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# 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
        ** General Public Licensing requirements will be met:
        ** http://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
        ** http://www.trolltech.com/products/qt/licensing.html or contact the
        ** sales department at sales@trolltech.com.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** 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();
        }