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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

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

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

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

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

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

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

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

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

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

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

    22 </ul></p>

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

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

    25 used in combination with traditional scroll keys, optical joystick performs

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

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

    28 optical joystick emulates the functions of mechanical scroll keys. Sliding

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

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

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

    32 9-way navigation</title><p>The Symbian platform supports additional optical

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

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

    35 main directions. Optical navigation allows continues moment of the finger

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

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

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

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

    40 with acceleration sensors:<ol>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    59 </conbody></concept>