übernahme Code Shortcut

src/database.h

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+/*
+ * Copyright (c) 2013-2021 Meltytech, LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef DATABASE_H
+#define DATABASE_H
+
+#include <QDir>
+#include <QImage>
+#include <QTimer>
+
+class Database : public QObject
+{
+    Q_OBJECT
+    explicit Database(QObject *parent = 0);
+
+public:
+    static Database &singleton(QObject *parent = 0);
+
+    bool putThumbnail(const QString &hash, const QImage &image);
+    QImage getThumbnail(const QString &hash);
+
+private:
+    QDir thumbnailsDir();
+    QTimer m_deleteTimer;
+
+private slots:
+    void deleteOldThumbnails();
+};
+
+#define DB Database::singleton()
+
+#endif // DATABASE_H