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 Window : public QLabel {
private:
    QPoint m_ptPosition;

protected:
    virtual void mousePressEvent(QMouseEvent* pe)
    {
        m_ptPosition = pe->pos();
    }

    virtual void mouseMoveEvent(QMouseEvent* pe)
    {
        move(pe->globalPos() - m_ptPosition);
    }

public:
    Window(QWidget* pwgt = 0) 
        : QLabel(pwgt,  Qt::FramelessWindowHint | Qt::Window) 
    {
    }
};

// ----------------------------------------------------------------------
int main(int argc, char** argv)
{
    QApplication app(argc, argv);
    Window       wnd;
  
    wnd.setAttribute(Qt::WA_TranslucentBackground);
    wnd.setPixmap(QPixmap(":/happyos.png"));

    QPushButton* pcmdQuit = new QPushButton("X");
    pcmdQuit->setFixedSize(16, 16);
    QObject::connect(pcmdQuit, SIGNAL(clicked()), &app, SLOT(quit()));

    //setup layout
    QVBoxLayout* pvbx = new QVBoxLayout;
    pvbx->addWidget(pcmdQuit);
    pvbx->addStretch(1);
    wnd.setLayout(pvbx);

    wnd.show();    

    return app.exec();
}