/****************************************************************************

**

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

** Contact: https://www.qt.io/licensing/

**

** This file is part of the QtGui module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** Commercial License Usage

** Licensees holding valid commercial Qt licenses may use this file in

** accordance with the commercial license agreement provided with the

** Software or, alternatively, in accordance with the terms contained in

** a written agreement between you and The Qt Company. For licensing terms

** and conditions see https://www.qt.io/terms-conditions. For further

** information use the contact form at https://www.qt.io/contact-us.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 3 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL3 included in the

** packaging of this file. Please review the following information to

** ensure the GNU Lesser General Public License version 3 requirements

** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.

**

** GNU General Public License Usage

** Alternatively, this file may be used under the terms of the GNU

** General Public License version 2.0 or (at your option) the GNU General

** Public license version 3 or any later version approved by the KDE Free

** Qt Foundation. The licenses are as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3

** included in the packaging of this file. Please review the following

** information to ensure the GNU General Public License requirements will

** be met: https://www.gnu.org/licenses/gpl-2.0.html and

** https://www.gnu.org/licenses/gpl-3.0.html.

**

** $QT_END_LICENSE$

**

****************************************************************************/

#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:

    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