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diff --git a/src/datavis3d/data/qitemmodelbardataproxy_p.h b/src/datavis3d/data/qitemmodelbardataproxy_p.h
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+/****************************************************************************
+**
+** Copyright (C) 2013 Digia Plc
+** All rights reserved.
+** For any questions to Digia, please use contact form at http://qt.digia.com
+**
+** This file is part of the QtDataVis3D module.
+**
+** Licensees holding valid Qt Enterprise licenses may use this file in
+** accordance with the Qt Enterprise License Agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.
+**
+** If you have questions regarding the use of this file, please use
+** contact form at http://qt.digia.com
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the QtDataVis3D API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+
+#ifndef QITEMMODELBARDATAPROXY_P_H
+#define QITEMMODELBARDATAPROXY_P_H
+
+#include "qitemmodelbardataproxy.h"
+#include "qbardataproxy_p.h"
+#include <QPointer>
+#include <QTimer>
+
+QT_DATAVIS3D_BEGIN_NAMESPACE
+
+class QItemModelBarDataProxyPrivate : public QBarDataProxyPrivate
+{
+    Q_OBJECT
+public:
+    QItemModelBarDataProxyPrivate(QItemModelBarDataProxy *q);
+    virtual ~QItemModelBarDataProxyPrivate();
+
+    void setItemModel(QAbstractItemModel *itemModel);
+    void setMapping(QItemModelBarDataMapping *mapping);
+
+public slots:
+    void handleColumnsInserted(const QModelIndex & parent, int start, int end);
+    void handleColumnsMoved(const QModelIndex & sourceParent, int sourceStart, int sourceEnd, const QModelIndex & destinationParent, int destinationColumn);
+    void handleColumnsRemoved(const QModelIndex & parent, int start, int end);
+    void handleDataChanged(const QModelIndex & topLeft, const QModelIndex & bottomRight, const QVector<int> & roles = QVector<int> ());
+    void handleLayoutChanged(const QList<QPersistentModelIndex> & parents = QList<QPersistentModelIndex> (), QAbstractItemModel::LayoutChangeHint hint = QAbstractItemModel::NoLayoutChangeHint);
+    void handleModelReset();
+    void handleRowsInserted(const QModelIndex & parent, int start, int end);
+    void handleRowsMoved(const QModelIndex & sourceParent, int sourceStart, int sourceEnd, const QModelIndex & destinationParent, int destinationRow);
+    void handleRowsRemoved(const QModelIndex & parent, int start, int end);
+
+    void handleMappingChanged();
+    void handlePendingResolve();
+
+private:
+    void resolveModel();
+    QItemModelBarDataProxy *qptr();
+
+    QPointer<QAbstractItemModel> m_itemModel;  // Not owned
+    QPointer<QItemModelBarDataMapping> m_mapping; // Not owned
+    bool resolvePending;
+    QTimer m_resolveTimer;
+
+    friend class QItemModelBarDataProxy;
+};
+
+QT_DATAVIS3D_END_NAMESPACE
+
+#endif