MainWindow.h

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// ======================================================================
//  MainWindow.h
// ======================================================================
//                   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
// ======================================================================

#pragma once

#include <QtWidgets>

// ======================================================================
class MainWindow : public QMainWindow {
Q_OBJECT
private:
    QLabel* m_plblX;
    QLabel* m_plblY;

protected:
    virtual void mouseMoveEvent(QMouseEvent* pe)
    {
        m_plblX->setText("X=" + QString().setNum(pe->x()));
        m_plblY->setText("Y=" + QString().setNum(pe->y()));
    }

public:
    MainWindow(QWidget* pwgt = 0) : QMainWindow(pwgt) 
    {
       setMouseTracking(true);

       m_plblX = new QLabel(this);
       m_plblY = new QLabel(this);
       statusBar()->addWidget(m_plblY);
       statusBar()->addWidget(m_plblX);       
    }
};