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<concept id="GUID-F5371A59-A637-4623-A2C0-9A8B8E5F3CFB" xml:lang="en"><title>Interaction

with other hardware components</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>In addition to traditional keys, interaction devices of other types may

be built in the devices. In most scenarios, they produce input events similar

to keys, so that the software need not be changed. The hardware commands do

not have any effect on the application.</p>

<p>Examples of specific interaction devices are:<ul>

<li><p>Optical joysticks</p></li>

<li><p>Optical 9-way finger navigation</p></li>

<li><p>Acceleration sensors</p></li>

</ul></p>

<section id="GUID-C70CF894-EACC-470A-98C7-846B7FBC4F04"><title>Optical joystick</title><p>An optical joystick can be used

instead of (or in addition to) the traditional navigation keys. </p><p>When

used in combination with traditional scroll keys, optical joystick performs

same functions as that of mechanical scroll keys. However, the speed of the

movement can differ. </p><p>When used individually as the only scrolling device,

optical joystick emulates the functions of mechanical scroll keys. Sliding

a finger down over the joystick provides the same function as that of pressing

the down key. Repeat functionality can be produced with longer strokes. </p></section>

<section id="GUID-DF3C81F4-2FAD-4373-8568-0CFC6C7F9618">       <title>Optical

9-way navigation</title><p>The Symbian platform supports additional optical

navigation that is integrated to centre Select key. The supported directions

in 9-way rocker key are domed main directions and diagonals by combining the

main directions. Optical navigation allows continues moment of the finger

as observed in touch pad. It is suitable for pointer moving in browser and

content panning, for example, in photos, browser, and maps.</p></section>

<section id="GUID-10494E4E-B037-4874-BEFB-20AB95B61CBA"><title>Acceleration

sensor</title><p>There are three types of interaction events that can be recognized

with acceleration sensors:<ol>

<li id="GUID-704B967F-7E70-4446-B443-DDCA665D80BE"><p>Tapping the device by

hand (double tap) to perform a given function in set events. Tapping interaction

is not recommended for touch devices to prevent the unintentional touch actions.</p></li>

<li id="GUID-43884A1A-DE03-4074-8D35-4C5254159F14"><p>Changing the device’s

orientation from portrait to landscape and back to perform screen re-orientation.</p></li>

<li id="GUID-C07401D7-3AD2-4D74-B61D-E08A95F4E504"><p>Changing the device

orientation from screen up (for example on a table) to screen down and back

to silence an alert tone (for example, silencing an incoming call).</p></li>

</ol></p>The system is capable of sensing any of listed events. The supported

sensor interactions are configurable per device, but must be consistent in

not assigning different functions to these standard events. Also, the user

can be provided with the option to set the desired interactions. For example,

it is possible to set methods 1 and 3 (double tap by hand and turning the

screen downwards) for the 'silence incoming call' event. The settings are

available in <b>General Settings</b>. A double tap on the device produces

tactile (vibrating) feedback to reinforce and acknowledge that the interaction

is successful. See <xref href="GUID-581A8E4B-12BE-41C0-A20E-3087A80FEECF.dita">Tactile

feedback</xref> for more details.</section>

</conbody></concept>