mulwidgets/gesturehelper/src/utils.cpp
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 17 Dec 2009 08:56:02 +0200
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/*
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* Copyright (c) 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:  Gesture recognition utilities
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*
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*/
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#include "utils.h"
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#include <coemain.h> // for CCoeEnv
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#include <eikappui.h>  // for CEikAppUi
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#include "gesturedefs.h"
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namespace GestureHelper
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    {
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    /** @return the longer edge of the size */
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    inline TInt LongerEdge( const TSize& aSize ) 
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        {
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        return Max( aSize.iHeight, aSize.iWidth );
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        }
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    // for documentation, see header file
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    TRect ToleranceRect( const TPoint& aCenterPoint ) 
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        {
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        TSize screenSize = static_cast<CEikAppUi*>( CCoeEnv::Static()->AppUi() )
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            ->ApplicationRect().Size(); 
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        // multiplication has to be done first, to avoid rounding integer to 0 with division
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        int toleranceLength = ( KGestureTolerancePercent * LongerEdge( screenSize ) ) / 100; 
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        TRect toleranceRect( aCenterPoint, TSize() );
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        // grow by the tolerance length, while keeping the center point
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        toleranceRect.Shrink( -toleranceLength, -toleranceLength );
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        return toleranceRect;
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        }
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     // for documentation, see header file
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    TRect ToleranceRect( const TPoint& aCenterPoint, MGestureEvent::TAxis aRelevantAxis ) 
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        {
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        TRect toleranceRect = ToleranceRect(aCenterPoint);
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		TSize screenSize = static_cast<CEikAppUi*>( CCoeEnv::Static()->AppUi() )
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            ->ApplicationRect().Size();
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		if(aRelevantAxis == MGestureEvent::EAxisHorizontal)
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			{
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			toleranceRect.iTl.iY = 0;
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        	toleranceRect.iBr.iY = screenSize.iHeight;	
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			}
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		else if(aRelevantAxis == MGestureEvent::EAxisVertical)
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			{
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			toleranceRect.iTl.iX = 0;
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        	toleranceRect.iBr.iX = screenSize.iWidth;	
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			}
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		else // EAxisBoth
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			{
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			// nothing to be done	
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			}                   
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        return toleranceRect;
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        }
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    } // namespace GestureHelper