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+/****************************************************************************
+**
+** Copyright (C) 2020 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Quick Templates 2 module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later as published by the Free
+** Software Foundation and appearing in the file LICENSE.GPL included in
+** the packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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>
+#include <QtCore/QTransposeProxyModel>
+#include <QtQuick/private/qquicktableview_p_p.h>
+#include <private/qquickheaderview_p.h>
+
+QT_BEGIN_NAMESPACE
+
+class Q_QUICKTEMPLATES2_PRIVATE_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;
+
+    inline QVariant variantValue() const;
+    inline Qt::Orientation orientation() const;
+    inline void setOrientation(Qt::Orientation o);
+
+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;
+
+protected:
+    QHeaderDataProxyModel m_headerDataProxyModel;
+    QTransposeProxyModel m_transposeProxyModel;
+    struct SectionSize
+    {
+        int section;
+        qreal previousSize;
+    };
+    QStack<SectionSize> m_hiddenSectionSizes;
+    bool m_modelExplicitlySetByUser = false;
+    QString m_textRole = QStringLiteral("display");
+};
+
+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