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>

// ======================================================================
class ResizeObserver : public QLabel {
public:
    ResizeObserver(QWidget* pwgt = 0) : QLabel(pwgt)
    {
        setAlignment(Qt::AlignCenter);
    }

protected:
    virtual void resizeEvent(QResizeEvent* pe)
    {
        setText(QString("Resized")
                + "\n width()=" + QString::number(pe->size().width())
                + "\n height()=" + QString::number(pe->size().height())
               );
    }
};

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

    wgt.resize(250, 130);
    wgt.show();

    return app.exec();
}