QMyTextEdit : public QTextEdit

#ifndef QMYTEXTEDIT_H
#define QMYTEXTEDIT_H

#include <QTextEdit>

class QMyTextEdit : public QTextEdit
{
public:
    QMyTextEdit(QWidget *parent = 0);
    void contextMenuEvent(QContextMenuEvent *event);

};

#endif // QMYTEXTEDIT_H

#include "qmytextedit.h"
#include <QMenu>
#include <QContextMenuEvent>

QMyTextEdit::QMyTextEdit(QWidget *parent):QTextEdit(parent)
{
}

void QMyTextEdit::contextMenuEvent(QContextMenuEvent *event)
{
    QTextEdit *text= this;
    QMenu *menu = text->createStandardContextMenu();
    QAction *act = menu->addAction(tr("Clear"));
      connect(act,SIGNAL(triggered()),this,SLOT(clear()));
      menu->exec(event->globalPos());
      delete menu;
}