author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Thu, 21 Jan 2010 18:18:20 +0000 | |
changeset 0 | 89d6a7a84779 |
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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-8661A7E0-F19A-41F8-9062-FBFAE70CF658" xml:lang="en"><title>Tactile |
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feedback client API</title><shortdesc>The Tactile feedback client API is used for producing tactile feedback |
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for different touch events.</shortdesc><prolog><metadata><keywords></keywords></metadata></prolog><conbody> |
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<p>The Tactile feedback client API is a library API that has been implemented |
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with a client-server technique. A major part of the processing is done on |
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the client side, and thus API calls don't necessarily generate a client-server |
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transaction immediately. Instead for e.g. changes to area registry are buffered, |
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and then transferred to server-side at once.</p> |
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<p>You can use tactile feedback in, for example, the following cases:</p> |
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<ul> |
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<li>When the user starts to scroll with the scroll bar, user can feel and/or |
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hear when the scroll bar thumb has been caught.</li> |
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<li>When button is pressed, user can feel and/or hear the button being pressed.</li> |
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</ul> |
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<p>The concept of logical feedback type is very important from this API's |
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point of view. </p> |
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<p>In practice it means that, for example, you should not try to use this |
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API for producing vibrator feedback only. Instead, logical feedback types |
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such as "basic" or "sensitive" are used on this level, and the actual physical |
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effect then depends on the settings and device configuration. This way the |
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feedback works in a unified way from the end user point of view in the whole |
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device.</p> |
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<section id="GUID-44CAF194-6B6A-4661-AB29-88BF700BBC60"><p>For user experience guidelines on tactile feedback, see <xref href="GUID-581A8E4B-12BE-41C0-A20E-3087A80FEECF.dita">Tactile feedback</xref>.</p><p>For |
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information on using the API, see <xref href="GUID-786D76B7-B827-43B7-8202-BA7A7E5EE03E.dita">Providing |
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tactile feedback for touch events</xref>.</p><p>For the Tactile feedback client |
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API classes and header files, see Classes |
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and Definitions.</p></section> |
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<section id="GUID-E44747A5-92BF-4D7A-895C-C469112A4D32"><title>API class structure</title><p>All functionality of the Tactile |
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feedback client API is provided in the class <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classMTouchFeedback.html" format="application/java-archive"><codeph>MTouchFeedback</codeph></xref>.</p></section> |
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<section id="GUID-0D0648C0-5AAE-48C1-82BD-025D6908E3B1"><title>Constraints</title><p>This API is valid for all platforms |
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running on Symbian OS 9.4 or later.</p></section> |
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<section id="GUID-E8D3D7BC-F365-45D7-A4AE-4393CF1B6795"><title>Error handling</title><p>The leave mechanism of Symbian environment is used to handle memory exhaustion. The panic mechanism is not |
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used.</p> <p>The table below presents possible error conditions and responses |
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to them.</p> <table id="GUID-E9186B9F-2C9B-4C09-B054-69D093BBE41D"><title>Possible |
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error situations when using Tactile Feedback Client API</title> |
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<tgroup cols="2"><colspec colname="col1"></colspec><colspec colname="col2"></colspec> |
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<thead> |
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<row> |
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<entry>Error situation</entry> |
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<entry>Response</entry> |
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</row> |
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</thead> |
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<tbody> |
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<row> |
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<entry><codeph>SetFeedbackArea</codeph> returns <codeph>KErrNoMemory</codeph> in |
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case of an OOM situation.</entry> |
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<entry>This error can usually be ignored by the application.</entry> |
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</row> |
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<row> |
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<entry><codeph>SetFeedbackArea</codeph> returns <codeph>KErrArgument</codeph></entry> |
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<entry>The given <codeph>CCoeControl</codeph> pointer is a <codeph>NULL</codeph> pointer |
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or the control does not have any window associated with it (i.e., the feedback |
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area setting is attempted before <codeph>SetContainerWindow</codeph> has been |
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called on the control).</entry> |
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</row> |
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<row> |
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<entry><codeph>SetFeedbackArea</codeph> returns <codeph>KErrNotSupported</codeph>.</entry> |
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<entry>The given logical feedback type or triggering event type is out of |
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range.</entry> |
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</row> |
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<row> |
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<entry>A tactile feedback enabled control is moved with <codeph>CCoeControl::SetPosition</codeph>, |
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but the feedback area is not moved.</entry> |
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<entry>The control must override the <codeph>CCoeControl::PositionChanged</codeph> function, |
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and update the feedback area there the same way as in the <codeph>SizeChanged</codeph> function.</entry> |
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</row> |
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<row> |
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<entry>Area registry updates not are effective fast enough. This might happen |
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in some applications which use very many frequently running active objects, |
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so that the <codeph>CIdle</codeph> object used by the implementation of this |
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API gets no change to run.</entry> |
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<entry>Use the <codeph>FlushRegistryUpdates</codeph> function for forcing |
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an update to the server side after doing all updates on the client side.</entry> |
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</row> |
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<row> |
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<entry>A control's feedback areas are not automatically disabled when the |
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control is dimmed.</entry> |
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<entry><codeph>CCoeControl::SetMopParent</codeph> has not been called on the |
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control, and thus the object provider hierarchy is broken.</entry> |
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</row> |
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</tbody> |
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</tgroup> |
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</table></section> |
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<section id="GUID-2190CCB3-0569-4A43-A300-BBE83AAD64B6"><title>Memory overhead</title><p>Using direct feedback does not cause |
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additional memory overhead.</p> <p>Area registry based feedback consumes approximately |
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32 bytes for each feedback area.</p></section> |
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<section id="GUID-F903AC63-2526-4767-B326-56D43344B23B"><title>Extensions to the API</title><p>New logical feedback types |
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can be added in later releases. Otherwise the Tactile feedback client API |
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does not explicitly support any kinds of extensions to it.</p></section> |
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</conbody></concept> |