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<concept id="GUID-F3CB6985-A9AA-4E01-B157-5AB8DDC7951B" xml:lang="en"><title>Finger

usable UI</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>This document describes stylus as the input method with touch UI, but events

apply to finger use also. However, in some cases the components may not be

finger optimized due to the size of objects, e.g. virtual keyboard or text

field.</p>

<p>In Symbian, UI style defines the target minimum sizes for a UI element considered

as finger usable:</p>

<ul>

<li><p>7 x 7 mm with 1 mm gaps for index finger usage </p></li>

<li><p>8 x 8 mm with 2 mm gaps for thumb usage </p></li>

<li><p>List type of components should have minimum of 5 mm line spacing</p></li>

</ul>

<p>Targets are general as in practice sizes can be use case dependent, e.g.

due to frequency of use, efficiency vs. error criticality or ease of error

correction, location of the button (edge of screen vs. center).</p>

<p>The visible area of the component and the component's active area should

be identical. There are exception cases to this rule though:</p>

<ul>

<li><p>When components are located near the edge of the display the touchable

area should extend fully to the edge of the display (i.e. beyond the components

visible graphics). </p></li>

<li><p>Visible area is smaller than the active area in order to keep the balance

in look and feel of the UI. For example scrollbar has wider touch area than

visible area. </p></li>

<li><p>Active area is smaller than the visible area in order to avoid unwanted

presses to contiguous active areas. In this case there it should be graphically

indicated where the user should tap. Example: fixed toolbar buttons in landscape

layout.</p></li>

</ul>

</conbody></concept>