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#include <QCoroDBus>
QCoro::Task<QString> PlayerControl::nextSong() {
// Create a regular QDBusInterface representing the Spotify MPRIS interface
QDBusInterface spotifyPlayer{QStringLiteral("org.mpris.MediaPlayer2.spotify"),
QStringLiteral("/org/mpris/MediaPlayer2"),
QStringLiteral("org.mpris.MediaPlayer2.Player")};
// Call CanGoNext DBus method and co_await reply. During that the current coroutine is suspended.
const QDBusReply<bool> canGoNext = co_await spotifyPlayer.asyncCall(QStringLiteral("CanGoNext"));
// Response has arrived and coroutine is resumed. If the player can go to the next song,
// do another async call to do so.
if (static_cast<bool>(canGoNext)) {
// co_await the call to finish, but throw away the result
co_await spotifyPlayer.asyncCall(QStringLiteral("Next"));
}
// Finally, another async call to retrieve new track metadata. Once again, the coroutine
// is suspended while we wait for the result.
const QDBusReply<QVariantMap> metadata = co_await spotifyPlayer.asyncCall(QStringLiteral("Metadata"));
// Since this function uses co_await, it is in fact a coroutine, so it must use co_return in order
// to return our result. By definition, the result of this function can be co_awaited by the caller.
co_return static_cast<const QVariantMap &>(metadata)[QStringLiteral("xesam:title")].toString();
}
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