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diff --git a/GudhUI/gui/Menu_edge_contraction.h b/GudhUI/gui/Menu_edge_contraction.h
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+++ b/GudhUI/gui/Menu_edge_contraction.h
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+/*    This file is part of the Gudhi Library. The Gudhi library
+ *    (Geometric Understanding in Higher Dimensions) is a generic C++
+ *    library for computational topology.
+ *
+ *    Author(s):       David Salinas
+ *
+ *    Copyright (C) 2014  INRIA Sophia Antipolis-Mediterranee (France)
+ *
+ *    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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GUI_MENU_EDGE_CONTRACTION_H_
+#define GUI_MENU_EDGE_CONTRACTION_H_
+
+// Workaround for moc-qt4 not parsing boost headers
+#include <CGAL/config.h>
+
+#include "gui/MainWindow.h"
+#include "gui/ui_MenuEdgeContraction.h"
+
+#include "model/Model.h"
+
+class Menu_edge_contraction : public QDialog, public Ui::MenuEdgeContraction {
+  Q_OBJECT
+
+ private:
+  MainWindow* parent_;
+  const Model& model_;
+
+  void update_slider_value();
+
+ public:
+  Menu_edge_contraction(MainWindow* parent, const Model& model);
+
+  void connectActions(MainWindow* parent);
+
+ private:
+  unsigned num_vertices();
+  unsigned num_collapses();
+
+ public slots:
+  void slider_value_changed(int new_slider_value);
+  void update_gui_numbers();
+  void update_gui_numbers(int gui_numbers);
+
+  void send_contract_edges();
+
+ signals:
+  void contract_edges(unsigned num_collapses);
+};
+
+#endif  // GUI_MENU_EDGE_CONTRACTION_H_