- Qt 6.7
- Qt Graphs
- Graph Gallery
- Qt Graphs | Commercial or GPLv3

# Graph Gallery

     // Copyright (C) 2023 The Qt Company Ltd.
     // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

     #ifndef VARIANTBARDATAPROXY_H
     #define VARIANTBARDATAPROXY_H

     #include <QtCore/qpointer.h>
     #include <QtGraphs/qbardataproxy.h>
     #include "variantbardatamapping.h"
     #include "variantdataset.h"

     class VariantBarDataProxy : public QBarDataProxy
     {
         Q_OBJECT

     public:
         explicit VariantBarDataProxy();
         ~VariantBarDataProxy() override;

         // 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();

     public Q_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