'x, y in figure coords, 0,0 = bottom, left
button pressed None, 1, 2, 3, \'up\', \'down\''

def __init__(self, name, canvas, x, y, button=None, key=None, step=0, dblclick=False, guiEvent=None):

    LocationEvent.__init__(self, name, canvas, x, y, guiEvent=guiEvent)
    self.button = button
    self.key = key
    self.step = step
    self.dblclick = dblclick
