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diff --git a/src/quicktemplates/qquickheaderview_p_p.h b/src/quicktemplates/qquickheaderview_p_p.h
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+++ b/src/quicktemplates/qquickheaderview_p_p.h
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+// Copyright (C) 2020 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#ifndef QQUICKHEADERVIEW_P_P_H
+#define QQUICKHEADERVIEW_P_P_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt 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.
+//
+
+#include <QtCore/QAbstractItemModel>
+#include <QtCore/QPointer>
+#if QT_CONFIG(transposeproxymodel)
+#include <QtCore/QTransposeProxyModel>
+#endif
+#include <QtQuick/private/qquicktableview_p_p.h>
+#include <private/qquickheaderview_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class Q_QUICKTEMPLATES2_EXPORT QHeaderDataProxyModel : public QAbstractItemModel
+{
+    Q_OBJECT
+    Q_DISABLE_COPY(QHeaderDataProxyModel)
+    Q_PROPERTY(QAbstractItemModel *sourceModel READ sourceModel)
+public:
+    explicit QHeaderDataProxyModel(QObject *parent = nullptr);
+    ~QHeaderDataProxyModel();
+
+    void setSourceModel(QAbstractItemModel *newSourceModel);
+    QPointer<QAbstractItemModel> sourceModel() const;
+    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const override;
+    QModelIndex parent(const QModelIndex &child) const override;
+    QModelIndex sibling(int row, int column, const QModelIndex &idx) const override;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+    bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override;
+    bool hasChildren(const QModelIndex &parent = QModelIndex()) const override;
+    QHash<int, QByteArray> roleNames() const override;
+
+    inline QVariant variantValue() const;
+    inline Qt::Orientation orientation() const;
+    inline void setOrientation(Qt::Orientation o);
+
+    QQuickHeaderViewBase *m_headerView = nullptr;
+
+private:
+    inline void connectToModel();
+    inline void disconnectFromModel();
+    QPointer<QAbstractItemModel> m_model = nullptr;
+    Qt::Orientation m_orientation = Qt::Horizontal;
+};
+
+class QQuickHeaderViewBasePrivate : public QQuickTableViewPrivate
+{
+    Q_DECLARE_PUBLIC(QQuickHeaderViewBase)
+public:
+    QQuickHeaderViewBasePrivate();
+    ~QQuickHeaderViewBasePrivate();
+
+    Qt::Orientation orientation() const;
+    void setOrientation(Qt::Orientation orientation);
+    const QPointer<QQuickItem> delegateItemAt(int row, int col) const;
+    QVariant modelImpl() const override;
+    void setModelImpl(const QVariant &newModel) override;
+    void syncModel() override;
+    void syncSyncView() override;
+    QAbstractItemModel *selectionSourceModel() override;
+
+protected:
+    QHeaderDataProxyModel m_headerDataProxyModel;
+#if QT_CONFIG(transposeproxymodel)
+    QTransposeProxyModel m_transposeProxyModel;
+#endif
+    struct SectionSize
+    {
+        int section;
+        qreal previousSize;
+    };
+    QStack<SectionSize> m_hiddenSectionSizes;
+    bool m_modelExplicitlySetByUser = false;
+    QString m_textRole;
+};
+
+class QQuickHorizontalHeaderViewPrivate : public QQuickHeaderViewBasePrivate
+{
+    Q_DECLARE_PUBLIC(QQuickHorizontalHeaderView)
+public:
+    QQuickHorizontalHeaderViewPrivate();
+    ~QQuickHorizontalHeaderViewPrivate();
+};
+
+class QQuickVerticalHeaderViewPrivate : public QQuickHeaderViewBasePrivate
+{
+    Q_DECLARE_PUBLIC(QQuickVerticalHeaderView)
+public:
+    QQuickVerticalHeaderViewPrivate();
+    ~QQuickVerticalHeaderViewPrivate();
+};
+
+QT_END_NAMESPACE
+
+#endif // QQUICKHEADERVIEW_P_P_H