main.cpp

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//! [includes]
#include <QApplication>
#include <QFont>
#include <QLCDNumber>
#include <QPushButton>
#include <QSlider>
#include <QVBoxLayout>
#include <QWidget>
//! [includes]

//! [class declaration]
class MyWidget : public QWidget
{
public:
    MyWidget(QWidget *parent = 0);
};
//! [class declaration]

//! [constructor] //! [3]
MyWidget::MyWidget(QWidget *parent)
    : QWidget(parent)
{
    QPushButton *quit = new QPushButton(tr("Quit"));
    quit->setFont(QFont("Times", 18, QFont::Bold));

    QLCDNumber *lcd = new QLCDNumber(2);
    lcd->setSegmentStyle(QLCDNumber::Filled);
//! [3]

//! [4]
    QSlider *slider = new QSlider(Qt::Horizontal);
    slider->setRange(0, 99);
    slider->setValue(0);
//! [4]

    connect(quit, SIGNAL(clicked()), qApp, SLOT(quit()));
//! [7]
    connect(slider, SIGNAL(valueChanged(int)),
            lcd, SLOT(display(int)));
//! [7]

//! [layout]
    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(quit);
    layout->addWidget(lcd);
    layout->addWidget(slider);
    setLayout(layout);
//! [layout]
}
//! [constructor]

//! [main]
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    MyWidget widget;
    widget.show();
    return app.exec();
}
//! [main]