Creating a radio button settings page using Symbian C++

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Article Metadata

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Tested with

Devices(s): Nokia 6220 Classic

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Compatibility

Platform(s): S60 3rd Edition

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Article

Keywords: CAknRadioButtonSettingPage, MAknSettingPageObserver, CAknRadioButtonSettingPage::SetSettingPageObserver(), CAknRadioButtonSettingPage::ExecuteLD(), MAknSettingPageObserver::HandleSettingPageEventL()

Created: aknyman (25 Sep 2008)

Last edited: hamishwillee (14 Jun 2012)

Overview

This code snippet shows how to create a radio button settings page using the class CAknRadioButtonSettingPage. After implementing the interface MAknSettingPageObserver, the UI class will be able to capture events of type TAknSettingPageEvent.

This snippet can be self-signed.

Resource file (.rss)

#include <eikon.rh>
#include <avkon.rsg>
#include <avkon.rh>
 
//...
 
RESOURCE AVKON_SETTING_PAGE r_example_setting_page
    {
    label = "Title";
    type = EAknCtPopupSettingList;
    editor_resource_id = r_example_setting_list;
    }
 
 
RESOURCE POPUP_SETTING_LIST r_example_setting_list
    {
    flags = 0;
    }
 
RESOURCE ARRAY r_example_options
    {
    items =
        {
        LBUF { txt = "option0";},
        LBUF { txt = "option1";},
        LBUF { txt = "option2";}
        };
    }

MMP file

The following libraries are required:

LIBRARY avkon.lib   
LIBRARY eikctl.lib 
LIBRARY eikcoctl.lib  
LIBRARY bafl.lib

Header file

#ifndef __EXAMPLEAPPUI_H__
#define __EXAMPLEAPPUI_H__
 
// INCLUDES
#include <aknappui.h>
#include <AknSettingPage.h> //For CAknSettingPage, TAknSettingPageEvent
#include <eiklbx.h>         //For CEikListBox
#include <badesca.h>        //For CDesCArrayFlat
#include <aknradiobuttonsettingpage.h> //For CAknRadioButtonSettingPage
 
// CLASS DECLARATION
// CExampleAppUi application UI class.
 
class CExampleAppUi : public CAknAppUi, public MAknSettingPageObserver
    {
    //...
public: //From MAknSettingPageObserver
    void HandleSettingPageEventL(CAknSettingPage* aSettingPage, 
                         TAknSettingPageEvent aEventType);
 
//...
private:
    void ShowRadioButtonSettingPageL();
    void ShowDynamicRadioButtonSettingPageL();
    CDesCArrayFlat* CreateRadionButtonOptionsLC();
//...
private:
    //data
    TInt iSelection;
    };
 
 
#endif //__EXAMPLEAPPUI_H__

Source file

#include "ExampleAppUi.h"
//...
 
void CExampleAppUi::ShowRadioButtonSettingPageL()
    {
    CDesCArrayFlat *array = CEikonEnv::Static()->
        ReadDesCArrayResourceL(R_EXAMPLE_OPTIONS);
    CleanupStack::PushL(array);
 
    CAknRadioButtonSettingPage* dialog =
    new (ELeave) CAknRadioButtonSettingPage(R_EXAMPLE_SETTING_PAGE,
            iSelection, array);
    CleanupStack::PushL(dialog);
    dialog->ConstructL();
    CleanupStack::Pop();//dialog
    dialog->SetSettingPageObserver(this);
    //ExecuteLD() enumeration controls how often the setting page updates the 
    //externally held client object (EUpdateWhenChanged, EUpdateWhenAccepted)   
    dialog->ExecuteLD(CAknSettingPage::EUpdateWhenChanged);
 
    CleanupStack::PopAndDestroy(); //array
    }
 
void CExampleAppUi::ShowDynamicRadioButtonSettingPageL()
    {
    CDesCArrayFlat *array = CreateRadionButtonOptionsLC();
 
    CAknRadioButtonSettingPage* dialog =
    new (ELeave) CAknRadioButtonSettingPage(R_EXAMPLE_SETTING_PAGE,
            iSelection, array);
    CleanupStack::PushL(dialog);
    dialog->ConstructL();
    CleanupStack::Pop();//dialog
    dialog->SetSettingPageObserver(this);
    dialog->ExecuteLD(CAknSettingPage::EUpdateWhenChanged);
 
    CleanupStack::PopAndDestroy(); //array
    }
 
CDesCArrayFlat* CExampleAppUi::CreateRadionButtonOptionsLC()
    {
    TInt itemCount = 3;
    CDesCArrayFlat* array = new (ELeave) CDesCArrayFlat(itemCount);
    CleanupStack::PushL(array);
 
    array->AppendL(_L("option0"));
    array->AppendL(_L("option1"));
    array->AppendL(_L("option2"));
 
    return array;
    }
 
// Handles an event of type aEventType reported by the Setting Page to this observer.
void CExampleAppUi::HandleSettingPageEventL(CAknSettingPage* aSettingPage,
    TAknSettingPageEvent aEventType)
    {
    if (aEventType == EEventSettingOked)
        {
        CEikListBox* listBox = (CEikListBox*) aSettingPage->EditorControl();
        TInt selection = listBox->CurrentItemIndex();
        //do something...
        }
    else if (aEventType == EEventSettingChanged)
        {
        //do something...
        }
    else if (aEventType == EEventSettingCancelled)
        {
        //do something...
        }
    else
        {
        //unknown type, do something...
        }
    }

Postconditions

The radio button setting page has been shown and the events (ok, cancel, change) have been captured.