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-->  <!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"><concept id="GUID-11C24609-3B6D-4B44-B003-FB0C07444A9E" xml:lang="en"><title>Scroll

pane</title><prolog><metadata><keywords></keywords></metadata></prolog><conbody>

<p>With any list, grid or other component that can be scrolled vertically,

a scrollbar appears on the right-hand side of the component. The scrollbar

is displayed also on pop-up components.</p>

<fig id="GUID-BD8A5FCD-048E-41AF-BA17-A38B689141D9">

<title>Scroll pane with scrollbar</title>

<image href="GUID-F8A7F4CB-011C-425D-83B4-13BD67AA21B7_d0e53932_href.png" scale="33" placement="inline"></image>

</fig>

<ul>

<li><p>The placement of the scroll handle on the scrollbar reflects the position

of the focus on the scrolling content.</p></li>

<li><p>The size of the scroll handle reflects the number of displayed items

relative to the total number of items on the scrolled component.</p></li>

<li><p>The scrollbar is displayed even when all items on the component can

be displayed in the same view without scrolling. When this is the case, the

scroll handle is displayed at the maximum size. The only exception is the

Application Shell, where scrollbar is not displayed if all items fit the same

view.</p></li>

</ul>

<section id="GUID-054FE843-7681-40D9-ACA7-47122BC3107B"><title>Scrollbars

in Touch UI</title><p>In touch devices based on the Symbian platform,

scrollbars (vertical and horizontal) have a touch-enabled scroll box. The

hardware keys (Arrow keys) can also be used for scrolling when the scrollbars

are visible. The scrolling movement on the screen is smooth.</p><p>In order

for the scrollbar to be more usable with touch, the actual scrollbar area

is wider than the visible scrollbar. When the user scrolls, the scrollbar

has a related effect to indicate the scrolling. Because the actual area of

scrollbar is wider, the items appearing on that area in scrollable list, grids,

viewers etc. cannot be touch-enabled, e.g. list icons in column D cannot be

tapped.</p></section>

<section id="GUID-87093F25-CFC3-4D71-A5EF-006C6425C65D"><title>Using

scrollbars in C++ applications</title><p>The API to use for creating the scrollbar

component is the Scroller

API.</p><p>To use a scrollbar in your application, first create a scrollbar

frame using the class <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCEikScrollBarFrame.html" format="application/java-archive"><codeph>CEikScrollbarFrame</codeph></xref>. All scrollbar operations are executed via this scrollbar frame.

These operations include creating and destroying the scrollbar, setting its

visibility, and adjusting the scrollbar's model. The scrollbar itself can

be created using the method <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCEikScrollBarFrame.html#81980f8db36253fc89fb7ebbfa316b4d" format="application/java-archive"><codeph>CreateDoubleSpanScrollBarsL()</codeph></xref> in the class <codeph>CEikScrollBarFrame</codeph>.

The class for the scrollbar is <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknDoubleSpanScrollBar.html" format="application/java-archive"><codeph>CAknDoubleSpanScrollBar</codeph></xref>. For implementation information, see Creating

a scrollbar.</p><p>Scrollbar models encapsulate the range of integers

which a scrollbar can represent, from zero to n, and the current position

of the scrollbar thumb within that range. To set the scrollbar model, use

the class <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classTAknDoubleSpanScrollBarModel.html" format="application/java-archive"><codeph>TAknDoubleSpanScrollbarModel</codeph></xref>. For information on updating the scrollbar's position and size using

the scrollbar model, see Updating

ArrowHead scrollbar attributes and Updating

DoubleSpan scrollbar attributes.</p><p>You can control the scrollbar

visibility using the method <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCEikScrollBarFrame.html#63d2cba6f1261f9c56dd7a98499fceda" format="application/java-archive"><codeph>SetScrollbarVisibilityL()</codeph></xref> in the class <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCEikScrollBarFrame.html" format="application/java-archive"><codeph>CEikScrollbarFrame</codeph></xref>.</p><p>To observed scrollbar events,

use the class <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classMEikScrollBarObserver.html" format="application/java-archive"><codeph>MEikScrollbarObserver</codeph></xref>. For implementation information, see Observing

scrollbar events.</p></section>

</conbody></concept>