bluetoothengine/btui/devmodel/inc/btregistryobserver.h
author hgs
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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:  Registry observer is listening to registry changes and
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* 				  and reporting the changed devices to the listener.
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*
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*/
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#ifndef BTREGISTRYOBSERVER_H
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#define BTREGISTRYOBSERVER_H
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#include <e32base.h>
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#include <e32property.h>
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#include <btmanclient.h>
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#include <btengdevman.h> 
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/** This class will inform the listener about the new BTregistry status
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*after registry change events. 
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*
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* This class will listen to events about registry changes and inform
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* the listener about the latest registry status. The listener can
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* also ask the status using refresh. This is usefull for for
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* for example retrieval of initial lists of devices. 
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*
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*@lib btdevmodel.dll
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*@since S60 V3.2
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*/
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NONSHARABLE_CLASS(MBTRegistryObserver)
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    {
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public:
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	/** The aDeviceArray constents are deleted after this
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	* call returns. If storage is wanted the array and its contents
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	* must be copied by implementor.
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	*/
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    virtual void RegistryChangedL(const CBTDeviceArray* aDeviceArray) = 0;
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    };
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NONSHARABLE_CLASS(CBTRegistryObserver) : public CActive, public MBTEngDevManObserver
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    {
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public: 
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	/** NewL
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	 *@param aObserver The class that is listening to registry changes
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	 *@param aPattern The pattern to be used to retrieve the changed objects.
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	 */
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    static CBTRegistryObserver* NewL(MBTRegistryObserver* aObserver, 
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        const TBTRegistrySearch aPattern);
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    /** Destructor*/
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    virtual ~CBTRegistryObserver();       
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	/** Start listening to registry changes. 
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	 *
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	 *Calling this while registry observer is running is silently ignored.
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	 */
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    void StartIfNotRunning();
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    /* Registry observer will retrieve list of devices in the backround 
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     * and send it to the listener, when one is retrieved.
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     */
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    void Refresh();
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    /** Check if this is running.       
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     *@return ETrue if not listening to registry changes.
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     */
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    inline TBool IsStopped() {return iIsStopped;}
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    /** This will stop listening and cancel any retrieval of devicelists,
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    * if any.
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    * @param none.
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    * @return none.
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    */
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    void Cancel();    
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private:
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	/* Constructor that may not leave.
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	 *@param aObserver The class that is listening to registry changes
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	 *@param aPattern The pattern to be used to retrieve the changed objects.
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	 */
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    CBTRegistryObserver(MBTRegistryObserver* aObserver, const TBTRegistrySearch aPattern);
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	/** 2nd phase constructor. Called by NewL only.
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    * @param none.
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    * @return none.	
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	 */
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    void ConstructL();
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	/** This is called when registry changes occur, but not when deviceLists are
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	* retrieved, since HandleGetDevicesComplete is called then. 
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	*
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	* If one or more registry events occur during devicelist retrieval, there
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	* will be one new devicelist retrieval after the current retrieval is done.
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	*
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    * @param none.
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    * @return none.
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	*/
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    void RunL();
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    /** This will clear iRegDeviceArray and delete its contents.
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    * @param none.
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    * @return none.     
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    */
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    void DeleteAllocatedDevices();
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    /** This will cancel listening. To be called by Cancel only.
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     * @param none.
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     * @return none.
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	 */
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    void DoCancel();    
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	/** This is called when devicelist have been read from BtDevMan 
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	* @param aErr KErrNone or the accurred error.
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	* @param aDeviceArray the devices that have been retrieved.
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    * @return none.
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    */
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    void HandleGetDevicesComplete(TInt aErr, CBTDeviceArray* aDeviceArray);
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private:
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    MBTRegistryObserver* iObserver; // the class listening to this class
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    CBTDeviceArray* iRegDeviceArray;  // this is used for retrieving devices
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    TBTRegistrySearch iSearchPattern; // the search used to retrieve devices
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    								 // NOTE: this class does not filter the results,
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    								 // but the one listening to this (if filtering is done).
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    RProperty iProperty;
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    CBTEngDevMan* iDevMan;			// the object that is used to retrieve the device lists.
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    TBool iIsStopped;				// is this runining.
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    TBool iAnotherEventPending;		// Has there been one or more changes during this retrieval.
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    								// if this is true then HandleGetDevices will start a new search.
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    };
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#endif