qt 6.5.1 original

tests/manual/xembed/qt-client-raster/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## qt-client-raster Binary:
+#####################################################################
+
+qt_internal_add_manual_test(qt-client-raster
+    GUI
+    SOURCES
+        main.cpp
+        rasterwindow.cpp rasterwindow.h
+    LIBRARIES
+        Qt::Gui
+)

tests/manual/xembed/qt-client-raster/main.cpp

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+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "rasterwindow.h"
+#include <QDebug>
+
+int main(int argc, char **argv)
+{
+    QGuiApplication app(argc, argv);
+
+    QStringList args = app.arguments();
+
+    WId winId = 0;
+    if (args.count() > 1) {
+        bool ok;
+        winId = args[1].toUInt(&ok);
+        Q_ASSERT(ok);
+    }
+
+    RasterWindow window;
+
+    QWindow *foreign = QWindow::fromWinId(winId);
+    Q_ASSERT(foreign != 0);
+
+    window.setParent(foreign);
+    window.show();
+
+    return app.exec();
+}

tests/manual/xembed/qt-client-raster/qt-client-raster.pro

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+TEMPLATE = app
+TARGET= qt-client-raster
+QT += gui
+
+SOURCES += \
+    main.cpp \
+    rasterwindow.cpp
+HEADERS += \
+    rasterwindow.h

tests/manual/xembed/qt-client-raster/rasterwindow.cpp

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+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "rasterwindow.h"
+
+RasterWindow::RasterWindow(QWindow *parent)
+    : QWindow(parent)
+    , m_update_pending(false)
+{
+    winId();
+
+    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"));
+}

tests/manual/xembed/qt-client-raster/rasterwindow.h

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+// Copyright (C) 2017 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#ifndef RASTERWINDOW_H
+#define RASTERWINDOW_H
+
+#include <QtGui>
+
+class RasterWindow : public QWindow
+{
+    Q_OBJECT
+public:
+    explicit RasterWindow(QWindow *parent = nullptr);
+
+    virtual void render(QPainter *painter);
+
+public slots:
+    void renderLater();
+    void renderNow();
+
+protected:
+    bool event(QEvent *event) override;
+
+    void resizeEvent(QResizeEvent *event) override;
+    void exposeEvent(QExposeEvent *event) override;
+
+private:
+    QBackingStore *m_backingStore;
+    bool m_update_pending;
+};
+
+#endif // RASTERWINDOW_H