lcd_manager_sample.py

import os
import datetime

class Display(object):
	def __init__(self):
		self.__messageIndex = 0
		self.__lighsOn = False
		self.__messages = []
		
	def AddMessage(self, text):
		self.AddMessageWith(text, None, False)

	def AddMessageWithDateExpired(self, text, dateExpired):
		self.AddMessageWith(text, dateExpired, False)

	def AddMessageWithHighPriority(self, text):
		self.AddMessageWith(text, None, True)

	def AddMessageWith(self, text, dateExpired, highPriority):
		message = Message(text, dateExpired, highPriority)
		self.__messages.append(message)

	def UpdateCurrent(self):
		self.Update(None)

	def Update(self, direction):
		os.system('cls' if os.name=='nt' else 'clear')
		self.RemoveExpired()

		if len(self.__messages) == 0:
			self.ShowDefault()
		else:
			self.UpdateLight()

			if direction is None:
				self.ShowMessage()
			elif direction == "next":
				self.ShowNext()
			elif direction == "prev":
				self.ShowPrevious()
			else:
				self.ShowNext()

	def DeleteCurrent(self):
		if self.__messageIndex < len(self.__messages):
			del self.__messages[self.__messageIndex]
			if self.__messageIndex > 0:
				self.__messageIndex = self.__messageIndex - 1

	def ShowPrevious(self):
		if self.__messageIndex == 0:
			self.__messageIndex = len(self.__messages) - 1
		else:
			self.__messageIndex = self.__messageIndex - 1

		self.ShowMessage()

	def ShowNext(self):
		self.__messageIndex = (self.__messageIndex + 1) % len(self.__messages)
		self.ShowMessage()

	def ShowMessage(self):
		message = self.__messages[self.__messageIndex]
		print str(self.__messageIndex + 1) + "/" + str(len(self.__messages))
		print message.DateCreated
		print message.Text

	def ShowDefault(self):
		print "Date&Time: " + str(datetime.datetime.now())

	def UpdateLight(self):
		i = 0

		tmpLighsOn = False

		if self.__lighsOn:
			tmpLighsOn = True
		else:
			while i < len(self.__messages):
				if self.__messages[i].HighPriority:
					tmpLighsOn = not tmpLighsOn
					break
				i += 1

		if tmpLighsOn:
			print "!!!!!"
		else:
			print "_____"

	def RemoveExpired(self):
		i = 0
		while i < len(self.__messages):
			if self.__messages[i].DateExpired is not None and self.__messages[i].DateExpired < datetime.datetime.now():
				del self.__messages[i]
				i = i - 1
			i += 1

class Message(object):
	def __init__(self, text, dateExpired, highPriority):
		self.Text = text
		self.DateExpired = dateExpired
		self.HighPriority = highPriority
		self.DateCreated = datetime.datetime.now()

i = 0
d = Display()
while 1 == 1 :
	input = raw_input()
	if input == "d":
		d.DeleteCurrent()
		d.Update("")
	elif input == "a":
		i = i + 10
		d.AddMessage(str(i))
		d.Update("")
	elif input == "h":
		i = i + 10
		d.AddMessageWithHighPriority("High " + str(i))
		d.Update("")
	elif input == "e":
		i = i + 10
		d.AddMessageWithDateExpired("Expired after 5 seconds", datetime.datetime.now() + datetime.timedelta(seconds=5))
		d.Update("")
	elif input == "x":
		i = i + 10
		d.AddMessageWith("High priority and Expired in ten seconds", datetime.datetime.now() + datetime.timedelta(seconds=10), True)
		d.Update("")
	elif input == "n":
		d.Update("next")
	elif input == "p":
		d.Update("prev")
	else:
		d.UpdateCurrent()