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#include <QtGui>

class Updater : public QObject

{

    Q_OBJECT

public:

    Updater(QWidget *widget);

public slots:

    void adjustSize();

private:

    QWidget *widget;

};

Updater::Updater(QWidget *widget)

    : widget(widget)

{

}

void Updater::adjustSize()

{

    widget->adjustSize();

}

int main(int argc, char *argv[])

{

    QApplication app(argc, argv);

    QLabel *label = new QLabel("My label");

    QLineEdit *editor = new QLineEdit("New text");

    QWidget window;

    //Updater updater(&label);

    QObject::connect(editor, SIGNAL(textChanged(const QString &)),

                     label, SLOT(setText(const QString &)));

    //QObject::connect(editor, SIGNAL(textChanged(const QString &)),

    //                 &updater, SLOT(adjustSize()));

    //editor.show();

    //label.show();

    QVBoxLayout *layout = new QVBoxLayout;

    layout->addWidget(label);

    layout->addWidget(editor);

    window.setLayout(layout);

    window.show();

    return app.exec();

}

#include "main.moc"