author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Fri, 19 Feb 2010 22:51:01 +0200 | |
branch | RCL_3 |
changeset 9 | 6b87b143d312 |
parent 0 | 4e91876724a2 |
child 13 | bcb43dc84c44 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2007-2008 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: The scheduler for the slideshow |
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* |
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*/ |
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|
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|
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#include "shweventrouter.h" |
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#include "shweventobserver.h" |
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#include "shweventpublisher.h" |
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#include "shwevent.h" |
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#include "shwslideshowenginepanic.h" |
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|
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#include <glxlog.h> |
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#include <glxtracer.h> |
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|
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// constants |
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namespace |
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{ |
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// the typical amount of observers. In current design six, |
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// increase if there is more observers in future |
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const TInt KEventObserverGranularity = 7; |
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const TInt KMaxNumberOfConcurrentEvents = 10; |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// C++ Constructor. Save a few bits of rom with inlining |
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// ----------------------------------------------------------------------------- |
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inline CShwEventRouter::CShwEventRouter() |
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: iObservers( KEventObserverGranularity ), |
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iEvents( KMaxNumberOfConcurrentEvents ) |
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{ |
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// No implementation required |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// NewL. Static construction |
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// ----------------------------------------------------------------------------- |
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CShwEventRouter* CShwEventRouter::NewL() |
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{ |
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TRACER("CShwEventRouter::NewL()"); |
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CShwEventRouter* self = new( ELeave ) CShwEventRouter; |
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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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// ----------------------------------------------------------------------------- |
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// Destructor. |
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// ----------------------------------------------------------------------------- |
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CShwEventRouter::~CShwEventRouter() |
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{ |
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TRACER("CShwEventRouter::~CShwEventRouter"); |
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GLX_LOG_INFO("CShwEventRouter::~CShwEventRouter"); |
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// need to cleanup cloned events if we did get run down |
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if( iEvents.Count() > 0 ) |
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{ |
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for( int i = 0; i < iEvents.Count(); i++ ) |
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{ |
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// call the destructor |
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delete iEvents[ i ]; |
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} |
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} |
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// close the event array itself, this frees the memory |
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iEvents.Close(); |
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// close the observer array itself, this frees the memory |
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// NOTE! we did not have ownership of the observers |
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iObservers.Close(); |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// ConstructL. |
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// ----------------------------------------------------------------------------- |
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void CShwEventRouter::ConstructL() |
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{ |
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TRACER("CShwEventRouter::ConstructL"); |
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GLX_LOG_INFO("CShwEventRouter::ConstructL"); |
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// reserve space for the events so we should never leave in event handling |
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iEvents.ReserveL( KMaxNumberOfConcurrentEvents ); |
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iInsideEventLoop = EFalse; |
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} |
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|
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// ----------------------------------------------------------------------------- |
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// AddObserversL. |
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// ----------------------------------------------------------------------------- |
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void CShwEventRouter::AddObserversL( TArray<MShwEventObserver*> aObservers ) |
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{ |
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TRACER("CShwEventRouter::AddObserversL"); |
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GLX_LOG_INFO( "CShwEventRouter::AddObserversL" ); |
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104 |
// add each observer |
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for( TInt i = 0; i < aObservers.Count(); i++ ) |
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106 |
{ |
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AddObserverL( aObservers[ i ] ); |
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108 |
} |
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109 |
} |
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110 |
|
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111 |
// ----------------------------------------------------------------------------- |
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// AddObserverL. |
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// ----------------------------------------------------------------------------- |
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void CShwEventRouter::AddObserverL( MShwEventObserver* aObserver ) |
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115 |
{ |
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TRACER("CShwEventRouter::AddObserverL( MShwEventObserver* aObserver )"); |
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GLX_LOG_INFO("CShwEventRouter::AddObserverL(MShwEventObserver* aObserver)"); |
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__ASSERT_DEBUG( aObserver, User::Panic( _L("Null observer not allowed"), 1 ) ); |
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iObservers.AppendL( aObserver ); |
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120 |
} |
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121 |
|
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122 |
// ----------------------------------------------------------------------------- |
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// AddProducers. |
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124 |
// ----------------------------------------------------------------------------- |
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void CShwEventRouter::AddProducers( TArray< MShwEventPublisher* > aPublishers ) |
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126 |
{ |
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TRACER("CShwEventRouter::AddProducers"); |
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GLX_LOG_INFO( "CShwEventRouter::AddProducers" ); |
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// add each publisher |
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for( TInt i = 0; i < aPublishers.Count(); i++ ) |
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131 |
{ |
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AddProducer( aPublishers[ i ] ); |
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133 |
} |
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134 |
} |
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135 |
|
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136 |
// ----------------------------------------------------------------------------- |
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// AddProducer. |
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138 |
// ----------------------------------------------------------------------------- |
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void CShwEventRouter::AddProducer( MShwEventPublisher* aPublisher ) |
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140 |
{ |
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TRACER("CShwEventRouter::AddProducers(MShwEventPublisher* aPublisher)"); |
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GLX_LOG_INFO( "CShwEventRouter::AddProducer" ); |
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// give the publisher the event queue so they can start calling us |
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aPublisher->SetEventQueue( this ); |
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145 |
} |
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146 |
|
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// ----------------------------------------------------------------------------- |
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// SendEventL. The method that handles the event dispatching. |
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// The events are dispatched in same order as they are sent, so if an event |
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// is sent while previous is beeing dispatched we queue the event and |
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// send it after the previous is dispatched to all observers |
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// ----------------------------------------------------------------------------- |
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void CShwEventRouter::SendEventL( MShwEvent* aEvent ) |
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154 |
{ |
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TRACER("CShwEventRouter::SendEventL( MShwEvent* aEvent )"); |
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GLX_LOG_INFO( "CShwEventRouter::SendEvent" ); |
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__ASSERT_DEBUG( aEvent, User::Panic( _L("Null event not allowed"), 2 ) ); |
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158 |
|
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// add the event to the queue |
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// need to clone the event as the calling code may get out of scope |
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// before we have time to deliver the event |
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// this should never leave as we have reserved space in the array |
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MShwEvent* clone = aEvent->CloneLC(); |
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iEvents.AppendL( clone ); |
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// we take ownership of the clone so pop it off the stack |
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CleanupStack::Pop( clone ); |
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167 |
|
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// are we inside event loop: when an event is beeing sent we may be |
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// delivering an earlier event |
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if( iInsideEventLoop ) |
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171 |
{ |
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// there is an event beeing served so queue the event and return |
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// the event will be served once previous one is served |
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return; |
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175 |
} |
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// ok, dwell into the event serving loop |
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// when we fall here we are just about to serve the one event |
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// we may get new events while processing the old ones however |
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iInsideEventLoop = ETrue; |
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180 |
do |
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181 |
{ |
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// take the first event |
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MShwEvent* event = iEvents[ 0 ]; |
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TInt i = 0; |
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// notify all observers |
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for( ; i < iObservers.Count(); i++ ) |
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187 |
{ |
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iObservers[ i ]->NotifyL( event ); |
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189 |
} |
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// this event is served, remove it and delete it |
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iEvents.Remove( 0 ); |
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// delete the clone |
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delete event; |
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// if there are new events, deliver them as well |
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195 |
} |
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while( iEvents.Count() > 0 ); |
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// done processing events, safe to enter the loop again |
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iInsideEventLoop = EFalse; |
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199 |
} |
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200 |