Qt rightclick QPushButton

I'm using Qt Creator to create a gui for a mineseeper game. How can I know a QpushButton clicked with rightclick? for flag in the game. In other word, which signal used for rightclick?

Create your own button with filter at mousePressEvent slot.

qrightclickbutton.h

#ifndef QRIGHTCLICKBUTTON_H
#define QRIGHTCLICKBUTTON_H

#include <QPushButton>
#include <QMouseEvent>

class QRightClickButton : public QPushButton
{
    Q_OBJECT

public:
    explicit QRightClickButton(QWidget *parent = 0);

private slots:
    void mousePressEvent(QMouseEvent *e);

signals:
    void rightClicked();

public slots:

};

#endif // QRIGHTCLICKBUTTON_H

qrightclickbutton.cpp

#include "qrightclickbutton.h"

QRightClickButton::QRightClickButton(QWidget *parent) :
    QPushButton(parent)
{
}

void QRightClickButton::mousePressEvent(QMouseEvent *e)
{
    if(e->button()==Qt::RightButton)
        emit rightClicked();
    mousePressEvent(QMouseEvent *e)
}

Now connect like this

QRightClickButton *button = new QRightClickButton(this);
ui->gridLayout->addWidget(button);
connect(button, SIGNAL(rightClicked()), this, SLOT(onRightClicked()));

Create a slot in MainWindow.cpp.

void MainWindow::onRightClicked()
{
    qDebug() << "User right clicked me";
}

It works for me!