lib/python/Components/ServiceEventTracker.py

   1 class InfoBarBase:
   2         def __init__(self, steal_current_service = False):
   3                 if steal_current_service:
   4                         ServiceEventTracker.setActiveInfoBar(self, None, None)
   5                 else:
   6                         nav = self.session.nav
   7                         ServiceEventTracker.setActiveInfoBar(self, not steal_current_service and nav.getCurrentService(), nav.getCurrentlyPlayingServiceReference())
   8                 self.onClose.append(self.__close)
   9
  10         def __close(self):
  11                 ServiceEventTracker.popActiveInfoBar()
  12
  13 class ServiceEventTracker:
  14         """Tracks service events into a screen"""
  15         InfoBarStack = [ ]
  16         InfoBarStackSize = 0
  17         oldService = None
  18         EventMap = { }
  19         navcore = None
  20
  21         @staticmethod
  22         def event(evt):
  23                 set = ServiceEventTracker
  24                 func_list = set.EventMap.setdefault(evt, [])
  25                 if func_list:
  26                         nav = set.navcore
  27                         cur_ref = nav.getCurrentlyPlayingServiceReference()
  28                         old_service_running = set.oldRef and cur_ref and cur_ref == set.oldRef and set.oldService and set.oldService == str(nav.getCurrentService())
  29 #                       print "old_service_running", old_service_running
  30                         if not old_service_running and set.oldService:
  31                                 set.oldService = None
  32                                 set.oldRef = None
  33                         ssize = set.InfoBarStackSize
  34                         stack = set.InfoBarStack
  35                         for func in func_list:
  36                                 if (func[0] or  # let pass all events to screens not derived from InfoBarBase
  37                                         (not old_service_running and stack[ssize-1] == func[1]) or # let pass events from currently running service just to current active screen (derived from InfoBarBase)
  38                                         (old_service_running and ssize > 1 and stack[ssize-2] == func[1])): # let pass events from old running service just to previous active screen (derived from InfoBarBase)
  39                                         func[2]()
  40 #                               else:
  41 #                                       print "ignore event", ev, "for inactive infobar '" + str(self.screen) + "'"
  42
  43         @staticmethod
  44         def setActiveInfoBar(infobar, old_service, old_ref):
  45                 set = ServiceEventTracker
  46                 set.oldRef = old_ref
  47                 set.oldService = old_service and str(old_service)
  48                 assert infobar not in set.InfoBarStack, "FATAL: Infobar '" + str(infobar) + "' is already active!"
  49                 set.InfoBarStack.append(infobar)
  50                 set.InfoBarStackSize += 1
  51 #               print "ServiceEventTracker set active '" + str(infobar) + "'"
  52
  53         @staticmethod
  54         def popActiveInfoBar():
  55                 set = ServiceEventTracker
  56                 stack = set.InfoBarStack
  57                 if set.InfoBarStackSize:
  58                         set.InfoBarStackSize -= 1
  59                         del stack[set.InfoBarStackSize]
  60 #                       if set.InfoBarStackSize:
  61 #                               print "ServiceEventTracker reset active '" + str(stack[set.InfoBarStackSize-1]) + "'"
  62
  63         def __init__(self, screen, eventmap):
  64                 self.__screen = screen
  65                 self.__eventmap = eventmap
  66                 self.__passall = not isinstance(screen, InfoBarBase) # let pass all events to screens not derived from InfoBarBase
  67                 EventMap = ServiceEventTracker.EventMap
  68                 if not len(EventMap):
  69                         screen.session.nav.event.append(ServiceEventTracker.event)
  70                         ServiceEventTracker.navcore = screen.session.nav
  71                 EventMap = EventMap.setdefault
  72                 for x in eventmap.iteritems():
  73                         EventMap(x[0], []).append((self.__passall, screen, x[1]))
  74                 screen.onClose.append(self.__del_event)
  75
  76         def __del_event(self):
  77                 EventMap = ServiceEventTracker.EventMap.setdefault
  78                 for x in self.__eventmap.iteritems():
  79                         EventMap(x[0], []).remove((self.__passall, self.__screen, x[1]))