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diff --git a/src/libs/widgets/common/previewwidget.h b/src/libs/widgets/common/previewwidget.h
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+/* ============================================================
+ *
+ * This file is a part of digiKam project
+ * http://www.digikam.org
+ *
+ * Date        : 2006-06-13
+ * Description : a widget to display an image preview
+ *
+ * Copyright (C) 2006-2007 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 PREVIEWWIDGET_H
+#define PREVIEWWIDGET_H
+
+// TQt includes.
+
+#include <tqscrollview.h>
+
+// Local includes.
+
+#include "digikam_export.h"
+
+class TQPainter;
+class TQPixmap;
+class TQColor;
+
+namespace Digikam
+{
+
+class PreviewWidgetPriv;
+
+class DIGIKAM_EXPORT PreviewWidget : public TQScrollView
+{
+TQ_OBJECT
+  
+
+public:
+
+    PreviewWidget(TQWidget *parent=0);
+    ~PreviewWidget();
+
+    void   setZoomFactor(double z);
+    void   setZoomFactor(double z, bool centerView);
+    void   setZoomFactorSnapped(double z);
+    
+    void   setBackgroundColor(const TQColor& color);
+    void   fitToWindow();
+    bool   isFitToWindow();
+    void   toggleFitToWindow();
+    void   toggleFitToWindowOr100();
+  
+    int    zoomWidth();
+    int    zoomHeight();
+    bool   maxZoom();
+    bool   minZoom();
+    double snapZoom(double zoom);
+    
+    double zoomFactor();
+    double zoomMax();
+    double zoomMin();
+    void   setZoomMax(double z);
+    void   setZoomMin(double z);
+
+signals:
+
+    void signalRightButtonClicked();
+    void signalLeftButtonClicked();    
+    void signalShowNextImage();
+    void signalShowPrevImage();
+    void signalZoomFactorChanged(double);
+    void signalContentsMovedEvent(bool);
+
+public slots:
+
+    void slotIncreaseZoom();
+    void slotDecreaseZoom();
+    void slotReset();
+
+protected:
+
+    bool m_movingInProgress;
+
+protected:
+
+    enum AutoZoomMode
+    {
+        ZoomInOrOut,
+        ZoomInOnly
+    };
+
+    double calcAutoZoomFactor(AutoZoomMode mode = ZoomInOrOut);
+    int    tileSize();
+    void   updateAutoZoom(AutoZoomMode mode = ZoomInOrOut);
+    void   updateContentsSize();
+    TQRect  previewRect();
+
+    virtual void resizeEvent(TQResizeEvent *);
+    virtual void viewportPaintEvent(TQPaintEvent *);
+    virtual void contentsMousePressEvent(TQMouseEvent *);
+    virtual void contentsMouseMoveEvent(TQMouseEvent *);
+    virtual void contentsMouseReleaseEvent(TQMouseEvent *);
+    virtual void contentsWheelEvent(TQWheelEvent *);
+    virtual void setContentsSize();
+    virtual void viewportPaintExtraData(){};
+    virtual int  previewWidth()=0;
+    virtual int  previewHeight()=0;
+    virtual bool previewIsNull()=0;
+    virtual void resetPreview()=0;
+    virtual void paintPreview(TQPixmap *pix, int sx, int sy, int sw, int sh)=0;
+    virtual void zoomFactorChanged(double zoom);
+   
+private:
+
+    PreviewWidgetPriv* d;
+};
+
+}  // NameSpace Digikam
+
+#endif /* PREVIEWWIDGET_H */