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diff --git a/src/kitemviews/kitemlistviewlayouter_p.h b/src/kitemviews/kitemlistviewlayouter_p.h
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+++ b/src/kitemviews/kitemlistviewlayouter_p.h
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+/***************************************************************************
+ *   Copyright (C) 2011 by Peter Penz <[email protected]>             *
+ *                                                                         *
+ *   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 Street, Fifth Floor, Boston, MA 02110-1301 USA            *
+ ***************************************************************************/
+
+#ifndef KITEMLISTVIEWLAYOUTER_H
+#define KITEMLISTVIEWLAYOUTER_H
+
+#include <libdolphin_export.h>
+
+#include <QObject>
+#include <QRectF>
+#include <QSet>
+#include <QSizeF>
+
+class KItemModelBase;
+class KItemListSizeHintResolver;
+
+class LIBDOLPHINPRIVATE_EXPORT KItemListViewLayouter : public QObject
+{
+    Q_OBJECT
+
+public:
+    KItemListViewLayouter(QObject* parent = 0);
+    virtual ~KItemListViewLayouter();
+
+    void setScrollOrientation(Qt::Orientation orientation);
+    Qt::Orientation scrollOrientation() const;
+
+    void setSize(const QSizeF& size);
+    QSizeF size() const;
+
+    void setItemSize(const QSizeF& size);
+    QSizeF itemSize() const;
+
+    // TODO: add note that offset can be < 0 or > maximumOffset!
+    void setOffset(qreal offset);
+    qreal offset() const;
+
+    void setModel(const KItemModelBase* model);
+    const KItemModelBase* model() const;
+
+    void setSizeHintResolver(const KItemListSizeHintResolver* sizeHintResolver);
+    const KItemListSizeHintResolver* sizeHintResolver() const;
+
+    qreal maximumOffset() const;
+
+    // TODO: mention that return value is -1 if count == 0
+    int firstVisibleIndex() const;
+
+    // TODO: mention that return value is -1 if count == 0
+    int lastVisibleIndex() const;
+
+    QRectF itemBoundingRect(int index) const;
+
+    int maximumVisibleItems() const;
+
+    /**
+     * @return True if the item with the index \p itemIndex
+     *         is the first item within a group.
+     */
+    bool isFirstGroupItem(int itemIndex) const;
+
+    void markAsDirty();
+
+private:
+    void doLayout();
+
+    void updateVisibleIndexes();
+    void updateGroupedVisibleIndexes();
+    void createGroupHeaders();
+
+private:
+    bool m_dirty;
+    bool m_visibleIndexesDirty;
+    bool m_grouped;
+
+    Qt::Orientation m_scrollOrientation;
+    QSizeF m_size;
+
+    QSizeF m_itemSize;
+    const KItemModelBase* m_model;
+    const KItemListSizeHintResolver* m_sizeHintResolver;
+
+    qreal m_offset;
+    qreal m_maximumOffset;
+
+    int m_firstVisibleIndex;
+    int m_lastVisibleIndex;
+
+    int m_firstVisibleGroupIndex;
+
+    qreal m_columnWidth;
+    qreal m_xPosInc;
+    int m_columnCount;
+
+    struct ItemGroup {
+        int firstItemIndex;
+        qreal y;
+    };
+    QList<ItemGroup> m_groups;
+
+    // Stores all item indexes that are the first item of a group.
+    // Assures fast access for KItemListViewLayouter::isFirstGroupItem().
+    QSet<int> m_groupIndexes;
+
+    QList<QRectF> m_itemBoundingRects;
+};
+
+#endif
+
+