idlehomescreen/xmluirendering/uiengine/src/xnpropertysubscriber.cpp
author Simon Howkins <simonh@symbian.org>
Tue, 16 Nov 2010 11:12:20 +0000
branchRCL_3
changeset 108 cf9be2d674f1
parent 83 5456b4e8b3a8
permissions -rw-r--r--
Fixed path to files to be exported
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/*
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* Copyright (c) 2008 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Subscribes properties from P&S
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*
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*/
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#include "xnpropertysubscriber.h"
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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//
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CXnPropertySubscriber::CXnPropertySubscriber(
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    MXnPropertyChangeObserver& aObserver,
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    const TUint32 aKey )
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    : CActive( EPriorityStandard ),
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    iPropertyChangeObserver( aObserver ),
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    iKey( aKey )
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    {
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    }
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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//
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CXnPropertySubscriber* CXnPropertySubscriber::NewLC(
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    const TUid aUid,
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    const TUint32 aKey,
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    MXnPropertyChangeObserver& aObserver )
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    {
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    CXnPropertySubscriber* self =
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        new ( ELeave ) CXnPropertySubscriber( aObserver, aKey );
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    CleanupStack::PushL( self );
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    self->ConstructL( aUid, aKey );
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    return self;
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    }
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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//
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CXnPropertySubscriber* CXnPropertySubscriber::NewL(
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    const TUid aUid,
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    const TUint32 aKey,
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    MXnPropertyChangeObserver& aObserver )
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    {
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    CXnPropertySubscriber* self = CXnPropertySubscriber::NewLC(
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        aUid, aKey, aObserver );
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    CleanupStack::Pop(); // self;
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    return self;
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    }
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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//
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void CXnPropertySubscriber::ConstructL(
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    const TUid aUid,
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    const TUint32 aKey )
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    {
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    User::LeaveIfError( iProperty.Attach( aUid, aKey ) );
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    CActiveScheduler::Add( this ); // Add to scheduler
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    // initial subscription and process current property value
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    RunL();
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    }
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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//
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CXnPropertySubscriber::~CXnPropertySubscriber()
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    {
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    Cancel(); // Cancel any request, if outstanding
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    iProperty.Close();
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    }
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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//
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void CXnPropertySubscriber::DoCancel()
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    {
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    iProperty.Cancel();
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    }
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// -----------------------------------------------------------------------------
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// -----------------------------------------------------------------------------
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//
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void CXnPropertySubscriber::RunL()
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    {
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    // resubscribe before processing new value to prevent missing updates
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    iProperty.Subscribe( iStatus );
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    SetActive();
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    TInt intValue;
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    if ( iProperty.Get( intValue ) != KErrNotFound )
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        {
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        iPropertyChangeObserver.PropertyChangedL( iKey, intValue );
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        }
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    }
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// ---------------------------------------------------------
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// ---------------------------------------------------------
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//
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TInt CXnPropertySubscriber::RunError(TInt /*aError*/)
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    {   
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    return KErrNone;
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    }
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// End of file
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