From a7ce2b28c35bc3a8421d989fcc3c02fd8c300792 Mon Sep 17 00:00:00 2001
From: Yann Leboulanger <asterix@lagaule.org>
Date: Sat, 10 Mar 2007 11:30:23 +0000
Subject: [PATCH] [Mikhail Gusarov and me] Use listeners when an event is added
 / removed to the events class and use them to update systray.

---
 src/common/events.py | 43 ++++++++++++++++++++++++++++++++++---------
 src/systray.py       | 21 +++++++++++++++++++++
 2 files changed, 55 insertions(+), 9 deletions(-)

diff --git a/src/common/events.py b/src/common/events.py
index c17d2c2ea..5d43efea7 100644
--- a/src/common/events.py
+++ b/src/common/events.py
@@ -21,7 +21,6 @@
 ##
 
 import time
-import gajim
 
 class Event:
 	'''Information concerning each event'''
@@ -48,6 +47,36 @@ class Events:
 	'''Information concerning all events'''
 	def __init__(self):
 		self._events = {} # list of events {acct: {jid1: [E1, E2]}, }
+		self._event_added_listeners = []
+		self._event_removed_listeners = []
+
+	def event_added_subscribe(self, listener):
+		'''Add a listener when an event is added to the queue'''
+		if not listener in self._event_added_listeners:
+			self._event_added_listeners.append(listener)
+
+	def event_added_unsubscribe(self, listener):
+		'''Remove a listener when an event is added to the queue'''
+		if listener in self._event_added_listeners:
+			self._event_added_listeners.remove(listener)
+
+	def event_removed_subscribe(self, listener):
+		'''Add a listener when an event is removed from the queue'''
+		if not listener in self._event_removed_listeners:
+			self._event_removed_listeners.append(listener)
+
+	def event_removed_unsubscribe(self, listener):
+		'''Remove a listener when an event is removed from the queue'''
+		if listener in self._event_removed_listeners:
+			self._event_removed_listeners.remove(listener)
+
+	def fire_event_added(self, event):
+		for listener in self._event_added_listeners:
+			listener(event)
+
+	def fire_event_removed(self):
+		for listener in self._event_removed_listeners:
+			listener()
 
 	def change_account_name(self, old_name, new_name):
 		if self._events.has_key(old_name):
@@ -77,8 +106,7 @@ class Events:
 			self._events[account][jid] = [event]
 		else:
 			self._events[account][jid].append(event)
-		if event.show_in_systray and gajim.interface.systray_capabilities:
-			gajim.interface.systray.set_img()
+		self.fire_event_added(event)
 
 	def remove_events(self, account, jid, event = None, types = []):
 		'''if event is not specified, remove all events from this jid,
@@ -94,8 +122,7 @@ class Events:
 					del self._events[account][jid]
 				else:
 					self._events[account][jid].remove(event)
-				if event.show_in_systray and gajim.interface.systray_capabilities:
-					gajim.interface.systray.set_img()
+				self.fire_event_deleted(event)
 				return
 			else:
 				return True
@@ -110,13 +137,11 @@ class Events:
 				self._events[account][jid] = new_list
 			else:
 				del self._events[account][jid]
-			if gajim.interface.systray_capabilities:
-				gajim.interface.systray.set_img()
+			self.fire_event_removed()
 			return
 		# no event nor type given, remove them all
 		del self._events[account][jid]
-		if gajim.interface.systray_capabilities:
-			gajim.interface.systray.set_img()
+		self.fire_event_removed()
 
 	def change_jid(self, account, old_jid, new_jid):
 		if not self._events[account].has_key(old_jid):
diff --git a/src/systray.py b/src/systray.py
index cc5d1933b..d010a5543 100644
--- a/src/systray.py
+++ b/src/systray.py
@@ -59,6 +59,25 @@ class Systray:
 		self.xml.signal_autoconnect(self)
 		self.popup_menus = []
 
+	def subscribe_events(self):
+		'''Register listeners to the events class'''
+		gajim.events.event_added_subscribe(self.on_event_added)
+		gajim.events.event_removed_subscribe(self.on_event_removed)
+
+	def unsubscribe_events(self):
+		'''Unregister listeners to the events class'''
+		gajim.events.event_added_unsubscribe(self.on_event_added)
+		gajim.events.event_removed_unsubscribe(self.on_event_removed)
+
+	def on_event_added(self, event):
+		'''Called when an event is added to the event list'''
+		if event.show_in_systray:
+			self.set_img()
+
+	def on_event_removed(self):
+		'''Called when one or more events are removed from the event list'''
+		self.set_img()
+
 	def set_img(self):
 		if not gajim.interface.systray_enabled:
 			return
@@ -373,9 +392,11 @@ class Systray:
 			eb.add(self.img_tray)
 			self.t.add(eb)
 			self.set_img()
+			self.subscribe_events()
 		self.t.show_all()
 
 	def hide_icon(self):
 		if self.t:
 			self.t.destroy()
 			self.t = None
+			self.unsubscribe_events()