qt 6.5.1 original

tests/manual/windowactivation/main.cpp

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+// Copyright (C) 2021 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QtWidgets>
+
+class RasterWindow : public QRasterWindow
+{
+    Q_OBJECT
+
+public:
+    RasterWindow(const QColor &color)
+        : m_color(color)
+    {
+    }
+
+protected:
+    void paintEvent(QPaintEvent *)
+    {
+        QPainter p(this);
+        p.fillRect(QRect(0, 0, width(), height()), m_color);
+    }
+
+private:
+    QColor m_color;
+};
+
+class ActivateButton : public QPushButton
+{
+    Q_OBJECT
+public:
+    ActivateButton(const QString &text, QWindow *window)
+        : QPushButton(text)
+    {
+        connect(this, &QPushButton::clicked, window, [window](){
+            window->requestActivate();
+        });
+        connect(window, &QWindow::activeChanged, this, [this, window](){
+            setPalette(window->isActive() ? QPalette(Qt::red) : qApp->palette());
+        });
+    }
+};
+
+class Controller : public QWidget
+{
+    Q_OBJECT
+public:
+    Controller() {
+        setWindowTitle("Controller window");
+        auto *ed1 = new QTextEdit;
+        ed1->setWindowTitle("Editor 1");
+        ed1->show();
+        auto *ed2 = new QTextEdit;
+        ed2->setWindowTitle("Editor 2");
+        ed2->show();
+
+        auto *win1 = new RasterWindow(Qt::red);
+        win1->setTitle("Window 1");
+        win1->resize(300, 200);
+        win1->show();
+
+        auto *win2 = new RasterWindow(Qt::green);
+        win2->setTitle("Window 2");
+        win2->resize(300, 200);
+        win2->show();
+
+        auto *noFocus = new RasterWindow(Qt::black);
+        noFocus->setTitle("No focus");
+        noFocus->resize(300, 200);
+        noFocus->setFlags(noFocus->flags() | Qt::WindowDoesNotAcceptFocus);
+        noFocus->show();
+
+        lab = new QLabel(this);
+        lab->move(5, 5);
+        connect(qApp, &QGuiApplication::focusObjectChanged, this, &Controller::updateInfo);
+
+        auto *topLayout = new QVBoxLayout(this);
+        topLayout->addWidget(lab);
+
+        topLayout->addWidget(new ActivateButton("Activate editor 1", ed1->windowHandle()));
+        topLayout->addWidget(new ActivateButton("Activate editor 2", ed2->windowHandle()));
+        topLayout->addWidget(new ActivateButton("Activate window 1", win1));
+        topLayout->addWidget(new ActivateButton("Activate window 2", win2));
+
+        topLayout->addStretch();
+        QPushButton *quitButton = new QPushButton("Quit");
+        topLayout->addWidget(quitButton);
+        connect(quitButton, &QPushButton::clicked, this, [](){
+            QApplication::quit();
+        });
+
+        resize(800, 600);
+    }
+
+public slots:
+    void updateInfo() {
+        QString outString;
+        QWindow *fWin = QGuiApplication::focusWindow();
+        QString windowTitle = fWin ? fWin->title() : QString{};
+        QWidget *aWdg = QApplication::activeWindow();
+        QString widgetTitle = aWdg ? aWdg->windowTitle() : QString{};
+        QDebug(&outString) << "focus window" << fWin << windowTitle
+                           << "\nfocus object" << QGuiApplication::focusObject()
+                           << "\nfocus widget" << QApplication::focusWidget()
+                           << "\nactive widget" << aWdg << widgetTitle;
+        lab->setText(outString);
+    }
+
+private:
+    QLabel *lab = nullptr;
+};
+
+
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+
+    Controller controller;
+    controller.show();
+    controller.updateInfo();
+
+    return app.exec();
+}
+
+#include "main.moc"

tests/manual/windowactivation/windowactivation.pro

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+QT += widgets
+TEMPLATE = app
+TARGET = windowactivation
+INCLUDEPATH += .
+
+SOURCES += main.cpp