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#ifndef QMEDIAPLAYLISTNAVIGATOR_H
#define QMEDIAPLAYLISTNAVIGATOR_H

#include "qmediaplaylistprovider.h"
#include "qmediaplaylist.h"
#include <QtCore/qobject.h>

QT_BEGIN_NAMESPACE

class QMediaPlaylistNavigatorPrivate;
class Q_MULTIMEDIA_EXPORT QMediaPlaylistNavigator : public QObject
{
    Q_OBJECT
    Q_PROPERTY(QMediaPlaylist::PlaybackMode playbackMode READ playbackMode WRITE setPlaybackMode NOTIFY playbackModeChanged)
    Q_PROPERTY(int currentIndex READ currentIndex WRITE jump NOTIFY currentIndexChanged)
    Q_PROPERTY(QMediaContent currentItem READ currentItem)

public:
    QMediaPlaylistNavigator(QMediaPlaylistProvider *playlist, QObject *parent = 0);
    virtual ~QMediaPlaylistNavigator();

    QMediaPlaylistProvider *playlist() const;
    void setPlaylist(QMediaPlaylistProvider *playlist);

    QMediaPlaylist::PlaybackMode playbackMode() const;

    QMediaContent currentItem() const;
    QMediaContent nextItem(int steps = 1) const;
    QMediaContent previousItem(int steps = 1) const;

    QMediaContent itemAt(int position) const;

    int currentIndex() const;
    int nextIndex(int steps = 1) const;
    int previousIndex(int steps = 1) const;

public Q_SLOTS:
    void next();
    void previous();

    void jump(int);

    void setPlaybackMode(QMediaPlaylist::PlaybackMode mode);

Q_SIGNALS:
    void activated(const QMediaContent &content);
    void currentIndexChanged(int);
    void playbackModeChanged(QMediaPlaylist::PlaybackMode mode);

    void surroundingItemsChanged();

protected:
    QMediaPlaylistNavigatorPrivate *d_ptr;

private:
    Q_DISABLE_COPY(QMediaPlaylistNavigator)
    Q_DECLARE_PRIVATE(QMediaPlaylistNavigator)

    Q_PRIVATE_SLOT(d_func(), void _q_mediaInserted(int start, int end))
    Q_PRIVATE_SLOT(d_func(), void _q_mediaRemoved(int start, int end))
    Q_PRIVATE_SLOT(d_func(), void _q_mediaChanged(int start, int end))
};

QT_END_NAMESPACE

#endif // QMEDIAPLAYLISTNAVIGATOR_H