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<concept id="GUID-0C19D3F1-CF60-4760-8A77-242E14647738" xml:lang="en"><title>Touch

UI observer interfaces</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>To support the touch functionality in existing UI components too, S60 5th

Edition introduced new observer interfaces to the existing components. These

are:</p>

<ul>

<li><p><i>Navigation decorator observer</i></p><p>The navigation decorator

observer interface is used in the navigation pane. The interface receives

an event indicating that the decorator’s right or left arrow has been tapped

(or the navi label), and then the observer implementation can perform an action

(for example, raise the volume or change focus to the next tab). This might

be useful if you implement custom controls to be included in the navigation

control.</p><p>It is defined by <codeph>MAknNaviDecoratorObserver</codeph>.

The observer can be set by <codeph>CAknNavigationDecorator::SetNaviDecoratorObserver</codeph>.</p> </li>

<li><p><i>Long tap detector</i></p><p>The long tap detector (<codeph>CAknLongTapDetector</codeph>)

is an Avkon component that an application or control can use to receive long

tap events.</p><p>The long tap handler must inherit from <codeph>MAknLongTapDetectorCallBack</codeph> and

implement the <codeph>HandleLongTapEventL</codeph> call back function for

long tap events.</p> <p>When the stylus is held down in the same position,

an animation starts in about 0.15 s to show that the long tap functionality

has started. Animation is provided by AVKON and cannot be changed by the application

or control. However, animation can be turned off using the class <codeph>CAknLongTapDetector</codeph> in

the Touch UI utilities API.</p> <p>For implementation infomation, see the <xref href="GUID-92018B6B-3CBB-434D-9E61-F271C67E98E3.dita">Touch UI utilities API specification</xref>.</p></li>

<li><p><i>Double-click support in lists</i></p><p>In order to receive double-click

events from a list or grid, the object that wishes to be informed must implement

and register the <codeph>MEikListBoxObserver</codeph> interface via <codeph>CEikListBox::SetListBoxObserver</codeph>. </p></li>

<li><p><i>Title pane touch observer</i></p><p>The title pane touch observer

enables you to provide functionality for title pane touch events. For implementation

information, see the <xref href="GUID-B876D548-FD40-4369-B328-7427002B4851.dita">Title

pane touch observer API specification</xref>.</p></li>

</ul>

</conbody></concept>