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
  19         def __init__(self, screen, eventmap):
  20                 self.__eventmap = eventmap
  21                 self.screen = screen
  22                 screen.session.nav.event.append(self.__event)
  23                 screen.onClose.append(self.__del_event)
  24
  25         def __del_event(self):
  26                 self.screen.session.nav.event.remove(self.__event)
  27
  28         def __event(self, ev):
  29                 set = ServiceEventTracker
  30                 screen = self.screen
  31                 nav = screen.session.nav
  32                 cur_ref = nav.getCurrentlyPlayingServiceReference()
  33                 old_service_running = set.oldRef and cur_ref and cur_ref == set.oldRef and set.oldService and set.oldService == str(nav.getCurrentService())
  34                 if not old_service_running:
  35                         set.oldService = None
  36                         set.oldRef = None
  37 #               print "old_service_running", old_service_running
  38                 if ev in self.__eventmap:
  39                         ssize = set.InfoBarStackSize
  40                         stack = set.InfoBarStack
  41                         if (not isinstance(screen, InfoBarBase) or # let pass all events to screens not derived from InfoBarBase
  42                                 (not old_service_running and ssize and stack[ssize-1] == screen) or # let pass events from currently running service just to current active screen (derived from InfoBarBase)
  43                                 (old_service_running and ssize > 1 and stack[ssize-2] == screen)): # let pass events from old running service just to previous active screen (derived from InfoBarBase)
  44                                 self.__eventmap[ev]()
  45 #                       else:
  46 #                               print "ignore event", ev, "for inactive infobar '" + str(self.screen) + "'"
  47
  48         @staticmethod
  49         def setActiveInfoBar(infobar, old_service, old_ref):
  50                 set = ServiceEventTracker
  51                 set.oldRef = old_ref
  52                 set.oldService = old_service and str(old_service)
  53                 assert infobar not in set.InfoBarStack, "FATAL: Infobar '" + str(infobar) + "' is already active!"
  54                 set.InfoBarStack.append(infobar)
  55                 set.InfoBarStackSize += 1
  56 #               print "ServiceEventTracker set active '" + str(infobar) + "'"
  57
  58         @staticmethod
  59         def popActiveInfoBar():
  60                 set = ServiceEventTracker
  61                 stack = set.InfoBarStack
  62                 if set.InfoBarStackSize:
  63                         set.InfoBarStackSize -= 1
  64                         del stack[set.InfoBarStackSize]
  65 #                       if set.InfoBarStackSize:
  66 #                               print "ServiceEventTracker reset active '" + str(stack[set.InfoBarStackSize-1]) + "'"