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+++ b/Symbian3/SDK/Source/GUID-1FCD0312-7B28-47F9-BE54-822B74A8934C.dita	Wed Mar 31 11:11:55 2010 +0100
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+<?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-1FCD0312-7B28-47F9-BE54-822B74A8934C" xml:lang="en"><title>Designing
+applications for touch UI</title><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>Both touch screens and hybrid devices are supported by Symbian platform.
+Touch screen enables direct manipulation of content and objects, allowing
+for far more natural interaction with the device. This means a completely
+different user experience and interaction style compared to using a hardware
+keypad.</p>
+<fig id="GUID-0895B1BD-27D2-4824-A02C-F89137A16E53">
+<image href="GUID-59F26729-3FFB-48AE-91FB-4B9AC2955A06_d0e74654_href.png" scale="60" placement="inline"/>
+</fig>
+<p>All applications must be touch-enabled, which means that they can be used
+with the touch screen alone, regardless of the presence of a keypad. There
+are only three mandatory hardware keys in touch devices based
+on the Symbian platform - Send, End, and Multi-tasking key.</p>
+<p>The application features must follow the platform support for different
+hardware. When designing a touch-enabled Symbian application, the UI must
+be designed so that everything can be accomplished by using the touch screen
+interface, as the potential target devices may or may not have a hardware
+keyboard.  </p>
+<p>The touch UI in the Symbian platform is based on the use of resistive and
+capacitive touch screens. In <b>resistive touch screen</b> technology, two
+conductive and resistive layers are separated by a thin space. When an object
+touches this kind of touch panel, the layers are connected at a certain point,
+and a touch event is registered. This allows efficient stylus control, in
+addition to finger touch - unlike capacitive panels, which usually register
+only finger touch. Additionally, resistive touch screen offers a higher resolution
+and more durability. In <b>capacitive touch screen</b> technology, the panel
+consists of an insulator such as glass, coated with a transparent conductor
+(such as indium tin oxide (ITO)). When an object touches the surface of the
+screen, it results in a distortion of the local electrostatic field, measurable
+as a change in capacitance. Then a touch controller measures the frequency
+variations to ascertain the co-ordinates of the object's touch. Capacitive
+touch screen supports <xref href="GUID-17C64C2F-9426-4B41-9F0A-23060289D644.dita">multi-touch</xref>.</p>
+<p>The hardware is supported by various:</p>
+<ul>
+<li><p>touch-specific components (see <xref href="GUID-BB8B3A11-0BBC-4759-A7F4-A28C9E70573F.dita">Touch
+support for common UI components</xref>)</p></li>
+<li><p>component and UI behavior changes</p></li>
+<li><p>layout changes, and</p></li>
+<li><p>additions to the interaction style.</p></li>
+</ul>
+<p>The touch UI is designed to enable full task flow with touch, with minimal
+need to switch to hardware keys. Thus, the design ensures that users can complete
+a task with the chosen interaction method from start to finish. </p>
+<p>While designing and implementing applications for touch screen devices
+based on the Symbian platform, consider interactions that benefit the most
+from the touch UI.  </p>
+<p>If you can apply direct manipulation of the UI, for example when moving
+items from one place to another, or scrolling a page, do not confine the user
+with unnecessary scrollbars or have the user resort to options list commands.</p>
+<p>Instead, enable the user to view pages larger than a screen by panning
+them directly, and dragging and dropping items rather than marking them and
+using menu options. </p>
+<ul>
+<li><p>Remember that the most intuitive touch screen interactions that can
+be performed using a finger are tapping, stroking up/down/left/right, and
+the long tap. </p></li>
+<li><p>Utilize strokes that are easily discovered to the users in the given
+context. It should be explicit to the user where strokes can be performed. </p></li>
+<li><p>Design to ensure that users can complete a task with the same interaction
+method from start to finish - touch or hardware keys, stylus, or finger, and
+using one hand or both hands. </p></li>
+<li><p>Aim to optimize system performance and battery consumption to provide
+a fluid and reliable touch user experience. </p></li>
+</ul>
+<p><b>See Also</b>:</p>
+</conbody></concept>
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