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         oldServiceStr = 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.oldServiceStr == nav.getCurrentService().getPtrString()
  29                         if not old_service_running and set.oldServiceStr:
  30                                 set.oldServiceStr = None
  31                                 set.oldRef = None
  32                         ssize = set.InfoBarStackSize
  33                         stack = set.InfoBarStack
  34                         for func in func_list:
  35                                 if (func[0] or  # let pass all events to screens not derived from InfoBarBase
  36                                         (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)
  37                                         (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)
  38                                         func[2]()
  39
  40         @staticmethod
  41         def setActiveInfoBar(infobar, old_service, old_ref):
  42                 set = ServiceEventTracker
  43                 set.oldRef = old_ref
  44                 set.oldServiceStr = old_service and old_service.getPtrString()
  45                 assert infobar not in set.InfoBarStack, "FATAL: Infobar '" + str(infobar) + "' is already active!"
  46                 set.InfoBarStack.append(infobar)
  47                 set.InfoBarStackSize += 1
  48 #               print "ServiceEventTracker set active '" + str(infobar) + "'"
  49
  50         @staticmethod
  51         def popActiveInfoBar():
  52                 set = ServiceEventTracker
  53                 stack = set.InfoBarStack
  54                 if set.InfoBarStackSize:
  55                         nav = set.navcore
  56                         set.InfoBarStackSize -= 1
  57                         del stack[set.InfoBarStackSize]
  58                         old_service = nav.getCurrentService()
  59                         set.oldServiceStr = old_service and old_service.getPtrString()
  60                         set.oldRef = nav.getCurrentlyPlayingServiceReference()
  61 #                       if set.InfoBarStackSize:
  62 #                               print "ServiceEventTracker reset active '" + str(stack[set.InfoBarStackSize-1]) + "'"
  63
  64         def __init__(self, screen, eventmap):
  65                 self.__screen = screen
  66                 self.__eventmap = eventmap
  67                 self.__passall = not isinstance(screen, InfoBarBase) # let pass all events to screens not derived from InfoBarBase
  68                 EventMap = ServiceEventTracker.EventMap
  69                 if not len(EventMap):
  70                         screen.session.nav.event.append(ServiceEventTracker.event)
  71                         ServiceEventTracker.navcore = screen.session.nav
  72                 EventMap = EventMap.setdefault
  73                 for x in eventmap.iteritems():
  74                         EventMap(x[0], []).append((self.__passall, screen, x[1]))
  75                 screen.onClose.append(self.__del_event)
  76
  77         def __del_event(self):
  78                 EventMap = ServiceEventTracker.EventMap.setdefault
  79                 for x in self.__eventmap.iteritems():
  80                         EventMap(x[0], []).remove((self.__passall, self.__screen, x[1]))