Archived:Applying actions on list box items using Symbian C++

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Latest revision as of 08:34, 18 September 2012

Archived: This article is archived because it is not considered relevant for third-party developers creating commercial solutions today. If you think this article is still relevant, let us know by adding the template {{ReviewForRemovalFromArchive|user=~~~~|write your reason here}}.

Article Metadata

Compatibility

Platform(s): S60 1st Edition
S60 2nd Edition and FP1, FP2, FP3
S60 3rd Edition and FP1

Article

Created: User:Technical writer 2 (10 May 2007)

Last edited: hamishwillee (18 Sep 2012)

Overview

Applying actions on list box items

Description

Below is a code snippet demonstrating how to apply actions on a list box item selected by the user.

The code to create a simple list box can be obtained from the link: How to create a simple listbox in Symbian C++. It is possible to apply any actions (e.g., displaying a popup or a dialog) by catching key events for a list box that currently has keyboard focus. This is done in the OfferKeyEventL() function of the container class that owns the list box.

Solution

TKeyResponse CMyExampleAppView::OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode aType)
{
        if(aType != EEventKey)
            {
            return EKeyWasNotConsumed;
            }
        switch(aKeyEvent.iCode)
            {
            case EKeyUpArrow:
            case EKeyDownArrow:
                {
                // Forward up and down key press events to the list box
                return iListBox->OfferKeyEventL( aKeyEvent, aType );
                }
            case EKeyOK: // display an information note when item is selected
                {
                _LIT(KFormatMessage, "Selected item: %d");
                TInt idx = iListBox->CurrentItemIndex();
                TBuf<32> message;
                message.Format(KFormatMessage, idx);
                CAknInformationNote* Note = new (ELeave) CAknInformationNote;
                Note->ExecuteLD(message); 
                return EKeyWasConsumed;
                }
            default:
                break;
            }
        return EKeyWasNotConsumed;
        }

Also make sure to add this line

AddToStackL( iAppView );

in AppUi's ConstructL() to add the view/container to the control stack and receive OfferKeyEventL() calls.

