/*

* Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies). 

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:    The effect interface

 *

*/

#ifndef __SHWCONSTANTS_H__

#define __SHWCONSTANTS_H__

// INCLUDES

#include <e32std.h>

// FORWARD DECLARATIONS

// CLASS DECLARATION

/**

 * Namespace for slideshow constants.

 */

namespace NShwSlideshow

    {

    enum TPlayDirection

        {

        EPlayForwards = 1,	// default

        EPlayBackwards,

        EPlayRandom

        };

    // Named constants for navigation directions 

    // to avoid "magic number" warnings

    const TInt KNavigateForwards = 1;

    const TInt KNavigateBackwards = -1;

    // Engine DLL's uid

    const TUid KEngineDllUid = {0x200071D3};

    // First visual fade-in time, also applies when user navigates

    const TInt KFirstEffectFadeInDuration = 0;

    // default transition duration, milliseconds

    const TInt KDefaultTransitionDuration = 2000;	

    // @todo get correct UID for effect types

    /**

    The effect Id is a combination of the ecom plugin UID and an array index

    within the plugin.

    */

    const TUid KDefaultEffectPluginUid = { 0x200071D6 };

    // Crossfade effects name - used if no localised strings are available

    _LIT( KEffectNameCrossFade, "Cross Fade" );

    // maximum opacity for TShwCrossFadeLayout

    const TReal32 KMaxOpacity = 1.0;

    // minimum opacity for TShwCrossFadeLayout

    const TReal32 KMinOpacity = 0.0;

    // effect Index - the index within the ecom plugin

    const TInt KEffectUidXFadeNormal = 1;

    const TInt KEffectUidZoomAndPan  = 0;

    // Zoom and Pan effect's name - used if no localised strings are available

    _LIT( KEffectNameZoomAndPan, "Zoom and Pan" );

    // maximum zoom ever is 200%, note that this should 

    // not be larger than MaxThumbnailSize

    const TReal32 KMaxZoomAndPanFactor = 2.0;

    // optimal zoom is 100%

    const TReal32 KOptimalZoomAndPanFactor = 1.0;

    // this defines the minimum zoom factor,

    // 1.2 means we zoom images that are originally larger than 120% of the screen

    const TReal32 KMinZoomAndPanFactor = 1.2;

    // this constant specifies the length of the curve for panning

    const TInt KZoomAndPanCurveLength = 100;

    // set the maximum loaded thumbnail size to be 2 times the screen

    // note that this should not be smaller than KMaxZoomAndPanFactor

    // otherwise we zoom beyond 1:1 pixelsize in big pictures

    const TInt KMaxThumbnailSize = 2;

    // maximum effect name length

    const TUint KMaxEffectNameLen = 64;

    /// Thumbnail loading

    // priority 2 is the highest we use, we need size 

    // attribute to be loaded first

    const TInt KSizeContextPriority = 2;

    // load image sizes 4 items in front and back

    const TInt KSizeContextOffset = 4;

    // lowest priority for the high quality context

    // because we have time to wait as we have 

    // default icon to show

    const TInt KHighQualityContextPriority = 0;

    }

#endif // __SHWCONSTANTS_H__