services/presence/: Make Activities responsible for tracking their members.

Add a signal to notify the PS when all members have gone away.

services/presence/activity.py

@@ -48,8 +48,17 @@ class Activity(ExportedGObject):
     __gtype_name__ = "Activity"
 
     __gsignals__ = {
-        'validity-changed': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
-                            ([gobject.TYPE_BOOLEAN]))
+        'validity-changed':
+            # The activity's validity has changed.
+            # An activity is valid if its name, color, type and ID have been
+            # set.
+            # Arguments:
+            #   validity: bool
+            (gobject.SIGNAL_RUN_FIRST, None, [bool]),
+        'disappeared':
+            # Nobody is in this activity any more.
+            # No arguments.
+            (gobject.SIGNAL_RUN_FIRST, None, []),
     }
 
     __gproperties__ = {
@@ -381,6 +390,7 @@ class Activity(ExportedGObject):
         """
         if buddy not in self._buddies:
             self._buddies.append(buddy)
+            buddy.add_activity(self)
             if self.props.valid:
                 self.BuddyJoined(buddy.object_path())
 
@@ -396,9 +406,13 @@ class Activity(ExportedGObject):
         """
         if buddy in self._buddies:
             self._buddies.remove(buddy)
+            buddy.remove_activity(self)
             if self.props.valid:
                 self.BuddyLeft(buddy.object_path())
 
+            if not self._buddies:
+                self.emit('disappeared')
+
     def _handle_share_join(self, tp, text_channel):
         """Called when a join to a network activity was successful.
 

services/presence/presenceservice.py

@@ -219,11 +219,12 @@ class PresenceService(ExportedGObject):
 
         activity.connect("validity-changed",
                          self._activity_validity_changed_cb)
+        activity.connect("disappeared", self._activity_disappeared_cb)
         self._activities[activity_id] = activity
         return activity
 
-    def _remove_activity(self, activity):
-        _logger.debug("remove activity %s" % activity.props.id)
+    def _activity_disappeared_cb(self, activity):
+        _logger.debug("activity %s disappeared" % activity.props.id)
 
         self.ActivityDisappeared(activity.object_path())
         del self._activities[activity.props.id]
@@ -259,7 +260,6 @@ class PresenceService(ExportedGObject):
 
             if activity is not None:
                 activity.buddy_joined(buddy)
-                buddy.add_activity(activity)
 
         activities_left = old_activities - new_activities
         for act in activities_left:
@@ -269,10 +269,6 @@ class PresenceService(ExportedGObject):
                 continue
 
             activity.buddy_left(buddy)
-            buddy.remove_activity(activity)
-
-            if not activity.get_joined_buddies():
-                self._remove_activity(activity)
 
     def _activity_invitation(self, tp, act_id):
         activity = self._activities.get(act_id)