1 files changed, 48 insertions, 0 deletions
diff --git a/examples/datavisualization/graphgallery/variantbardataproxy.h b/examples/datavisualization/graphgallery/variantbardataproxy.h
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+++ b/examples/datavisualization/graphgallery/variantbardataproxy.h
@@ -0,0 +1,48 @@
+// Copyright (C) 2023 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef VARIANTBARDATAPROXY_H
+#define VARIANTBARDATAPROXY_H
+
+#include "variantdataset.h"
+#include "variantbardatamapping.h"
+#include <QtDataVisualization/qbardataproxy.h>
+#include <QtCore/qpointer.h>
+
+//! [0]
+class VariantBarDataProxy : public QBarDataProxy
+//! [0]
+{
+    Q_OBJECT
+
+public:
+    VariantBarDataProxy();
+    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 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