Invoke copy paste for QgraphicsTextItem - qt

Question

How can the cut, copy paste slots be invoked for QgraphicsTextItem. Though the the text editor has default slots for cut, copy and paste, but I don't know how to invoke them.
I have class that is inherited from QgraphicsTextItem. The use of this class is to add a text in GraphicsView. Now I want the cut, paste and copy functality for it. How can I go for that?
drawText.h
#include <QGraphicsTextItem>
#include <QPen>
QT_BEGIN_NAMESPACE
class QFocusEvent;
class QGraphicsItem;
class QGraphicsScene;
class QGraphicsSceneMouseEvent;
QT_END_NAMESPACE
class mText : public QGraphicsTextItem
{
Q_OBJECT
public:
mText( int, QGraphicsItem *parent=0 );
enum { Type = UserType + 5 };
int type() const;
int id;
signals:
void lostFocus(mText *item);
void selectedChange(QGraphicsItem *item);
protected:
QVariant itemChange(GraphicsItemChange change, const QVariant &value);
void focusOutEvent(QFocusEvent *event);
void mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event);
};
.cpp
#include "mtext.h"
mText::mText( int i, QGraphicsItem *parent)
: QGraphicsTextItem(parent )
{
//assigns id
id = i;
}
int mText::type() const
{
// Enable the use of qgraphicsitem_cast with text item.
return Type;
}
QVariant mText::itemChange(GraphicsItemChange change,
const QVariant &value)
{
if (change == QGraphicsItem::ItemSelectedHasChanged)
emit selectedChange(this);
return value;
}
void mText::focusOutEvent(QFocusEvent *event)
{
setTextInteractionFlags(Qt::NoTextInteraction);
emit lostFocus(this);
QGraphicsTextItem::focusOutEvent(event);
}
void mText::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
{
if (textInteractionFlags() == Qt::NoTextInteraction)
setTextInteractionFlags(Qt::TextEditorInteraction);
QGraphicsTextItem::mouseDoubleClickEvent(event);
}