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diff --git a/src/datavisualizationqml/declarativetheme_p.h b/src/datavisualizationqml/declarativetheme_p.h
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+++ b/src/datavisualizationqml/declarativetheme_p.h
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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the QtDataVisualization 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 DECLARATIVETHEME_P_H
+#define DECLARATIVETHEME_P_H
+
+#include <private/datavisualizationglobal_p.h>
+#include <private/q3dtheme_p.h>
+
+#include "declarativecolor_p.h"
+#include "colorgradient_p.h"
+
+#include <QtQml/qqml.h>
+#include <QtQml/qqmlparserstatus.h>
+
+QT_BEGIN_NAMESPACE
+
+class DeclarativeTheme3D : public Q3DTheme, public QQmlParserStatus
+{
+    Q_OBJECT
+    Q_INTERFACES(QQmlParserStatus)
+    Q_PROPERTY(QQmlListProperty<QObject> themeChildren READ themeChildren)
+    Q_PROPERTY(QQmlListProperty<DeclarativeColor> baseColors READ baseColors)
+    Q_PROPERTY(QQmlListProperty<ColorGradient> baseGradients READ baseGradients)
+    Q_PROPERTY(ColorGradient *singleHighlightGradient READ singleHighlightGradient WRITE setSingleHighlightGradient NOTIFY singleHighlightGradientChanged)
+    Q_PROPERTY(ColorGradient *multiHighlightGradient READ multiHighlightGradient WRITE setMultiHighlightGradient NOTIFY multiHighlightGradientChanged)
+    Q_CLASSINFO("DefaultProperty", "themeChildren")
+    QML_NAMED_ELEMENT(Theme3D)
+    QML_ADDED_IN_VERSION(1, 0)
+
+public:
+    DeclarativeTheme3D(QObject *parent = 0);
+    virtual ~DeclarativeTheme3D();
+
+    QQmlListProperty<QObject> themeChildren();
+    static void appendThemeChildren(QQmlListProperty<QObject> *list, QObject *element);
+
+    QQmlListProperty<DeclarativeColor> baseColors();
+    static void appendBaseColorsFunc(QQmlListProperty<DeclarativeColor> *list,
+                                     DeclarativeColor *color);
+    static qsizetype countBaseColorsFunc(QQmlListProperty<DeclarativeColor> *list);
+    static DeclarativeColor *atBaseColorsFunc(QQmlListProperty<DeclarativeColor> *list,
+                                              qsizetype index);
+    static void clearBaseColorsFunc(QQmlListProperty<DeclarativeColor> *list);
+
+    QQmlListProperty<ColorGradient> baseGradients();
+    static void appendBaseGradientsFunc(QQmlListProperty<ColorGradient> *list,
+                                        ColorGradient *gradient);
+    static qsizetype countBaseGradientsFunc(QQmlListProperty<ColorGradient> *list);
+    static ColorGradient *atBaseGradientsFunc(QQmlListProperty<ColorGradient> *list,
+                                              qsizetype index);
+    static void clearBaseGradientsFunc(QQmlListProperty<ColorGradient> *list);
+
+    void setSingleHighlightGradient(ColorGradient *gradient);
+    ColorGradient *singleHighlightGradient() const;
+
+    void setMultiHighlightGradient(ColorGradient *gradient);
+    ColorGradient *multiHighlightGradient() const;
+
+    // From QQmlParserStatus
+    void classBegin() override;
+    void componentComplete() override;
+
+Q_SIGNALS:
+    void singleHighlightGradientChanged(ColorGradient *gradient);
+    void multiHighlightGradientChanged(ColorGradient *gradient);
+
+protected:
+    void handleTypeChange(Theme themeType);
+    void handleBaseColorUpdate();
+    void handleBaseGradientUpdate();
+    void handleSingleHLGradientUpdate();
+    void handleMultiHLGradientUpdate();
+
+    enum GradientType {
+        GradientTypeBase = 0,
+        GradientTypeSingleHL,
+        GradientTypeMultiHL
+    };
+
+private:
+    void addColor(DeclarativeColor *color);
+    QList<DeclarativeColor *> colorList();
+    void clearColors();
+    void clearDummyColors();
+
+    void addGradient(ColorGradient *gradient);
+    QList<ColorGradient *> gradientList();
+    void clearGradients();
+    void clearDummyGradients();
+
+    void setThemeGradient(ColorGradient *gradient, GradientType type);
+    QLinearGradient convertGradient(ColorGradient *gradient);
+    ColorGradient *convertGradient(const QLinearGradient &gradient);
+
+    QList<DeclarativeColor *> m_colors; // Not owned
+    QList<ColorGradient *> m_gradients; // Not owned
+    ColorGradient *m_singleHLGradient; // Not owned
+    ColorGradient *m_multiHLGradient; // Not owned
+
+    bool m_dummyGradients;
+    bool m_dummyColors;
+};
+
+QT_END_NAMESPACE
+
+#endif