/*

* Copyright (c) 2009 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:

*

*/

#include <aknpointereventsuppressor.h>

#include <aknlayoutscalable_avkon.cdl.h>

const TInt KAknPointerEventSuppressorDefaultMaxTapDuration = 400000;	// 0.4 seconds

const TInt KAknPointerEventSuppressorDefaultMinInterDragInterval = 0;

EXPORT_C CAknPointerEventSuppressor* CAknPointerEventSuppressor::NewL()

	{

	return new(ELeave) CAknPointerEventSuppressor;

	}

EXPORT_C CAknPointerEventSuppressor::~CAknPointerEventSuppressor()

	{

	}

CAknPointerEventSuppressor::CAknPointerEventSuppressor()

: iMaxTapDuration(KAknPointerEventSuppressorDefaultMaxTapDuration),

  iMinInterDragInterval(KAknPointerEventSuppressorDefaultMinInterDragInterval),

  iTap(EFalse)

  	{

  	// default move limit is 6 units, which seems to be a forgiving value for finger touch

    TInt maxMove = AknLayoutScalable_Avkon::aid_value_unit2().LayoutLine().iW * 6 / 10;

	iMaxTapMove.iWidth = maxMove;

	iMaxTapMove.iHeight = maxMove;

  	}

EXPORT_C TBool CAknPointerEventSuppressor::SuppressPointerEvent(const TPointerEvent& aPointerEvent)

	{

	switch (aPointerEvent.iType)

		{

		case TPointerEvent::EButton1Down:

			iDownTime.HomeTime();

			iTap = ETrue;

			iDownPos = aPointerEvent.iPosition;

			iLastEventTime = iDownTime;

			break;

		case TPointerEvent::EDrag:

			{

			TTime now;

			now.HomeTime();

			if (iTap)

				{

				TPoint delta = aPointerEvent.iPosition - iDownPos;

				if (Abs(delta.iX) > iMaxTapMove.iWidth ||

					Abs(delta.iY) > iMaxTapMove.iHeight ||

					now.MicroSecondsFrom(iDownTime) >= iMaxTapDuration)

					{

					// This touch action has gone outside the parameters of a tap

					// the drag event should be handled

					iTap = EFalse;

					iLastEventTime = now;

					return EFalse;

					}

				else

					{

					// still a tap, so suppress the drag event

					return ETrue;

					}

				}

			else if (now.MicroSecondsFrom(iLastEventTime) < iMinInterDragInterval)

				{

				// too soon since the last drag, suppress it

				return ETrue;

				}

			// this drag event should be handled

			iLastEventTime = now;

			break;

			}

		case TPointerEvent::EButton1Up:

			iTap = EFalse;

			break;

		default:

			break;

		}

	// all non-drag events should be handled

	return EFalse;

	}

EXPORT_C void CAknPointerEventSuppressor::SetMaxTapDuration(TTimeIntervalMicroSeconds aDuration)

	{

	iMaxTapDuration = aDuration;

	}

EXPORT_C void CAknPointerEventSuppressor::SetMaxTapMove(TSize aMoveLimits)

	{

	iMaxTapMove = aMoveLimits;

	}

EXPORT_C void CAknPointerEventSuppressor::SetMinInterDragInterval(TTimeIntervalMicroSeconds aInterval)

	{

	iMinInterDragInterval = aInterval;

	}