qt5base-lts/tests/auto/gui/kernel/qguiapplication/tst_qguiapplication.cpp

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#include <QtTest/QtTest>
#include <QtGui/QGuiApplication>
#include <QDebug>

class tst_QGuiApplication: public QObject
{
    Q_OBJECT

private slots:
    void focusObject();
};

class DummyWindow : public QWindow
{
public:
    DummyWindow() : m_focusObject(0) {}

    virtual QObject *focusObject() const
    {
        return m_focusObject;
    }

    void setFocusObject(QObject *object)
    {
        m_focusObject = object;
        emit focusObjectChanged(object);
    }

    QObject *m_focusObject;
};


void tst_QGuiApplication::focusObject()
{
    int argc = 0;
    QGuiApplication app(argc, 0);

    QObject obj1, obj2, obj3;
    DummyWindow window1;
    DummyWindow window2;
    window1.show();

    QSignalSpy spy(&app, SIGNAL(focusObjectChanged(QObject *)));


    // verify active window focus propagates to qguiapplication
    QTest::qWaitForWindowShown(&window1);
    window1.requestActivateWindow();
    QTRY_COMPARE(app.focusWindow(), &window1);

    window1.setFocusObject(&obj1);
    QCOMPARE(app.focusObject(), &obj1);
    QCOMPARE(spy.count(), 1);

    spy.clear();
    window1.setFocusObject(&obj2);
    QCOMPARE(app.focusObject(), &obj2);
    QCOMPARE(spy.count(), 1);

    spy.clear();
    window2.setFocusObject(&obj3);
    QCOMPARE(app.focusObject(), &obj2); // not yet changed
    window2.show();
    QTest::qWaitForWindowShown(&window2);
    QTRY_COMPARE(app.focusWindow(), &window2);
    QCOMPARE(app.focusObject(), &obj3);
    QCOMPARE(spy.count(), 1);

    // focus change on unfocused window does not show
    spy.clear();
    window1.setFocusObject(&obj1);
    QCOMPARE(spy.count(), 0);
    QCOMPARE(app.focusObject(), &obj3);
}


QTEST_APPLESS_MAIN(tst_QGuiApplication)
#include "tst_qguiapplication.moc"