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...
protected:

    bool eventFilter(QObject * obj, QEvent *event);
...

ui->centralWidget->installEventFilter(this);

bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
    if ((event->type() == QEvent::MouseButtonPress))
    {
        QMessageBox mes;
        mes.setText(obj->objectName());
        mes.exec();
    }
}

ui->QTableView_obj->installEventFilter(this);

return false;

return true;

return false;

bool QApplication::notify(QObject *obj, QEvent *event)
{
    return false;
}

bool QApplication::notify(QObject *obj, QEvent *event)
{
    return false;
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
...
qApp->installEventFilter(this);
....
}
bool MainWindow::eventFilter(QObject *obj, QEvent *event)
{
    if ((event->type() == QEvent::MouseButtonPress)&&(obj == ui->Mnemo)&&(FixFlag))
    {
        ....
    }
    return false;
}

bool QApplication::notify(QObject *obj, QEvent *event)
{
    if ((event->type() == QEvent::MouseButtonPress))
    {
        QMessageBox mes;
        mes.setText(obj->objectName());
        mes.exec();
    }
    return false;
}

QMouseEvent* myEvent = qobject_cast<QMouseEvent*>(event);
QPoint position = myEvent->pos();

QMouseEvent * ev = qobject_cast <QMouseEvent *>(event);

Example:

 QObject *obj = new QTimer;          // QTimer inherits QObject

 QTimer *timer = qobject_cast<QTimer *>(obj);
 // timer == (QObject *)obj

 QAbstractButton *button = qobject_cast<QAbstractButton *>(obj);
 // button == 0