what is way to catch touch event on QScroller::LeftMouseButtonGesture ?

[Qt embedded developer]

i have seen that i can catch below event on left mouse button click but i want to update it
for catch swipe event inside scroller area like in how we scroll image mobile to see list of image. i have used QScroller::LeftMouseButtonGesture.

what extra thing i need to do to achieve that event.

void FileManager::mouseReleaseEvent(QMouseEvent *me)
{
    qDebug()<< "Gesture"<<me->type();

    if( me->type() == QEvent::MouseButtonRelease)
    {
        if(Imagecount>0)
        {
            if( u8RowIndex < MaxPossibleRow)
            {
                    qDebug()<< "Gesture"<<me->type();
                    DisplayImageList();
            }
        }
    }
}