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diff --git a/examples/datavisualization/customproxy/variantbardataproxy.h b/examples/datavisualization/customproxy/variantbardataproxy.h
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+/****************************************************************************
+**
+** Copyright (C) 2014 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 QtDataVisualization 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
+**
+****************************************************************************/
+
+#ifndef VARIANTBARDATAPROXY_H
+#define VARIANTBARDATAPROXY_H
+
+#include "qbardataproxy.h"
+#include "variantdataset.h"
+#include "variantbardatamapping.h"
+#include <QStringList>
+#include <QMap>
+#include <QPointer>
+
+using namespace QtDataVisualization;
+
+//! [0]
+class VariantBarDataProxy : public QBarDataProxy
+//! [0]
+{
+    Q_OBJECT
+
+public:
+    explicit VariantBarDataProxy();
+    explicit VariantBarDataProxy(VariantDataSet *newSet, VariantBarDataMapping *mapping);
+    virtual ~VariantBarDataProxy();
+
+    //! [1]
+    // Doesn't gain ownership of the dataset, but does connect to it to listen for data changes.
+    void setDataSet(VariantDataSet *newSet);
+    VariantDataSet *dataSet();
+
+    // Map key (row, column, value) to value index in data item (VariantItem).
+    // Doesn't gain ownership of mapping, but does connect to it to listen for mapping changes.
+    // Modifying mapping that is set to proxy will trigger dataset re-resolving.
+    void setMapping(VariantBarDataMapping *mapping);
+    VariantBarDataMapping *mapping();
+    //! [1]
+
+public slots:
+    void handleItemsAdded(int index, int count);
+    void handleDataCleared();
+    void handleMappingChanged();
+
+private:
+    void resolveDataSet();
+
+    QPointer<VariantDataSet> m_dataSet;
+    QPointer<VariantBarDataMapping> m_mapping;
+
+    Q_DISABLE_COPY(VariantBarDataProxy)
+};
+
+#endif