main.cpp

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// ======================================================================
//  main.cpp
// ======================================================================
//                   This file is a part of the book 
//             "Qt 5.10 Professional programming with C++"
//                       http://qt-book.com
// ======================================================================
//  Copyright (c) 2017 by Max Schlee
// ======================================================================

#include <QtWidgets>

// ----------------------------------------------------------------------
int main (int argc, char** argv)
{
    QApplication app(argc, argv);
    QWidget      wgt;

    QLabel* plblDisplay = new QLabel;
    plblDisplay->setFrameStyle(QFrame::Box | QFrame::Raised);
    plblDisplay->setLineWidth(2);
    plblDisplay->setFixedHeight(50);

    QLabel*    plblText = new QLabel("&Text:");
    QLineEdit* ptxt     = new QLineEdit;
    plblText->setBuddy(ptxt);
    QObject::connect(ptxt, SIGNAL(textChanged(const QString&)),
                     plblDisplay, SLOT(setText(const QString&))
                    );


    QLabel*    plblPassword = new QLabel("&Password:");
    QLineEdit* ptxtPassword = new QLineEdit;
    plblPassword->setBuddy(ptxtPassword);
    ptxtPassword->setEchoMode(QLineEdit::Password);
    QObject::connect(ptxtPassword, SIGNAL(textChanged(const QString&)),
                     plblDisplay, SLOT(setText(const QString&))
                    );

    //Layout setup
    QVBoxLayout* pvbxLayout = new QVBoxLayout;    
    pvbxLayout->addWidget(plblDisplay);
    pvbxLayout->addWidget(plblText);
    pvbxLayout->addWidget(ptxt);
    pvbxLayout->addWidget(plblPassword);
    pvbxLayout->addWidget(ptxtPassword);
    wgt.setLayout(pvbxLayout);

    wgt.show();

    return app.exec();
}