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<concept id="GUID-62DF565C-8121-429F-99D0-B5FBDE634AA9" xml:lang="en"><title>Using

long-tap events</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>Long-tap events allow you to specify functions performed when the user

taps and holds the button for a specified period of time. An example of a

long-tap function is fast forwarding in a media player application by tapping

and holding down a button.</p>

<p>To receive long-tap events, use the class <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknLongTapDetector.html" format="application/java-archive"><codeph>CAknLongTapDetector</codeph></xref> in the <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/Touch_UI_Utilities_APIIndexPage.html" format="application/java-archive">Touch

UI utilities API</xref>.</p>

<p>To enable the handling of long tap events in your <codeph>CAknButton</codeph> ,

set the flag <codeph>KAknButtonReportOnLongPress</codeph> for the button.

When the long tap event starts,<codeph> CAknButton::ELongPressEvent</codeph> is

reported to the button observer (<codeph>MCoeControlObserver</codeph>). When

the long tap event ends, <codeph>CAknButton::ELongPressEndedEvent</codeph> is

reported.</p>

<p>To define the period for which the button needs to be held down for a long-tap

event, use the method <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknButton.html#5b5323936073f454e96847337131030a" format="application/java-archive"><codeph>SetLongPressInterval()</codeph></xref> in the class <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknButton.html" format="application/java-archive"><codeph>CAknButton</codeph></xref>.</p>

<codeblock xml:space="preserve">void CMyAppContainer::ConstructL() 

{ 

… 

iButton = CAknButton::NewL( NULL, NULL, NULL, NULL, 

KNullDesC, KNullDesC , KAknButtonReportOnLongPress, 0 ); 

iButton->SetContainerWindowL( *this ); 

iButton->SetObserver( this ); 

… 

} 

void CMyAppContainer::HandleControlEventL( CCoeControl* aControl, 

                                                  TCoeEvent aEventType ) 

    { 

        switch ( aEventType ) 

            { 

// Button is pressed for a long time 

            case CAknButton::ELongPressEvent: 

                        if ( aControl == iButton ) 

{ 

                        … 

} 

                break; 

// Button long press ended 

            case CAknButton::ELongPressEndedEvent: 

                        if ( aControl == iButton ) 

{ 

                        … 

} 

                break; 

            default: 

                break; 

            } 

    } 

</codeblock>

</conbody></concept>