def __init__( self ): # display_screens is a dictionary with the types of screens # this is the first one to display self.screens = Screens() self.active_screen = 0 # this is current screen in the list to display self.screens_to_display = [] # if no screens selected then dont display anything self.idle_counter = 0 self.screensaver_selected = False
class Display: # This is the overall class capturing the various displays that could be used def __init__( self ): # display_screens is a dictionary with the types of screens # this is the first one to display self.screens = Screens() self.active_screen = 0 # this is current screen in the list to display self.screens_to_display = [] # if no screens selected then dont display anything self.idle_counter = 0 self.screensaver_selected = False def update( self, next ): # Control logic for which screen to display # Either update each screen moving on to the next one when told to move to the next, # or display the startup, screensaver or exit screens as appropriate if next: self.next_screen() if self.idle_counter < IDLE_PERIOD: if self.screens.update( self.screens_to_display[ self.active_screen ] ): # ie the system is idle_counter self.idle_counter += 1 elif self.screensaver_selected: idle = self.screens.update( 'screensaver' ) # ie system is no longer idle if not idle: self.idle_counter = 0 else: if self.screens.update( self.screens_to_display[ self.active_screen ] ): # ie the system is idle_counter self.idle_counter += 1 else: self.idle_counter = 0 #print self.idle_counter def select( self, user_selection ): #create a list of the screens to display based on ones available and selected by the user #user selection is a list of screen shortcuts #print "user entered " + str( user_selection ) self.active_screen = 0 self.screens_to_display = [] for selection in user_selection: if selection in self.screens.shortcuts().values(): for s, shortcut in self.screens.shortcuts().items(): if selection == shortcut and self.screens.availability()[ s ] != NOT_AVAILABLE: if s == 'screensaver': self.screensaver_selected = True else: self.screens_to_display.append( s ) elif selection == shortcut and self.screens.availability()[ s ] == NOT_AVAILABLE: print "Selected screen %s, <%s> is not available" % (s, shortcut) else: print "Screen selection <%s> is not recognised" % selection def available(self): return self.screens.availability() def shortcuts(self): return self.screens.shortcuts() def startup( self ): self.screens.update( 'init' ) def shutdown( self ): self.screens.update( 'exit' ) def screen_type( self ): return( self.screens.display_type()) def help_text( self ): help = '\nDisplay type: ' + self.screens.display_type() + '\nScreens available:' for s, a in self.available.items(): if a != NOT_AVAILABLE: help += '\n <%s> %s screen: %s ' % ( self.screens.shortcuts()[ s ], s, a) return( help ) def next_screen( self ): # an algorithm to go to the next screen self.active_screen = self.active_screen + 1 if self.active_screen == len( self.screens_to_display ): self.active_screen = 0
