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#ifndef QWINDOWSURFACE_P_H

#define QWINDOWSURFACE_P_H

//

//  W A R N I N G

//  -------------

//

// This file is not part of the Qt API.  It exists for the convenience

// of other Qt classes.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include <QtGui/qwidget.h>

QT_BEGIN_NAMESPACE

class QPaintDevice;

class QRegion;

class QRect;

class QPoint;

class QImage;

class QWindowSurfacePrivate;

class Q_GUI_EXPORT QWindowSurface

{

public:

    QWindowSurface(QWidget *window);

    virtual ~QWindowSurface();

    QWidget *window() const;

    virtual QPaintDevice *paintDevice() = 0;

    // 'widget' can be a child widget, in which case 'region' is in child widget coordinates and

    // offset is the (child) widget's offset in relation to the window surface. On QWS, 'offset'

    // can be larger than just the offset from the top-level widget as there may also be window

    // decorations which are painted into the window surface.

    virtual void flush(QWidget *widget, const QRegion &region, const QPoint &offset) = 0;

    virtual void setGeometry(const QRect &rect);

    QRect geometry() const;

    virtual bool scroll(const QRegion &area, int dx, int dy);

    virtual void beginPaint(const QRegion &);

    virtual void endPaint(const QRegion &);

    virtual QImage* buffer(const QWidget *widget);

    virtual QPixmap grabWidget(const QWidget *widget, const QRect& rectangle = QRect()) const;

    virtual QPoint offset(const QWidget *widget) const;

    inline QRect rect(const QWidget *widget) const;

    bool hasStaticContentsSupport() const;

    bool hasPartialUpdateSupport() const;

    void setStaticContents(const QRegion &region);

    QRegion staticContents() const;

protected:

    bool hasStaticContents() const;

    void setStaticContentsSupport(bool enable);

    void setPartialUpdateSupport(bool enable);

private:

    QWindowSurfacePrivate *d_ptr;

};

inline QRect QWindowSurface::rect(const QWidget *widget) const

{

    return widget->rect().translated(offset(widget));

}

QT_END_NAMESPACE

#endif // QWINDOWSURFACE_P_H