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diff --git a/src/gui/util/qabstractlayoutstyleinfo_p.h b/src/gui/util/qabstractlayoutstyleinfo_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QABSTRACTLAYOUTSTYLEINFO_P_H
+#define QABSTRACTLAYOUTSTYLEINFO_P_H
+
+#include <QtCore/qnamespace.h>
+#include "qlayoutpolicy_p.h"
+
+QT_BEGIN_NAMESPACE
+
+
+class Q_GUI_EXPORT QAbstractLayoutStyleInfo {
+public:
+    typedef enum {
+        Unknown = 0,
+        Changed,
+        Unchanged
+    } ChangedState;
+
+    QAbstractLayoutStyleInfo() : m_isWindow(false), m_changed(Changed) {}
+    virtual ~QAbstractLayoutStyleInfo() {}
+    virtual qreal combinedLayoutSpacing(QLayoutPolicy::ControlTypes /*controls1*/,
+                                        QLayoutPolicy::ControlTypes /*controls2*/, Qt::Orientation /*orientation*/) const {
+        return -1;
+    }
+
+    virtual qreal perItemSpacing(QLayoutPolicy::ControlType /*control1*/,
+                                 QLayoutPolicy::ControlType /*control2*/,
+                                 Qt::Orientation /*orientation*/) const {
+        return -1;
+    }
+
+    virtual qreal spacing(Qt::Orientation orientation) const = 0;
+
+    virtual bool hasChangedCore() const = 0;
+
+    void updateChanged(ChangedState change) {
+        m_changed = change;
+    }
+
+    bool hasChanged() const;
+
+    virtual void invalidate() { updateChanged(Changed);}
+
+    virtual qreal windowMargin(Qt::Orientation orientation) const = 0;
+
+    bool isWindow() const {
+        return m_isWindow;
+    }
+
+protected:
+    unsigned m_isWindow : 1;
+    mutable unsigned m_changed : 2;
+};
+
+QT_END_NAMESPACE
+
+#endif // QABSTRACTLAYOUTSTYLEINFO_P_H