1 /*

     2 * Copyright (c) 2008 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 "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:  Gesture helper constant definitions

    15 *

    16 */

    17 

    18 

    19 #ifndef _XNGESTUREDEFS_H_

    20 #define _XNGESTUREDEFS_H_

    21 

    22 // System includes

    23 #include <e32std.h>

    24 

    25 /** 

    26  * This flag controls whether helpers emits a double tap or a tap gesture 

    27  * for a second tap 

    28  */

    29 #define _GESTURE_DOUBLE_TAP_SUPPORT

    30 

    31 /**

    32  * XnGestureHelper namespace

    33  * Used for the whole gesture family - Gesture recognizer, gesture helper, 

    34  * Point array

    35  */

    36 namespace XnGestureHelper

    37     {

    38     /** time to hold the stylus in the same position to activate 

    39      * holding, in microseconds 

    40      */

    41     const TInt KHoldDuration = 500000; 

    42 

    43     /** 

    44      * time to tap again for the second tap to be a double tap, in 

    45      * microseconds 

    46      */

    47     const TInt KMaxDoubleTapDuration = 400000; 

    48 

    49     /** 

    50      * time in which speed becomes zero if user stops stylus movement before

    51      * lifting the pointer, in microseconds

    52      */ 

    53     const TInt KSpeedStopTime = 100000; 

    54 

    55     /** 

    56      * tolerance in degrees to either side of an angle, for direction to be 

    57      * the same as reference angle

    58      */

    59     const TReal KAngleTolerance = 80;

    60     

    61     /**  

    62      * maximum pointer movement from pointer down position for a gesture be 

    63      * a tap or hold gesture

    64      */

    65     const TInt KSamePointTolerance = 3;

    66     

    67     /** 

    68      * minimum length of a valid swipe in pixels. should be larger than 

    69      * KTapTolerance

    70      */

    71     const TReal KMinSwipeLength = 10;

    72     

    73     /** Nth pointer event before the latest point */

    74     const TInt KPreviousPointOffset = 3;

    75     

    76     

    77     /** 

    78      * Panic codes 

    79      */

    80     enum TGesturePanic

    81         {

    82         EGesturePanicIllegalLogic

    83         };

    84     

    85     /** 

    86      * Panics the thread 

    87      * 

    88      * @param aReason Panic reason

    89      */

    90     inline void Panic( TGesturePanic aReason )

    91         {

    92         _LIT( KComponentName, "XnGestureHelper" );

    93         User::Panic( KComponentName, aReason );

    94         }   

    95     } // namespace XnGestureHelper

    96 

    97 #endif // _XNGESTUREDEFS_H_