main.cpp Example File
^{tutorial/t6/main.cpp}

    /****************************************************************************
    **
    ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
    ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
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    ** http://www.trolltech.com/products/qt/opensource.html
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    ** review the following information:
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    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
    **
    ****************************************************************************/

    #include <QApplication>
    #include <QFont>
    #include <QGridLayout>
    #include <QLCDNumber>
    #include <QPushButton>
    #include <QSlider>
    #include <QVBoxLayout>
    #include <QWidget>

    class LCDRange : public QWidget
    {
    public:
        LCDRange(QWidget *parent = 0);
    };

    LCDRange::LCDRange(QWidget *parent)
        : QWidget(parent)
    {
        QLCDNumber *lcd = new QLCDNumber(2);
        lcd->setSegmentStyle(QLCDNumber::Filled);

        QSlider *slider = new QSlider(Qt::Horizontal);
        slider->setRange(0, 99);
        slider->setValue(0);
        connect(slider, SIGNAL(valueChanged(int)),
                lcd, SLOT(display(int)));

        QVBoxLayout *layout = new QVBoxLayout;
        layout->addWidget(lcd);
        layout->addWidget(slider);
        setLayout(layout);
    }

    class MyWidget : public QWidget
    {
    public:
        MyWidget(QWidget *parent = 0);
    };

    MyWidget::MyWidget(QWidget *parent)
        : QWidget(parent)
    {
        QPushButton *quit = new QPushButton(tr("Quit"));
        quit->setFont(QFont("Times", 18, QFont::Bold));
        connect(quit, SIGNAL(clicked()), qApp, SLOT(quit()));

        QGridLayout *grid = new QGridLayout;
        for (int row = 0; row < 3; ++row) {
            for (int column = 0; column < 3; ++column) {
                LCDRange *lcdRange = new LCDRange;
                grid->addWidget(lcdRange, row, column);
            }
        }

        QVBoxLayout *layout = new QVBoxLayout;
        layout->addWidget(quit);
        layout->addLayout(grid);
        setLayout(layout);
    }

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