camerathumbsctrl.h

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/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2011-08-03
 * Description : digital camera thumbnails controller
 *
 * Copyright (C) 2011-2022 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * 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 2, 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.
 *
 * ============================================================ */
 
#ifndef DIGIKAM_CAMERA_THUMBS_CTRL_H
#define DIGIKAM_CAMERA_THUMBS_CTRL_H
 
// Qt includes
 
#include <QWidget>
#include <QString>
#include <QImage>
#include <QPixmap>
#include <QUrl>
 
// Local includes
 
#include "camiteminfo.h"
#include "digikam_export.h"
 
namespace Digikam
{
 
class CameraController;
 
typedef QPair<CamItemInfo, QPixmap> CachedItem;
 
class DIGIKAM_GUI_EXPORT CameraThumbsCtrl : public QObject
{
    Q_OBJECT
 
public:
 
    explicit CameraThumbsCtrl(CameraController* const ctrl, QWidget* const parent);
    ~CameraThumbsCtrl()                                                override;
 
    bool getThumbInfo(const CamItemInfo& info, CachedItem& item) const;
 
    void setCacheSize(int numberOfItems);
    void clearCache();
 
    void updateThumbInfoFromCache(const CamItemInfo& info);
 
    CameraController* cameraController()                         const;
 
Q_SIGNALS:
 
    void signalThumbInfoReady(const CamItemInfo&);
 
private Q_SLOTS:
 
    void slotThumbInfo(const QString&, const QString&, const CamItemInfo&, const QImage&);
    void slotThumbInfoFailed(const QString&, const QString&, const CamItemInfo&);
 
private:
 
    void removeItemFromCache(const QUrl& url);
    void putItemToCache(const QUrl& url, const CamItemInfo&, const QPixmap& thumb);
    bool hasItemFromCache(const QUrl& url)                       const;
    const CachedItem* retrieveItemFromCache(const QUrl& url)     const;
 
private:
 
    class Private;
    const QScopedPointer<Private> d;
};
 
} // namespace Digikam
 
#endif // DIGIKAM_CAMERA_THUMBS_CTRL_H