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Symbian3/SDK/Source/GUID-DAC32BB9-C0EB-42FF-A596-C2F1A90A4BD7.dita
changeset 0 89d6a7a84779 
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Symbian3/SDK/Source/GUID-DAC32BB9-C0EB-42FF-A596-C2F1A90A4BD7.dita	Thu Jan 21 18:18:20 2010 +0000
@@ -0,0 +1,86 @@
+<?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-DAC32BB9-C0EB-42FF-A596-C2F1A90A4BD7" xml:lang="en"><title>Views</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>The term <i>view</i> refers to the <xref href="GUID-BDDDF68F-F7C3-43AF-8B6C-C77C701FD2A9.dita">MVC
+design</xref> (Model-View-Controller) component that has the following attributes:</p>
+<ul>
+<li><p>displays the application state known by the application</p>
+</li>
+<li><p>receives user input</p></li>
+<li><p>is owned by the <xref href="GUID-FD2CDEB8-0784-4BE5-A775-170F57D71BBC.dita">UI
+controller</xref></p></li>
+<li><p>observes application state changes either directly or through
+the UI controller and updates the screen accordingly</p></li>
+</ul>
+<p>In practice, views are collections of interface elements, such as controls,
+menus, command button areas (CBAs), key events, that make up one top-level
+window in an application. Applications may have one or more views. If an application
+has more than one view and if the status pane behavior is organized in this
+manner, then each view in an application can have its own tab. Applications
+can have only a single view active at any one time. The current view is the
+view that interacts with the user, receiving events and menu choices as if
+it were the only set of UI elements.</p>
+<p>Multiple view architectures are widely used in application development
+on the Symbian platform. Multiple view architectures:</p>
+<ul>
+<li><p>provide developers with an efficient way to build multiple
+views within an application and switch between them easily and simply. </p>
+</li>
+<li><p>allow applications to bundle their user interface requirements
+into a single element (a view). The view architecture then provides the capability
+to switch quickly between the views.</p></li>
+<li><p>allow applications to take advantage of object orientation
+to encapsulate code, keeping it simple and clear. </p></li>
+<li><p>provide the ability for one application to activate the view
+of another. This is particularly useful when you want to use an existing display
+or editing capability without going to the expense of integrating a component
+into your application. </p></li>
+<li><p>allow applications to register views, with one view being
+active in each running application at any one time. It does not dictate what
+a view is; however, it does provide support for a view being a display page
+on the screen</p></li>
+</ul>
+<fig id="GUID-DD277261-3BF3-4F60-87BC-3ABC709C1E09"><title>Controller-view hierarchy in traditional and Symbian architectures</title><image href="GUID-5F5F9DF5-E08E-47F9-B35C-E07180524864_d0e43117_href.png"/></fig>
+<p>In practice, the view concept varies depending upon your chosen architecture
+approach: </p>
+<section id="GUID-53125010-FFC7-422E-9EE5-A42427031F10"><title>Traditional architecture
+views</title>
+<p>In a traditional architecture, the view is 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>, which typically constructs a top-level
+window-owning control that draws itself and contains other controls.</p>
+<p>For more information on views in tradition architecture approaches,
+see <xref href="GUID-B5DE1C86-2B16-4B22-887F-7079E54A8ED6.dita">Traditional
+Symbian UI application architecture</xref>.</p>
+</section>
+<section id="GUID-B473202D-9682-4EBA-83F2-8391DB2B56D9"><title>Symbian architecture
+views</title>
+<p>In Symbian view architecture, a view controller is added between the <xref href="GUID-FD2CDEB8-0784-4BE5-A775-170F57D71BBC.dita">UI controller</xref> and
+the view that draws itself and contains other controls. For example, view
+controllers can be used to specify CBAs that are specific to specific views.</p>
+<p>In a Symbian architecture, the view controller is derived from <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html" format="application/java-archive"><parmname>CAknView</parmname></xref>,
+which is derived directly from <xref href="jar:GUID-35228542-8C95-4849-A73F-2B4F082F0C44.jar!/sdk/doc_source/reference/reference-cpp/Kernel_Architecture_2/CBaseClass.html#%3a%3aCBase" format="application/java-archive"><parmname>CBase</parmname></xref> and
+not 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>. This means the <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html" format="application/java-archive"><parmname>CAknView</parmname></xref>-derived
+views are not controls. <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknView.html" format="application/java-archive"><parmname>CAknView</parmname></xref>-derived
+views need to contain <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
+classes to provide visual representation on the display.</p>
+<p>For more information on views in Symbian architecture approaches,
+see <xref href="GUID-68B999C2-0993-4804-9624-42C3D88BE5C7.dita">View
+architecture</xref>.</p>
+</section>
+<section id="GUID-C9AA9483-424E-4626-8335-5F70FE246E1D"><title>Dialog architecture
+views</title>
+<p>In dialog architectures, views are implemented in modeless dialog boxes.
+Multiple views can be constructed using nested dialogs or a tabbed dialog
+pane.</p>
+<p>For more information on views in dialog architecture approaches, see <xref href="GUID-DD88DD7B-E246-4BF2-B537-5C677728CC49.dita">Dialog
+architecture</xref>.</p>
+</section>
+</conbody></concept>
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MCL/sftools/depl/docscontent