camerauis/cameraapp/generic/src/CamZoomUpdateManager.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 07 Jan 2010 16:18:56 +0200
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permissions -rw-r--r--
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/*
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* Copyright (c) 2003-2009 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:  ????????????????
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*
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*/
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//INCLUDES
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#include "CamZoomUpdateManager.h"
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#include "CamUtility.h"
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#include "CameraUiConfigManager.h"
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//MACROS
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// Cooldown period inbetween camera driver updates
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const TInt KCamZoomCooldown    = 200000;  // .2  seconds
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const TInt KCamMaxZoomCooldown = 250000;  // .25 seconds
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// ====================== MEMBER FUNCTIONS =====================
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// -----------------------------------------------------------------------------
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// CCamZoomUpdateManager::NewL
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// Two-phased constructor.
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// -----------------------------------------------------------------------------
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//
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CCamZoomUpdateManager* CCamZoomUpdateManager::NewL( CCamAppController& aController )
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    {
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    PRINT((_L("CCamZoomUpdateManager::NewL in")));
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    CCamZoomUpdateManager* self = new(ELeave) CCamZoomUpdateManager( aController );
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    CleanupStack::PushL(self);
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    self->ConstructL ();
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    CleanupStack::Pop();
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    PRINT((_L("CCamZoomUpdateManager::NewL out")));
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    return self;
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    }
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// -----------------------------------------------------------------------------
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// CCamZoomUpdateManager::CCamZoomUpdateManager
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// C++ default constructor can NOT contain any code, that
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// might leave.
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// -----------------------------------------------------------------------------
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//
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CCamZoomUpdateManager::CCamZoomUpdateManager( CCamAppController& aController ) :
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        CActive( /*EPriorityStandard*/ EPriorityUserInput ),
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        iController( aController )
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    {
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    iDelayedUpdate = EFalse;
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    }
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// -----------------------------------------------------------------------------
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// CCamZoomUpdateManager::~CCamZoomUpdateManager
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// Destructor.
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// -----------------------------------------------------------------------------
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//
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CCamZoomUpdateManager::~CCamZoomUpdateManager()
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{
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    PRINT((_L("CCamZoomUpdateManager::~CCamZoomUpdateManager() in")));
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    Cancel();
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    iTimer.Close();
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    PRINT((_L("CCamZoomUpdateManager::~CCamZoomUpdateManager() out")));
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}
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// -----------------------------------------------------------------------------
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// CCamZoomUpdateTimer::ConstructL
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// Symbian 2nd phase constructor.
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// -----------------------------------------------------------------------------
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//
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void CCamZoomUpdateManager::ConstructL()
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    {
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    PRINT((_L("CCamZoomUpdateManager::ConstructL() in")));
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    TRAPD( err, ReadDelayValuesL() );
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    if( err )
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        {
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        PRINT((_L("CCamZoomUpdateManager::ConstructL() error in reading delay values")));
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        }
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    User::LeaveIfError(iTimer.CreateLocal());
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    CActiveScheduler::Add(this);
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    PRINT((_L("CCamZoomUpdateManager::ConstructL() out")));
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    }
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// -----------------------------------------------------------------------------
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// CCamZoomUpdateManager::SetZoomValue
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// 
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// -----------------------------------------------------------------------------
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//
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void CCamZoomUpdateManager::SetZoomValue( TInt aValue )
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    {
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    PRINT((_L("CCamZoomUpdateManager::SetZoomValue() => in")));
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    // PUT IN MUTEX????
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    // update value
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    iValue = aValue;
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    if ( IsActive() )
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        {
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        // check for starvation
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        TTime current;
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        current.UniversalTime();
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        TInt64 delay = current.MicroSecondsFrom(iCooldownStart).Int64();
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        if ( delay > iCamMaxZoomCooldown )
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            {
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            PRINT((_L("CCamZoomUpdateManager::SetZoomValue() <> IsActive, starved")));
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            // force update if active object is starved
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            Cancel();
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            UpdateAndStartWait();
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            }
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        else
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            {
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            PRINT((_L("CCamZoomUpdateManager::SetZoomValue() <> IsActive, updating iValue")));
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            // set the delayed update flag and wait
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            iDelayedUpdate = ETrue;    
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            }
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        }
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    else
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        {
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        PRINT((_L("CCamZoomUpdateManager::SetZoomValue() <> IsNotActive, setting zoom")));
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        // notify controller and set active
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        UpdateAndStartWait();
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        }
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    PRINT((_L("CCamZoomUpdateManager::SetZoomValue() <= out")));
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    }
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   145
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// -----------------------------------------------------------------------------
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// CCamZoomUpdateManager::UpdateAndStartWait
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// 
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// -----------------------------------------------------------------------------
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//
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void CCamZoomUpdateManager::UpdateAndStartWait()
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    {
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    // update cooldown start time
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    iCooldownStart.UniversalTime();
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    // reset delayed update flag
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    iDelayedUpdate = EFalse;
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    // notify iController
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    iController.SetZoomValue( iValue );
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    // activate cooldown period
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    SetActive();
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    iTimer.After( iStatus, iCamZoomCooldown );
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    }
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// -----------------------------------------------------------------------------
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// CCamZoomUpdateManager::RunL
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// 
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// -----------------------------------------------------------------------------
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//
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void CCamZoomUpdateManager::RunL()
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    {
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    PRINT((_L("CCamZoomUpdateManager::RunL() in")));
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    //PUT IN MUTEX??
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   177
    
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    if ( iDelayedUpdate )
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        {
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        // notify controller and set active
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        UpdateAndStartWait();
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        }
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parents:
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   183
     
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    PRINT((_L("CCamZoomUpdateManager::RunL() out")));
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    }
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// -----------------------------------------------------------------------------
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// CCamZoomUpdateManager::DoCancel
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// Cancels the timer
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parents:
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   190
// -----------------------------------------------------------------------------
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   191
//
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   192
void CCamZoomUpdateManager::DoCancel()
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   193
    {
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   194
    PRINT((_L("CCamZoomUpdateManager::DoCancel() in")));
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    // cancel the timer
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   196
    iTimer.Cancel();
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   197
    PRINT((_L("CCamZoomUpdateManager::DoCancel() out")));
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parents:
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   198
    }
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   199
    
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   200
// -----------------------------------------------------------------------------
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// CCamZoomUpdateManager::ReadDelayValuesL
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parents:
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   202
// Gets delay values from cenrep
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parents:
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   203
// -----------------------------------------------------------------------------
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//
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   205
void CCamZoomUpdateManager::ReadDelayValuesL()
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parents:
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    {
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    // default values are used in case of error
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parents:
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    iCamZoomCooldown = KCamZoomCooldown;
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parents:
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    iCamMaxZoomCooldown = KCamMaxZoomCooldown;
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    RArray<TInt> delayValues;
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parents:
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   211
    if( iController.UiConfigManagerPtr() )
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parents:
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   212
        {
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   213
        iController.UiConfigManagerPtr()->SupportedZoomDelaysL( delayValues );
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parents:
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   214
        iCamZoomCooldown = delayValues[0]*1000;
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parents:
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   215
        iCamMaxZoomCooldown = delayValues[1]*1000;
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parents:
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   216
        }
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parents:
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    }
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parents:
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   218
// End of File