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main.cpp Example File
^{tutorial/t8/main.cpp}

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    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
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    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
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    #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();
    }