1  MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
2  {
3     ui->setupUi(this);
4     ui->volumeLCD->setPalette(Qt::red);
5     ui->lengthSlider->setTickPosition(QSlider::TicksAbove);
6     ui->lengthSlider->setTickInterval(10);
7     ui->lengthSlider->setSingleStep(1);
8     ui->lengthSlider->setMinimum(0);
9     ui->lengthSlider->setMaximum(100);
10    ui->volumeDial->setNotchesVisible(true);
11    ui->volumeDial->setMinimum(0);
12    ui->volumeDial->setMaximum(100);
13    QObject::connect(ui->volumeDial,
              SIGNAL(valueChanged(int)),
              ui->volumeLCD ,   SLOT(display(int)));
14    QObject::connect(ui->lengthSlider,
              SIGNAL(valueChanged(int)),
              ui->volumeLCD   , SLOT(display(int)));
15 }
