Implement the observer functions

Context

An application can register as an observer of a view by implementing the following observer interfaces. Observers can register with the View Server as activation observers, deactivation observers or as generic observers.

Interface

Notification

Method to override

MCoeViewActivationObserver

View activation notification for the specified view.

IMPORT_C void NotifyNextActivation(TVwsViewId& aViewId,  MCoeViewActivationObserver& aViewActivationObserver)

MCoeViewActivationObserver

View activation notification for any view registered with view server.

IMPORT_C void NotifyNextActivation(MCoeViewActivationObserver& aViewActivationObserver)

MCoeViewDeactivationObserver

View deactivation notification for the specified view.

IMPORT_C void NotifyNextDeactivation (TVwsViewId& aViewId, MCoeViewDeactivationObserver& aViewDeactivationObserver)

MCoeViewDeactivationObserver

View deactivation notification for any view registered with view server.

IMPORT_C void NotifyNextDeactivation (MCoeViewDeactivationObserver& aViewDeactivationObserver)

The following code snippet shows implementing the MCoeViewActivationObserver observer interface class:

/** 
CMCoeViewActivationObserver  - implements the MCoeViewActivationObserver interface for notifications only
*/
CMCoeViewActivationObserver* CMCoeViewActivationObserver::NewL()    
    {
    CMCoeViewActivationObserver* self=new( ELeave ) CMCoeViewActivationObserver();
    return self;
    }
void CMCoeViewActivationObserver::HandleViewActivation( const TVwsViewId& aNewlyActivatedViewId,
                                                        const TVwsViewId& aViewIdToBeDeactivated )    
    {_
    LIT( Kmessage, "Notified MCoeViewActivationObserver::HandleViewActivation: Newly Active View: 0x%x - Deactivate 0x%x" )    
    INFO_PRINTF2( Kmessage, aNewlyActivatedViewId.iViewUid.iUid, aViewIdToBeDeactivated.iViewUid.iUid );
    }