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diff --git a/examples/datavisualization/graphgallery/variantbardatamapping.h b/examples/datavisualization/graphgallery/variantbardatamapping.h
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+++ b/examples/datavisualization/graphgallery/variantbardatamapping.h
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+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef VARIANTBARDATAMAPPING_H
+#define VARIANTBARDATAMAPPING_H
+
+#include <QtCore/qobject.h>
+#include <QtCore/qstringlist.h>
+
+class VariantBarDataMapping : public QObject
+{
+    Q_OBJECT
+    //! [0]
+    Q_PROPERTY(int rowIndex READ rowIndex WRITE setRowIndex NOTIFY rowIndexChanged)
+    Q_PROPERTY(int columnIndex READ columnIndex WRITE setColumnIndex NOTIFY columnIndexChanged)
+    Q_PROPERTY(int valueIndex READ valueIndex WRITE setValueIndex NOTIFY valueIndexChanged)
+    Q_PROPERTY(QStringList rowCategories READ rowCategories WRITE setRowCategories NOTIFY rowCategoriesChanged)
+    Q_PROPERTY(QStringList columnCategories READ columnCategories WRITE setColumnCategories NOTIFY columnCategoriesChanged)
+    //! [0]
+public:
+    //! [1]
+    explicit VariantBarDataMapping(int rowIndex, int columnIndex, int valueIndex,
+                                   const QStringList &rowCategories,
+                                   const QStringList &columnCategories);
+    //! [1]
+    virtual ~VariantBarDataMapping();
+
+    void setRowIndex(int index);
+    int rowIndex() const;
+    void setColumnIndex(int index);
+    int columnIndex() const;
+    void setValueIndex(int index);
+    int valueIndex() const;
+
+    void setRowCategories(const QStringList &categories);
+    const QStringList &rowCategories() const;
+    void setColumnCategories(const QStringList &categories);
+    const QStringList &columnCategories() const;
+
+    //! [2]
+    void remap(int rowIndex, int columnIndex, int valueIndex,
+               const QStringList &rowCategories,
+               const QStringList &columnCategories);
+    //! [2]
+Q_SIGNALS:
+    void rowIndexChanged();
+    void columnIndexChanged();
+    void valueIndexChanged();
+    void rowCategoriesChanged();
+    void columnCategoriesChanged();
+    //! [3]
+    void mappingChanged();
+    //! [3]
+
+private:
+    // Indexes of the mapped items in the VariantDataItem
+    int m_rowIndex = 0;
+    int m_columnIndex = 1;
+    int m_valueIndex = 2;
+
+    // For row/column items, sort items into these categories. Other categories are ignored.
+    QStringList m_rowCategories = {};
+    QStringList m_columnCategories = {};
+};
+
+#endif