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# main.cpp Example File
tutorial/t9/main.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2005-2005 Trolltech AS. 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 <QPushButton>

        #include "cannonfield.h"
        #include "lcdrange.h"

        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()));

            LCDRange *angle = new LCDRange;
            angle->setRange(5, 70);

            CannonField *cannonField = new CannonField;

            connect(angle, SIGNAL(valueChanged(int)),
                    cannonField, SLOT(setAngle(int)));
            connect(cannonField, SIGNAL(angleChanged(int)),
                    angle, SLOT(setValue(int)));

            QGridLayout *gridLayout = new QGridLayout;
            gridLayout->addWidget(quit, 0, 0);
            gridLayout->addWidget(angle, 1, 0);
            gridLayout->addWidget(cannonField, 1, 1, 2, 1);
            gridLayout->setColumnStretch(1, 10);
            setLayout(gridLayout);

            angle->setValue(60);
            angle->setFocus();
        }

        int main(int argc, char *argv[])
        {
            QApplication app(argc, argv);
            MyWidget widget;
            widget.setGeometry(100, 100, 500, 355);
            widget.show();
            return app.exec();
        }