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;

    QPushButton* pcmdA = new QPushButton("A");
    QPushButton* pcmdB = new QPushButton("B");
    QPushButton* pcmdC = new QPushButton("C");
    QPushButton* pcmdD = new QPushButton("D");
                                                   
    QVBoxLayout* pvbxLayout = new QVBoxLayout;
    QHBoxLayout* phbxLayout = new QHBoxLayout;
    phbxLayout->setContentsMargins(5, 5, 5, 5);
    phbxLayout->setSpacing(15);
    phbxLayout->addWidget(pcmdC);
    phbxLayout->addWidget(pcmdD);

    pvbxLayout->setMargin(5);
    pvbxLayout->setSpacing(15);    
    pvbxLayout->addWidget(pcmdA);
    pvbxLayout->addWidget(pcmdB);
    pvbxLayout->addLayout(phbxLayout);    
    wgt.setLayout(pvbxLayout);

    wgt.show(); 

    return app.exec();
}