def __init__(self, title=TITLE, level=WINDOW_TOPLEVEL, on_exit=None):
self.title = title
self.grabbing = False
self.events = []
self.rgb = WHITE_RGB
self.on_exit = on_exit
self.window = Window(level)
self.window.set_title(title)
self.window.set_resizable(True)
self.window.add_events(POINTER_MOTION_MASK)
self.window.set_default_size(350, 150)
self.colors = []
grab_btn = Button('Grab')
grab_btn.connect_object('clicked', self.toggle_grab, self.window)
self.grab_btn = grab_btn
exit_btn = Button('Exit')
exit_btn.connect_object('clicked', self.destroy, self.window)
drawing = DrawingArea()
drawing.connect_object('expose_event', self.do_expose, self.window)
self.drawing = drawing
label = Label(rgb_to_string(WHITE_RGB))
self.label = label
table = Table(2, 2, True)
table.attach(self.drawing, 0, 1, 0, 1)
table.attach(label, 0, 1, 1, 2)
table.attach(grab_btn, 1, 2, 0, 1)
table.attach(exit_btn, 1, 2, 1, 2)
self.window.add(table)
