lib/python/Components/ServiceEventTracker.py

   1 class InfoBarBase:
   2         def __init__(self):
   3                 ServiceEventTracker.setActiveInfoBar(self)
   4                 self.onClose.append(self.__close)
   5
   6         def __close(self):
   7                 ServiceEventTracker.popActiveInfoBar()
   8
   9 class ServiceEventTracker:
  10         """Tracks service events into a screen"""
  11         InfoBarStack = [ ]
  12         InfoBarStackSize = 0
  13
  14         def __init__(self, screen, eventmap):
  15                 self.__eventmap = eventmap
  16                 self.screen = screen
  17                 screen.session.nav.event.append(self.__event)
  18                 screen.onClose.append(self.__del_event)
  19
  20         def __del_event(self):
  21                 self.screen.session.nav.event.remove(self.__event)
  22
  23         def __event(self, ev):
  24                 set = ServiceEventTracker
  25                 ssize = set.InfoBarStackSize
  26                 stack = set.InfoBarStack
  27                 if ev in self.__eventmap:
  28                         if not isinstance(self.screen, InfoBarBase) or (ssize and stack[ssize-1] == self.screen):
  29                                 self.__eventmap[ev]()
  30 #                       else:
  31 #                               print "ignore event", ev, "for inactive infobar '" + str(self.screen) + "'"
  32
  33         @staticmethod
  34         def setActiveInfoBar(infobar):
  35                 set = ServiceEventTracker
  36                 assert infobar not in set.InfoBarStack, "FATAL: Infobar '" + str(infobar) + "' is already active!"
  37                 set.InfoBarStack.append(infobar)
  38                 set.InfoBarStackSize += 1
  39 #               print "ServiceEventTracker set active '" + str(infobar) + "'"
  40
  41         @staticmethod
  42         def popActiveInfoBar():
  43                 set = ServiceEventTracker
  44                 stack = set.InfoBarStack
  45                 if set.InfoBarStackSize:
  46                         set.InfoBarStackSize -= 1
  47                         del stack[set.InfoBarStackSize]
  48 #                       if set.InfoBarStackSize:
  49 #                               print "ServiceEventTracker reset active '" + str(stack[set.InfoBarStackSize-1]) + "'"