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class InfoBarBase:
def __init__(self, steal_current_service = False):
if steal_current_service:
ServiceEventTracker.setActiveInfoBar(self, None, None)
else:
nav = self.session.nav
ServiceEventTracker.setActiveInfoBar(self, not steal_current_service and nav.getCurrentService(), nav.getCurrentlyPlayingServiceReference())
self.onClose.append(self.__close)
def __close(self):
ServiceEventTracker.popActiveInfoBar()
class ServiceEventTracker:
"""Tracks service events into a screen"""
InfoBarStack = [ ]
InfoBarStackSize = 0
oldService = None
def __init__(self, screen, eventmap):
self.__eventmap = eventmap
self.screen = screen
screen.session.nav.event.append(self.__event)
screen.onClose.append(self.__del_event)
def __del_event(self):
self.screen.session.nav.event.remove(self.__event)
def __event(self, ev):
set = ServiceEventTracker
screen = self.screen
nav = screen.session.nav
cur_ref = nav.getCurrentlyPlayingServiceReference()
old_service_running = set.oldRef and cur_ref and cur_ref == set.oldRef and set.oldService and set.oldService == str(nav.getCurrentService())
if not old_service_running:
set.oldService = None
set.oldRef = None
# print "old_service_running", old_service_running
if ev in self.__eventmap:
ssize = set.InfoBarStackSize
stack = set.InfoBarStack
if (not isinstance(screen, InfoBarBase) or # let pass all events to screens not derived from InfoBarBase
(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)
(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)
self.__eventmap[ev]()
# else:
# print "ignore event", ev, "for inactive infobar '" + str(self.screen) + "'"
@staticmethod
def setActiveInfoBar(infobar, old_service, old_ref):
set = ServiceEventTracker
set.oldRef = old_ref
set.oldService = old_service and str(old_service)
assert infobar not in set.InfoBarStack, "FATAL: Infobar '" + str(infobar) + "' is already active!"
set.InfoBarStack.append(infobar)
set.InfoBarStackSize += 1
# print "ServiceEventTracker set active '" + str(infobar) + "'"
@staticmethod
def popActiveInfoBar():
set = ServiceEventTracker
stack = set.InfoBarStack
if set.InfoBarStackSize:
set.InfoBarStackSize -= 1
del stack[set.InfoBarStackSize]
# if set.InfoBarStackSize:
# print "ServiceEventTracker reset active '" + str(stack[set.InfoBarStackSize-1]) + "'"
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