--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-68B999C2-0993-4804-9624-42C3D88BE5C7.dita	Thu Jan 21 18:18:20 2010 +0000
@@ -0,0 +1,88 @@
+<?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 concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-68B999C2-0993-4804-9624-42C3D88BE5C7" xml:lang="en"><title>View
+architecture</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>The following image illustrates the components of the view architecture
+approach.</p>
+<fig id="GUID-A4D968BE-B048-424C-94B5-FAAA7B14C5D5"><title>View architecture classes</title><image href="GUID-2B50C6B1-E1E8-44E6-840B-7FAA206E6C26_d0e44021_href.png"/></fig>
+<p>Symbian platform applications that follow the view architecture require:</p>
+<ul>
+<li><p>a <xref href="GUID-FD2CDEB8-0784-4BE5-A775-170F57D71BBC.dita">UI
+controller</xref> derived from <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknViewAppUi.html" format="application/java-archive"><parmname>CAknViewAppUi</parmname></xref></p>
+</li>
+<li><p>a <xref href="GUID-DAC32BB9-C0EB-42FF-A596-C2F1A90A4BD7.dita">view
+controller</xref> derived from <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html" format="application/java-archive"><parmname>CAknView</parmname></xref></p>
+</li>
+<li><p>a <xref href="GUID-DAC32BB9-C0EB-42FF-A596-C2F1A90A4BD7.dita">view</xref> or
+views derived from <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html" format="application/java-archive"><parmname>CCoeControl</parmname></xref></p>
+</li>
+</ul>
+<p>The view architecture only allows one view to be active in each application.
+If a new view is switched to within an application, the current view is immediately
+deactivated, so this architectural approach is <i>not</i> appropriate in the
+following cases:</p>
+<ul>
+<li><p>Applications with any view that cannot cleanly handle unexpected
+activation of another view in that application.</p></li>
+<li><p>Applications that provide views that can be nested over other
+applications, except where embedding is used.</p></li>
+<li><p>Applications that provide controls that can be used inside
+other applications (for example, using a Web control inside an e-mail viewer
+to show an e‑mail with HTML content).</p></li>
+</ul>
+<p>Typical responsibilities in this architecture are:</p>
+<ul>
+<li><p><xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknViewAppUi.html" format="application/java-archive"><parmname>CAknViewAppUi</parmname></xref>-derived
+class acts as a <xref href="GUID-FD2CDEB8-0784-4BE5-A775-170F57D71BBC.dita">UI
+controller</xref>:</p>
+<itemgroup>
+<ul>
+<li><p>It creates one or more <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html" format="application/java-archive"><parmname>CAknView</parmname></xref>-derived
+view controllers.</p></li>
+<li><p>It handles <xref href="GUID-EF7FF39E-929F-4767-B475-5D582D37BB32.dita">events</xref> that
+are not handled by the view controllers.</p></li>
+<li><p>To switch between views, it activates and deactivates views.</p>
+</li>
+<li><p>It handles menu <xref href="GUID-4941C035-C359-4968-9BD5-31F44EE5F810.dita">commands</xref> passed
+to it by the view controllers.</p></li>
+<li><p>It receives events such as <xref href="GUID-DD15F24B-0786-4531-A6C5-A5E70EBE2732.dita">layout</xref> and <xref href="GUID-3B441CDC-AB7A-4D8D-A595-57C21E1D426C.dita">foreground</xref> notifications
+from the run-time environment.</p></li>
+</ul>
+</itemgroup>
+</li>
+<li><p><xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html" format="application/java-archive"><parmname>CAknView</parmname></xref>-derived
+class acts as a <xref href="GUID-FD2CDEB8-0784-4BE5-A775-170F57D71BBC.dita">view
+controller</xref></p>
+<itemgroup>
+<ul>
+<li><p>It creates one of more <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html" format="application/java-archive"><parmname>CCoeControl</parmname></xref>-derived
+views.</p></li>
+<li><p>It handles registering controls for <xref href="GUID-E402616A-7ED8-45AC-B836-99C3A3760B33.dita">key
+event handling</xref>.</p></li>
+<li><p>It handles menu <xref href="GUID-4941C035-C359-4968-9BD5-31F44EE5F810.dita">commands</xref>.</p>
+</li>
+</ul>
+</itemgroup>
+</li>
+<li><p><xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Control_Environment/CCoeControlClass.html" format="application/java-archive"><parmname>CCoeControl</parmname></xref>-derived
+view:</p>
+<itemgroup>
+<ul>
+<li><p>Shows application data and state on the screen.</p></li>
+</ul>
+</itemgroup>
+</li>
+</ul>
+<p>For information on the <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknApplication.html" format="application/java-archive"><parmname>CAknApplication</parmname></xref> and <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknDocument.html" format="application/java-archive"><parmname>CAknDocument</parmname></xref>-derived
+classes, see <xref href="GUID-BDDDF68F-F7C3-43AF-8B6C-C77C701FD2A9.dita">Framework
+requirements for GUI applications</xref>.</p>
+</conbody></concept>
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