calendarui/controller/src/calennotifier.cpp
author hgs
Mon, 12 Jul 2010 02:32:28 +0530
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permissions -rw-r--r--
201027
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/*
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* Copyright (c) 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:  Calendar notifier
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*
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*/
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//system includes
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#include <e32property.h>
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#include <bacntf.h>                   // CEnvironmentChangeNotifier
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#include <coemain.h>                  // EActivePriorityLogonA
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//user includes
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#include "calendarui_debug.h"
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#include "calennotifier.h"            // CalenNotifier
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#include "calenstatemachine.h"
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#include "OstTraceDefinitions.h"
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#ifdef OST_TRACE_COMPILER_IN_USE
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#include "calennotifierTraces.h"
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#endif
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const TInt KHashLength = 64;
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// ----------------------------------------------------------------------------
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// CalenNotifier::CalenNotifier
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// C++ default constructor.
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// (other items were commented in a header).
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// ----------------------------------------------------------------------------
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//
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CalenNotifier::CalenNotifier( CCalenStateMachine& aStateMachine )
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    : iStateMachine( aStateMachine )
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    {
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    OstTraceFunctionEntry0( CALENNOTIFIER_CALENNOTIFIER_ENTRY );
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    OstTraceFunctionExit0( CALENNOTIFIER_CALENNOTIFIER_EXIT );
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    }
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// ----------------------------------------------------------------------------
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// CalenNotifier::~CalenNotifier
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// Destructor.
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// (other items were commented in a header).
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// ----------------------------------------------------------------------------
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//
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CalenNotifier::~CalenNotifier()
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    {
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    OstTraceFunctionEntry0( DUP1_CALENNOTIFIER_CALENNOTIFIER_ENTRY );
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    // Reset the handler array.
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    // Before we reset , close hashset for each handler
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    for(TInt i = 0 ; i < iHandlers.Count() ; i++)
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        {
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        iHandlers[i].iHashSet.Close();
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        }
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    iHandlers.Reset();
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    iBroadcastQueue.Reset();
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    // Stop environment change notifications
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    if( iEnvChangeNotifier )
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        {
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        iEnvChangeNotifier->Cancel();
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        delete iEnvChangeNotifier;
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        }
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    OstTraceFunctionExit0( DUP1_CALENNOTIFIER_CALENNOTIFIER_EXIT );
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    }
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// ----------------------------------------------------------------------------
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// CalenNotifier::ConstructL
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// Symbian 2nd phase of construction.
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// (other items were commented in a header).
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// ----------------------------------------------------------------------------
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//
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void CalenNotifier::ConstructL()
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    {
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    OstTraceFunctionEntry0( CALENNOTIFIER_CONSTRUCTL_ENTRY );
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    // Register for system environment changes
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    TCallBack envCallback( EnvChangeCallbackL, this );
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    iEnvChangeNotifier =
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        CEnvironmentChangeNotifier::NewL( EActivePriorityLogonA, envCallback );
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    iEnvChangeNotifier->Start();
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    iIgnoreFirstLocaleChange = ETrue;
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    OstTraceFunctionExit0( CALENNOTIFIER_CONSTRUCTL_EXIT );
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    }
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// ----------------------------------------------------------------------------
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// CalenNotifier::RegisterForNotificationsL
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// Adds the passed handler to the handler array.
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// (other items were commented in a header).
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// ----------------------------------------------------------------------------
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//
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void CalenNotifier::RegisterForNotificationsL( MCalenNotificationHandler* aHandler, 
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                                                TCalenNotification aNotification)
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    {
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    OstTraceFunctionEntry0( CALENNOTIFIER_REGISTERFORNOTIFICATIONSL_ENTRY );
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    TNotificationHandler handler;
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    handler.iHandler = aHandler;
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    //Prepare hash
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    handler.iHashSet.ReserveL(KHashLength);
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    if(ECalenNotifyAll == aNotification)
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        {
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        //ECalenNotifyAll indicates that all notifications to be registered
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        //iterate through TCalenNotification enum and add the notifications to iHashSet
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        for(TCalenNotification notificationIter = TCalenNotification(ECalenNotifyAll + 1); 
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                                notificationIter < ECalenNotifyLast; 
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                                notificationIter = TCalenNotification(notificationIter + 1))
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            {
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            handler.iHashSet.InsertL(notificationIter);
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            }
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        }
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    else
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        {
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        //Add only single notification.
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        handler.iHashSet.InsertL(aNotification);
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        }
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    iHandlers.Append( handler );
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    OstTraceFunctionExit0( CALENNOTIFIER_REGISTERFORNOTIFICATIONSL_EXIT );
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    }
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// ----------------------------------------------------------------------------
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// CalenNotifier::RegisterForNotificationsL
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// Adds the passed handler to the handler array.
