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Let's look at what happens when the user operates the slider. The slider sees that its value has changed and emits the [http://doc.qt.nokia.com/latest/qabstractslider.html#valueChanged QAbstractSlider::valueChanged()] signal. That signal is connected both to the [http://doc.qt.nokia.com/latest/qlcdnumber.html#intValue-prop QLCDNumber::display()] slot of the [http://doc.qt.nokia.com/latest/qlcdnumber.html Qt::LCDNumber] and to the '''<tt>valueChanged()</tt>''' signal of the '''<tt>LCDRange</tt>'''.

Когда пользователь двигает ползунок, ползунок вырабатывает сигнал QAbstractSlider::valueChanged(). Этот сигнал соединён одновременно со слотом QLCDNumber::display() объекта класса Qt::LCDNumber и с сигналом valueChanged() объекта класса LCDRange.