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<concept id="GUID-930F1E88-2A03-4BD1-AA2A-3A0128A844BD" xml:lang="en"><title>Enabling
Multi-Touch in the Emulator Tutorial</title><shortdesc>This topic describes how to configure the Symbian emulator to enable
a multi-touch environment. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
<p><b>Variant</b>: <xref href="GUID-D93978BE-11A3-5CE3-B110-1DEAA5AD566C.dita">ScreenPlay</xref>. <b>Target
audience</b>: Application developers. </p>
<p>This topic builds on <xref href="GUID-9126A296-0301-4077-A183-3D703F77C548.dita">Multi-Touch
Support in the Emulator Overview</xref>.</p>
<section id="GUID-4F4F8E71-517D-4C5D-96A4-BB17CD49FD4C">       <title>Configuring
the emulator</title> <p>Make sure that two or more mice are plugged in and
detected on the Windows PC on which the emulator will run.  The number of
detected mice can be from two up to the maximum number defined in the HAL <codeph>HALData::EPointerMaxPointers</codeph> attribute. </p><ol>
<li id="GUID-63F317A2-E4EA-48BD-8F2B-40B54BF35EC6"><p>Add the following lines
to the <filepath>\epoc32\data\epoc.ini</filepath> file. These lines enable
ScreenPlay and multi-touch.</p><codeblock xml:space="preserve">SYMBIAN_BASE_USE_GCE ON
EnableMultiTouch ON</codeblock></li>
<li id="GUID-CA823DAB-C8C4-4E09-8491-0C0BCD57BAE4"><p>Specify the <codeph>MultiTouchProximityStep</codeph> and <codeph>MultiTouchPressureStep</codeph> values in the <filepath>\epoc32\data\epoc.ini</filepath> file to define
the proximity and pressure steps.</p><codeblock xml:space="preserve">MultiTouchProximityStep 10
MultiTouchPressureStep 200
</codeblock><p>If the above two options are not defined in the <filepath>epoc.ini</filepath> file,
the default proximity and pressure steps are taken from the following HAL
attributes.</p><codeblock xml:space="preserve">HALData::EPointer3DProximityStep
HALData::EPointer3DPressureStep</codeblock></li>
</ol><p><b>Result</b>: Launch the emulator to verify that the mice are detected
and displayed inside the application window area. When you move a mouse or
scroll the mouse wheel, its X, Y and Z values are reflected in the status
bar.</p>     </section>
<section id="GUID-44C3561D-92A1-421E-9AD3-0D8648919C46-GENID-1-10-1-12-1-1-7-1-6-1-6-1-9-1-9-1-8-1-6-1-3-4">       <title>Enabling
and disabling multi-touch</title><p>Multi-touch is only required by UI applications.
Therefore, multi-touch is enabled inside the orange rectangular area shown
on the following diagram. Inside the area two Windows pointers are displayed.
The one numbered zero is the system pointer and the other is used only for
multi-touch purposes. The first mouse to report events to the emulator is
automatically taken as the primary mouse, which owns the Windows system pointer.</p><fig id="GUID-C62E31A2-65F8-4976-A3A9-058BFE3D30D3">
<title>Multi-touch area</title>
<image href="GUID-FD0593E7-A36C-4656-A85A-9D62DFBCC42F_d0e194260_href.png" placement="inline"/>
</fig><p><b>System pointer</b>. Once the system pointer moves outside multi-touch
area, multi-touch is temporarily disabled and standard emulator pointer behavior
is resumed. This means that only one Windows system pointer is displayed and
it is controlled by both mice.</p>     <p><b>Non-system pointer</b>. If the
non-system pointer moves out of the multi-touch area, the pointer just disappears
from the screen. Disabling multi-touch is then not necessary because the system
pointer behaves normally inside the multi-touch area. Moving the non-system
pointer back into the area makes it reappear on the screen.</p>     </section>
</conbody><related-links>
<link href="GUID-9126A296-0301-4077-A183-3D703F77C548.dita"><linktext>Multi-Touch
Support in the Emulator Overview</linktext></link>
</related-links></concept>