author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Mon, 19 Apr 2010 14:01:53 +0300 | |
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/* |
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* Copyright (c) 2006-2007 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: ?Description |
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* |
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*/ |
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#ifndef IRCHANGEOBSERVER_H |
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#define IRCHANGEOBSERVER_H |
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#include <e32base.h> |
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#include <e32property.h> |
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/** |
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* MIRChangeObserver |
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* Abstract interface for handling property change events. |
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*/ |
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class MIRChangeObserver |
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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 value of type int is changed. |
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* @param aCategory UID of Publish And Subscribe category |
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* @param aKey subkey to specify the category event; to be used with Publish And Subscribe |
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* @param aValue the new value |
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*/ |
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virtual void HandleChangeL(const TUid& aCategory, const TUint aKey, |
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const TInt aValue) = 0; |
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}; |
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// CLASS DECLARATION |
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|
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/** |
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* CIRObserver Observer class that observes changes of Property values and propogates them further. |
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* The class defines a handle to a property, a single data value representing |
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* an item of state information. |
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* |
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* @Code |
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* |
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* Updates an int value reference in correspondence |
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* with the current Property value |
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* CIRObserver::GetValue(TInt& aValue) |
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* |
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* @endcode |
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*/ |
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class CIRObserver:public CActive |
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{ |
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public: |
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/** |
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* Two-phased constructor. |
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* @param aObserver a reference to the observer interface implementer |
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* @param aCategory UID of Publish And Subscribe category |
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* @param aKey subkey to specify the category event; to be used with Publish And Subscribe |
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* @param aPropertyType property type to observe |
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*/ |
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static CIRObserver* NewL(MIRChangeObserver& aObserver,const TUid& aCategory, |
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const TUint aKey,const RProperty::TType aPropertyType); |
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/** |
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* Destructor. |
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*/ |
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~CIRObserver(); |
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/** |
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* Updates an int value reference in correspondence with the current Property value |
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* @param aValue handle to a value which will be updated |
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*/ |
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void GetValue(TInt& aValue) const; |
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protected: // Functions from base classes |
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/** |
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* From CActive |
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* Handles an active object’s request completion event |
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*/ |
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void RunL(); |
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/** |
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* From CActive, |
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* Cancels and outstanding request |
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*/ |
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void DoCancel(); |
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private: |
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/** |
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* C++ default constructor. |
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* @param aObserver a reference to the observer interface implementer |
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* @param aCategory UID of Publish And Subscribe category |
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* @param aKey subkey to specify the category event; to be used with Publish And Subscribe |
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* @param aPropertyType property type to observe |
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**/ |
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CIRObserver(MIRChangeObserver& aObserver, const TUid& aCategory, |
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const TUint aKey, const RProperty::TType aPropertyType); |
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/** |
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* default Symbian 2nd phase constructor. |
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*/ |
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void ConstructL(); |
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private: |
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//Value of a subscribed category property of type int. |
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TInt iValueInt; |
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// handle to Publish And Subscribe component |
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RProperty iProperty; |
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MIRChangeObserver& iObserver; |
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// UID of Publish And Subscribe category |
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TUid iCategory; |
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// subkey to be used with Publish And Subscribe |
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TUint iKey; |
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//Type of the observed property. |
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RProperty::TType iPropertyType; |
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}; |
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#endif // IRCHANGEOBSERVER_H |