lib/python/Components/Sources/Boolean.py

   1 from Source import Source
   2 from Components.Element import cached
   3 from enigma import eTimer
   4
   5 # a small warning:
   6 # you can use that boolean well to express screen-private
   7 # conditional expressions.
   8 #
   9 # however, if you think that there is ANY interest that another
  10 # screen could use your expression, please put your calculation
  11 # into a seperate Source, providing a "boolean"-property.
  12 class Boolean(Source, object):
  13         def __init__(self, fixed = False, function = None, poll = 0):
  14                 Source.__init__(self)
  15                 self.function = function
  16                 self.fixed = fixed
  17                 if poll > 0:
  18                         self.poll_timer = eTimer()
  19                         self.poll_timer.timeout.get().append(self.poll)
  20                         self.poll_timer.start(poll)
  21
  22         @cached
  23         def getBoolean(self):
  24                 if self.function is not None:
  25                         return self.function()
  26                 else:
  27                         return self.fixed
  28
  29         boolean = property(getBoolean)
  30
  31         def poll(self):
  32                 self.changed((self.CHANGED_ALL,))