/****************************************************************************
**
** Copyright (C) 2017 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
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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 "rasterwindow.h"

RasterWindow::RasterWindow(QWindow *parent)
    : QWindow(parent)
    , m_update_pending(false)
{
    m_backingStore = new QBackingStore(this);
    create();

    setGeometry(100, 100, 300, 200);
}


bool RasterWindow::event(QEvent *event)
{
    if (event->type() == QEvent::UpdateRequest) {
        m_update_pending = false;
        renderNow();
        return true;
    }
    return QWindow::event(event);
}

void RasterWindow::renderLater()
{
    if (!m_update_pending) {
        m_update_pending = true;
        QCoreApplication::postEvent(this, new QEvent(QEvent::UpdateRequest));
    }
}

void RasterWindow::resizeEvent(QResizeEvent *resizeEvent)
{
    m_backingStore->resize(resizeEvent->size());
    if (isExposed())
        renderNow();
}

void RasterWindow::exposeEvent(QExposeEvent *)
{
    if (isExposed()) {
        renderNow();
    }
}

void RasterWindow::renderNow()
{
    if (!isExposed())
        return;

    QRect rect(0, 0, width(), height());
    m_backingStore->beginPaint(rect);

    QPaintDevice *device = m_backingStore->paintDevice();
    QPainter painter(device);

    painter.fillRect(0, 0, width(), height(), Qt::white);
    render(&painter);

    m_backingStore->endPaint();
    m_backingStore->flush(rect);
}

void RasterWindow::render(QPainter *painter)
{
    painter->drawText(QRectF(0, 0, width(), height()), Qt::AlignCenter, QStringLiteral("QWindow"));
}