Qt tutorial - t7/main.cpp

# Source code for tutorial 7: main.cpp

    /****************************************************************
    **
    ** Qt tutorial 7
    **
    ****************************************************************/

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

    #include "lcdrange.h"

    class MyWidget : public QWidget
    {
    public:
        MyWidget( QWidget *parent=0, const char *name=0 );
    protected:
        void resizeEvent( QResizeEvent * );
    private:
        QPushButton *quit;
        LCDRange *value[16];
    };

    MyWidget::MyWidget( QWidget *parent, const char *name )
            : QWidget( parent, name )
    {
        setMinimumSize( 200, 300 );

        quit = new QPushButton( "Quit", this, "quit" );
        quit->setGeometry( 10, 10, 75, 30 );
        quit->setFont( QFont( "Times", 18, QFont::Bold ) );
        connect( quit, SIGNAL(clicked()), qApp, SLOT(quit()) );

        for( int i = 0 ; i < 16 ; i++ ) {
            value[i] = new LCDRange( this );
            if ( i > 0 )
                connect( value[i], SIGNAL(valueChanged(int)),
                         value[i - 1], SLOT(setValue(int)) );
        }
    }

    void MyWidget::resizeEvent( QResizeEvent * )
    {
        int valueWidth = (width() - 20)/4;
        int valueHeight = (height() - 65)/4;
        for( int i = 0 ; i < 16 ; i++ )
            value[i]->setGeometry( 10 + (i%4)*valueWidth,  55 + (i/4)*valueHeight,
                                   valueWidth - 5, valueHeight - 5 );
    }

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

        MyWidget w;
        w.setGeometry( 100, 100, 400, 400 );
        a.setMainWidget( &w );
        w.show();
        return a.exec();
    }