#!/usr/bin/env python
def event_handler(e):
	code = e.get_code()
		   obj = e.get_target()
			 if code == lv.EVENT.VALUE_CHANGED:
				 if obj.has_state(lv.STATE.CHECKED):
						 print("State: on")
			 else:
							 print("State: off")


							 lv.scr_act().set_flex_flow(lv.FLEX_FLOW.COLUMN)
							 lv.scr_act().set_flex_align(lv.FLEX_ALIGN.CENTER, lv.FLEX_ALIGN.CENTER, lv.FLEX_ALIGN.CENTER)

							 sw = lv.switch(lv.scr_act())
								  sw.add_event_cb(event_handler, lv.EVENT.ALL, None)

								  sw = lv.switch(lv.scr_act())
									   sw.add_state(lv.STATE.CHECKED)
									   sw.add_event_cb(event_handler, lv.EVENT.ALL, None)

									   sw = lv.switch(lv.scr_act())
											sw.add_state(lv.STATE.DISABLED)
											sw.add_event_cb(event_handler, lv.EVENT.ALL, None)

											sw = lv.switch(lv.scr_act())
												 sw.add_state(lv.STATE.CHECKED | lv.STATE.DISABLED)
												 sw.add_event_cb(event_handler, lv.EVENT.ALL, None)

