Qt Tutorial - t12/main.cpp

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# Source code for tutorial 12: main.cpp

    /****************************************************************
    **
    ** Qt tutorial 12
    **
    ****************************************************************/

    #include <qapplication.h>
    #include <qpushbutton.h>
    #include <qlcdnumber.h>
    #include <qfont.h>
    #include <qlayout.h>

    #include "lcdrange.h"
    #include "cannon.h"

    class MyWidget: public QWidget
    {
    public:
        MyWidget( QWidget *parent=0, const char *name=0 );
    };

    MyWidget::MyWidget( QWidget *parent, const char *name )
            : QWidget( parent, name )
    {
        QPushButton *quit = new QPushButton( "&Quit", this, "quit" );
        quit->setFont( QFont( "Times", 18, QFont::Bold ) );

        connect( quit, SIGNAL(clicked()), qApp, SLOT(quit()) );

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

        LCDRange *force  = new LCDRange( "FORCE", this, "force" );
        force->setRange( 10, 50 );

        CannonField *cannonField = new CannonField( this, "cannonField" );

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

        connect( force, SIGNAL(valueChanged(int)),
                 cannonField, SLOT(setForce(int)) );
        connect( cannonField, SIGNAL(forceChanged(int)),
                 force, SLOT(setValue(int)) );

        QPushButton *shoot = new QPushButton( "&Shoot", this, "shoot" );
        shoot->setFont( QFont( "Times", 18, QFont::Bold ) );

        connect( shoot, SIGNAL(clicked()), cannonField, SLOT(shoot()) );

        QGridLayout *grid = new QGridLayout( this, 2, 2, 10 );
        grid->addWidget( quit, 0, 0 );
        grid->addWidget( cannonField, 1, 1 );
        grid->setColStretch( 1, 10 );

        QVBoxLayout *leftBox = new QVBoxLayout;
        grid->addLayout( leftBox, 1, 0 );
        leftBox->addWidget( angle );
        leftBox->addWidget( force );

        QHBoxLayout *topBox = new QHBoxLayout;
        grid->addLayout( topBox, 0, 1 );
        topBox->addWidget( shoot );
        topBox->addStretch( 1 );

        angle->setValue( 60 );
        force->setValue( 25 );
        angle->setFocus();
    }

    int main( int argc, char **argv )
    {
        QApplication::setColorSpec( QApplication::CustomColor );
        QApplication a( argc, argv );

        MyWidget w;
        w.setGeometry( 100, 100, 500, 355 );
        a.setMainWidget( &w );
        w.show();
        return a.exec();
    }