// Copyright (C) 2016 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only

#ifndef QPAINTDEVICEWINDOW_P_H

#define QPAINTDEVICEWINDOW_P_H

//

//  W A R N I N G

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

//

// This file is not part of the Qt API.  It exists purely as an

// implementation detail.  This header file may change from version to

// version without notice, or even be removed.

//

// We mean it.

//

#include <QtGui/private/qtguiglobal_p.h>

#include <QtGui/QPaintDeviceWindow>

#include <QtCore/QCoreApplication>

#include <QtGui/private/qwindow_p.h>

#include <QtGui/QPaintEvent>

QT_BEGIN_NAMESPACE

class Q_GUI_EXPORT QPaintDeviceWindowPrivate : public QWindowPrivate

{

    Q_DECLARE_PUBLIC(QPaintDeviceWindow)

public:

    QPaintDeviceWindowPrivate();

    ~QPaintDeviceWindowPrivate() override;

    virtual void handleResizeEvent() {}

    virtual void beginPaint(const QRegion &region)

    {

        Q_UNUSED(region);

    }

    virtual void endPaint()

    {

    }

    virtual void flush(const QRegion &region)

    {

        Q_UNUSED(region);

    }

    bool paint(const QRegion &region)

    {

        Q_Q(QPaintDeviceWindow);

        QRegion toPaint = region & dirtyRegion;

        if (toPaint.isEmpty())

            return false;

        // Clear the region now. The overridden functions may call update().

        dirtyRegion -= toPaint;

        beginPaint(toPaint);

        QPaintEvent paintEvent(toPaint);

        q->paintEvent(&paintEvent);

        endPaint();

        return true;

    }

    void doFlush(const QRegion &region)

    {

        QRegion toFlush = region;

        if (paint(toFlush))

            flush(toFlush);

    }

    void handleUpdateEvent()

    {

        if (dirtyRegion.isEmpty())

            return;

        doFlush(dirtyRegion);

    }

    void markWindowAsDirty()

    {

        Q_Q(QPaintDeviceWindow);

        dirtyRegion = QRect(QPoint(0, 0), q->size());

    }

private:

    QRegion dirtyRegion;

};

QT_END_NAMESPACE

#endif //QPAINTDEVICEWINDOW_P_H