<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

<!-- This component and the accompanying materials are made available under the terms of the License 

"Eclipse Public License v1.0" which accompanies this distribution, 

and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->

<!-- Initial Contributors:

    Nokia Corporation - initial contribution.

Contributors: 

-->

<!DOCTYPE concept

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

<concept id="GUID-07DD47FD-86B7-4AFD-BEDB-DF6EA12DFC6C" xml:lang="en"><title>Using

button states</title><prolog><metadata><keywords/></metadata></prolog><conbody>

<p>The states can also be added to button dynamically. To add button states

as required, use the method <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknButton.html#656fd550a246e6c2b77bf96939dad6d2" format="application/java-archive"><codeph>AddStateL()</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">// Add state with button text and help text 

HBufC* stateText = StringLoader::LoadLC( R_MYAPP_BUTTON_TEXT );    

HBufC* stateHelpText = StringLoader::LoadLC( R_MYAPP_BUTTON_TEXT ); 

button->AddStateL( 0, 0, 0, 0, *stateText, *stateHelpText, 0 ); 

CleanupStack::PopAndDestroy( 2 ); // stateText, stateHelpText 

// Add state with icon 

… 

#include <avkon.mbg> 

… 

TPtrC8 pathPtr( ( TUint8* ) AVKON_BITMAP_FILE ); 

HBufC *filePath = HBufC::NewLC( pathPtr.Length() ); 

filePath->Des().Copy( pathPtr ); 

button->AddStateL( *filePath, 

                   EMbmAvkonQgn_indi_volume_arrow_down, 

                   EMbmAvkonQgn_indi_volume_arrow_down_mask, 

                   0, 0, 

                   EMbmAvkonQgn_indi_volume_arrow_down, 

                   EMbmAvkonQgn_indi_volume_arrow_down_mask, 

                   0, 0, 

                   KNullDesC, KNullDesC, 0, 

                   KAknsIIDQgnIndiVolumeArrowDown, 

                   KAknsIIDQgnIndiVolumeArrowDownInactive, 

                   KAknsIIDQgnIndiVolumeArrowDownSelected, 

                   KAknsIIDDefault ); 

CleanupStack::PopAndDestroy( filePath ); 

</codeblock>

<p>The following sample code defines three different kinds of buttons with

button states in a resource file.</p>

<codeblock xml:space="preserve">#include &lt;avkon.mbg&gt; 

#include <aknsconstants.hrh> 

… 

RESOURCE AVKON_BUTTON r_myapp_command_button 

    { 

    flags  = 0; 

    states = 

        { 

        AVKON_BUTTON_STATE 

            { 

            bmpfile = AVKON_BITMAP_FILE; 

            bmpid = EMbmAvkonQgn_indi_volume_arrow_down; 

            bmpmask = EMbmAvkonQgn_indi_volume_arrow_down_mask; 

            press_bmpid = EMbmAvkonQgn_indi_volume_arrow_down; 

            press_bmpmask = EMbmAvkonQgn_indi_volume_arrow_down_mask; 

            helptxt = "Volume down"; 

            // Skinning support for state icon 

            extension = r_myapp_command_button_extension; 

            } 

        }; 

    } 

RESOURCE AVKON_BUTTON_STATE_EXTENSION r_myapp_command_button_extension 

    { 

    bmbSkinIdMajor = EAknsMajorGeneric; 

    bmbSkinIdMinor = EAknsMinorGenericQgnIndiVolumeArrowDown; 

    } 

RESOURCE AVKON_BUTTON r_myapp_onoff_button 

    { 

    flags  = 0; 

    states = 

        { 

        AVKON_BUTTON_STATE 

            { 

            txt = "Off"; 

            helptxt = "Turn on"; 

            }, 

            AVKON_BUTTON_STATE 

            { 

            flags = KAknButtonStateHasLatchedFrame; 

            txt = "On"; 

            helptxt = "Turn off"; 

            } 

        }; 

    } 

RESOURCE AVKON_BUTTON r_myapp_mode_button 

    { 

    flags  = 0; 

    states = 

        { 

        AVKON_BUTTON_STATE 

            { 

            txt = "Mode 1"; 

            helptxt = "Switch to 2"; 

            }, 

        AVKON_BUTTON_STATE 

            { 

            txt = "Mode 2"; 

            helptxt = "Switch to 3"; 

            }, 

        AVKON_BUTTON_STATE 

            { 

            txt = "Mode 3"; 

            helptxt = "Switch to 1"; 

            } 

        }; 

    } 

</codeblock>

<p>To set current state for the button, use the method <xref href="jar:GUID-759FBC7F-5384-4487-8457-A8D4B76F6AA6.jar!/html/classCAknButton.html#19d9e952ed9002fcb6fc3f15dfe5583a" format="application/java-archive"><codeph>SetCurrentState()</codeph></xref> in the class <codeph>CAknButton</codeph>.

To get a pointer to the current state of the button, use <codeph>State()</codeph> method.

The index of the current state can be acquired with the method <codeph>CAknButton::StateIndex()</codeph>.</p>

<codeblock xml:space="preserve">if ( button-&gt;StateIndex() == 0 ) 

{ 

      button->SetCurrentState( 1, ETrue ); 

}</codeblock>

</conbody></concept>