source: tests/modal/modal.cpp@ 1110

#include <QDebug>
#include <QtGui>

class MyMainWidget : public QWidget
{
    Q_OBJECT

public:

    MyMainWidget (QWidget *aParent = 0, Qt::WindowFlags aFlags = 0)
        : QWidget (aParent, aFlags)
    {
        setWindowTitle (QString ("MyMainWidget (0x%1)")
                        .arg ((intptr_t) this, 8, 16, QChar('0')));

        QHBoxLayout *pbLayout = new QHBoxLayout();

        for (int i = 1; i <= 10; ++ i)
        {
            QPushButton *pb = new QPushButton (QString::number (i), this);
            connect (pb, SIGNAL (clicked()), this, SLOT (nextTest()));
            pbLayout->addWidget (pb);
        }

        mPBClone = new QPushButton ("Clone", this);
        connect (mPBClone, SIGNAL (clicked()), this, SLOT (clone()));

        mPBCloneModal = new QPushButton ("Modal Clone", this);
        connect (mPBCloneModal, SIGNAL (clicked()), this, SLOT (cloneModal()));

        mPBCloneAppModal = new QPushButton ("App Modal Clone", this);
        connect (mPBCloneAppModal, SIGNAL (clicked()), this, SLOT (cloneAppModal()));

        QVBoxLayout *layout = new QVBoxLayout();
        layout->addLayout (pbLayout);
        layout->addWidget (mPBClone);
        layout->addWidget (mPBCloneModal);
        layout->addWidget (mPBCloneAppModal);
        setLayout (layout);
    }

    virtual ~MyMainWidget()
    {
    }

    void test (int aNum, QWidget *aWgt, const QString &aText)
    {
        aWgt->setAttribute (Qt::WA_DeleteOnClose);

        aWgt->setWindowTitle (QString ("[%1] %2 (0x%3)")
                              .arg (aNum)
                              .arg (aWgt->metaObject()->className())
                              .arg ((intptr_t) aWgt, 8, 16, QChar('0')));

        QString newText = QString (
                    "[%1] %2\n\n"
                    "parentWidget() is %3\n"
                    "className() is %4\n"
                    "isWindow() is %5\n"
                    "windowFlags() is 0x%6\n"
                    "windowModality() is %7")
                .arg (aNum)
                .arg (aText)
                .arg (aWgt->parentWidget() ? aWgt->parentWidget()->metaObject()
                                             ->className()
                                           : "<none>")
                .arg (aWgt->metaObject()->className())
                .arg (aWgt->isWindow())
                .arg (aWgt->windowFlags(), 8, 16, QLatin1Char ('0'))
                .arg (aWgt->windowModality());

        if (aWgt->inherits ("QMessageBox"))
        {
            static_cast <QMessageBox *> (aWgt)->setText (newText);
        }
        else
        {
            QLabel *label = new QLabel (aWgt);
            label->setText (newText);

            QVBoxLayout *layout = new QVBoxLayout();
            layout->addWidget (label);
            aWgt->setLayout (layout);
        }

        aWgt->show();
    }

public slots:

    void nextTest()
    {
        int num = static_cast <QPushButton *> (sender())->text().toInt();
        switch (num)
        {
        case 1:
        {
            QWidget *w = new QWidget();
            test (num, w,
                  "QWidget().\n"
                  "Should have a taskbar entry.\n"
                  "Should not be always on top of parent.\n"
                  "Should not block parent.");
            break;
        }
        case 2:
        {
            QWidget *w = new QWidget (this, Qt::Window);
            test (num, w,
                  "QWidget (this, Qt::Window).\n"
                  "Should not have a taskbar entry.\n"
                  "Should be always on top of parent.\n"
                  "Should not block parent.");
            break;
        }
        case 3:
        {
            QWidget *w = new QDialog();
            test (num, w,
                  "QDialog().\n"
                  "Should have a taskbar entry.\n"
                  "Should not be always on top of parent.\n"
                  "Should not block parent.");
            break;
        }
        case 4:
        {
            QWidget *w = new QDialog (this);
            test (num, w,
                  "QDialog(this).\n"
                  "Should not have a taskbar entry.\n"
                  "Should be always on top of parent.\n"
                  "Should not block parent.");
            break;
        }
        case 5:
        {
            QWidget *w = new QMessageBox();
            test (num, w,
                  "QMessageBox().\n"
                  "Should have a taskbar entry.\n"
                  "Should be always on top of parent.\n"
                  "Should block parent.");
            break;
        }
        case 6:
        {
            QWidget *w = new QMessageBox (this);
            test (num, w,
                  "QMessageBox (this).\n"
                  "Should not have a taskbar entry.\n"
                  "Should be always on top of parent.\n"
                  "Should block parent.");
            break;
        }
        case 7:
        {
            QWidget *w = new QWidget();
            w->setWindowModality (Qt::WindowModal);
            test (num, w,
                  "QWidget() - WindowModal.\n"
                  "Should have a taskbar entry.\n"
                  "Should not be always on top of parent.\n"
                  "Should not block parent.");
            break;
        }
        case 8:
        {
            QWidget *w = new QWidget (this, Qt::Window);
            w->setWindowModality (Qt::WindowModal);
            test (num, w,
                  "QWidget (this, Qt::Window) - WindowModal.\n"
                  "Should not have a taskbar entry.\n"
                  "Should be always on top of parent.\n"
                  "Should block parent.");
            break;
        }
        case 9:
        {
            QWidget *w = new QWidget(0, Qt::Dialog);
            w->setWindowModality (Qt::ApplicationModal);
            test (num, w,
                  "QWidget() - ApplicationModal.\n"
                  "Should have a taskbar entry.\n"
                  "Should be always on top of parent.\n"
                  "Should block parent.");
            break;
        }
        case 10:
        {
            QWidget *w = new QWidget (this, Qt::Window);
            w->setWindowModality (Qt::ApplicationModal);
            test (num, w,
                  "QWidget (this, Qt::Window) - ApplicationModal.\n"
                  "Should not have a taskbar entry.\n"
                  "Should be always on top of parent.\n"
                  "Should block parent.");
            break;
        }
        default:
            return;
        }
    }

    void clone()
    {
        QWidget *w = new MyMainWidget ();
        w->setAttribute (Qt::WA_DeleteOnClose);
        w->show();
    }

    void cloneModal()
    {
        QWidget *w = new MyMainWidget (this, Qt::Window);
        w->setAttribute (Qt::WA_DeleteOnClose);
        w->setWindowModality (Qt::WindowModal);
        w->setWindowTitle (QString("[M] ") + w->windowTitle());
        w->show();
    }

    void cloneAppModal()
    {
        QWidget *w = new MyMainWidget();
        w->setAttribute (Qt::WA_DeleteOnClose);
        w->setWindowModality (Qt::ApplicationModal);
        w->setWindowTitle (QString("[AM] ") + w->windowTitle());
        w->show();
    }

private:

    QPushButton *mPBClone;
    QPushButton *mPBCloneModal;
    QPushButton *mPBCloneAppModal;
};

int main (int argc, char **argv)
{
    QApplication app (argc, argv);
    app.setQuitOnLastWindowClosed (true);

    MyMainWidget *mainWidget = new MyMainWidget();
    mainWidget->show();

    return app.exec();
}

#include "modal.moc"