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.. include:: headings.inc

.. currentmodule:: wx.lib.pubsub.core.notificationmgr

.. highlight:: python



.. _wx.lib.pubsub.core.notificationmgr.INotificationHandler:

==========================================================================================================================================
|phoenix_title|  **wx.lib.pubsub.core.notificationmgr.INotificationHandler**
==========================================================================================================================================

Defines the interface expected by pubsub for pubsub activity 
notifications. Any instance that supports the same methods, or 
derives from this class, will work as a notification handler
for pubsub events (see pub.addNotificationHandler).



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|class_hierarchy| Class Hierarchy
=================================

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|method_summary| Methods Summary
================================

=================================================================================== ================================================================================
:meth:`~wx.lib.pubsub.core.notificationmgr.INotificationHandler.notifyDeadListener` Called when a listener has been garbage collected.
:meth:`~wx.lib.pubsub.core.notificationmgr.INotificationHandler.notifyDelTopic`     Called whenever a topic is removed from topic tree.
:meth:`~wx.lib.pubsub.core.notificationmgr.INotificationHandler.notifyNewTopic`     Called whenever a new topic is added to the topic tree.
:meth:`~wx.lib.pubsub.core.notificationmgr.INotificationHandler.notifySend`         Called multiple times during a sendMessage: once before message
:meth:`~wx.lib.pubsub.core.notificationmgr.INotificationHandler.notifySubscribe`    Called when a listener is subscribed to a topic.
:meth:`~wx.lib.pubsub.core.notificationmgr.INotificationHandler.notifyUnsubscribe`  Called when a listener is unsubscribed from given topic.
=================================================================================== ================================================================================


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|api| Class API
===============


.. class:: INotificationHandler

   Defines the interface expected by pubsub for pubsub activity 
   notifications. Any instance that supports the same methods, or 
   derives from this class, will work as a notification handler
   for pubsub events (see pub.addNotificationHandler).

   .. method:: notifyDeadListener(self, pubListener, topicObj)

      Called when a listener has been garbage collected.
      :param pubListener: the pubsub.core.Listener that wraps GC'd listener.
      :param topicObj: the pubsub.core.Topic object it was subscribed to.


   .. method:: notifyDelTopic(self, topicName)

      Called whenever a topic is removed from topic tree.
      :param topicName: name of topic removed.


   .. method:: notifyNewTopic(self, topicObj, description, required, argsDocs)

      Called whenever a new topic is added to the topic tree.
      :param topicObj: the Topic object for the message.
      :param description: docstring for the topic.
      :param required: list of message data names (keys in argsDocs) that are required.
      :param argsDocs: dictionary of all message data names, with the 
      corresponding docstring. 


   .. method:: notifySend(self, stage, topicObj, pubListener=None)

      Called multiple times during a sendMessage: once before message
      sending has started (pre), once for each listener about to be sent the 
      message, and once after all listeners have received the message (post).
      :param stage: 'pre', 'post', or 'loop'.
      :param topicObj: the Topic object for the message.
      :param pubListener: None for pre and post stages; for loop, the listener
          that is about to be sent the message.


   .. method:: notifySubscribe(self, pubListener, topicObj, newSub)

      Called when a listener is subscribed to a topic.
      :param pubListener: the pubsub.core.Listener that wraps subscribed listener.
      :param topicObj: the pubsub.core.Topic object subscribed to.
      :param newSub: false if pubListener was already subscribed. 


   .. method:: notifyUnsubscribe(self, pubListener, topicObj)

      Called when a listener is unsubscribed from given topic.
      :param pubListener: the pubsub.core.Listener that wraps unsubscribed listener.
      :param topicObj: the pubsub.core.Topic object unsubscribed from.