mirror of
https://github.com/crystalidea/qt6windows7.git
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73 lines
1.5 KiB
C++
73 lines
1.5 KiB
C++
// Copyright (C) 2017 The Qt Company Ltd.
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// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
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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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winId();
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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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