previewlayout.h

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/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2010-04-30
 * Description : Layout for an item on image preview
 *
 * Copyright (C) 2010-2011 by Marcel Wiesweg <marcel dot wiesweg at gmx dot de>
 *
 * 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_PREVIEW_LAYOUT_H
#define DIGIKAM_PREVIEW_LAYOUT_H
 
// Qt includes
 
#include <QFlags>
#include <QObject>
#include <QPointF>
 
// Local includes
 
#include "digikam_export.h"
 
namespace Digikam
{
 
class GraphicsDImgItem;
class GraphicsDImgView;
 
class DIGIKAM_EXPORT SinglePhotoPreviewLayout : public QObject
{
    Q_OBJECT
 
public:
 
    enum SetZoomFlag
    {
        JustSetFactor  = 0,
        CenterView     = 1 << 0,
        SnapZoomFactor = 1 << 1
    };
    Q_DECLARE_FLAGS(SetZoomFlags, SetZoomFlag)
 
public:
 
    explicit SinglePhotoPreviewLayout(QObject* const parent);
    ~SinglePhotoPreviewLayout() override;
 
    void setGraphicsView(GraphicsDImgView* const view);
 
    void addItem(GraphicsDImgItem* const item);
 
    bool   isFitToWindow()  const;
    double zoomFactor() const;
    double realZoomFactor() const;
 
    double maxZoomFactor()  const;
    double minZoomFactor()  const;
    void   setMaxZoomFactor(double z);
    void   setMinZoomFactor(double z);
    bool   atMaxZoom()      const;
    bool   atMinZoom()      const;
 
Q_SIGNALS:
 
    void fitToWindowToggled(bool fitToWindow);
    void zoomFactorChanged(double);
 
public Q_SLOTS:
 
    void increaseZoom(const QPoint& viewportAnchor = QPoint());
    void decreaseZoom(const QPoint& viewportAnchor = QPoint());
    void setZoomFactor(double z, const QPoint& viewportAnchor = QPoint(), SetZoomFlags flags = JustSetFactor);
    void setZoomFactor(double z, SetZoomFlags flags);
    void setZoomFactorSnapped(double z);
    void fitToWindow();
 
    void toggleFitToWindow();
 
    void toggleFitToWindowOr100();
 
    void updateZoomAndSize();
 
protected:
 
    void updateLayout();
 
private:
 
    SinglePhotoPreviewLayout(); // Disable default constructor.
 
    class Private;
    Private* const d;
};
 
Q_DECLARE_OPERATORS_FOR_FLAGS(SinglePhotoPreviewLayout::SetZoomFlags)
 
} // namespace Digikam
 
#endif // DIGIKAM_PREVIEW_LAYOUT_H