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    10 <!DOCTYPE concept

    11   PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

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

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

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

    15 Edition introduced new observer interfaces to the existing components. These

    16 are:</p>

    17 <ul>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    34 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>

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

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

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

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

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

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

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

    42 </ul>

    43 </conbody></concept>