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-->  <!DOCTYPE concept PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"><concept id="GUID-16950F22-F5DE-4D52-8414-544105BA3200" xml:lang="en"><title>Hierarchical

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

<p>The hierarchical list component (a "tree list") is available for use in

dialogs that deal with moving items to and from (or copying them) from one

folder to another. The main use situation for the component is the File Manager

folder and file browsing, when the actual data is being showed in the same

view. The hierarchical list component allows users to browse through their

folder content by having a list and its content available simultaneously:

the user can simply expand a listed item (folder) to show its content.</p>

<p>Unlike the other Symbian list types, the hierarchical list

component is not structured on the A   D column structure. Visually, the hierarchical

levels are connected with vertical lines (see the figure below), and the folders

in each hierarchy level are shown before files on that same level. Scroll

bars function as usual (vertical bar is always present, horizontal bar is

available when necessary), and the list does not loop by default, although

it is possible to enable looping. Marquee scrolling is supported, but if not

used, the names of folders and files are truncated where necessary. The height

and the vertical distribution of the folder/file texts on the list is the

same as in normal lists. Hierarchical lists can be used both in the main pane

and as pop-ups.</p>

<fig id="GUID-5CC170B7-72AA-422E-8C44-AFB135C596D6">

<title>Hierarchical list component</title>

<image href="GUID-341CE215-056C-45B6-ABE2-C75442605147_d0e80725_href.png" scale="40" placement="inline"></image>

</fig>

<p>Owing to the need for horizontal scrolling, it is not possible to use tabs

in the Navi pane. Typically the hierarchical list component is capable of

showing three hierarchy levels in portrait orientation, but this may vary

according to the display sizes and resolutions as well as the display orientation.

The order of folders (sorting order) on each level is defined by the application.</p>

<p><b>General navigation:</b></p>

<ul>

<li><p>Arrow keys either expand collapsed folders (Arrow right, the focus

does not move yet), collapse expanded folders (Arrow left: one press to move

the focus onto the parent folder when there is one, second press to collapse

the contents), or move the focus into the direction of scrolling. </p></li>

<li><p>The Selection key expands collapsed (or vice versa) folders or opens

files under focus. </p></li>

<li><p>Commands for expanding, collapsing and opening folders or files are

also available in the <b>Options</b> menu.</p></li>

</ul>

<section id="GUID-E507585F-2B77-49BC-B982-76E143E7BF2A"><title>Using

hierarchical lists in C++ applications</title><p>The API to use for hierarchical

lists is the Hierarchical

lists API. For implementation information, see Using

the Hierarchical lists API.</p></section>

</conbody></concept>