96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
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/****************************************************************************
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**
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** Copyright (C) 2017 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the test suite of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "rasterwindow.h"
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RasterWindow::RasterWindow(QWindow *parent)
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: QWindow(parent)
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, m_update_pending(false)
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{
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m_backingStore = new QBackingStore(this);
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create();
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setGeometry(100, 100, 300, 200);
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}
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bool RasterWindow::event(QEvent *event)
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{
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if (event->type() == QEvent::UpdateRequest) {
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m_update_pending = false;
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renderNow();
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return true;
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}
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return QWindow::event(event);
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}
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void RasterWindow::renderLater()
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{
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if (!m_update_pending) {
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m_update_pending = true;
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QCoreApplication::postEvent(this, new QEvent(QEvent::UpdateRequest));
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}
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}
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void RasterWindow::resizeEvent(QResizeEvent *resizeEvent)
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{
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m_backingStore->resize(resizeEvent->size());
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if (isExposed())
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renderNow();
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}
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void RasterWindow::exposeEvent(QExposeEvent *)
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{
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if (isExposed()) {
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renderNow();
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}
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}
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void RasterWindow::renderNow()
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{
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if (!isExposed())
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return;
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QRect rect(0, 0, width(), height());
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m_backingStore->beginPaint(rect);
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QPaintDevice *device = m_backingStore->paintDevice();
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QPainter painter(device);
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painter.fillRect(0, 0, width(), height(), Qt::white);
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render(&painter);
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m_backingStore->endPaint();
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m_backingStore->flush(rect);
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}
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void RasterWindow::render(QPainter *painter)
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{
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painter->drawText(QRectF(0, 0, width(), height()), Qt::AlignCenter, QStringLiteral("QWindow"));
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}
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