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main.cpp Example File
pinpad/main.cpp

 #include <QApplication>
 #include <QwwNumPad>
 #include <QLineEdit>
 #include <QLayout>

 class Widget : public QWidget {
     Q_OBJECT
 public:
     Widget() : QWidget(){
         QwwNumPad *pad = new QwwNumPad;
         lineEdit = new QLineEdit;
         lineEdit->setReadOnly(true);
         lineEdit->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Fixed);
         connect(pad, SIGNAL(numberClicked(int)), this, SLOT(handleClick(int)));
         connect(pad, SIGNAL(hashClicked()), lineEdit, SLOT(clear()));
         QVBoxLayout *l = new QVBoxLayout(this);
         l->addWidget(lineEdit);
         l->addWidget(pad);
         l->setSizeConstraint(QLayout::SetFixedSize);
     }
 private:
     QLineEdit *lineEdit;
 private slots:
     void handleClick(int val){
         lineEdit->setText(lineEdit->text()+QString::number(val));
     }
 };

 #include "main.moc"

 int main(int argc, char **argv){
     QApplication app(argc, argv);
     Widget w;
     w.show();
     return app.exec();
 }