Symbian3/SDK/Source/GUID-1C802DBD-1453-5C69-94D5-FB0229C544D6.dita
author Dominic Pinkman <dominic.pinkman@nokia.com>
Fri, 11 Jun 2010 12:39:03 +0100
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License 
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"Eclipse Public License v1.0" which accompanies this distribution, 
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors: 
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-1C802DBD-1453-5C69-94D5-FB0229C544D6" xml:lang="en"><title>Uikon
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Overview</title><prolog><metadata><keywords/></metadata></prolog><conbody>
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<section id="GUID-CB78AFE5-5471-49D0-9740-E3FDA18ED6E9"><title>Purpose</title> <p>Provides a framework for applications.
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The framework is fundamental to all GUI applications.</p> </section>
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<section id="GUID-74F7D413-3912-477E-A89E-D6BD5F395F9D"><title>Architectural relationships</title> <p>Uikon provides a UI
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library layer. It was designed to allow further higher level UI libraries
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to be added that can include controls that derive from the ones provided by
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Uikon. Avkon provides these higher level UI libraries in Symbian^3 and historically
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in the S60 platform. Application developers can use the Uikon APIs directly,
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though they should check that there is not a more appropriate Avkon API. </p> <p>The
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Uikon application framework extends two lower frameworks:</p> <ul>
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<li id="GUID-6941969D-7625-5376-A5D6-5E5B0378D0E7"><p>the Application Architecture
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Framework: handles application start-up and accessing the application data
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(its <i>document</i>). </p> </li>
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<li id="GUID-F1AA0F97-5205-537C-994A-6A3FA811AA72"><p>UI Control Framework:
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provides the framework for drawing and handling input to screen controls</p> </li>
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</ul> <p> Uikon ties these two frameworks together to provide the framework
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for the standard application design. </p> <p>Uikon's framework classes are
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extended in turn by:</p> <ul>
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<li id="GUID-EF33F5C8-6EA8-5D8A-AE53-A35C692E291A"><p>applications, to implement
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appropriate behaviour for their type of data, and for their types of command</p> </li>
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<li id="GUID-66353589-7D6B-548E-81A0-3A3515CF8BD8"><p>possibly by UI variant-specific
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libraries, to add UI variant-specific behaviour to the application framework</p> </li>
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</ul> </section>
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<section id="GUID-3B1FA50E-E199-46F3-B8A0-9370BECDE8E2"><title>Description</title> <p>The API has five key concepts: application
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(<codeph>CEikApplication</codeph>), document (<codeph>CEikDocument</codeph>),
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app UI (<codeph>CEikAppUi</codeph>), UI Environment (<codeph>CEikonEnv</codeph>),
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and utilities (<codeph>EikFileUtils</codeph>).</p> <p><b>Application</b> </p> <p>The application class defines properties of the application, such as UID
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and caption, and creates a new document.</p> <p>The application base class
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is provided by <xref href="GUID-E36E2F07-09E7-32BC-BB83-14DF9232E7D9.dita"><apiname>CEikApplication</apiname></xref>.</p> <p><b>Document</b> </p> <p>The document class represents the data model for
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the application. In file-based applications, it stores and restores the application's
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data. It handles requests to edit a document by creating an app UI.</p> <p>The
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document base class is provided by <xref href="GUID-B33A8A56-D1BE-3E3D-B5AC-F644A5C764DB.dita"><apiname>CEikDocument</apiname></xref>.</p> <p><b>App UI</b> </p> <p>The app UI is the central user interface class. It
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creates and owns controls to display the application data, and centralises
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handling of command input from standard controls such as menus and toolbars.</p> <p>The
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app UI base class is provided by <xref href="GUID-1185F595-0488-3E93-8D60-6B3A1A3AC32E.dita"><apiname>CEikAppUi</apiname></xref>, which can be
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customised by using the resource structure <xref href="GUID-77DF8122-9267-36A6-B5C5-AC989828F2EA.dita"><apiname>EIK_APP_INFO</apiname></xref>.</p> <p><b>UI Environment</b> </p> <p>The UI Environment provides a large number
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of assorted UI functionality, particularly simple access to information and
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query dialogs, and access to standard system UI resources (bitmaps and fonts).
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Every object in a GUI application can access a UI Environment (through <xref href="GUID-96CA3B4B-993F-36C0-9A5B-DF5CC74EE20E.dita#GUID-96CA3B4B-993F-36C0-9A5B-DF5CC74EE20E/GUID-3587E866-F434-30BA-9CFC-0D40EF8D47FE"><apiname>CEikonEnv::Static()</apiname></xref>),
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as a pointer to it is stored in thread-local storage.</p> <p>The UI Environment
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is provided by <xref href="GUID-96CA3B4B-993F-36C0-9A5B-DF5CC74EE20E.dita"><apiname>CEikonEnv</apiname></xref>.</p> <p><b>Utilities</b> </p> <p>Utility classes provide easy access for applications
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to frequently-used functionality. Notable are <xref href="GUID-EF4568CF-947B-3931-B860-2A63A6B7C275.dita"><apiname>EikFileUtils</apiname></xref> for
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file access, and <xref href="GUID-C886511D-1922-3703-843D-1936018788AC.dita"><apiname>EikResourceUtils</apiname></xref> for resource access.</p> </section>
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<section id="GUID-E0A48D84-08C6-44BC-B4A0-E8DF472DCB3B"><title>See also</title> <p><xref href="GUID-37E8A48E-09B8-5958-9263-B33EDAE3F7C6.dita">UI
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Control Framework Overview</xref> </p> </section>
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</conbody></concept>