How to see the source code of QGraphhicsItemAnimation Class

[ashukla]

$QTDIR\src\gui\graphicsview\qgraphicsitemanimation .cpp and also the header.

Regards

I am getting the QGraphicsItemAnimation.h in the following path. but I am not getting QGraphicsItemAnimation.cpp.
/usr/local/Trolltech/Qt-4.3.1/include/QtGui

I also use the find command to locate the corresponding .cpp file. but file does not exists.
Where I get this file.
regards!