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// (other items were commented in a header).
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// ----------------------------------------------------------------------------
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//
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void CalenNotifier::RegisterForNotificationsL( MCalenNotificationHandler* aHandler, 
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                                                           RArray<TCalenNotification>& aNotifications  )
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    {
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    OstTraceFunctionEntry0( DUP1_CALENNOTIFIER_REGISTERFORNOTIFICATIONSL_ENTRY );
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    TNotificationHandler handler;
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    handler.iHandler = aHandler;
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    //Prepare hash
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    handler.iHashSet.ReserveL(KHashLength);
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    if(aNotifications.Find(ECalenNotifyAll) != KErrNotFound)
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        {
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        //ECalenNotifyAll indicates that all notifications to be registered
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        //If ECalenNotifyAll is found in aNotifications along with other notifications
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        //iterate through TCalenNotification enum and add the notifications to iHashSet
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        for(TCalenNotification notificationIter = TCalenNotification(ECalenNotifyAll + 1); 
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                                    notificationIter < ECalenNotifyLast; 
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                                    notificationIter = TCalenNotification(notificationIter + 1))
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            {
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            handler.iHashSet.InsertL(notificationIter);
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            }
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        }
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    else
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        {
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        //Add notifocations from Array(aNotifications) into iHashSet member 
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        for(TInt i = 0 ; i < aNotifications.Count() ; i++)
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            {
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            handler.iHashSet.InsertL(aNotifications[i]);
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            }
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        }
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    iHandlers.Append( handler );
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    OstTraceFunctionExit0( DUP1_CALENNOTIFIER_REGISTERFORNOTIFICATIONSL_EXIT );
0
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    }
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// ----------------------------------------------------------------------------
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// CalenNotifier::CancelNotifications
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// Removes the passed handler from the handler array.
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// (other items were commented in a header).
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// ----------------------------------------------------------------------------
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//
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void CalenNotifier::CancelNotifications( MCalenNotificationHandler* aHandler )
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    {
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    OstTraceFunctionEntry0( CALENNOTIFIER_CANCELNOTIFICATIONS_ENTRY );
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0
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    for( TInt x = 0; x < iHandlers.Count(); ++x )
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        {
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        if( iHandlers[x].iHandler == aHandler )
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            {
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            // Mark the notification for deletion by
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            // settings the handler to NULL. Actual deletion
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            // will take place in DoBroadcast
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            iHandlers[x].iHashSet.Close();
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            iHandlers[x].iHandler = NULL;
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            TRACE_EXIT_POINT;
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            OstTraceFunctionExit0( CALENNOTIFIER_CANCELNOTIFICATIONS_EXIT );
0
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            return;
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            }
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        }
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    OstTraceFunctionExit0( DUP1_CALENNOTIFIER_CANCELNOTIFICATIONS_EXIT );
0
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    }
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// ----------------------------------------------------------------------------
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// CalenNotifier::ContextChanged
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// From MCalenContextChangeObserver. Called when the context changes.
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// (other items were commented in a header).
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// ----------------------------------------------------------------------------
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//
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void CalenNotifier::ContextChanged()
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    {
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    OstTraceFunctionEntry0( CALENNOTIFIER_CONTEXTCHANGED_ENTRY );
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0
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    BroadcastNotification( ECalenNotifyContextChanged );
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    OstTraceFunctionExit0( CALENNOTIFIER_CONTEXTCHANGED_EXIT );
0
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    }
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// ----------------------------------------------------------------------------
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//  CCalenNotifier::EnvChangeCallbackL
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//  CEnvironmentChangeNotifier callback.  Calendar is only interested in:
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//  EChangesLocale              - System locale changed
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//  EChangesMidnightCrossover   - System time passed midnight
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//  EChangesSystemTime          - System time changed
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// (other items were commented in a header).
0
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// ----------------------------------------------------------------------------
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//
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TInt CalenNotifier::EnvChangeCallbackL( TAny* aThisPtr )
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    {
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    OstTraceFunctionEntry0( CALENNOTIFIER_ENVCHANGECALLBACKL_ENTRY );
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    OstTraceFunctionExit0( CALENNOTIFIER_ENVCHANGECALLBACKL_EXIT );
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    // Return value for functions used as TCallBack objects should be EFalse
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    // unless the function is intended to be called again from a timer.
