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diff --git a/src/plugins/diffeditor/diffeditorguicontroller.h b/src/plugins/diffeditor/diffeditorguicontroller.h
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+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+
+#ifndef DIFFEDITORGUICONTROLLER_H
+#define DIFFEDITORGUICONTROLLER_H
+
+#include "diffeditor_global.h"
+
+#include <QObject>
+
+namespace DiffEditor {
+
+class DiffEditorController;
+
+class DIFFEDITOR_EXPORT DiffEditorGuiController : public QObject
+{
+    Q_OBJECT
+public:
+    DiffEditorGuiController(DiffEditorController *controller, QObject *parent = 0);
+    ~DiffEditorGuiController();
+
+    DiffEditorController *controller() const;
+
+    bool isDescriptionVisible() const;
+    int contextLinesNumber() const;
+    bool isIgnoreWhitespaces() const;
+    bool horizontalScrollBarSynchronization() const;
+    int currentDiffFileIndex() const;
+
+public slots:
+    void setDescriptionVisible(bool on);
+    void setContextLinesNumber(int lines);
+    void setIgnoreWhitespaces(bool ignore);
+    void setHorizontalScrollBarSynchronization(bool on);
+    void setCurrentDiffFileIndex(int diffFileIndex);
+
+signals:
+    void descriptionVisibilityChanged(bool on);
+    void contextLinesNumberChanged(int lines);
+    void ignoreWhitespacesChanged(bool ignore);
+    void horizontalScrollBarSynchronizationChanged(bool on);
+    void currentDiffFileIndexChanged(int diffFileIndex);
+
+private slots:
+    void slotUpdateDiffFileIndex();
+
+private:
+    DiffEditorController *m_controller;
+    bool m_descriptionVisible;
+    int m_contextLinesNumber;
+    bool m_ignoreWhitespaces;
+    bool m_syncScrollBars;
+    int m_currentDiffFileIndex;
+};
+
+} // namespace DiffEditor
+
+#endif // DIFFEDITORGUICONTROLLER_H