/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
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** This file is part of the QtPDF module of the Qt Toolkit.
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****************************************************************************/

#ifndef QQUICKPDFNAVIGATIONSTACK_P_H
#define QQUICKPDFNAVIGATIONSTACK_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 "qquickpdfdocument_p.h"
#include "../api/qpdfdestination_p.h"

#include <QtQml/qqml.h>

QT_BEGIN_NAMESPACE

class QQuickPdfNavigationStack : public QObject
{
    Q_OBJECT
    Q_PROPERTY(int currentPage READ currentPage NOTIFY currentPageChanged)
    Q_PROPERTY(QPointF currentLocation READ currentLocation NOTIFY currentLocationChanged)
    Q_PROPERTY(qreal currentZoom READ currentZoom NOTIFY currentZoomChanged)
    Q_PROPERTY(bool backAvailable READ backAvailable NOTIFY backAvailableChanged)
    Q_PROPERTY(bool forwardAvailable READ forwardAvailable NOTIFY forwardAvailableChanged)

public:
    explicit QQuickPdfNavigationStack(QObject *parent = nullptr);

    Q_INVOKABLE void push(int page, QPointF location, qreal zoom, bool emitJumped = true);
    Q_INVOKABLE void update(int page, QPointF location, qreal zoom);
    Q_INVOKABLE void forward();
    Q_INVOKABLE void back();

    int currentPage() const;
    QPointF currentLocation() const;
    qreal currentZoom() const;

    bool backAvailable() const;
    bool forwardAvailable() const;

Q_SIGNALS:
    void currentPageChanged();
    void currentLocationChanged();
    void currentZoomChanged();
    void backAvailableChanged();
    void forwardAvailableChanged();
    void jumped(int page, QPointF location, qreal zoom);

private:
    QVector<QExplicitlySharedDataPointer<QPdfDestinationPrivate>> m_pageHistory;
    int m_currentHistoryIndex = 0;
    bool m_changing = false;

    Q_DISABLE_COPY(QQuickPdfNavigationStack)
};

QT_END_NAMESPACE

QML_DECLARE_TYPE(QQuickPdfNavigationStack)

#endif // QQUICKPDFNAVIGATIONSTACK_P_H