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   // return EFalse;
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    return static_cast<CalenNotifier*>(aThisPtr)->DoEnvChange();
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    }
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// ----------------------------------------------------------------------------
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//  CCalenNotifier::DoEnvChange
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//  EnvChangeCallbackL calls this function
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// ----------------------------------------------------------------------------
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//
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TInt CalenNotifier::DoEnvChange()
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    {
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    OstTraceFunctionEntry0( CALENNOTIFIER_DOENVCHANGE_ENTRY );
0
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    if( ((iEnvChangeNotifier->Change() & EChangesMidnightCrossover)
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        || (iEnvChangeNotifier->Change() & EChangesSystemTime))
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        && !iIgnoreFirstLocaleChange )
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        {
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        BroadcastNotification( ECalenNotifySystemTimeChanged );
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        }
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    else if( (iEnvChangeNotifier->Change() & EChangesLocale)
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            && !iIgnoreFirstLocaleChange )  
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        {
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        BroadcastNotification( ECalenNotifySystemLocaleChanged );
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        }
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     else
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        {
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        iIgnoreFirstLocaleChange = EFalse;
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        }   
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    OstTraceFunctionExit0( CALENNOTIFIER_DOENVCHANGE_EXIT );
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    return EFalse ;
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    }
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// ----------------------------------------------------------------------------
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// CalenNotifier::BroadcastNotification
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// Issues a notification to all registered handlers
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// (other items were commented in a header).
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// ----------------------------------------------------------------------------
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//
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void CalenNotifier::BroadcastNotification( TCalenNotification aNotification )
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    {
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    OstTraceFunctionEntry0( CALENNOTIFIER_BROADCASTNOTIFICATION_ENTRY );
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    // Someone has told us to broadcast, or one of our notifiers completed.
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    // We run it past the state machine and that may or may not call the
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    // function to really do the broadcast.
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    iStateMachine.HandleNotification( aNotification );
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    OstTraceFunctionExit0( CALENNOTIFIER_BROADCASTNOTIFICATION_EXIT );
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    }
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// ----------------------------------------------------------------------------
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// CalenNotifier::BroadcastApprovedNotification
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// Issues a notification to all registered handlers
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// (other items were commented in a header).
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// ----------------------------------------------------------------------------
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//
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void CalenNotifier::BroadcastApprovedNotification( TCalenNotification aNotification )
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    {
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    OstTraceFunctionEntry0( CALENNOTIFIER_BROADCASTAPPROVEDNOTIFICATION_ENTRY );
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    iBroadcastQueue.Append( aNotification );
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    if( !iBroadcastActive )
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        {
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        iBroadcastActive = ETrue;
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        while( iBroadcastQueue.Count() )
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            {
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            TCalenNotification notification = iBroadcastQueue[0];
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            DoBroadcast( notification );
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            iBroadcastQueue.Remove( 0 );
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            }
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        iBroadcastActive = EFalse;
0
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        }
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    OstTraceFunctionExit0( CALENNOTIFIER_BROADCASTAPPROVEDNOTIFICATION_EXIT );
0
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    }
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// ----------------------------------------------------------------------------
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// CalenNotifier::DoBroadcast
0
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// Issues a notification to all registered handlers
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// (other items were commented in a header).
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// ----------------------------------------------------------------------------
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//
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void CalenNotifier::DoBroadcast( TCalenNotification aNotification )
0
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    {
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    OstTraceFunctionEntry0( CALENNOTIFIER_DOBROADCAST_ENTRY );
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0
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    for( TInt x = 0; x < iHandlers.Count(); ++x )
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        {
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        TNotificationHandler handler = iHandlers[x];
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        if( handler.iHandler )
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            {
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             if( handler.iHashSet.Find(aNotification) )
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                {
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                handler.iHandler->HandleNotification( aNotification );
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                }
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            }
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        else
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            {
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            // The handler has been marked for deletion
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            iHandlers.Remove( x ); // remove the entry
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            --x; // decrement the index.
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            }
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        }
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    OstTraceFunctionExit0( CALENNOTIFIER_DOBROADCAST_EXIT );
0
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    }
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// ----------------------------------------------------------------------------
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// CalenNotifier::TNotificationHandler()
0
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// TNotificationHandler contructor
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// ----------------------------------------------------------------------------
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CalenNotifier::TNotificationHandler::TNotificationHandler() : 
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                iHashSet(&::HashCalenNotificationFunction,&::HashCalenNotificationIdentityRelation)
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    {
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    OstTraceFunctionEntry0( TNOTIFICATIONHANDLER_TNOTIFICATIONHANDLER_ENTRY );
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    OstTraceFunctionExit0( TNOTIFICATIONHANDLER_TNOTIFICATIONHANDLER_EXIT );
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    }
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// End of file