author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Fri, 22 Jan 2010 18:26:19 +0000 | |
changeset 1 | 25a17d01db0c |
child 5 | f345bda72bc4 |
permissions | -rw-r--r-- |
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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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--> <!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"><concept id="GUID-B02C762B-C452-4184-ABEA-4753E6CD47D2" xml:lang="en"><title>Scalability</title><prolog><metadata><keywords></keywords></metadata></prolog><conbody> |
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<p>The term <i>scalability</i> refers to the ability of an application |
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UI to function as designed in mobile devices with different screen resolutions |
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or orientations. For example, in the figure below, the UI scales to fit both |
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portrait and landscape orientations.</p> |
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<fig id="GUID-573B32DC-5C53-47B2-8239-AA038E945E81"><title>Scaling</title><image href="GUID-5F9E2762-855A-4DE6-A11B-A5F0D51E19D9_d0e67243_href.png"></image></fig> |
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<p>When you enable scaling in your application, you allow your application |
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to support the different display sizes, resolutions, and layouts for different |
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devices based on the Symbian platform. The Symbian platform provides APIs |
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and other support to enable scaling in applications. Some scaling issues are |
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handled by the application framework if support is enabled, while other issues |
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need to be handled by the application. The details of what can be handled |
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where depend on the nature of your UI architecture. A general rule of thumb |
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is that the greater the degree of customization in your application, the more |
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you need to handle scalability issues in the application.</p> |
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<p>You are not required to enable scaling in your applications, although |
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it is recommended as it enhances usability for mobile device users.</p> |
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<p>The following issues should be kept in mind when enabling your application |
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for scaling:</p> |
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<ul> |
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<li><p>Layout information should not be hard-coded.</p> |
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<itemgroup> |
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<p> The Symbian platform provides the <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classAknLayoutUtils.html" format="application/java-archive"><parmname>AknLayoutUtils</parmname></xref> class |
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for building layouts from resource files.</p> |
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<p>Note that you also need to <xref href="GUID-DD15F24B-0786-4531-A6C5-A5E70EBE2732.dita">override <parmname>CCoeControl::HandleResourceChange</parmname> and <parmname>CEikAppUi::HandleResourceChangeL</parmname></xref> in your |
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application to draw your application again in the event that the orientation |
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of the display changes.</p> |
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</itemgroup> |
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</li> |
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<li><p>Scalable fonts should be used.</p> |
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<itemgroup> |
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<p>The Symbian platform provides methods in the <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classAknLayoutUtils.html" format="application/java-archive"><parmname>AknLayoutUtils</parmname></xref> for |
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using logical fonts from an enumeration in the avkon.hrh file.</p> |
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</itemgroup> |
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</li> |
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<li><p>Scalable icons should be used.</p> |
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<itemgroup> |
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<p>Scalable icons are based on SVG Tiny (SVG-T) format <xref href="GUID-D76B1001-BAF5-4557-A07E-61065523ECBE.dita">graphics</xref>.</p> |
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</itemgroup> |
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</li> |
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</ul> |
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</conbody></concept> |