--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-13D2B45C-3A2A-497A-8D6A-87BE34D1DE69.dita	Thu Jan 21 18:18:20 2010 +0000
@@ -0,0 +1,68 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE task
+  PUBLIC "-//OASIS//DTD DITA Task//EN" "task.dtd">
+<task id="GUID-13D2B45C-3A2A-497A-8D6A-87BE34D1DE69" xml:lang="en"><title>Implement
+the observer functions</title><prolog><metadata><keywords/></metadata></prolog><taskbody>
+<context><p>An application can register as an observer of a view by implementing
+the following observer interfaces. Observers can register with the View Server
+as activation observers, deactivation observers or as generic observers.</p><table id="GUID-7159BD7C-6466-4CA8-9211-FD33273C9784">
+<tgroup cols="3"><colspec colname="col1"/><colspec colname="col2"/><colspec colname="col3"/>
+<thead>
+<row>
+<entry valign="top"><p>Interface</p></entry>
+<entry valign="top"><p>Notification</p></entry>
+<entry valign="top"><p>Method to override</p></entry>
+</row>
+</thead>
+<tbody>
+<row>
+<entry><p><codeph>MCoeViewActivationObserver </codeph></p></entry>
+<entry><p>View activation notification for the specified view.</p></entry>
+<entry><p><codeblock xml:space="preserve">IMPORT_C void NotifyNextActivation(TVwsViewId&amp; aViewId,  MCoeViewActivationObserver&amp; aViewActivationObserver)
+</codeblock></p></entry>
+</row>
+<row>
+<entry><p><codeph>MCoeViewActivationObserver </codeph></p></entry>
+<entry><p>View activation notification for any view registered with view server.</p></entry>
+<entry><p><codeblock xml:space="preserve">IMPORT_C void NotifyNextActivation(MCoeViewActivationObserver&amp; aViewActivationObserver)
+</codeblock></p></entry>
+</row>
+<row>
+<entry><p><codeph>MCoeViewDeactivationObserver </codeph></p></entry>
+<entry><p>View deactivation notification for the specified view.</p></entry>
+<entry><p><codeblock xml:space="preserve">IMPORT_C void NotifyNextDeactivation (TVwsViewId&amp; aViewId, MCoeViewDeactivationObserver&amp; aViewDeactivationObserver)
+</codeblock></p></entry>
+</row>
+<row>
+<entry><p><codeph>MCoeViewDeactivationObserver </codeph></p></entry>
+<entry><p>View deactivation notification for any view registered with view
+server.</p></entry>
+<entry><p><codeblock xml:space="preserve">IMPORT_C void NotifyNextDeactivation (MCoeViewDeactivationObserver&amp; aViewDeactivationObserver)
+</codeblock></p></entry>
+</row>
+</tbody>
+</tgroup>
+</table><p>The following code snippet shows implementing the <codeph>MCoeViewActivationObserver</codeph> observer
+interface class:</p><codeblock xml:space="preserve">/** 
+CMCoeViewActivationObserver  - implements the MCoeViewActivationObserver interface for notifications only
+*/
+CMCoeViewActivationObserver* CMCoeViewActivationObserver::NewL()    
+    {
+    CMCoeViewActivationObserver* self=new( ELeave ) CMCoeViewActivationObserver();
+    return self;
+    }
+void CMCoeViewActivationObserver::HandleViewActivation( const TVwsViewId&amp; aNewlyActivatedViewId,
+                                                        const TVwsViewId&amp; aViewIdToBeDeactivated )    
+    {_
+    LIT( Kmessage, "Notified MCoeViewActivationObserver::HandleViewActivation: Newly Active View: 0x%x - Deactivate 0x%x" )    
+    INFO_PRINTF2( Kmessage, aNewlyActivatedViewId.iViewUid.iUid, aViewIdToBeDeactivated.iViewUid.iUid );
+    }</codeblock></context>
+</taskbody></task>
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