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1 <?xml version="1.0" encoding="utf-8"?> |
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2 <!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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3 <!-- This component and the accompanying materials are made available under the terms of the License |
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4 "Eclipse Public License v1.0" which accompanies this distribution, |
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5 and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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6 <!-- Initial Contributors: |
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7 Nokia Corporation - initial contribution. |
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8 Contributors: |
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9 --> |
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10 <!DOCTYPE concept |
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11 PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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12 <concept id="GUID-62DF565C-8121-429F-99D0-B5FBDE634AA9" xml:lang="en"><title>Using |
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13 long-tap events</title><prolog><metadata><keywords/></metadata></prolog><conbody> |
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14 <p>Long-tap events allow you to specify functions performed when the user |
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15 taps and holds the button for a specified period of time. An example of a |
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16 long-tap function is fast forwarding in a media player application by tapping |
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17 and holding down a button.</p> |
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18 <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="GUID-92018B6B-3CBB-434D-9E61-F271C67E98E3.dita">Touch |
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19 UI utilities API</xref>.</p> |
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20 <p>To enable the handling of long tap events in your <codeph>CAknButton</codeph> , |
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21 set the flag <codeph>KAknButtonReportOnLongPress</codeph> for the button. |
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22 When the long tap event starts,<codeph>CAknButton::ELongPressEvent()</codeph> is |
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23 reported to the button observer (<codeph>MCoeControlObserver</codeph>). When |
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24 the long tap event ends, <codeph>CAknButton::ELongPressEndedEvent()</codeph> is |
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25 reported.</p> |
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26 <p>To define the period for which the button needs to be held down for a long-tap |
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27 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> |
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28 <codeblock xml:space="preserve">void CMyAppContainer::ConstructL() |
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29 { |
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30 … |
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31 iButton = CAknButton::NewL( NULL, NULL, NULL, NULL, |
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32 |
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33 KNullDesC, KNullDesC , KAknButtonReportOnLongPress, 0 ); |
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34 |
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35 iButton->SetContainerWindowL( *this ); |
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36 iButton->SetObserver( this ); |
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37 … |
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38 } |
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39 |
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40 void CMyAppContainer::HandleControlEventL( CCoeControl* aControl, |
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41 TCoeEvent aEventType ) |
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42 { |
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43 switch ( aEventType ) |
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44 { |
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45 |
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46 // Button is pressed for a long time |
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47 |
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48 case CAknButton::ELongPressEvent: |
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49 if ( aControl == iButton ) |
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50 |
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51 { |
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52 |
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53 … |
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54 |
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55 } |
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56 |
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57 break; |
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58 |
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59 // Button long press ended |
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60 |
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61 case CAknButton::ELongPressEndedEvent: |
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62 if ( aControl == iButton ) |
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63 |
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64 { |
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65 |
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66 … |
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67 |
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68 } |
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69 |
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70 break; |
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71 |
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72 default: |
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73 break; |
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74 } |
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75 } |
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76 |
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77 </codeblock> |
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78 </conbody></concept> |