old_contents: import goocanvas
  
  from frame.PanelWindow import PanelWindow
  from sugar.canvas.IconItem import IconItem
  from sugar.canvas.IconColor import IconColor
  from sugar.canvas.GridLayout import GridGroup
  from sugar.canvas.GridLayout import GridConstraints
  from sugar.presence import PresenceService
  
  class RightPanel(GridGroup):
  	def __init__(self, shell, friends):
  		GridGroup.__init__(self, 1, 10)
  		self._shell = shell
  		self._friends = friends
  		self._activity_ps = None
  		self._joined_hid = -1
  		self._left_hid = -1
  
  		self._pservice = PresenceService.get_instance()
  		self._pservice.connect('activity-appeared',
  							   self.__activity_appeared_cb)
  
  		shell.connect('activity-changed', self.__activity_changed_cb)
  
  	def add(self, buddy):
  		icon = IconItem(icon_name='stock-buddy',
  				        color=IconColor(buddy.get_color()))
  		icon.connect('clicked', self.__buddy_clicked_cb, buddy)
  
  		row = self.get_n_children()
  		constraints = GridConstraints(0, row , 1, 1, 6)
  		self._layout.set_constraints(icon, constraints)
  
  		self.add_child(icon)
  
  	def remove(self, buddy):
  		pass
  
  	def clear(self):
  		pass
  
  	def __activity_appeared_cb(self, pservice, activity_ps):
  		activity = self._shell.get_current_activity()
  		if activity_ps.get_id() == activity.get_id():
  			self._set_activity_ps(activity_ps)
  
  	def _set_activity_ps(self, activity_ps):
  		if self._activity_ps == activity_ps:
  			return
  
  		if self._joined_hid > 0:
  			self._activity_ps.disconnect(self._joined_hid)
  			self._joined_hid = -1
  		if self._left_hid > 0:
  			self._activity_ps.disconnect(self._left_hid)
  			self._left_hid = -1
  
  		self._activity_ps = activity_ps
  
  		self.clear()
  
  		if activity_ps != None:
  			for buddy in activity_ps.get_joined_buddies():
  				self.add(buddy)
  
  			self._joined_hid = activity_ps.connect(
  							'buddy-joined', self.__buddy_joined_cb)
  			self._left_hid = activity_ps.connect(
  							'buddy-left', self.__buddy_left_cb)
  
  	def __activity_changed_cb(self, group, activity):
  		activity_ps = self._pservice.get_activity(activity.get_id())
  		self._set_activity_ps(activity_ps)				
  
  	def __buddy_joined_cb(self, activity, buddy):
  		self.add(buddy)
  
  	def __buddy_left_cb(self, activity, buddy):
  		self.remove(buddy)
  
  	def __buddy_clicked_cb(self, icon, buddy):
  		self._friends.add_buddy(buddy)
  
new_contents: import goocanvas
  
  from frame.PanelWindow import PanelWindow
  from sugar.canvas.IconItem import IconItem
  from sugar.canvas.IconColor import IconColor
  from sugar.canvas.GridLayout import GridGroup
  from sugar.canvas.GridLayout import GridConstraints
  from sugar.presence import PresenceService
  
  class RightPanel(GridGroup):
  	def __init__(self, shell, friends):
  		GridGroup.__init__(self, 1, 10)
  		self._shell = shell
  		self._friends = friends
  		self._activity_ps = None
  		self._joined_hid = -1
  		self._left_hid = -1
  
  		self._pservice = PresenceService.get_instance()
  		self._pservice.connect('activity-appeared',
  							   self.__activity_appeared_cb)
  
  		shell.connect('activity-changed', self.__activity_changed_cb)
  
  	def add(self, buddy):
  		icon = IconItem(icon_name='stock-buddy',
  				        color=IconColor(buddy.get_color()))
  		icon.connect('clicked', self.__buddy_clicked_cb, buddy)
  
  		row = self.get_n_children()
  		constraints = GridConstraints(0, row , 1, 1, 6)
  		self._layout.set_constraints(icon, constraints)
  
  		self.add_child(icon)
  
  	def remove(self, buddy):
  		pass
  
  	def clear(self):
  		while (self.get_n_children() > 0):
  			self.remove_child(0)
  
  	def __activity_appeared_cb(self, pservice, activity_ps):
  		activity = self._shell.get_current_activity()
  		if activity_ps.get_id() == activity.get_id():
  			self._set_activity_ps(activity_ps)
  
  	def _set_activity_ps(self, activity_ps):
  		if self._activity_ps == activity_ps:
  			return
  
  		if self._joined_hid > 0:
  			self._activity_ps.disconnect(self._joined_hid)
  			self._joined_hid = -1
  		if self._left_hid > 0:
  			self._activity_ps.disconnect(self._left_hid)
  			self._left_hid = -1
  
  		self._activity_ps = activity_ps
  
  		self.clear()
  
  		if activity_ps != None:
  			for buddy in activity_ps.get_joined_buddies():
  				self.add(buddy)
  
  			self._joined_hid = activity_ps.connect(
  							'buddy-joined', self.__buddy_joined_cb)
  			self._left_hid = activity_ps.connect(
  							'buddy-left', self.__buddy_left_cb)
  
  	def __activity_changed_cb(self, group, activity):
  		activity_ps = self._pservice.get_activity(activity.get_id())
  		self._set_activity_ps(activity_ps)				
  
  	def __buddy_joined_cb(self, activity, buddy):
  		self.add(buddy)
  
  	def __buddy_left_cb(self, activity, buddy):
  		self.remove(buddy)
  
  	def __buddy_clicked_cb(self, icon, buddy):
  		self._friends.add_buddy(buddy)
  
subject: Implement clear