/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the test suite of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
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****************************************************************************/

#include <qwindow.h>
#include <qbackingstore.h>
#include <qpainter.h>

#include <QTest>

#include <QEvent>

// For QSignalSpy slot connections.
Q_DECLARE_METATYPE(Qt::ScreenOrientation)

class tst_QBackingStore : public QObject
{
    Q_OBJECT

private slots:
    void flush();
};

class Window : public QWindow
{
public:
    Window()
        : backingStore(this)
    {
    }

    void resizeEvent(QResizeEvent *) override
    {
        backingStore.resize(size());
    }

    void exposeEvent(QExposeEvent *event) override
    {
        QRect rect(QPoint(), size());

        backingStore.beginPaint(rect);

        QPainter p(backingStore.paintDevice());
        p.fillRect(rect, Qt::white);
        p.end();

        backingStore.endPaint();

QT_WARNING_PUSH
QT_WARNING_DISABLE_DEPRECATED
        backingStore.flush(event->region().boundingRect());
QT_WARNING_POP
    }

private:
    QBackingStore backingStore;
};

void tst_QBackingStore::flush()
{
    Window window;
    window.setGeometry(20, 20, 200, 200);
    window.showMaximized();

    QTRY_VERIFY(window.isExposed());
}

#include <tst_qbackingstore.moc>
QTEST_MAIN(tst_QBackingStore);