qt 6.5.1 original

tests/manual/transientwindow/CMakeLists.txt

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

tests/manual/transientwindow/main.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+#include "mainwindow.h"
+#include <QApplication>
+
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    MainWindow w;
+    w.show();
+
+    return a.exec();
+}

tests/manual/transientwindow/mainwindow.cpp

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+#include "mainwindow.h"
+#include <QDebug>
+
+MainWindow::MainWindow(QWidget *parent)
+    : QMainWindow(parent), m_showButton("Toggle visible", this), m_window(0)
+{
+    connect(&m_showButton, SIGNAL(clicked()), this, SLOT(toggleVisible()));
+    setWindowTitle(QString::fromLatin1("Main Window"));
+    m_showButton.setVisible(true);
+    setMinimumSize(300, 200);
+}
+
+MainWindow::~MainWindow()
+{
+}
+
+void MainWindow::toggleVisible()
+{
+    if (!m_window) {
+        m_window = new QWindow();
+        m_window->setTransientParent(windowHandle());
+        m_window->setMinimumSize(QSize(200, 100));
+        m_window->setTitle("Transient Window");
+        m_window->setFlags(Qt::Dialog);
+    }
+    m_window->setVisible(!m_window->isVisible());
+}

tests/manual/transientwindow/mainwindow.h

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+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QMainWindow>
+#include <QPushButton>
+#include <QWindow>
+
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    MainWindow(QWidget *parent = nullptr);
+    ~MainWindow();
+
+public slots:
+    void toggleVisible();
+
+private:
+    QPushButton m_showButton;
+    QWindow* m_window;
+};
+
+#endif // MAINWINDOW_H

tests/manual/transientwindow/transientwindow.pro

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+QT       += core gui widgets
+TARGET = transientwindow
+TEMPLATE = app
+SOURCES += main.cpp\
+        mainwindow.cpp
+HEADERS  += mainwindow.h