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#include <qapplication.h>
#include <qfont.h>
#include <qpushbutton.h>
#include <qwidget.h>
#include <qobject.h>
#include <qlineedit.h>

using namespace std;

class MyWidget : public QWidget
{

Q_OBJECT

public:
        MyWidget(void);
public slots:
        void enable(void);
protected:
        QLineEdit *lineEdit;
        QPushButton *nextButton;
};

MyWidget::MyWidget(void)
{

     setGeometry(25, 25, 250, 120);
     setCaption("Test");
     setName("MainWindow");

     QPushButton *nextButton = new QPushButton( "Next", this, "Button" );
     nextButton->setFont(QFont("Sans", 10, QFont::Normal));
     nextButton->setGeometry(120, 80, 90, 30);
     nextButton->setEnabled(0);

     QLineEdit *lineEdit = new QLineEdit( this, "lineEdit" );
     lineEdit->setGeometry(20,20,200,40);
     QObject::connect(lineEdit, SIGNAL(returnPressed()), this, SLOT(enable()));
}

void MyWidget::enable() {
        nextButton->setEnabled(1);
}


int main(int argc, char *argv[]) {
     QApplication app( argc, argv );
     MyWidget window;
     app.setMainWidget( &window );
     window.show();
     return app.exec();

}

#include "window.moc"