@@ Line 1: / Line 1: @@
-{{KBTS}}
+{{Archived|timestamp=20120314051316|user=roy.debjit| }}
-__NOTOC__
+[[Category:Symbian C++]][[Category:UI]][[Category:S60 1st Edition]][[Category:S60 2nd Edition (initial release)]][[Category:S60 3rd Edition (initial release)]][[Category:S60 3rd Edition FP1]]
-__NOEDITSECTION__
+ {{ArticleMetaData <!-- v1.2 -->
-[[Category:Technical Solution]]
-{{ArticleMetaData
-|id=TSS000647
-|platform=S60 1st Edition<br>S60 2nd Edition and FP1, FP2, FP3<br>S60 3rd Edition and FP1
-|devices=
-|category=Symbian C<nowiki>++</nowiki>
-|subcategory=UI, UI components
-|creationdate=May 10, 2007
-|keywords=
 |sourcecode= <!-- Link to example source code (e.g. [[Media:The Code Example ZIP.zip]]) -->
 |installfile= <!-- Link to installation file (e.g. [[Media:The Installation File.sis]]) -->
-|sdk=<!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
+|devices= <!-- Devices tested against - e.g. ''devices=Nokia 6131 NFC, Nokia C7-00'') -->
-|devicecompatability=<!-- Compatible devices (e.g.: All* (must have GPS) ) -->
+|sdk= <!-- SDK(s) built and tested against (e.g. [http://linktosdkdownload/ Nokia Qt SDK 1.1]) -->
-|signing=<!-- Empty or one of Self-Signed, DevCert, Manufacturer -->
+|platform= S60 1st Edition<br>S60 2nd Edition and FP1, FP2, FP3<br>S60 3rd Edition and FP1
-|capabilities=<!-- Capabilities required (e.g. Location, NetworkServices.) -->
+|devicecompatability= <!-- Compatible devices (e.g.: All* (must have GPS) ) -->
-|author=[[User:Technical writer 2]]
+|dependencies= <!-- Any other/external dependencies e.g.: Google Maps Api v1.0 -->
+|signing= <!-- Empty or one of Self-Signed, DevCert, Manufacturer -->
+|capabilities= <!-- Capabilities required by the article/code example (e.g. Location, NetworkServices. -->
+|keywords= <!-- APIs, classes and methods (e.g. QSystemScreenSaver, QList, CBase -->
+|language= <!-- Language category code for non-English topics - e.g. Lang-Chinese -->
+|translated-by= <!-- [[User:XXXX]] -->
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+|translated-from-id= <!-- Id of translated revision -->
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+|review-timestamp= <!-- After re-review: YYYYMMDD -->
+|update-by= <!-- After significant update: [[User:username]]-->
+|update-timestamp= <!-- After significant update: YYYYMMDD -->
+|creationdate= 20070510
+|author= [[User:Technical writer 2]]
+<!-- The following are not in current metadata -->
+|id= TSS000647
 }}
@@ Line 27: / Line 30: @@
 == Description ==
-Below is a code snippet demonstrating how to apply actions on a list box item selected by the user.<br>The code to create a simple list box can be obtained from the link below:<br>[[How to create a simple listbox<br>It]] is possible to apply any actions (e.g., displaying a popup or a dialog) by catching key events for a list box that currently has keyboard focus. This is done in the OfferKeyEventL() function of the container class that owns the list box.
+Below is a code snippet demonstrating how to apply actions on a list box item selected by the user.
+The code to create a simple list box can be obtained from the link: [[How to create a simple listbox in Symbian C++]]. It is possible to apply any actions (e.g., displaying a popup or a dialog) by catching key events for a list box that currently has keyboard focus. This is done in the OfferKeyEventL() function of the container class that owns the list box.
 == Solution ==
-&nbsp;&nbsp;&nbsp;&nbsp;TKeyResponse CMyExampleAppView::OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode aType)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<nowiki>{</nowiki><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if(aType != EEventKey)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<nowiki>{</nowiki><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return EKeyWasNotConsumed;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<nowiki>}</nowiki><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;switch(aKeyEvent.iCode)<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<nowiki>{</nowiki><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case EKeyUpArrow:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case EKeyDownArrow:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<nowiki>{</nowiki><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;// Forward up and down key press events to the list box<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return iListBox-<nowiki>></nowiki>OfferKeyEventL( aKeyEvent, aType );<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<nowiki>}</nowiki><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;case EKeyOK: // display an information note when item is selected<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<nowiki>{</nowiki><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;_LIT(KFormatMessage, "Selected item: %d");<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;TInt idx = iListBox-<nowiki>></nowiki>CurrentItemIndex();<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;TBuf<nowiki><</nowiki>32<nowiki>></nowiki> message;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;message.Format(KFormatMessage, idx);<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;CAknInformationNote* Note = new (ELeave) CAknInformationNote;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Note-<nowiki>></nowiki>ExecuteLD(message);<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return EKeyWasConsumed;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<nowiki>}</nowiki><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;default:<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;break;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<nowiki>}</nowiki><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return EKeyWasNotConsumed;<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<nowiki>}</nowiki><br>Also make sure to add this line<br>&nbsp;&nbsp;&nbsp;&nbsp;AddToStackL( iAppView ); <br>in AppUi<nowiki>’</nowiki>s ConstructL() to add the view/container to the control stack and receive OfferKeyEventL() calls.
+<code cpp>
+TKeyResponse CMyExampleAppView::OfferKeyEventL(const TKeyEvent& aKeyEvent, TEventCode aType)
+{
+        if(aType != EEventKey)
+            {
+            return EKeyWasNotConsumed;
+            }
+        switch(aKeyEvent.iCode)
+            {
+            case EKeyUpArrow:
+            case EKeyDownArrow:
+                {
+                // Forward up and down key press events to the list box
+                return iListBox->OfferKeyEventL( aKeyEvent, aType );
+                }
+            case EKeyOK: // display an information note when item is selected
+                {
+                _LIT(KFormatMessage, "Selected item: %d");
+                TInt idx = iListBox->CurrentItemIndex();
+                TBuf<32> message;
+                message.Format(KFormatMessage, idx);
+                CAknInformationNote* Note = new (ELeave) CAknInformationNote;
+                Note->ExecuteLD(message);
+                return EKeyWasConsumed;
+                }
+            default:
+                break;
+            }
+        return EKeyWasNotConsumed;
+        }
+</code>
-[[Category:Symbian C++]][[Category:UI]][[Category:S60 1st Edition]] [[Category:S60 2nd Edition]] [[Category:S60 3rd Edition]] [[Category:S60 3rd Edition, Feature Pack 1]]
+Also make sure to add this line
+<code cpp>AddToStackL( iAppView );</code>
+in AppUi's {{Icode|ConstructL()}} to add the view/container to the control stack and receive {{Icode|OfferKeyEventL()}} calls.
+<!-- Translation --> [[zh-hans:如何在列表框项中响应动作]]

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