From d859ec2ea19654603075b556094c6b59aad8e73a Mon Sep 17 00:00:00 2001
From: mathieui <mathieui@mathieui.net>
Date: Wed, 30 Apr 2014 20:37:18 +0200
Subject: Add a 'tab_change' event

---
 doc/source/dev/events.rst | 6 ++++++
 src/core/core.py          | 3 +++
 src/events.py             | 2 ++
 3 files changed, 11 insertions(+)

diff --git a/doc/source/dev/events.rst b/doc/source/dev/events.rst
index dda25561..7092d66b 100644
--- a/doc/source/dev/events.rst
+++ b/doc/source/dev/events.rst
@@ -7,6 +7,12 @@ The following events are poezio-only events, for SleekXMPP events, check out
 .. glossary::
     :sorted:
 
+    tab_change
+        - **old_tab_nb:** :py:class:`int` Old current tab number.
+        - **new_tab_nb:** :py:class:`int` New current tab number.
+
+        Triggered whenever the user switches between tabs.
+
     muc_say
         - **message:** :py:class:`~sleekxmpp.Message` that will be sent
         - **tab:** :py:class:`~tabs.MucTab` source
diff --git a/src/core/core.py b/src/core/core.py
index 19eb9b16..4ffb0213 100644
--- a/src/core/core.py
+++ b/src/core/core.py
@@ -1098,12 +1098,15 @@ class Core(object):
         Prevents the tab number from going over the total number of opened
         tabs, or under 0
         """
+        old = self._current_tab_nb
         if value >= len(self.tabs):
             self._current_tab_nb = 0
         elif value < 0:
             self._current_tab_nb = len(self.tabs) - 1
         else:
             self._current_tab_nb = value
+        if old != self._current_tab_nb:
+            self.events.trigger('tab_change', old, self._current_tab_nb)
 
     ### Opening actions ###
 
diff --git a/src/events.py b/src/events.py
index 71687d14..50711022 100644
--- a/src/events.py
+++ b/src/events.py
@@ -45,6 +45,7 @@ class EventHandler(object):
             'muc_ban': [],
             'send_normal_presence': [],
             'ignored_private': [],
+            'tab_change': [],
             }
 
     def add_event_handler(self, name, callback, position=0):
@@ -72,6 +73,7 @@ class EventHandler(object):
         if callbacks is None:
             log.debug('%s: No such event.', name)
             return
+        log.debug('Event %s triggered, callbacks: %s', name, callbacks)
         for callback in callbacks:
             callback(*args, **kwargs)
 
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