1 /*

     2 * Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

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

     6 * which accompanies this distribution, and is available

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

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description: 

    15 *

    16 */

    17 /*

    18  * gestureeventfilter.cpp

    19  *

    20  *  Created on: Jan 22, 2009

    21  *      Author: tyutyuni

    22  */

    23 

    24 #include "gesturedefs.h"

    25 #include "gestureeventfilter.h"

    26 

    27 

    28 using namespace RT_GestureHelper;

    29 

    30 CGestureEventFilter::CGestureEventFilter(TInt aTapSize):iTapSize(aTapSize)

    31     {

    32     

    33     }

    34 

    35 CGestureEventFilter::~CGestureEventFilter()

    36     {

    37     

    38     }

    39 

    40 

    41 TBool CGestureEventFilter::FilterDrag(const TPointerEvent& aPointerEvent, TInt& aReason)

    42     {

    43     TTime now;

    44     now.HomeTime();

    45     return FilterDrag(aPointerEvent, now, aReason);

    46     }

    47 

    48 TBool CGestureEventFilter::FilterDrag(const TPointerEvent& aPointerEvent, TTime& eventTime, TInt& aReason)

    49     {

    50     TBool filtered = EFalse;

    51     

    52     aReason = EFilteredNoReason;

    53     

    54     switch (aPointerEvent.iType)

    55         {

    56         case TPointerEvent::EButton1Down:

    57             {

    58             iIsTouchDown = ETrue;

    59             iTouchDownTime = iLastEventTime;

    60             iTouchDownPos = aPointerEvent.iPosition;

    61             break;

    62             }

    63         case TPointerEvent::EDrag:

    64             {

    65             if (iIsTouchDown)

    66                 {

    67                 TPoint delta = aPointerEvent.iPosition - iTouchDownPos;

    68                 filtered = (Abs(delta.iX) <= iTapSize && Abs(delta.iY) <= iTapSize);

    69                 aReason = (filtered) ? EFilteredBySize : EFilteredNoReason;

    70                 }

    71                 

    72             if (!filtered)

    73                 {

    74                 filtered = (eventTime.MicroSecondsFrom(iLastEventTime) < KMinTimeBetweenDrags);

    75                 aReason = (filtered) ? EFilteredByTime : EFilteredNoReason;

    76                 }

    77             

    78             if (!filtered)

    79                 {

    80                 iLastEventTime = eventTime;

    81                 }

    82             iIsTouchDown = filtered;

    83             

    84             break;

    85             }

    86         case TPointerEvent::EButton1Up:

    87             {

    88             iIsTouchDown = EFalse;

    89             break;

    90             }

    91         }

    92     

    93     

    94     return filtered;

    95     }