < Size(); i++)
+		Select(i, 0);
+	return true;
+}
+