Method ChangePlaylistPosition

src/music_gui.cpp:413–422

* Change playlist position pointer by the given offset, making sure to keep it within valid range. * If the playlist is empty, position is always set to 0. * @param ofs Amount to move playlist position by. */

 * @param ofs Amount to move playlist position by.
 */
void MusicSystem::ChangePlaylistPosition(int ofs)
{
	if (this->active_playlist.empty()) {
		this->playlist_position = 0;
	} else {
		this->playlist_position += ofs;
		while (this->playlist_position >= (int)this->active_playlist.size()) this->playlist_position -= (int)this->active_playlist.size();
		while (this->playlist_position < 0) this->playlist_position += (int)this->active_playlist.size();
	}
}

/**
 * Save a custom playlist to settings after modification.