calendarui/inc/PropertyObserver.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 15 Jul 2010 18:37:27 +0300
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/*
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* Copyright (c) 2002, 2003 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: Property Observer class for handling property change events.
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 *
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*/
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#ifndef CPROPERTYOBSERVER_H
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#define CPROPERTYOBSERVER_H
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// INCLUDES
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#include <e32base.h>
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#include <e32property.h>
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// CLASS DECLARATION
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/**
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 * MPropertyChangeHandler.
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 * Abstract interface for handling property change events.
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 **/
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NONSHARABLE_CLASS( MPropertyChangeHandler )
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{
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 public:
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    /**
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     * This is a callback function which is called when a property is changed.
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     *
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     * @param aCategory  UID of the category.
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     * @param aKey       changed key
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     * @param aValue     the new value
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     *
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     * Note! references aKey and aValue are only valid while executing
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     * HandlePropertyChange(). After that the data in which they refer can change.
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     **/
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    virtual void HandlePropertyChange(const TUid& aCategory, const TUint& aKey, const TInt& aValue) = 0;
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};
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// CLASS DECLARATION
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/**
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 * ?one_line_short_description.
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 * ?other_description_lines
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 *
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 * @since Series 60 3.0
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 **/
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NONSHARABLE_CLASS(CPropertyObserver) : public CActive
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{
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 public:  // Constructors and destructor
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    /**
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     * Two-phased constructor.
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     * @since Series 60 3.0
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     * @param ?arg1 ?description
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     * @param ?arg2 ?description
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     **/
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    static CPropertyObserver* NewL(MPropertyChangeHandler& aHandler, const TUid& aCategory, const TUint& aKey, const TBool aSkipValue=EFalse)
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    {
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        CPropertyObserver* self = new( ELeave )CPropertyObserver( aHandler, aCategory, aKey, aSkipValue );
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        CleanupStack::PushL( self );
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        self->ConstructL();
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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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     * Destructor.
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     **/
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    ~CPropertyObserver()
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    {
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        Deque();
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        iProperty.Cancel();
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        iProperty.Close();
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    };
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 private:
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    /**
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     * C++ default constructor overload.
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     **/
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    CPropertyObserver(MPropertyChangeHandler& aHandler, const TUid& aCategory, const TUint& aKey, const TBool aSkipValue)
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    : CActive( CActive::EPriorityStandard ),
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      iCategory( aCategory ),
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      iKey( aKey ),
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      iHandler( aHandler ),
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      iSkipValue( aSkipValue )
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    {
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    };
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    /**
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     * By default Symbian 2nd phase constructor is private.
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     **/
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    void ConstructL(void)
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    {
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        CActiveScheduler::Add( this );
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        User::LeaveIfError( iProperty.Attach( iCategory, iKey ) );
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        //NotifyCurrentValue(); // notify initial value
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        // Start observing...
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        Subscribe();
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    };
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 protected:  // Functions from base classes
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    /**
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     * From CActive ?member_description
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     **/
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    inline void RunL(void);
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    /**
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     * From CActive ?member_description
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     **/
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    inline void DoCancel(void);
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 private:  // New functions
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    /**
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     * ?member_description.
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     * @since Series 60 3.0
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     **/
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    inline void Subscribe(void);
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    /**
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     * ?member_description.
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     * @since Series 60 3.0
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     **/
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    inline void NotifyCurrentValue(void);
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 private:  // Data
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    // ?one_line_short_description_of_data
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    RProperty iProperty;
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    // ?one_line_short_description_of_data
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    const TUid iCategory;
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    // ?one_line_short_description_of_data
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    const TUint iKey;
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    // ?one_line_short_description_of_data
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    MPropertyChangeHandler& iHandler;
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    // ?one_line_short_description_of_data
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    const TBool iSkipValue;
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};
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#include "PropertyObserver.inl"
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#endif  // CPROPERTYOBSERVER_H
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// End of File