coverartmodel.cpp Example File

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 #include "coverartmodel.h"

 #include "albumdelegate.h"

 #include <QtCore/qcryptographichash.h>
 #include <QtCore/qdir.h>
 #include <QtCore/qurl.h>

 #define QT_GALLERY_MEDIA_ART_ILLEGAL_CHARACTERS \
     "\\(.*\\)|\\{.*\\}|\\[.*\\]|<.*>|[\\(\\)_\\{\\}\\[\\]\\!@#$\\^&\\*\\+\\=\\|\\\\/\"'\\?~`]"

 CoverArtModel::CoverArtModel(QAbstractGallery *gallery, QObject *parent)
     : ThumbnailModel(gallery, parent)
 #if defined(Q_OS_UNIX) && !(defined(Q_OS_SYMBIAN) || defined(Q_OS_MAC))
     , illegalCharacters(QLatin1String(QT_GALLERY_MEDIA_ART_ILLEGAL_CHARACTERS))
     , whitespace(QCryptographicHash::hash(" ", QCryptographicHash::Md5).toHex())
 #endif
 {
 }

 #if defined(Q_OS_UNIX) && !(defined(Q_OS_SYMBIAN) || defined(Q_OS_MAC))
 QUrl CoverArtModel::imageUrl(const QModelIndex &index) const
 {
     QString title = index.data(Qt::DisplayRole).toString();
     QString artist = index.data(AlbumDelegate::Artist).toString();

     QString fileName = QDir::homePath()
             + QLatin1String("/.cache/media-art/album-")
             + hash(artist)
             + QLatin1Char('-')
             + hash(title)
             + QLatin1String(".jpeg");

     return QUrl::fromLocalFile(fileName);
 }

 QString CoverArtModel::hash(const QString &identifier) const
 {
     if (identifier.isEmpty()) {
         return whitespace;
     } else {
         return QCryptographicHash::hash(
                 identifier.toLower().remove(illegalCharacters).simplified().toUtf8(),
                 QCryptographicHash::Md5).toHex();
     }
 }
 #endif