'Inform the scene that the item (that the event was delivered to)
would accept a mouse click event if the user were to click before
moving the mouse again.
Returns True if the request is successful, otherwise returns False (indicating
that some other item would receive an incoming click).'

def acceptClicks(self, button):

    if (not self.acceptable):
        return False
    if (button not in self.__clickItems):
        self.__clickItems[button] = self.currentItem
        return True
    return False
