This method should be called every time through the main loop.

        It handles all of the dragging

        Parameters:
            | eventObj - the event object obtained by calling pygame.event.get()

        Returns:
            | False most of the time
            | True when the user finishes dragging by lifting up on the mouse.

def handleEvent(self, eventObj):
        """This method should be called every time through the main loop.

        It handles all of the dragging

        Parameters:
            | eventObj - the event object obtained by calling pygame.event.get()

        Returns:
            | False most of the time
            | True when the user finishes dragging by lifting up on the mouse.

        """
        if not self.isEnabled:
            return False

        if eventObj.type not in (MOUSEMOTION, MOUSEBUTTONUP, MOUSEBUTTONDOWN) :
            # The dragger only cares about mouse-related events
            return False

        clicked = False
        if eventObj.type == MOUSEBUTTONDOWN:
            if self.rect.collidepoint(eventObj.pos):
                self.dragging = True
                self.deltaX = eventObj.pos[0] - self.rect.left
                self.deltaY = eventObj.pos[1] - self.rect.top
                self.startDraggingX = self.rect.left
                self.startDraggingY = self.rect.top

        elif eventObj.type == MOUSEBUTTONUP:
            if self.dragging:
                self.dragging = False
                clicked = True
                self.mouseUpLoc = (eventObj.pos[0], eventObj.pos[1])
                self.rect.left = eventObj.pos[0] - self.deltaX
                self.rect.top = eventObj.pos[1] - self.deltaY
                self.setLoc((self.rect.left, self.rect.top))


        elif eventObj.type == MOUSEMOTION:
            if self.dragging:
                self.rect.left = eventObj.pos[0] - self.deltaX
                self.rect.top = eventObj.pos[1] - self.deltaY
            else:
                self.mouseOver = self.rect.collidepoint(eventObj.pos)

        if clicked:
            if self.callBack is not None:
                self.callBack(self.nickname)

        return clicked